Patent ID: 6694952
Filing Date: 2004-02-24
Classification: F02M,F04B

Abstract:
A high pressure fuel injection apparatus for an internal combustion engine having engine cylinders and comprising an injector for each engine cylinder, a pressure accumulator connected to each injector to distribute fuel to the injectors and consisting of a single high-pressure fuel pump connected to the pressure accumulator for pumping high pressure fuel from a fuel tank to the pressure accumulator, the fuel pump comprising:a plunger disposed in a cylinder, the cylinder defining a pressurizing chamber having a capacity that increases during a suction stroke of the plunger and decreases during an ejection stroke of the plunger; a spill valve that spills fuel from the pressurizing chamber by being opened during the ejection stroke, ejects fuel from the pressurizing chamber by being closed during the ejection stroke, and regulates an amount of fuel ejected from the pressurizing chamber by electronically controlling a closing time of the spill valve; and a plunger driver that drives the plunger through the suction and ejection strokes at an acceleration that is less for the ejection stroke than for the suction stroke, wherein the plunger driver drives the single plunger.