柴油机电控组合泵高低压系统的解耦分析

Decoupling Analysis on High-Low Pressure System of Electron-Controlled Assembly Injection Pump

在AMESim中建立了电控组合泵单缸及多缸系统计算模型,通过数值仿真和试验测试相结合的方法进行研究。研究表明,电控组合泵高低压系统的强耦合作用引起单缸、多缸循环喷油量波动及系统在配置长高压油管时的不正常喷射现象。针对此问题提出增加阻尼出油阀和改善低压供油压力的高低压系统解耦方法,并且利用AMESim计算确定了出油阀关键结构参数及全工况平面内的临界低压充分供油压力map图。对解耦方法的试验验证结果表明:带出油阀后,高压系统对低压系统的敏感性降低;系统在配置长高压油管时,随着喷油脉宽增加,喷射压力波形均无穴蚀现象产生。

Single cylinder and multi-cylinder models for electron-controlled assembly pump （ECAP） were established in AMESim environment. Through numerical simulation and test measurement, it was found that the strong coupling of high-low pressure system caused single cylinder and multi-cylinder cycle injection quantity fluctuation and abnormal injection in the system with long injection pipe. For resulting these problems, a decoupling method adopting damping delivery valve and optimizing low feeding pressure was proposed, and delivery valve key parameters and the map of low feeding pressure threshold were calculated by AMESim modeling. Validation experiments show that after adopting damping delivery valve optimizing, the sensitivity of high pressure system to low pressure system is largely reduced and in case of long injection pipe there is not cavitation existence while IPW and injection rate shape varying.