Patent ID: 6964157
Filing Date: 2005-11-15
Classification: B01D

Abstract:
1. A system for temporarily removing NOx from an internal combustion engine exhaust stream at a lower temperature, and releasing the NOx back into the exhaust stream at a higher temperature, comprising: an EGR valve for regulating a flow rate of exhaust gas recirculated to the engine from the exhaust system; an engine control module having an input and being adapted to be connected to an internal combustion engine, said module for changing the flow rate through the EGR valve, thereby increasing a ratio of NO an occluder having an inlet adapted to be in communication with the exhaust stream of the engine and an outlet, the occluder including an adsorbent able to selectively adsorb NOx at temperatures below a predetermined temperature and able to desorb NOx at temperatures above the predetermined temperature; said catalytic converter connected to said occluder outlet; a temperature sensor producing said signal representing a temperature of the exhaust stream; and a sensor disposed downstream of said occluder outlet for generating said signal representing an oxygen concentration entering said catalytic converter indicating a loss of adsorption effectiveness of said occluder.