Patent ID: 7673446
Filing Date: 2010-03-09
Classification: B01D,F01N,Y02T

Abstract:
1. A power system comprising: an engine configured to combust a fuel/air mixture to produce power and a flow of exhaust; a common inlet disposed to receive the flow of exhaust, the common inlet including a particulate filter; a first passageway configured to receive exhaust from the common inlet; a second passageway configured to receive exhaust from the common inlet in parallel with the first passageway; a common downstream passageway configured to receive exhaust from both the first and second passageways, the common downstream passageway including a selective catalytic reduction device; a valve arrangement configured to regulate the flow of exhaust to the first and second passageways; at least one sensor configured to sense a parameter indicative of a constituent of the exhaust and to generate a corresponding signal; and a controller in communication with the valve and the at least one sensor, the controller configured to affect operation of the valve arrangement and control flow through the first and second passageways in response to the signal.