Patent ID: 9212581
Filing Date: 2015-12-15
Classification: F01N,Y02A,Y02T

Abstract:
1. A method pertaining to an SCR system for an engine which generates exhaust when the engine operates, the engine including an exhaust duct, the engine also comprising a reducing agent dosing unit for supplying a reducing agent to the exhaust duct for exhaust cleaning at the exhaust duct, and a container for receiving reducing agent returned from said dosing unit; the method comprising: feeding reducing agent to said dosing unit, and leading back to said container an amount of said reducing agent that had been fed to said dosing unit; determining a cooling requirement of said dosing unit; and choosing a limit level for said amount of reducing agent in said container based on said cooling requirement, wherein said limit level for reducing agent in said container corresponds to a smallest desirable volume of reducing agent in said container.