US 12,352,189 B2
Method and system for positive crankcase ventilation (PCV) diagnostics
Adam Krach, Canton, MI (US); Michael Casedy, Ann Arbor, MI (US); Jose Francisco Martinez Leyva, Mexico City (MX); Katherine Jane Brewer, Belleville, MI (US); Erzabeth Holcombe, Northville, MI (US); and Hussein Saab, Dearborn, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Dec. 4, 2023, as Appl. No. 18/528,152.
Prior Publication US 2025/0179950 A1, Jun. 5, 2025
Int. Cl. F01M 13/00 (2006.01); F01M 13/02 (2006.01); G07C 3/08 (2006.01)
CPC F01M 13/028 (2013.01) [G07C 3/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
at a controller, executing a nominal crankcase pressure model corresponding to a crankcase location to determine a nominal crankcase pressure of a positive crankcase ventilation (PCV) system;
executing a faulted crankcase pressure model corresponding to the crankcase location to determine a faulted crankcase pressure of the PCV system;
determining a difference between the nominal crankcase pressure and the faulted crankcase pressure;
diagnosing a PCV system component based on the difference between the nominal crankcase pressure and the faulted crankcase pressure; and
responsive to the crankcase pressure sensor having a faulted diagnosis, triggering a sensor degradation indicator;
where the crankcase location is positioned within the crankcase.