Proportional fuel flow control valve for diesel vehicle

In the common rail system with direct injection equipment in diesel engine, a proportional solenoid valve to control the fuel flow into the high pressure pump is used. The proportional solenoid actuator is suitable for flow control valve because it has a constant attraction force in the control region independently on the stroke position and a fast motion response of the plunger. The force characteristics with respect to the stroke of the proportional solenoid actuator is strongly depending on the shape of the control cone, but it is difficult to design the control cone. In this paper, a proportional solenoid actuator of electrohydraulic proportional fuel control valve for common rail system was analyzed using finite element method and the shape of the control cone of the proportional solenoid actuator was optimized to get the constant force in the control region. The analysis results of the optimized proportional solenoid actuator were compared with the experimental results of the manufactured one.