CN112428871A - Method and system for controlling charging of low-voltage storage battery, vehicle and storage medium - Google Patents
Method and system for controlling charging of low-voltage storage battery, vehicle and storage medium Download PDFInfo
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- CN112428871A CN112428871A CN201910788651.4A CN201910788651A CN112428871A CN 112428871 A CN112428871 A CN 112428871A CN 201910788651 A CN201910788651 A CN 201910788651A CN 112428871 A CN112428871 A CN 112428871A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention discloses a method and a system for controlling the charging of a low-voltage storage battery, a vehicle and a storage medium, wherein the method for controlling the charging of the low-voltage storage battery of a hybrid vehicle comprises the following steps: detecting an ignition switch gear, wherein the ignition switch gear comprises an ON gear and an OFF gear; collecting a voltage value of a low-voltage storage battery; judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value or not; if yes, determining a charging control strategy according to the ignition switch gear, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy. According to the method provided by the embodiment of the invention, when the hybrid vehicle is in the state of the ON gear or the OFF gear without high voltage, the power shortage prevention protection of the low-voltage storage battery can be realized, and the normal starting of the vehicle is ensured.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method for controlling charging of a low-voltage storage battery of a hybrid vehicle, a computer storage medium, a system for controlling charging of the low-voltage storage battery of the hybrid vehicle and the vehicle.
Background
In the related art, the protection measures against the power shortage of the low-voltage battery of the new energy vehicle include charging the low-voltage battery by controlling an output of a direct current converter (DCDC) when in a high-voltage state; when in the charging state, the low-voltage battery is also charged by controlling the DCDC. However, under the ON-range and OFF-range states where high voltage is not applied, no undervoltage protection measures for the low-voltage battery are available.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the present invention is to provide a method for controlling the charging of a low-voltage battery of a hybrid vehicle, which can implement power-deficit protection of the low-voltage battery when the hybrid vehicle is in an ON-range or OFF-range state without applying a high voltage, and ensure the normal starting of the vehicle.
It is another object of the present invention to provide a computer-readable storage medium.
It is a further object of the present invention to provide a system for controlling the charging of a low-voltage battery of a hybrid vehicle.
The fourth purpose of the invention is to provide a vehicle.
In order to solve the above problem, a method of controlling charging of a low-voltage battery of a hybrid vehicle according to an embodiment of a first aspect of the invention includes: detecting an ignition switch gear, wherein the ignition switch gear comprises an ON gear and an OFF gear; collecting a voltage value of a low-voltage storage battery; judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value or not; if yes, determining a charging control strategy according to the ignition switch gear, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy.
According to the method for controlling the charging of the low-voltage storage battery of the hybrid vehicle, the charging control strategy is determined through the ignition switch gear, namely, the protection measure for preventing the low-voltage storage battery from being lack of power is set corresponding to the ON gear or the OFF gear, if the voltage value of the low-voltage storage battery is smaller than the set voltage threshold, the low-voltage storage battery is charged by adopting the corresponding charging strategy, compared with the protection measure for preventing the lack of power in the prior art, the method provided by the embodiment of the invention can realize the protection for preventing the low-voltage storage battery from being lack of power when the hybrid vehicle is in the ON gear and the OFF gear which are not high in voltage, the defects in the prior art are made up, and the normal starting of.
In some embodiments, determining a charge control strategy based on the ignition switch gear and controlling a charging device to charge the low-voltage battery based on the charge control strategy comprises: detecting that the ignition switch is in an ON gear; the vehicle body controller acquires the residual electric quantity of the power battery; the vehicle body controller judges whether the residual electric quantity of the power battery is larger than a set electric quantity threshold value or not; if yes, the vehicle body controller controls the combination of a main contactor of a battery management system and controls the output of a DCDC converter, so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches the set voltage threshold. According to the charging control strategy of the low-voltage storage battery under the ON gear, namely under the condition that a driver participates, the method that the DCDC converter is adopted to charge the low-voltage storage battery does not start the engine, and the condition that the low-voltage storage battery is insufficient in power due to long-time consumption of low-voltage load by the driver, so that the vehicle cannot be normally used is avoided.
In some embodiments, determining a charge control strategy based on the ignition switch gear and controlling a charging device to charge the low-voltage battery based on the charge control strategy comprises: detecting that the ignition switch is in an OFF gear; the low-voltage battery controller sends a first awakening command to the vehicle body controller; the vehicle body controller receives the first awakening command and then awakens the vehicle body controller, sends a second awakening command to the battery manager to obtain the residual electric quantity of the power battery, controls the main contactor of the battery manager to be combined when the residual electric quantity of the power battery is judged to be larger than or equal to a set electric quantity threshold value, and controls the DCDC converter to output so that the power battery charges the low-voltage storage battery. According to the charging control strategy of the low-voltage storage battery under the OFF gear, namely, the residual electric quantity of the power battery is distinguished, so that the low-voltage storage battery is controlled, the strategy of starting and generating electricity by an engine is avoided, the oil consumption is reduced, and the normal starting of the vehicle is ensured.
In some embodiments, determining a charging control strategy according to the ignition switch gear and controlling a charging device to charge the low-voltage battery according to the charging control strategy further comprises: the vehicle body controller judges that the residual electric quantity of the power battery is smaller than the set electric quantity threshold value, controls the whole vehicle controller to start and sends a power-sending request instruction to the whole vehicle controller; and the vehicle control unit controls the engine to operate according to the power generation request instruction so as to charge the power battery and the low-voltage storage battery.
In some embodiments, it is determined that the voltage of the low-voltage battery reaches the set voltage threshold, the vehicle controller controls the engine to stop, and after the engine stops, the vehicle controller and the vehicle body controller both enter a sleep state, so that consumption of low-voltage loads is reduced, and power consumption is reduced.
In some embodiments, before the vehicle body controller controls the vehicle control unit to start, the method further includes: the vehicle body controller acquires an engine state parameter and a whole vehicle anti-theft parameter; the vehicle body controller judges whether the starting condition of the engine is met or not according to the engine state parameter and the whole vehicle anti-theft parameter; and if so, controlling the whole vehicle controller to start by the vehicle body controller.
A computer-readable storage medium of an embodiment of the second aspect of the invention has stored thereon a computer program that, when executed, implements the method of controlling charging of a low-voltage battery of a hybrid vehicle described in the above-described embodiment.
A system for controlling charging of a low-voltage battery of a hybrid vehicle according to an embodiment of a third aspect of the invention includes: the detection device is used for detecting ignition switch gears, wherein the ignition switch gears comprise an ON gear and an OFF gear; the acquisition device is used for acquiring the voltage value of the low-voltage storage battery; and the charging control subsystem is used for judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value or not, determining a charging control strategy according to the ignition switch gear when the voltage value of the low-voltage storage battery is smaller than the set voltage threshold value, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy.
According to the system for controlling the charging of the low-voltage storage battery of the hybrid vehicle, the corresponding charging control strategy is determined according to the gear state of the ignition switch, and compared with the power shortage prevention protection measures in the prior art, the system provided by the embodiment of the invention can realize power shortage prevention protection ON the low-voltage storage battery when the hybrid vehicle is in the ON gear state and the OFF gear state without high voltage, so that the normal starting of the vehicle is ensured.
In some embodiments, the charge control subsystem comprises a vehicle body controller, a battery manager and a DCDC converter, the battery manager comprises a main contactor, wherein the main contactor is used for controlling the output of the power battery; the DCDC converter is arranged between the power battery and the low-voltage storage battery; the vehicle body controller is used for acquiring the residual electric quantity of the power battery when detecting that the ignition switch is in an ON gear, controlling the main contactor to be combined when the residual electric quantity of the power battery is larger than a set electric quantity threshold value, and controlling the DCDC converter to output so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches the set voltage threshold value.
In some embodiments, the charging control subsystem comprises a low-voltage battery controller, a vehicle body controller, a vehicle control unit, a battery manager and a DCDC converter, the battery manager comprises a main contactor, wherein the main contactor is used for controlling the output of the power battery; the DCDC converter is arranged between the power battery and the low-voltage storage battery; the low-voltage battery controller is used for sending a first awakening command to the automobile body controller when the ignition switch is in an OFF gear; the vehicle body controller is used for receiving the first awakening command, then awakening the vehicle body controller, sending a second awakening command to the battery manager to obtain the residual electric quantity of the power battery, controlling the main contactor to be combined when the residual electric quantity of the power battery is judged to be larger than or equal to a set electric quantity threshold value, and controlling the DCDC converter to output so that the power battery charges the low-voltage storage battery.
In some embodiments, the vehicle body controller is further configured to control the vehicle control unit to start up and send a power transmission request instruction to the vehicle control unit when it is determined that the remaining power of the power battery is less than the set power threshold; and the vehicle control unit is used for controlling the engine to operate according to the power generation request instruction so as to charge the power battery and the low-voltage storage battery.
In some embodiments, the vehicle controller is further configured to control the engine to stop when the voltage of the low-voltage battery reaches the set voltage threshold, and after the engine stops, the vehicle controller and the vehicle body controller both enter a sleep state.
In some embodiments, the vehicle body controller is further configured to, before controlling the vehicle controller to start, acquire an engine state parameter and a vehicle theft prevention parameter, determine whether an engine start condition is met according to the engine state parameter and the vehicle theft prevention parameter, and if so, control the vehicle controller to start.
A vehicle according to a fourth aspect of the present invention includes: power batteries, low-voltage storage batteries and engines; and the system for controlling the charging of the low-voltage battery of the hybrid vehicle described in the above embodiment.
According to the vehicle provided by the embodiment of the invention, by adopting the control hybrid vehicle low-voltage battery charging system provided by the embodiment, under the ON gear and the OFF gear with high voltage not electrified, the power shortage prevention protection ON the low-voltage battery can be realized, and the normal starting of the vehicle is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a connection block diagram of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method of controlling charging of a low-voltage battery of a hybrid vehicle according to an embodiment of the invention;
fig. 3 is a flowchart of a charge control strategy for a low-voltage battery in the ON range according to an embodiment of the invention;
FIG. 4 is a flow chart of low voltage battery charging in the ON range according to one embodiment of the present invention;
FIG. 5 is a flow chart of a charge control strategy for a low voltage battery in OFF range according to an embodiment of the present invention;
FIG. 6 is a flow chart of low voltage battery charging in OFF range according to one embodiment of the present invention;
fig. 7 is a block diagram of a structure for controlling a low-voltage battery charging system of a hybrid vehicle according to an embodiment of the present invention;
fig. 8 is a block diagram of a structure for controlling a low-voltage battery charging system of a hybrid vehicle according to another embodiment of the present invention;
fig. 9 is a block diagram of a vehicle according to an embodiment of the invention.
Reference numerals:
a vehicle 1000;
controlling a hybrid vehicle low-voltage battery system 1; a low-voltage battery 2; a power battery 3; an engine 4;
a detection device 10; an acquisition device 20; a charge control subsystem 30;
a vehicle body controller 300; a battery manager 301; a DCDC converter 302; a vehicle control unit 303; a low-voltage battery controller 304;
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
Fig. 1 is a diagram of a vehicle connection of a vehicle according to an embodiment of the present invention, in which a high-voltage network includes a battery manager and a DCDC converter, a power network includes a vehicle body controller and a vehicle controller, which are connected by a relay, and a low-voltage network includes a low-voltage battery controller and a low-voltage load, and the three groups of CAN networks are controlled by a master gateway.
In some cases, when the vehicle is in a locked and dormant state, or when a driver may stop and turn ON a car headlight for a long time or consume the electric quantity of the low-voltage battery by using multimedia and the like under an ON gear, the low-voltage battery supplies the electric quantity to a low-voltage load, but the low-voltage battery is certainly lack of the electric quantity due to long-time consumption, and the vehicle can not be started normally. In addition, in the OFF range, a VCU (Vehicle Control Unit) or a BCM (body Control module) detects the low-voltage battery capacity in real time, and the low-voltage capacity loss must be increased.
In order to solve the above problems, a method for controlling charging of a low-voltage battery of a hybrid vehicle according to an embodiment of the first aspect of the present invention will be described below with reference to the accompanying drawings, according to which power shortage protection of the low-voltage battery is achieved while the hybrid vehicle is in an ON-range and OFF-range state without high voltage application, and normal starting of the vehicle is ensured.
Fig. 1 shows a flowchart of a method for controlling charging of a low-voltage battery of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 1, the method of controlling the charging of the low-voltage battery of the hybrid vehicle according to the embodiment of the present invention includes at least steps S1 to S4, each of which is explained below.
And step S1, detecting an ignition switch gear, wherein the ignition switch gear comprises an ON gear and an OFF gear.
Specifically, the ignition switch outputs an ignition switch signal according to the operation of a driver, and sends the ignition switch signal to the entire vehicle CAN, and the vehicle body controller CAN obtain the ignition switch signal through a CAN line, and judge whether the ignition switch is in the gear, for example, whether the ignition switch is in the ON gear or the OFF gear, and the high voltage of the vehicle is not electrified in the ON gear and the OFF gear.
And step S2, collecting the voltage value of the low-voltage storage battery.
Specifically, the voltage value of the low-voltage battery may be monitored by the low-voltage battery controller and transmitted to the vehicle CAN line.
In step S3, it is determined whether the voltage value of the low-voltage battery is smaller than a set voltage threshold.
Specifically, the voltage value of the low-voltage battery is too low, which will cause the vehicle to be unable to start normally, so a voltage threshold value is set, which may be the minimum voltage value of the low-voltage battery that ensures that the vehicle can start normally. When the voltage value of the low-voltage storage battery is smaller than the set voltage threshold value, in order to ensure that the vehicle is started normally, power shortage prevention protection needs to be provided for the low-voltage storage battery, namely, the step S4 is carried out, otherwise, the low-voltage storage battery does not need to be charged.
And step S4, determining a charging control strategy according to the gear of the ignition switch, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy.
Specifically, the voltage value of the low-voltage storage battery is determined to be smaller than a set voltage threshold value through BCM detection and judgment, and then the charging device is controlled to charge the low-voltage storage battery by adopting a corresponding charging control strategy according to different ignition switch gear states. For example, if the ignition switch is in the ON position, the BCM, the VCU, the low-voltage battery controller and the like all participate in the work, and the low-voltage battery can be charged by the power battery; if the low-voltage storage battery is in an OFF gear, the BCM, the VCU and the like are in a dormant state, and the corresponding modules participate in charging control through awakening, so that the low-voltage storage battery is charged, and the power shortage of the low-voltage storage battery is prevented.
According to the method for controlling the charging of the low-voltage storage battery of the hybrid vehicle, the charging control strategy is determined through the ignition switch gear, namely, the protection measure for preventing the low-voltage storage battery from being lack of power is set corresponding to the ON gear or the OFF gear.
The following further describes the process of controlling the charging device to charge the low-voltage battery according to the corresponding charging control strategy when the ignition switch of the vehicle is in the ON gear and the OFF gear respectively.
When the vehicle is in the ON gear state, as shown in fig. 2, the charging control strategy is determined according to the ignition shift position, and the charging device is controlled to charge the low-voltage storage battery according to the charging control strategy, including steps S10-S13.
In step S10, it is detected that the ignition switch is in the ON position.
In step S11, the vehicle body controller obtains the remaining capacity of the power battery.
Step S12, the vehicle body controller judges whether the residual electric quantity of the power battery is larger than the set electric quantity threshold value, if yes, the step S13 is executed; if not, no processing is performed.
And step S13, the vehicle body controller controls the combination of the main contactor of the battery management system and controls the output of the DCDC converter so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches a set voltage threshold.
Specifically, when the ignition switch is detected to be in an ON gear, the BCM, the VCU, the low-voltage battery controller and the like all participate in work, at this time, the high voltage of the whole vehicle is not electrified, the main contactor of the power battery is in a disconnected state, and the DCDC converter is not opened. Further judging whether the voltage value of the current low-voltage storage battery is smaller than a set voltage threshold value or not by the BCM, if so, not performing any processing, if not, judging whether the residual electric quantity SOC of the power battery is larger than the set electric quantity threshold value again, and if so, considering that the ON gear of the vehicle appears under the condition that a driver participates, and not performing any processing; when the SOC of the power battery is judged to be larger than the set threshold value, the BCM controls a main contactor of a BMS (battery management system) to be combined, a DCDC converter is opened, the power battery outputs, the low-voltage storage battery is charged through the DCDC converter, and the main contactor of the BMS and the DCDC converter are disconnected until the voltage of the low-voltage storage battery reaches the set voltage threshold value.
The following describes an example of a charging control strategy of a low-voltage battery of a whole vehicle in an ON gear according to the accompanying drawings, and a detailed flow is shown in fig. 3:
s100: and judging whether the vehicle is in an ON gear state or not. If yes, executing S102; if not, S101 is executed.
S101: and other logic.
S102: and judging whether the current voltage of the low-voltage storage battery is smaller than a voltage threshold value. If yes, S103 is executed, otherwise, the process ends.
S103: and judging whether the SOC of the power battery is greater than the electric quantity threshold value. If yes, executing S104; if not, the process is ended.
S104: the BCM opens the main contactor and the DCDC converter, and S105 is performed.
S105: and judging whether the voltage of the low-voltage storage battery is greater than a voltage threshold value. If yes, executing S106; if not, S104 is executed.
S106: the main contactor and the DCDC converter are closed.
When the whole vehicle is in the OFF gear, as shown in FIG. 4, a charging control strategy is determined according to the ignition switch gear, and the charging device is controlled to charge the low-voltage storage battery according to the charging control strategy, including steps S20-S22.
In step S20, it is detected that the ignition switch is in the OFF position.
In step S21, the low-voltage battery controller sends a first wake-up command to the body controller.
And step S22, the vehicle body controller receives the first awakening command and then awakens the vehicle body controller, and sends a second awakening command to the battery manager to obtain the residual electric quantity of the power battery, and when the residual electric quantity of the power battery is judged to be greater than or equal to the set electric quantity threshold value, the vehicle body controller controls the main contactor of the battery manager to be combined and controls the DCDC converter to output, so that the power battery charges the low-voltage storage battery.
Specifically, when the vehicle is in the OFF range, the BCM, the VCU, the low-voltage battery controller, and the like are all in the sleep state, and the low-voltage battery controller still detects the battery voltage. When the voltage of the low-voltage storage battery is detected to be lower than a set voltage threshold value, the low-voltage storage battery controller wakes up the BCM by sending a CAN message, after the BCM works, a second wake-up command is sent to wake up a main contactor of the high-voltage battery manager to participate in the work so as to obtain and detect the residual electric quantity of the power battery, when the SOC of the power battery is determined to be larger than the set electric quantity threshold value, an engine does not need to be started, and the DCDC converter directly charges the low-voltage storage battery.
Further, when the remaining capacity of the power battery is insufficient to charge the low-voltage battery, in the embodiment, as shown in fig. 4, the charging control strategy of the low-voltage battery in the OFF gear further includes step S23 and step S24.
Step S23, the vehicle body controller judges that the residual electric quantity of the power battery is smaller than a set electric quantity threshold value, controls the vehicle controller to start, and sends a power generation request instruction to the vehicle controller;
and step S24, the vehicle control unit controls the engine to operate according to the power generation request instruction so as to charge the power battery and the low-voltage storage battery. When the residual capacity of the power battery is low, the engine is started to charge the low-voltage storage battery so as to prevent the vehicle from being started normally due to the low-voltage storage battery power shortage, and the engine cannot be started even if the vehicle is started.
Before the BCM controls the VCU to start, the BCM firstly acquires engine state parameters and vehicle anti-theft parameters and judges whether the conditions of starting the engine, such as the engine oil level state, the coolant state, the vehicle engine compartment cover state, the vehicle door window state, the vehicle locking state and other information parameters of the vehicle are met or not according to the acquired parameters, and if the parameters are met, the BCM controls the VCU to start.
Specifically, when the BCM detects that the SOC of the power battery is smaller than a set electric quantity threshold, the BCM can judge whether information of engine state parameters and vehicle anti-theft parameters, such as information parameters of an engine oil level state, a coolant state, a vehicle engine compartment cover state, a vehicle door window and vehicle locking state of a vehicle, of the vehicle is satisfied, if so, the BCM needs to enable the VCU to participate in work by opening a main relay of the VCU, and simultaneously opens a main contactor and a DCDC converter of a battery manager, the VCU sends an engine starting instruction after receiving an instruction of BCM power generation, and the VCU controls the power generation power of the engine and the engine rotation speed; when the SOC of the power battery and the voltage of the low-voltage storage battery are both larger than the set threshold value, the BCM stops sending a power generation instruction, the engine is extinguished, and the whole vehicle continues to enter a dormant state. When the SOC of the power battery is larger than the set electric quantity threshold value, the BCM opens a main contactor and a DCDC converter of the battery manager without starting the engine, and the low-voltage storage battery is charged through the DCDC converter; and when the voltage of the low-voltage storage battery is higher than the set voltage threshold, the BCM closes the BMS main contactor and the DCDC converter, and the whole vehicle continuously enters a dormant state.
After the electric quantity of the low-voltage storage battery is higher than a set voltage threshold value, the BCM closes the DCDC converter or the engine, and the low-voltage storage battery charging protection logic is finished.
The following further illustrates the procedure of the charging control strategy of the low-voltage battery when the whole vehicle is in the OFF gear according to the attached drawings, and the detailed flow is shown in fig. 6:
s200: it is determined whether the vehicle is in the OFF range state. If yes, executing S202; if not, S201 is executed.
S201: and other logic.
S202: and judging whether the current voltage of the low-voltage storage battery is smaller than a voltage threshold value. If yes, go to S203; if not, the process is ended.
S203: and judging whether the SOC of the power battery is greater than the electric quantity threshold value. If yes, executing S204; if not, go to S207.
S204: the BCM opens the main contactor and the DCDC converter, and S205 is performed.
S205: and judging whether the voltage of the low-voltage storage battery is greater than a voltage threshold value. If yes, go to S206; if not, go to S204.
S206: and closing the main contactor and the DCDC converter, and sleeping the whole vehicle.
S207: and the BCM judges whether conditions such as engine oil level, cooling liquid, vehicle locking and the like are met. If yes, go to step S208; if not, the process is ended.
S208: the BCM opens the VCU main contactor and issues a charging command, opens the BMS main contactor and the DCDC converter, and performs S209.
S209: the VCU controls engine start and executes S210.
S210: and judging whether the SOC of the power battery is greater than the electric quantity threshold value and the low-voltage storage battery is greater than the voltage threshold value. If yes, go to S211; if not, go to step S208.
S211: and stopping sending the charging instruction, and sleeping the whole vehicle.
In summary, according to the method for controlling charging of the low-voltage battery of the hybrid vehicle of the embodiment of the invention, under the state of the ON gear or the OFF gear without high voltage, corresponding low-voltage battery power shortage prevention protection measures are set, so that the situation that the vehicle cannot be normally started due to power shortage of the low-voltage battery caused by long-time consumption of the low-voltage load by a driver or long-time storage of the vehicle can be avoided.
An embodiment of a second aspect of the invention provides a computer-readable storage medium having stored thereon a computer program that, when executed, implements the method of controlling charging of a low-voltage battery of a hybrid vehicle of the above-described embodiments.
A control hybrid vehicle low-voltage battery charging system proposed in a third aspect of the embodiment of the invention is described below with reference to fig. 7.
Fig. 7 is a block diagram of a low-voltage battery charging system for controlling a hybrid vehicle according to an embodiment of the present invention. In the embodiment, the control hybrid vehicle low-voltage battery charging system 1 comprises a detection device 10, an acquisition device 20 and a charging control subsystem 30.
The detection device 10 is used for detecting the ignition switch gear, wherein the ignition switch gear comprises an ON gear and an OFF gear.
And the acquisition device 20 is used for acquiring the voltage value of the low-voltage storage battery.
And the charging control subsystem 30 is used for judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value, determining a charging control strategy according to the ignition switch gear when the voltage value of the low-voltage storage battery is smaller than the set voltage threshold value, and controlling the charging device to charge the low-voltage storage battery according to the charging control strategy.
According to the system 1 for controlling the charging of the low-voltage storage battery of the hybrid vehicle, the corresponding charging control strategy is determined according to the state of the ignition switch gear, and compared with the power shortage prevention protection measures in the prior art, the system 1 can realize the power shortage prevention protection of the low-voltage storage battery when the vehicle is in the ON gear state and the OFF gear state without high voltage, and ensure the normal starting of the vehicle.
In some embodiments, as shown in fig. 7, the charge control subsystem 30 includes a body controller 300, a battery manager 301, and a DCDC converter 302, the battery manager 301 including a master contactor, wherein the master contactor in the battery manager 301 is used to control the output of the power battery; a DCDC converter 302 provided between the power battery and the low-voltage battery; and the vehicle body controller 300 is configured to obtain the remaining power of the power battery when detecting that the ignition switch is in the ON position, control the main contactor to be combined when the remaining power of the power battery is greater than the set power threshold, and control the DCDC converter to output so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches the set voltage threshold.
Through the charging control subsystem 30 of the embodiment of the invention, namely, the corresponding charging control strategy under the ON gear is adopted, the condition of low-voltage storage battery power shortage caused by long-time consumption of low-voltage load is avoided, the normal starting of the vehicle can be ensured, and meanwhile, because the state of participation of a driver under the ON gear is realized, the DCDC converter is directly adopted for charging without starting the engine, and unnecessary panic to drivers and passengers can also be avoided.
In some embodiments, as shown in fig. 8, the charging control subsystem 30 includes a low-voltage battery controller 304, a body controller 300, a battery manager 301, a DCDC converter 302, and a vehicle control unit 303, and the battery manager 301 includes a main contactor, wherein the main contactor in the battery manager 301 is used for controlling the output of the power battery. And a DCDC converter 302 provided between the power battery and the low-voltage battery. And the low-voltage battery controller 304 is used for sending a first wake-up command to the vehicle body controller 300 when the ignition switch is in an OFF gear. And the vehicle body controller 300 is configured to wake up the vehicle body after receiving the first wake-up command, and send a second wake-up command to the battery manager 301 to obtain the remaining power of the power battery, and when it is determined that the remaining power of the power battery is greater than or equal to the set power threshold, control the main contactor to be combined, and control the DCDC converter 302 to output the command, so that the power battery charges the low-voltage storage battery.
Further, the vehicle body controller 300 is further configured to control the vehicle controller 303 to start up and send a power generation request instruction to the vehicle controller 303 when it is determined that the remaining power of the power battery is less than the set power threshold; and a vehicle control unit 303, configured to control operation of the engine according to the power generation request instruction, so as to charge the power battery and the low-voltage battery.
Further, the vehicle control unit 303 is further configured to control the engine to stop when the voltage of the low-voltage battery reaches a set voltage threshold, and after the engine stops, the vehicle control unit 303 and the vehicle body controller 300 both enter a sleep state.
In some embodiments, the vehicle body controller 300 is further configured to, before controlling the vehicle controller 303 to start, obtain an engine state parameter and a vehicle theft prevention parameter, determine whether an engine start condition is met according to the engine state parameter and the vehicle theft prevention parameter, and if so, control the vehicle controller 303 to start.
According to the charging control subsystem 30 of the above embodiment, by adopting the corresponding charging control strategy in the OFF gear, that is, performing the differentiated control according to the SOC electric quantity of the power battery, the consumption of the low-voltage load can be reduced, the execution of the engine starting power generation strategy can be avoided as much as possible, and the fuel consumption can be reduced.
A fourth aspect embodiment of the invention provides a vehicle, as shown in fig. 9, the vehicle 1000 including a power battery 3, a low-voltage battery 2, and an engine 4, and the control hybrid vehicle low-voltage battery charging system 1 of the above-described embodiment.
According to the vehicle 1000 of the embodiment of the invention, by adopting the control hybrid vehicle low-voltage battery charging system 1 of the embodiment, the power shortage protection ON the low-voltage battery under the ON gear and the OFF gear without power supply at high voltage can be realized, and the normal starting of the vehicle is ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (14)
1. A method of controlling charging of a low-voltage battery of a hybrid vehicle, the method comprising:
detecting an ignition switch gear, wherein the ignition switch gear comprises an ON gear and an OFF gear;
collecting a voltage value of a low-voltage storage battery;
judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value or not;
if yes, determining a charging control strategy according to the ignition switch gear, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy.
2. The method of controlling charging of a low voltage battery of a hybrid vehicle according to claim 1, wherein determining a charge control strategy according to the ignition shift position and controlling a charging device to charge the low voltage battery according to the charge control strategy comprises:
detecting that the ignition switch is in an ON gear;
the vehicle body controller acquires the residual electric quantity of the power battery;
the vehicle body controller judges whether the residual electric quantity of the power battery is larger than a set electric quantity threshold value or not;
if yes, the vehicle body controller controls the combination of a main contactor of a battery management system and controls the output of a DCDC converter, so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches the set voltage threshold.
3. The method of controlling charging of a low voltage battery of a hybrid vehicle according to claim 1, wherein determining a charge control strategy according to the ignition shift position and controlling a charging device to charge the low voltage battery according to the charge control strategy comprises:
detecting that the ignition switch is in an OFF gear;
the low-voltage battery controller sends a first awakening command to the vehicle body controller;
the vehicle body controller receives the first awakening command and then awakens the vehicle body controller, sends a second awakening command to the battery manager to obtain the residual electric quantity of the power battery, controls the main contactor of the battery manager to be combined when the residual electric quantity of the power battery is judged to be larger than or equal to a set electric quantity threshold value, and controls the DCDC converter to output so that the power battery charges the low-voltage storage battery.
4. The method of controlling charging of a low voltage battery of a hybrid vehicle according to claim 3, wherein a charge control strategy is determined according to the ignition shift position, and a charging device is controlled to charge the low voltage battery according to the charge control strategy, further comprising:
the vehicle body controller judges that the residual electric quantity of the power battery is smaller than the set electric quantity threshold value, controls the whole vehicle controller to start and sends a power-sending request instruction to the whole vehicle controller;
and the vehicle control unit controls the engine to operate according to the power generation request instruction so as to charge the power battery and the low-voltage storage battery.
5. The method of controlling charging of a low-voltage battery of a hybrid vehicle according to claim 4, further comprising:
determining that the voltage of the low-voltage storage battery reaches the set voltage threshold value, and controlling the engine to stop by the vehicle control unit; and the number of the first and second groups,
and after the engine stops, the vehicle controller and the vehicle body controller both enter a dormant state.
6. The method of controlling charging of a low-voltage battery of a hybrid vehicle according to claim 4, further comprising, before the vehicle body controller controls the vehicle controller to start up:
the vehicle body controller acquires an engine state parameter and a whole vehicle anti-theft parameter;
the vehicle body controller judges whether the starting condition of the engine is met or not according to the engine state parameter and the whole vehicle anti-theft parameter;
and if so, controlling the whole vehicle controller to start by the vehicle body controller.
7. A computer-readable storage medium, on which a computer program is stored, characterized in that said computer program, when executed, implements a method of controlling the charging of a low-voltage battery of a hybrid vehicle according to any one of claims 1 to 6.
8. A system for controlling charging of a low voltage battery of a hybrid vehicle, said system comprising:
the detection device is used for detecting ignition switch gears, wherein the ignition switch gears comprise an ON gear and an OFF gear;
the acquisition device is used for acquiring the voltage value of the low-voltage storage battery;
and the charging control subsystem is used for judging whether the voltage value of the low-voltage storage battery is smaller than a set voltage threshold value or not, determining a charging control strategy according to the ignition switch gear when the voltage value of the low-voltage storage battery is smaller than the set voltage threshold value, and controlling a charging device to charge the low-voltage storage battery according to the charging control strategy.
9. The system of claim 8, wherein the charge control subsystem includes a body controller, a battery manager, and a DCDC converter, the battery manager including a main contactor, wherein,
the main contactor is used for controlling the output of the power battery;
the DCDC converter is arranged between the power battery and the low-voltage storage battery;
the vehicle body controller is used for acquiring the residual electric quantity of the power battery when detecting that the ignition switch is in an ON gear, controlling the main contactor to be combined when the residual electric quantity of the power battery is larger than a set electric quantity threshold value, and controlling the DCDC converter to output so that the power battery charges the low-voltage storage battery until the voltage of the low-voltage storage battery reaches the set voltage threshold value.
10. The system of controlling charging of a low voltage battery of a hybrid vehicle of claim 8, wherein the charge control subsystem includes a low voltage battery controller, a body controller, a vehicle control unit, a battery manager, and a DCDC converter, the battery manager including a main contactor, wherein,
the main contactor is used for controlling the output of the power battery;
the DCDC converter is arranged between the power battery and the low-voltage storage battery;
the low-voltage battery controller is used for sending a first awakening command to the automobile body controller when the ignition switch is in an OFF gear;
the vehicle body controller is used for receiving the first awakening command, then awakening the vehicle body controller, sending a second awakening command to the battery manager to obtain the residual electric quantity of the power battery, controlling the main contactor to be combined when the residual electric quantity of the power battery is judged to be larger than or equal to a set electric quantity threshold value, and controlling the DCDC converter to output so that the power battery charges the low-voltage storage battery.
11. The system for controlling charging of a low-voltage battery for a hybrid vehicle according to claim 10,
the vehicle body controller is further used for controlling the vehicle controller to start and sending a power generation request instruction to the vehicle controller when the residual electric quantity of the power battery is judged to be smaller than the set electric quantity threshold value;
and the vehicle control unit is used for controlling the engine to operate according to the power generation request instruction so as to charge the power battery and the low-voltage storage battery.
12. The system for controlling charging of a low-voltage battery for a hybrid vehicle according to claim 11,
the vehicle control unit is further used for controlling the engine to stop when the voltage of the low-voltage storage battery reaches the set voltage threshold;
and after the engine stops, the vehicle controller and the vehicle body controller both enter a dormant state.
13. The system for controlling charging of a low-voltage battery for a hybrid vehicle according to claim 11,
the vehicle body controller is further used for acquiring an engine state parameter and a vehicle anti-theft parameter before controlling the vehicle controller to start, judging whether an engine starting condition is met or not according to the engine state parameter and the vehicle anti-theft parameter, and controlling the vehicle controller to start if the engine starting condition is met.
14. A vehicle, characterized by comprising:
power batteries, low-voltage storage batteries and engines;
a system for controlling the charging of a low-voltage battery of a hybrid vehicle as claimed in any one of claims 8 to 13.
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