WO2017197832A1

WO2017197832A1 - Vehicle, and charging control method and system for low-voltage storage battery of vehicle

Info

Publication number: WO2017197832A1
Application number: PCT/CN2016/103127
Authority: WO
Inventors: 肖伟; 邵桂欣
Original assignee: 北京新能源汽车股份有限公司
Priority date: 2016-05-18
Filing date: 2016-10-24
Publication date: 2017-11-23
Also published as: CN105922873B; CN105922873A

Abstract

A vehicle, and a charging control method and system for a low-voltage storage battery of a vehicle. The charging control method comprises the following steps: after a vehicle enters a standing state, a vehicle controller (100) entering a low power-consumption timing mode and starting timing; when the timed time reaches a wake-up time stored in the vehicle controller (100), waking up the vehicle controller (100) so that the vehicle controller (100) detects a current voltage of a low-voltage storage battery (500) and determines whether the current voltage of the low-voltage storage battery (500) is less than or equal to a pre-set low-power voltage threshold value; and if the current voltage of the low-voltage storage battery (500) is less than or equal to the pre-set low-power voltage threshold value, the vehicle controller (100) controlling the operation of a DC/DC converter (200) so as to charge the low-voltage storage battery (500). According to the method, when the timed time reaches the wake-up time, by judging the current voltage of the low-voltage storage battery (500) so as to confirm whether to conduct charging, the low-voltage storage battery (500) can be charged according to actual requirements of same, and the standing loss of the vehicle can be reduced.

Description

Method and system for charging control of vehicle and low voltage battery for vehicle

Technical field

The present invention relates to the field of vehicle technology, and in particular, to a charging control method for a low voltage battery of a vehicle, a charging control system for a low voltage battery of the vehicle, and a vehicle.

Background technique

At present, intelligentization and electrification are the development trend of automobiles. In order to realize the driving control of automobiles and the realization of various intelligent functions, a plurality of electronic control systems are introduced, so the safety and reliability of the low-voltage power supply system is increasingly important.

Usually, in order to realize the intelligentization of control, after the whole vehicle is powered off, multiple electronic control systems are still in a low-power working state, and the state of the whole vehicle is monitored at all times, thereby increasing the static loss of the whole vehicle, so The state monitoring of the low-voltage control source of the vehicle (such as the low-voltage battery) and the timely and timely replenishment of the vehicle before its loss of power are increasingly concerned about the design of the vehicle.

In the related art, the power-on system can be activated to recharge the low-voltage battery in an unattended environment, but the following shortcomings exist in the currently implemented solution:

Regularly start the power-on work: the power state of the low-voltage battery is not monitored, and the start-up time is determined by the empirical value. When the battery is fast, the power supply cannot be obtained in time, or when the battery power is high, the power-on function is still activated.

The intelligent charging time is fixed: the state of the low-voltage battery is not monitored during the charging process, the charging time is fixed, and there is a defect that the charging time is too long or too short.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, a first object of the present invention is to provide a charging control method for a low-voltage battery of a vehicle, which determines whether or not to perform charging by judging a current voltage of the low-voltage battery when the chrono time reaches the waking time. Therefore, it can be charged according to the actual demand of the low-voltage battery, and the rest loss of the whole vehicle can be reduced.

A second object of the present invention is to propose a charging control system for a low voltage battery of a vehicle.

A third object of the invention is to propose a vehicle.

In order to achieve the above object, a first aspect of the present invention provides a charging control method for a low voltage battery of a vehicle, the vehicle including a vehicle controller, a DC/DC converter, a high voltage battery system, and a vehicle body control unit. The vehicle controller is in communication with the body control unit, the DC/DC converter, and a battery manager in the high voltage battery system, respectively, the DC/DC converter is used in the high voltage battery system The high-voltage power output of the power battery is converted into low-voltage power to supply the low-voltage battery, and the charging control method includes the following steps: after the vehicle enters a resting state, the vehicle controller enters a low-power timekeeping mode And start timing; when the time reaches the vehicle Awakening the vehicle controller when the wake-up time is stored in the controller, the vehicle controller detects a current voltage of the low-voltage battery, and determines whether a current voltage of the low-voltage battery is less than or equal to a preset low battery voltage a threshold; if the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery.

According to the charging control method for a low-voltage battery of a vehicle according to an embodiment of the present invention, after the vehicle enters a stationary state, the vehicle controller enters a low-power timekeeping mode and starts timing, and when the time reaches the storage in the vehicle controller Wake up time, wake up the vehicle controller, the vehicle controller detects the current voltage of the low voltage battery, and determines whether the current voltage of the low voltage battery is less than or equal to the preset low battery voltage threshold, if the current voltage of the low voltage battery is less than or equal to the preset The low battery voltage threshold, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery. Therefore, when the aging time reaches the waking time, the method determines whether the charging is performed by determining the current voltage of the low voltage battery, so that charging can be performed according to the actual demand of the low voltage battery, and the rest loss of the entire vehicle can be reduced.

In addition, the above-described charging control method for a low voltage battery for a vehicle according to the present invention may further have the following additional technical features:

In an embodiment of the present invention, when the vehicle controller controls the DC/DC converter to operate, the method further includes: the vehicle controller detecting the vehicle according to the vehicle body control unit The front nacelle cover state determines whether the front nacelle cover of the vehicle is open; if it is determined that the front nacelle cover of the vehicle is open, the vehicle controller prohibits the DC/DC converter from operating.

In an embodiment of the present invention, when the DC/DC converter charges the low voltage battery, the method further includes: the vehicle controller acquiring an operating current of the DC/DC converter, and determining Whether the operating current of the DC/DC converter is less than a preset current threshold; if the operating current of the DC/DC converter is less than a preset current threshold, the vehicle controller determines that the low-voltage battery is fully charged. And controlling the DC/DC converter to stop working.

In an embodiment of the invention, after the charging of the low-voltage battery is completed, the vehicle controller controls the vehicle to be powered off, and calculates according to the current voltage of the low-voltage battery and the static loss of the vehicle. The next round of time required to wake up the vehicle controller is stored and updated to update the wake-up time stored in the vehicle controller.

In an embodiment of the present invention, when the current voltage of the low voltage battery is greater than a preset low battery voltage threshold, the vehicle controller is based on a current voltage of the low voltage battery and a vehicle static loss of the vehicle. The time required to wake up the vehicle controller in the next round is calculated and stored to update the wake-up time stored in the vehicle controller.

In an embodiment of the present invention, after the vehicle controller enters a low power consumption timing mode, if the vehicle controller receives a wakeup command, the vehicle controller controls the vehicle to enter and A working mode corresponding to the wake-up instruction, and controlling the vehicle to be powered off after the working mode corresponding to the wake-up command ends, and acquiring a preset wake-up time after the vehicle is powered off to update the vehicle control Wake-up time stored in the device.

In order to achieve the above object, a second aspect of the present invention provides a charging control system for a low voltage battery of a vehicle, including a vehicle controller, a DC/DC converter, a high voltage battery system, and a vehicle body control unit. a vehicle controller is in communication with the body control unit, the DC/DC converter, and a battery manager in the high voltage battery system, the vehicle controller is coupled to the low voltage battery, the DC/DC The inverter is respectively connected to the low voltage battery and the high voltage battery system, wherein the DC/DC converter is configured to convert high voltage power outputted by the power battery in the high voltage battery system into low voltage power to supply a low-voltage battery; the vehicle body control unit is configured to detect a front hatch state of the vehicle; the vehicle controller stores a wake-up time, and the vehicle controller enters after the vehicle enters a rest state a low power consumption timing mode, and starting timing, and when the chronograph time reaches a stored wakeup time, the vehicle controller automatically wakes up, and the vehicle controller detects the low pressure storage a current voltage of the pool, and determining whether the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, and controlling the DC/DC when a current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold The converter operates to charge the low voltage battery.

According to the charging control system for a low voltage battery of a vehicle according to an embodiment of the present invention, the vehicle controller enters a low power consumption timing mode after the vehicle enters a stationary state, and starts timing, and when the time lapse reaches the stored wakeup time, The vehicle controller automatically wakes up, the vehicle controller detects the current voltage of the low voltage battery, and determines whether the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, and the current voltage of the low voltage battery is less than or equal to a preset low battery. The voltage threshold controls the DC/DC converter to operate to charge the low voltage battery. Therefore, when the aging time reaches the waking time, the system determines whether the charging is performed by judging the current voltage of the low-voltage battery, so that charging can be performed according to the actual demand of the low-voltage battery, and the rest loss of the entire vehicle can be reduced.

The above charging control system for a low voltage battery of a vehicle may also have the following additional technical features:

In an embodiment of the present invention, when controlling the DC/DC converter to operate, the vehicle controller further determines the vehicle according to a state of a front hatch of the vehicle detected by the vehicle body control unit. Whether the front nacelle cover is open, and the vehicle controller prohibits the DC/DC converter from operating when the front nacelle cover of the vehicle is opened.

In an embodiment of the invention, when the DC/DC converter charges the low voltage battery, the vehicle controller further acquires an operating current of the DC/DC converter, and determines the DC Whether the operating current of the /DC converter is less than a preset current threshold, and when the operating current of the DC/DC converter is less than a preset current threshold, the vehicle controller determines that the low-voltage battery is fully charged and controls The DC/DC converter stops working.

In an embodiment of the invention, after the charging of the low-voltage battery is completed, the vehicle controller controls the vehicle to be powered off, and calculates according to the current voltage of the low-voltage battery and the static loss of the vehicle. The time required to wake up the vehicle controller in the next round and stored to update the wake-up time stored in the vehicle controller; or when the current voltage of the low-voltage battery is greater than a preset low battery voltage threshold The vehicle controller calculates the time required to wake up the vehicle controller in the next round according to the current voltage of the low voltage battery and the vehicle static loss of the vehicle. Store to update the wake-up time stored in the vehicle controller.

In order to achieve the above object, a third aspect of the present invention provides a vehicle including: a charging control system for a low voltage battery of a vehicle according to an embodiment of the second aspect of the present invention.

According to the vehicle of the embodiment of the present invention, when the aging time reaches the waking time by the charging control system of the low-voltage battery, the current voltage of the low-voltage battery is judged to confirm whether charging is performed, so that charging can be performed according to the actual demand of the low-voltage battery. And can reduce the rest loss of the whole vehicle.

The advantages of the additional aspects of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a flow chart of a charging control method for a low voltage battery of a vehicle according to an embodiment of the present invention.

2 is a flow chart of a charging control method for a low voltage battery of a vehicle according to another embodiment of the present invention.

3 is a block schematic diagram of a charge control system for a low voltage battery of a vehicle in accordance with one embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A charging control method and system for a vehicle and a low voltage battery for a vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In an embodiment of the invention, the vehicle includes a vehicle controller, a DC/DC converter, a high voltage battery system, and a body control unit, and the vehicle controller is respectively associated with the body control unit, the DC/DC converter, and the high voltage battery system. The battery manager communicates, and the DC/DC converter is used to convert the high voltage power outputted by the power battery in the high voltage battery system into low voltage power to supply the low voltage battery.

As shown in FIG. 1, the charging control method for a low voltage battery for a vehicle includes the following steps:

S1, after the vehicle enters the stationary state, the vehicle controller enters the low power consumption timing mode and starts timing.

S2, when the chronograph time reaches the wake-up time stored in the vehicle controller, wake up the vehicle controller, the vehicle controller Detecting the current voltage of the low voltage battery and determining whether the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold. The preset low battery voltage threshold may be calibrated according to actual conditions, or may be a preset low battery voltage threshold when the vehicle is shipped.

In an embodiment of the invention, the wake-up time may be calculated based on the current voltage of the low voltage battery and the vehicle static loss of the vehicle.

S3. If the current voltage of the low voltage battery is less than or equal to the preset low battery voltage threshold, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery.

Specifically, when the vehicle enters the rest state, the vehicle controller calculates the wake-up time according to the current voltage of the low-voltage battery and the vehicle static loss of the vehicle when the vehicle enters the rest state, for example, deposits the vehicle. In the controller's storage space, then the vehicle controller enters the low-power timing mode and starts timing. When the chronograph time reaches the wake-up time stored in the vehicle controller, the vehicle controller automatically wakes up, and then the vehicle controller detects the current voltage of the low-voltage battery, and determines whether the current voltage of the low-voltage battery is less than or equal to the preset low battery. Voltage threshold. If the current voltage of the low voltage battery is less than or equal to the preset low battery voltage threshold, the vehicle controller wakes up the DC/DC converter and controls the DC/DC converter to operate to charge the low voltage battery. Therefore, when the chrono time reaches the waking time, the current voltage of the low-voltage battery is judged to confirm whether or not charging is performed, so that charging can be performed according to the actual demand of the low-voltage battery, and the standing loss of the entire vehicle can be reduced.

It should be understood that the storage space in this embodiment is not limited to the storage space based on the entity, for example, a hard disk, and the storage space may also be a storage space (cloud storage space) of the network hard disk of the vehicle controller.

In an embodiment of the present invention, when the current voltage of the low voltage battery is greater than a preset low battery voltage threshold, the vehicle controller calculates the next wake vehicle control according to the current voltage of the low voltage battery and the vehicle static loss of the vehicle. The time required by the device is stored to update the wake-up time stored in the vehicle controller.

That is to say, when the chronograph time reaches the waking time, the vehicle controller automatically wakes up and detects the current voltage of the low voltage battery. If the current voltage of the low voltage battery is less than or equal to the preset low battery voltage threshold, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery; if the current voltage of the low voltage battery is greater than the preset low battery voltage threshold , the vehicle controller calculates the time required to wake up the vehicle controller in the next round according to the current voltage of the low-voltage battery and the static loss of the vehicle, and stores it to update the wake-up time stored in the vehicle controller, so that the actual vehicle can be In the case of charging the low-voltage battery, for example, when the low-voltage battery is quickly consumed, the low-voltage battery can be recharged in time, and the intelligent management of the low-voltage battery is improved. Moreover, the effective solution to the current state of the low-voltage battery of the vehicle is not effectively monitored, and the empirical value is used to determine when to charge the low-voltage battery. The existing low-voltage battery cannot obtain timely power supply when the power consumption is fast, and the low-voltage battery does not charge. When the battery is low, the problem of the power-on function is still activated.

In the embodiment of the present invention, the vehicle controller automatically wakes up, and estimates the current power of the low-voltage battery by detecting the current voltage of the low-voltage battery, does not involve other components, and does not need to be high-voltage, which not only ensures the intelligent realization of the function. It is simple and simple, and it reduces the low-voltage loss of the whole vehicle.

According to an embodiment of the present invention, when the DC/DC converter charges the low voltage battery, the method further includes: obtaining, by the vehicle controller, an operating current of the DC/DC converter, and determining whether the operating current of the DC/DC converter is less than The preset current threshold; if the operating current of the DC/DC converter is less than the preset current threshold, the vehicle controller determines that the low-voltage battery is fully charged and controls the DC/DC converter to stop working. The preset current threshold may be calibrated according to actual conditions, or may be a preset current threshold when the vehicle is shipped from the factory. Therefore, it can be determined according to the working current of the DC/DC converter whether the low-voltage battery has been charged, effectively solving the current state of the low-voltage battery during the charging process of the low-voltage battery, and the existing low-voltage battery stops charging when not fully charged. And the problem of continuing charging when the low voltage battery is fully charged.

Further, after the charging of the low-voltage battery is completed, the vehicle controller controls the vehicle to be powered off, and calculates the time required to wake up the vehicle controller in the next round according to the current voltage of the low-voltage battery and the static loss of the vehicle, and stores it for updating. The wake-up time stored in the vehicle controller. Thereby, the intelligent management of the low-voltage battery is further strengthened.

According to an embodiment of the invention, after the vehicle controller enters the low power consumption timing mode, if the vehicle controller receives the wakeup command, the vehicle controller controls the vehicle to enter the working mode corresponding to the wakeup command, and wakes up After the working mode corresponding to the instruction ends, the vehicle is powered off, and the preset wake-up time is acquired after the vehicle is powered off to update the wake-up time stored in the vehicle controller. The preset wake-up time may be calibrated according to actual conditions, or may be a preset wake-up time when the vehicle is shipped from the factory. For example, the preset wake-up time may be 30 minutes.

In order to improve the safety of the charging process, in one embodiment of the present invention, when the vehicle controller controls the DC/DC converter to operate, the vehicle controller also includes the front nacelle of the vehicle detected by the vehicle body control unit. The state determines whether the front nacelle cover of the vehicle is open. If it is determined that the front nacelle cover of the vehicle is open, the vehicle controller prohibits the DC/DC converter from operating. Therefore, during the charging process, when the current nacelle cover is opened, the DC/DC converter is prohibited from working, thereby effectively preventing the front hatch cover from being opened due to not monitoring the state of the front nacelle cover of the vehicle, and DC/ When the DC converter is still in operation, without the reminder function, the positive electrode of the low-voltage battery is placed in the metal part of the vehicle body, and the vehicle is in danger of low-voltage short-circuit, thereby improving safety.

Further, after the vehicle controller prohibits the DC/DC converter from operating, if the front nacelle cover of the vehicle is turned off, the vehicle controller restores the DC/DC converter to work and continues to charge the vehicle low-voltage battery. This ensures the integrity of the charge function.

In an embodiment of the present invention, when the vehicle controller prohibits the DC/DC converter from operating, if the vehicle controller receives the wake-up command, the vehicle controller controls the vehicle to enter an operation mode corresponding to the wake-up command, And controlling the vehicle to be powered off after the working mode corresponding to the wake-up command ends, and acquiring a preset wake-up time (for example, 30 minutes) after the vehicle is powered off to update the wake-up time stored in the vehicle controller.

In addition, if the vehicle controller prohibits the DC/DC converter from operating, if the vehicle controller does not receive the call When the command is awakened, it is determined in real time whether the front nacelle cover of the vehicle is closed, thereby further ensuring the integrity of the replenishing function.

In order to make the present invention more clearly understood by those skilled in the art, FIG. 2 is a flowchart of a charging control method for a low voltage battery of a vehicle according to a specific example of the present invention. As shown in FIG. 2, the charging control process of the low voltage battery may include the following steps:

S101, the vehicle enters a resting state.

S102, VCU (Vehicle Control Unit, vehicle controller) enters low power timing mode.

S103. Determine whether the vehicle controller receives the wake-up command. If yes, go to step S114; if no, go to step S104.

S104. Determine whether the timing time reaches the wake-up time stored in the vehicle controller. If yes, go to step S105; if no, go back to step S102.

S105, the vehicle controller automatically wakes up and detects the current voltage of the low voltage battery.

S106. Determine whether the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold. If yes, go to step S107; if no, go to step S113. It can be understood that when the power of the low-voltage battery is reduced, the voltage value and current value of the corresponding low-voltage battery are also reduced, so that the low-voltage battery can be determined by determining the current voltage of the low-voltage battery or the current current of the low-voltage battery. Current battery level and whether it needs to be charged.

S107, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery.

S108. Determine whether the front nacelle cover of the vehicle is open. If yes, go to step S117; if no, go to step S109.

S109. Determine whether the operating current of the DC/DC converter is less than a preset current threshold. If yes, go to step S110, if no, go back to step S109.

S110, the vehicle controller cancels the DC/DC converter enable, that is, the DC/DC converter stops working, and the charging ends.

S111. Determine whether the vehicle controller receives the wake-up command. If yes, go to step S114; if no, go to step S112.

S112, the vehicle controller controls the vehicle to be powered off.

S113. The vehicle controller calculates the time required to wake up the vehicle controller in the next round according to the current voltage of the low-voltage battery and the vehicle static loss of the vehicle and stores to update the wake-up time stored in the vehicle controller.

In S114, the whole vehicle enters another working mode (the working mode corresponding to the wake-up instruction).

S115. Determine whether the other working mode (the working mode corresponding to the wake-up command) ends. If yes, go to step S106; if no, go back to step S114.

S116, controlling the vehicle to be powered off, and acquiring a preset wake-up time (for example, 30 minutes) after the vehicle is powered off to update the wake-up time stored in the vehicle controller.

In S117, the vehicle controller prohibits the DC/DC converter from operating.

S118. Determine whether the vehicle controller receives the wake-up command. If yes, go back to step S114; if no, go back to step S108.

As shown in FIG. 3, the charging control system for a low voltage battery of a vehicle includes a vehicle controller 100, a DC/DC converter 200, a high voltage battery system 300, and a vehicle body control unit 400. The vehicle controller 100 communicates with the body controller unit 400, the DC/DC converter 200, and the battery manager 310 in the high voltage battery system 300, respectively, and the vehicle controller 100 is connected to the low voltage battery 500, and the DC/DC converter 200 is connected to the low voltage battery 500 and the high voltage battery system 600, respectively.

Specifically, the DC/DC converter 200 is configured to convert high-voltage power outputted by the power battery in the high-voltage battery system 600 into low-voltage power to supply the low-voltage battery 500; and the vehicle body control unit 400 is configured to detect the front hatch state of the vehicle. The vehicle controller 100 stores a wake-up time, and the vehicle controller 100 enters the low-power timekeeping mode after the vehicle enters the rest state, and starts timing, and when the time is up to reach the stored wake-up time, the vehicle controller 100 automatically wakes up, the vehicle controller 100 detects the current voltage of the low voltage battery 500, and determines whether the current voltage of the low voltage battery 500 is less than or equal to a preset low battery voltage threshold, and the current voltage of the low voltage battery 500 is less than or equal to a preset low. The DC/DC converter 200 is controlled to operate to charge the low voltage battery 500 at the battery voltage threshold. The preset low battery voltage threshold can be calibrated according to actual conditions.

In an embodiment of the invention, the wake-up time may be calculated based on the current voltage of the low voltage battery 500 and the vehicle static loss of the vehicle.

Specifically, when the vehicle enters the rest state, the vehicle controller 100 calculates the wake-up time according to the current voltage of the low-voltage battery 500 and the vehicle static loss of the vehicle when the vehicle enters the rest state last time, for example, depositing In the storage space of the vehicle controller 100, the vehicle controller 100 then enters the low power consumption timing mode and starts timing. When the chronograph time reaches the wake-up time stored in the vehicle controller 100, the vehicle controller 100 automatically wakes up, and then the vehicle controller 100 detects the current voltage of the low-voltage battery and determines whether the current voltage of the low-voltage battery is less than or equal to the preset. Low battery voltage threshold. If the current voltage of the low voltage battery is less than or equal to the preset low battery voltage threshold, Then, the vehicle controller 100 wakes up the high voltage battery system 600 through the bus and controls the whole vehicle to enter the high voltage connection state, and wakes up the DC/DC converter 200 through the bus, and controls the DC/DC converter 200 to operate to perform the low voltage battery 500. Charging. Thus, when the chrono time reaches the awake time, the current voltage of the low voltage battery 500 is judged to confirm whether or not charging is performed, so that charging can be performed according to the actual demand of the low voltage battery 500, and the standing loss of the entire vehicle can be reduced.

It should be understood that the storage space in this embodiment is not limited to the storage space based on the entity, for example, a hard disk, and the storage space may also be a storage space (cloud storage space) of the network hard disk of the vehicle controller 100.

Further, in this embodiment, only the vehicle controller 100 and the wake-up DC/DC converter 200 are used to complete the detection of the low-voltage battery 500, and according to the detection result, it is determined whether the low-voltage battery 500 needs to be charged, and is judged. When charging is required, the low voltage battery 500 is charged, thereby saving controller resources.

In an embodiment of the present invention, when the current voltage of the low voltage battery 500 is greater than a preset low battery voltage threshold, the vehicle controller 100 calculates the next wake according to the current voltage of the low voltage battery 500 and the vehicle static loss of the vehicle. The time required by the vehicle controller 100 is stored and updated to update the wake-up time stored in the vehicle controller 100.

That is, when the chrono time reaches the awake time, the vehicle controller 100 automatically wakes up and detects the current voltage of the low voltage battery 500. If the current voltage of the low voltage battery 500 is less than or equal to the preset low battery voltage threshold, the vehicle controller 100 controls the DC/DC converter 200 to operate to charge the low voltage battery 500; if the current voltage of the low voltage battery 500 is greater than the preset The low battery voltage threshold, the vehicle controller 100 calculates the time required to wake up the vehicle controller 100 in the next round according to the current voltage of the low voltage battery 500 and the vehicle static loss of the vehicle and stores it to update the vehicle controller 100. The stored wake-up time, so that the low-voltage battery 500 can be supplemented according to the actual situation. For example, when the low-voltage battery 500 consumes power quickly, the low-voltage battery 500 can be timely charged, and the intelligent management of the low-voltage battery 500 is improved. . Moreover, the current state of the low-voltage battery 500 of the vehicle is not effectively monitored, and the empirical value is used to determine when to recharge the low-voltage battery 500. The existing low-voltage battery 500 cannot obtain timely power-on when the power is consumed rapidly, and the low voltage. When the battery 500 is not low, the power-on function is still activated.

In the embodiment of the present invention, the vehicle controller 100 automatically wakes up, and estimates the current power of the low-voltage battery by detecting the current voltage of the low-voltage battery 500, does not involve other components, and does not need to apply high voltage, which not only ensures the intelligent realization of the function. It is simple and simple, and it reduces the low-voltage loss of the whole vehicle.

According to an embodiment of the present invention, when the DC/DC converter 200 charges the low voltage battery 500, the vehicle controller 100 also acquires the operating current of the DC/DC converter 200 and determines the operation of the DC/DC converter 200. Whether the current is less than a preset current threshold, and when the operating current of the DC/DC converter 200 is less than a preset current threshold, the vehicle controller 100 determines that the low-voltage battery 500 is fully charged, and controls the DC/DC converter 200 to stop operating. The preset current threshold can be calibrated according to actual conditions. Therefore, it can be determined whether the low voltage battery 500 has been charged according to the operating current of the DC/DC converter 200, effectively solving the process of charging the low voltage battery 500. The current state of the low voltage battery 500 is not monitored, there is a problem that the low voltage battery 500 stops charging when it is not fully charged, and continues charging when the low voltage battery 500 is fully charged.

Further, after the charging of the low voltage battery 500 is completed, the vehicle controller 100 controls the vehicle to be powered off, and calculates the time required to wake up the vehicle controller 100 according to the current voltage of the low voltage battery 500 and the vehicle static loss of the vehicle. And stored to update the wake-up time stored in the vehicle controller 100. Thereby, the intelligent management of the low-voltage battery is further strengthened.

According to an embodiment of the invention, after the vehicle controller 100 enters the low power consumption timing mode, if the vehicle controller 100 receives the wakeup command, the vehicle controller 100 controls the vehicle to enter an operation mode corresponding to the wakeup command, and The vehicle is powered off after the end of the working mode corresponding to the wake-up command, and the preset wake-up time is acquired after the vehicle is powered off to update the wake-up time stored in the vehicle controller 100. The preset wake-up time can be calibrated according to actual conditions. For example, the preset wake-up time can be 30 minutes.

In order to improve the safety of the charging process, in one embodiment of the present invention, when controlling the operation of the DC/DC converter 200, the vehicle controller 100 further determines the state of the front nacelle cover of the vehicle detected by the vehicle body control unit 400. Whether the front nacelle cover of the vehicle is opened, and the vehicle controller 100 prohibits the DC/DC converter 200 from operating when the front nacelle cover of the vehicle is opened, thereby effectively preventing the vehicle from being unmonitored due to not monitoring the state of the front nacelle cover of the vehicle. When the front nacelle cover is open and the DC/DC converter 200 is still in operation, the positive pole wire of the low-voltage battery 500 is placed on the metal part of the vehicle body without the reminder function, and the vehicle is in danger of low-voltage short-circuit, thereby improving safety. Sex.

Further, after the vehicle controller 100 prohibits the DC/DC converter 200 from operating, if the vehicle body control unit 400 detects that the front nacelle cover of the vehicle is closed, the vehicle controller 100 resumes the operation of the DC/DC converter 200. And continue to charge the vehicle low voltage battery 500, thereby ensuring the integrity of the charging function.

In the embodiment of the present invention, during the time when the vehicle controller 100 prohibits the DC/DC converter 200 from operating, if the vehicle controller 100 receives the wake-up command, the vehicle controller 100 controls the vehicle to enter the wake-up command. Working mode, and controlling the vehicle to be powered off after the end of the working mode corresponding to the wake-up command, and acquiring a preset wake-up time (for example, 30 minutes) after the vehicle is powered off to update the wake-up time stored in the vehicle controller 100 .

In addition, while the vehicle controller 100 prohibits the DC/DC converter 200 from operating, if the vehicle controller 100 does not receive the wake-up command, it is determined in real time whether the front nacelle cover of the vehicle is closed, thereby further ensuring The integrity of the power-up function. In order to make the present invention more clearly understood by those skilled in the art, the charging control process of the low voltage battery is as shown in FIG.

According to the charging control system for a low voltage battery of a vehicle according to an embodiment of the present invention, the vehicle controller enters a low power consumption timing mode after the vehicle enters a stationary state, and starts timing, and when the time lapse reaches the stored wakeup time, The vehicle controller automatically wakes up, the vehicle controller detects the current voltage of the low voltage battery, and determines whether the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, and the current voltage of the low voltage battery is less than or equal to a preset value. The low battery voltage threshold controls the DC/DC converter to operate to charge the low voltage battery. Therefore, when the aging time reaches the waking time, the system determines whether the charging is performed by judging the current voltage of the low-voltage battery, so that charging can be performed according to the actual demand of the low-voltage battery, and the rest loss of the entire vehicle can be reduced.

A vehicle according to an embodiment of the present invention includes the charging control system for a low voltage battery of a vehicle according to any of the above embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the above terms It is not necessary to be directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A charging control method for a low voltage battery of a vehicle, characterized in that the vehicle comprises a vehicle controller, a DC/DC converter, a high voltage battery system and a vehicle body control unit, and the vehicle controller is respectively a body control unit, the DC/DC converter, and a battery manager in the high voltage battery system for converting a high voltage power outputted by a power battery in the high voltage battery system to Low piezoelectricity to supply the low voltage battery, the charging control method comprising the following steps:

After the vehicle enters a resting state, the vehicle controller enters a low power consumption timing mode and starts timing;

When the chronograph time reaches the wake-up time stored in the vehicle controller, the vehicle controller is woken up, the vehicle controller detects the current voltage of the low-voltage battery, and determines whether the current voltage of the low-voltage battery is Less than or equal to a preset low battery voltage threshold;

If the current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, the vehicle controller controls the DC/DC converter to operate to charge the low voltage battery.
The charging control method for a low-voltage battery for a vehicle according to claim 1, wherein when the vehicle controller controls the DC/DC converter to operate, the method further includes:

Determining, by the vehicle controller, whether the front nacelle cover of the vehicle is turned on according to a state of a front nacelle cover of the vehicle detected by the vehicle body control unit;

If it is determined that the front nacelle cover of the vehicle is open, the vehicle controller prohibits the DC/DC converter from operating.
The charging control method for a low-voltage battery for a vehicle according to claim 1 or 2, wherein when the DC/DC converter charges the low-voltage battery, the method further includes:

The vehicle controller acquires an operating current of the DC/DC converter, and determines whether an operating current of the DC/DC converter is less than a preset current threshold;

If the operating current of the DC/DC converter is less than a preset current threshold, the vehicle controller determines that the low voltage battery is fully charged and controls the DC/DC converter to stop operating.
The charging control method for a low-voltage battery for a vehicle according to claim 3, wherein after the charging of the low-voltage battery is completed, the vehicle controller controls the vehicle to be powered off, and according to the low-voltage battery The current voltage and the vehicle static loss of the vehicle calculate the time required to wake up the vehicle controller for the next round and store to update the wake-up time stored in the vehicle controller.
The charging control method for a low voltage battery of a vehicle according to claim 1, wherein when the current voltage of the low voltage battery is greater than a preset low battery voltage threshold, the vehicle controller is based on the low voltage The current voltage of the battery and the vehicle static loss of the vehicle are calculated to coexist with the time required to wake up the vehicle controller in the next round. Store to update the wake-up time stored in the vehicle controller.
A charging control method for a low voltage battery for a vehicle according to any one of claims 1 to 5, wherein, when the vehicle controller enters a low power consumption timing mode, if the vehicle controller Receiving a wake-up command, the vehicle controller controls the vehicle to enter an operation mode corresponding to the wake-up command, and controls the vehicle to be powered off after the end of the work mode corresponding to the wake-up command, and The preset wake-up time is acquired after the vehicle is powered off to update the wake-up time stored in the vehicle controller.
A charging control system for a low voltage battery of a vehicle, comprising: a vehicle controller, a DC/DC converter, a high voltage battery system, and a vehicle body control unit, wherein the vehicle controller and the vehicle body control unit respectively The DC/DC converter communicates with a battery manager in the high voltage battery system, the vehicle controller is connected to the low voltage battery, and the DC/DC converter is respectively associated with the low voltage battery and the The high voltage battery system is connected, wherein

The DC/DC converter is configured to convert high voltage power outputted by a power battery in the high voltage battery system into low voltage power to supply the low voltage battery;

The vehicle body control unit is configured to detect a state of a front nacelle cover of the vehicle;

The vehicle controller stores a wake-up time, and the vehicle controller enters a low-power timekeeping mode after the vehicle enters a resting state, and starts timing, and when the time-lapse reaches the stored wake-up time, The vehicle controller automatically wakes up, the vehicle controller detects a current voltage of the low voltage battery, and determines whether a current voltage of the low voltage battery is less than or equal to a preset low battery voltage threshold, and at the low voltage battery The DC/DC converter is controlled to operate to charge the low voltage battery when the current voltage is less than or equal to a preset low battery voltage threshold.
A charging control system for a low voltage battery for a vehicle according to claim 7, wherein said vehicle controller is further detected according to said vehicle body control unit when said DC/DC converter is controlled to operate The front nacelle state of the vehicle determines whether the front nacelle cover of the vehicle is open, and the vehicle controller prohibits the DC/DC converter from operating when the front nacelle cover of the vehicle is open.
A charging control system for a low voltage battery for a vehicle according to claim 7 or 8, wherein said vehicle controller further acquires when said DC/DC converter charges said low voltage battery Describe the operating current of the DC/DC converter, and determine whether the operating current of the DC/DC converter is less than a preset current threshold, and when the operating current of the DC/DC converter is less than a preset current threshold The vehicle controller determines that the low voltage battery is fully charged and controls the DC/DC converter to stop working.
A charging control system for a low voltage battery for a vehicle according to claim 9, wherein

After the charging of the low-voltage battery is completed, the vehicle controller controls the vehicle to be powered off, and calculates the next-round wake-up of the vehicle control according to the current voltage of the low-voltage battery and the vehicle static loss of the vehicle. The time required by the device is stored to update the wake-up time stored in the vehicle controller; or

When the current voltage of the low voltage battery is greater than a preset low battery voltage threshold, the vehicle controller is The current voltage of the low voltage battery and the vehicle static loss of the vehicle are calculated for the next time required to wake up the vehicle controller and stored to update the wake time stored in the vehicle controller.
A charging control system for a low voltage battery for a vehicle according to claim 7, wherein, when said vehicle controller enters a low power consumption timing mode, if said vehicle controller receives a wakeup command, The vehicle controller controls the vehicle to enter an operation mode corresponding to the wake-up command, and controls the vehicle to be powered off after the operation mode corresponding to the wake-up command ends, and after the vehicle is powered off Obtaining a preset wake-up time to update the wake-up time stored in the vehicle controller.
A vehicle characterized by comprising a charging control system for a low voltage battery for a vehicle according to any one of claims 7-11.