Patent ID: 6016791
Filing Date: 2000-01-25
Classification: F02D,F02M

Abstract:
In a common rail fuel injection system including a plurality of fuel injectors for injecting fuel at a selected pressure from a common rail into the cylinders of an internal combustion engine, a common rail connected to the injectors for accumulating fuel at the selected pressure, a variable output fuel pump connected to the common rail, the pump including a solenoid-actuated valve for controlling the fuel input to the pump, and an electronic engine control for providing a plurality of inputs corresponding to engine operating conditions, an electronic fuel pressure control comprising:a sensor for sensing the actual rail pressure;a pressure commander including logic for determining a pressure deviation based upon the sensed actual pressure and engine operation conditions;a pump output governor including logic for determining the pump usage percentage as a function of the pressure deviation; anda pump control signal generator including logic for determining a control signal based upon the pump usage percentage, and logic for outputting that signal to power the pump solenoid.