Abstract: A control circuit is provided for a field-effect transistor with a floating source node. The control circuit includes: a charge storage device electrically connected between a gate of the field-effect transistor and a DC power supply; a gate control circuit electrically connected between the charge storage device and the gate of the field-effect transistor; and a charge control circuit electrically connected between the DC power supply and the charge storage device. The gate control circuit is configured to receive a gate control signal and operates to turn on the field-effect transistor during on time of the gate control signal and turn off the field-effect transistor during off time of the gate control signal. The charge control circuit is also configured to receive the gate control signal and operates to charge the charge storage device with power from the DC power supply during off time of the gate control signal.

Abstract: A method of controlling a fuel injector valve solenoid includes generating a set-point signal which models a desired current profile flowing through the valve solenoid, providing a current controller which is adapted to regulate the current flowing through the valve solenoid, and regulating the current flowing through the valve solenoid such that the current flowing through the valve solenoid closely matches the set point signal. Regulating the current includes measuring the current flowing through the valve solenoid, comparing the current flowing through the valve solenoid to the current profile of the set-point signal, and adjusting the current flowing through the valve solenoid to more closely match the current profile of the set-point signal.

Abstract: A method of controlling a fuel injector valve solenoid includes generating a set-point signal which models a desired current profile flowing through the valve solenoid, providing a current controller which is adapted to regulate the current flowing through the valve solenoid, and regulating the current flowing through the valve solenoid such that the current flowing through the valve solenoid closely matches the set point signal. Regulating the current includes measuring the current flowing through the valve solenoid, comparing the current flowing through the valve solenoid to the current profile of the set-point signal, and adjusting the current flowing through the valve solenoid to more closely match the current profile of the set-point signal.

Abstract: A method of controlling the fuel pressure within a fuel delivery system having a fuel pump that delivers fuel to a fuel rail of an internal combustion engine includes providing a set-point fuel pressure, generating a feed forward signal having a set of fuel pump motor control parameters based upon the set-point fuel pressure and the desired fuel flow rate, providing a pressure sensor to measure the fuel rail pressure, comparing the fuel rail pressure to the set-point fuel pressure and generating an error value based upon the difference between the fuel rail pressure and the set-point fuel pressure, providing a feed back controller adapted to receive the error value and to generate a feed back control signal, combining the feedback control signal and the feed forward control signal to generate a motor controller signal.