Investigation On Transient Process Of Hydraulics-driving Adjustable Composite Supercharged Program

Our country has a broad distribution of plateaus, large number of vehicles run in these areas. When the vehicle is running at plateau, engine performance significantly decreased.Base on the performance decrease of power equipment, we carried out the study of the transient process of hydraulics-driving adjustable composite supercharging system.First of all, hydraulics-driving adjustable composite supercharging system is the research object of the scientific dissertation. The mathematic model was set up by using force equilibrium equation and flow continuity equation, and the system transfer function had been set up. The mathematic model was verified by the test data. The simulation model of the pump-control-model closed-circuit speed system had been built in AMESim simulation software. The influence factors to the transient performance of the system had been analyzed in simulation environment. The simulation analysis of the influence factors to the transient performance of the system had been made in MATLAB simulation software using the above two controllers. Towards the above factors, the conventional PID controller and the self-tuning fuzzy PID controller based on disturbance observer had been built up. The simulation results proved that the latter control effect was better than the former.In GT-Power software and MATLAB/Simulink software environment, a simulation platform of the hydraulics-driving adjustable composite supercharged engine was built.Based on the above simulation platform and the steady switching boundaries of compound supercharging system, the compound supercharging system transient switching process simulation is researched. This paper focuses on the intake of by-pass valve opening and closing time the transient switching process of supercharger. On this basis, the transient switching method of compound supercharging system was optimized. In the process of increasing speed at constant torque, the engine accelerating performance was optimal in the allowable working condition of composite supercharging system. Thus, in the engine speed-up process, when the initial condition was composite supercharging system, the switching boundary was expanded to the optimal switching boundary.