Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...
Reexamination Certificate
2011-08-23
2011-08-23
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Having sensor or indicator of malfunction, unsafeness, or...
C060S274000, C060S285000, C060S295000, C060S301000
Reexamination Certificate
active
08001766
ABSTRACT:
In a process for monitoring the function capability of an exhaust-gas catalytic converter5located in the exhaust line3of an internal combustion engine1, based on the measured or computed signals of a first lambda probe6alocated upstream from the catalytic converter5and of a second lambda probe6blocated downstream from the catalytic converter5, the two lambda probes6a,6band the catalytic converter5having reached their operating temperature, it is suggested that an air quantity control means4located in the intake line2is partially opened during the coasting phase of the internal combustion engine1in order to cool the catalytic converter5located in the exhaust line3, so that in the catalytic converter5an axial temperature distribution forms over time, from the signals of the two lambda probes6a,6band the temperature distribution the axial distribution of the oxygen storage capacity OSC of the catalytic converter5being computed, and using this distribution of the oxygen storage capacity OSC the functional capability of the exhaust-gas catalytic converter5being assessed. As suggested, an improved process for checking is made available which moreover allows differentiation of the functional capability for conversion of hydrocarbons and nitrogen oxides.
REFERENCES:
patent: 5626014 (1997-05-01), Hepburn et al.
patent: 7076943 (2006-07-01), Lewis et al.
patent: 2002/0078683 (2002-06-01), Katayama et al.
patent: 10 2004 008 172 (2005-10-01), None
Audi AG
Bogue Jesse
Denion Thomas
Novak Druce & Quigg LLP
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