Crankcase integrity breach detection

摘要

Methods and systems are provided for using a crankcase vent tube pressure or flow sensor for diagnosing a location and nature of crankcase system integrity breach. The same sensor can also be used for diagnosing air filter plugging and PCV valve degradation. Use of an existing sensor to diagnose multiple engine components provides cost reduction and sensor compaction benefits.

主权项

1. A method for an engine, comprising:
measuring pressure in a crankcase vent tube with a pressure sensor arranged therein; and with a controller, determining whether an intake air filter is degraded based on the measured crankcase vent tube pressure and setting a diagnostic code if the intake air filter is degraded.