Systems and methods for reducing aftertreatment system NOX emissions
AssigneeCummins Emission Solutions Inc.
InventorsMatthew K. Volmerding, Simon Guest
Life of this patent
Estimating the term…
Abstract
A controller for an aftertreatment system coupled to an engine is configured to: in response to receiving an engine shutdown signal, determine an estimated amount of ammonia stored on a selective catalytic reduction (SCR) catalyst included in the aftertreatment system; in response to determining that the estimated amount of ammonia stored in the SCR catalyst is less than an ammonia storage threshold, cause flow of a heated gas towards the SCR catalyst; cause insertion of a reductant into an exhaust gas flowing through the aftertreatment system; and in response to determining that the estimated amount of ammonia stored in the SCR catalyst is equal to or greater than the ammonia storage threshold, cause shutdown of the engine.
Claims9
A controller for an aftertreatment system coupled to an engine, the controller configured to:
- in response to receiving an engine start signal, determine if a temperature of a selective catalyst reductant (SCR) catalyst is less than a temperature threshold without starting the engine;
- in response to the temperature being less than the temperature threshold, activate a heater located upstream of the SCR catalyst for a predetermined period of time without starting the engine, and cause flow of a gas through the heater towards the SCR catalyst included in the aftertreatment system so as to heat the SCR catalyst;
- and
- in response to the temperature being equal to or greater than the temperature threshold, cause the engine to start.
An aftertreatment system configured to be coupled to an engine, the aftertreatment system comprising:
- a selective catalytic reduction (SCR) catalyst;
- a heater;
- and
- a controller configured to:
- in response to receiving an engine start signal, determine if a temperature of the SCR catalyst is less than a temperature threshold without starting the engine;
- in response to the temperature being less than the temperature threshold, activate the heater located upstream of the SCR catalyst for a predetermined period of time without starting the engine, and cause flow of a gas through the heater towards the SCR catalyst so as to heat the SCR catalyst;
- and
- in response to the temperature being equal to or greater than the temperature threshold, cause the engine to start.
Dependencies are inferred from the claim text.