Abstract
Based on the working characteristic of the engine and the generator, a coordination control strategy of Auxiliary Power Unit (APU) is studied for a range-extended electric vehicle (RE–EV). A regulating rule of APU control system speed and torque which meets the power demand considering battery state of charge (SOC) of the RE–EV is designed. The PID and feedforward PID control methods of engine speed are discussed by simulation analysis, and the particle swarm optimization is adopted to optimize the PID parameters. The simulation results show that the feedforward PID control can stabilize the speed to 1600r/min in 1.5 seconds, and the overshoot can be ignored. In order to investigate the APU control processing, the incremental PID and feedback PID control algorithms are used to achieve speed control in the APU test bench. The influence on control period and the working condition are analysed from test results. The coordination control strategies of engine and generator are realized and verified by experimental research.
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