Air bypass valve failure detection device in supercharging...

Details Air bypass valve failure detection device in supercharging... Air bypass valve failure detection device in supercharging...

2007-07-20

2009-08-25

Denion, Thomas E (Department: 3748)

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

C123S561000

Reexamination Certificate

active

07578128

ABSTRACT:
An air bypass valve failure detecting device outputs an opening command to an air bypass valve when a throttle valve suddenly closes, thereby prevent surging from occurring in a second intake passage between a turbocharger and a throttle valve. When the opening command is outputted to the air bypass valve, failure detection for the air bypass valve is permitted only if an intake air quantity of an engine immediately before a closing command is changed to the opening command is equal to or larger than a predetermined value. Thus, it is possible to prevent the failure detecting device from erroneously determining that the air bypass valve is normal although valve closing failure of the air bypass valve has occurred. This is because, when the intake air quantity is smaller than the predetermined value, surging does not occur in the second intake passage even if the valve closing failure of the airy bypass valve has occurred.

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patent: 6990814 (2006-01-01), Boley et al.
patent: 2006/0248889 (2006-11-01), Sagisaka et al.
patent: 7-46737 (1995-10-01), None
patent: 07-046737 (1995-10-01), None
patent: 2006057526 (2006-03-01), None

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