Blow-by gas passage abnormality detecting system for internal co

Details Blow-by gas passage abnormality detecting system for internal co Blow-by gas passage abnormality detecting system for internal co

1997-12-11

2000-08-08

McMahon, Marguerite

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123198D, F01M 1300

Patent

active

060986034

ABSTRACT:
A blow-by gas passage abnormality detecting system for an internal combustion engine detects, only under the condition that the running state of the engine is idle, a leakage of a blow-by gas coming from a blow-by gas passage for returning the blow-by gas produced in the engine to an intake passage, on the basis of a parameter varying with a change in the air flow to be sucked into the engine. The abnormality such as leakage or clogging in the blow-by gas passage is detected if the ISC opening of an idle speed control valve measured as a load amount at an idle time of the engine is smaller than a predetermined value. Alternatively, the abnormality may be detected by detecting the blow-by gas pressure in the blow-by gas passage downstream of a PCV valve by a gas pressure sensor.

REFERENCES:
patent: 3754538 (1973-08-01), Ephraim, Jr. et al.
patent: 3924588 (1975-12-01), Hager
patent: 3951115 (1976-04-01), Brisko
patent: 4106442 (1978-08-01), Miller

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