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US 9,612,174 B2Granted
Method and systems for exhaust gas recirculation valve diagnosis based on crankcase pressure
AssigneeGeneral Electric Company
InventorsEric David Peters, Nicholas Eric Hansen
Life of this patent
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Abstract
Various methods and systems are provided for diagnosing an exhaust gas recirculation valve based on crankcase pressure. In one example, a method comprises indicating a condition of a valve disposed in a first exhaust passage downstream from a cylinder exhaust valve based at least in part on a crankcase pressure.
Claims10
A system, comprising:
- a crankcase pressure sensor operable to measure a crankcase pressure of a crankcase in an engine;
- an exhaust gas recirculation (EGR) system including:
- a first valve configured to route exhaust to an exhaust passage of the engine;
- and
- a second valve configured to route exhaust to an intake passage of the engine;
- an exhaust manifold pressure sensor positioned in an exhaust manifold, upstream of the first valve and the second valve, the exhaust manifold pressure sensor configured to measure an exhaust pressure;
- and
- a controller configured to:
- indicate an operating condition of one or more of the first valve or the second valve based at least in part on a signal received from the crankcase pressure sensor;
- and
- indicate the operating condition of the one or more of the first valve or the second valve when a steady-state value of the signal received from the crankcase pressure sensor is over a threshold crankcase pressure signal value while the exhaust pressure is over a threshold exhaust pressure.
8 more elements
A system, comprising:
- a crankcase pressure sensor operable to measure a crankcase pressure of a crankcase in an engine;
- an exhaust gas recirculation (EGR) system including:
- a first valve configured to route exhaust to an exhaust passage of the engine;
- and
- a second valve configured to route exhaust to an intake passage of the engine;
- an exhaust manifold pressure sensor positioned in a first exhaust manifold, upstream of the first valve and the second valve, and configured to measure an exhaust pressure;
- and
- a controller configured to:
- indicate an operating condition of one or more of the first valve or the second valve in response to a signal received from the crankcase pressure sensor;
- and
- diagnose which of the first valve or the second valve is being indicated based on commanded positions of the first valve and the second valve and the exhaust pressure.
8 more elements
Dependencies are inferred from the claim text.