Method and apparatus for measuring the efficacy of a catalytic c

Details Method and apparatus for measuring the efficacy of a catalytic c Method and apparatus for measuring the efficacy of a catalytic c

1993-11-04

1995-02-21

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

053904907

ABSTRACT:
An electronic engine controller (EEC) is utilized to perform an onboard diagnostic test of a catalytic converter. An upstream oxygen sensor detects the exhaust gas entering the catalytic converter and an downstream oxygen sensor detects the exhaust gas exiting the catalytic converter. An air/fuel mixture is maintained at a first bias level until the exhaust gas produced by combustion of the air/fuel mixture is detected by the downstream oxygen sensor at which point the air/fuel mixture is altered to a second bias level and maintained at the second bias level until the exhaust gas produced by combustion of the air/fuel mixture is detected by the downstream oxygen sensor. An amount of time required for the upstream oxygen sensor to detect the exhaust products of the first bias value and for the second bias value is calculated, and similar values are calculated for the downstream oxygen sensor. The EEC calculates a converter storage capacity value as a function of the first bias level and the first and second time durations and the second bias level and accompanying time durations, and is then compared against a predetermined minimum converter capacity value. If the converter storage capacity is less than or equal to the predetermined minimum converter capacity value then a converter inoperative condition is set.

REFERENCES:
patent: 3782347 (1974-01-01), Schmidt et al.
patent: 3957444 (1976-05-01), Goto
patent: 4015428 (1977-04-01), Kawai
patent: 4024850 (1977-05-01), Peter
patent: 4077364 (1978-03-01), Aoki
patent: 5138833 (1992-08-01), Kabasin

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