Fuel supply system
AssigneeHitachi, Ltd.
InventorsKenji Hiraku, Kenichiro Tokuo, Tadahiko Nogami, Kunihiko Takao, Hiroyuki Yamada
Life of this patent
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Abstract
The present invention reduces the unevenness of injection rates of cylinders in a fuel supply system of a direct injection engine which uses a variable-displacement single plunger pump. The unevenness of injection rates of cylinders can be reduced by constructing so that the cam 100 which drives the high-pressure fuel pump 101 may make one reciprocation while the engine makes explosions by two cylinders and causing the controller 55 to extend the injection time width of one of two injectors 54 which inject while one discharge of the high-pressure fuel pump and to shorten the injection time width of the other injector.
Claims5
A fuel supply system for a direct injection engine comprising a fuel pump which supplies fuel to injection valves by varying the volume by the reciprocal movement of a single-cylinder plunger, a driving mechanism which makes one reciprocal movement of said plunger while said injection valves inject fuel as much as two cylinders, and a controller which controls said fuel pump to adjust the fuel supply pressure, the injection start timing, and the injection time width of said fuel injection valve, wherein said controller works to make the injection time width of one of said two fuel injection valves longer and that of the other fuel injection valve shorter.
Dependencies are inferred from the claim text.