Optimization On Structural And Control Parameters And Development On Testing Systems Of High-speed Solenoid Valve For High-pressure Common Rail Injection System Of Diesel Engine

High-pressure common rail injection system is the advanced technology of modern electronic injection system of diesel engine; it not only enables the diesel engine to meet the increasingly strict emission criterion, but also enhances its economic efficiency and comfortability. On the basis of the project"High-pressure Common Rail Injection System for Diesel Engine"of FAW, the dissertation is an attempt to research on optimization of structural design and control parameters of high-speed solenoid valve, as well develop the static and dynamic performance testing systems of high-speed solenoid valve applicable to the design and improvement of the sample and the examination of the product's performance, by employing the joint methods of theoretical computation, computational simulation and experimental analysis. The research work in this dissertation has important theoretical and engineering application value for promoting the self-development ability on high-pressure common rail injection system in our country.The main research contents are presented as follows:(1) The analysis of the performance requirement of high-pressure common rail injection system towards high-speed solenoid valve. The mathematical model of the static electromagnetic force performance of the solenoid valve is established according to the electromagnetic theory; the solenoid valve is divided into four sub-systems: electronic, magnetic, mechanical and hydraulic; the mathematical model of dynamic solenoid valve response process is established and the hysteresis and vortex effect are studied in consideration of the actual working process of the solenoid valve.(2) Development of the simulation system of the solenoid performance on the basis of the mathematics model, and simulation research on the performance of static electromagnetic force and dynamic response of the solenoid valve of given structure and control parameters.(3) Analysis on the major structure and control parameters affecting the performance of the solenoid valve, so as to provide theoretical basis for working out its structure design and control method. Genetic algorithm is introduced to design and optimize the solenoid valve according to the regulation of the impact of the structure and control parameters on the performance of the solenoid valve; fine effect is achieved.(4) Development of the static performance testing system of the solenoid valve, including setting up the system platform, designing impulse electric current generator of the solenoid valve on the basis of magnetic balanced Hall-current sensor, and developing testing system software. The developed testing system is up to the designing standard with its high accuracy, complete functions and convenience for operation.(5) Development of dynamic performance testing system of the solenoid valve on the basis of laser displacement sensor. Including setting up system platform and measuring structure of the rigidity of pretension spring of the solenoid valve, designing the dynamic electric-current driver on the basis of power sink principal, variable pulse width modulation of voltage boosting and inversion technology, realizing the intelligence controlover the control parameters, satisfying the diversity requirement towards the dynamic feature experiment of the solenoid valve; furthermore, testing system software is developed, and filtering is conducted over the signals of armature displacement response and driving current educed from the experiment using wavelet analysis technology.(6) Experimental research on the sample of the solenoid valve; presentation of the experiment outcome and its related analysis to demonstrate its conformity to the theoretical research.