Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-04-08
1994-10-25
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 123691, F01N 320
Patent
active
053577515
ABSTRACT:
A control system which provides a measurement of efficiency in a catalytic converter coupled to the engine exhaust. For each inducted airflow range in which the engine is operating, test periods are generated by counting transitions in the output of an upstream exhaust gas oxygen sensor. These test periods are limited to a maximum count. Concurrently, during each test period, transitions are counted in a downstream exhaust gas oxygen sensor. Upstream and downstream transitions are accumulated and a ratio of the accumulated totals determines converter efficiency.
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Ford Motor Company
Hart Douglas
Lippa Allan J.
May Roger L.
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