柴油机可变相位参数耦合对气路状态的影响

Effect of variable phase parameter coupling on gas path state of diesel engine

为研究单位附加升程持续角和单位附加升程峰值与原机气门型线峰值间隔角的耦合作用对气路状态参数的影响,以DK4A柴油机为研究对象,在发动机转速为2800 km·h^-1,50%负荷工况下,导入不同气门升程型线进行模拟.分析了单位附加升程持续角和单位附加升程峰值与原机气门型线峰值间隔角对气路状态参数影响权重的变化规律.结果表明:单位附加升程峰值与原机气门型线峰值间隔角为100°~140°,单位附加升程持续角为92°~132°,两者耦合作用对进气状态参数变化率的影响存在权重相等的情况;单位附加升程峰值与原机气门型线峰值间隔角的增加有利于增加其对气路状态参数的影响权重,且单位附加升程峰值与原机气门型线峰值间隔角对进气状态参数变化率的影响权重大于单位附加升程持续角的影响权重.

To investigate the coupling effects of unit additional lift duration angle and unit additional lift peak value with the original valve type line peak interval angle on the gas path state parameters,the DK4 A diesel engine was taken as the research object,and the different valve type lines were introduced to simulate under the engine speed of 2800 km·h^-1 and 50%load condition.The effects of unit additional lift duration angle,additional lift peak value and original valve profile peak interval angle on the weight of gas path state parameters were analyzed and discussed.The results show that the interval angle between the unit additional lift peak value and the original valve profile peak value is from 100°to 140°,and the additional lift duration angle is from 92°to 132°.The increases of the additional lift peak value and the original valve profile peak interval angle are beneficial to the increase of the influence weight on the air path state parameters,and the influence weights of the unit additional lift peak value and the original valve profile peak interval angle on the change rate of air inlet state parameters are greater than that of the unit additional lift duration angle.