Modelling and Composite Control of Fuel Quantity Actuator System for Diesel Engines ?

摘要

Fuel quantity actuator is a core component in electronically controlled distributor pump which is used to control the fuel injection quantity for diesel engines. In the fuel quantity actuator system, there exist nonlinearities, disturbances and only the position angle can be measured directly. Previous researches usually neglect the nonlinearities of the system and obtain the angular speed by taking the derivative of the position angle. However, it is difficult for linear output feedback controllers to achieve high performance in the nonlinear system. Thus, it is essential to compensate the influence of system nonlinearities and disturbances. This paper establishes the mathematical model of the fuel quantity actuator system and presents an extended-state-observer(ESO)-based backstepping control (BSC) approach. And the stability analysis is provided to show that the closed-loop system is asymptotically stable in the presence of the lumped disturbance. While providing a superior property of transient performance, the proposed control strategy reveals a promising disturbance rejection performance as well. Both feasibility and efficiency have been validated by experiments based on the dSPACE real-time control test setup.