Air-fuel ratio controller for internal combustion engine and...

Details Air-fuel ratio controller for internal combustion engine and... Air-fuel ratio controller for internal combustion engine and...

2007-09-25

2007-09-25

Argenbright, T. M. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S118040, C123S494000, C123S684000

Reexamination Certificate

active

11169020

ABSTRACT:
A computer calculates an estimated cylinder-intake-air amount based on outputs from an airflow meter and a throttle position sensor, and then calculates a reference cylinder-intake-air amount based on an air-fuel ratio in an exhaust gas and fuel injection amount. An error of the estimated cylinder-intake-air amount is calculated by comparing the reference cylinder-intake-air amount with an estimated cylinder-intake-air amount base value. The error is low-pass filtered. The estimated cylinder-intake-air amount base value is corrected to obtain the final estimated cylinder-intake-air amount.

REFERENCES:
patent: 5384707 (1995-01-01), Kerns et al.
patent: 5714673 (1998-02-01), Bidner et al.
patent: 6662640 (2003-12-01), Yagi
patent: 2004-100472 (2004-04-01), None
patent: 2004-116459 (2004-04-01), None

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