A pure electric vehicle power management control method and system and a pure electric vehicle

Abstract

The application discloses a kind of pure electric vehicle electric quantity management control method, system and pure electric vehicle, belong to pure electric vehicle technical field, the method includes: battery management system (BMS) calculates the maximum power P1 of allowing battery to output to motor controller (MCU) and is fed back to vehicle controller (VCU);Battery management system (BMS) judges whether battery remaining capacity state (SOC) is less than preset battery remaining capacity state (SOC) threshold value, if yes, then the information that battery remaining capacity state (SOC) is less than preset battery remaining capacity state (SOC) threshold value is fed back to vehicle controller (VCU), and vehicle controller (VCU) limits the highest speed;Vehicle controller (VCU) judges the relationship between the highest speed and actual speed, and controls the power of battery output to motor controller (MCU) according to the result of judging.By the application, the endurance of pure electric vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pure electric vehicles, and in particular, the present application relates to a pure electric vehicle power management control method, system and pure electric vehicle. BACKGROUND

[0002] The endurance mileage and battery life of a pure electric vehicle are crucial. In the energy management control system of a pure electric vehicle, power is generally distributed between high-voltage accessories and power, and less consideration is given to the endurance mileage of the vehicle and the life of the battery.

[0003] In patent CN108215895B, a pure electric vehicle energy recovery management method and management system are disclosed. The management method detects the temperature of the battery, compares the battery temperature, the battery power value and the residual electric energy conversion power value as input signals with the preset upper limit of the battery temperature, the lower limit of the battery temperature and the battery power threshold, and then controls the flow direction of the electric energy converted after braking energy recovery. The energy recovery management system is composed of a motor module, a power module, a detection module, a control module, an execution circuit module, an energy consumption module and a heating and cooling module.

[0004] However, the above-mentioned patent disclosed technology cannot improve the endurance capability of the pure electric vehicle. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a pure electric vehicle power management control method, system and pure electric vehicle to improve the endurance capability of the pure electric vehicle.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] The present application provides a pure electric vehicle power management control method, which comprises the following steps:

[0008] Step 1: The battery management system (BMS) determines the available discharge power of the battery;

[0009] Step 2: The vehicle controller (VCU) determines the power required by the high-voltage accessories during operation and feeds back to the battery management system (BMS);

[0010] Step 3: The battery management system (BMS) calculates the maximum power P1 allowed to be output to the motor controller (MCU) and feeds back to the vehicle controller (VCU);

[0011] Step 4: The battery management system (BMS) determines whether the state of charge (SOC) of the battery is less than a preset state of charge (SOC) threshold value, and if so, feeds back information that the state of charge (SOC) of the battery is less than the preset state of charge (SOC) threshold value to the vehicle controller (VCU), and the vehicle controller (VCU) limits the maximum vehicle speed;

[0012] Step 5: The vehicle controller (VCU) determines the relationship between the limited maximum vehicle speed and the actual vehicle speed, and controls the power output from the battery to the motor controller (MCU) according to the determination result.

[0013] Further, in step 5, if the vehicle controller (VCU) determines that the limited maximum vehicle speed is greater than the actual vehicle speed, and the value X of the greater part is not less than the first value threshold, then the vehicle controller (VCU) controls the battery to output power P1 to the motor controller (MCU), and the motor controller (MCU) drives the motor.

[0014] Further, in step 5, if the vehicle controller (VCU) determines that the limited maximum vehicle speed is greater than the actual vehicle speed, and the value X of the greater part is less than the first value threshold, then the vehicle controller (VCU) controls the battery to output power P to the motor controller (MCU), and the motor controller (MCU) drives the motor.

[0015] Further, P = 0.1P1X, 0≤X<10.

[0016] Further, the preset state of charge (SOC) threshold value is 30%.

[0017] Further, the limited maximum vehicle speed is 60Km / h.

[0018] The application also provides a pure electric vehicle power management control system, which comprises a battery management system (BMS), a vehicle controller (VCU), a motor controller (MCU), a motor and a battery, the battery management system (BMS) is connected with the vehicle controller (VCU) and the battery respectively; the vehicle controller (VCU) is connected with the motor controller (MCU); and the motor controller (MCU) is connected with the motor and the battery respectively.

[0019] Further, the battery management system (BMS) determines the available discharge power of the battery, the vehicle controller (VCU) determines the power required for the high-voltage accessory to work and feeds back to the battery management system (BMS), and the battery management system (BMS) calculates the maximum power P1 allowed to be output from the battery to the motor controller (MCU) and feeds back to the vehicle controller (VCU).

[0020] Further, the battery management system (BMS) judges whether the battery remaining power state (SOC) is less than a preset battery remaining power state (SOC) threshold value, if yes, feeds back information that the battery remaining power state (SOC) is less than the preset battery remaining power state (SOC) threshold value to the vehicle controller (VCU), the vehicle controller (VCU) limits the highest vehicle speed, judges the relationship between the limited highest vehicle speed and the actual vehicle speed, and controls the power output from the battery to the motor controller (MCU) according to the judgment result.

[0021] The application also provides a pure electric vehicle, which adopts the pure electric vehicle power management control method to manage the power of the pure electric vehicle.

[0022] The power management control method and the control system have the following advantages:

[0023] (1) The power management control method and the control system can improve the endurance of the pure electric vehicle.

[0024] (2) In the application, when the battery remaining power state (SOC) is less than the preset battery remaining power state (SOC) threshold value, the vehicle controller (VCU) controls the limited highest vehicle speed, thereby reducing the vehicle running resistance, achieving energy saving effect, and increasing the endurance of the pure electric vehicle.

[0025] (3) In the application, while limiting the highest vehicle speed, the low-speed acceleration performance of the vehicle, the obstacle crossing ability and the climbing ability can be ensured.

[0026] (4) In the application, by reserving high-voltage accessory power and redistributing the remaining power to the motor, current overcurrent can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present specification includes the following drawings, and the contents shown are as follows:

[0028] Figure 1 is a flow chart of a pure electric vehicle power management control method of the application;

[0029] Figure 2 is a logic structure block diagram of a pure electric vehicle power management control system of the application.

[0030] Explanation of reference numerals: 1, battery management system (BMS); 2, vehicle controller (VCU); 3, motor controller (MCU); 4, motor; 5, battery. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be further described below with reference to the drawings, and the purpose is to help the technical personnel in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present application, and to help its implementation.

[0032] Figure 1 is a flow chart of a pure electric vehicle power management control method of the present application, which comprises the following steps:

[0033] Step 1: The battery management system (BMS) 1 determines the available discharge power of the battery 5, i.e. corresponds to S1 in Figure 1 Specifically, the remaining power state (SOC) of the battery 5 is monitored in real time by the battery management system (BMS) 1, and the available discharge power of the battery 5 is determined.

[0034] Step 2: The vehicle controller (VCU) 2 determines the power required by the high-voltage accessories when working and feeds back to the battery management system (BMS) 1, i.e. corresponds to S2 in Figure 1

[0035] Step 3: The battery management system (BMS) 1 calculates the maximum power P1 allowed to be output by the battery 5 to the motor controller (MCU) 3 and feeds back to the vehicle controller (VCU) 2, i.e. corresponds to S3 in Figure 1 Specifically, after receiving the information of the power required by the high-voltage accessories when working fed back by the vehicle controller (VCU) 2, the battery management system (BMS) 1 subtracts the power required by the high-voltage accessories when working from the available discharge power of the battery 5 determined by it to obtain the maximum power P1 allowed to be output by the battery 5 to the motor controller (MCU) 3, and feeds back this information to the vehicle controller (VCU) 2. By reserving the high-voltage accessory power and distributing the remaining power to the motor 4, current overcurrent can be prevented.

[0036] Step 4: The battery management system (BMS) 1 judges whether the battery remaining power state (SOC) is less than the preset battery remaining power state (SOC) threshold, if yes, feeds back the information that the battery remaining power state (SOC) is less than the preset battery remaining power state (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum vehicle speed, i.e. corresponds to Figure 1 ​S4-S6. Specifically, after obtaining the maximum power P1 allowed to be output from the battery 5 to the motor controller (MCU) 3, the battery management system (BMS) 1 judges whether the state of charge (SOC) of the battery is less than a preset state of charge (SOC) threshold value. If not, the battery management system (BMS) 1 does not feed back information that the state of charge (SOC) of the battery is not less than the preset state of charge (SOC) threshold value to the vehicle control unit (VCU) 2, and the vehicle control unit (VCU) 2 does not limit the maximum speed. If yes, the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery is less than the preset state of charge (SOC) threshold value to the vehicle control unit (VCU) 2, and the vehicle control unit (VCU) 2 limits the maximum speed, thereby reducing the driving resistance of the vehicle and achieving energy-saving effect, so as to increase the cruising range of the pure electric vehicle. In addition, while limiting the maximum speed, the low-speed acceleration performance, obstacle crossing ability and climbing ability of the vehicle can be ensured.

[0037] Step 5: The vehicle control unit (VCU) 2 judges the relationship between the limited maximum speed and the actual speed, and controls the power output from the battery 4 to the motor controller (MCU) 3 according to the judgment result. That is, corresponding to Figure 1 S7-S9. Specifically, when the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery is less than the preset state of charge (SOC) threshold value to the vehicle control unit (VCU) 2, and the vehicle control unit (VCU) 2 limits the maximum speed, the vehicle control unit (VCU) 2 will obtain the real-time speed of the vehicle and judge the relationship between the limited maximum speed and the actual speed. If the vehicle control unit (VCU) 2 judges that the limited maximum speed is greater than the actual speed, and the value X greater than the actual speed is not less than the first value threshold, the vehicle control unit (VCU) 2 controls the battery 5 to output power P1 to the motor controller (MCU) 3, and the motor controller (MCU) 3 drives the motor 4. If the vehicle control unit (VCU) 2 judges that the limited maximum speed is greater than the actual speed, and the value X greater than the actual speed is less than the first value threshold, the vehicle control unit (VCU) 2 controls the battery 5 to output power P to the motor controller (MCU) 3, and the motor controller (MCU) 3 drives the motor 4, wherein P = 0.1P1X, 0≤X<10. That is, the cruising ability of the pure electric vehicle can be improved.

[0038] Figure 2Is a pure electric vehicle power management control system logic structure block diagram of the application, including battery management system (BMS) 1, vehicle controller (VCU) 2, motor controller (MCU) 3, motor 4 and battery 5, battery management system (BMS) 1 is connected with vehicle controller (VCU) 2 and battery 5 respectively; Vehicle controller (VCU) 3 is connected with motor controller (MCU) 3; Motor controller (MCU) 3 is connected with motor 4 and battery 5 respectively.

[0039] Among them, the available discharge power of battery 5 is determined by battery management system (BMS) 1, the power required by high-voltage accessories when working is determined by vehicle controller (VCU) 2 and fed back to battery management system (BMS) 1, and the maximum power P1 allowed to be output by battery 5 to motor controller (MCU) 3 is calculated by battery management system (BMS) 1 and fed back to vehicle controller (VCU) 2. Specifically, battery management system (BMS) 1 monitors the remaining power state (SOC) of battery 5 in real time and determines the available discharge power of battery 5, vehicle controller (VCU) 2 determines the power required by high-voltage accessories when working and feeds back to battery management system (BMS) 1, after receiving the information of the power required by high-voltage accessories when working fed back by vehicle controller (VCU) 2, battery management system (BMS) 1 subtracts the power required by high-voltage accessories when working from the available discharge power of battery 5 determined by it, obtains the maximum power P1 allowed to be output by battery 5 to motor controller (MCU) 3, and feeds back the information to vehicle controller (VCU) 2. By reserving high-voltage accessory power and redistributing the remaining power to motor 4, current overcurrent can be prevented.

[0040] In addition, the battery management system (BMS) 1 judges whether the state of charge (SOC) of the battery 5 is less than a preset state of charge (SOC) threshold value. If yes, the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery 5 is less than the preset state of charge (SOC) threshold value to the vehicle controller (VCU) 2. The vehicle controller (VCU) 2 limits the maximum speed, judges the relationship between the limited maximum speed and the actual speed, and controls the power output from the battery 5 to the motor controller (MCU) 3 according to the judgment result. Specifically, after obtaining the maximum power P1 allowed to be output from the battery 5 to the motor controller (MCU) 3, the battery management system (BMS) 1 judges whether the state of charge (SOC) of the battery 5 is less than the preset state of charge (SOC) threshold value. If no, the battery management system (BMS) 1 does not feed back information that the state of charge (SOC) of the battery 5 is not less than the preset state of charge (SOC) threshold value to the vehicle controller (VCU) 2. The vehicle controller (VCU) 2 does not limit the maximum speed. If yes, the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery 5 is less than the preset state of charge (SOC) threshold value to the vehicle controller (VCU) 2. The vehicle controller (VCU) 2 limits the maximum speed, thereby reducing the vehicle running resistance, achieving energy saving effect, increasing the cruising range of the pure electric vehicle, and improving the cruising ability of the pure electric vehicle. In addition, while limiting the maximum speed, the low-speed acceleration performance, obstacle crossing ability and climbing ability of the vehicle can be ensured. When the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery 5 is less than the preset state of charge (SOC) threshold value to the vehicle controller (VCU) 2, the vehicle controller (VCU) 2 limits the maximum speed. The vehicle controller (VCU) 2 obtains the real-time speed of the vehicle, judges the relationship between the limited maximum speed and the actual speed, and controls the power output from the battery 5 to the motor controller (MCU) 3 according to the judgment result. If the vehicle controller (VCU) 2 judges that the limited maximum speed is greater than the actual speed by a value X which is not less than a first value threshold, the vehicle controller (VCU) 2 controls the battery 5 to output power P1 to the motor controller (MCU) 3. The motor controller (MCU) 3 drives the motor 4. If the vehicle controller (VCU) 2 judges that the limited maximum speed is greater than the actual speed by a value X which is less than the first value threshold, the vehicle controller (VCU) 2 controls the battery 5 to output power P to the motor controller (MCU) 3. The motor controller (MCU) 3 drives the motor 4, wherein P = 0.1P1X, 0≤X<10. The cruising ability of the pure electric vehicle is improved.

[0041] In the specific embodiment, the preset state of charge (SOC) threshold value is 30%, the limited maximum speed is 60Km / h, and the first value threshold is 10.

[0042] In the specific embodiment, the high-voltage accessories include inverters, compressors, PTCs, etc.

[0043] In addition, the application also provides a pure electric vehicle, which uses the pure electric vehicle power management control method to manage the power of the pure electric vehicle.

[0044] Effects of the embodiments

[0045] After receiving the information of the power required by the high-voltage accessories during work from the vehicle controller (VCU) 2, the battery management system (BMS) 1 obtains the maximum power P1 allowed to be output by the battery 5 to the motor controller (MCU) 3 by subtracting the power required by the high-voltage accessories during work from the available discharge power of the battery 5 determined by the battery management system (BMS) 1, and feeds back the information to the vehicle controller (VCU) 2. By reserving the power of the high-voltage accessories and then distributing the remaining power to the motor 4, overcurrent can be prevented.

[0046] After obtaining the maximum power P1 allowed to be output by the battery 5 to the motor controller (MCU) 3, the battery management system (BMS) 1 judges whether the state of charge (SOC) of the battery is less than a preset state of charge (SOC) threshold. If not, the battery management system (BMS) 1 does not feed back the information that the state of charge (SOC) of the battery is not less than the preset state of charge (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 does not limit the maximum speed. If yes, the battery management system (BMS) 1 feeds back the information that the state of charge (SOC) of the battery is less than the preset state of charge (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum speed, thereby reducing the driving resistance of the vehicle and achieving energy-saving effect, so as to increase the cruising range of the pure electric vehicle. In addition, while limiting the maximum speed, the low-speed acceleration performance, obstacle crossing ability and climbing ability of the vehicle can also be ensured.

[0047] When the battery management system (BMS) 1 feeds back information that the state of charge (SOC) of the battery is less than a preset state of charge (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum vehicle speed, the vehicle controller (VCU) 2 obtains the real-time vehicle speed of the vehicle and judges the relationship between the limited maximum vehicle speed and the actual vehicle speed. If the vehicle controller (VCU) 2 judges that the limited maximum vehicle speed is greater than the actual vehicle speed, and the value of the part X is not less than the first value threshold, then the vehicle controller (VCU) 2 controls the battery 5 to output power P1 to the motor controller (MCU) 3, and the motor controller (MCU) 3 drives the motor 4. If the vehicle controller (VCU) 2 judges that the limited maximum vehicle speed is greater than the actual vehicle speed, and the value of the part X is less than the first value threshold, then the vehicle controller (VCU) 2 controls the battery 5 to output power P to the motor controller (MCU) 3, and the motor controller (MCU) 3 drives the motor 4, wherein P=0.1P1X, 0≤X<10. That is, the endurance of the pure electric vehicle can be improved.

[0048] The application is described above with reference to the drawings. Obviously, the specific implementation of the application is not limited by the above manner. As long as various non-essential improvements are made by adopting the method concept and technical solutions of the application, or the above-mentioned concept and technical solutions of the application are directly applied to other occasions without improvement, they are all within the protection scope of the application.

Claims

1. A method for managing and controlling the power consumption of a pure electric vehicle, characterized by: The method comprises the following steps: Step 1: The battery management system (BMS) determines the available discharge power of the battery; Step 2: The vehicle controller unit (VCU) determines the power required for the high-voltage accessories to operate and feeds it back to the battery management system (BMS); Step 3: The battery management system (BMS) calculates the maximum power P1 that the battery can output to the motor controller (MCU) and feeds it back to the vehicle control unit (VCU); Step 4: The battery management system (BMS) determines whether the battery state of charge (SOC) is less than a preset SOC threshold. If so, it feeds back information indicating that the battery state of charge (SOC) is less than the preset SOC threshold to the vehicle control unit (VCU). The vehicle control unit (VCU) limits the maximum vehicle speed. Step 5: The vehicle controller (VCU) determines the relationship between the maximum speed limit and the actual vehicle speed, and controls the power output from the battery to the motor controller (MCU) based on the determination result. If the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual vehicle speed, and the value X of the greater portion is not less than a first numerical threshold, the vehicle controller (VCU) controls the battery to output power P1 to the motor controller (MCU), and the motor controller (MCU) drives the motor. If the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual vehicle speed, and the value X of the greater portion is less than the first numerical threshold, the vehicle controller (VCU) controls the battery to output power P to the motor controller (MCU), and the motor controller (MCU) drives the motor. Where P = 0.1P1X, 0≤X<10.

2. A method for controlling power management of a pure electric vehicle according to claim 1, characterized in that: The preset battery state of charge (SOC) threshold is 30%.

3. The method for controlling power management of a pure electric vehicle according to claim 1, wherein: The maximum speed limit is 60Km / h.

4. A pure electric vehicle power management and control system applicable to the pure electric vehicle power management and control method according to any one of claims 1 to 3, characterized in that: It includes a battery management system (BMS), a vehicle control unit (VCU), a motor controller (MCU), a motor and a battery. The battery management system (BMS) is connected to the vehicle control unit (VCU) and the battery respectively; the vehicle control unit (VCU) is connected to the motor controller (MCU); and the motor controller (MCU) is connected to the motor and the battery respectively.

5. A pure electric vehicle power management and control system as claimed in claim 4, characterized in that: The battery management system (BMS) determines the available discharge power of the battery, the vehicle controller (VCU) determines the power required for the operation of high-voltage accessories and feeds it back to the battery management system (BMS), and the battery management system (BMS) calculates the maximum power P1 allowed for the battery to output to the motor controller (MCU) and feeds it back to the vehicle controller (VCU).

6. A pure electric vehicle power management and control system as claimed in claim 5, characterized in that: The battery management system (BMS) determines whether the battery state of charge (SOC) is less than a preset battery state of charge (SOC) threshold. If so, it feeds back information that the battery state of charge (SOC) is less than the preset battery state of charge (SOC) threshold to the vehicle controller (VCU). The vehicle controller (VCU) limits the maximum vehicle speed, determines the relationship between the limited maximum vehicle speed and the actual vehicle speed, and controls the power output from the battery to the motor controller (MCU) based on the judgment result.

7. A pure electric vehicle, characterized by: The pure electric vehicle manages and controls the power of the pure electric vehicle using the pure electric vehicle power management and control method according to any one of claims 1 to 3.

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