EGR detection via humidity detection
AssigneeFord Global Technologies, LLC
InventorsNian Xiao, James Michael Kerns, Yi Ding
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Abstract
Various systems and methods are described for controlling an engine in a vehicle which includes an exhaust passage and an exhaust gas recirculation system. One example method comprises adjusting an engine operating parameter based on an exhaust gas recirculation amount, the exhaust gas recirculation amount based on a first humidity and a second humidity, the first humidity generated from a first humidity sensor at a first location and the second humidity generated from a second humidity sensor located in the exhaust passage of the engine.
Claims20
A method for controlling an engine in a vehicle during engine operation, the engine having an exhaust passage and an exhaust gas recirculation system, the method comprising:
- adjusting an engine operating parameter based on an exhaust gas recirculation amount, the exhaust gas recirculation amount based on a first humidity and a second humidity, the first humidity generated from a first humidity sensor at a first location in an intake manifold of the engine, the second humidity generated from a second humidity sensor at a second location in an exhaust manifold of the engine.
A method of controlling an engine in a vehicle during engine operation, the engine having an exhaust gas recirculation system and an exhaust system, the method comprising:
- during engine non-fueling conditions, generating an intake humidity via a first sensor and an exhaust humidity via a second sensor, the second sensor positioned in an exhaust gas flow of the engine, the exhaust gas flow directed to a tailpipe of the exhaust system;
- during engine fueling conditions in which exhaust gas recirculation is off, generating an intake humidity via the first sensor;
- and
- identifying degradation based on the generated humidities.
A system for an engine in a vehicle, the system comprising:
- an exhaust gas recirculation system;
- at least two humidity sensors coupled to the engine, a first sensor being located in an intake manifold and a second sensor being located in an exhaust manifold upstream of the exhaust gas recirculation system;
- and
- a control system including a computer readable storage medium, the medium including instructions thereon, the control system receiving communication from the humidity sensors, the medium comprising:
- instructions for identifying an amount of exhaust gas recirculation, where the identified exhaust gas recirculation amount is based on humidity readings generated by the at least two humidity sensors, as well as an ambient humidity, and instructions for adjusting an engine operating condition in response to the identified exhaust gas recirculation amount.
Dependencies are inferred from the claim text.