IP Library › Granted Patent US 7,069,773
Granted Patent B2
US 7,069,773 · App. 10/831,764 · Granted Jul 4, 2006

Manifold air flow (MAF) and manifold absolute pressure (MAP) residual electronic throttle control (ETC) security

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Quick Facts
Patent No.
US 7,069,773
App. No.
10/831,764
Filed
Apr 23, 2004
Granted
Jul 4, 2006
Kind
B2
Art Unit
2855
USPC
73/116
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.

Claims (19)

1. 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.

2. The engine fault diagnostic of claim 1 further comprising a MAP sensor that generates a MAP signal.

3. The engine fault diagnostic system of claim 2 wherein said MAP error signal is determined based on an estimated MAP and said MAP signal.

4. The engine fault diagnostic of claim 1 further comprising a MAF sensor that generates a MAF signal.

5. The engine fault diagnostic system of claim 4 wherein said MAF error signal is determined based on an estimated MAF and said MAF signal.

6. The engine fault diagnostic of claim 1 further comprising a throttle module that calculates an estimated MAF based on a MAP signal and a throttle position signal, wherein said MAF error signal is based on said estimated MAF and said MAF signal.

7. The engine fault diagnostic of claim 1 further comprising an intake module that calculates an estimated MAP based on a MAF signal and a throttle position signal, wherein said MAP error signal is based on said estimated MAP and said MAP signal.

8. 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.

9. The method of claim 8 further comprising generating a MAP signal using a MAP sensor, wherein said MAP error is determined based on an estimated MAP and said MAP signal.

10. The method of claim 8 further comprising generating a MAF signal using a MAF sensor, wherein said MAF error is determined based on an estimated MAF and said MAF signal.

11. The method of claim 8 further comprising calculating an estimated MAF based on a MAP signal and a throttle position signal, wherein said MAF error is based on said estimated MAF and said MAF signal.

12. The method of claim 8 further comprising calculating an estimated MAP based on a MAF signal and a throttle position signal, wherein said MAP error is based on said estimated MAP and said MAP signal.