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In order to improve the injection performance of high pressure common rail fuel system and optimize the design of electronic control injector more effectively, the simulation model of high pressure common rail fuel system was built by using AMESim simulation platform, and the accuracy of the simulation model was verified by comparing with the experimental data. In this paper, the needle opening response, needle closing response and cycle fuel injection were used as performance evaluation indicators, the AMESim model was used to carry out quantitative analysis of evaluation indicators. Through quantitative analysis, the key characteristic parameters are identified and those are solenoid valve preload, control valve stem lift, control cavity oil inlet orifice diameter, control cavity oil outlet orifice diameter, needle lift and nozzle diameter.

High pressure common rail system (HRCRS) is regarded as the most promising fuel injection system. As the key element of the HPCRS, the performance of the electronically controlled common rail injector (ECCRI) determines the working ability of the diesel engines. Excellent response characteristic is an important guarantee for the ECCRI to realize ideal injection rate, which means a lot to the combustion quality for the diesel engines. In an effort to investigate the response characteristics of the ECCRI, a simulation model for high power ECCRI was presented in this article. And 8 crucial structural parameters about the response characteristics were selected as the research factors. Based on Central Composite Design of Experiment and Response Surface Method, the prediction models between the opening response time (ORT) and the closing response time (CRT) of the ECCRI and the crucial parameters were established.

In this paper, based on the design of composite magnetic circuit, a new type of high-speed electromagnetic actuator (NHSEMA) with permanent magnetic was invented, which has the characteristics of low power consumption, strong electromagnetic force and high response. Those characteristics were systematically and deeply studied by means of theoretical analysis, numerical simulation and experiment. The magnetic network topology method was proposed to subdivide the structure of the NHSEMA, and construct the static characteristics simulation model of NHSEMA, with taking into account the magnetic flux leakage and edge flux of the system. The accuracy of simulation model of the NHSEMA was verified by set up the test platform. The error is about 3.1%, which proves that the model can achieve both calculation accuracy and speed. The static electromagnetic characteristics, energy conversion and magnetic flux distribution of NHSEMA were studied by using magnetic network topology simulation model.

A novel high-speed electromagnetic actuator for electronic fuel injection system (EFIS) of diesel engine is proposed in this paper. By using a permanent magnet and an annular flange, the design of the novel actuator aims to overcome the inherent drawbacks of the conventional solenoid electromagnetic actuator, such as high power consumption and so on. A method of multi-objective optimization combined with response surface methodology and Genetic Algorithm (GA) is employed to obtain the optimal design of the novel actuator. First, combined with design of experiments and finite element analysis, the second order polynomial response surface models (SOPRSM) of electromagnetic forces are produced by the least square principle. Second, the complete multi-objective optimization mathematical model (MOMM) of the novel actuator based on SOPRSM is built, aiming to maximize the net electromagnetic force on the armature and minimize the drive current.

Electronic in-line pump system (EIPS) is an electronic controlled fuel injection system which meets China's emission regulations. In this paper, a numerical model of EIPS was developed in AMESim for the purpose of creating a tool for simulation experiments. Experiments were conducted at the same model conditions to validate the model. The results are quite encouraging and in agreement with model predictions which imply that the model can accurately predict the dynamic injection characteristics of EIPS. The design of experiments was performed using a 2-level-5-factor face-centered central composite design (FCCD) method in order to study the interactive effect of factors on fuel injection quantity fluctuation (FIQF). The factors studied were supply fuel pressure, cam linear velocity, control valve lift, needle spring pretightening force and nozzle flow coefficient.

High-speed solenoid valve (HSV) is one of the most critical components of electronic control fuel system for diesel engine, whose dynamic response characteristics have a direct impact on the key performance indicators of diesel engine. For the improvement of dynamic response speed of HSV, a design method of multi-objective optimization based on response surface methodology and genetic algorithm (GA) is employed. Firstly, the finite element model (FEM) of HSV was developed and verified. Secondly, the second order polynomial response surface model (RSM) of the electromagnetic force was constructed by the method of optimal latin hypercube design along with the FEM of HSV, taking the key structural parameters of armature and iron core as variables. Then the multi-objective optimization mathematical model (MOMM) of HSV based on RSM was analyzed and established, taking the electromagnetic force and the mass of armature as objectives.