二甲醚預(yù)混合燃燒系統(tǒng)控制閥工作特性研究
[Abstract]:In recent years, with the rapid development of automobile industry, energy shortage and environmental pollution have attracted more and more attention. It is necessary to find new engine clean alternative fuel and optimize combustion efficiency. Dimethyl ether (Dimethyl Ether, (DME) has the potential to be used as clean alternative fuel for diesel engine because of its high cetane number and zero soot emission. (Premixed Charge Compression Ignition, (PCCI) combustion, which is similar to HCCI combustion mode, has attracted great attention of scholars because of its good operation. The control valve located in the two combustion chamber channels of dimethyl ether engine is the key to realize the high efficiency PCCI combustion mode of dimethyl ether. It is particularly important to explore the design of the driving mode and the dynamic response characteristics of the control valve. First of all, combined with the working characteristics of the control valve, the electro-hydraulic control system is proposed in this paper. The composition and structure of the electro-hydraulic control system are introduced, the concrete working process of the system in dimethyl ether PCCI combustion mode is described, the mathematical model is established, and the main parameters affecting the dynamic characteristics of the control valve are analyzed. According to the actual working requirements of dimethyl ether engine, the dynamic characteristics of the control valve are analyzed. Secondly, according to the working principle of electro-hydraulic control system, the simulation model is built by using AMESim software. The influence of the main factors, such as supply pressure, hydraulic piston diameter, control valve quality, reset spring stiffness and supply tubing length, on the dynamic characteristics of the control valve and the variable control characteristics of timing and lift are revealed. The results show that the larger the hydraulic piston diameter is, the greater the maximum lift and speed of the control valve are, and the hydraulic piston diameter has a great influence on the vibration frequency of the valve at the maximum lift. The mass of the valve body has little effect on the maximum lift and speed of the control valve, but has a great influence on the amplitude of the valve at the maximum lift, the greater the stiffness of the reset spring, the smaller the maximum lift of the control valve, and the shorter the closing time. The length of tubing has little effect on the dynamic characteristics of control valve. Finally, the damping hole hydraulic braking and PID closed-loop control strategy are adopted to optimize the control valve seat impact problem. The appropriate PID control parameters are obtained by using AMESim optimization design function and genetic algorithm, and applied to the closed-loop control simulation model for simulation calculation. The results show that the positioning speed of the control valve decreases from about 2m/s to about 0.35m/s after adopting the closed-loop control strategy of damping hole hydraulic braking of throttle valve, which can meet the requirements of valve seating speed. So as to realize the flexible control of the control valve seat.
【學(xué)位授予單位】:武漢科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U464.13
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