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Electric vehicle motor torque adjustment method and system

An electric vehicle, motor torque technology, applied in electric vehicles, control drive, power management and other directions, can solve problems such as vehicle jitter easily

Active Publication Date: 2019-03-19
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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  • Electric vehicle motor torque adjustment method and system

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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 in conjunction with the drawings and implementations.

[0033] When an existing electric vehicle operates at low speed and high torque, such as climbing a hill at a low speed and starting with a high throttle, the motor speed is likely to fluctuate due to the road surface or other external excitation sources, resulting in poor drivability of the vehicle and poor subjective experience of the personnel. Aiming at the problem that current electric vehicles are prone to shake when starting at low speed or climbing at low speed. The invention provides a motor torque adjustment method and system of an electric vehicle, which uses the difference in the motor speed within a set time to compensate the output torque of the motor, so that the gradient of the motor speed change b...

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Abstract

The invention provides an electric vehicle motor torque adjustment method and system. The method comprises acquiring a gear signal of an 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 determining whether the motor direction and the torque direction are consistent according to the requesttarget torque message and the current gear; if so, acquiring the motor speed within the set time and calculating the speed difference within the time; determining the overall demand torque accordingto the request target torque message and judging whether the demand torque is within a preset range of the compensation torque; if so, acquiring a compensation coefficient corresponding to the motor speed and adopting a product of the speed difference and the compensation coefficient as a compensation torque value. The method and system can improve the use comfort and intelligence of the electricvehicle.

Description

technical field [0001] The invention relates to the technical field of motor control of electric vehicles, 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 index for evaluating the performance of the electric drive system. The index for evaluating the torque output is not only whether the peak torque can be output, but also the accuracy of the torque output. The controller performs closed-loop control on the output torque of the motor. Inaccurate torque output will cause the vehicle to vibrate. Therefore, the accuracy of the motor output torque is required to be high. When the vehicle is accelerating, the motor needs to output peak torque. If the peak torque cannot be reached, it will It will seriously affect the dyna...

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Application Information

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