Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-07-17
1997-01-21
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, F01N 320
Patent
active
055950612
ABSTRACT:
A catalyst deterioration-detecting device is provided with a control which includes a catalyst deterioration-determining section. When predetermined catalyst deterioration-determining conditions are established, the determining section determines a degraded state of the catalyst body by taking the successive steps of: respectively measuring first and second voltage signal-inverted states within a predetermined arithmetic operating time in accordance with inverted states of first and second voltage signals, thereby calculating an inverted state ratio; respectively measuring first and second voltage signal-surrounding areas within the predetermined arithmetic operating time in accordance with respective areas which are surrounded by loci of periods of time during which the first and second voltage signals are inverted, thereby calculating an area ratio; respectively measuring first and second voltage signal states within the predetermined arithmetic operating time in accordance with the first and second voltage signals, thereby calculating a voltage ratio; calculating a catalyst deterioration-measured value on the basis of the inverted state ratio, the area ratio, and the voltage ratio; and, comparing the catalyst deterioration-measured value and a catalyst deterioration-determining value, the latter being set for each engine load.
REFERENCES:
patent: 5337557 (1994-08-01), Toyoda
patent: 5379587 (1995-01-01), Toyoda
Hart Douglas
Suzuki Motor Corporation
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