电控柴油喷射系统初期喷油速率控制方法的研究

Research on Initial Injection Rate Control for Electronic Diesel Injection System

在分析各类喷油速率控制方法的基础上提出了一种利用柱塞泄流与电磁阀控制相结合调节初期喷油速率的新方法，介绍了该方法的控制原理和结构特点，进行了喷油速率控制的匹配试验，研究了泄流槽尺寸、转速和喷油定时等对喷油速率特性的影响。研究结果表明，该方法在时间控制式电控柴油喷射系统中对初期喷油速率以及高速小油量的控制方面具有实际有效的作用。

Injection rate control is considered as an effective way to optimize diesel combustion process,decrease emission and improve fuel economy.The electronic control of fuel injection process provides the feasibility of injection rate shaping.There are many injection rate shaping devices,but most of them still suffer from structure complexity and parameter sensitivity which limit their effectiveness and practicality.A new initial injection rate control method is introduced in this paper.The basic idea of this method is to maintain a small spill passage between plunger chamber and inlet port during initial injection period.This method has the advantages of simple construction,flexible adjustment and stable performance.The experimental research at a special pump test rig was carried out.Different sizes of the small spill passage in pump were compared and selected according to their effect on injection characteristics.The test results indicate that this method is effective on the control of initial injection rate and small injection quantity at high speed in solenoid controlled diesel injection system.