Study on Variable Parameter Linear Active Disturbance Rejection Control for GDI Engine Common Rail Pressure

Gasoline Direct Injection(GDI) engines with Common Rail system can strongly improve the performance of engine. In order to achieve the advantages promised by this technology, the rail pressure must satisfy the pressure requirement. In this work a method of Linear Active Disturbance Rejection Controller(LADRC) based on the rail pressure characteristics of the common rail system is proposed. To simplify the parameter tuning process, the Genetic Algorithm was used to optimize the controller. Focus on further improve the controller performance, the method of Variable Parameter LADRC(VPLADRC) is presented in this paper. In order to verify the effect of the controller, a simulation has been done based on the ideal model of common rail system. The simulation results confirm the effectiveness of VPLADRC. This method can satisfy the rail pressure control requirement. Compared with PID control, this method can further reduce the steady-state error and has greater optimization potential.