Battery electric vehicle slope-holding method

Abstract

The invention provides a battery electric vehicle slope-holding method. The battery electric vehicle slope-holding method is characterized by comprising a slope-holding state judging step, wherein whether a vehicle is in a slope slipping state or not is judged, a judging result when the vehicle is in the slope slipping state or in the non-slope-slipping state is obtained, and if the judging resultshows that the vehicle is in the non slope slipping state, the flow is ended or enters in the set subsequent step; a slope-holding torque initialization step, wherein if the judging result shows thatthe vehicle is in the slope-slipping state, according to the current rotating speed n, slope-holding torque is initialized; and a toque change gradient determining step, wherein after the slope-holding torque is initialized, according to the current motor rotating speed n and the actual output torque at the moment, different torque change gradients delta Trq are set. According to the battery electric vehicle slope-holding method, the advantages of being simple in logic structure and high in reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a method for parking a pure electric vehicle on a slope. Background technique [0002] When a pure electric vehicle is driving on a slope, if it encounters a traffic jam or a red light, it needs to stop and start and stop frequently. Due to the gravity of the vehicle itself, the vehicle will slide down the slope. In order to drive comfort, continuity and prevent the vehicle from slipping due to improper operation of the driver, a large number of pure electric vehicles have added a parking function. [0003] The existing slope parking device, such as a parking device for an electric vehicle disclosed in patent document CN107618486A, is used to lock the driving wheel shaft of the electric vehicle when parking, and includes a transmission system and a support plate. On the support plate, the output end of the transmission system is a push rod. The push rod passes t...

AI Technical Summary

Problems solved by technology

Although this control method increases the corresponding time of the speed loop, the parameter adaptability is not strong, and it cannot adapt to various working conditions in front of the slope, in the middle of the slope, and at the top of the slope, and vehicle vibration is easy to occur during the adjustment process;

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