Battery supplementing system and method for hybrid electric vehicleTechnical Field
The invention belongs to the technical field of energy management of hybrid electric vehicles, and particularly relates to a battery power supplementing system and method for a hybrid electric vehicle.
Background
The core technology of the hybrid electric vehicle is a general core technology of some vehicles such as a battery, a motor, an electric control, a chassis technology on the traditional vehicle and the like. The electrification and the intellectualization of automobiles have been increasing year by year, and the number of electronic and electric components has been at a high level. As advanced functions of the vehicle depend on electronic components, dark current of the vehicle in a non-operating state is also increasing. After some vehicles are parked for a period of time, the condition that the storage battery is insufficient and the engine cannot be started occurs. The driver does not know what level the state of health SOH of the battery is, and when the state of health SOH of the battery is at a low level, a situation in which the engine cannot be started easily occurs. In order to ensure starting performance and prolong chemical life of the power battery, the pure electric vehicle can prohibit the battery from being charged when the SOC of the power battery is lower, so that the vehicle cannot be started. The vehicle with the power supplementing function can be continuously awakened for detecting whether the storage battery is deficient or not, so that invalid awakening is caused, and the battery power of the vehicle is consumed.
In the prior art, some design schemes are made for the power supply and supplement of the hybrid electric vehicle. However, further research, the prior art still suffers from the following drawbacks or deficiencies:
(1) The health SOH of the battery of the hybrid electric vehicle is generally not directly known by the driver, and the driver does not know what level the health SOH of the battery is at, and when the health SOH of the battery is at a low level, the engine cannot be started easily.
(2) In order to ensure starting performance and prolong chemical life of a power battery, a hybrid electric vehicle generally prohibits discharging of the power battery when the SOC of the power battery is low, and cannot supplement electricity to the storage battery when the storage battery is deficient, so that the vehicle cannot be started.
(3) In the prior art, a vehicle with a power supplementing system can be continuously awakened for detecting whether the storage battery is deficient or not, so that invalid awakening is caused, the electric quantity of the automobile battery is consumed, and the electric quantity loss of the automobile battery is further increased.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a battery power supplementing system and method for a hybrid electric vehicle, wherein the power supplementing system utilizes a power battery to supplement power for the battery according to the SOC state of the power battery, the vehicle state and the use demands of a user when the electric quantity of the power battery is enough to supplement power to the outside. When the electric quantity of the power battery is insufficient and external electricity cannot be supplemented, the engine is started to supplement electricity for the high-voltage power battery and the storage battery according to the remote information confirmation of the user.
In order to achieve the above purpose, the invention discloses a battery power supply system of a hybrid electric vehicle, which comprises a battery power detection module EBS, a vehicle body controller BCM, a vehicle-mounted communication module T-BOX, a server, an engine controller ECM, a vehicle controller HCM, a power battery controller BMS, an ISG motor and a voltage converter DCDC; wherein,,
the vehicle control unit HCM is connected with the vehicle body controller BCM, the voltage converter DCDC, the ISG motor, the engine controller ECM, the vehicle-mounted communication module T-BOX and the power battery controller BMS;
the vehicle controller HCM is used for controlling the on-off of the high-voltage system and judging whether to start the engine, and the power battery controller BMS, the ISG motor, the voltage converter and the storage battery are respectively connected and used for converting the voltage of the power battery into the voltage capable of charging the storage battery;
the vehicle-mounted communication module T-BOX is used for sending a request for starting an engine and receiving a user instruction, and the engine controller ECM is used for controlling the operation of the engine.
Further, the line of sight of the battery power supply system of the hybrid electric vehicle according to claim 1 is applied, comprising the following steps:
and S100, periodically detecting the electric quantity and the voltage state of the storage battery by the storage battery EBS. When the set lower limit value of the power shortage is triggered, the EBS wakes up a vehicle body controller BCM;
s200, after the vehicle body controller BCM is awakened, the power shortage state of the storage battery is checked, then the whole vehicle controller HCM is awakened, and a power supply instruction is sent to the whole vehicle controller HCM. If the BCM records a command that a user refuses to start the engine to supplement electricity, the BCM cannot be awakened again by the battery EBS;
s300, after receiving a wake-up instruction of a vehicle body controller BCM, a whole vehicle controller HCM wakes up other parts on a high-voltage CAN network, including a power battery controller BMS, an ISG controller, a Motor controller, a distribution box PDM and a DCDC converter;
s400, after confirming that all the high-voltage network nodes send CAN messages, the whole vehicle controller HCM sends high-voltage power-on time sequence control signals according to the whole vehicle state of the vehicle, including but not limited to gears, vehicle speed, vehicle door opening and closing states, key opening and closing signals, fault grade signals and the like, and completes high-voltage power-on;
s500, the vehicle controller HCM judges whether the engine needs to be started or not according to the SOC state value sent by the power battery controller BMS. When the SOC value of the power battery is larger than the set lower output limit, the state of the vehicle is maintained unchanged, and the electric quantity of the power battery and the DCDC converter are utilized to supplement electricity for the storage battery;
and S600, when the vehicle controller HCM judges that the engine needs to be started to supplement electricity to the storage battery according to the SOC value of the power battery, a storage battery electricity supplementing request is pushed to the server platform through the vehicle-mounted communication module T-BOX, the information that the electric quantity of the storage battery of the vehicle is low and whether the engine is started to supplement electricity is required to be confirmed is pushed to a mobile phone of a vehicle user, and the user is required to confirm the engine starting. According to the instruction of a user, the whole vehicle controller HCM starts and does not start the engine;
and S700, when the user agrees to start the engine to supplement power, the whole vehicle controller HCM receives the user confirmation information from the T-BOX, and then the engine is started. And the ISG is controlled to be in a power generation mode, so that power output is carried out on the power battery pack and the DCDC, and the electric quantity of the power battery pack and the storage battery is supplemented.
Further, after the vehicle body controller BCM is awakened, the power shortage state of the storage battery is checked, the whole vehicle controller HCM is awakened, and a power supply instruction is sent to the whole vehicle controller HCM;
if the body controller BCM records a command that a user refuses to start the engine to supplement power, the body controller BCM cannot be woken up again by the battery EBS.
Further, when the SOC of the power battery is less than or equal to 35%, the vehicle controller HCM determines whether the engine needs to be started according to the SOC state value sent by the power battery controller BMS.
Further, the whole vehicle controller HCM wakes up the high-voltage CAN network after receiving a wake-up instruction of the vehicle body controller BCM.
Further, the vehicle controller HCM determines whether the engine needs to be started according to the SOC state value sent by the power battery controller BMS, and when the SOC value of the power battery is greater than the set lower output limit, the vehicle state is maintained unchanged, and the electric quantity of the power battery and the DCDC converter are used for supplementing electricity to the storage battery.
Further, when the vehicle controller HCM determines that the engine needs to be started to supplement electricity to the storage battery according to the SOC value of the power battery, the vehicle communication module T-BOX pushes a storage battery electricity supplementing request to the server platform, and requests the user to confirm that the engine is started, and then the vehicle controller HCM starts and does not start the engine according to the instruction of the user.
Further, when the user agrees to start the engine to supplement electricity, the whole vehicle controller HCM receives the user confirmation information from the vehicle-mounted communication module T-BOX, starts the engine, and outputs power to the power battery pack and the voltage converter DCDC by controlling the ISG motor to be in a power generation mode so as to supplement the electric quantity of the power battery pack and the storage battery.
Further, if the user confirms that the engine is not started, the vehicle-mounted communication module T-BOX sends an instruction of not starting the engine to the vehicle body controller HCM, the vehicle body controller HCM sends the instruction of not starting the engine to the engine controller ECM, the vehicle body controller HCM confirms that the condition of power supplement is not provided after judging that the SOC of the power battery is lower than the lower limit value of 35% and the instruction of not starting the engine by the user, and the vehicle body controller HCM sends a judgment instruction of power supplement rejection by the user to the vehicle body controller BCM, and meanwhile, the vehicle body controller HCM starts a power-down program of a high-voltage system.
Further, during the battery recharging process, the EBS may feed back the current SOC and current value of the battery in real time, and during the recharging process, the body controller BCM determines the following conditions:
(1) The SOC of the storage battery is larger than a set threshold value;
(2) The charging duration is longer than the set charging time;
(3) The charging current is smaller than or equal to a set current value and lasts for a certain time;
(4) The whole vehicle controller HCM does not allow a charging signal;
if any one of the above conditions is satisfied, the body controller BCM sends a stop power supply instruction to the whole vehicle controller HCM.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) The power supplementing system can comprehensively consider whether to start power supplementing according to the SOC state of the power battery, the vehicle state and the user use requirement, and the user can clearly know whether the hybrid electric vehicle needs power supplementing.
(2) When the electric quantity of the power battery is enough to supplement the electricity to the outside, the power battery is utilized to supplement the electricity to the storage battery. When the electric quantity of the power battery is insufficient and external electricity cannot be supplemented, the engine is started to supplement electricity for the high-voltage power battery and the storage battery according to the remote information confirmation of the user. Under various conditions, the electric power can be supplied to the hybrid electric vehicle, and the situation that the engine cannot be started due to the fact that the battery of the hybrid electric vehicle is deficient can be avoided.
(3) The power supplementing system and the method adopt a method that the whole vehicle controller HCM is matched with the CAN network, the vehicle body controller BCM and the vehicle-mounted communication module T-BOX, more sensitively send power supplementing instructions and feed back power supplementing states, and the power supplementing operation process is stable, so that the problem of power shortage of long-time parking of the hybrid electric vehicle CAN be effectively solved.
Drawings
FIG. 1 is a simplified diagram of a battery recharging function system according to an embodiment of the present invention;
FIG. 2 is a logic diagram of an engine-out power up process according to an embodiment of the present invention;
FIG. 3 is a logic diagram of an engine start power up sequence in accordance with an embodiment of the present invention;
fig. 4 is a schematic flow chart of a battery recharging method for a hybrid electric vehicle according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the system of the battery power supplementing function works as follows: the battery supplementing function is to be performed in a state where the vehicle is asleep. After the vehicle is switched from the ON gear to the OFF gear, the whole vehicle enters a sleep mode. At this time, the sensor of the battery electric quantity detection module EBC periodically detects the state of charge (SOC) of the battery, and judges the state of power deficiency of the SOC of the battery. When the SOC of the storage battery is lower than the lower limit of 65% of the insufficient power, the storage battery electric quantity detection module EBC wakes up the body controller BCM through the LIN line and sends out a signal of too low voltage and electric quantity. After the vehicle body controller BCM is awakened, the SOC value and the voltage too low signal of the accumulator EBS are confirmed, and meanwhile, the five doors of the vehicle are confirmed to be in a closed state, and the key is in a vehicle-leaving state. If the condition is met, the whole vehicle controller HCM is awakened, and the vehicle body controller BCM sends a power supply instruction to the whole vehicle controller HCM. After the whole vehicle controller HCM receives a wake-up signal of the vehicle body controller BCM, the high-voltage CAN network is waken up. After fault diagnosis of the high-voltage component is completed, the whole vehicle controller HCM can send a high-voltage relay closing instruction, close the high-voltage relay, switch on the whole circuit and send an enabling instruction to the voltage converter DCDC. After the whole vehicle is electrified at high voltage, when the SOC of the power battery is more than 35%, the power battery is utilized to supplement electricity for the storage battery. After the DCDC starts to work, the working state is fed back to the HCM of the whole vehicle controller. The whole vehicle controller HCM feeds back the state of the battery power supply in progress to the vehicle body controller BCM. After receiving the state value of the power-up "in progress" of the vehicle body controller HCM, the vehicle body controller BCM starts timing. During battery recharging, the EBS feeds back the current battery SOC and current values in real time. When the body controller BCM determines that: (1) SOC of the battery is greater than 90%; (2) a charging duration of greater than 10 minutes; 3) The charging current is less than or equal to 0.5A and lasts for 30 seconds; (4) the whole vehicle controller HCM does not allow the charging signal. If any one of the conditions is satisfied, the body controller BCM sends a stop power supply command to the whole vehicle controller HCM. After receiving a power-up stopping instruction of the vehicle body controller BCM, the whole vehicle controller HCM sends a power-up stopping instruction to the DCDC, and the high-voltage relay is disconnected. And simultaneously, sending a sleep instruction to the high-voltage network. After receiving a sleep instruction of the whole vehicle controller HCM, the vehicle body controller BCM stops sending CAN wake-up signals, and the network enters sleep. If the SOC of the power battery is less than or equal to 35%, the whole vehicle controller HCM determines whether the engine needs to be started according to the SOC state value sent by the power battery controller BMS, and the engine needs to be started, and when the battery is charged, the idle surplus power started by the engine can be used for charging the power battery. Further, the vehicle controller HCM sends an alarm reminding of low battery power to the vehicle-mounted communication module T-BOX, after receiving the instruction, the T-BOX pushes a battery power supplementing request to the server platform, and the server pushes information "your vehicle battery power is low and confirms whether to start the engine to supplement power" to the mobile phone APP of the user. After the user confirms whether to start the engine or not on the mobile phone, a starting instruction is sent to the vehicle-mounted communication module T-BOX through the server. After receiving an engine starting instruction of the vehicle-mounted communication module T-BOX, the HCM judges that five doors of the vehicle are in a closed state, a key switch is in an OFF state, a gear BOX gear is in a P gear position, and the vehicle speed is equal to 0km/h. When the conditions are met, the whole vehicle controller HCM sends a starting instruction to the engine controller ECM. And after the engine controller ECM is successfully started, an engine start command signal is sent to the whole vehicle controller HCM. Because the engine is coaxially connected with the ISG motor, the rotation speed of the engine is dragged to the target rotation speed through the debugging control of the ISG motor. The ISG motor is connected with the voltage converter and the storage battery respectively, and is used for converting the electricity generated by the ISG motor into voltage capable of charging the storage battery. Then, the ISG motor is controlled to enter a power generation mode, power output is carried out on the power battery pack and the DCDC, and the electric quantity of the power battery pack and the electric quantity of the storage battery are supplemented. Further, the whole vehicle controller HCM confirms the operating state of the DCDC, and feeds back the state of battery power replenishment "in progress" to the vehicle body controller BCM.
In the process of the battery charging period, if the engine has a problem, the whole vehicle controller HCM sends a charging disallowing signal to the vehicle body controller BCM, and the battery charging function is exited; when any one of the following conditions is satisfied in the battery supplementing process: (1) SOC of the battery is greater than 90%; (2) a charging duration of greater than 10 minutes; 3) The charging current is less than or equal to 0.5A and lasts for 30 seconds; (4) The whole vehicle controller HCM does not allow a charging signal, and the battery power supplementing function is stopped.
If the user confirms that the engine is not started, the vehicle-mounted communication module T-BOX sends an instruction of not starting the engine to the vehicle control unit HCM. The complete vehicle controller HCM sends a non-start command to the engine controller ECM. Further, after judging that the SOC of the power battery is lower than the lower limit value of 35% and a user command to not start the engine, the whole vehicle controller HCM confirms that the condition of power supply is not provided, and the whole vehicle controller HCM sends a judgment command of power supply rejection to the vehicle body controller BCM, and simultaneously, the whole vehicle controller HCM starts a power-down program of the high-voltage system. After receiving the power-up stop signal of the HCM, the vehicle body controller BCM performs sleep control of the whole vehicle and low-voltage power-down of the whole vehicle. When the user refuses to start the engine for power up, the battery EBS will resend the wake-up signal to the body controller BCM after a battery EBS detection period due to the low voltage of the battery. The body controller BCM records the instruction that the user does not allow the engine to start before the next time the user starts the vehicle. The body controller BCM is not awakened by the battery EBS via LIN until a signal is received from the user to unlock the vehicle or to start the vehicle.
As shown in fig. 2, when the engine is not started, the power supplementing process is as follows: when the SOC of the storage battery is lower than 65% of the lower limit of the insufficient power and the SOC of the power battery is higher than 35%, the vehicle body controller BCM is awakened through the LIN line, and a signal of too low voltage and electric quantity is sent. After the vehicle body controller BCM wakes up, the SOC value and the voltage too low signal of the accumulator EBS are confirmed, and meanwhile, the five doors of the vehicle are confirmed to be in a closed state, and if one of the conditions is not met, the vehicle enters a sleep state. If the condition is satisfied, waking up the whole vehicle controller HCM and sending a power-up instruction to the whole vehicle controller HCM. And after the whole vehicle controller HCM receives the BCM wake-up signal, the high-voltage CAN network is waken up. At the moment, judging that the high-voltage part has no fault and the power battery has no fault, if the conditions are not met, carrying out high-voltage power down, and preparing the vehicle for sleeping; if the condition is met, the high voltage relay is closed, the entire line is switched on, and an enabling instruction is sent to the voltage converter DCDC. After the whole vehicle is electrified at high voltage, judging whether the SOC of the power battery is more than 35%, if the SOC of the power battery is less than 35%, the whole vehicle controller HCM requests to start the generator, and if the SOC of the power battery is more than 35%, the power battery is utilized to supplement electricity to the storage battery, and the storage battery starts to supplement electricity. During battery recharging, the EBS feeds back the current battery SOC and current values in real time. When the body controller BCM determines that: (1) SOC of the battery is greater than 90%; (2) a charging duration of greater than 10 minutes; 3) The charging current is less than or equal to 0.5A and lasts for 30 seconds; (4) the whole vehicle controller HCM does not allow the charging signal. If any one of the conditions is met, the DCDC stops working, the high-voltage relay is disconnected, the storage battery stops supplementing electricity, and the vehicle goes to sleep.
As shown in fig. 3, the power supplementing process of the generator is as follows: when the SOC of the storage battery is lower than the lower limit of 65% of the power shortage, the vehicle body controller BCM is awakened through the LIN line, and a signal of low voltage and low electric quantity is sent. After the vehicle body controller BCM wakes up, the SOC value and the voltage too low signal of the accumulator EBS are confirmed, and meanwhile, the five doors of the vehicle are confirmed to be in a closed state, and if one of the conditions is not met, the vehicle enters a sleep state. If the condition is satisfied, waking up the whole vehicle controller HCM and sending a power-up instruction to the whole vehicle controller HCM. And after the whole vehicle controller HCM receives the BCM wake-up signal, the high-voltage CAN network is waken up. At the moment, judging that the high-voltage part has no fault and the power battery has no fault, if the conditions are not met, carrying out high-voltage power down, and preparing the vehicle for sleeping; if the condition is met, the high voltage relay is closed, the entire line is switched on, and an enabling instruction is sent to the voltage converter DCDC. After the whole vehicle is electrified at high voltage, judging whether the SOC of the power battery is less than 35%, if not, starting the battery to supplement electricity for the storage battery; if so, the whole vehicle controller HCM requests to start the generator. Further, the vehicle controller HCM sends an alarm reminding of low battery power to the vehicle-mounted communication module T-BOX, after receiving the instruction, the T-BOX pushes a battery power supplementing request to the server platform, and the server pushes information "your vehicle battery power is low and confirms whether to start the engine to supplement power" to the mobile phone APP of the user. After the user confirms whether to start the engine or not on the mobile phone, a starting instruction is sent to the vehicle-mounted communication module T-BOX through the server. After receiving an engine starting instruction of the T-BOX, the HCM starts a generator, then the ISG motor enters a power generation mode, and outputs power to the power battery pack and the voltage converter DCDC to supplement the electric quantity of the power battery pack and the storage battery. During battery recharging, the EBS feeds back the current battery SOC and current values in real time. When the body controller BCM determines that: (1) SOC of the battery is greater than 90%; (2) a charging duration of greater than 10 minutes; 3) The charging current is less than or equal to 0.5A and lasts for 30 seconds; (4) the whole vehicle controller HCM does not allow the charging signal. If any one of the conditions is met, the voltage converter DCDC stops working, the high-voltage relay is disconnected, the storage battery stops supplementing electricity, and the vehicle goes to sleep.
As shown in fig. 4, the invention provides a battery recharging method for a hybrid electric vehicle, comprising the following steps:
and S100, periodically detecting the electric quantity and the voltage state of the storage battery by the storage battery EBS. When the set lower limit value of the power shortage is triggered, the EBS wakes up the body controller BCM.
S200, after the vehicle body controller BCM is awakened, the power shortage state of the storage battery is checked, then the whole vehicle controller HCM is awakened, and a power supply instruction is sent to the whole vehicle controller HCM. If the body controller BCM records a command that a user refuses to start the engine to supplement power, the body controller BCM cannot be woken up again by the battery EBS.
S300, after receiving a wake-up instruction of a vehicle body controller BCM, the whole vehicle controller HCM wakes up other parts on the high-voltage CAN network, including a power battery controller BMS, an ISG controller, a Motor controller, a distribution box PDM and a DCDC converter.
And S400, after confirming that all the high-voltage network nodes send CAN messages, the whole vehicle controller HCM sends high-voltage power-on time sequence control signals according to the whole vehicle state of the vehicle, including but not limited to gears, vehicle speed, vehicle door opening and closing states, key opening and closing signals, fault grade signals and the like, so as to finish high-voltage power-on.
S500, the vehicle controller HCM judges whether the engine needs to be started or not according to the SOC state value sent by the power battery controller BMS. When the SOC value of the power battery is larger than the set lower output limit, the vehicle state is kept unchanged, and the electric quantity of the power battery and the DCDC converter are utilized to supplement electricity for the storage battery.
And S600, when the vehicle controller HCM judges that the engine needs to be started to supplement electricity to the storage battery according to the SOC value of the power battery, a storage battery electricity supplementing request is pushed to the server platform through the vehicle-mounted communication module T-BOX, the information that the electric quantity of the storage battery of the vehicle is low and whether the engine is started to supplement electricity is required to be confirmed is pushed to a mobile phone of a vehicle user, and the user is required to confirm the engine starting. And according to the instruction of the user, the whole vehicle controller HCM starts and does not start the engine.
And S700, when the user agrees to start the engine to supplement power, the whole vehicle controller HCM receives the user confirmation information from the T-BOX, and then the engine is started. And the ISG is controlled to be in a power generation mode, so that power output is carried out on the power battery pack and the DCDC, and the electric quantity of the power battery pack and the storage battery is supplemented.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.