混合动力车用汽油机效率模型研究

摘要

The accuracy of HEV (hybrid electrical vehicle ) engine control cannot be guaranteed because of the uncertain fuel consumption characteristic is a difficult problem. It can be resolved by the efficiency model of engine used by HEV. The theory that using the air exchange equivalent loss and the air exchange experience equivalent loss as the general efficiency model of naturally aspirated port fuel injection gasoline engine used by HEV was presented in order to determine the dynamically varied high efficient working region by theoretical analysis and by a lot of experimental investigation to a LJ491QE1 gasoline engine and a DA4G18 - AA gasoline engine. The air exchange experience equivalent loss which only used two parameters of an intake pressure and an exhaust pressure could determine the dynamically varied high efficient working region of the engines and it has better responsiveness than the air exchange equivalent loss.%混合动力车用汽油机效率模型能够解决因不确定的油耗特性导致其发动机控制准确性难以保证的难题.通过理论分析和对LJ491QE1型、DA4G18-AA型汽油机的大量试验研究,提出换气当量损失和换气经验当量损失作为通用效率模型,用于确定混合动力车用自然吸气、进气道喷射式汽油机动态变化的高效工作区理论；换气经验当量损失仅利用进气压力、排气压力两个参数,就能准确地确定自然吸气、进气道喷射式汽油机动态变化的高效工作区,并且较换气当量损失具有更好的响应性.