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为了满足发动机设计及性能指标要求,比较分析国内外先进气门执行机构的优缺点,设计一种新型电控液压全可变气门驱动系统.在此基础上,建立气门驱动系统的数学、物理模型,借助MATLAB/Simulink计算平台搭建本系统计算仿真模型并用试验结果进行验证,保证了计算模型的可靠性.根据系统结构,详细分析了可控性参数旋转阀相位差角及蓄压器压力和发动机转速对气门最大升程、气门开启持续期、气门启闭时刻、气门速度及加速度的影响.研究结果表明,旋转阀相位差角通过改变气门开启持续期改变气门关闭时刻,但不影响气门开启段升程规律;蓄压器压力对气门最大升程有重要影响,但不改变气门开启持续期及启闭时刻;在不同发动机转速下,气门最大升程、关闭时刻均有改变;随着发动机转速的提高,气门升程断面积减小,气门关闭时刻推迟.
In order to meet the requirements of engine design and performance index, the advantages and disadvantages of advanced valve actuators at home and abroad are analyzed and compared to design a new electro-hydraulic hydraulic variable displacement valve drive system.Based on this, a mathematical and physical model of valve drive system is established, Based on the MATLAB / Simulink calculation platform, the simulation model of the system was built and validated with the test results to ensure the reliability of the calculation model.According to the system structure, the phase difference angle of the controllable parameter rotary valve and the pressure of the accumulator and the engine speed On the valve maximum lift, valve opening duration, valve opening and closing time, valve speed and acceleration.The results show that the rotary valve phase angle by changing the valve opening duration to change the valve closing time, but does not affect the valve opening segment rise The pressure of the accumulator has an important influence on the maximum lift of the valve but it does not change the valve opening duration and the opening and closing moment; at different engine speeds, the maximum lift and the closing time of the valve all change; as the engine speed Improve the valve lift cross-sectional area decreases, the valve closing time postponed.