Air filter diagnostic

Details Air filter diagnostic Air filter diagnostic

1995-08-30

1997-02-25

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

55274, G08B 2100

Patent

active

056063113

ABSTRACT:
Significant restriction in an automotive internal combustion engine intake air filter is diagnosed over a wide range of engine operating conditions including low intake airflow rate conditions by qualifying transduced pressure drop across the air filter using airflow rate through the filter. A diagnostic count is maintained and updated in accord with detected significant restriction conditions. Adjustment values applied to the diagnostic count vary in accord with the degree of confidence associated with each detected significant restriction condition, such as indicated by varying engine intake airflow conditions.

REFERENCES:
patent: 3397395 (1968-08-01), Pierce
patent: 5425234 (1995-06-01), Ohuchi et al.

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