Efficient wave form to control fuel system

摘要

An efficient control wave form is utilized to actuate the solenoids (20) of a fuel system (10) to reduce boost power/energy consumption. The solenoid (20) is initially energized by applying a boost voltage (60) from an electronic controller (30) across a solenoid coil circuit (22). The electronic controller (30) monitors the current level in the solenoid coil circuit (22), and changes to a reduced battery voltage (62) when the current level in the solenoid coil circuit (22) reaches a predetermined trigger current (65). The controller then maintains a pull-in current based upon battery voltage (62) for a pull-in duration (71) that initiates movement of the solenoid (20) armature from an initial air gap (23) position toward a final air gap (24) position. After the pull-in duration (71), the current level is dropped to a hold in level for the remaining duration of the actuation event. The solenoid (20) may be used for fuel injector control and/or pump control, such as to control fuel injection and pumping events respectively.