Crankcase ventilation system and diagnostic method
AssigneeFord Global Technologies, LLC
InventorsRobert Roy Jentz, Matthew Carpenter, Michael Stephen Sweppy
Life of this patent
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Abstract
Methods and systems are provided for diagnosing a positive crankcase ventilation (PCV) system. In one example, a PCV system diagnostic method is provided that includes a determining a fault condition in a positive crankcase ventilation (PCV) system by comparing a pressure sampled from a pressure sensor positioned on a clean side of an oil separator coupled to a crankcase with a modeled pressure representing an expected pressure on the clean side of the oil separator.
Claims20
A method comprising:
- determining a fault condition in a positive crankcase ventilation (PCV) system by comparing a pressure sampled from a pressure sensor positioned on a clean side of an oil separator coupled to a crankcase with a modeled pressure representing an expected pressure on the clean side of the oil separator, where the clean side of the oil separator is coupled to an intake conduit of an engine upstream of an intake throttle via a ventilation line.
A positive crankcase ventilation (PCV) system in an engine comprising:
- a crankcase including an interior chamber;
- an oil separator coupled to the crankcase;
- a PCV valve positioned in a PCV line coupled to the crankcase and an intake manifold in an intake system;
- a pressure sensor positioned on a clean side of the oil separator and spaced away from an end of a ventilation line, where the oil separator is coupled to the crankcase;
- and
- a controller including instructions stored in non-transitory memory that when executed cause the controller to:
- determine a fault condition in the PCV system by comparing a pressure sampled from the pressure sensor with a modeled pressure representing an expected pressure on the clean side of the oil separator.
A method for operating a positive crankcase ventilation (PCV) system in an engine comprising:
- sampling a pressure sensor positioned on a clean side of an oil separator coupled to a crankcase to determine a measured pressure, the oil separator coupled to an intake passage of the engine via a ventilation line;
- generating a modeled pressure representing an expected pressure on the clean side of the oil separator;
- comparing the measured pressure with the modeled pressure;
- and
- determining a fault condition based on the comparison between the measured pressure and the modeled pressure.
Dependencies are inferred from the claim text.