Closed loop control for desulfating a NO.sub.x trap

Details Closed loop control for desulfating a NO.sub.x trap Closed loop control for desulfating a NO.sub.x trap

1997-09-02

1999-11-16

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 60295, F01N 300

Patent

active

059836270

ABSTRACT:
A system and method for desulfating an NO.sub.x trap utilizes a closed loop control of the air-to-fuel (A/F) ratio to accurately maintain a precise A/F ratio during desulfation. An oxygen sensor is positioned in the middle of the trap to provide an actual A/F ratio measurement, which is subsequently compared to a target A/F ratio to generate a correction signal to adjust operation of the engine's fuel injector(s). The trap oxygen sensor can also be used to adaptively update engine state conditions for a more precise switch-over to a trap regeneration phase.

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patent: 5740669 (1998-04-01), Kinugasa et al.
patent: 5743083 (1998-04-01), Hepburn

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