Importance

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Abstract

An exhaust treatment system for use with a power system is disclosed. The exhaust treatment system may have an SCR device (32), and an oxidation device (26) located upstream of the SCR device (32) to convert NO to NO2. The exhaust treatment system may also have an exhaust passageway (14) extending from an exhaust source (10) to the oxidation device (26), and a bypass passageway (24) extending from the exhaust passageway at a location upstream of the oxidation device to the exhaust passageway at a location downstream of the oxidation device (26). The exhaust treatment system may further have a valve element (20) configured to selectively direct exhaust from the exhaust source (10) through the oxidation device (26) and through the bypass passageway (24), at least one sensor configured to sense operating parameters of the exhaust source (10), and a controller (36) in communication with the valve element (20). The controller (36) may be configured to move the valve element (20) in response to an estimated ratio of NO to NO2 based on sensed operating parameters of the exhaust source (10).

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First Claim