基于轨压瞬态压力降的高压共轨燃油喷射系统喷油量校正策略  

Fuel Injection Quantity Correction Strategy for High-pressure Common Rail Fuel System Based on Transient Rail Pressure Drop

作　　者：李雪松[1] 王尚勇[1] 孙作宇[1] 刘福水[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《车用发动机》2013年第3期79-83,共5页Vehicle Engine

摘　　要：试验研究了喷油量、发动机转速以及共轨压力对高压共轨燃油喷射系统轨压瞬态压力降低幅值变化规律的影响。研究结果表明,瞬态轨压在喷油器启喷后会明显下降,且降低幅值与喷油量、发动机转速以及共轨压力均密切相关。基于喷油量、发动机转速以及共轨压力对轨压瞬态压力下降现象的影响规律,制订了循环喷油量的校正策略,试验结果表明,该控制策略可以有效提升循环喷油量的均匀性并相应地大幅改善发动机的循环变动。Influences of fuel injection quantity, engine speed and common rail pressure on transient rail pressure drop of high- pressure common rail fuel system were researched through the experiment. The research result shows that the transient rail pressure has an obvious drop after the injection starts and the drop amplitude has close relationship with fuel injection quantity, engine speed and common rail pressure. Based on the influences of fuel injection quantity, engine speed and common rail pres- sure on transient rail pressure drop, the correction strategy of cycle fuel injection is established. The further experiment shows that the strategy can improve the uniformity of cycle fuel injection and the cycle-to-cycle variation to a great extent.

关 键 词：高压共轨 燃油喷射系统 瞬态压力降 循环喷油量 校正策略 

分 类 号：TK421.44[动力工程及工程热物理—动力机械及工程]