초록 ▼

A system and method for controlling the fuel pressure in a common rail fuel injection system which electronically controls a variable output high pressure pump based upon engine speed, torque and actual common rail pressure inputs, as well as the present system voltage, thereby providing simple yet

A system and method for controlling the fuel pressure in a common rail fuel injection system which electronically controls a variable output high pressure pump based upon engine speed, torque and actual common rail pressure inputs, as well as the present system voltage, thereby providing simple yet stable control of the fuel pressure in the accumulator of the common rail system which is relatively insensitive to supply voltage fluctuations from the power source providing the electrical power to the solenoid-controlled valve which controls the high pressure pump.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.