Catalyst monitor for a Y pipe exhaust configuration

Details Catalyst monitor for a Y pipe exhaust configuration Catalyst monitor for a Y pipe exhaust configuration

1993-12-16

1994-10-25

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, F02B 300

Patent

active

053577531

ABSTRACT:
Monitoring a catalyst positioned downstream of a Y-shaped exhaust path includes positioning an exhaust gas oxygen sensor just upstream and just downstream of the catalyst and using the two sensors together to monitor catalyst activity. Such monitoring is discontinued when the exhaust gas oxygen sensor switching rate of the upstream exhaust gas oxygen sensor is below a minimum threshold value. The upstream exhaust gas oxygen sensor does not provide an air fuel ratio feedback signal but instead, such a signal is provided by two additional exhaust gas oxygen sensors, one sensor being positioned in each of the two legs of the Y exhaust path coming from the engine.

REFERENCES:
patent: 4130095 (1978-12-01), Bowler
patent: 4235204 (1980-11-01), Rice
patent: 4373330 (1983-02-01), Stark
patent: 4819427 (1989-04-01), Nagai et al.
patent: 4831838 (1989-05-01), Nagai et al.
patent: 4881368 (1989-11-01), Demura
patent: 4905469 (1990-03-01), Matsuoka
patent: 4964271 (1990-10-01), Sawada
patent: 4964272 (1990-10-01), Kayanuma

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