A starter power generation system for a vehicle auxiliary power unit

Abstract

The invention discloses a starting power generation system for an auxiliary power unit for a vehicle. In the engine starting process, a permanent magnet motor is subjected to constant torque control to drive an engine to ignite, and when an engine speed reaches the idle speed, the output torque of the permanent magnet motor is controlled to be zero. In the power generation process, a running speedcommand of the engine and a torque command value of the permanent magnet motor are obtained through table look-up according to a generated power request of the system and a universal characteristic curve of the engine. The engine performs closed-loop control according to a speed command value obtained by table look-up, and the stability of the engine speed is realized by adjusting the engine throttle opening degree in real time. The permanent magnet motor obtains a torque current command value through table look-up according to a torque command, and realizes the current closed-loop control through a PI regulator. According to the starting power generation system for the auxiliary power unit for the vehicle, the starting torque is stable, and the engine can be successfully started; and thequality of electric energy is high during power generation, and the fuel economy of the engine is good.

Description

technical field [0001] The invention relates to the field of pure electric or hybrid vehicles using an auxiliary power unit, in particular to a starting and generating system for an auxiliary power unit and a control method thereof. Background technique [0002] Hybrid vehicles achieve the purpose of optimizing emissions and reducing engine fuel consumption through electric power boosting, braking energy recovery and other technologies. The core part of the hybrid vehicle is the auxiliary power unit start / power generation system. Designing this system well is the focus of hybrid power. The so-called starter / generator is based on the principle of reversible operation of the motor, using the motor as a starter / generator. During the starting stage of the engine, the motor operates as an electric motor, converting electrical energy into mechanical energy, and driving the engine to run to idle speed. After a successful start, the engine can drive the motor in turn, converting mec...

AI Technical Summary

Problems solved by technology

However, whether it is a series hybrid electric vehicle or an extended-range electric vehicle, it is difficult to improve the engine, and the hybrid electric vehicle also encounters problems such as high fuel consumption and low service life of the engine.

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