Engine control device and control method thereof
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHarumi Furukawa, Yoshitsugu Kosugi
Life of this patent
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Abstract
An engine control device and method that prevents fuel injection quantity from becoming unstable due to a rapid change of a correction quantity even in a predetermined operation state such as acceleration time and thus stabilizes an air-fuel ratio. Under a predetermined operating state, even when feedback control of oxygen in exhaust gas is stopped, a correction quantity immediately before the predetermined operating state is held by a correction quantity storage part and the correction of the fuel injection time is performed based on the correction quantity.
Claims5
An engine control device comprising:
- an oxygen density detection means for detecting an oxygen density in an exhaust gas exhausted from an engine;
- a fuel injection time calculation means for calculating fuel injection time that sequentially decides a correction quantity for correcting a fuel injection time for injecting fuel to the engine so as to approximate an air-fuel ratio of the engine to a predetermined value based on the oxygen density detected by the oxygen density detection means for detecting, and calculates the fuel injection time for injecting the fuel to the engine based on the correction quantity;
- and
- a correction quantity storage means for storing the correction quantity sequentially decided by the fuel injection time calculation means for calculating, wherein
- the fuel injection time calculation means for calculating calculates the fuel injection time based on the correction quantity that is sequentially decided and is already stored by the correction quantity storing means for storing when the engine assumes a predetermined operation state.
An engine control method comprising:
- detecting an oxygen density in an exhaust gas exhausted from an engine;
- sequentially deciding a correction quantity for correcting a fuel injection time for injecting a fuel to an engine so as to approximate an air-fuel ratio of the engine to a predetermined value based on the oxygen density and calculating the fuel injection time for injecting the fuel to the engine based on the correction quantity;
- and
- storing the sequentially-decided correction quantity in a storing means for storing, wherein
- the fuel injection time is calculated based on the correction quantity that is sequentially determined and is already stored by the storing means for storing when the engine assumes a predetermined operation state.
Dependencies are inferred from the claim text.