Air filter restriction monitoring without pre-throttle...

Details Air filter restriction monitoring without pre-throttle... Air filter restriction monitoring without pre-throttle...

2007-01-24

2008-10-28

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Monitoring intake air system

Reexamination Certificate

active

07441449

ABSTRACT:
A method of monitoring air flow restriction in an air intake of an internal combustion engine includes recording a predetermined number of pre-throttle pressure samples, recording a predetermined number of mass air flow samples, which respectively correspond to the pre-throttle pressure samples and determining a slope based on the pre-throttle pressure samples and the mass air flow samples. Whether an air filter is inducing an air flow over restriction is determined based on the slope.

REFERENCES:
patent: 5604306 (1997-02-01), Schricker
patent: 7032573 (2006-04-01), Ardisana
patent: 7178410 (2007-02-01), Fraden et al.
patent: 7305301 (2007-12-01), Wang et al.
patent: 2005/0240338 (2005-10-01), Ardisana
U.S. Appl. No. 11/464,340, filed Aug. 14, 2006.

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