Continuous Non-Singular Terminal Sliding Mode Control for High Pressure Common Rail Systems Using a FTDO

High pressure common rail (HPCR) technology has been widely applied in diesel engines. The tracking speed and the steady-state fluctuations of the rail pressure determine the performance of the HPCR system. In this paper, the fuel injection disturbance which has a main impact on rail pressure fluctuations is fully considered. Based on fluid dynamics and Newtonian mechanics, a nonlinear model of the HPCR system is established. In order to suppress the fuel injection disturbance, a finite time disturbance observer (FTDO) based continuous non-singular terminal sliding mode controller (CNTSMC+FTDO) is designed based on the three-step analysis framework. It is proved that the system tracking error can converge to the equilibrium point in a finite time. Finally, a group of simulations and experiments are conducted in Simulink and the more realistic AMESim environment respectively and the results verify the effectiveness and feasibility of the proposed algorithm.