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A closed-loop control method for driving motor torque in electric vehicles

A drive motor, torque closed-loop technology, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve problems such as insufficient torque output, rotor temperature rise, torque output reduction, etc.

Active Publication Date: 2021-03-05
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, the patents disclosed above propose torque control methods from different angles and aspects, but the temperature rise of the rotor caused by long-term operation, which in turn leads to the reduction of torque output, has not been fully considered. In the actual application process, it is May cause problems such as insufficient torque output or reduced braking capacity

Method used

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  • A closed-loop control method for driving motor torque in electric vehicles
  • A closed-loop control method for driving motor torque in electric vehicles
  • A closed-loop control method for driving motor torque in electric vehicles

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Embodiment Construction

[0077] Embodiments of the present invention are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0078] Such as figure 1 As shown, the vehicle control unit 1 sends a torque command T to the motor controller 2 through the CAN bus cmd and three-phase short-circuit control T psc ;

[0079] The motor controller 2 is composed of a CAN instruction decomposition unit 21, a torque PI adjustment module 22, a right-angle axis current instruction generation unit 23, a right-angle axis current PI adjustment module 24, a voltage decoupling control unit 25, a space vector modulation unit 26, a position and speed processing unit 27, CLARK&PARK conversion unit 28, torque online calculation module 29 and torque limit generation module 30; the motor controller 2 controls T psc and the mechanical speed ω of the motor to judge whether to carry out active short-circuit control, while satisfying T psc is 1 and the mechanical spee...

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Abstract

The invention relates to a torque closed-loop control method of a drive motor for an electric vehicle, which is composed of a vehicle control unit, a motor controller, an inverter switch circuit, a permanent magnet synchronous motor, a position sensor and a three-phase current sensor, and is characterized in that it is based on the active The short-circuit control command (ASC_Enable) and the mechanical speed of the motor determine whether active short-circuit control is performed, and the output torque of the permanent magnet synchronous motor is calculated by the active short-circuit method, which does not depend on motor parameters such as stator resistance and orthogonal axis voltage, and the calculated value is more accurate; the motor The controller then performs PI adjustment control according to the torque command issued by the vehicle control unit and the torque online calculation value, which can improve the accuracy of the absolute value of torque output and speed up the torque closed-loop response time.

Description

technical field [0001] The invention belongs to the technical field of motor drive control, and in particular relates to a torque closed-loop control method of a drive motor for an electric vehicle. Background technique [0002] The driving motor is the main driving source of electric vehicles. For plug-in hybrid vehicles, the motor and engine drive the vehicle together; for pure electric vehicles, the motor is the only driving source. Permanent magnet synchronous motors are widely used in electric vehicles. The advantages are high efficiency, high power density and torque density, many suppliers, and rich rare earth resources in my country. The motor in the vehicle mostly adopts the torque control mode, and there are many motor control modes, such as speed, torque, voltage, and power, but the torque control mode is the main one. The core of the torque control method is MTPA (maximum torque current ratio) and field weakening control. The current torque control method has s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P21/14H02P21/20
Inventor 文彦东刘志强赵慧超暴杰张颖郭璐璐胡晶胡波
Owner CHINA FIRST AUTOMOBILE
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