Control device for an internal combustion engine

Details Control device for an internal combustion engine Control device for an internal combustion engine

2007-07-31

2007-07-31

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S276000, C060S285000, C060S278000

Reexamination Certificate

active

11315239

ABSTRACT:
Prior to failure determination of a three-way catalyst, which is carried out on the basis of a reverse frequency ratio of upstream and downstream O2sensors, deterioration determination is performed at the point when the reverse frequency ratio of the O2sensors starts to increase, and low NOx control is then implemented. The implement of the low NOx control makes it possible to compensate for the deterioration of the three-way catalyst with respect to NOx purification and to keep NOx emissions from the three-way catalyst equal to or less than the regulation value.

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patent: 2001-263100 (2001-09-01), None

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