Electric car driving motor torque closed-loop control method

Abstract

The invention relates to an electric car driving motor torque closed-loop control method. The electric car driving motor torque closed-loop control method is composed of a whole vehicle control unit,a motor controller, an inversion switching circuit, a permanent magnet synchronous motor, a position sensor and a three-phase current sensor. The electric car driving motor torque closed-loop controlmethod is characterized in that whether active short circuit control is carried out according to an active short circuit control instruction (ASC-Enable) and the motor mechanical rotating speed, the output torque of the permanent magnet synchronous motor is calculated by means of an active short circuit method without depending on motor parameters such as stator resistance, rectangular axis voltage and the like, and the calculated value is more accurate; the motor controller then carries out PI regulation control according to a torque command emitted by the whole vehicle control unit and the torque on-line calculated value, the accuracy of the torque output absolute value can be improved, and the torque closed-loop response time is shortened.

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...

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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

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