Electric vehicle open-loop parking-on-slope control system

Abstract

The invention provides an electric vehicle open-loop parking-on-slope control system. The electric vehicle open-loop parking-on-slope control system comprises a vehicle controller and a motor controller. The vehicle controller obtains the opening degree pe of an accelerator, the maximum allowable request torque Max_T is obtained, and the request torque T is set to be the product of Max_T and pe, namely T= Max_T *pe; whether an vehicle slips on the slope or not is determined by judging spd; when spd is larger than 0, the request torque T is unchanged; the duration time when spd is equal to 0 is set as cnt, and when a motor enters into the blocking rotating state, the new request torque T1 of the motor controller is set to be 0; when spd is smaller than 0 and the vehicle reversely slips, the acceleration a of the motor is obtained, wherein the acceleration a meets the relation of a=(spd-last_spd) / P; the torque acceleration rate acc is calculated and meets the relation of acc=tab[a]; the new torque request T1 meeting the relation of T1=T+acc is obtained; judgment is conducted according to the magnitude of T1 and Max_T, and T1 is set to be Max_T; and an inverter of the motor controller conducts vector control on the motor through T1 to achieve the open-loop parking-on-slope function. Only the vehicle controller and the motor controller need to be closely matched and adopt traditional open-loop control, thus the parking-on-slope function is achieved, large amount of parameter debugging of closed-loop control is omitted for open-loop control, and stability and reliability are achieved.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to an open-loop parking slope control system for electric vehicles. Background technique [0002] Standing slope control needs to judge the standing slope condition. Traditional cars are equipped with expensive slope sensors for standing slope recognition. In the standing slope control, cumbersome closed-loop speed control is used. When the weight of the vehicle changes, parameter correction is often required, which increases the control The burden of the controller also increases the instability of the system. Contents of the invention [0003] In order to solve the above technical problems, the invention provides an open-loop parking control system for electric vehicles, which includes a vehicle controller and a motor controller, and the vehicle controller and the motor controller are connected through a CAN bus; [0004] The vehicle controller collects the throttle signal an...

AI Technical Summary

Problems solved by technology

[0002] Standing slope control needs to judge the standing slope condition. Traditional cars are equipped with expensive slope sensors for standing slope recognition. In the standing slope control, cumbersome closed-loop speed control is used. When the weight of the vehicle changes, parameter correction is often required, which increases the control The burden of the controller also increases the instability of the system

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