US20020123833A1 - Vehicle diagnostic system - Google Patents

Abstract

The present invention provides a vehicle diagnostic system comprising an electronic control unit for controlling and monitoring vehicle equipment, a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between the vehicle and the telecommunication equipment located outside the vehicle and for transmitting a communication diagnostic signal to the electronic control unit and receiving a response signal to the communication diagnostic signal, and a communication line for connecting the electronic control unit and the radio communication means wherein the response signal is utilized to determine if the communication line is properly functional.

Description

FIELD OF THE INVENTION
• The present invention relates to a diagnostic system in a vehicle such as an automobile, and more specifically, to a vehicle diagnostic system that transmits a diagnostic information or signal of a vehicle by means of radio communication.[0001]
DISCUSSION OF THE RELATED ART
• Vehicle diagnosis pertains to self-diagnosis of an abnormality of an engine, a transmission, and the like. The OBD II (On-Board Diagnosis II) system of the United States is one example of this vehicle diagnostic system. The system is particularly suited to detecting deterioration in exhaust emissions using an engine electronic control unit, and then notifying the vehicle user of the failure. The diagnostic information at this time is stored in a memory in the engine ECU as a code corresponding to the failure. The diagnostic information can be read by connecting an external scan tool to the engine ECU via a diagnosis connector at a repair shop. In the repair shop, repair in response to the failure code is performed.[0002]
• Currently, for reducing diagnostic costs and shortening a period from failure to repair, an OBD III system, which is a system further developed from the OBD II system, is being reviewed by the California atmospheric resource bureau in the United States. The OBD III system is characterized in that a monitor station, base station (collectively refer to as “telecommunication equipment”) and the like, automatically collects diagnostic information radio-transmitted from each vehicle. In this regard, the integrity of the diagnostic information becomes crucial. Unfortunately, either through vehicle operator's manipulation or diagnostic system failure, the diagnostic information is not always accurate.[0003]
• Conventionally, a mechanism to judge whether or not vehicle diagnostic information is correctly transmitted toward a telecommunication equipment is both costly and unreliable due to the numerous components necessitated by previous systems.[0004]
SUMMARY OF THE INVENTION
• The present invention provides a vehicle diagnostic system capable of transmitting diagnostic information or signal of a vehicle to outside of the vehicle by means of radio communication like OBD III, detecting abnormality of the vehicle diagnostic system, which is caused by a failure of the vehicle diagnostic system itself or by manipulation of a vehicle operator and notifying the vehicle operator and/or a telecommunication equipment about the abnormality of the vehicle diagnostic system. In addition, the present invention provides a vehicle diagnostic system at low cost without newly adding a dedicated radio communication means for transmitting diagnostic information or signal of a vehicle to a telecommunication equipment by means of radio communication. In this way, it becomes possible to produce vehicles, which support OBD III, and the like, while minimizing costs.[0005]
• In an object of the present invention a vehicle diagnostic system is provided comprising an electronic control unit for controlling and monitoring vehicle equipment, a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between the vehicle and the telecommunication equipment located outside the vehicle and for transmitting a communication diagnostic signal to the electronic control unit and receiving a response signal to the communication diagnostic signal, and a communication line for connecting the electronic control unit and the radio communication means wherein the response signal is utilized to determine if the communication line is properly functional.[0006]
• In another object of the present invention a vehicle diagnostic system is provided comprising an electronic control unit for controlling and monitoring vehicle equipment, a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between the vehicle and the telecommunication equipment located outside the vehicle, and a communication line for connecting the electronic control unit and the radio communication means; wherein the transmitted vehicle diagnostic information is returned back to the radio communication means by the telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in the electronic control unit to determine if the radio communication means is properly functional.[0007]
• In yet another object of the present invention a vehicle diagnostic system is provided comprising an electronic control unit for controlling and monitoring vehicle equipment, a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between the vehicle and the telecommunication equipment located outside the vehicle, and a communication line for connecting the electronic control unit and the radio communication means; wherein the radio communication means transmits or receives information other than the vehicle diagnostic information.[0008]
BRIEF DESCRIPTION OF THE DRAWINGS
• The above advantages and features of the invention will be more clearly understood from the following detailed description which is provided in connection with the accompanying drawings.[0009]
• FIG. 1 illustrates a vehicle diagnostic system according to the first embodiment of the present invention;[0010]
• FIG. 2 illustrates a vehicle diagnostic system according to the second embodiment of the present invention;[0011]
• FIG. 3 illustrates a vehicle diagnostic system according to the third embodiment of the present invention;[0012]
• FIG. 4 illustrates a vehicle diagnostic system according to the fourth embodiment of the present invention;[0013]
• FIG. 5 is a block diagram for stopping an engine in a case where a vehicle user does not carry out repair or improvement within a predetermined period of time in the vehicle diagnostic system of FIG. 4;[0014]
• FIG. 6 illustrates a vehicle diagnostic system according to the fifth embodiment of the present invention;[0015]
• FIG. 7 illustrates a vehicle diagnostic system according to the sixth embodiment of the present invention;[0016]
• FIG. 8 illustrates a vehicle diagnostic system according to the seventh embodiment of the present invention;[0017]
• FIG. 9 illustrates a vehicle diagnostic system according to the eighth embodiment of the present invention;[0018]
• FIG. 10 illustrates a vehicle diagnostic system according to the ninth embodiment of the present invention;[0019]
• FIG. 11 illustrates a vehicle diagnostic system according to the tenth embodiment of the present invention;[0020]
• FIG. 12 illustrates a vehicle diagnostic system according to the eleventh embodiment of the present invention;[0021]
• FIG. 13 is a schematic diagram illustrating a vehicle which is equipped with the vehicle diagnostic system of FIG. 9;[0022]
• FIG. 14 illustrates a vehicle diagnostic system according to the twelfth embodiment of the present invention;[0023]
• FIG. 15 is a schematic diagram illustrating a vehicle which is equipped with the vehicle diagnostic system of FIG. 14;[0024]
• FIG. 16 illustrates a vehicle diagnostic system according to the thirteenth embodiment of the present invention;[0025]
• FIG. 17 is a schematic diagram illustrating a vehicle which is equipped with the vehicle diagnostic system of FIG. 16; and[0026]
• FIG. 18 is a schematic diagram in which vehicle diagnostic information is transmitted from a vehicle, which is equipped with a vehicle diagnostic system of the present invention for performing short-distance communication to a base station, a monitor station, or the like.[0027]
DETAILED DESCRIPTION OF THE INVENTION
• Exemplary embodiment of the present invention will be described below in connection with the drawings. Other embodiments may be utilized and structural or logical changes may be made without departing from the spirit or scope of the present invention. Like items are referred to by like reference numerals throughout the drawings.[0028]
• Referring now to the drawings, the vehicle[0029]diagnostic system1 of FIG. 1 comprises anelectronic control unit2, a radio communication means3, and aserial communication line4 that is connected between theelectronic control unit2 and the radio communication means3. In this case, an electronic control unit is a control unit that controls various kinds of vehicle equipment including an engine, an automatic transmission, and a break, and that diagnoses the vehicle equipment. The radio communication means is a device that has a radio transmission circuit and/or a radio receiving circuit, and an antenna.
• In the[0030]electronic control unit2, signals ofvarious sensors28 are inputted to an I/O15 of amicrocomputer10 via aninput circuit11 and in response to the input signals, aCPU17 of themicrocomputer10 performs an operation according to a control program that is stored in aROM18. Then, the most appropriate signal is transmitted to anoutput driver12 via the I/O15 and theoutput driver12 drivesvarious actuators29.
• Here, while a vehicle is traveling, the[0031]microcomputer10 of theelectronic control unit2 controls the vehicle equipment as described above. At this time, themicrocomputer10 also diagnoses a state of the vehicle equipment according to information obtained from diagnostic signals in relation to states of thevarious sensors28 and states of theactuators29 of theoutput driver12, and stores the diagnostic information in aRAM19 as a code corresponding to a diagnostic result. When a failure occurs, themicrocomputer10 lights up awarning lamp27 to inform a vehicle user that the failure has occurred, and to request the vehicle user to carry out repairs. Then, themicrocomputer10 transmits vehicle diagnostic information D, which is the diagnostic information of the vehicle equipment stored in theRAM19, to the radio communication means3 through theserial communication line4.
• The radio communication means[0032]3 modulates by the frequency the vehicle diagnostic information D using a radio transmitting/receivingcircuit33, and then radio-transmits the modulated vehicle diagnostic information D as a diagnostic information signal from anantenna34 to telecommunication equipment or a base station6 (hereinafter referred to as telecommunication equipment).
• In this manner, when a failure occurs in the vehicle equipment, a status of the vehicle equipment, which has been diagnosed by the[0033]electronic control unit2, can be radio-transmitted to thetelecommunication equipment6 as diagnostic information of the vehicle equipment. The diagnostic information of the vehicle equipment includes means the diagnostic code and a vehicle code (VIN) specific to each vehicle.
• In this connection, not only in a case where a failure occurs in the vehicle equipment as described in this embodiment, but also in a state in which there is no failure, the diagnostic information may be always radio-transmitted to the[0034]telecommunication equipment6 at certain time intervals. In addition, when receiving a diagnostic information request signal of thetelecommunication equipment6 as a radio signal, said diagnostic information may be radio-transmitted to thetelecommunication equipment6 in response to this request. Unless otherwise specified, each embodiment is described assuming that said diagnostic information is automatically transmitted when a failure occurs in the vehicle equipment.
• The vehicle[0035]diagnostic system1 of this embodiment has a function of checking whether or not communication between the radio communication means3 and theelectronic control unit2 is being performed normally. Specifically, the radio communication means3 transmits a communication diagnostic signal Q to theelectronic control unit2 as necessary and in response to it, theelectronic control unit2 sends back a response signal A to the radio communication means3. Then, the radio communication means3 decrypts or utilizes this response signal A and determines whether or not the communication is being performed normally. In other words, whether thecommunication line4 is properly functional.
• As the communication diagnostic signal Q, for example, an instruction for performing an operation of a plurality of numerical values appropriately, a different rolling code for each transmission, and the like, may be used. In the case of the former, the[0036]electronic control unit2 performs a specified operation. In the case of the latter theelectronic control unit2 searches an appropriate code from among a plurality of codes stored in anEEPROM14, and sends the code back to the radio communication means3. Next, the radio communication means3 determines normality or abnormality of the communication by comparing the code with a fixed value stored in amemory32. If the radio communication means3 judges that the communication is not being performed normally, the radio communication means3 lights up a warning lamp, or takes other actions, in order to warn the vehicle user of abnormality of the vehicle diagnostic system and thereby requests the vehicle user or operator to repair the vehicle diagnostic system and at the same time, the radio communication means3 also reports to thetelecommunication equipment6.
• Referring now to FIG. 2, it is assumed that the[0037]electronic control unit2 is an engine ECU for controlling fuel injection, ignition, and the like, of a vehicle's engine. The vehicle diagnostic system is configured to carry out a function of stopping the engine to prevent undue influence in the event that communication between the radio communication means3 and thisengine ECU2 is not normally performed.
• The[0038]engine ECU2 inputs signals from aengine speed sensor21 for measuring an engine speed, anair flow sensor22 for measuring a quantity of intake air into the engine, a knockingsensor23 for detecting flame-out of the engine, anoxygen sensor24 for measuring oxygen concentration in exhaust gasses, and the like, to the I/O15 of themicrocomputer10 via theinput circuit11. In response to the input signals, theCPU17 of themicrocomputer10 performs an operation according to a control program that is stored in theROM18. Then, theCPU17 transmits the most appropriate control signal to theoutput driver12 via the I/O15. After that, thisoutput driver12 drives aninjector25 and anigniter26, and the like, which are actuators.
• In this case, concerning a method for transmitting the vehicle diagnostic information D to the telecommunication equipment outside[0039]vehicle6 in the event of a failure in the vehicle equipment is the same as that described in the first embodiment. Additionally, in this embodiment, an ignition switch (IGN SW) signal, which notifies the radio communication means3 of ON or OFF of an ignition key, is inputted. When this ignition key becomes ON, transmitting an engine-operation enable signal E to theengine ECU2 by the radio communication means3 permits the engine to start. Also, the above-mentioned rolling code may be used as the engine-operation enable signal E. In this case, theengine ECU2 compares the transmitted code with an appropriate code from among a plurality of codes stored in theEEPROM14. As a result of the comparison, only when both codes are the same, theengine ECU2 drives theinjector25 and theigniter26 to start the engine.
• Beyond the method for inputting the ignition switch (IGN SW) signal to the radio communication means[0040]3, as shown in the third embodiment of FIG. 3, after starting the engine, theengine ECU2 transmits an engine-operation enable request signal EQ to the radio communication means3 and continues the engine operation by receiving an engine-operation enable signal E from the radio communication means3. In this case, after transmitting the engine-operation enable request signal EQ, if the engine-operation enable signal E is not returned within a predetermined period of time, the engine is stopped. In addition, transmitting an engine-operation disable signal to theengine ECU2 by the radio communication means3 may also disable the vehicle from traveling.
• In FIG. 4, if a failure of the vehicle equipment occurs, the[0041]electronic control unit2 stores vehicle diagnostic information D in theRAM19, and transmits the vehicle diagnostic information D to the radio communication means3. Then, the radio communication means3 radio-transmits vehicle diagnostic information D1 to thetelecommunication equipment6. When receiving the diagnostic information D1, thetelecommunication equipment6 sends vehicle diagnostic information D1, which is the same as the received diagnostic information D1, back to the radio communication means3 of the vehicle.
• The radio communication means[0042]3 transmits the diagnostic information to theelectronic control unit2. After that, theelectronic control unit2 compares diagnostic information D2, which has been transmitted, with the transmitted diagnostic information, in other words, with the vehicle diagnostic information D stored in theRAM19 to check whether or not the radio communication means3 is properly functional.
• Also, even if communication between the[0043]electronic control unit2 and the radio communication means3 is not normal due to a breakage of theserial communication line4, or the like, it is judged that the radio communication means3 is abnormal. Hence, whether or not the communication between theelectronic control unit2 and the radio communication means3 is being performed normally, is checked by using for the communication diagnostic signal Q and the response signal A as described in the first embodiment.
• In this embodiment, in the event of a failure in the[0044]antenna34, if theantenna34 is removed on purpose, if shielding theantenna34 causes the communication to become disabled, or if data is overwritten when transmitting the data to thetelecommunication equipment6, then the diagnostic information D2 is not received within a predetermined period of time, or the diagnostic information D is varied from the diagnostic information D2. As a result, theelectronic control unit2 judges that the radio communication means3 is abnormal. Theelectronic control unit2, therefore, warns the vehicle user of abnormality of the vehicle diagnostic system by lighting up the warninglamp27, and thereby requests the vehicle user to repair the vehicle diagnostic system.
• Here, as opposed to the first embodiment, if a failure occurs in the radio communication means[0045]3, the failure cannot be reported to thetelecommunication equipment6. Hence, even a defective vehicle is continuously allowed to travel without penalty and the like. FIG. 5 shows an embodiment configured to prevent this problem from occurring.
• In FIG. 5, if the[0046]CPU17 in themicrocomputer10 of theelectronic control unit2 judges that a failure has occurred in the vehicle equipment, theCPU17 sets a flag of a vehicle-equipment failure flag setting means63 to 1 (high signal), and at the same time lights up the warninglamp27. Acomparator62 compares the diagnostic information D, which is stored in theRAM19, with the diagnostic information D2 that has been sent back from thetelecommunication equipment6, as described above. Only if D is equivalent to D2, thecomparator62 clears the flag of the vehicle-equipment failure flag setting means63 so that the flag becomes 0 (low signal). On the other hand, if D is not equivalent to D2, or if D2 is not returned within a predetermined period of time, the flag of the vehicle-equipment failure flag setting means63 is kept as 1. Moreover, an IGN-ON counter60 counts a number of times engine starts t by monitoring the ignition switch (IGN SW) signal that indicates ON or OFF of the ignition key. Thecomparator61 judges whether or not the number of times engine starts t has exceeded a given value n. If the number exceeds the given value, thecomparator61outputs 1.
• After that, if the flag of the vehicle-equipment failure flag setting means[0047]63 is 1, and if thecomparator61 judges that the number of times engine starts t has exceeded the given value n, aNAND circuit64outputs 0. Then, this output signal E is inputted to an enable terminal of theoutput driver12 that drives theactuators29 such as theinjector25 and theigniter26. As a result, theoutput driver12 is always OFF, which stops the engine disabling the vehicle from traveling. Also, if a polarity of the enable terminal of theoutput driver12 is reverse, an ANDcircuits64 is used.
• In this manner, the engine can be stopped if the vehicle user does not carry out repair or improvement in a given period of time that has elapsed since the failure of the vehicle equipment occurred. Although this embodiment is adapted to the case where abnormality of the radio communication means[0048]3 continues, it is also possible to configure the radio communication means3 to have the function of this embodiment so as to stop the engine in a similar manner if the state, in which communication between theelectronic control unit2 and the radio communication means3 is not normal, continues.
• Hence, according to the first and the fourth embodiment, it is possible to detect a failure or abnormality of the vehicle diagnostic system like OBD III, which transmits diagnostic information of the vehicle equipment by radio communication, by checking whether or not communication between the[0049]electronic control unit2 and the radio communication means3 is being performed normally, or by checking whether or not the radio communication means3 is normal.
• In addition, according to the second, the third, and the fourth embodiment, it is possible to prevent the engine from starting to disable the vehicle from traveling if the vehicle user refuses to transmit the diagnostic information of the vehicle equipment in spite of a failure in the vehicle equipment or destroys the vehicle diagnostic system purposely. For example, if the operator causes undue influence, such as breaking the communication line between the[0050]electronic control unit2 and the radio communication means3 or removing or shielding theantenna34 of the radio communication means3 or overwriting the diagnostic information of the vehicle equipment.
• In this manner, according to these embodiment, it is possible to identify a vehicle, which increases exhaust emission in exhaust gasses, without fail in order to request the vehicle user to repair the vehicle at an early stage, and in order to disable the vehicle, for which the fraud is carried out, from traveling. Hence, air environmental protection, which is the purpose of the vehicle diagnostic system like OBD III, can be achieved. Also, the embodiments of the present invention does not require the addition of special hardware for detecting a failure or abnormality of the vehicle diagnostic system. Therefore, the above-mentioned effects can be achieved at a low cost. Moreover, as shown in the fourth embodiment, the[0051]communication line4 between theelectronic control unit2 and the radio communication means3 is used for checking whether or not diagnostic information transmitted from theelectronic control unit2 is correctly transmitted to thetelecommunication equipment6. Hecne, regardless of installed locations of the electronic control unit and the radio communication means, a failure and abnormality of the radio communication means can be detected.
• In FIG. 6, as the radio communication means[0052]3, this embodiment uses a radio communication means contained in on-vehicle information equipment. In FIG. 6, an on-vehicle information terminal70 and anemergency notification device71 in a driver's seat area exchangesinformation1 other than diagnostic information of the vehicle equipment with thetelecommunication equipment6 located at the service center, or the like, through the radio communication means3. For example, when a driver wants to look for a restaurant near from a location where the driver is now traveling, a map to the restaurant is displayed on-screen of the on-vehicle information terminal70 by requesting thetelecommunication equipment6 at the service center or the like, to provide the information. In addition, in case of emergency including a failure causing an accident or affecting vehicle's traveling or a health condition of the driver, the driver can send a request for help to the telecommunication equipment outsidevehicle6 at the service center, or the like, by pressing a button of theemergency notification device71.
• In this embodiment, the radio communication means[0053]3 contained in such existing on-vehicle information equipment is connected with theelectronic control unit2, and vehicle diagnostic information D of the vehicle equipment at the time of the failure is transmitted from this radio communication means3 to thetelecommunication equipment6. In this connection, the vehicle diagnostic information D may be transmitted to the radio communication means3 through the on-vehicle information terminal70.
• In addition, the radio communication means[0054]3 transmits a communication diagnostic signal Q to theelectronic control unit2 as necessary and in response to this signal, theelectronic control unit2 sends back a response signal A.
• In FIG. 7, vehicle diagnostic information is radio-transmitted to the[0055]telecommunication equipment6 using the radio communication means contained in the on-vehicle information equipment. However, communication between the electronic control unit and the radio communication means is performed by cable and by means of radio communication.
• Specificially, the[0056]engine ECU2, a first ECU (for example, ECU for air bag control)7, a second ECU (for example, ECU for transmission control)8, a short-distance radio transmit-receivedevice74 are connected each other through a control system LAN inside vehicle. For example, they are mutually connected through amultiple communication line4′ such as CAN (Controller Area Network). The short-distance radio transmit-receivedevice74 comprises a transmit-receivecontroller72 and a transmit-receivecircuit73.
• In addition, the radio communication means[0057]3 is mutually connected to the on-vehicle information terminal70, theemergency notification device71, and the like, through an information system LAN insidevehicle75, and exchanges the information I other than the diagnostic information of the vehicle equipment with the telecommunication equipment outsidevehicle6 at the service center, or the like, through the radio communication means3. The vehicle diagnostic information D from thevarious ECUs7 and8 is transmitted to the short-distance radio transmit-receivedevice74 through the control system LAN insidevehicle4′. Then, the vehicle diagnostic information D is radio-transmitted from the short-distance radio transmit-receivedevice74 to the radio transmission means3. After that, the radio transmission means3 radio-transmits the diagnostic information, which has been transmitted, to thetelecommunication equipment6. As the short-distance radio transmit-receivedevice74, for example, a Bluetooth module, and the like, may be used.
• On the other hand, as the radio communication means, as shown in the seventh embodiment of FIG. 8, not the radio communication means contained in the vehicle information equipment, but the radio communication means[0058]3 contained in acellular phone76 may be used. In this case, it is required to connect the short-distance radio transmit-receivedevice74 not only to thecontrol system LAN4′ but also to theinformation system LAN75 to perform communication with thecellular phones76. However, only one short-distance radio transmit-receivedevice74 is sufficient if one LAN inside vehicle is constructed by connecting between thecontrol system LAN4′ and theinformation system LAN75. Also, although it is not shown in the figure, as thecellular phone76, besides the radio communication means3 for communicating with the telecommunication equipment outsidevehicle6, the one in which the short-distance radio transmit-receive device is built into is used. In each of the sixth and the seventh embodiment, as described in the first embodiment, there is a function of checking whether or not communication between each electronic control unit and the radio communication means is normal.
• In addition to the effects described in from the first to the fourth embodiment, all of the embodiments have an effect of constructing a vehicle diagnostic system, which transmits the diagnostic information of the vehicle equipment to outside of the vehicle by means of radio communication such as OBD III, at low cost. That is because the existing radio communication means in the vehicle is used for radio transmission of the diagnostic information of the vehicle equipment, and thereby the line used for information other than the diagnostic information is also used for the diagnostic information as the same hardware, which eliminates the need for a new radio communication means.[0059]
• Moreover, for the purpose of reducing vehicle assembly man-hour and reducing cost and weight of a signal harness, the electronic control unit is installed not in a conventional driver's seat area but in a location near from the vehicle equipment, which is controlled and diagnosed. In other words, the electronic control unit is installed in the engine room. But, the radio communication means of the on-vehicle information equipment is generally installed in the driver's seat area. Hence, even if the short-distance radio transmit-receive device is built into the electronic control unit, it was difficult to perform radio communication with the radio communication means in the driver's seat area, which conventionally required a communication line between the electronic control unit and the radio communication means. However, in the sixth and the seventh embodiment, it is possible to eliminate the need for the communication line between the electronic control unit and the radio communication means by installing the short-distance radio transmit-receive device, which is connected to the control system LAN, in the driver's seat area.[0060]
• In FIG. 9, it is assumed that an antitheft control unit for vehicle (hereinafter referred to as immobilizer ECU) or a control unit for keyless engine starting is used as the radio communication means for transmitting the vehicle diagnostic information. This embodiment is described in detail by exemplifying the immobilizer ECU as the radio communication means as below.[0061]
• The[0062]immobilizer ECU77 receives a radio signal C of an ID code specific to each vehicle, which is transmitted from atransmitter35 of anignition key5, through theantenna34. Theimmobilizer ECU77 then demodulates this received signal by the radio transmitting/receivingcircuit33, and compares the demodulated signal with a collation code stored in amemory32 using themicrocomputer30. If the transmitted ID code is the same as the collation code, theimmobilizer ECU77 transmits an engine-operation enable signal E to theengine ECU2 through aserial communication circuit31. This engine-operation enable signal E differs at each engine starting. When receiving this signal via theserial communication circuit13, anengine ECU2 compares the signal with a corresponding code from among a plurality of codes stored in theEEPROM14. As a result of the comparison, only if both are the same, theinjector25 and theigniter26 are driven to start the engine.
• While the vehicle is traveling, the[0063]engine ECU2 controls the vehicle equipment as described above, diagnoses a state of the vehicle equipment according to signals obtained from sensors such as the knockingsensor23 and theoxygen sensor24, and then stores diagnostic information of this vehicle equipment in theRAM19 as a code corresponding to the diagnostic result.
• When a failure occurs in the vehicle equipment, the[0064]engine ECU2 lights up the warninglamp27 to inform the operator that the failure has occurred, and thereby requests the operator to carry out repairs. Then, theengine ECU2 transmits the vehicle diagnostic information D, which is stored in theRAM19, to theimmobilizer ECU77 through theserial communication line4. Theimmobilizer ECU77 high-frequency-modulates the diagnostic information D using the radio transmitting/receivingcircuit33 and radio-transmits the diagnostic information D from theantenna34 to the telecommunication equipment outsidevehicle6 as a diagnostic information signal.
• Also, by building the immobilizer system, which is shown in this embodiment, into the on-vehicle information equipment shown in the fifth embodiment, the ID code from the ignition key may be received using the radio communication means contained in this on-vehicle information equipment.[0065]
• In FIG. 10, an antenna connected to the[0066]immobilizer ECU77 is a transmit-receive coil in a key cylinder. If there is an antenna inside this key cylinder, radio transmission and reception with outside of the vehicle is difficult. Therefore, radio communication with outside of the vehicle is performed using theignition key5 as the radio communication means3.
• In this[0067]ignition key5, a radio transmit-receivechip35′ is embedded. As is the case with the eighth embodiment, when the engine starts, theignition key5 transmits the ID code C to the transmit-receivecoil36. In addition, in the event that a failure occurs in the vehicle equipment, thisignition key5 receives the diagnostic information D, which is stored in theRAM19 of theengine ECU2, from the transmit-receivecoil36. Next, thisignition key5 radio-transmits the diagnostic information D to the telecommunication equipment outsidevehicle6.
• In FIG. 11, the[0068]engine ECU2, a first ECU7 (for example, ECU for controlling an air bag), a second ECU8 (for example, ECU for controlling transmission), and the millimeter-wave radar transmit-receivedevice78 are mutually connected through the control system LAN inside vehicle. For example, they are connected through themultiple communication line4′ such as the CAN. The millimeter-wave radar transmit-receivedevice78 comprises a transmit-receivecontroller37 and amillimeter wave radar38, and is used for an automatic follow-up traveling system of a vehicle, and the like.
• The[0069]millimeter wave radar38 transmits a detection wave R1 toward a vehicle traveling ahead, which is not shown in the figure and receives a reflection wave R2 from this vehicle. Moreover, when using the millimeter-wave radar transmit-receivedevice78 as a vehicle diagnostic system, in the event of a failure of the vehicle equipment, the diagnostic information D stored in theengine ECU2 is transmitted from themillimeter wave radar38 to thetelecommunication equipment6 via the radio communication means3 that is contained in the millimeter-wave radar transmit-receivedevice78.
• In FIG. 12, a vehicle diagnostic system that radio-transmits diagnostic information of a vehicle by connecting, for example, to a[0070]scan tool50, which is already provided in the OBD II-ready vehicle, to the radio communication means3 comprising a connector capable of fitting with thisconnector50.
• Configurations of the[0071]engine ECU2 and the radio communication means3, a method for transmitting diagnostic information of vehicle equipment, a method for checking whether or not communication between theengine ECU2 and the radio communication means3 are properly functional are the same as the first embodiment.
• According to the eighth and the ninth embodiment, as is the case with the second, the third, and the fourth embodiment, the vehicle user may refuse to transmit diagnostic information of the vehicle equipment in spite of a failure in the vehicle equipment and break or remodel the vehicle diagnostic purposely. For example, if the operator carries causes undue influence, for example, breaking a communication line between the electronic control unit and the radio communication means, or removing or shielding the antenna of the radio communication means, it is possible to prevent the engine from starting to disable the vehicle from traveling. For example, in the eighth embodiment, the[0072]antenna34, which is connected to theimmobilizer ECU77, also has a function of receiving the ID code C from theignition key5 in addition to a function of transmitting the diagnostic information D stored in theengine ECU2. Hence, if the user removes or shields theantenna34, it becomes impossible to start the engine. Moreover, even if the user breaks theserial communication line4, the engine-operation enable signal E is not sent to theengine ECU2, which also disables the engine from starting.
• In addition, using the existing communication line and the radio communication means in the vehicle, which are contained in an immobilizer system, a keyless engine starting system, and the like, eliminates the need for a new communication line and a radio communication means, and also eliminates the need for vehicle assembly man-hour for laying the new communication line. Therefore, it is possible to construct a vehicle diagnostic system, which transmits the diagnostic information of the vehicle equipment by means of radio communication such as OBD III, at low cost.[0073]
• In FIG. 13, the[0074]vehicle100 comprises anengine ECU2 mounted on theengine110, the immobilizer ECU or the control unit for keyless engine starting77, which has the radio communication means3, thecommunication line4 for connecting them, and theantenna34. FIG. 13 is an example showing that theantenna34 is mounted on a dashboard of thevehicle100, and that short distance communication with thetelecommunication equipment6 located on a road or a gas station is performed.
• In this manner, in the case of short distance communication, even an antenna having a low power output is sufficiently capable of communication. Therefore, the antenna of the existing immobilizer system or the antenna of the keyless engine starting system can be used as it is. In addition, because it is possible to miniaturize the radio transmit-receive[0075]chip35′ that is built into the ignition key in the ninth embodiment, transmission of the diagnostic information from theignition key5 also becomes possible.
• FIG. 14 shows a configuration of an[0076]engine ECU2 in a case where theengine ECU2 itself is provided with a radio communication means for radio-transmitting the diagnostic information of the vehicle equipment to outside of the vehicle. Besides a connector forharness42 for fitting with aconnector43 that is connected to various signal harnesses44, theengine ECU2 comprises a connector forantenna40 for fitting with aconnector41 that is connected to theantenna34. Additionally, theengine ECU2 is equipped with the radio transmitting/receivingcircuit33, which modulates or demodulates a radio transmit-receive signal of theantenna34 that is fitted with the connector forantenna40.
• In the event that a failure occurs in the vehicle equipment, or when receiving a diagnostic information request signal from the telecommunication equipment outside[0077]vehicle6, the diagnostic information D stored in theengine ECU2 is radio-transmitted to thetelecommunication equipment6 directly from theengine ECU2. Hence, in this embodiment, the radio transmitting/receivingcircuit33 is mounted on a substrate of theengine ECU2. However, a configuration, in which the radio transmitting/receivingcircuit33 is built into the antenna-side connector41 or built into the connector forantenna40 on the engine ECU side, is also possible. Moreover, a Bluetooth module for short distance radio communication, and the like, may also be used for the radio transmitting/receiving circuit.
• In addition, in this embodiment, by locating the engine ECU itself in an engine room, specifically, in the engine ECU where nobody can remove or access the engine ECU unless it is done in a repair shop, or the like, it becomes possible to prevent undue influence by the vehicle operator, an unfair practice including removal of the radio communication means installed in the engine ECU.[0078]
• Additionally, in this embodiment, because the engine ECU is provided with the radio communication means, the communication line, which connects between the engine ECU and the radio communication means, becomes unnecessary. In addition, from the viewpoint of implementation, configuring an antenna having a connector, or an antenna and a radio transmitting/receiving circuits separately from the engine ECU, as shown in this embodiment, permits the radio communication means to be attached to the engine ECU easily.[0079]
• FIG. 15 illustrates a[0080]vehicle100, having anantenna34 located on theengine ECU2 that is mounted on theengine110. A radio signal is transmitted to and received from the telecommunication equipment using thisantenna34. In this embodiment, for the purpose of reducing vehicle assembly man-hour and reducing cost and weight of a signal harness as described above, the engine ECU is installed not in the conventional driver's seat area but in the engine room. Hence, in FIG. 15, theantenna34 faces toward a road so as to perform short-distance communication. In this case, coaxial cable (a leakage)120, which is laid under a road, or in the vicinity of an oiling device of a gas station, or the like, may be used for radio communication equipment outsidevehicle6. Additionally, because of short-distance communication, even an antenna having a low power output is sufficiently capable of communication, which enables us to transmit the vehicle diagnostic information at low cost.
• FIG. 16 illustrates the use of a harness, which connects the engine ECU to the vehicle equipment, as an antenna. In this figure, the diagnostic information is radio-transmitted to the[0081]telecommunication equipment6 by: the radio transmitting/receivingcircuit33 of theengine ECU2 which modulates the diagnostic information D of the vehicle equipment, which has been transmitted by themicrocomputer10. Then the radio transmitting/receivingcircuit33 passes a high-frequency current through aharness45 as an antenna via a low-frequencysignal decoupling capacitor46. In addition, when receiving a signal, the radio transmitting/receivingcircuit33 demodulates a high-frequency current generated in theharness45. Thisharness45 is also used as a current path functioned when passing a current through asolenoid48 of anactuator111 via anoutput circuit12. However, because a frequency of the current for this load is sufficiently low as compared with a frequency of said high-frequency current, theharness45 can have both of an antenna function and the function of passing a current through the solenoid.
• In this connection, as shown in FIG. 16, providing a[0082]coil47 between a junction point (between the radio transmitting/receivingcircuit33 and the output circuits12) and theoutput circuits12 enables efficient radio transmission and reception without passing a high-frequency current to a battery and ground. Moreover, in this embodiment, although theharness45 connected to theoutput circuits12 is treated as an antenna, the harness connected to theinput circuit11 may also be used as an antenna. In this case, or if a load of theoutput circuits12 is not a coil, inserting the coil into an appropriate position of theharness45 enables efficient transmission and reception as described above.
• In addition, in this embodiment, as is the case with the twelfth embodiment, by locating the engine ECU itself in the engine room, specifically, in the engine ECU in a place where nobody can access it unless it is done in a repair shop, or the like, it becomes possible to prevent an undue influence including removal of the radio communication means installed in the engine ECU. In addition, for example, if harnesses, which input signals of an engine crank-angle sensor and a cam sensor, are used as antennas, breaking these harnesses prevents the engine from being properly controlled, which disables the vehicle from traveling.[0083]
• Furthermore, not only the communication line, which is connected between the engine ECU and the radio communication means, but also the antenna for transmitting the diagnostic information of the vehicle equipment becomes unnecessary. Therefore, it is possible to construct a vehicle diagnostic system, which transmits the diagnostic information of the vehicle equipment to outside of the vehicle by means of radio communication such as OBD III, at low cost.[0084]
• FIG. 17 illustrates a[0085]vehicle100 which transmits and receives a radio signal to and from thetelecommunication equipment6 using theharness45 that connects sensors or the actuator111 (such as for example an oxygen sensor, a heater for heating the oxygen sensor, and a solenoid for purging a canister) to theengine ECU2 mounted on theengine110. Because thisharness45 is located at a lower part of the vehicle, as is the case with FIG. 6, the leakagecoaxial cable120, which is laid under the road, or in the vicinity of the oiling device of the gas station, or the like, is used for theradio communication equipment6.
• Another embodiment is described with reference to FIG. 18. In this case, the vehicle diagnostic information is not transmitted directly to a base station, a monitor station, or the like by means of long-distance communication. As shown in FIG. 13, FIG. 15, or FIG. 17, the diagnostic information of the vehicle equipment is transmitted from the[0086]vehicle100, which is equipped with a vehicle diagnostic system that performs short-distance communication, to the base station, the monitor station, or the like.
• FIG. 18 shows a[0087]vehicle100 on the left side which is equipped with the vehicle diagnostic system according to the eighth embodiment shown in FIG. 9. Thevehicle100 radio-transmits the diagnostic information of the vehicle equipment to the telecommunication equipment outsidevehicle6 installed in a oilingmachine200.
• Further, a[0088]vehicle100′ on the right side is equipped with the vehicle diagnostic system according to the twelfth embodiment shown in FIG. 14. Thevehicle100′ radio-transmits the diagnostic information of the vehicle equipment to the leakagecoaxial cable120 that is laid under a road in the vicinity of the oilingmachine200, and which serves as thetelecommunication equipment6. In either case, as soon as a sensor, which is not shown in the figure, detects that thevehicle100 stopped in front of the oilingmachine200, or that oil supply is started, a diagnostic information request signal is transmitted from thetelecommunication equipment6 to thevehicle100. In response, transmission of the diagnostic information from thevehicle100 to thetelecommunication equipment6 is started. In this connection, only if there is a failure in the vehicle equipment, the diagnostic information may be transmitted from the vehicle side to the telecommunication equipment. Moreover, as regards the gas station, if no response is received from thevehicle100 in response to the diagnostic information request signal, which has been transmitted from the telecommunication equipment outsidevehicle6 to thevehicle100, due to an unfair practice such as removal of an antenna, it is possible to take measures such as stopping oil supply for example.
• Next, the diagnostic information of each[0089]vehicle100 is demodulated by a radio transmitting/receivingcircuit210 of thetelecommunication equipment6, and then transmitted to acomputer220 installed in a store, an office, or the like in the gas station. The diagnostic information of the vehicle equipment concerning eachvehicle100 collected in thiscomputer220 is transmitted to aserver240 in the base station, the monitor station, or the like, throughInternet230.
• According to the present invention, a vehicle diagnostic system comprises: an electronic control unit for controlling vehicle equipment and for diagnosing the vehicle equipment and a radio communication means comprising a radio transmission circuit and an antenna, for transmitting diagnostic information of the vehicle equipment to a radio communication equipment wherein a determination is made whether or not the communication between the electronic control unit and the radio communication means is being performed normally. Hence, it is possible to detect a failure of the vehicle diagnostic system itself or abnormality of the vehicle diagnostic system caused by a vehicle operator's undue influence and warn the vehicle operator or notify the abnormality of the vehicle diagnostic system to the telecommunication equipment.[0090]
• Moreover, using a vehicle's existing communication line or a vehicle's existing radio communication means, which is contained in on-vehicle information equipment, a vehicle antitheft system, a keyless engine starting system, a millimeter-wave radar transmit-receive device, and the like, eliminates the need for a communication line or a radio communication means, which is specifically intended for OBD III, or the like and also eliminates the need for vehicle assembly man-hour for laying the new communication line. Therefore, it is possible to construct a vehicle diagnostic system, which transmits the diagnostic information of the vehicle equipment to outside of the vehicle by means of radio communication such as OBD III at low cost. Furthermore, building the radio communication means into the electronic control unit, or connecting the radio communication means to an external scan-tool connector for reading the diagnostic information of the vehicle also eliminates the need for vehicle assembly man-hour for a new communication line and for laying the communication line. In addition, using a harness, which connects the electronic control unit to the vehicle equipment, as an antenna eliminates the need for adding an antenna.[0091]
• Although the invention has been described above in connection with exemplary embodiments, it is apparent that many modifications and substitutions can be made without departing from the spirit or scope of the invention. Accordingly, the invention is not to be considered as limited by the foregoing description, but is only limited by the scope of the appended claims.[0092]

Claims (58)

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. A vehicle diagnostic system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional.

2. The system ofclaim 1 wherein if said communication line is determined not to be properly functional a notification signal is transmitted to said telecommunication equipment located outside the vehicle by said radio communication means.

3. The system ofclaim 1 wherein said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional.

4. The system ofclaim 1 wherein if said communication line is determined not to be properly functional a notification signal is transmitted to a vehicle operator.

5. The system ofclaim 4 wherein if said communication line is determined not to be properly functional for a predetermined period of time said system disables said vehicle equipment from operation.

6. The system ofclaim 1 wherein said communication line signifies a serial communication line or a radio communication.

7. The system ofclaim 1 wherein said radio communication means transmits or receives information other than said vehicle diagnostic information.

8. The system ofclaim 7 wherein said radio communication means is included in an on-vehicle information equipment.

9. The system ofclaim 7 wherein said radio communication means is included in a cellular phone.

10. The system ofclaim 7 wherein said radio communication means is included in a vehicle anti-theft system.

11. The system ofclaim 10 wherein said vehicle anti-theft system utilizes an ignition key as said radio communication means.

12. The system ofclaim 7 wherein said radio communication means is included in a keyless engine starting system.

13. The system ofclaim 12 wherein said keyless engine starting system utilizes an ignition key as said radio communication means.

14. The system ofclaim 7 wherein said radio communication means is included in a radar device.

15. The system ofclaim 1 wherein said radio communication means is capable of connecting to an external scan-tool connector.

16. The system ofclaim 1 wherein a radio communication means is provided in an engine compartment of said vehicle.

17. The system ofclaim 1 wherein said system utilizes a harness which connects said electronic control unit to said vehicle equipment as an antenna for transmitting said vehicle diagnostic information.

18. The system ofclaim 1 wherein said telecommunication equipment is located on a road.

19. The system ofclaim 1 wherein said system complies with an On Board Diagnosis III system.

20. The system ofclaim 1 wherein said vehicle diagnostic information is transmitted through the internet.

21. A vehicle diagnostic system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional.

22. The system ofclaim 21 wherein if said radio communication means is determined not to be properly functional a notification signal is transmitted to a vehicle operator.

23. The system ofclaim 22 wherein if radio communication means is determined not to be properly functional for a predetermined period of time said system disables said vehicle equipment from operation.

24. The system ofclaim 21 wherein said communication line signifies a serial communication line or a radio communication.

25. The system ofclaim 21 wherein said radio communication means transmits or receives information other than said vehicle diagnostic information.

26. The system ofclaim 25 wherein said radio communication means is included in an on-vehicle information equipment.

27. The system ofclaim 25 wherein said radio communication means is included in a cellular phone.

28. The system ofclaim 25 wherein said radio communication means is included in a vehicle anti-theft system.

29. The system ofclaim 28 wherein said vehicle anti-theft system utilizes an ignition key as said radio communication means.

30. The system ofclaim 25 wherein said radio communication means is included in a keyless engine starting system.

31. The system ofclaim 30 wherein said keyless engine starting system utilizes an ignition key as said radio communication means.

32. The system ofclaim 25 wherein said radio communication means is included in a radar device.

33. The system ofclaim 21 wherein said radio communication means is capable of connecting to an external scan-tool connector.

34. The system ofclaim 21 wherein a radio communication means is provided in an engine compartment of said vehicle.

35. The system ofclaim 21 wherein said system utilizes a harness which connects said electronic control unit to said vehicle equipment as an antenna for transmitting said vehicle diagnostic information.

36. The system ofclaim 21 wherein said telecommunication equipment is located on a road.

37. The system ofclaim 21 wherein said system complies with an On Board Diagnosis III system.

38. The system ofclaim 21 wherein said vehicle diagnostic information is transmitted through the internet.

39. A vehicle diagnostic system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said radio communication means transmits or receives information other than said vehicle diagnostic information.

40. The system ofclaim 39 wherein said radio communication means is included in an on-vehicle information equipment.

41. The system ofclaim 39 wherein said radio communication means is included in a cellular phone.

42. The system ofclaim 39 wherein said radio communication means is included in a vehicle anti-theft system.

43. The system ofclaim 42 wherein said vehicle anti-theft system utilizes an ignition key as said radio communication means.

44. The system ofclaim 39 wherein said radio communication means is included in a keyless engine starting system.

45. The system ofclaim 44 wherein said keyless engine starting system utilizes an ignition key as said radio communication means.

46. The system ofclaim 39 wherein said radio communication means is included in a radar device.

47. The system ofclaim 39 wherein said system complies with an On Board Diagnosis III system.

48. The system ofclaim 39 wherein said vehicle diagnostic information is transmitted through the internet.

49. A vehicle diagnostic system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional; and

said radio communication means transmits or receives information other than said vehicle diagnostic information.

50. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional.

51. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional.

52. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said radio communication means transmits or receives information other than said vehicle diagnostic information.

53. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional;

wherein:

said radio communication means transmits or receives information other than said vehicle diagnostic information.

54. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional; and

said radio communication means transmits or receives information other than said vehicle diagnostic information.

55. A vehicle comprising a diagnostic system said system comprising:

an electronic control unit for controlling and monitoring vehicle equipment;

a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional; and

said radio communication means transmits or receives information other than said vehicle diagnostic information.

56. A method of diagnosing a vehicle comprising the steps of:

providing an electronic control unit for controlling and monitoring vehicle equipment;

providing a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle, and for transmitting a communication diagnostic signal to said electronic control unit and receiving a response signal to said communication diagnostic signal; and

providing a communication line for connecting said electronic control unit and said radio communication means wherein said response signal is utilized to determine if said communication line is properly functional.

57. A method of diagnosing a vehicle comprising the steps of:

providing an electronic control unit for controlling and monitoring vehicle equipment;

providing a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

providing a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said transmitted vehicle diagnostic information is returned back to said radio communication means by said telecommunication equipment located outside the vehicle and compared to the vehicle diagnostic information stored in said electronic control unit to determine if said radio communication means is properly functional.

58. A method of diagnosing a vehicle comprising the steps of:

providing an electronic control unit for controlling and monitoring vehicle equipment;

providing a radio communication means for transmitting a vehicle diagnostic information to a telecommunication equipment located outside the vehicle or for communicating between said vehicle and said telecommunication equipment located outside the vehicle; and

providing a communication line for connecting said electronic control unit and said radio communication means;

wherein:

said radio communication means transmits or receives information other than said vehicle diagnostic information.

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