Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will with attached drawing and in detailNarration clearly illustrates the spirit of disclosed content, and any skilled artisan is understanding the content of present inventionAfter embodiment, when the technology that can be taught by the content of present invention, it is changed and modifies, without departing from the essence of the content of present inventionMind and range.
The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not as a limitation of the invention.In addition, in the drawings and embodiments the use of element/component of same or like label is for representing same or like portionPoint.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position,It is non-to limit the present invention, only for distinguish with same technique term description element or operation.
About direction term used herein, such as: upper and lower, left and right, front or rear etc. are only the sides with reference to attached drawingTo.Therefore, the direction term used is intended to be illustrative and not intended to limit this creation.
It is open term, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc.Mean including but not limited to.
About it is used herein " and/or ", including any of the things or all combination.
It include " two " and " two or more " about " multiple " herein；It include " two groups " about " multiple groups " hereinAnd " more than two ".
About term used herein " substantially ", " about " etc., to modify it is any can be with the quantity or mistake of microvariationsDifference, but this slight variations or error can't change its essence.In general, microvariations that such term is modified or errorRange in some embodiments can be 20%, in some embodiments can be 10%, can be in some embodiments 5% or itsHis numerical value.It will be understood by those skilled in the art that the aforementioned numerical value referred to can be adjusted according to actual demand, it is not limited thereto.
Fig. 1 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention providesThe composition schematic diagram of example one as shown in Figure 1, vehicle control unit controls high voltage power supply gives driving load supplying, and controls low tensionSource powers to vehicle low-voltage load, and also the high-voltage electricity of high voltage power supply is converted to low tension supply low tension by control electric pressure converterSource and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the DC voltage converting system for electric car includes full-vehicle controlDevice VCU1, high voltage power supply 2, low-tension supply 3 and electric pressure converter 4.Wherein, high voltage power supply 2 by electric pressure converter 4 with it is described wholeVehicle controller 1 connects, and high voltage power supply 2 is used to provide electric energy to driving load M；Low-tension supply 3 and the entire car controller 1 connectIt connects, low-tension supply 3 is used to provide electric energy to vehicle low-voltage load RL；Electric pressure converter 4 and the entire car controller 1, the heightVoltage source 2 and the low-tension supply 3 connect, and electric pressure converter 4 is for realizing the height under the control of the entire car controller 1Voltage source 2 provides electric energy for the low-tension supply 3 and/or the vehicle low-voltage load RL, specifically includes: in the point of electric carUnder fire switch closed state, when entire car controller 1 detects that low pressure baby battery 3 requires supplementation with electricity, entire car controller 1 is controlledThe not enabled output of DC/DC electric pressure converter 4 supplements electricity by low pressure baby battery 3 of constant voltage and current limiting mode；In the point of electric carUnder fire switch open state, it is whole that entire car controller 1, which controls DC/DC electric pressure converter 4 according to the enabled output of load power demand,Vehicle low-voltage load RL provides electric energy, and supplements electricity for low pressure baby battery 3；In the case where ignition switch is opened, and low pressureBaby battery 3 not power shortage when, DC/DC electric pressure converter 4 is whole with low pressure baby battery 3 according to the enabled output of load power demand simultaneouslyVehicle low-voltage load RL power supply.
In the embodiment of the present invention, electric pressure converter 4 can be DC/DC electric pressure converter, and DC/DC electric pressure converter can be withCarry out high-low voltage conversion；Low-tension supply 3 can be low pressure baby battery；Driving load M includes driving motor and interior air-conditioning etc.；Vehicle low-voltage load RL includes lighting system and sound system etc..
Referring to Fig. 1, electric pressure converter 4 converts the high voltage direct current of high voltage power supply 2 under the control of entire car controller 1Low-tension supply 3 and/or the vehicle low-voltage load RL are supplied for low-voltage DC, prevents electric car since long-time is placed,Since the self discharge of low pressure baby battery and vehicle low-voltage load RL (vehicle low-voltage load system) need to remember power supply and cause low pressure smallThe long-term power shortage of battery, the case where causing low pressure baby battery permanent damages generation changes existing equipment small, realizes simple, userExperience Degree is high.
Fig. 2 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention providesThe composition schematic diagram of example two, as shown in Fig. 2, a high-power connector is substituted using two output connectors being connected in parallel,The current density of connector is low, small in size, at low cost.
In the specific embodiment shown in the drawings, the DC voltage converting system for electric car further includes first defeatedConnector 5 and the second output connector 6 out.Wherein, the setting of the first output connector 5 is in the electric pressure converter 4 and described lowBetween voltage source 3；Second output connector 6 is connected in parallel with first output connector 5, the setting of the second output connector 6Between the electric pressure converter 4 and the low-tension supply 3.
Referring to fig. 2, sharp in the prior art since the output power of electric pressure converter 4 is larger (usual output power is 1KW)It is connected between electric pressure converter 4 and low-tension supply 3 with a high-power connector, due to the transmission electric current of high-power connectorGreatly, temperature increases, and technique is with high requirements and high cost, and is easily damaged；It is substituted with two output connectors being connected in parallel one bigPower connector, the current density of connector reduces, volume becomes smaller, and required technique also reduces, and consequent is costIt reduces, and is hardly damaged, long service life.
Fig. 3 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention providesThe composition schematic diagram of example three, as shown in figure 3, the ignition lock state of the data acquisition unit acquisition electric car of entire car controllerTurned with the control unit of the current voltage of low-tension supply, entire car controller according to ignition lock state and current voltage control voltageParallel operation provides electric energy for low-tension supply and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the entire car controller 1 includes that data acquisition unit 11 and control are singleMember 12.Wherein, data acquisition unit 11 is connect with the low-tension supply 3, and data acquisition unit 11 is for acquiring electric carThe temperature of ignition lock state information, the current voltage of the low-tension supply 3 and the electric pressure converter 4；Control unit 12It is connect with the electric pressure converter 4, control unit 12 is used for according to the ignition lock state information and the current voltage controlIt makes the electric pressure converter 4 and provides electric energy for the low-tension supply 3 and/or the vehicle low-voltage load RL.Implementation of the inventionIn example, the electric pressure converter 4 is DC/DC electric pressure converter；Data acquisition unit 11 is digital voltmeter；Control unit 12 isVehicle-mounted computer；The low-tension supply 3 is low pressure baby battery.It is described if the enabled control line C of the electric pressure converter is enabledElectric pressure converter exports electric energy according to load power demand, then when the enabled control line C of the electric pressure converter is not enabled, instituteIt states electric pressure converter and electric energy is exported in a manner of constant voltage and current limiting according to the state of low pressure baby battery.When electric car is in ignition switch shapeIn the case that state is opened, entire car controller 1 is issued to electric pressure converter 4 by enabled control line C and is instructed, and makes it according to load functionRate demand exports electric energy (for example, when enabled control line C is not enabled, output electric current is set as 35A ± 1A), and it is negative to meet vehicle low pressureCarry RL power consumption demand, reduce low pressure baby battery (low-tension supply) discharge current, make as far as possible low pressure baby battery do not discharge orFew electric discharge, makes battery capacity be in full power state, extends the service life of low pressure baby battery；When electric car is in ignition switch shapeIn the case that state is closed, when entire car controller 1 detects that electric car low pressure baby battery needs to mend by data acquisition unit 11When charge volume, vehicle control controller is issued to electric pressure converter 4 by enabled control line C and is instructed, and makes it in a manner of constant voltage and current limitingExport low current be low pressure baby battery supplement electricity (for example, when enabled control line C is not enabled, output voltage be 13.5V~13.8V, output electric current be 4A~6A), avoid low pressure baby battery from damaging due to normal phase power shortage, above-mentioned electric pressure converter 4 it is defeatedVoltage and output electric current are only reference data out, and user can according to need output voltage and the output of adjustment electric pressure converter 4Electric current, invention is not limited thereto.
Referring to Fig. 3, when the ignition switch of electric car is opened, entire car controller 1 controls electric pressure converter 4 according to loadPower demand exports electric energy, meets the power demand of vehicle low-voltage load RL, extends the service life of low-tension supply 3；In batteryWhen the ignition switch of automobile is closed, entire car controller 1 detects that the voltage of low-tension supply 3 is lower than threshold value, when requiring supplementation with electricity,Entire car controller 1 control electric pressure converter 4 using constant voltage and current limiting mode be low-tension supply 3 supplement electricity, avoid low-tension supply 3 due toLong-term power shortage and damage, extend the service life of low-tension supply 3.
Fig. 4 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention providesThe composition schematic diagram of example four, as shown in figure 4, can be configured when electric pressure converter has the function of CAN bus for entire car controllerCAN interface realizes the communication between entire car controller and electric pressure converter by CAN bus, instead of enabling the function of control line,Meets the needs of system function.
In the specific embodiment shown in the drawings, the entire car controller 1 further includes CAN interface 13.Wherein, CAN connectsMouth 13 is arranged between described control unit 12 and the electric pressure converter 4, and CAN interface 13 passes through for described control unit 12CAN bus L controls the electric pressure converter 4.
Referring to fig. 4, the communication between control unit 12 and electric pressure converter 4, compatible existing electricity are realized using CAN bus LThe communication mode of electrical automobile does not need to carry out protocol conversion to the communication data of existing electric car, realizes simple, cost of implementationIt is low.
Fig. 5 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention providesThe flow chart of the embodiment one of method, as shown in figure 5, state and low tension of the entire car controller according to electric car ignition switchThe high voltage electric energy of high voltage power supply is converted to low-voltage electric energy and is supplied to low-tension supply by the current voltage in source, control electric pressure converterAnd/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the control method packet of the DC voltage converting system for electric carIt includes:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.Reality of the inventionIt applies in example, ignition lock state information indicates that the state of ignition switch is specifically to open, or close.
Step 102: being described low according to the ignition lock state information and current voltage control electric pressure converterVoltage source and/or vehicle low-voltage load provide electric energy.In the embodiment of the present invention, ignition lock state information indicates ignition switchState be specifically open when, electric pressure converter provides electric energy for low-tension supply and vehicle low-voltage load；Ignition lock state letterBreath instruction ignition switch state be specifically close, and the current voltage of low-tension supply be lower than threshold value (voltage threshold) when, electricityPressure converter provides electric energy for vehicle low-voltage load.
Referring to Fig. 5, voltage is controlled according to the current voltage of the ignition switch state in which of electric car and low-tension supplyConverter provides electric energy for low-tension supply and/or vehicle low-voltage load, prevents the long-term power shortage of low-tension supply and damages.
Fig. 6 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention providesThe flow chart of the embodiment two of method, as shown in fig. 6, being controlled according to the current voltage of ignition lock state information and low-tension supplyElectric pressure converter provides electric energy for low-tension supply and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, step 102 is specifically included:
Step 1021: the open and-shut mode of ignition switch is judged according to the ignition lock state information.Implementation of the inventionIn example, ignition lock state information indicates the opening and closing of ignition switch.
Step 1022: when ignition lock state information instruction ignition switch is opened, controlling the electric pressure converterElectric energy, which is exported, according to load power demand provides electric energy to the low-tension supply and vehicle low-voltage load.The embodiment of the present inventionIn, when the electric pressure converter exports electric energy according to load power demand, the enabled control line of the electric pressure converter enables defeatedOut.If the enabled control line of electric pressure converter enables output, electric pressure converter exports electric energy according to load power demand, thatWhen the enabled control line of electric pressure converter is not enabled, electric pressure converter exports electric energy in a manner of constant voltage and current limiting.
Step 1023: when ignition lock state information instruction ignition switch is closed, further judging described currentWhether voltage is less than voltage threshold.
Step 1024: when the current voltage is less than the voltage threshold, controlling the electric pressure converter and limited with constant pressureStream mode provides electric energy to the low-tension supply.In the embodiment of the present invention, the electric pressure converter is defeated in a manner of constant voltage and current limitingOut when electric energy, the enabled control line of the electric pressure converter is not enabled.
Step 1025: when the current voltage is equal to the voltage threshold, controlling the electric pressure converter and stop as instituteIt states low-tension supply and the vehicle low-voltage load provides electric energy；When being less than the voltage threshold such as current voltage, the electricity is controlledPressure converter continues as the low-tension supply and the vehicle low-voltage load provides electric energy.
Step 1026: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stopOnly electric energy is provided for the low-tension supply and the vehicle low-voltage load.
Referring to Fig. 6, electric pressure converter is controlled according to the current voltage of the ignition lock state of electric car and low-tension supplyElectric energy is provided for low-tension supply and/or vehicle low-voltage load, solves electric car because of the placement for a long time of certain reasons, low tensionThe problem of source (low pressure baby battery) causes power shortage to damage after placing a period of time.
Specific embodiments of the present invention provide a kind of computer storage medium comprising computer executed instructions, the calculatingMachine executes instruction when handling via data processing equipment, which executes the controlling party of DC voltage converting systemMethod.Method the following steps are included:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.
Step 102: being described low according to the ignition lock state information and current voltage control electric pressure converterVoltage source and/or vehicle low-voltage load provide electric energy.
Specific embodiments of the present invention also provide a kind of computer storage medium comprising computer executed instructions, the meterCalculation machine executes instruction when handling via data processing equipment, which executes the controlling party of DC voltage converting systemMethod.Method the following steps are included:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.
Step 1021: the open and-shut mode of ignition switch is judged according to the ignition lock state information.
Step 1022: when ignition lock state information instruction ignition switch is opened, controlling the electric pressure converterElectric energy, which is exported, according to load power demand provides electric energy to the low-tension supply and vehicle low-voltage load.
Step 1023: when ignition lock state information instruction ignition switch is closed, further judging described currentWhether voltage is less than voltage threshold.
Step 1024: when the current voltage is less than the voltage threshold, controlling the electric pressure converter and limited with constant pressureStream mode provides electric energy to the low-tension supply.
Step 1025: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stopOnly electric energy is provided for the low-tension supply and the vehicle low-voltage load；When being less than the voltage threshold such as current voltage, controlThe electric pressure converter continues as the low-tension supply and the vehicle low-voltage load provides electric energy.
Step 1026: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stopOnly electric energy is provided for the low-tension supply and the vehicle low-voltage load.
The specific embodiment of the invention provides a kind of for the DC voltage converting system and its control method of electric car, JieMatter, in the state that the ignition switch of electric car is opened, entire car controller (VCU) controls DC/DC electric pressure converter according to negativePower demand output electric energy (can full power output) is carried, while giving low pressure baby battery electric energy supplement, meets vehicle low-voltage loadPower demand, extend low pressure baby battery service life；Under the ignition switch closed state of battery car, entire car controllerWhen detecting that low pressure baby battery requires supplementation with electricity, vehicle control unit controls DC/DC electric pressure converter is in a manner of constant voltage and current limitingLow pressure baby battery supplements electricity；Under the ignition switch open state of battery car, the conversion of vehicle control unit controls DC/DC voltageDevice provides electric energy according to load power demand for vehicle low-voltage load, and supplements electricity for low pressure baby battery, prevents the small electricity of low pressurePond is damaged due to long-term power shortage.The output connector being connected in parallel using two substitutes original high-power connector, both dropsLow process costs, and improve the service life of DC/DC electric pressure converter.
The above-mentioned embodiment of the present invention can be implemented in various hardware, Software Coding or both combination.For example, this hairBright embodiment can also be the execution above method in data signal processor (Digital Signal Processor, DSP)Program code.The present invention can also refer to computer processor, digital signal processor, microprocessor or field-programmable gate arrayArrange the multiple functions that (Field Programmable Gate Array, FPGA) is executed.Above-mentioned processing can be configured according to the present inventionDevice executes particular task, and machine-readable software code or the firmware generation of the ad hoc approach that the present invention discloses are defined by executingCode is completed.Software code or firmware code can be developed as different program languages and different formats or form.Can also beDifferent target platform composing software codes.However, executing software code and the other types configuration generation of task according to the present inventionDifferent code pattern, type and the language of code do not depart from spirit and scope of the invention.
The foregoing is merely the schematical specific embodiments of the present invention, before not departing from conceptions and principles of the inventionIt puts, the equivalent changes and modifications that any those skilled in the art is made should belong to the scope of protection of the invention.