Device for determining deterioration of a catalytic converter fo

Details Device for determining deterioration of a catalytic converter fo Device for determining deterioration of a catalytic converter fo

1992-10-06

1994-04-12

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

053015010

ABSTRACT:
A device for determining a deterioration of a catalytic converter for an engine equipped with a catalytic converter disposed in the exhaust passage and upstream and downstream air-fuel ratio sensors disposed in the exhaust passage upstream and downstream of the catalytic converter, respectively, wherein the device calculates the lengths of the output response curves of the upstream and downstream air-fuel ratio sensors LVOM and LVOS, respectively when the engine air-fuel ratio is feedback controlled, then the device determines whether or not the catalyst is deteriorated in accordance with the magnitude of the ratio LVOS/LVOM.

REFERENCES:
patent: Re33942 (1992-06-01), Katsuno et al.
patent: 4177787 (1979-12-01), Hattori et al.
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 4817383 (1989-04-01), Masui
patent: 5088281 (1992-02-01), Izutani et al.
patent: 5119628 (1992-06-01), Uema et al.
John W. Koupal et al., "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method," Jul. 31, 1991, pp. 135-146 (SAE Technical Paper Series 910561).
William B. Clemmens, et al., "Detection of Catalyst Performance Loss Using On-Board Diagnostics," Feb. 26-Mar. 2, 1990, pp. 1-18; International Congress and Exposition--Detroit, Mich. (SAE Technical Paper Series 900062).

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