Active disturbance rejection control of common rail pressure for Gasoline Direct Injection engine

The rail pressure control in Gasoline Direct Injection (GDI) engines is considered as one of key issues for precise control of fuel injection. This paper presents a rail pressure controller based on the framework of active disturbance rejection control (ADRC). The detailed nonlinear model of the fuel injection system for GDI engine is carried out. Suitable model simplification is introduced for the controller design. According to the complex nonlinear system which contains internal uncertainties and external disturbance, a nonlinear state error feedback control and an extended state observer are applied to deal with the pressure tracking problem. Simulation results are provided to demonstrate the effectiveness of the proposed controller.