Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...
Reexamination Certificate
2001-10-16
2004-01-06
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
Including means responsive to instantaneous change in engine...
C123S681000, C123S682000, C123S491000, C701S103000, C701S104000, C701S110000
Reexamination Certificate
active
06672284
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2000-317812 filed on Oct. 18, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus to control an amount of fuel supply to an internal combustion engine.
2. Description of Related Art
Conventionally, a technique to determine the properties of fuel based on variations in rotation speed Ne upon or immediately after startup of internal combustion engine is known.
However, there is no technique to estimate an air-fuel ratio (hereinafter referred to “A/F”) from the variation amount of the rotation speed Ne instead of the determination of fuel properties.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an internal combustion engine fuel supply amount control apparatus to estimate an A/F based on the rotation speed Ne of the engine and accurately control the air-fuel ratio immediately after startup of the engine based on the estimated A/F.
According to the present invention in the internal combustion engine fuel supply amount control apparatus in claim
1
, an air-fuel ratio of an internal combustion engine during a predetermined period is estimated based on a load on the internal combustion engine detected by load detection means. In this constitution, as the air-fuel ratio can be estimated in correspondence with the load on the internal combustion engine, control based on the air-fuel ratio can be performed even before an A/F sensor is activated. Especially, optimum combustion can be performed from the startup of the internal combustion engine. Note that the “load” here may be a general load such as an intake air amount, an intake pipe pressure and an intake air flow speed, but may more preferably be a rotation speed of the internal combustion engine.
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Denso Corporation
Huynh Hai
Nixon & Vanderhye PC
Yuen Henry C.
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