电磁阀驱动电流对喷油特性影响规律研究

Effects of Solenoid Valve Drive Current on Fuel Injection Characteristics

在电控单体泵实验台上进行了不同电磁阀驱动电流对喷油特性影响的实验研究.讨论了单体泵燃油系统控制信号、驱动电流、油管压力、喷油速率和针阀升程各参数之间的延迟关系,探讨了不同的保持和开启电流时喷油量的变化规律.结果表明,不同的开启和保持电流对燃油系统喷油持续期长度等喷油特性影响很大,驱动电流与燃油系统的喷油速率、喷油压力、针阀升程和喷油量存在着规律性的变动.因此,不同电磁阀均需确定最优的开启和保持电流,降低驱动电流对燃油系统喷射特性产生的影响.

An experimental study about the effect of solenoid valve drive current on fuel injection characteristics was carried out on an electronic unit pump（EUP） test bench. Firstly, the delay relationships among all parameters of EUP fuel injection system were investigated, including control signal from the ECU, drive current, pressure at high-pressure pipe, injection rates and needle lift. Then, variations of injection volume with the change of holding and opening current were explored. The experimental results show that different opening and holding current has great influence on fuel injection characteristics and it also results in the parameters＇ variation of fuel injection system with certain regularity, including injection rate, injection pressure, needle lift and injection volume. Consequently, to minimize the influence on the fuel injection characteristics, it is needed to search the optimal opening and holding current respectively for different solenoid valves.