US 9,957,869 B2 · Device and method at an exhaust aftertreatment system for an engine

Abstract

A method at an exhaust gas cleaning system for an engine (235) in which a reducing agent is added to a passage (290) for exhaust gases from the engine (235) for cleaning the exhaust gases. The exhaust gas cleaning system includes arrangements (270) that require a certain temperature level (Tmax) in order to achieve catalytic exhaust gas cleaning. The method is to distribute and store (s430) a limited amount of reducing agent at temperature level (Tmax); and to use (s440) during a cold start of the exhaust gas cleaning system, the distributed and stored reducing agent to achieve the catalytic exhaust gas cleaning. Also a computer program product (200; 210) to implement the method. Also an arrangement for an exhaust gas cleaning system for an engine (235), and a motor vehicle (100) equipped with the arrangement.

Claims9

Dependent claims

A method for operating an exhaust gas cleaning system of a combustion engine, the system comprising:

an exhaust passage for leading exhaust gases from the engine to arrangements that require a selected temperature level (Tmax) in order to achieve catalytic exhaust gas cleaning, the arrangements including an SCR catalyst, and the method comprising the steps:
distributing and storing a limited amount of reducing agent in the exhaust gas passage upstream of the SCR catalyst of the arrangements at a temperature that does not exceed the selected temperature level (Tmax) and at a wall of the exhaust passage upstream of a vaporization module that is arranged upstream of the SCR catalyst and
during the cold start of the exhaust gas cleaning system, using the distributed and stored reducing agent to achieve the catalytic exhaust gas cleaning.

Dependencies are inferred from the claim text.

Device and method at an exhaust aftertreatment system for an engine

Life of this patent

Device and method at an exhaust aftertreatment system for an engine

Life of this patent

Abstract

Claims9