Patent ID: 8240134
Filing Date: 2012-08-14
Classification: F01N,Y02T

Abstract:
1. An engine arrangement, comprising: an engine; an exhaust line downstream of the engine; an aftertreatment device in the exhaust line; an upstream device upstream of the aftertreatment device; a conduit between a source of cooling fluid and a point in the exhaust line upstream of the aftertreatment device and disposed between the upstream device and the aftertreatment device; a temperature sensor proximate the point in the exhaust line; a controller for receiving a signal from the temperature sensor; a valve in the conduit, the valve being controlled by the controller in response to the signal from the temperature sensor for selective introduction of cooling fluid into the exhaust line; and a second temperature sensor proximate a point where the conduit connects to the source of fluid, the controller receiving a signal from the second temperature sensor, the controller controlling the valve as a function of the signal from the first temperature sensor and the signal from the second temperature sensor, wherein the aftertreatment device comprises an SCR arranged to be operated within a predetermined range of temperatures, the upstream device is adapted to at least occasionally operate at a temperature greater than an upper temperature of the range of temperatures, and the valve is controlled by the controller to introduce cooling fluid into the exhaust when the upstream device is operated at or above the upper temperature.