An optimization method for the speed regulator of the driving motor under the AMT gear shift of the electric vehicle

Abstract

The invention discloses a driving motor speed regulator optimization method used in electric vehicle AMT gear changing. Cooperative work of a speed ring controller and an acceleration sensor is adopted in a speed ring PI regulator; an acceleration value a in current driving of a vehicle is obtained through the acceleration sensor; next, comparison between the acceleration value a output by the acceleration sensor and a preset acceleration threshold value K is performed; when the acceleration value a is less than or equal to the acceleration threshold value K, the output of the speed ring PI regulator is not adjusted, equivalently, the proportional element of the speed ring is output as normal; and when the acceleration value a is greater than the acceleration threshold value K, the proportional element output value is subjected to amplitude limiting by the integral element output value of the speed ring. By virtue of the driving motor speed regulator optimization method, the acting intensity of the proportional element can be lowered according to the current acceleration condition in vehicle gear changing, so that overshoot of a rotary speed ring is suppressed effectively, and a quick, accurate and smooth gear changing experience can be realized.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to an optimization method for a drive motor speed regulator under AMT shifting of an electric vehicle. Background technique [0002] When the electric vehicle is running, the TCU (Transmission Control Unit) sends out a gear shift signal in the current state according to the driver's intention. At this time, the motor speed must reach the speed value of the next gear in a short time in order to successfully control the AMT ( Automated Mechanical Transmission) to complete the shift, otherwise the shift fails. This requires speed closed-loop control. The existing algorithm is generally the PI algorithm commonly used in the industry. Its disadvantage is that when shifting gears, the output of the proportional link of the speed loop is too large, resulting in overshooting of the speed, and the speed difference when shifting is too large. It causes the internal te...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can effectively reduce the ratio when shifting gears, aiming at the problems that the single PI algorithm in the speed control of the traditional electric vehicle has overshoot, which causes the shifting time to be too long and the gears are easy to hit when shifting gears. The effect strength of the link, suppressing the overshoot of the speed ring, to obtain a fast, accurate and smooth state to complete the shifting experience The optimization method of the drive motor speed regulator under the electric vehicle AMT shifting

Images