Vehicle control method and device, vehicle and computer readable storage medium

Abstract

The invention provides a vehicle control method and device, a vehicle and a computer readable storage medium, the method is applied to a battery management system of the vehicle, and the method comprises the steps that under the condition that the vehicle is in a voltage control mode, the working state of a battery pack is obtained; wherein when the vehicle is in the voltage control mode, the vehicle starts an engine, the engine drives a power generation system to operate, the power generation system supplies power to a driving motor, the working state is used for representing whether a battery pack can provide high-voltage electricity for a high-voltage load of the vehicle or not, and the high-voltage load comprises the driving motor; according to the working state, whether the vehicle meets the switching condition of switching from the voltage control mode to the high-voltage control mode or not is judged; when the vehicle is in a high-voltage control mode, power is supplied to the driving motor through the battery pack; and switching the vehicle from the voltage control mode to the high-voltage control mode under the condition that the switching condition is met. The battery pack is preferentially used for supplying power to the driving motor, so that the oil consumption of the vehicle is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a vehicle control method, a device, a vehicle, and a computer-readable storage medium in the field of vehicles. Background Art

[0002] Hybrid vehicles can use the engine and drive motor as power sources. During the operation of a hybrid vehicle, if it is detected that the battery pack cannot provide high voltage electricity for the vehicle's high voltage load, in order to ensure safety and protect the battery pack and other key components, the vehicle will cut off the power output of the battery pack, so that the vehicle's drive motor will not be powered and the vehicle will enter voltage control mode.

[0003] At present, when the vehicle is in voltage control mode, the vehicle is mainly driven by the engine. When it has been detected that the vehicle meets the requirements for switching from voltage control mode to high-voltage control mode, it is necessary to detect that the vehicle first performs a power-off operation and then performs a power-on operation, that is, the vehicle will be switched from voltage control mode to high-voltage control mode only after the vehicle is powered on again. From this point of view, when it has been detected that the vehicle meets the requirements for switching from voltage control mode to high-voltage control mode, it means that the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, but because the vehicle has not experienced the operation of powering off and then powering on, the vehicle cannot switch to high-voltage control mode, and the vehicle remains in voltage control mode, that is, the engine is always used to drive the vehicle, thereby increasing the fuel consumption of the vehicle. Summary of the invention

[0004] The present application provides a vehicle control method, device, vehicle and computer-readable storage medium. The present application implements that when a hybrid vehicle is running in a voltage control mode, if it is detected that the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, the vehicle is switched from the voltage control mode to the high-voltage control mode, and the vehicle is driven by the drive motor. This implements that when the battery pack is able to provide high voltage electricity for the drive motor, the battery pack is preferentially used to power the drive motor so that the drive motor drives the vehicle, which not only reduces the fuel consumption of the vehicle, but also improves the utilization rate of the battery pack.

[0005] In a first aspect, a vehicle control method is provided, which is applied to a battery management system of a vehicle, the method comprising: when the vehicle is in a voltage control mode, obtaining the working state of a battery pack; wherein, when the vehicle is in the voltage control mode, the vehicle starts an engine, and the engine drives a power generation system to operate, and the power generation system is used to power a drive motor so that the drive motor drives the vehicle, and the working state is used to characterize whether the battery pack can provide high voltage electricity to a high voltage load of the vehicle, and the high voltage load includes a drive motor; according to the working state, determining whether the vehicle meets the switching condition for switching from the voltage control mode to the high voltage control mode; wherein, when the vehicle is in the high voltage control mode, the battery pack is used to power the drive motor so that the drive motor drives the vehicle; and when the switching condition is met, switching the vehicle from the voltage control mode to the high voltage control mode.

[0006] In the embodiment of the present application, by adopting a technical solution of detecting the working status of the battery pack in real time when the vehicle is in the voltage control mode, and timely switching the vehicle from the voltage control mode to the high-voltage control mode when it is determined that the vehicle meets the switching conditions for switching from the voltage control mode to the high-voltage control mode according to the working status of the battery pack, it is achieved that when the hybrid vehicle is running in the voltage control mode, if it is detected that the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, the vehicle is switched from the voltage control mode to the high-voltage control mode, and the battery pack supplies power to the drive motor so that the drive motor drives the vehicle. This achieves that when the battery pack is able to provide high voltage electricity to the high-voltage load, the battery pack is preferentially used to supply power to the drive motor so that the drive motor drives the vehicle, which not only reduces the fuel consumption of the vehicle, but also improves the utilization rate of the battery pack.

[0007] In combination with the first aspect, in certain possible implementations, switching the vehicle from the voltage control mode to the high-voltage control mode includes: determining whether the high-voltage load of the vehicle is in an abnormal state; wherein the battery pack provides high voltage electricity to the high-voltage load; if the high-voltage load is not in an abnormal state, controlling the main relay between the battery pack and the high-voltage load to close, so as to switch the voltage control mode to the high-voltage control mode.

[0008] In the embodiment of the present application, when the vehicle switches from the voltage control mode to the high-voltage control mode, it is first determined whether the high-voltage load of the vehicle is in a normal working state. If the high-voltage load is not in an abnormal state, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode. This can ensure that the high-voltage load operates stably without problems such as short circuit, leakage or insulation failure, avoid power interruption or performance degradation of the vehicle due to abnormal high-voltage load, and reduce the risk of failure during vehicle driving.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, determining whether the high-voltage load of the vehicle is in an abnormal state includes: sending a switching request signal to the vehicle controller to switch the vehicle from the voltage control mode to the high-voltage control mode; determining whether a switching response signal sent by the vehicle controller is received, wherein the vehicle controller sends the switching response signal to the battery management system when receiving the switching request signal and detecting that the high-voltage load is not in an abnormal state; when receiving the switching response signal, determining that the high-voltage load is not in an abnormal state; when not receiving the switching response signal, determining that the high-voltage load is in an abnormal state.

[0010] In an embodiment of the present application, a switching request signal for switching the vehicle from a voltage control mode to a high-voltage control mode is sent to a vehicle controller through a battery management system. When the vehicle controller receives the switching request signal and detects that the high-voltage load is not in an abnormal state, the vehicle controller sends a switching response signal to the battery management system. The battery management system receives the switching response signal and determines that the high-voltage load is not in an abnormal state. The battery management system does not receive the switching response signal and determines that the high-voltage load is in an abnormal state. The technical solution realizes real-time management and coordinated operation of the high-voltage load through coordinated monitoring of the battery management system and the vehicle controller, effectively avoids failures caused by electrical parameter mismatch, and significantly improves the overall reliability and stability of the vehicle's high-voltage electrical system.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, switching the vehicle from the voltage control mode to the high-voltage control mode includes: detecting the remaining power of the battery pack; when the remaining power is greater than a preset power threshold, controlling the main relay between the battery pack and the high-voltage load to close, so as to switch the voltage control mode to the high-voltage control mode; wherein the battery pack provides high voltage power to the high-voltage load.

[0012] In an embodiment of the present application, when the vehicle switches from the voltage control mode to the high-voltage control mode, the remaining power of the battery pack is first detected. After confirming that the remaining power of the battery pack is sufficient to provide stable high-voltage power to the drive motor, the mode is switched. This not only ensures that the battery pack has sufficient power to provide high voltage power to drive the vehicle after the switch, but also avoids the vehicle switching from the high-voltage control mode to the voltage control mode due to low power in the battery pack, thereby reducing the frequency of switching between the voltage control mode and the high-voltage control mode.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, obtaining the working status of the battery pack includes: obtaining the battery temperature of the battery pack; determining whether the battery temperature is greater than a temperature threshold; if so, determining that the working status is used to characterize that the battery pack can provide high voltage electricity for the high voltage load of the vehicle; if not, determining that the working status is used to characterize that the battery pack cannot provide high voltage electricity for the high voltage load of the vehicle.

[0014] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, obtaining the working state of the battery pack includes: obtaining the cell voltage of each battery cell in the battery pack to obtain multiple cell voltages; when the difference between any two cell voltages among the multiple cell voltages is within a preset interval, determining the working state is used to characterize that the battery pack can provide high voltage electricity for the high voltage load of the vehicle; when the difference between any two cell voltages among the multiple cell voltages is not within the preset interval, determining the working state is used to characterize that the battery pack cannot provide high voltage electricity for the high voltage load of the vehicle.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, after obtaining the working status of the battery pack, the method also includes: starting timing when the working status indicates that the battery pack cannot provide high voltage electricity for the high-voltage load of the vehicle; and outputting abnormal prompt information of the battery pack when the timing duration is greater than a preset duration threshold.

[0016] In a second aspect, a vehicle control device is provided, which is applied to a battery management system of a vehicle, and the vehicle control device includes:

[0017] an acquisition module, configured to acquire the working state of the battery pack when the vehicle is in a voltage control mode; wherein, when the vehicle is in the voltage control mode, the engine is used to drive the vehicle, and the working state is used to characterize whether the battery pack can provide high voltage electricity for the high voltage load of the vehicle;

[0018] A judgment module, used to judge whether the vehicle meets the switching condition from the voltage control mode to the high-voltage control mode according to the working state; wherein, when the vehicle is in the high-voltage control mode, the driving motor is used to drive the vehicle;

[0019] A switching module is used to switch the vehicle from the voltage control mode to the high voltage control mode when the switching condition is met.

[0020] In a third aspect, a car is provided, comprising a memory for storing executable program code; and a processor for calling and running the executable program code from the memory, so that the car executes the method in the above-mentioned first aspect or any possible implementation of the first aspect.

[0021] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0022] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a vehicle control method provided in an embodiment of the present application is shown;

[0024] Figure 2 A schematic diagram showing the structure of a hybrid electric drive system provided by an embodiment of the present application is shown;

[0025] Figure 3 A comparison diagram showing a process of switching from a voltage control mode to a high-voltage control mode between an existing solution provided in an embodiment of the present application and the solution of the present application is shown;

[0026] Figure 4 A signaling flow chart provided in an embodiment of the present application is shown;

[0027] Figure 5 A schematic structural diagram of a vehicle control device provided in an embodiment of the present application is shown;

[0028] Figure 6 A schematic structural diagram of a vehicle provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0030] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0031] Hybrid vehicles can use the engine and drive motor as power sources. During the operation of a hybrid vehicle, if it is detected that the battery pack cannot provide high voltage electricity for the vehicle's high voltage load, in order to ensure safety and protect the battery pack and other key components, the vehicle will cut off the power output of the battery pack, so that the vehicle's drive motor will not be powered and the vehicle will enter voltage control mode.

[0032] At present, when the vehicle is in voltage control mode, the vehicle is mainly driven by the engine. When it has been detected that the vehicle meets the requirements for switching from voltage control mode to high-voltage control mode, it is necessary to detect that the vehicle first performs a power-off operation and then performs a power-on operation, that is, the vehicle will be switched from voltage control mode to high-voltage control mode only after the vehicle is powered on again. From this point of view, when it has been detected that the vehicle meets the requirements for switching from voltage control mode to high-voltage control mode, it means that the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, but because the vehicle has not experienced the operation of powering off and then powering on, the vehicle cannot switch to high-voltage control mode, and the vehicle remains in voltage control mode, that is, the engine is always used to drive the vehicle, thereby increasing the fuel consumption of the vehicle.

[0033] Based on this, the embodiment of the present application provides a vehicle control method, device, vehicle and computer-readable storage medium, which are applied to hybrid vehicles. In the process of vehicle operation, the present application detects through the battery management system that the battery pack cannot provide high voltage electricity for the high voltage load of the vehicle, cuts off the power output of the battery pack, and makes the vehicle enter the voltage control mode. The vehicle starts the engine, and the engine drives the power generation system to operate, and the power generation system is used to power the drive motor, so that the drive motor drives the vehicle. When the vehicle is in the voltage control mode, the battery management system detects the working state of the battery pack in real time, and when the battery pack can provide high voltage electricity for the high voltage load of the vehicle, the vehicle is switched from the voltage control mode to the high voltage control mode, and the drive motor is powered by the battery pack, so that the drive motor drives the vehicle, so that when the hybrid vehicle is running in the voltage control mode, if it is detected that the battery pack can provide high voltage electricity for the high voltage load of the vehicle, the vehicle is switched from the voltage control mode to the high voltage control mode, and the battery pack is powered by the drive motor, so that the drive motor drives the vehicle, so that when the battery pack can provide high voltage electricity for the drive motor, the battery pack is used first to power the drive motor, so that the drive motor drives the vehicle, which not only reduces the fuel consumption of the vehicle, but also improves the utilization rate of the battery pack.

[0034] like Figure 1 As shown, Figure 1 A flow chart of a vehicle control method provided by an embodiment of the present application is shown. The method is applied to a battery management system of a vehicle, the vehicle is a hybrid vehicle, the drive system of the hybrid vehicle includes an engine and a drive motor, the engine can drive the power generation system to operate, and the power generation system is used to supply power to the drive motor so that the drive motor drives the vehicle; the battery pack can also supply power to the drive motor so that the drive motor drives the vehicle; the battery pack provides high voltage electricity to the high voltage load of the vehicle, and the high voltage load includes the drive motor.

[0035] The vehicle control method comprises the following steps:

[0036] S101, when the vehicle is in a voltage control mode, obtaining a working state of a battery pack;

[0037] S102, judging whether the vehicle meets the switching condition for switching from the voltage control mode to the high voltage control mode according to the working state;

[0038] S103: When a switching condition is met, the vehicle is switched from the voltage control mode to the high voltage control mode.

[0039] In an exemplary embodiment, if Figure 2 As shown, Figure 2 A partial circuit diagram of a high-voltage electrical system of a hybrid vehicle provided in an embodiment of the present application is shown, in which a battery management system monitors the working status of a battery pack and controls the on and off of a main relay; wherein the main relay comprises a main positive relay and a main negative relay; the battery pack is connected to a high-voltage distribution box via the main positive relay and the main negative relay; the high-voltage distribution box is connected to a drive motor and other loads via an inverter.

[0040] When the vehicle is in voltage control mode, the vehicle starts the engine, and the engine drives the power generation system to operate, and the power generation system is used to supply power to the drive motor, so that the drive motor drives the vehicle. Among them, the voltage control mode is a mode in which when the battery pack fails or cannot be used, the vehicle automatically starts the engine, and converts mechanical energy into electrical energy through the power generation system, and ensures that the electrical energy is output in a stable manner through the voltage regulation function of the electric drive system, thereby maintaining the normal operation of the vehicle. When the vehicle is in high-voltage control mode, the battery pack supplies power to the drive motor, so that the drive motor drives the vehicle. Among them, the high-voltage control mode is a mode in which the drive motor directly obtains electrical energy from the battery pack and converts it into mechanical energy to propel the vehicle forward. During the operation of the vehicle, the battery management system detects the working status of the battery pack in real time, and the working status is used to characterize whether the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, including the drive motor. When the battery management system detects that the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle, the engine is started first, and the engine drives the power generation system to operate, and the power generation system is used to supply power to the drive motor, so that the drive motor drives the vehicle, and then the battery management system controls the main relay between the battery pack and the high-voltage distribution box to disconnect. After the pre-charge relay is closed and the discharge is completed, the main positive relay is disconnected first, and then the main negative relay is disconnected, and the vehicle enters the voltage control mode. When the battery management system detects that the battery pack can provide high voltage electricity to the high-voltage load of the vehicle, the battery management system controls the main relay to close. When controlling the main relay to close, the main negative relay is closed first, and then the main positive relay is closed, so that the battery pack provides high voltage electricity to the high-voltage load of the vehicle, and then the engine is turned off, and the vehicle is driven by the drive motor, and the vehicle enters the high-voltage control mode. The reasons why the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle include: the battery pack itself causes the battery pack to be unable to provide high voltage electricity to the high-voltage load of the vehicle. For example, the battery pack itself causes the battery pack to be unable to provide high voltage electricity to the high-voltage load of the vehicle. It can be that the voltage of the battery pack is too high or too low, the temperature of the battery pack is too high or too low, and other faults, and it can also be the abnormal current of the battery pack itself, insulation failure, etc.

[0041] For example, when the vehicle is driving and the battery management system detects that the voltage of the battery pack is too high or too low, it determines that the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle, starts the engine, and drives the power generation system to operate. The power generation system supplies power to the drive motor so that the drive motor drives the vehicle, and disconnects the main relay between the battery pack and the high-voltage load, and the vehicle enters the voltage control mode.

[0042] Exemplarily, the vehicle is in a low-voltage power-on condition. When there is a high-voltage power-on demand (such as pressing the PEPS button, etc.), the battery management system detects the temperature of the battery pack. If it detects that the temperature of the battery pack does not meet the power-on temperature (such as in the Northeast region in winter mornings, the battery pack temperature is below -30°C, which is not within the battery pack operating temperature range), it is determined that the battery pack cannot provide high voltage electricity to the vehicle's high-voltage load, and the engine is started to drive the power generation system to operate. The power generation system is used to power the drive motor so that the drive motor drives the vehicle, and the main relay between the battery pack and the high-voltage load is disconnected, and the vehicle enters voltage control mode.

[0043] In one implementation, the working state of the battery pack can be determined by real-time collection of various data of the battery pack by the battery management system, wherein the data includes at least one of the voltage, current, temperature of the battery pack and the state of charge and health status of each battery cell. Determine whether there are any abnormalities in the collected data of the battery pack. If there are no abnormalities in the collected data of the battery pack, it is determined that the working state of the battery pack indicates that the battery pack can provide high voltage electricity for the high voltage load of the vehicle; if there is at least one abnormality in the collected data of the battery pack, it is determined that the working state of the battery pack indicates that the battery pack cannot provide high voltage electricity for the high voltage load of the vehicle.

[0044] If the working status of the battery pack indicates that the battery pack can provide high voltage electricity to the high voltage load of the vehicle, it is determined that the vehicle meets the switching conditions for switching from the voltage control mode to the high voltage control mode; if the working status indicates that the battery pack cannot provide high voltage electricity to the high voltage load of the vehicle, it is determined that the vehicle does not meet the switching conditions for switching from the voltage control mode to the high voltage control mode.

[0045] If it is determined that the vehicle meets the switching conditions for switching from voltage control mode to high-voltage control mode, it is considered that the battery pack can provide high voltage electricity for the vehicle's high-voltage loads, and the high-voltage loads include the drive motor, that is, the battery pack can provide high voltage electricity for the drive motor. The battery management system controls the main relay to close. When controlling the main relay to close, the main negative relay is closed first, and then the main positive relay is closed, so that the battery pack can provide high voltage electricity for the vehicle's high-voltage loads, and then the engine is turned off, and the drive motor is powered by the battery pack, so that the drive motor drives the vehicle, and the vehicle enters the high-voltage control mode.

[0046] like Figure 3 As shown, Figure 3 A comparison diagram of the process of switching from voltage control mode to high voltage control mode between an existing solution provided by an embodiment of the present application and the solution of the present application is shown. During vehicle operation, assuming that at time t1, the battery pack cannot provide high voltage electricity for the high voltage load of the vehicle, the vehicle is switched from high voltage control mode to voltage control mode; at time t2, the battery pack can provide high voltage electricity for the high voltage load of the vehicle. Figure 3As shown in (a), the existing scheme needs to continue to detect whether the vehicle has performed a power-off operation and a power-on operation after time t2. If it is detected at time t3 that the vehicle has performed a power-off operation, and it is detected at time t4 that the vehicle has performed a power-on operation, the vehicle is switched from the voltage control mode to the high-voltage control mode. Among them, the vehicle is in a driving state between time t1 and time t4, and the vehicle is always in the voltage control mode, that is, the engine drives the power generation system to operate, and the power generation system is used to power the drive motor so that the drive motor drives the vehicle. Before the vehicle is switched from the voltage control mode to the high-voltage control mode, the engine drives the power generation system to operate, and the power generation system is used to power the drive motor so that the first duration of the drive motor driving the vehicle is t4-t1.

[0047] like Figure 3 As shown in (b), after the vehicle adopts the vehicle control method of the present application, when it is detected at time t2 that the battery pack can provide high voltage electricity to the drive motor, the vehicle is immediately switched from the high voltage control mode to the voltage control mode. Then, after time t2, the battery pack is used to power the drive motor so that the drive motor drives the vehicle. Before the vehicle is switched from the voltage control mode to the high voltage control mode, the engine is used to drive the power generation system to operate, and the power generation system is used to power the drive motor so that the second time length that the drive motor drives the vehicle is t2-t1. By comparing (a) and (b), the second time length is less than the first time length, so it can be obtained that after the vehicle adopts the vehicle control method of the present application, the fuel consumption of the vehicle can be reduced and the utilization rate of the battery pack can be improved.

[0048] The embodiment of the present application adopts a technical solution of detecting the working status of the battery pack in real time when the vehicle is in the voltage control mode, and switching the vehicle from the voltage control mode to the high-voltage control mode when it is determined that the vehicle meets the switching conditions for switching from the voltage control mode to the high-voltage control mode according to the working status of the battery pack. This achieves that when the hybrid vehicle is running in the voltage control mode, if it is detected that the battery pack can provide high voltage electricity for the high-voltage load of the vehicle, the vehicle is switched from the voltage control mode to the high-voltage control mode, and the battery pack supplies power to the drive motor so that the drive motor drives the vehicle. This achieves that when the battery pack is able to provide high voltage electricity to the drive motor, the battery pack is preferentially used to supply power to the drive motor so that the drive motor drives the vehicle. This not only reduces the fuel consumption of the vehicle, but also improves the utilization rate of the battery pack.

[0049] In a possible implementation, switching the vehicle from the voltage control mode to the high voltage control mode includes the following steps:

[0050] Determine whether the high-voltage load of the vehicle is in an abnormal state; wherein the battery pack provides high-voltage electricity to the high-voltage load;

[0051] If the high-voltage load is not in an abnormal state, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode.

[0052] The high-voltage load of the vehicle includes an inverter, a drive motor, a charger, and a related cooling system. To determine whether the high-voltage load of the vehicle is not in an abnormal state, it can be to obtain the working state of the high-voltage load at the moment before the vehicle enters the voltage control mode, and determine whether the working state of the high-voltage load at the moment before the vehicle enters the voltage control mode is not in an abnormal state. If the high-voltage load is not in an abnormal state after the vehicle enters the voltage control mode and at the moment before, it means that the high-voltage load is stable and fault-free, and can operate safely and reliably within the designed working parameter range, meet the performance requirements of the system, and the high-voltage load works well with the battery management system, inverter and other related components, and can effectively provide high-voltage electricity for the high-voltage load of the vehicle. Control the main relay to close and switch the voltage control mode to the high-voltage control mode. If the high-voltage load is in an abnormal state after the vehicle enters the voltage control mode and at the moment before, it means that there is a fault in the high-voltage load system, abnormal parameters, etc., and the high-voltage load cannot work with the battery management system, inverter and other related components, and cannot provide high-voltage electricity for the high-voltage load of the vehicle.

[0053] The main relay between the control battery pack and the high-voltage load continues to be disconnected, and the vehicle continues to be in voltage control mode. Among them, the vehicle's high-voltage load is in normal working condition means that the vehicle's high-voltage load connection is normal, all components in the high-voltage system (such as high-voltage batteries, motors, electronic control systems, etc.) are operating normally, and key parameters such as voltage, current, and temperature are within a safe range. The system has no faults and can stably and efficiently provide the required power.

[0054] For example, Figure 3 As shown in (b), the vehicle enters the voltage control mode at time t1. When judging whether the high-voltage load of the vehicle is in an abnormal state, the working state of the high-voltage load at the previous moment t0 adjacent to time t1 can be obtained. If the high-voltage load at time t0 is not in an abnormal state, the main relay between the battery pack and the high-voltage load can be controlled to close at time t2 to switch the voltage control mode to the high-voltage control mode. If the high-voltage load at time t0 is in an abnormal state, the main relay between the battery pack and the high-voltage load is controlled to continue to be disconnected, and the vehicle continues to be in the voltage control mode.

[0055] In this embodiment, when the vehicle switches from the voltage control mode to the high-voltage control mode, it first determines whether the high-voltage load of the vehicle is in an abnormal state. When the high-voltage load is not in an abnormal state, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode. This can ensure that the high-voltage load operates stably without short circuit, leakage or insulation failure, etc., and can avoid power interruption or performance degradation of the vehicle due to abnormal high-voltage load, thereby reducing the risk of vehicle failure during driving.

[0056] In a possible implementation, determining whether the high-voltage load of the vehicle is in an abnormal state includes the following steps:

[0057] Sending a switching request signal to the vehicle controller for switching the vehicle from a voltage control mode to a high voltage control mode;

[0058] Determining whether a switching response signal sent by the vehicle controller is received, wherein the vehicle controller sends a switching response signal to the battery management system when receiving the switching request signal and detecting that the high-voltage load is not in an abnormal state;

[0059] In case of receiving the switching response signal, determining that the high voltage load is not in an abnormal state;

[0060] In the case where the switching response signal is not received, it is determined that the high voltage load is in an abnormal state.

[0061] In this embodiment, if Figure 4 As shown, Figure 4 A signaling flow chart provided by an embodiment of the present application is shown. When the switching conditions are met, the battery management system determines that the battery pack can provide high voltage electricity for the high voltage load of the vehicle, and then sends a switching request signal to the vehicle controller to switch the vehicle from the voltage control mode to the high voltage control mode, wherein the switching request signal is used to notify the vehicle controller to detect and evaluate the working state of the vehicle's high voltage load. After receiving the switching request signal, the vehicle controller begins to detect whether the high voltage load of the vehicle is in an abnormal state. When the high voltage load of the vehicle is not in an abnormal state, the vehicle controller sends a switching response signal to the battery management system, wherein the switching response signal is used to notify the battery management system that the high voltage load of the vehicle is not in an abnormal state, and the main relay between the battery pack and the high voltage load can be controlled to close, and the vehicle is switched from the voltage control mode to the high voltage control mode. The battery management system determines whether the switching response signal is received. If the battery management system receives the switching response signal, it determines that the high voltage load is not in an abnormal state; if the battery management system does not receive the switching response signal, it determines that the high voltage load is in an abnormal state.

[0062] In this embodiment, a switching request signal for switching the vehicle from a voltage control mode to a high-voltage control mode is sent to the vehicle controller through the battery management system. When the vehicle controller receives the switching request signal and detects that the high-voltage load is not in an abnormal state, the vehicle controller sends a switching response signal to the battery management system. The battery management system receives the switching response signal and determines that the high-voltage load is not in an abnormal state. The battery management system does not receive the switching response signal and determines that the high-voltage load is in an abnormal state. The technical solution realizes real-time management and coordinated operation of the high-voltage load through coordinated monitoring between the battery management system and the vehicle controller, effectively avoiding failures caused by electrical parameter mismatch and improving the overall reliability and stability of the vehicle's high-voltage electrical system.

[0063] In a possible implementation, switching the vehicle from the voltage control mode to the high voltage control mode includes the following steps:

[0064] Detect the remaining power of the battery pack;

[0065] When the remaining power is greater than a preset power threshold, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode; wherein the battery pack provides high voltage power to the high-voltage load.

[0066] In order to ensure that the battery pack has sufficient power to provide high voltage electricity to the high voltage load of the vehicle, before switching the vehicle from the voltage control mode to the high voltage control mode, the remaining power of the battery pack is detected and the remaining power value is compared with the preset power threshold. If the remaining power is greater than the preset power threshold, the vehicle is switched from the voltage control mode to the high voltage control mode. If the remaining power is less than or equal to the preset power threshold, the vehicle continues to be in the voltage control mode.

[0067] When the vehicle switches from voltage control mode to high-voltage control mode, the remaining power of the battery pack is first detected. After confirming that the remaining power of the battery pack is sufficient to provide stable high-voltage power to the drive motor, the mode is switched. This not only ensures that the battery pack has sufficient power to provide high voltage power to drive the vehicle after the switch, but also avoids the vehicle switching from high-voltage control mode to voltage control mode due to low battery pack power, thereby reducing the frequency of switching between voltage control mode and high-voltage control mode.

[0068] There are many ways to obtain the working status of the battery pack. Two ways of obtaining the working status of the battery pack are described below.

[0069] In a possible implementation, obtaining the working status of the battery pack includes the following steps:

[0070] Get the battery temperature of the battery pack;

[0071] Determine whether the battery temperature is greater than a temperature threshold;

[0072] If so, determining the working state is used to characterize that the battery pack is capable of providing high voltage electricity to the high voltage load of the vehicle;

[0073] If not, determining the working state is used to characterize that the battery pack is unable to provide high voltage power to the high voltage load of the vehicle.

[0074] For the first way to obtain the working status of the battery pack, the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle due to environmental factors, so that the vehicle enters the voltage control mode. For example, if the ambient temperature is low and the temperature of the battery pack does not reach the power-on temperature, the battery pack cannot provide high voltage electricity to the drive motor. When obtaining the working status of the battery pack, the battery temperature of the battery pack can be collected by the battery management system to determine whether the battery temperature of the battery pack is greater than the temperature threshold of the battery pack. When the temperature of the battery pack is greater than the temperature threshold, it can be determined that the battery pack can provide high voltage electricity to the high-voltage load of the vehicle, that is, the working status of the battery pack is obtained to characterize that the battery pack can provide high voltage electricity to the high-voltage load of the vehicle. When the obtained temperature of the battery pack is less than or equal to the temperature threshold of the battery pack, the working status of the battery pack is obtained to characterize that the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle.

[0075] In a possible implementation, obtaining the working status of the battery pack includes the following steps:

[0076] Obtaining the cell voltage of each battery cell in the battery pack to obtain multiple cell voltages;

[0077] When the difference between any two cell voltages among the plurality of cell voltages is within a preset range, determining the working state is used to indicate that the battery pack is capable of providing high voltage electricity to the high voltage load of the vehicle;

[0078] When the difference between any two cell voltages among the multiple cell voltages is not within a preset interval, determining the working state is used to indicate that the battery pack is unable to provide high voltage electricity to the high voltage load of the vehicle.

[0079] For the second way to obtain the working status of the battery pack, the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle due to the battery pack's own reasons, so that the vehicle enters the voltage control mode. When obtaining the working status of the battery pack, the cell voltage of each battery cell in the battery pack can be collected through the battery management system. Based on the cell voltage of each battery cell, the difference between any two cell voltages is determined. When the difference between any two cell voltages is within the preset interval, it is determined that the battery pack can provide high voltage electricity to the high-voltage load of the vehicle. When the difference between any two cell voltages is not within the preset interval, it is determined that the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle. Among them, the preset interval is the maximum range allowed for the voltage difference between any two battery cells in the battery pack, which is usually controlled between 10mV-50mV, and can be dynamically adjusted according to the battery type, application scenario and battery status.

[0080] When obtaining the working status of the battery pack, the use of the above two methods not only gives the battery management system higher flexibility, but also greatly enriches its selectivity, enabling the battery management system to select monitoring methods according to different monitoring needs and adapt to various complex application scenarios, thereby ensuring the stability and reliability of the system.

[0081] It should be noted that when obtaining the working status of the battery pack, in addition to the battery temperature of the battery pack and the balanced status data of the battery pack, the working status of the battery pack can also be determined based on other parameters of the battery pack, such as the current data of the battery pack and the health status data of the battery pack. Determine whether there is abnormal data in the current data of the battery pack and the health status data of the battery pack. If there is no abnormal data in the current data of the battery pack and the health status data of the battery pack, it is determined that the battery pack can provide high voltage electricity to the high-voltage load of the vehicle. If there is abnormal data in the current data of the battery pack and the health status data of the battery pack, it is determined that the battery pack cannot provide high voltage electricity to the high-voltage load of the vehicle.

[0082] In a possible implementation, after obtaining the working status of the battery pack, the method further includes:

[0083] When the working state indicates that the battery pack cannot provide high voltage electricity to the high voltage load of the vehicle, starting timing;

[0084] When the timing duration is greater than a preset duration threshold, abnormal prompt information of the battery pack is output.

[0085] Battery pack failures include those that cannot be automatically recovered and those that can be automatically recovered. Failures that cannot be automatically recovered from the battery pack involve actual physical damage to the internal components of the battery pack or long-term accumulated losses, and cannot be resolved by a simple restart or other temporary measures. They are usually caused by battery pack hardware damage, permanent battery pack failure, or failures that require specific intervention to resolve. Exemplarily, a failure that cannot be automatically recovered may be at least one of a short circuit inside the battery pack, damage to a battery cell, capacity attenuation, external physical damage, and battery performance failure. A battery pack failure that can be automatically recovered is a temporary environmental factor or a failure triggered by the system's self-protection mechanism, which allows the system to automatically restore the battery pack to a state of providing high voltage electricity to the vehicle's high-voltage load after the problem is eliminated. Exemplarily, a failure that can be automatically recovered may be at least one of over-temperature protection, voltage fluctuation, high-voltage leakage protection, and instantaneous current overload.

[0086] If the battery pack is unable to provide high voltage electricity to the high voltage load of the vehicle for a period of time exceeding a certain period, indicating that the battery pack has a fault that cannot be automatically recovered, abnormal prompt information of the battery pack can be generated and output. The abnormal prompt information can remind the user that the battery pack has a fault that cannot be automatically recovered and requires timely maintenance. The user should repair the battery pack as soon as possible, thereby eliminating the battery pack fault as soon as possible and maintaining the performance and safety of the vehicle.

[0087] The following are device embodiments of the present application, which can be used to execute method embodiments of the present application.

[0088] like Figure 5 As shown, Figure 5 A schematic structural diagram of a vehicle control device provided in an embodiment of the present application is shown.

[0089] For example, Figure 5 As shown, the device 500 is applied to a battery management system of a vehicle, and the device 500 includes:

[0090] The acquisition module 501 is used to acquire the working state of the battery pack when the vehicle is in the voltage control mode; wherein, when the vehicle is in the voltage control mode, the vehicle starts the engine, the engine drives the power generation system to operate, and the power generation system supplies power to the drive motor so that the drive motor drives the vehicle, and the working state is used to characterize whether the battery pack can provide high voltage electricity to the high voltage load of the vehicle, and the high voltage load includes the drive motor;

[0091] The judgment module 502 is used to judge whether the vehicle meets the switching condition from the voltage control mode to the high-voltage control mode according to the working state; wherein, when the vehicle is in the high-voltage control mode, the drive motor is powered by the battery pack so that the drive motor drives the vehicle;

[0092] The switching module 503 is used to switch the vehicle from the voltage control mode to the high voltage control mode when a switching condition is met.

[0093] In a possible implementation, the switching module 503 is further configured to:

[0094] Determine whether the high-voltage load of the vehicle is in an abnormal state; wherein the battery pack provides high-voltage electricity to the high-voltage load;

[0095] If the high-voltage load is not in an abnormal state, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode.

[0096] In a possible implementation, the switching module 503 is further configured to:

[0097] Sending a switching request signal to the vehicle controller for switching the vehicle from a voltage control mode to a high voltage control mode;

[0098] Determining whether a switching response signal sent by the vehicle controller is received, wherein the vehicle controller sends a switching response signal to the battery management system when receiving the switching request signal and detecting that the high-voltage load is not in an abnormal state;

[0099] In case of receiving the switching response signal, determining that the high voltage load is not in an abnormal state;

[0100] In the case where the switching response signal is not received, it is determined that the high voltage load is in an abnormal state.

[0101] In a possible implementation, the switching module 503 is further configured to:

[0102] Detect the remaining power of the battery pack;

[0103] When the remaining power is greater than a preset power threshold, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode; wherein the battery pack provides high voltage power to the high-voltage load.

[0104] In a possible implementation, the acquisition module 501 is further used to:

[0105] Get the battery temperature of the battery pack;

[0106] Determine whether the battery temperature is greater than a temperature threshold;

[0107] If so, determining the working state is used to characterize that the battery pack is capable of providing high voltage electricity to the high voltage load of the vehicle;

[0108] If not, determining the working state is used to characterize that the battery pack is unable to provide high voltage power to the high voltage load of the vehicle.

[0109] In a possible implementation, the acquisition module 501 is further used to:

[0110] Obtaining the cell voltage of each battery cell in the battery pack to obtain multiple cell voltages;

[0111] When the difference between any two cell voltages among the plurality of cell voltages is within a preset range, determining the working state is used to indicate that the battery pack is capable of providing high voltage electricity to the high voltage load of the vehicle;

[0112] When the difference between any two cell voltages among the multiple cell voltages is not within a preset interval, determining the working state is used to indicate that the battery pack is unable to provide high voltage electricity to the high voltage load of the vehicle.

[0113] In a possible implementation, the device 500 includes:

[0114] An output module, used to start timing when the working state indicates that the battery pack cannot provide high voltage electricity to the high voltage load of the vehicle;

[0115] When the timing duration is greater than the preset duration threshold, an abnormal prompt message of the battery pack is output.

[0116] It should be noted that the vehicle control device provided in the above embodiment, when executing the vehicle control method, only uses the division of the above-mentioned functional modules as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0117] In addition, the vehicle control device and vehicle control method embodiments provided in the above embodiments belong to the same concept. Therefore, for details not disclosed in the device embodiments of this specification, please refer to the above-mentioned vehicle control method embodiments of this specification, which will not be repeated here.

[0118] like Figure 6 As shown, Figure 6 A schematic structural diagram of a vehicle provided in an embodiment of the present application is shown.

[0119] For example, Figure 6 As shown, the vehicle 600 includes: a memory 601 and a processor 602, wherein the memory 601 stores an executable program code 6011, and the processor 602 is used to call and execute the executable program code 6011 to perform a vehicle control method.

[0120] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores an executable program code, and the processor is used to call and execute the executable program code to execute a vehicle control method provided by an embodiment of the present application.

[0121] In this embodiment, the functional modules of the device can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0122] It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

[0123] It should be understood that the device provided in this embodiment is used to execute the above-mentioned vehicle control method, and thus can achieve the same effect as the above-mentioned implementation method.

[0124] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module may be used to control and manage the actions of the vehicle. The storage module may be used to support the vehicle in executing related program codes, etc.

[0125] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits shown in conjunction with the disclosure of the present application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0126] In addition, the device provided in the embodiments of the present application may specifically be a chip, component or module, and the chip may include a connected processor and memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a vehicle control method provided in the above embodiments.

[0127] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is run on a computer, the computer executes the above-mentioned related method steps to implement a vehicle control method provided by the above-mentioned embodiment.

[0128] This embodiment also provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a vehicle control method provided by the above-mentioned embodiment.

[0129] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0130] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0131] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0132] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle control method, characterized in that: A battery management system for a vehicle, the method comprising: When the vehicle is in a voltage control mode, the working state of the battery pack is obtained; wherein, when the vehicle is in the voltage control mode, the vehicle starts an engine, the engine drives the power generation system to operate, and the power generation system is used to supply power to the drive motor so that the drive motor drives the vehicle, and the working state is used to indicate whether the battery pack can provide high voltage electricity to the high voltage load of the vehicle, and the high voltage load includes the drive motor; According to the working state, determining whether the vehicle meets the switching condition of switching from the voltage control mode to the high-voltage control mode; wherein, when the vehicle is in the high-voltage control mode, the battery pack is used to supply power to the drive motor so that the drive motor drives the vehicle; When the switching condition is satisfied, the vehicle is switched from the voltage control mode to the high voltage control mode.

2. The method according to claim 1, characterized in that The switching of the vehicle from the voltage control mode to the high voltage control mode comprises: Determining whether the high-voltage load of the vehicle is in an abnormal state; wherein the battery pack provides high-voltage electricity to the high-voltage load; If the high-voltage load is not in an abnormal state, a main relay between the battery pack and the high-voltage load is controlled to be closed, so as to switch the voltage control mode to the high-voltage control mode.

3. The method according to claim 2, characterized in that The determining whether the high-voltage load of the vehicle is in an abnormal state includes: Sending a switching request signal to a vehicle controller for switching the vehicle from the voltage control mode to the high voltage control mode; Determining whether a switching response signal sent by the vehicle controller is received, wherein the vehicle controller sends the switching response signal to the battery management system when receiving the switching request signal and detecting that the high-voltage load is not in an abnormal state; In case of receiving the switching response signal, determining that the high voltage load is not in an abnormal state; In a case where the switching response signal is not received, it is determined that the high voltage load is in an abnormal state.

4. The method according to claim 1, characterized in that The switching of the vehicle from the voltage control mode to the high voltage control mode comprises: Detecting the remaining power of the battery pack; When the remaining power is greater than a preset power threshold, the main relay between the battery pack and the high-voltage load is controlled to close to switch the voltage control mode to the high-voltage control mode; wherein the battery pack provides high voltage power to the high-voltage load.

5. The method according to claim 1, characterized in that The obtaining the working status of the battery pack includes: Acquiring a battery temperature of the battery pack; Determining whether the battery temperature is greater than a temperature threshold; If so, determining that the working state is used to characterize that the battery pack is capable of providing high voltage electricity to the high voltage load of the vehicle; If not, determining the operating state is used to indicate that the battery pack is unable to provide high voltage electricity to the high voltage load of the vehicle.

6. The method according to claim 1, characterized in that The obtaining the working status of the battery pack includes: Acquire the cell voltage of each battery cell in the battery pack to obtain multiple cell voltages; When the difference between any two cell voltages among the plurality of cell voltages is within a preset range, determining the working state is used to indicate that the battery pack can provide high voltage electricity for the high voltage load of the vehicle; When the difference between any two cell voltages among the plurality of cell voltages is not within a preset interval, determining the working state is used to indicate that the battery pack is unable to provide high voltage electricity to the high voltage load of the vehicle.

7. The method according to claim 1, characterized in that After obtaining the working status of the battery pack, the method further includes: When the working state indicates that the battery pack cannot provide high voltage electricity to the high voltage load of the vehicle, starting timing; When the timing duration is greater than a preset duration threshold, abnormal prompt information of the battery pack is output.

8. A vehicle control device, characterized in that: A battery management system for a vehicle, the device comprising: an acquisition module, configured to acquire the working state of the battery pack when the vehicle is in a voltage control mode; wherein, when the vehicle is in the voltage control mode, the vehicle starts an engine, the engine drives the power generation system to operate, and the power generation system supplies power to the drive motor so that the drive motor drives the vehicle, and the working state is used to indicate whether the battery pack can provide high voltage electricity to the high voltage load of the vehicle, and the high voltage load includes the drive motor; a judgment module, configured to judge whether the vehicle satisfies a switching condition for switching from the voltage control mode to the high-voltage control mode according to the working state; wherein, when the vehicle is in the high-voltage control mode, the drive motor is powered by the battery pack so that the drive motor drives the vehicle; A switching module is used to switch the vehicle from the voltage control mode to the high voltage control mode when the switching condition is met.

9. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

Images