Pure electric car gear shifting control system based on two-gear automatic transmission without clutch

Abstract

The invention relates to a pure electric car gear shifting control system based on a two-gear automatic transmission without a clutch. The pure electric car gear shifting control system comprises a vehicle control unit (VCU), a battery management system (BMS), a motor control unit (MCU), a transmission control unit (TCU), a power storage battery, a driving motor, the two-gear automatic transmission, a main reducer, a differential mechanism and wheels. The VCU decides whether a gear is shifted or not according to the current operating condition of a car, the BMS controls and detects the power storage battery, the MCU controls the driving motor, the TCU controls a gear shifting executing motor of the two-gear automatic transmission, and the driving motor finally acts on the wheels sequentially through the two-gear automatic transmission, the main reducer and the differential mechanism to drive the car. Compared with the prior art, according to the pure electric car gear shifting control system based on the two-gear automatic transmission without the clutch, by coordination control of the driving motor and a gear shifting executing mechanism of the two-gear automatic transmission, the advantage of rapid, smooth and steady gear shifting is achieved.

Description

technical field [0001] The invention relates to the technical field of automatic shift control of pure electric vehicles, in particular to a pure electric vehicle shift control system based on a clutchless two-speed automatic transmission. Background technique [0002] With the gradual depletion of fossil energy and the increasingly prominent environmental problems, pure electric vehicles have become one of the important development directions of new energy vehicles due to their advantages of zero emission, low noise and extensive sources of electric energy. [0003] The pure electric vehicle uses the drive motor as the power source. Because the drive motor has the characteristics of zero-speed start, low-speed high torque, high-speed constant power, and wide operating range, the pure electric vehicle can theoretically not use a transmission, but in fact it is Taking into account its power indicators (maximum vehicle speed and maximum gradient) and improving its energy econo...

AI Technical Summary

Problems solved by technology

Therefore, the control of the vehicle drive motor and the shift actuator motor during the shifting process is very important and complicated, which can easily lead to problems such as rapid wear of the synchronizer, long power interruption time, and large shifting impact.

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