缸内直喷汽油机高压油泵控制系统的设计

针对缸内直喷汽油机高压油泵工作噪声较大和高压油轨压力动态响应较慢的问题,通过对高压油泵溢流阀驱动电流的优化和泵油量控制策略的设计,使高压油泵工作噪声降低,动态响应时间缩短,当节气门开度由20%增大至50%、目标轨压由6.5 MPa阶跃至9.3 MPa时的动态响应时间仅为4s,表明该方法可行,对整个发动机燃油喷射控制系统的优化具有参考价值.

Design of High Pressure Fuel Pump Control System for GDI Engine

Aiming at the problems remaining in the gasoline direct injection (GDI) engines such as high pressure fuel pump noise and low dynamic response in high pressure fuel rail, the driving current in the pump spill valve is optimized and a control strategy of pump fuel quantity is designed to reduce the work noise of high pressure oil pump and also to shorten the dynamic response time in high pressure fuel rail. When the throttle opening increases from 20% to 50% and target fuel rail pressure from 6.5 MPa to 9.3 MPa, the dynamic response time is only 4 s. Therefore, it is concluded that the method is feasible, and it provides the reference value for optimization of engine fuel injection control system.