Detection of a humidity sensor failure in an internal...

Details Detection of a humidity sensor failure in an internal... Detection of a humidity sensor failure in an internal...

2008-07-09

2010-02-02

Kwon, John T. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S678000, C073S118040

Reexamination Certificate

active

07654253

ABSTRACT:
A method to determine degradation of a humidity sensor used for controlling an engine of a vehicle, the humidity sensor exterior to a passenger compartment of the vehicle, the method comprising determining whether to enable monitoring of the sensor based on a duration since vehicle operation; and in response to a determination to enable monitoring, comparing a signal from a second humidity sensor to a signal from the humidity sensor exterior to said passenger compartment of the vehicle to determine whether either of sensors has degraded.

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