Engine management strategy to improve the ability of a catalyst to withstand severe operating enviroments
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United States of America Patent
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Feb 8, 2000
Grant Date -
N/A
app pub date -
Nov 24, 1997
filing date -
Nov 24, 1997
priority date (Note) -
Expired
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Abstract
A method and engine control strategy is described that enables improved catalyst performance after having been exposed to severe operating environments. More specifically, rhodium-containing catalysts are reactivated by being subjected to fuel-rich spikes after being exposed to high temperature, excess oxygen conditions which typically arise during programmed fuel-cut engine control strategies. Thus the present invention represents a departure from current control strategies by providing fuel-rich spikes during engine control modes when conventional practice is not to provide rich-fuel spikes.
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