Crankcase integrity breach detection
First Claim
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1. A method for an engine, comprising:
- indicating a crankcase ventilation system degradation based on a lower vacuum than expected downstream of a PCV breather tube.
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Abstract
Systems and methods for monitoring crankcase ventilation system integrity are disclosed. In one example approach, a method comprises indicating a crankcase ventilation system degradation based on a lower vacuum than expected downstream of a PCV breather tube. For example, indicating a crankcase ventilation system degradation based on a lower vacuum than expected downstream of a PCV breather tube may include indicating a crankcase ventilation system degradation based on an absolute pressure sensor measurement relative to a gauge pressure sensor measurement.
28 Citations
20 Claims
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1. A method for an engine, comprising:
indicating a crankcase ventilation system degradation based on a lower vacuum than expected downstream of a PCV breather tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for an engine, comprising:
indicating a crankcase ventilation system degradation based on relative pressure sensor readings of only two of a barometric pressure sensor, compressor inlet pressure sensor, and a pressure sensor disposed in a PCV breather tube. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for an engine with a positive crankcase ventilation system, comprising:
during a high air speed engine operating condition, indicating a crankcase ventilation system degradation based on a barometric pressure substantially equal to a compressor inlet pressure. - View Dependent Claims (19, 20)
Specification