Positive crankcase ventilation system diagnostic

Details Positive crankcase ventilation system diagnostic Positive crankcase ventilation system diagnostic

1996-10-28

1999-04-27

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

731173, 123679, G01M 1500

Patent

active

058975977

ABSTRACT:
A diagnostic for diagnosing fault conditions including leak and restriction conditions in a positive crankcase ventilation (PCV) system of an internal combustion engine in which temperature of intake air passed to the PCV system and temperature of exhaust gas exhausted from the PCV system are monitored under test conditions and a temperature change across the PCV system generated therefrom for comparison to an expected temperature change reference as a function of current engine operating conditions. A significant persistent deviation of the temperature change away from the expected temperature change is indicated as a fault condition of the PCV system.

REFERENCES:
patent: 3630076 (1971-12-01), Staudt
patent: 3864964 (1975-02-01), Voelz
patent: 3992878 (1976-11-01), Moorman
patent: 5331940 (1994-07-01), Takayama
patent: 5722376 (1998-03-01), Sweeten
patent: 5792949 (1998-08-01), Hewelt et al.
U. S. application No. 08/705,895, Hewelt et al., filed Aug. 28 1996.

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