Valve operation verification system for verifying valve operatio

Details Valve operation verification system for verifying valve operatio Valve operation verification system for verifying valve operatio

1997-11-28

2000-03-14

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

731173, 701108, F02M 2507

Patent

active

060358351

ABSTRACT:
A valve operation verifying system for making verification of valve operation of an EGR valve of a type having a diaphragm elastically deformable according to operating conditions of an engine to admit controlled amounts of exhaust gas that is recirculated into an intake air stream which verifies, on a basis of gas pressure in an EGR passage, whether the diaphragm remains elastically deformable as specified and whether a pressure sensor remains free from freezing, and executes the verification of valve operation of the EGR valve on a basis of a change in the gas pressure in the EGR passage when the EGR valve opens and when it closes, and when the temperature of ambient air is lower than a critical point, verifying that the diaphragm remains elastically deformable as specified and that said pressure sensor is free from freezing.

REFERENCES:
patent: 4690120 (1987-09-01), Egle
patent: 5014203 (1991-05-01), Miyazaki et al.
patent: 5349936 (1994-09-01), Uchinami
patent: 5474051 (1995-12-01), Matsumoto et al.
patent: 5727533 (1998-03-01), Bidner et al.
patent: 5771869 (1998-06-01), Yoshihara et al.

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