Electronic-controlled high pressure common rail fuel injection technology is oneof the most promising technologies of a diesel engine. Because it could reduce NOxand Soot emissions of the diesel engine and improve the fuel economy simultaneously.In the common rail system, the solenoid valve controls the injector’s action accordingto the fuel injection signal from the electronic control unit (ECU), and thus realizesthe flexible control of fuel injection. The response speed of the solenoid valve needsto be fa...