Pure electric vehicle two-speed mechanical automatic transmission shift control system and control method thereof

Abstract

The invention discloses a two-speed mechanical automatic transmission control system for a pure electric vehicle and a control method thereof. The system includes a vehicle controller, a drive motor, a speed change controller, a servo driver and a DC servo motor. The gear shifting is controlled by the number of PWM pulses. spacing, shifting quickly, accurately, and in one step, effectively avoiding the traditional method of using a displacement sensor that is easily restricted by the spatial position of the gearbox; the shifting mechanism adopts a transmission screw and a shift fork structure with a nut, which has a simple structure and accurate shifting. , and has a self-locking function; the shifting action is completed within 1 second, the shifting time is short, the pulse is constant, the shifting is accurate, in place, and the impact is small, effectively achieving fast and smooth shifting; by updating the pulse number of the global variable , realizes intelligent detection of shift intervals, ensures the accuracy and speed of each shift, and solves the problem of insufficient shift accuracy caused by manufacturing errors in mechanical structures such as shift mechanisms and gearboxes.

Description

technical field [0001] The invention relates to the technical field of automatic shift control of pure electric vehicles, in particular to a shift control system and a control method for a two-speed mechanical automatic transmission of pure electric vehicles. Background technique [0002] As a clean energy vehicle, electric vehicles are increasingly accepted and valued by people. Traditional electric vehicles use a DC motor connected to a gearbox with a fixed speed ratio, and rely on the speed regulation of the DC motor to control the vehicle's driving speed. Due to the inherent limitations of the motor torque characteristics, this type of electric vehicle often exhibits a When the torque is insufficient, it is difficult to start on ramps and potholes. Subsequently, a two-speed gearbox suitable for electric vehicles appeared. The output power and speed are adjusted through two gears with different reduction ratios, so that the electric vehicle can automatically switch to a ...

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Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a simple structure, small volume, to avoid the situation where the displacement sensor is easily restricted by the space position of the gearbox, and to facilitate the development of the gearbox in a small and precise direction, and to replace A shift control system and control method for a two-speed mechanical automatic transmission of a pure electric vehicle that is fast, stable, precise and reliable, and effectively improves the driving safety and comfort of the vehicle

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