Study on Structural Optimization of Fuel Electronic Injection Device for Diesel Engine

Abstract

The fuel injection devicefor diesel engine is the most important part in the combustion process, which is one of the key issues to optimize the dynamic performance, discharge and economy of diesel engine. The combustion process is directly related to the structure of electronic fuel injection device.In this paper, the fuel injection device controlled electronically by time and pressure inthe diesel engine of high pressure common rail is taken as the research object. The simulation model of injection device is established by using the simulation platformbased on Hydsim. The influence of structure optimization on the movement state of needle valve, the fuel pressure at the injection hole and the injection rate is studied. The results show that the optimized injection device can eliminate the hydraulic delay, reduce the fluctuation of injection pressure, and shorten the injection duration.And it lays the foundation for multiple injection. By the above structure optimization, the atomization effect of fuel is improved, and the purpose of improving economy and reducing emission is achieved.