Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1996-10-18
1998-03-17
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
731173, F02M 2507, G01L 326
Patent
active
057275335
ABSTRACT:
A method and apparatus for monitoring an EGR system during normal vehicle operations is disclosed. An EGR valve located in an EGR passage controls the flow of exhaust gas to an intake manifold, and a sensor disposed in the air intake manifold downstream of air and EGR confluence point, monitors temperature of the mixture. A controller calculates a correlation function between a calculated desired EGR flow and the output of the manifold temperature sensor. If the value of correlation function is lower than a reference level, the monitoring system deterioration of EGR flow rate is indicated.
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Bidner David Karl
Gopp Alexander Y.
Patel Shailesh Natwarlal
Ford Global Technologies Inc.
Lippa Allan J.
May Roger L.
Wolfe Willis R.
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