CN-115946544-B - New energy automobile power control method, device and equipment and readable storage medium

CN115946544BCN 115946544 BCN115946544 BCN 115946544BCN-115946544-B

Abstract

The application provides a new energy automobile power control method, a new energy automobile power control device, electronic equipment and a computer readable storage medium. The new energy automobile power control method comprises the steps of obtaining available charge and discharge power of a battery management system, determining available charge and discharge power of a motor based on the available charge and discharge power of the battery, obtaining current efficiency of the motor and current rotating speed of the motor, calculating a current torque limit value of the motor based on the available charge and discharge power of the motor, the current efficiency of the motor and the current rotating speed of the motor, obtaining a motor torque limit value based on conversion of the available charge and discharge power of the battery, and calculating a final available torque limit value of the motor based on the motor torque limit value, the available torque limit value of the motor and a vehicle state. According to the embodiment of the application, the accurate control of the motor torque request can be realized, the overrun of the output power of the battery is avoided to the maximum extent, and the service life of the battery is prolonged.

Inventors

CAI SHAOCHU
WANG SHOUJUN
Fan sai
ZHANG CHEN

Assignees

阿尔特汽车技术股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230105

Claims (7)

1. The new energy automobile power control method is characterized by comprising the following steps of: acquiring available charge and discharge power of a battery management system; determining available charge-discharge power of the motor based on the available charge-discharge power of the battery; acquiring the current efficiency and the current rotating speed of the motor; calculating a current torque limit of the motor based on the available charge and discharge power of the motor, the current efficiency of the motor and the current rotational speed of the motor; calculating a final available torque limit of the motor based on the current torque limit of the motor, the available torque limit of the motor and the vehicle state; wherein, based on the available charge-discharge power of the battery, determining the available charge-discharge power of the motor includes: Subtracting the current power of the high-voltage accessory from the available discharge power of the battery to obtain the available discharge power of the motor; adding the current power of the high-voltage accessory on the basis of the available charging power of the battery to obtain the available charging power of the motor; respectively subtracting a safety margin from the available discharge power of the motor and the available charge power of the motor to serve as the available charge and discharge power of the motor; Comparing the actual power of the battery with the available power limit value of the battery in real time, and subtracting a safety margin from the available power limit value of the battery to obtain an overpower judgment threshold value; when the actual power of the battery is larger than the overpower judgment threshold value, starting to count time and obtaining a power correction coefficient according to the time table of the actual power of the battery exceeding the power limit value; and multiplying the power correction coefficient by the available charge and discharge power of the motor to obtain the corrected available charge and discharge power of the motor.
2. The new energy automobile power control method of claim 1, further comprising: Subtracting an offset from the overpower judgment threshold to obtain a battery level one safety power threshold; And when the actual power of the battery is smaller than the first-level safety power threshold value, stopping the over-power time timing of the battery and keeping the current timing result.
3. The new energy automobile power control method according to claim 2, characterized in that the method further comprises: Subtracting an offset from the primary safety power again to obtain a secondary safety power threshold; when the actual power of the battery is smaller than the secondary safety power threshold, the timing result is cleared, and power correction is not performed.
4. The method for controlling power of a new energy automobile according to claim 1, wherein the obtaining the current efficiency of the motor and the current rotational speed of the motor comprises: The current efficiency of the motor is determined based on the current voltage of the battery, the current rotational speed of the motor, and the current torque.
5. The utility model provides a new energy automobile power control device which characterized in that includes: The first acquisition module is used for acquiring available charge and discharge power of a battery of the battery management system; the power determining module is used for determining available charge and discharge power of the motor based on the available charge and discharge power of the battery; The second acquisition module is used for acquiring the current efficiency and the current rotating speed of the motor; The motor current torque limit value calculation module is used for calculating a motor current torque limit value based on the available charge and discharge power of the motor, the current efficiency of the motor and the current rotating speed of the motor; the motor final available torque limit value calculation module is used for calculating the motor final available torque limit value based on the current motor torque limit value, the motor self available torque limit value and the vehicle state; wherein, based on the available charge-discharge power of the battery, determining the available charge-discharge power of the motor includes: Subtracting the current power of the high-voltage accessory from the available discharge power of the battery to obtain the available discharge power of the motor; adding the current power of the high-voltage accessory on the basis of the available charging power of the battery to obtain the available charging power of the motor; respectively subtracting a safety margin from the available discharge power of the motor and the available charge power of the motor to serve as the available charge and discharge power of the motor; Comparing the actual power of the battery with the available power limit value of the battery in real time, and subtracting a safety margin from the available power limit value of the battery to obtain an overpower judgment threshold value; when the actual power of the battery is larger than the overpower judgment threshold value, starting to count time and obtaining a power correction coefficient according to the time table of the actual power of the battery exceeding the power limit value; and multiplying the power correction coefficient by the available charge and discharge power of the motor to obtain the corrected available charge and discharge power of the motor.
6. An electronic device comprising a processor and a memory storing computer program instructions; The processor, when executing the computer program instructions, implements the new energy vehicle power control method as claimed in any one of claims 1-4.
7. A computer readable storage medium, wherein computer program instructions are stored on the computer readable storage medium, and when executed by a processor, the computer program instructions implement the new energy automobile power control method according to any one of claims 1-4.

Description

New energy automobile power control method, device and equipment and readable storage medium Technical Field The application belongs to the field of new energy automobile electricity, and particularly relates to a new energy automobile power control method, a new energy automobile power control device, electronic equipment and a computer readable storage medium. Background As shown in fig. 1, in the electric vehicle power control method, a vehicle controller determines a power limiting strategy of a battery pack according to maximum allowable discharging power and maximum allowable charging power of a battery management system and current state information of an electric vehicle, sends a power limiting instruction to a motor controller according to the power limiting strategy, and the motor controller controls a motor to execute the power limiting strategy according to the power limiting instruction. In the prior art, the power limiting strategy of the battery pack is determined according to the current maximum allowable discharging power, the current maximum allowable charging power and the current vehicle state information of the battery pack, so that the charging and discharging power control is realized. However, the shortcomings of the prior art schemes are divided into 2 points to be introduced: 1. In the prior art, only the available charge and discharge power of a battery and vehicle state information are considered to confirm a power limiting instruction, the power limiting instruction and a power limiting value are sent to a motor controller, the power limiting value is not converted into a torque limiting value, the available discharge torque limiting value and the available charge torque limiting value of the motor are not considered, and the torque limiting value of the motor controller is not confirmed by all factors which comprehensively influence the torque limiting value of the motor controller; 2. In the prior art, the available power limit value of the motor controller is confirmed only according to the available charge and discharge power of the battery, the motor controller determines output torque according to the available power limit value of the battery, and the available power of the motor controller is limited when the actual power of the battery exceeds the battery power limit value, so that the purpose of adjusting the actual power of the battery is achieved, and the service life of the battery is prolonged to the greatest extent. In view of this, the present application has been proposed. Disclosure of Invention The embodiment of the application provides a new energy automobile power control method, a new energy automobile power control device, electronic equipment and a computer readable storage medium, which can realize accurate control of a motor torque request, avoid overrun of battery output power to the maximum extent and prolong the service life of a battery. In a first aspect, an embodiment of the present application provides a new energy automobile power control method, including: acquiring available charge and discharge power of a battery management system; determining available charge and discharge power of the motor based on the available charge and discharge power of the battery; acquiring the current efficiency and the current rotating speed of the motor; Calculating a current torque limit of the motor based on available charge and discharge power of the motor, current efficiency of the motor and current rotational speed of the motor; Obtaining a motor torque limit value based on battery available charge-discharge power conversion; the final available torque limit for the motor is calculated based on the motor torque limit, the motor itself available torque limit, and the vehicle condition. Further, the method further comprises: Comparing the actual power of the battery with the available power limit value of the battery in real time, and subtracting a safety margin from the available power limit value of the battery to obtain an overpower judgment threshold value; when the actual power of the battery is larger than the overpower judgment threshold value, starting counting and obtaining a power correction coefficient according to the time table look-up of the actual power of the battery exceeding the power limit value. Further, the method further comprises: and multiplying the power correction coefficient by the available charge and discharge power of the motor to obtain the corrected available charge and discharge power of the motor. Further, the method further comprises: subtracting an offset from the overpower judgment threshold to obtain a battery level one safety power threshold; And when the actual power of the battery is smaller than the first-level safety power threshold value, stopping the over-power time timing of the battery and keeping the current timing result. Further, the method further comprises: Subtracting an offset from the primary safety power