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US 4,727,845 AGranted
Air-fuel ratio control apparatus for engines
AssigneeMazda Motor Corporation
InventorsMasanori Misumi, Masashi Marubara, Makoto Hotate, Hiroyuki Oda
Life of this patent
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Abstract
The air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine is determined on the basis of a smoothed amount of intake air and a smoothed throttle opening. The smoothed amount of intake air is reflected by a predetermined ratio of a former amount of intake air to the newest amount of intake air. The smoothed throttle opening is reflected by a ratio of a former throttle opening to the newest throttle opening substantially identical to said predetermined ratio.
Claims12
An air-fuel ratio control apparatus for an engine comprising:
- intake air amount detecting means for detecting an amount of intake air supplied to the engine and providing a signal corresponding to said amount of intake air;
- intake air amount memorizing means for memorizing the amount of intake air detected by said intake air amount detecting means;
- throttle opening detecting means for detecting an opening degree of a throttle valve mounted in an intake passage of the engine and providing a signal corresponding to the throttle opening;
- throttle opening memorizing means for memorizing the throttle opening detected by said throttle opening detecting means;
- intake air amount determining means for determining a smoothed amount of intake air so as to reflect a predetermined ratio of a former amount of intake air memorized in said intake air amount memorizing means to a current amount of intake air corresponding to an output from said intake air detecting means;
- throttle opening determining means for determining a smoothed throttle opening so as to reflect a ratio of a former throttle opening memorized in said throttle opening memorizing means to a current throttle opening at said predetermined ratio;
- air-fuel ratio determining means for the air-fuel ratio of an air-fuel mixture supplied to the engine on the basis of the respective outputs from said intake air amount determining means and said throttle opening determining means;
- and
- air-fuel ratio adjusting means for adjusting an air-fuel ratio of the air-fuel mixture supplied to the engine so as to become the air-fuel ratio determined by said air-fuel ratio determining means.
6 more elements
An air-fuel ratio control apparatus comprising:
- intake air amount detecting means for detecting an amount of intake air of the engine and providing a signal corresponding to the amount of intake air;
- intake air amount memorizing means for memorizing the amount of intake air detected by said intake air amount detecting means;
- throttle opening detecting means for detecting an opening degree of a throttle valve mounted in an intake passage and providing a signal corresponding to the opening degree of the throttle valve;
- throttle opening memorizing means for memorizing the throttle opening detected by said throttle opening detecting means;
- intake air amount determining means for determining a smoothed amount of intake air so as to reflect a predetermined ratio of a former amount of intake air memorized in said intake air amount memorizing means to accurent amount of intake air corresponding to an output from said intake air detecting means;
- throttle opening determining means for determining a smoothed throttle opening so as to reflect a ratio of a former throttle opening memorized in said throttle opening memorizing means to a current throttle opening at said predetermined ratio;
- a fuel injection valve mounted in said intake passage;
- basic injection amount determining means for determining a basic fuel injection amount in the basis of an output from said intake air amount detecting means;
- air-fuel ratio determining means for determining the air-fuel ratio of a air-fuel mixture supplied to the engine on the basis of the respective outputs from said intake air amount determining means and said throttle opening determining means;
- and
- final injection amount determining means for determining a final fuel injection amount by correcting the basic fuel injection amount on the basis of the air-fuel ratio determined by said air-fuel ratio determining means in response to the respective outputs from said basic injection amount determining means and said air-fuel ratio determining means.
8 more elements
Dependencies are inferred from the claim text.