Electric vehicle starting pretension force control method

Abstract

The invention relates to an electric vehicle starting pretension force control method and belongs to the technical field of electric vehicles. The electric vehicle starting pretension force control method comprises the steps that when a gear signal transmitted by a gear sensor is a forward gear and an on-off signal of a brake pedal is effective, a vehicle controller generates torque X, maintains the torque X for delta T and sends the torque X to a motor controller, a motor is controlled by the motor controller, and then the brake pedal is loosened; and when the gear signal transmitted by the gear sensor is a reverse gear and the on-off signal of the brake pedal is effective, the vehicle controller generates torque -X, maintains the torque -X for delta T and sends the torque -X to the motor controller, the motor is controlled by the motor controller, and then the brake pedal is loosened. By adopting the starting pretension force control method, an vehicle transmission system gap after gear engaging can be effectively eliminated, rotating speed fluctuation and vibration sound of the motor at the starting moment due to the transmission system gap are avoided, and the starting smoothness of a vehicle is improved.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, and more specifically, the present invention relates to a method for controlling the starting pretightening force of electric vehicles. Background technique [0002] Such as figure 1 As shown, in the prior art, after the whole vehicle is engaged in forward gear or reverse gear, no preload is applied (i.e. no torque is applied), and when the brake pedal is released, the creep or drive torque is directly output; Considering the clearance of the vehicle transmission system, when the vehicle is put into forward gear or reverse gear, due to the existence of the transmission system clearance, large creep or driving torque will cause instantaneous fluctuations in the motor speed accompanied by vibrations, and this speed fluctuation may It affects the starting comfort of the whole vehicle, especially the motor direct drive passenger car is more obvious. Contents of the invention [...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 As shown, in the prior art, after the whole vehicle is engaged in forward gear or reverse gear, no preload is applied (i.e. no torque is applied), and when the brake pedal is released, the creep or drive torque is directly output; Considering the clearance of the vehicle transmission system, when the vehicle is put into forward gear or reverse gear, due to the existence of the transmission system clearance, large creep or driving torque will cause instantaneous fluctuations in the motor speed accompanied by vibrations, and this speed fluctuation may Affects the starting comfort of the whole vehicle, especially the motor direct drive passenger car performance is more obvious

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