Research On Modeling And Disturbance Rejection Control For Fuel Quantity Actuator System Of Diesel Electronic Controlled VE Pump

Diesel engine is playing a more and more important position in the motor power for its merits such as high combustion efficiency,high power density,low fuel consumption and strong applicability.The electronic controlled fuel injection system of diesel engine has also become one of the important development directions in the control field of diesel engine.With the use of electronic control technology,the power and economy of the diesel engine will be improved and the harmful emission of diesel engine will be reduced.The implementation of the position type electronic control on the VE distribution pump has less change to the original oil supply system and the development period is shorter,which is more suitable for the current national conditions in China.The fuel quantity actuator in the electronic controlled VE pump controls the flow of fuel into the engine.The basic principle of the fuel quantity actuator is to drive the rotation of control shaft by rotating the electromagnet,and use the eccentric ball's eccentric relation to drive the pump fuel volume directly to adjust the left and right movement of the sliding sleeve,change the effective stroke of the oil supply and control the fuel supply quantity.In this paper,the performance improvement of fuel actuators control system in electronic controlled VE pump of diesel engine is studied.Various advanced control schemes are put forward from different angles through modeling of oil actuator system,so as to achieve the improvement of the performance of the fuel quantity actuator closed loop system,and complete the simulation and experimental verification of the scheme.In this paper,the mechanical structure and basic electromagnetic principle of the fuel quantity actuator are introduced,the nonlinear characteristics of the fuel quantity actuator are analyzed,and the mathematical model of the fuel quantity actuator is established.On this basis,the fuel quantity actuator system control scheme based on linear feedback control is studied.The analysis shows that the performance of the system is not satisfactory under the influence of the nonlinear term and the external disturbance.Therefore,a compound control scheme based on nonlinear feedback and disturbance observation compensation for fuel quantity actuator is proposed.This control scheme designs the corresponding feed forward compensation through the disturbance observer observation and the nonlinear term existing in the system.The simulation results verify that the dynamic and steady state characteristics of the system are all improved.The effectiveness and feasibility of the scheme are verified by the fuel pump test bench and engine bench test.In engineering applications,the position data collected by the sensor in the fuel quantity actuator system is usually affected by the noise.In this paper,an extended kalman filtering algorithm is applied to the nonlinear system of fuel quantity actuators to filter the position signal of the sliding sleeve with noise.First,the theoretical basis and algorithm implementation of kalman filtering and extended kalman filtering are introduced.Secondly,the corresponding extended kalman filtering algorithm is designed for fuel quantity actuator system.The simulation results show that the influence of the noise of the fuel quantity actuator system on the position of the sliding sleeve will be greatly reduced by extending the kalman filtering algorithm.The control accuracy of the system will be improved and the steady-state performance of the system will also be improved.