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US 2015/0083081 A1Published application
Method and system for an intake humidity sensor
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Timothy Joseph Clark, Evangelos Skoures, Richard E. Soltis
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Abstract
Methods and systems are provided for adjusting an engine operating parameter based on an output of a humidity sensor during a compressor bypass valve event. When the compressor bypass valve is closed, a current output of the sensor is used for the adjustments. When the compressor bypass valve is opened, such as to mitigate surge, an output of the sensor stored from before the opening of the bypass valve is used for the adjustments.
Claims20
A method for an engine, comprising:
- in response to opening of a compressor bypass valve while EGR is enabled,
- adjusting an engine operating parameter based on an output of an intake humidity sensor read before the opening of the bypass valve.
A method for an engine, comprising:
- during a first boosted engine operation, closing a compressor bypass valve while EGR is enabled, and adjusting an engine operating parameter based on a current output of an intake humidity sensor;
- and
- during a second boosted engine operation, opening the compressor bypass valve while EGR is enabled, and adjusting an engine operating parameter based on an output of the humidity sensor read before the opening of the bypass valve.
An engine system, comprising:
- an engine;
- a compressor coupled to an intake manifold of the engine, the compressor driven by a turbine;
- a bypass passage coupled between an outlet and an inlet of the compressor, the bypass including a bypass valve;
- a humidity sensor coupled to the intake manifold, upstream of an intake throttle;
- a low pressure EGR passage for recirculating exhaust residuals from an exhaust manifold of the engine, downstream of the turbine, to the intake manifold, upstream of the compressor, via an EGR valve;
- and
- a controller with computer readable instructions for:
- while EGR is enabled, in response to an indication of compressor surge,
- opening the bypass valve;
- storing an output of the humidity sensor read immediately before the opening of the bypass valve;
- and
- adjusting EGR flow based on the stored sensor output.
9 more elements
Dependencies are inferred from the claim text.