Direct injection gasoline engine
AssigneeHitachi, Ltd.
InventorsYoko Nakayama, Toshiharu Nogi, Takuya Shiraishi, Yusuke Kihara, Tohru Ishikawa
Life of this patent
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Abstract
In a center injection type of direct injection engine, since it has an ignition plug and an injector arranged in proximity, there occurs the problem that a sprayed liquid fuel directly strikes the ignition plug and causes the plug to misfire. A notch is to be provided at a portion of the injector end so as to form a coarse-grained portion and a dense portion in sprays of fuel, and the injector is disposed so that the coarse-grained portion is directed towards the ignition plug. It is possible to avoid the misfiring of the ignition plug and thus prolong the life of the plug, by preventing a liquid fuel from directly striking the plug.
Claims33
A direct injection gasoline engine for directly injecting a fuel into a cylinder from a fuel injector;
- said direct injection gasoline engine having said fuel injector mounted in the neighborhood of an ignition plug, and being installed in such a manner that the fuel injector is constructed so as to achieve a nonuniform fuel distribution in a circumferential direction with respect to a spraying axis of the fuel injector and that a coarse portion of the distribution corresponds to said ignition plug.
A fuel injector to be used for a direct injection gasoline engine which injects a fuel directly into a cylinder from a fuel injector mounted in the neighborhood of an ignition plug;
- said fuel injector being constructed so as to achieve a nonuniform fuel distribution in a circumferential direction with respect to a spraying axis of the fuel injector, and being equipped with a means for positioning the fuel injector so that when the engine is mounted, a coarse-grained portion of the fuel sprayed will correspond to said ignition plug.
A direct injection gasoline engine comprising
- a combustion chamber formed between a cylinder head and a piston, an ignition plug, and an injector provided near the upper center of said combustion chamber and injecting gasoline directly into the combustion chamber,
- wherein said direct injection gasoline engine is characterized in that an injector for creating coarse-grained and dense sprays of fuel is combined, with the coarse-grained spray being directed towards the ignition plug.
A direct injection gasoline engine comprising
- a combustion chamber formed between a cylinder head and a piston, an ignition plug for firing an air-fuel mixture, and an injector provided near the upper center of said combustion chamber and injecting gasoline directly into the combustion chamber,
- wherein said direct injection gasoline engine is characterized in that it is constructed in order for a dense spray of gasoline to be directed towards said ignition plug and for the following coarse-grained spray to enclose the ignition plug.
Dependencies are inferred from the claim text.