Manifold air flow (MAF) and manifold absolute pressure (MAP) residual electronic throttle control (ETC) security
First Claim
Patent Images
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.
13 Assignments
0 Petitions
Accused Products
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.
41 Citations
12 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
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. - View Dependent Claims (9, 10, 11, 12)
-
Specification