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A motor torque adjustment method and system for an electric vehicle

A technology of electric vehicles and motor torque, which is applied in the fields of electric vehicles, power management, control drive, etc., and can solve problems such as vehicle vibrations easily

Active Publication Date: 2021-02-02
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a motor torque adjustment method and system of an electric vehicle, which solves the problem that the existing electric vehicle is prone to shaking when starting at a low speed or climbing a slope at a low speed, and can improve the comfort and intelligence of the electric vehicle.

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  • A motor torque adjustment method and system for an electric vehicle

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Embodiment Construction

[0032]In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and implementation manners.

[0033]When existing electric vehicles have low-speed climbing and high-throttle starting under low-speed and high-torque conditions, the motor speed is likely to fluctuate due to road surface or other external excitation sources, resulting in poor driving performance of the vehicle and poor subjective experience of personnel. Aiming at the problem that electric vehicles are prone to jitter when starting at low speeds or climbing at low speeds. The invention provides a motor torque adjustment method and system for an electric vehicle, which uses the difference in the rotation speed of the motor rotation speed within a set time to compensate the output torque of the motor, so that the change gradient of th...

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Abstract

The invention provides a method and system for adjusting motor torque of an electric vehicle, the method comprising: acquiring a gear signal of the electric vehicle, and determining the current gear of the vehicle according to the gear signal; acquiring a request target torque message through a CAN bus , and judge whether the motor direction is consistent with the torque direction according to the request target torque message and the current gear position, if yes, obtain the motor speed within the set time, and calculate the speed difference within the time; according to The request target torque message determines the required torque of the vehicle, and judges whether the required torque is within the preset range of the compensation torque, and if so, obtains the compensation coefficient corresponding to the motor speed, and compares the speed difference The product of the value and the compensation coefficient is used as the compensation torque value. The invention can improve the comfort and intelligence of the electric vehicle.

Description

Technical field[0001]The present invention relates to the technical field of motor control of electric vehicles, and in particular to a method and system for adjusting motor torque of electric vehicles.Background technique[0002]The drive system is one of the three core components of electric vehicles, and its performance directly determines the performance of the vehicle. The torque output of the motor is an important indicator for evaluating the performance of the electric drive system. The indicators for evaluating the torque output include not only whether the peak torque can be output, but also the accuracy of the torque output; when the vehicle is in the starting phase, due to the vehicle control The motor’s output torque is closed-loop controlled by the motor. Inaccurate torque output will cause vehicle jitter. Therefore, the motor output torque accuracy is required to be high; when the vehicle is accelerating, the motor needs to output the peak torque. If the peak torque is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20
CPCB60L15/2063B60L15/2072B60L2240/421Y02T10/72
Inventor 张威
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD