【摘要】 提出了一种凸轮驱动式发动机全可变液压气门系统(fully hydraulic variable valve system,FHVVS),搭建了AMESim仿真计算模型,探究了泄油起始时刻、终止时刻和节流面积等因素对气门运动规律的影响,优选了FHVVS柱塞控油装置泄油节流方案。在此基础上研制了某6缸柴油机的全可变液压气门系统,并进行了相应的试验测量和模拟仿真计算。研究结果表明:随发动机转速增高,FHVVS的液压波动幅值明显增大,柱塞控油装置的节流作用对液压压力波动具有"削峰填谷"的效果;研制的FHVVS可以实现气门的最大升程、开启持续期和配气相位的无级连续可变,并具有良好的循环稳定性和气门动力学性能。更多还原

【Abstract】 A fully hydraulic variable valve system(FHVVS)driven by cam for a compression ignition engine was proposed.By establishing the simulation calculation model with AMESim,the influence of the start and end time of the oil drain,the flow area,etc.on the intake valve movement was researched,and the oil drain throttling scheme of the FHVVS plunger oil control device was optimized.On this basis,a type of FHVVS for a 6 cylinder diesel engine was developed,and corresponding test study and simulation calculations were carried out.The research results show that the hydraulic fluctuation amplitude in high-pressure system of FHVVS increases significantly with the increase of engine speed,and the throttling action of the plunger oil control device has the influence of“shaving peaks and filling valleys”on the hydraulic pressure fluctuations.Stepless and continuous change of the maximum valve lift,opening duration and valve timing can be achieved in FHVVS with good valve cycle stability and valve dynamics performance.更多还原