A method for torque control of electric drive system of electric vehicle to improve torque accuracy

Abstract

The invention discloses a method for improving torque accuracy by controlling an electric automobile electric drive system torque. The method includes the steps: acquiring motor performance parametersfor torque control by a motor model in a simulating manner; acquiring testing data compared a motor control torque with a motor actual output torque in a platform testing manner; correcting the motorperformance parameters by an intelligent optimization algorithm according to the platform testing data. According to the method, Id and Iq tables for torque control are acquired by the aid of theoretical motor model simulation, the motor control torque data and the motor actual torque data are acquired according to a test, the Id and Iq tables are optimized and corrected by the intelligent optimization algorithm, torque accuracy is controlled, and a lot of time and cost for calibrating the torque are saved.

Description

technical field [0001] The invention relates to the technical field of control of an electric drive system of an electric vehicle, in particular to a method for torque control of an electric drive system of an electric vehicle to improve torque accuracy. Background technique [0002] Electric vehicles use the electric energy stored in the battery as the only energy supply. They have the characteristics of high efficiency, energy saving, low noise and zero emission, and have incomparable advantages in energy saving and environmental protection. Therefore, they have gradually become one of the important development trends of the automotive industry. As an important part of electric vehicles, the electric drive system is the key to realize the mutual conversion of mechanical energy and electrical energy. [0003] There are two main ways to achieve the motor torque control accuracy of electric vehicle electric drive system: [0004] 1. According to the theoretical motor model s...

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Problems solved by technology

[0004] 1. According to the theoretical motor model simulation, the motor performance parameters used for torque control are obtained: the disadvantage of this method is that there will inevitably be differences between the theoretical motor model and the actual model of the motor, and the simulation cannot completely simulate the actual working conditions of the motor , due to this difference, there will inevitably be deviations between the simulated motor performance parameters for torque control and the actual values;

[0005] 2. Bench actually tests the motor performance parameters used for torque control in each state of the motor: the disadvantage of this method is that the actual test of the bench requires a lot of time and resources to calibrate the motor performance parameters used for torque control

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