高压共轨柴油机起动工况的轨压控制  

Rail Pressure Control in Starting Process for High Pressure Common Rail Diesel Engine

作　　者：李捷辉[1] 陈海龙 LI Jiehui;CHEN Hailong(School of Automotive and Traffic Engineering,Jiangsu University,ZhenJiang 212013,China)

机构地区：[1]江苏大学汽车与交通工程学院

出　　处：《车用发动机》2019年第5期57-62,68,共7页Vehicle Engine

摘　　要：在柴油机起动过程中,多变的外界环境和高压油泵工作特性易导致轨压上升滞后和异常波动,直接影响发动机的起动性能,为此,精确控制起动轨压是提高发动机整体性能的关键。本研究以控制起动轨压为目标建立控制模型,通过与AMESim软件构建的高压共轨喷射系统物理模型联合仿真,验证控制器的性能。控制模型以燃油进出共轨管质量守恒原理为基础,建立轨压-计量阀(MeUn)流量计算模型,替代PID控制器完成高精度轨压控制。联合仿真迭代计算结果表明:起喷压力建立迅速,过渡工况轨压未出现超调,怠速稳态工况轨压波动幅值在±1MPa以内。During the starting process of diesel engine, the variable external environment and the working characteristics of high pressure fuel pump were likely to cause the rail pressure rise hysteresis and abnormal fluctuation which directly affected the starting performance of engine. Controlling the starting rail pressure precisely was hence the key to improve the overall performance of engine. The control model was established to control the starting rail pressure and its combined simulation with the physical model of high pressure common rail injection system constructed with AMESim software verified the controller performance . The control model built the rail pressure-metering valve (MeUn) flow calculation model based on the conservation principle of fuel mass from and into rail pipe and realized the high-precision rail pressure control instead of PID controller. The co-simulation iterative calculation results show that the start-up pressure establishes rapidly, the rail pressure does not overshoot in the transient conditions and the rail pressure fluctuation at idle is within 1MPa.

关 键 词：柴油机 高压共轨系统 起动 轨压控制 

分 类 号：TK423.7[动力工程及工程热物理—动力机械及工程]