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US 2016/0097355 A1Published application
Crankcase integrity breach detection
AssigneeFord Global Technologies, LLC
InventorsRobert Roy Jentz, John Eric Rollinger, Rommel Racelis, Michael Stephen Sweppy
Life of this patent
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Abstract
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. Integrated CVT pressure readings are used to diagnose disconnection of the CVT on the air intake side and distinguish from disconnection on the crankcase side. Use of integrated pressure readings allows for a more reliable and quicker diagnosis even at lower engine airflows.
Claims20
A method for an engine, comprising:
- indicating crankcase ventilation system breach based on an integrated value of actual crankcase vent tube pressure over a duration of transient engine airflow relative to an integrated value of expected crankcase vent tube pressure over the duration.
A method for an engine, comprising:
- over a duration of transient engine airflow,
- collecting a plurality of actual crankcase vent tube pressure readings while estimating corresponding expected crankcase vent tube pressure readings;
- and
- after the duration,
- integrating each of the collected plurality of actual crankcase vent tube pressure readings and the estimated corresponding expected crankcase vent tube pressure readings;
- and
- indicating disconnection of a crankcase vent tube based on a ratio of a first integrated value of the actual pressure readings relative to a second integrated value of the estimated pressure readings being lower than a threshold.
4 more elements
A method for an engine, comprising:
- indicating disconnection of a crankcase vent tube on a first side based on an integrated value of actual crankcase vent tube pressure readings collected over a first duration of transient engine airflow;
- and
- indicating disconnection of the crankcase vent tube on a second, opposite side based on an integrated value of actual vent tube pressure readings collected over a second duration of engine cranking and run-up.
Dependencies are inferred from the claim text.