Detection of a humidity sensor failure in an internal combustion engine
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 vehicle operating conditions;
in response to a determination to enable monitoring,comparing a signal from a humidity sensor interior to a passenger compartment of the vehicle to a signal from the humidity sensor exterior to said passenger compartment of the vehicle to determine whether either of said interior or exterior sensor has degraded.
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Abstract
A system and method for utilizing a humidity sensor with an internal combustion engine of a vehicle is described. Specifically, information from the humidity sensor is used to adjust a desired air-fuel ratio to reduce engine misfire while improving vehicle fuel economy. Further, such information is also used to adjust timing and/or lift of the valve in the engine cylinder. Finally, diagnostic routines are also described.
31 Citations
9 Claims
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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:
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determining whether to enable monitoring of the sensor based on vehicle operating conditions; in response to a determination to enable monitoring, comparing a signal from a humidity sensor interior to a passenger compartment of the vehicle to a signal from the humidity sensor exterior to said passenger compartment of the vehicle to determine whether either of said interior or exterior sensor has degraded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification