Fuel injection system and method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomihisa Oda
Life of this patent
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Abstract
A fuel injection system includes a first fuel injector that injects a lower-octane fuel into a combustion chamber of an internal combustion engine, and a second fuel injector that injects a higher-octane fuel into an intake passage of the engine. When the engine temperature is equal to or lower than a predetermined temperature during a start-up period of the internal combustion engine, fuel having the lower octane is injected via the first injector while prohibiting injection of the higher octane fuel via the second fuel injector.
Claims4
A fuel injection system comprising:
- a first fuel injector that injects fuel having a first octane rating into a combustion chamber of an internal combustion engine;
- a second fuel injector that injects fuel having a second octane rating into an intake passage of the internal combustion engine, the second octane rating being higher than the first octane rating;
- and
- a controller that causes only injection of fuel having the second octane rating via the second fuel injector during a start-up period of the internal combustion engine, wherein
- the controller alternatively causes injection of fuel having the first octane rating via the first fuel injector while prohibiting injection of fuel having the second octane rating via the second fuel injector if a temperature of the internal combustion engine is equal to or lower than a predetermined temperature during the start-up period of the internal combustion engine.
A method of controlling fuel injection in an internal combustion engine, comprising:
- detecting a temperature of the internal combustion engine during a start-up period of the internal combustion engine;
- injecting a higher-octane fuel into an intake passage of the internal combustion engine while prohibiting injection of a lower-octane fuel into a combustion chamber of the internal combustion engine during the start-up period of the internal combustion engine if the detected temperature of the internal combustion engine is higher than a predetermined temperature;
- and
- injecting the lower-octane fuel into the combustion chamber of the internal combustion engine while prohibiting injection of the higher-octane fuel into the intake passage of the internal combustion engine if the detected temperature of the internal combustion engine is equal to or lower than the predetermined temperature.
Dependencies are inferred from the claim text.