초록 ▼

A fuel injection control system for an internal combustion engine utilizes a fuel injection pump in which the pump cylinder is in fluid communication with the fuel injection nozzle and a piezoelectric actuated spill valve. A cam drive actuates the pump piston to achieve a constant velocity during th

A fuel injection control system for an internal combustion engine utilizes a fuel injection pump in which the pump cylinder is in fluid communication with the fuel injection nozzle and a piezoelectric actuated spill valve. A cam drive actuates the pump piston to achieve a constant velocity during the pumping cycle (constant velocity relative to degrees of rotation of the engine crankshaft). An index wheel connected to either the engine crankshaft or the pump camshaft is used in conjunction with an initial position detector, angular position detector and a pump control unit to close and open the spill valve at predetermine positions of the pump piston during the pumping cycle. The pump control unit includes a computer connected to various engine parameter transducers to adjust the closing and opening of the spill valve to achieve a desired fuel injection volume.

대표청구항 ▼

A fuel injection control system comprising an internal combustion engine having a crankshaft, a fuel supply, a spill valve in fluid communication with said fuel supply, a fuel injection nozzle, a fuel pump comprising a piston and cylinder, said cylinder in fluid communication with said fuel injectio

A fuel injection control system comprising an internal combustion engine having a crankshaft, a fuel supply, a spill valve in fluid communication with said fuel supply, a fuel injection nozzle, a fuel pump comprising a piston and cylinder, said cylinder in fluid communication with said fuel injection nozzle and said spill valve, means for actuating said fuel pump piston comprises means for actuating said fuel pump piston to achieve a constant velocity relative to angular rotation of said crankshaft for said piston during the delivery portion of the pumpstroke during the travel of the piston in said cylinder, means for closing said spill valve when said piston, during the delivery portion of the pumpstroke, reaches a first predetermined position in said fuel pump cylinder and opening said spill valve when said piston, during the delivery portion, reaches a second predetermined position in said fuel pump cylinder.