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Gasoline direct injection fuel injector spray Constant Volume Test System

Author: CuiHaiGang
Tutor: YangShiChun
School: Jilin University
Course: Power Machinery and Engineering
Keywords: GDI engine Spray constant volume test system Modeling and Simulation Injector Driver
CLC: TK417.4
Type: Master's thesis
Year: 2011
Downloads: 202
Quote: 0
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Abstract


With the global increase in car ownership, car industry will be faced with depleting energy sources, oil prices continued on the challenge of increasingly stringent emissions regulations. So the world's car manufacturers have invested a lot of manpower and resources, or to find new clean energy to reduce dependence on conventional oil resources, or the existing engine for technical improvements, improved fuel economy and further reduce vehicle emissions levels to deal with future challenges. The direct injection gasoline engine technology is a way to improve fuel efficiency and reduce fuel consumption rate and effective means. Cylinder direct injection gasoline engine under different operating conditions to take a different control strategies: part load, full throttle, using post-injection compression stroke control strategy, formed in the vicinity of the spark plug stratified combustible mixture, which can effectively reduce pumping losses, reducing the amount of fuel injection to improve fuel economy; heavy load, the use of early intake stroke injection control strategy in the cylinder to form a uniform combustible mixture, in order to meet the power requirements; conditions in the two-stage transition injection control strategies in order to achieve a smooth transition torque. This direct injection gasoline engine fuel injection system control strategy proposed for high demands. Post-injection in the compression stroke, the cylinder pressure is high due to the rapid formation of the desired in-cylinder air fuel mixture, require a high injection pressure to the fuel highly atomized, and injected in the intake process, the cylinder low pressure, in order to avoid the walls of the fuel, the emission deterioration can not be too high injection pressure. This strategy determines the fuel injection cylinder direct injection gasoline engine fuel injection pressure changes between the 5-12MPa. Gasoline direct injection spray characteristics of a direct impact cylinder combustible mixture formation and combustion process, the spray characteristics of the injector to improve engine fuel economy and emission levels has important significance. Constant volume spray injector test system is the study of the main means of spray characteristics. The main contents of the thesis is with China FAW Technology Center in cooperation enterprise project \According to the design requirements of the project developed a constant volume test system, which includes a container body set, intake system, exhaust system, fuel injection system, the system controller and real-time monitoring calibration software. The system back pressure and the injection jet to achieve the adjustment of the ambient temperature to simulate the environment of the engine cylinder, for the injector spray characteristic test. During the test, the container can be displayed in real time the temperature and pressure conditions, can be adjusted in real time by means of calibration software and the injection pressure and the injection parameters such as injection pulse width injector drive current. All control parameters and state data are available from the calibration software for real-time record keeping in order to facilitate the analysis of experimental data. They also developed a spray image processing software, capable of shooting during the test injection image analysis and processing, to achieve the injector spray angle, penetration distance measurement and analysis, averaging, and data storage, you can also spray image multi-cycle averaging to achieve changes in circulation and spray mist image image standard deviation calculation processing. Followed by an analysis of the direct-injection gasoline injector porous structure was established on the basis of a simplified mathematical model of the solenoid valve and the simulation model, and the model was validated analysis. Simulation results show that the amount of control solenoid valve - voltage on the solenoid valves open and close in response have a decisive role: With the excitation voltage increases, the solenoid valve opens response rate was significantly improved, but the power supply and injector high performance requirements, so drive voltage selection should weigh considered. In addition, the use of a simplified model, the simulation results obtained with the test results are quite different, further research needs to be done. Analysis of the various characteristics of the injector driver circuit for direct injection gasoline engine response characteristics of the injector requirements, design a dual voltage peak - to maintain current-drive circuit. The drive circuit in order to achieve rapid opening of the injector, the injector is turned on early, to a very high voltage of the injector, the injector coil to generate a current of about 13A or so in order to achieve the rapid injector promotion. When the injector is turned on to provide 12V car injector voltage and current feedback control by the PWM, the injector is formed in a small coil current to maintain the injector open. The drive circuit can effectively decrease the power consumption of the injector, the injector can achieve rapid response, is currently more advanced injector drive way. The difficulty lies in the high-voltage driver circuit is obtained, the realization of high-side switch tube drive current in the coil and injector loop control. Finally, the injector drive circuit verified by experiments, and in the constant volume spray designed in this paper on the test system to conduct a preliminary test spray characteristics.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Gasoline > Run test > Gasoline parameter measurement techniques and equipment
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