Cylinder-by-cylinder intake air quantity detecting apparatus...

Details Cylinder-by-cylinder intake air quantity detecting apparatus... Cylinder-by-cylinder intake air quantity detecting apparatus...

2005-02-01

2005-02-01

Argenbright, Tony M. (Department: 3747)

Measuring and testing

Simulating operating condition

Marine

C123S435000, C123S494000

Reexamination Certificate

active

06848301

ABSTRACT:
A rate of cylinder-to-cylinder variations in an intake air quantity is calculated, and learned as a learning value based on an output from an airflow meter when a predetermined condition is met. The predetermined condition is set at a preferable condition for learning the rate of cylinder-to-cylinder variations. Subsequently, the rate of cylinder-to-cylinder variations is estimated based on the learning value when the predetermined condition is not met. Thus, cylinder-to-cylinder variations of an engine are accurately obtained in almost all the operating ranges, so that the measurement of the cylinder-by-cylinder intake air quantity with high degree of accuracy is achieved.

REFERENCES:
patent: 4999781 (1991-03-01), Holl et al.
patent: 5398544 (1995-03-01), Lipinski et al.
patent: 6728627 (2004-04-01), Machida
patent: 62-017342 (1987-01-01), None
patent: 2000-220489 (2000-08-01), None

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