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US 8,478,476 B2Granted
System for detecting operating errors in a variable valve timing engine using pressure sensors
AssigneeGM Global Technology Operations LLC
InventorsMatthew A. Wiles, Craig D. Marriott
Life of this patent
Estimating the term…
Abstract
A method and control module includes a pressure sensor data comparison module that compares measured pressure volume signal segments to ideal pressure volume segments. A valve actuation hardware remedy module performs a hardware remedy in response to comparing the measured pressure volume signal segments to the ideal pressure volume segments when a valve actuation hardware failure is detected.
Claims16
A method comprising:
- measuring, using a pressure signal module, cylinder pressures at a plurality of points of a combustion cycle;
- retrieving, using a pressure sensor data comparison module, predetermined cylinder pressures for the plurality of points from memory;
- comparing, using the pressure sensor data comparison module, the predetermined cylinder pressures to the measured cylinder pressures;
- determining, using the pressure sensor data comparison module, variances based on the measured cylinder pressures and the predetermined cylinder pressures;
- selectively, using a valve actuation hardware remedy module, diagnosing a fault in a switchable roller finger follower (SRFF) mechanism based on the variances;
- and
- performing, using the valve actuation hardware remedy module, a valve actuation hardware remedy in response to the fault in the SRFF mechanism.
4 more elements
A control module comprising:
- a pressure signal module that generates measured cylinder pressures at a plurality of points of a combustion cycle;
- a pressure sensor data comparison module that retrieves predetermined cylinder pressures for the plurality of points from memory, that compares the measured cylinder pressures to the predetermined pressures, and that determines variances based on the measured cylinder pressures and the predetermined cylinder pressures;
- and
- a valve actuation hardware remedy module that selectively diagnoses a fault in a switchable roller finger follower (SRFF) mechanism based on the variances and that performs a hardware actuation remedy in response to the fault in the SRFF mechanism.
1 more element
Dependencies are inferred from the claim text.