SYSTEMS AND METHODS FOR THERMAL MANAGEMENT OF AFTERTREATMENT SYSTEM COMPONENTS

摘要

An exhaust aftertreatment system includes an oxidation catalyst and a selective catalytic reduction (SCR) catalyst disposed in an exhaust stream of an internal combustion engine. A stay warm thermal management strategy is employed after warm-up of the aftertreatment system is complete to maintain the aftertreatment system above a temperature providing a desired performance threshold of one or more components of the aftertreatment system, such as the oxidation catalyst or the SCR catalyst.

主权项

1. A method comprising:
warming up an exhaust aftertreatment system component in an exhaust system connected to an internal combustion engine above a warmed-up temperature threshold indicating completion of a warm-up mode of operation of the internal combustion engine connected to the exhaust system; initiating a stay warm operating mode to maintain the exhaust aftertreatment system component above a stay warm temperature threshold providing a desired performance of the aftertreatment system component, wherein initiating the stay warm operating mode includes:
determining the warm-up mode of operation is complete;determining a temperature drop of the exhaust aftertreatment component below the stay warm temperature threshold; and dosing hydrocarbons for receipt into the exhaust system upstream of an oxidation catalyst in response to initiating the stay warm operating mode to warm the exhaust aftertreatment system component to a target temperature.