Structural Design And Numerical Simulation Of Internal Combustion Generator With Four - Stroke Free Piston

With the shortage of resources and environmental pollution becoming more severe, the free-piston generator has caused great concern from many research institutes at home and abroad because of its good energy conservation and environmental protection, high power density, low manufacture and maintenance costs, good fuel flexibility and some other potential advantages.A novel opposed four-stroke free-piston generator is designed and simulated in this paper in view of the severe mechanical vibration of the current four-stroke free piston generator during its work. The physical simulation model of the novel generator has been established using differential equations of kinetics and thermodynamics and operating strategies have been developed on the basis of the analysis of its structure and operating principle, and accomplishes the simulation research of its running process. The dynamic variations of displacement, velocity and pressure in the cylinder were given out. Furthermore, I studied the dynamic balance and parameter characteristics of the system. The structure of the virtual prototype has been designed. Presents a new type of valve train can be applied by analyzing the overall arrangement and the working characteristics of the novel generator. Besides, we optimized the size of key components and parts, and tried to machine, with the assembly and movement check of the virtual prototype.The results show that the opposed four-stroke free-piston generator raised in the paper is feasible, and can be a new development and study direction to have a deeper and wider research on theory and prototype tests. The four-stroke free piston generator with opposed pistons has higher work frequency and power density, lower mechanical vibration, and good dynamic balance characteristic relative to the available generator with a single piston. It is a very ideal choice for future vehicle power supply for HEV.