高压共轨燃油系统轨压控制策略研究  

Research of Rail Pressure Control Strategy on Common Rail Fuel System

作　　者：仇滔[1] 雷艳[1] 彭璟[1] 李旭初[1] 

机构地区：[1]北京工业大学环境与能源学院,北京100124

出　　处：《内燃机工程》2013年第2期83-87,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(51006012)

摘　　要：建立了高压共轨燃油系统的物理模型,理论分析得出高压共轨燃油系统内轨压的主要影响因素是发动机转速、喷油量及当前油轨压力。以这3个因素为自变要素,采用查表的方法建立了前馈控制逻辑;以泵油量作为PID反馈修正自变量,改进了PID反馈控制,形成柴油机高压共轨轨压控制的策略,并进行了试验验证。研究结果表明:采用改进的闭环控制方法,降低了稳态轨压的波动,在油泵转速950 r/min,最大循环喷油量230 mg的工况下,目标轨压为160 MPa时,轨压波动由±3 MPa左右减小到±0.3 MPa左右;动态控制时超调量减小了约5 MPa,稳定时间也缩短约0.05 s。A high pressure common rail injection system model based on lumped parameter method was built up and used to analyse main factors influencing rail pressure fluctuation in commonrail system. It was concluded that they were engine speed, injected fuel delivery and current rail pressure. Then the feedforward control logic was designed by adopting maps with the three factors as independent variables. Furthermore, the PID feedback control strategy was improved by taking the pumped delivery as revised PID feedback variable. Finally the control strategy for the highpressure common rail system was completed and verified experimentally. The results show that by adopting the improved closedloop control method, the rail pressure fluctuation in steady state conditions can be reduced from about ±3 MPa to about ±0. 3 MPa while pump speed 950 r/min, max. cyclic injection delivery 230 mg/cyc and set rail pressure 160 MPa; the transient overshoot is reduced about 5 MPa, stabilization time is shorten about 0. 05 s.

关 键 词：内燃机 柴油机 高压共轨 轨压 控制 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]