Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1994-09-30
1996-03-12
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, F01N 320
Patent
active
054976189
ABSTRACT:
A control system and method maintains engine air/fuel operation near stoichiometry (104-178) in response to exhaust gas oxygen sensors (44,52) positioned both upstream and downstream of a catalytic converter (50). A non-catalytic exhaust gas oxygen sensor (54), having non-catalytic electrode, is positioned downstream of the converter (50) and its output voltage (Vo) monitored. Pumping current (Ip) is applied to an electrode of the non-catalytic sensor at a predetermined magnitude (IPREF) from a pumping current generator (56). When the output voltage (Vo) is detected at a predetermined high voltage range (302-318) an indication of degraded converter efficiency is provided (320).
REFERENCES:
patent: 5099647 (1992-03-01), Hamburg
patent: 5268086 (1993-12-01), Hamburg et al.
patent: 5313791 (1994-05-01), Hamburg
patent: 5363091 (1994-11-01), Kotwicki
patent: 5375413 (1994-12-01), Hamburg
Brailsford Alan D.
Hamburg Douglas R.
Logothetis Eleftherios M.
Yussouff Mohammed
Ford Motor Company
Hart Douglas
Lippa Allan J.
May Roger L.
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