Intake manifold tuning valve fuzzy logic diagnostic

Details Intake manifold tuning valve fuzzy logic diagnostic Intake manifold tuning valve fuzzy logic diagnostic

2006-08-24

2010-10-05

McCall, Eric S. (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Monitoring intake air system

C073S114370

Reexamination Certificate

active

07805984

ABSTRACT:
A method of diagnosing a malfunction of a tuning valve of an intake manifold coupled to an internal combustion engine is provided. The method includes: commanding the tuning valve to at least one of a closed and an opened position; computing an average deviation of manifold absolute pressure; determining an average deviation threshold using fuzzy logic based on engine speed and airflow per cylinder; comparing the average deviation to the average deviation threshold; and diagnosing a malfunction of the tuning valve based on a comparison of the average deviation and the average deviation threshold.

REFERENCES:
patent: 7270116 (2007-09-01), Pauli et al.
patent: 2005/0161013 (2005-07-01), Marriott
patent: 2007/0221148 (2007-09-01), Marriott
patent: 2007/0244626 (2007-10-01), Lain et al.

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