Study of Compound Fuzzy-PID System for Engine Speed Control of PHEV

Abstract

This paper is a research about the speed adjustment of Parallel Hybrid Electric Vehicle engine under different operating conditions. It seems that the traditional PID controller is powerless owing to nonlinear and time-varying of the engine system. This paper studies coordinated control problems of the engine by using compound fuzzy-PID control method, which greatly reduces the difficulty of the nonlinear system control and improves robustness and real-time of the control system. And dynamic model of PHEV engine is established by using kinetic equations in this paper. Compared with traditional PID and fuzzy system, it proves that compound fuzzy-PID system has a better control performance, which can meet the requirements of quick start of the engine and speed regulation under the three kinds of adjustments of engine idle speed, vehicle acceleration and speed regulation in the process of the drive mode switching.