On-board automotive exhaust catalyst monitoring with a calorimet

Details On-board automotive exhaust catalyst monitoring with a calorimet On-board automotive exhaust catalyst monitoring with a calorimet

1993-07-09

1995-08-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 320

Patent

active

054449740

ABSTRACT:
A calorimetric sensor comprising closely spaced, similarly constructed catalyzed (oxidation catalyst) and uncatalyzed members can be placed in the exhaust gas stream of an automotive engine downstream of a catalytic converter to aid assessment of the efficacy of the converter, especially when the exhaust is hot and at an appreciable steady flow rate and the engine is operating at the stoichiometric air-to-fuel ratio or lean of such ratio.

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Clemmens et al., "Detection of Catalyst Performance Loss Using On-Board Diagnostics", SAE Paper 900062.
Cai et al., "Unburnt Hydrocarbon Measurement by Means of a Surface Ionisation Detector", SAE Paper 910254.
Koupal et al., "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method", SAE Paper 910561.
Kotzan, "On-Board Diagnostics for Emission Control Systems", SAE Paper 911215.
Bogdanoff et al., "Overview of On-Board Diagnostic Systems Used on 1991 California Vehicles", SAE Paper 912433.
Hepburn et al., "The Relationship Between Catalyst Hydrocarbon Conversion Efficiency and Oxygen Storage Capacity", SAE Paper 920831.
Cai et al., "A Catalytic Oxidation Sensor for the On Board Detection of Misfire and Catalyst Efficiency", SAE Paper 922248.

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