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US 7,069,773 B2Granted
Manifold air flow (MAF) and manifold absolute pressure (MAP) residual electronic throttle control (ETC) security
AssigneeGeneral Motors Corporation
InventorsJoseph M. Stempnik, Colin A. Roberts, Kerfegar K. Katrak, Paul A. Bauerle, Bruce A. Rogers
Life of this patent
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Abstract
An engine fault diagnostic system includes a diagnostic module that generates a manifold absolute pressure (MAP) error signal and that generates a mass air flow (MAF) error signal. A security module generates an air flow fault when the MAP error signal exceeds a MAP threshold and the MAF error signal exceeds a MAF threshold.
Claims12
An engine fault diagnostic system, comprising:
- a diagnostic module that generates a manifold absolute pressure (MAP) error signal and that generates a mass air flow (MAF) error signal;
- a security module that generates an air flow fault when said MAP error signal exceeds a MAP threshold and said MAF error signal exceeds a MAF threshold;
- and
- a throttle position sensor that generates a throttle position signal, wherein said security module determines said MAP threshold and said MAF threshold based on said throttle position signal.
1 more element
A method of monitoring an air flow condition of an engine intake system, comprising:
- determining a manifold absolute pressure (MAP) error;
- determining a mass air flow (MAF) error;
- generating an air flow fault when said MAP error exceeds a MAP threshold and said MAF error exceeds a MAF threshold;
- and
- generating a throttle position signal using a throttle position sensor, wherein said MAP threshold and said MAF threshold are based on said throttle position signal.
2 more elements
Dependencies are inferred from the claim text.