Control apparatus of internal combustion engine
AssigneeDenso Corporation
InventorYoshihiro Majima
Life of this patent
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Abstract
The ignition timing is sustained at an initial value during a predetermined time beginning at a start of an engine, and is retarded after the predetermined time is elapsed to heat a catalyst at an early time. The predetermined time ends when the negative pressure of an intake pipe or the negative pressure of a brake booster reaches to a predetermined value. That is, the predetermined time is a period, which begins at a start of the engine and ends when a proper negative pressure can be sustained in the brake booster. As a result, it is possible to assure a negative pressure in the brake booster at an early time and to reduce exhaust emission at a start of the engine simultaneously.
Claims11
A valve timing control apparatus of an internal combustion engine comprising:
- a variable intake valve timing mechanism for varying an intake valve's position relative to a crank shaft of the internal combustion engine and used for controlling a closing position of the intake valve on the basis a result of processing carried out on the closing position of the intake valve in accordance with an operating condition of the internal combustion engine;
- a first advancing controller, which is used for advancing the closing position of the intake valve on the basis of operating status of a brake when the closing position of the intake valve is retarded behind a bottom dead center;
- and
- a combustion state detector for detecting a combustion state of the internal combustion engine,
- wherein the first advancing controller advances a closing position of the intake valve on the basis of status of the brake when a combustion state detected by the combustion state detector is stable.
Dependencies are inferred from the claim text.