Torque control method for electric vehicle

Abstract

The invention discloses a torque control method for an electric vehicle. The torque control method comprises the following steps of: S1, obtaining the opening degree R of a rotating handle, a voltagevector US and a bus current IDC through sampling; S2, according to the opening degree R of the rotating handle, calculating a rotating handle torque instruction IS-REF1 through a motor torque externalcharacteristic curve equation; S3, performing calculating according to the bus current IDC to obtain a current torque instruction IS-REF2; S4, performing calculating according to the voltage vector US to obtain a speed torque instruction IS-REF3; and S5, taking the handlebar torque instruction IS-REF1 obtained in the step S2 as main torque output, taking the current torque instruction IS-REF2 obtained in the step S3 and the speed torque instruction IS-REF3 obtained in the step S4 as limiting quantities, and performing calculating to obtain a target torque instruction IS-REF, wherein the calculation formula of the target torque instruction IS-REF is as follows: the target torque instruction IS-REF=Min[IS-MAX, IS-REF1, IS-REF2, IS-REF3,...].

Description

technical field [0001] The invention relates to the field of motor vector control, in particular to an electric vehicle torque control method. Background technique [0002] With the increasing demand for electric vehicles, people have higher requirements for the riding acceleration experience of electric vehicles, and various performance indicators have been proposed in terms of acceleration time and acceleration effect. The mainstream speed regulation scheme in the existing electric vehicle market is to calculate the target speed according to the opening of the handlebar, and then calculate the target torque through the speed PI loop, which exists due to the uneven torque distribution corresponding to the opening of the handlebar. Therefore, it is necessary to study a method to improve the acceleration effect of electric vehicles to solve the above problems. Contents of the invention [0003] The object of the present invention is to solve the above problems and provide ...

AI Technical Summary

Problems solved by technology

The mainstream speed regulation scheme in the existing electric vehicle market is to calculate the target speed according to the opening of the handlebar, and then calculate the target torque through the speed PI loop, which exists due to the uneven torque distribution corresponding to the opening of the handlebar. Therefore, it is necessary to study a method to improve the acceleration effect of electric vehicles to solve the above problems

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