초록 ▼

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, exc

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.

대표청구항 ▼

[ What is claimed is:] [1.] An engine control unit that comprises an engine map which defines a region of engine operation that once entered and exited after a fuel cut or rate of engine deceleration greater than a predetermined amount, and that generates a signal to activate means for providing a r

[ What is claimed is:] [1.] An engine control unit that comprises an engine map which defines a region of engine operation that once entered and exited after a fuel cut or rate of engine deceleration greater than a predetermined amount, and that generates a signal to activate means for providing a rich-fuel spike to regenerate the rhodium component of rhodium-containing catalyst.