Research On The Performance And Response Optimization Of Electronic Controlled Diesel Injector

With With the global energy shortage and the increasingly serious problem of engine exhaust emissions,it is imperative to implement efficient and low pollution diesel engine.The improvement and development of high-pressure common rail fuel injection system is still an important direction of diesel engine development.A good high-pressure common rail fuel injection system can effectively improve the power,economy and environmental protection of diesel engine.Based on the analysis of the development process of the high-pressure common rail fuel injection system of the electronic controlled diesel engine and the research situation at home and abroad,this paper uses the numerical simulation method to analyze the factors that affect the response performance of the high-pressure common rail fuel injector of the electronic controlled diesel engine,and uses the genetic algorithm to optimize the response performance of the injector,and finally gives the optimization scheme.Firstly,this paper introduces the structure and working principle of the high pressure common rail fuel injection system of the electronic controlled diesel engine,analyzes the influence of the response characteristics of the injector on the working performance of the diesel engine,and gives the evaluation index of the response performance.According to the actual needs of the electronic control diesel engine high-pressure common rail fuel injector made some simplified assumptions,on this basis,the corresponding mathematical model is established.AMESim software is used to establish the simulation calculation model of high-pressure common rail injector of electronic controlled diesel engine,and the results show that the calculation error is within the allowable range of engineering calculation and can meet the requirements of simulation.Secondly,based on the simulation model,the influence of common rail pressure,injection pulse width,inlet hole diameter,outlet hole diameter,control cavity volume,needle spring preload,needle spring stiffness,maximum lift of control valve,inlet flow coefficient,outlet flow coefficient and injection hole flow coefficient on response performance is analyzed in detail,and the optimization of injection performance is analyzed The structure of the oiler provides a reference.Finally,this paper uses genetic algorithm to optimize the objective function ofthe minimum time of needle valve opening and arrival and the minimum time of needle valve closing and seating.The results show that the overall response performance of needle valve is the best when the other parameters are unchanged,the preload of needle valve spring is 62.176 n,the diameter of inlet port is 0.2506 mm,the diameter of return port is 0.29 mm,and the maximum lift of control valve is 0.06 mm The dynamic response performance of the injector needle valve is 32.79% higher than that before optimization.