Device for estimating an amount of intake air of an internal...

Details Device for estimating an amount of intake air of an internal... Device for estimating an amount of intake air of an internal...

2005-03-15

2005-03-15

Wolfe, Willis R. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C701S104000, C701S108000, C701S114000, C073S117020, C073S117020, C073S118040, C073S118040, C123S677000, C123S683000, C123S684000, C123S382000, C123S389000, C123S390000, C123S391000

Reexamination Certificate

active

06868327

ABSTRACT:
A device for estimating the amount of intake air of an internal combustion engine comprising intake pipe pressure calculation means for calculating an intake pipe pressure, at this time, downstream of the throttle valve, and intake air amount calculation means for calculating the amount of intake air, at this time, based on the intake pipe pressure at this time calculated by said intake pipe pressure calculation means, is provided. The intake pipe pressure calculation means calculates the intake pipe pressure at this time by using the intake pipe pressure calculated at the last time and the amount of air passing through the throttle valve at the last time calculated by means for calculating the amount of air passing through the throttle valve. The device for estimating the amount of intake air further comprises limitation means for replacing the intake pipe pressure at this time by the atmospheric pressure when the intake pipe pressure at this time calculated by the intake pipe pressure calculation means is higher than the atmospheric pressure, and correction means for correcting the amount of air passing through the throttle valve at the last time based on the pressure differential between the atmospheric pressure and the intake pipe pressure calculated at the last time when the intake pipe pressure at this time is replaced, by the atmospheric pressure, by the limitation means.

REFERENCES:
patent: 6298299 (2001-10-01), Itoyama et al.
patent: 6615647 (2003-09-01), Niki
patent: 6662640 (2003-12-01), Yagi
patent: A 2001-41095 (2001-02-01), None
patent: A 2002-201998 (2002-07-01), None

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