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US 2014/0156172 A1Published application
Exhaust humidity sensor
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Richard E. Soltis, Jacobus Hendrik Visser, Stephen B. Smith, Timothy Clark
Life of this patent
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Abstract
Embodiments for adjusting engine operating parameters based on output from an exhaust humidity sensor are provided. One example method for an engine comprises based on a dew point of exhaust gas, adjusting an exhaust gas sensor heater configured to heat an exhaust gas sensor disposed in an exhaust passage of the engine, the dew point based on output from a humidity sensor disposed in the exhaust passage.
Claims20
A method for an engine, comprising:
- based on a dew point of exhaust gas, adjusting an exhaust gas sensor heater configured to heat an exhaust gas sensor disposed in an exhaust passage of the engine, the dew point based on output from a humidity sensor disposed in the exhaust passage.
A method for an engine, comprising:
- determining a light-off temperature of a catalyst disposed in an exhaust passage of the engine based on exhaust gas water content measured by a humidity sensor disposed in the exhaust passage downstream of the catalyst;
- and
- during cold start conditions, adjusting engine operating parameters to increase exhaust gas temperature above the light-off temperature.
A method for an engine having a catalyst, comprising:
- adjusting a measured exhaust gas water content based on water storage and release in the catalyst;
- and
- adjusting a fuel injection amount based on the adjusted exhaust gas water content.
Dependencies are inferred from the claim text.