Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2006-01-10
2006-01-10
Nguyen, Tu M. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S274000, C060S277000, C060S290000
Reexamination Certificate
active
06983590
ABSTRACT:
A diagnostic system according to the present invention diagnoses system failure of a secondary air injection system. The secondary air injection system includes a pump that provides air to an exhaust system via a conduit and a valve that controls the flow of air through the conduit. A pressure sensor measures pressure in the conduit. A controller predicts pressure in the conduit during first, second and third operational phases of the secondary air injection system. The controller compares the measured pressure to the predicted pressure to evaluate operation of the secondary air injection system. During the first phase, the secondary air injection system is used to reduce vehicle emissions. During the second phase, the valve is shut while the pump is on. During the third phase, the pump is turned off while the valve is closed.
REFERENCES:
patent: 3894984 (1975-07-01), Toda et al.
patent: 5706653 (1998-01-01), Shoji et al.
patent: 5743085 (1998-04-01), Takaku et al.
patent: 5782086 (1998-07-01), Kato et al.
patent: 5814283 (1998-09-01), Matuoka et al.
patent: 5852929 (1998-12-01), Kato et al.
patent: 2003/0061805 (2003-04-01), Hirooka et al.
Hall Martin L.
Hooker Daniel H.
Johnston Gary E.
Person Kevin E.
Polidan Jeffrey M.
DeVries Christopher
General Motors Corporation
Nguyen Tu M.
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