Electric quantity management control method and system for pure electric vehicle and pure electric vehicle

Abstract

The invention discloses a battery electric vehicle electric quantity management control method and system and a battery electric vehicle, and belongs to the technical field of battery electric vehicles, and the method comprises the steps that a battery management system (BMS) calculates the maximum power P1 allowed to be output to a motor controller (MCU) by a battery and feeds back the maximum power P1 to a vehicle control unit (VCU); the battery management system (BMS) judges whether the battery remaining capacity state (SOC) is smaller than a preset battery remaining capacity state (SOC) threshold value or not, if yes, information that the battery remaining capacity state (SOC) is smaller than the preset battery remaining capacity state (SOC) threshold value is fed back to the vehicle control unit (VCU), and the vehicle control unit (VCU) limits the maximum vehicle speed; a vehicle control unit (VCU) judges the relation between the limited maximum vehicle speed and the actual vehicle speed and controls the power output by a battery to a motor control unit (MCU) according to the judgment result. According to the invention, the cruising ability of the whole pure electric vehicle can be improved.

Description

Technical Field

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

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

[0003] Patent CN108215895B discloses a pure electric vehicle recovery energy management method and management system, wherein the management method detects the battery temperature, uses the battery temperature, battery charge value and remaining electric energy conversion power value as input signals, and compares and judges with the preset battery temperature upper limit, battery temperature lower limit and battery charge threshold, thereby controlling the flow of electric energy converted after braking energy recovery; the recovery energy 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 technology disclosed in the above patent cannot improve the driving range of pure electric vehicles. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pure electric vehicle power management control method, system and pure electric vehicle in view of the deficiencies in the prior art, so as to achieve the purpose of improving the endurance of the pure electric vehicle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a method for managing and controlling the power of a pure electric vehicle, the method comprising the following steps:

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

[0009] Step 2: The vehicle control unit (VCU) determines the power required for the high-voltage accessories to operate and feeds it back to the battery management system (BMS);

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

[0011] Step 4: The battery management system (BMS) determines whether the battery remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold. If so, the information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold is fed back 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 maximum speed limit and the actual speed, and controls the power output from the battery to the motor controller (MCU) based on the determination result.

[0013] Furthermore, in step 5, if the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is not less than the 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.

[0014] Further, in step 5, if the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part 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.

[0015] Further, P=0.1P1X, 0≤X<10.

[0016] Furthermore, the preset battery remaining state of charge (SOC) threshold is 30%.

[0017] Furthermore, the maximum speed limit is 60Km / h.

[0018] The present invention also provides a pure electric vehicle power management control system, including a battery management system (BMS), a vehicle control unit (VCU), a motor control unit (MCU), a motor and a battery, wherein 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 control unit (MCU); and the motor control unit (MCU) is connected to the motor and the battery respectively.

[0019] Furthermore, the battery management system (BMS) determines the available discharge power of the battery, the vehicle control unit (VCU) determines the power required for the high-voltage accessories to work 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 control unit (VCU).

[0020] Furthermore, the battery management system (BMS) determines whether the battery remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold. If so, the information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold is fed back 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 of the battery to the motor controller (MCU) according to the judgment result.

[0021] The present invention also provides a pure electric vehicle, which uses the above-mentioned pure electric vehicle power management and control method to manage and control the power of the pure electric vehicle.

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

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

[0024] (2) In the present invention, when the battery state of charge (SOC) is less than a preset battery state of charge (SOC) threshold, the vehicle controller (VCU) will control the maximum vehicle speed, thereby reducing the vehicle's driving resistance and achieving energy-saving effects, thereby increasing the cruising range of the pure electric vehicle.

[0025] (3) In the present invention, while limiting the maximum vehicle speed, the low-speed acceleration performance, obstacle-crossing capability and grade-climbing capability of the entire vehicle can also be guaranteed.

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

[0027] This specification includes the following drawings, which show the following contents:

[0028] Figure 1 It is a flow chart of a method for electric vehicle power management control of the present invention;

[0029] Figure 2 It is a logical structure block diagram of a pure electric vehicle power management control system of the present invention.

[0030] Explanation of the reference numerals: 1. Battery management system (BMS); 2. Vehicle control unit (VCU); 3. Motor control unit (MCU); 4. Motor; 5. Battery. DETAILED DESCRIPTION

[0031] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0032] Figure 1 The present invention is a flow chart of a method for controlling the power management of a pure electric vehicle, the method comprising the following steps:

[0033] Step 1: The battery management system (BMS) 1 determines the available discharge power of the battery 5, i.e., the corresponding Figure 1 Specifically, the remaining state of charge (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 for the high-voltage accessories to work and feeds it back to the battery management system (BMS) 1, which corresponds to Figure 1 S2 in.

[0035] Step 3: The battery management system (BMS) 1 calculates the maximum power P1 that the battery 5 is allowed to output to the motor controller (MCU) 3 and feeds it back to the vehicle controller (VCU) 2, which corresponds to Figure 1 S3 in. Specifically, after receiving the information about the power required by the high-voltage accessories when working from the vehicle control unit (VCU) 2, the battery management system (BMS) 1 deducts the power required by the high-voltage accessories when working from the available discharge power of the battery 5 determined by it, and obtains the maximum power P1 allowed for the battery 5 to output to the motor controller (MCU) 3, and feeds this information back to the vehicle control unit (VCU) 2. By reserving the power of the high-voltage accessories and allocating the remaining power to the motor 4, overcurrent can be prevented.

[0036] Step 4: The battery management system (BMS) 1 determines whether the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold. If so, the information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold is fed back to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum speed, that is, the corresponding Figure 1S4 to S6 in . Specifically, after obtaining the maximum power P1 that the battery 5 is allowed to output to the motor controller (MCU) 3, the battery management system (BMS) 1 determines whether the battery remaining power state (SOC) is less than the preset battery remaining power state (SOC) threshold value. If not, the battery management system (BMS) 1 does not feedback the information that the battery remaining power state (SOC) is not less than the preset battery remaining power state (SOC) threshold value to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 does not limit the maximum speed; if less than, the battery management system (BMS) 1 feedbacks the 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) 2, and the vehicle controller (VCU) 2 limits the maximum speed, thereby reducing the vehicle's driving resistance and achieving energy-saving effects, thereby increasing the cruising range of the pure electric vehicle. In addition, while limiting the maximum speed, the low-speed acceleration performance of the vehicle, as well as the obstacle-passing and grade-climbing capabilities can also be guaranteed.

[0037] Step 5: The vehicle controller (VCU) 2 determines the relationship between the maximum speed limit and the actual speed, and controls the power output from the battery 4 to the motor controller (MCU) 3 according to the determination result. Figure 1 Specifically, when the battery management system (BMS) 1 feeds back information that the battery remaining state of charge (SOC) is less than a preset battery remaining 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 will obtain the real-time vehicle speed and determine the relationship between the maximum speed limit and the actual vehicle speed. Among them, if the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is not less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P1, and the motor controller (MCU) 3 drives the motor 4; if the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P, and the motor controller (MCU) 3 drives the motor 4, where P = 0.1P1X, 0 ≤ X < 10. That is, it can achieve the improvement of the endurance of the pure electric vehicle.

[0038] Figure 2It is a logical structure block diagram of a pure electric vehicle power management control system of the present invention, including a battery management system (BMS) 1, a vehicle controller (VCU) 2, a motor controller (MCU) 3, a motor 4 and a battery 5. The battery management system (BMS) 1 is connected to the vehicle controller (VCU) 2 and the battery 5 respectively; the vehicle controller (VCU) 3 is connected to the motor controller (MCU) 3; the motor controller (MCU) 3 is connected to the motor 4 and the battery 5 respectively.

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

[0040] In addition, the battery management system (BMS) 1 determines whether the remaining state of charge (SOC) of the battery 5 is less than a preset battery remaining state of charge (SOC) threshold. If so, the information that the remaining state of charge (SOC) of the battery is less than the preset battery remaining state of charge (SOC) threshold is fed back to the vehicle controller (VCU) 2. The vehicle controller (VCU) 2 limits the maximum vehicle speed, determines the relationship between the limited maximum vehicle speed and the actual vehicle speed, and controls the power output of the battery 5 to the motor controller (MCU) 3 according to the judgment result. Specifically, after obtaining the maximum power P1 allowed for the battery 5 to output to the motor controller (MCU) 3, the battery management system (BMS) 1 determines whether the battery remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold value. If not, the battery management system (BMS) 1 does not feed back information that the battery remaining state of charge (SOC) is not less than the preset battery remaining state of charge (SOC) threshold value to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 does not limit the maximum vehicle speed; if less than, the battery management system (BMS) 1 feeds back information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold value to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum vehicle speed, thereby reducing the vehicle's driving resistance and achieving energy-saving effects, thereby increasing the cruising range of the pure electric vehicle and improving the endurance of the pure electric vehicle. In addition, while limiting the maximum vehicle speed, the low-speed acceleration performance of the vehicle, as well as the obstacle-passing ability and hill-climbing ability can also be guaranteed. Ability; when the battery management system (BMS) 1 feeds back information that the battery remaining capacity state (SOC) is less than the preset battery remaining capacity state (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum speed, the vehicle controller (VCU) 2 will obtain the real-time speed of the vehicle and determine the relationship between the maximum speed limit and the actual speed. If the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the numerical value X of the greater part is not less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P1, and the motor controller (MCU) 3 drives the motor 4; if the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the numerical value X of the greater part is less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P, and the motor controller (MCU) 3 drives the motor 4, where P = 0.1P1X, 0≤X<10. That is, it can improve the endurance of the entire pure electric vehicle.

[0041] In this specific implementation, the preset battery remaining state of charge (SOC) threshold is 30%; the maximum vehicle speed limit is 60Km / h; and the first numerical threshold is 10.

[0042] In this specific implementation, the high-voltage accessories include an inverter, a compressor, a PTC, and the like.

[0043] In addition, the present invention also provides a pure electric vehicle, which uses the above-mentioned pure electric vehicle power management and control method to manage and control the power of the pure electric vehicle.

[0044] Functions and Effects of the Embodiments

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

[0046] After obtaining the maximum power P1 allowed for the battery 5 to output to the motor controller (MCU) 3, the battery management system (BMS) 1 determines whether the battery remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold value. If not, the battery management system (BMS) 1 does not feed back information that the battery remaining state of charge (SOC) is not less than the preset battery remaining state of charge (SOC) threshold value to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 does not limit the maximum vehicle speed; if less than, the battery management system (BMS) 1 feeds back information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold value to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum vehicle speed, thereby reducing the vehicle's driving resistance and achieving energy-saving effects, thereby increasing the cruising range of the pure electric vehicle. In addition, while limiting the maximum vehicle speed, the low-speed acceleration performance of the vehicle, as well as the obstacle-passing and grade-climbing capabilities can also be guaranteed.

[0047] When the battery management system (BMS) 1 feeds back the information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold to the vehicle controller (VCU) 2, and the vehicle controller (VCU) 2 limits the maximum speed, the vehicle controller (VCU) 2 will obtain the real-time speed of the vehicle and determine the relationship between the maximum speed limit and the actual speed. Among them, if the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is not less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P1, and the motor controller (MCU) 3 drives the motor 4; if the vehicle controller (VCU) 2 determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is less than the first numerical threshold, the vehicle controller (VCU) 2 controls to allow the battery 5 to output to the motor controller (MCU) 3 with power P, and the motor controller (MCU) 3 drives the motor 4, where P = 0.1P1X, 0≤X<10. That is, it can improve the endurance of the entire pure electric vehicle.

[0048] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for managing and controlling the power of a pure electric vehicle, characterized in that: 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 control 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 is allowed to 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 remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold. If so, the information that the battery remaining state of charge (SOC) is less than the preset battery remaining state of charge (SOC) threshold is fed back to the vehicle controller (VCU), and the vehicle controller (VCU) limits the maximum vehicle speed; Step 5: The vehicle controller (VCU) determines the relationship between the maximum speed limit and the actual speed, and controls the power output from the battery to the motor controller (MCU) based on the determination result.

2. A method for controlling the power management of a pure electric vehicle as claimed in claim 1, characterized in that: In step 5, if the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is not less than the 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.

3. A method for controlling the power management of a pure electric vehicle as claimed in claim 1, characterized in that: In step 5, if the vehicle controller (VCU) determines that the maximum speed limit is greater than the actual speed, and the value X of the greater part is less than the first value 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.

4. A method for controlling the power management of a pure electric vehicle as claimed in claim 3, characterized in that: The P=0.1P1X, 0≤X<10.

5. A method for controlling the power management of a pure electric vehicle according to any one of claims 1 to 4, characterized in that: The preset battery remaining state of charge (SOC) threshold is 30%.

6. A method for controlling the power management of a pure electric vehicle according to any one of claims 1 to 4, characterized in that: The maximum speed limit is 60Km / h.

7. A pure electric vehicle power management control system applicable to the pure electric vehicle power management control method as claimed in any one of claims 1 to 6, 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.

8. A pure electric vehicle power management and control system as claimed in claim 7, characterized in that: The battery management system (BMS) determines the available discharge power of the battery, the vehicle control unit (VCU) determines the power required for the operation of the 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 control unit (VCU).

9. A pure electric vehicle power management and control system as claimed in claim 8, characterized in that: The battery management system (BMS) determines whether the battery remaining state of charge (SOC) is less than a preset battery remaining state of charge (SOC) threshold. If so, it feeds back information that the battery remaining state of charge (SOC) is less than the preset battery remaining 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) according to the judgment result.

10. A pure electric vehicle, characterized in that: The pure electric vehicle manages and controls the power of the pure electric vehicle using the pure electric vehicle power management and control method as described in any one of claims 1 to 6.

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