Aftertreatment system implementing low-temperature SCR

摘要

An aftertreatment system for an engine is disclosed. The aftertreatment system may include an exhaust passage configured to receive an exhaust flow from the engine, and an injector disposed in the exhaust passage and configured to inject reductant into the exhaust flow. The aftertreatment system may also include a bypass conduit fluidly connected to the exhaust passage downstream of the injector, at least one valve disposed in the bypass conduit and configured to divert exhaust gases from the exhaust passage into the bypass conduit, and a reductant storage device disposed in the bypass conduit and configured to store ammonia in the exhaust gases. The aftertreatment system may also include a control module configured to selectively operate the at least one valve.

主权项

1. An aftertreatment system for an engine, comprising:
an exhaust passage configured to receive an exhaust flow from the engine; an injector disposed in the exhaust passage and configured to inject a reductant into the exhaust flow; a bypass conduit fluidly connected to the exhaust passage downstream of the injector; at least one valve disposed in the bypass conduit and configured to divert exhaust gases from the exhaust passage into the bypass conduit; a reductant storage device disposed in the bypass conduit and configured to store ammonia in the exhaust gases; a control module configured to selectively operate the at least one valve; a first sensor configured to indicate a temperature of the exhaust flow; and a second sensor configured to indicate a temperature of the reductant storage device, wherein the first and second sensors are electronically connected to the control module; wherein the control module is further configured to open the at least one valve when: the temperature of the exhaust flow is above a first threshold; and the temperature of the reductant storage device is above a release temperature.