Method, system, medium and equipment for optimizing hill-holding jitter of electric vehicle

Abstract

The invention discloses a method, a system, a medium and equipment for optimizing hill-holding jitter of an electric automobile, and the method comprises the following steps: 1) when a brake pedal is not activated and the rotating speed of a motor has a negative rotating speed of more than n at a forward gear or has a positive rotating speed of more than n at a reverse gear, after the state is continuously x times, determining that the automobile slips on a slope, and entering hill-holding control at the moment; 2) selecting a corresponding PI parameter according to the rotating speed when entering the hill-holding control, and carrying out rotating speed ring P I control; wherein the rotating speeds are different when the slope holding control is started, and the corresponding P I parameters are different; and (3) when the hill-holding time reaches the locked-rotor protection time threshold value and the brake pedal or the accelerator pedal is activated, the hill-holding control is quitted. The method has the advantages that the quick response of the vehicle is remarkably improved, the backward sliding distance of the vehicle is reduced, the safety of the vehicle is improved, the response smoothness is guaranteed, shaking impact is avoided, and the NVH performance of the whole vehicle is improved.

Description

technical field [0001] The invention mainly relates to the technical field of electric vehicles, and in particular relates to a method, system, medium and equipment for optimizing the shaking of an electric vehicle on a slope. Background technique [0002] With the gradual popularization of electric vehicles, more and more stringent requirements are put forward for the comfort of electric vehicles. If an electric vehicle encounters a parking situation while driving on a slope, if the driver fails to apply the brake or pull the handbrake in time, the vehicle will slide down the slope, causing a safety risk. In order to improve driving comfort and safety, most electric vehicles use the motor output torque to achieve the function of parking on the slope, but from the detection of the speed of the sliding slope, to the adjustment of entering the parking slope, and the process of exiting the parking slope, shocks will occur and cause jitters. , The sliding distance is too long, ...

AI Technical Summary

Problems solved by technology

[0006] This patent application mainly proposes a pre-slope module, which is applied according to the speed of motor deceleration. The faster the motor decelerates, the greater the pre-slope torque will be. In the process of applying different torques according to the speed, it will inevitably cause the vehicle to slip ( The speed of the rear motor of the vehicle will be increased), and the dynamic increase of the PI output torque (that is, the compensation torque T3) will bring about non-linearity and unevenness of the output torque, causing jitter and oscillation

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