Exhaust system with bypass catalytic converter and diagnostics

Details Exhaust system with bypass catalytic converter and diagnostics Exhaust system with bypass catalytic converter and diagnostics

1995-08-31

1996-06-04

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60288, F01N 320

Patent

active

055222196

ABSTRACT:
An emission control system including an auxiliary catalytic converter (50) coupled upstream of a main catalytic converter (44) via a bypass valve (52). Exhaust gas flow is first routed through the auxiliary converter (50) by opening one bypass valve (52) and closing another (48) when an indication of exhaust gas temperature is above a predetermined temperature. An indicating signal is derived from transitions in output of an exhaust gas sensor (58) position downstream of the auxiliary converter (50). Degraded operation of the auxiliary converter (50) is provided when both the indicating signal indicates degraded operation and an indication of inducted airflow exceeds a preselected airflow (324). Degraded operation of one bypass valve (48) is provided when the indicating signal indicates degraded operation and the inducted airflow is below the preselected airflow (340-354).

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