Internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorRyota Yamada
Life of this patent
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Abstract
In a combustion cycle in which fuel for forming a homogenized air-fuel mixture in the combustion chamber is injected from the first fuel injector, ignition-use fuel for forming an ignition-use air-fuel mixture in the vicinity of the electrode part is injected from the second fuel injector, and lean combustion is performed by an excess air rate of 2.0 or more, the ignition-use fuel is injected by at least an injection rate of 1.0 mm3/ms or more for a duration of 250 μs or more in an interval from a crank angle advanced by exactly 20 degrees from an ignition timing of the spark plug to the ignition timing, and the quantity of the ignition-use fuel is 2.0 mm3/st or less.
Claims4
An internal combustion engine comprising:
- an engine body,
- a spark plug in which an electrode part is placed so as to approach a combustion chamber of the engine body,
- a first fuel injector injecting fuel into an intake passage or combustion chamber of the engine body,
- a second fuel injector injecting fuel into the combustion chamber, and
- an electronic controller configured to control the first fuel injector and the second fuel injector such that:
- in a combustion cycle in which fuel for forming a homogenized air-fuel mixture in the combustion chamber is injected from the first fuel injector, ignition-use fuel for forming an ignition-use air-fuel mixture in the vicinity of the electrode part is injected from the second fuel injector, and lean combustion is performed by an excess air rate of 2.0 or more,
- the ignition-use fuel is injected by at least an injection rate of 1.0 mm3/ms or more for a duration of 250 μs or more in an interval from a crank angle advanced by exactly 20 degrees from an ignition timing of the spark plug to the ignition timing, and
- the quantity of the ignition-use fuel is 2.0 mm3/st or less.
Dependencies are inferred from the claim text.