Apparatus for detecting purification factor of catalyst

Details Apparatus for detecting purification factor of catalyst Apparatus for detecting purification factor of catalyst

1991-01-18

1992-10-13

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 320

Patent

active

051540550

ABSTRACT:
An apparatus for detecting a purification factor of a catalyst for purifying an exhaust gas of an internal combustion engine comprises a catalyst disposed in an exhaust system of the internal combustion engine for purifying an exhaust gas, first and second air-fuel ratio sensors disposed upstream and downstream of the catalyst for detecting air-fuel ratios, respectively, a response delay time difference detecting device for detecting differences in response delay time between the first and second air-fuel ratio sensors in respective different operation states of the engine, a purification factor detecting device for detecting a purification factor of the catalyst on the basis of a deviation between the first and second response delay time differences detected in respective different operation states of the engine. Since the purification factor of the catalyst is detected on the basis of a deviation between the first and second response delay time differences detected in the respective different engine operation states, the purification factor of the catalyst can be detected with high accuracy independently of response characteristics of the first and second air-fuel ratio sensors themselves.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4622809 (1986-11-01), Abthoff
patent: 4739614 (1988-04-01), Katsumo et al.
patent: 5018348 (1991-05-01), Durschmidt

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