System for a virtual dew point sensor

Details System for a virtual dew point sensor System for a virtual dew point sensor

2007-11-06

2007-11-06

Kwon, John T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S568210

Reexamination Certificate

active

11393955

ABSTRACT:
A system for a virtual dew point sensor is disclosed including a method for operating the virtual dew point sensor. The method includes determining a first humidity ratio indicative of the humidity associated with an ambient air as a function of at least a relative humidity associated with the ambient air. The method also includes determining a second humidity ratio indicative of the humidity associated with an exhaust gas as a function of at least one engine parameter. The method also includes determining a third humidity ratio indicative of combustion air directed toward an inlet manifold of an engine as a function of the first and second humidity ratios. The method further includes determining at least one dew point indicative of the combustion air as a function of the third humidity ratio and a pressure indicative of the combustion air.

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