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DETECTION OF A HUMIDITY SENSOR FAILURE IN AN INTERNAL COMBUSTION ENGINE

  • US 20080270012A1
  • Filed: 07/09/2008
  • Published: 10/30/2008
  • Est. Priority Date: 10/02/2003
  • Status: Active Grant
First Claim
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1. 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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