Motor control torque correction method, correction system and vehicle

Abstract

The invention discloses a method and system for correcting motor controlling torque and a vehicle. The method includes the steps of providing a motor standard parameter list and a first corresponding relation list of control current and motor mechanical torque, operating the motor according to the predetermined conditions, measuring and calculating the motor during the operation period to obtain the current parameter list of the motor, correcting the corresponding relation list of control current and motor mechanical torque according to the difference of the current parameter list and the standard parameter list to obtain a second corresponding relation list of control current and motor mechanical torque. Motor torque control and actual torque measuring and calculating are improved, and the motor torque control is thus more accurate.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a correction method and a correction system for motor control torque. Background technique [0002] At present, the control of the output torque of the motor system on the new energy electric vehicle is realized through the motor bench test calibration. The specific method is as follows: after the motor electromagnetic scheme and mechanical structure are frozen, build a motor test bench to measure and calculate the motor parameters. At the same time, test the relationship between the output torque of the motor and the control current, and make a data table. When the motor controller receives the command torque from the vehicle torque control unit, it outputs the control current according to the data table measured on the bench, and then converts the current value measured by the three-phase current sensor at the output end of the IGBT into the control current value. It then lo...

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Problems solved by technology

[0003] The mechanical torque under the current algorithm has the following problems: The motor torque and control current correspondence table obtained by the bench test is only for the test motor at that time, but due to the consistency of the motor after mass production, the parameters of the motor cannot be guaranteed to be completely consistent Therefore, there will be a certain deviation in the torque control; at the same time, because the measured actual torque is also obtained by looking up the table, there will also be a certain deviation between the mechanical torque of the motor fed back by the motor control and the actual torque executed by the motor.

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