Electric vehicle hill assist start control method

Abstract

The invention relates to a hill-start assist control method for an electric automobile. The hill-start assist control method for the electric automobile comprises the following steps of detecting theworking state of an automobile during starting; judging the gear and the foot brake state of the automobile; detecting motor feedback speed of the automobile; determining the control process accordingto the motor feedback speed; if the motor feedback speed is negative, recording the actual time needed by the automobile to pass through a system default distance; controlling output command torque according to the actual time and controlling the automobile to start on the basis of the output command torque. According to the hill-start assist control method for the electric automobile, differentoutput torques can be adjusted according to known automobile situations of different loads and different slopes by using the hill-start assist control method for the electric automobile to control theelectric automobile to start; therefore, phenomenons that excessive rushing of the automobile may be caused under situations of small hills and small loads by using only one set of PI parameters andthe slope sliding distance is increased due to insufficient force under situations of big hills and large loads to cause dangers for following automobiles if only one set of PI parameters are adoptedare improved; and the safety of the automobile is improved.

Description

technical field [0001] The invention relates to the field of control of electric vehicles, in particular to the field of hill start control of electric vehicles, in particular to a control method for auxiliary start of electric vehicles on hills. Background technique [0002] With the emergence and promotion of electric vehicles, more and more people start to use electric vehicles. However, when the vehicle needs to be stopped during the climbing process and needs to be restarted, due to the influence of gravity on the vehicle, the phenomenon of sliding will occur. In the prior art, the anti-slide slope part is divided into the following two situations. 1. When the vehicle climbs a slope, there is a car in the front that needs to stop. Generally, the car is stopped in the middle of the slope by stepping on the brakes. When the vehicle needs to move forward again, release the brake, and the car will reverse backward under the action of gravity. You need to give the accelerato...

AI Technical Summary

Problems solved by technology

Although the control logic and structure of the existing technical solutions are clear and easy to implement, because it is impossible to judge different slopes and different body loads, only one set of PI parameters is used, and there will be overshoot when the load is small on small slopes, and overshoot on large slopes. When the load is loaded, the distance of the slope will increase due to insufficient output, which will cause danger to the vehicles behind

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