CRANKCASE VENTILATION TUBE DISCONNECT DETECTION VIA HUMIDITY SENSOR
First Claim
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1. An engine method, comprising:
- indicating crankcase ventilation tube degradation based on humidity.
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Abstract
Methods and systems are provided for detecting degradation of a crankcase ventilation tube. Humidity sensed from a humidity sensor in the crankcase ventilation tube may provide an indication of crankcase ventilation tube disconnection during different engine operating conditions. The humidity sensor may further provide diagnosis of humidity sensor function and engine degradation.
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Citations
20 Claims
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1. An engine method, comprising:
indicating crankcase ventilation tube degradation based on humidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An engine method, comprising:
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adjusting engine operating parameters based on humidity, the humidity sensed in a crankcase ventilation tube; and indicating degradation of the crankcase ventilation tube based on the sensed humidity and an engine boosting level. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system for an engine comprising:
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a positive crankcase ventilation system, the positive crankcase ventilation system including a crankcase ventilation tube, the crankcase ventilation tube connected at a first end to a fresh air intake and at a second end to a crankcase; a humidity sensor, the humidity sensor located inside the crankcase ventilation tube; a manifold absolute pressure sensor; and a controller with computer readable instructions for adjusting engine operating parameters based on humidity sensed by the humidity sensor and indicating degradation of the crankcase ventilation tube based on humidity sensed by the humidity sensor and engine boosting.
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Specification