A Control Method for Acceleration Limitation of Pure Electric Bus

Abstract

A method for controlling the acceleration limit of a pure electric public transport vehicle, comprising the following steps: (1) setting the acceleration threshold a of the vehicle max , when the vehicle is running normally a max is equal to a1, when the driver continues to step on the accelerator for time t1, a max Automatically switch to the value a2 greater than a1; (2) Calculate the vehicle acceleration a in real time; (3) When the vehicle acceleration a is greater than or equal to the set acceleration threshold a max , record the current motor torque value as the maximum torque value to limit the motor output torque; (4) set the acceleration offset to a0, if the current acceleration a <amax‑a0, the torque limit is exited. The present invention is based on a control method based on the corresponding relationship between the current torque of the motor and the acceleration, and limits the acceleration of the vehicle. When the driver has a clear and strong need for acceleration, the acceleration limit can be appropriately released. For different vehicle weights, loads, and road conditions, All have good adaptability.

Description

technical field [0001] The invention relates to the technical field of drive control of pure electric vehicles, and more specifically refers to a control method for limiting the acceleration of pure electric public transport vehicles. Background technique [0002] The traditional pure electric vehicle torque control adopts an open-loop control method, that is, the depth of the accelerator pedal determines the driving torque of the motor, and the output torque of the motor determines the acceleration of the vehicle. When the driver deeply steps on the accelerator pedal, the motor releases the maximum torque, and the vehicle can obtain the maximum acceleration under the current capability. As for public transport vehicles, it has certain particularities. During the operation of the bus in the city, there are often standing passengers on the bus. Due to the uncertainty of the driver's driving habits, the acceleration of the vehicle may be too high during the acceleration proce...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a control method for the acceleration limitation of pure electric public transport vehicles to solve certain limitations of the existing vehicle acceleration limitation. For buses with different sizes, weights and loads, it is difficult to adopt consistent PI parameters, which may cause torque Oscillations or other unexpected torque responses, etc.