Exhaust emission control failure detection system for internal c

Details Exhaust emission control failure detection system for internal c Exhaust emission control failure detection system for internal c

1990-07-26

1991-10-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60290, F01N 328

Patent

active

050604740

ABSTRACT:
In an exhaust emission control system for an internal combustion engine, a secondary air is selectively introduced into an exhaust passage at a first position upstream of a catalytic converter. A failure detection system utilizes a plurality of temperatures of an exhaust gas for detecting a failure of the exhaust emission control system. A first temperature is derived at a second position between the first position and the catalytic converter when the secondary air is introduced into the exhaust passage at the first position. A second temperature is derived at the second position when no secondary air is introduced into the exhaust passage at the first position. By comparing the first and second temperature, it is detected whether the exhaust emission control system includes a failure. Third and fourth temperatures may also be derived at a third position located inside or downstream of the catalytic converter, which respectively correspond to the first and second temperatures. By comparing a difference between the first and third temperatures and a difference between the second and fourth temperatures, it is detected whether the exhaust emission control system includes a failure.

REFERENCES:
patent: 3969932 (1976-07-01), Rieger
patent: 4729220 (1988-03-01), Terasaka

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