Electric vehicle double-speed automatic transmission electronic control unit and control strategy

Abstract

The invention relates to an electric vehicle double-speed automatic transmission electronic control unit and a control strategy. The transmission control unit (TCU) comprises a single chip microcomputer, a power circuit, a pulse signal conditioning circuit, a Hall circuit conditioning circuit and a rotating speed signal frequency dividing circuit connected with a single chip microcomputer TIM module, a switching signal conditioning circuit and a motor direction control circuit connected with a single chip microcomputer universal I / O (Input / Output) module, an analog signal conditioning circuitconnected with a single chip microcomputer A / D (Analog-Digital) module, a one-way CAN (Controlled Area Network) communication signal conditioning circuit connected with a single chip microcomputer CANmodule, a PWM (Pulse-Width Modulation) drive circuit connected with a single chip microcomputer PWM module, a double-circuit SCI (Serial Communications Interface) communication signal conditioning circuit connected with a single chip microcomputer SCI serial port, a reset circuit and a crystal oscillation circuit. The universality, the reliability and the anti-interference of a hardware system are higher, so that a controller structure is more compact, the isolation communication and the on-line data modification of different types of signals can be realized, correct gear shift is ensured, the requirements on a dynamic property and economy of a whole vehicle are met, and the costs of a drive motor and a control system are reduced.

Description

technical field [0001] The invention belongs to the technical field of pure electric vehicles, in particular to a hardware assembly of a two-speed mechanical automatic transmission (e-2AMT) electronic control unit (TCU) for pure electric vehicles and an integrated shift control strategy based on the hardware assembly . Background technique [0002] With the exhaustion of fossil energy and the continuous increase in environmental protection requirements in recent years, the field of new energy vehicles has entered a period of blowout development. Major automobile companies, research institutions and universities at home and abroad have invested in the field of new energy vehicles researching. [0003] Considering that new energy vehicles on the market, especially pure electric vehicles, have different external characteristics from internal combustion engines, most of them use single-stage transmissions. Although this approach is relatively mature and helps reduce costs, it ...

AI Technical Summary

Problems solved by technology

Although this method is relatively mature and helps to reduce costs, it also puts forward high requirements on the speed and power of the drive motor, because the vehicle must meet the specified acceleration performance, maximum driving speed and mileage.

At the same time, the performance of the motor cannot be fully utilized by using a single-stage transmission, and the selection of the transmission ratio often cannot maximize the low-speed acceleration capability and the maximum vehicle speed of the car at the same time.

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