Scania Cv Ab

Henrik Birgersson

Magnus Nilsson

Morgan Colling

Andreas Liljestrand

Daniel Norling

Magnus Wahlberg

Niklas Nordin

Hans Göransson

Daniel Ryrfeldt

Markus Mustonen

Stefan Orrling

David Tempelmann

Per Birkestad

Fatima Strand

Emelie Lagerkvist

Rickard Gunsjö

Robin Hellsing

Tommy Eriksson

Eric Furbo

Fatima El Itabi

An exhaust additive distribution arrangement for an exhaust system of an internal combustion engine () includes an exhaust duct element (), an exhaust additive injection unit (), and a primary vaporization element (); wherein the primary vaporization element () is a tubular body arranged in the interior of the exhaust duct element (), has a predefined space between an inner surface of the exhaust duct element () and an outer surface of the primary vaporization element (), and protrudes from the exhaust duct element () at an outlet end; and wherein the exhaust additive injection unit () is arranged to inject exhaust additive liquid from a point at the inner surface of the exhaust duct element () towards an inner surface of the primary vaporization element (). The exhaust additive injection unit () is of the liquid-only type, and the primary vaporization element () has a length that is sufficiently short to allow injected exhaust additive liquid to run off of the outlet end of the primary vaporization element (). The present invention also concerns an exhaust additive distribution system and a vehicle () comprising the exhaust additive distribution arrangement.

Exhaust additive distribution arrangement and system

An exhaust treatment system is provided, which comprises: a first oxidation catalyst, to oxidize compounds comprising one or more of nitrogen, carbon, and hydrogen; a first dosage device to supply a first additive into an exhaust stream; a catalytic filter, consisting of a particulate filter with an at least partly catalytic coating with reduction characteristics, for catching and oxidizing soot particles and for a first reduction of an amount of nitrogen oxides in the exhaust stream using the first additive; a second oxidation catalyst, to oxidize one or more of nitrogen oxide and incompletely oxidized carbon compounds in the exhaust stream; a second dosage device to supply a second additive into the exhaust stream; and a reduction catalyst device, arranged for a second reduction of nitrogen oxides in the exhaust stream using at least one of the first or second additives.

Exhaust treatment system and method for treatment of an exhaust gas stream

A method and an exhaust treatment system are provided for treatment of an exhaust stream comprising nitrogen oxides. The method comprises a first oxidation of compounds comprising one or more of nitrogen, carbon and hydrogen in the exhaust stream; a determination of a value for a ratio between a first amount of nitrogen dioxide and a first amount of nitrogen oxides after the first oxidation; and a first supply of a first additive into the exhaust stream, which is actively controlled based on the determined value for the ratio. Subsequently, a first reduction of at least the first amount of nitrogen oxides is carried out through a catalytic reaction in a catalytic filter, which consists of a particulate filter with an at least partly catalytic coating with reduction characteristics, and is arranged to catch and oxidize soot particles, and to carry out the first reduction of the first amount of nitrogen oxides.

Method and exhaust treatment system for treatment of an exhaust gas stream

An exhaust treatment system arranged for treatment of an exhaust stream is presented. The exhaust treatment system comprises a first reduction catalyst device arranged for reduction of nitrogen oxides in said exhaust stream through the use of compounds comprising one or several of carbon monoxide and hydrocarbons, which are comprised in said exhaust stream when said exhaust stream reaches said first reduction catalyst device; a particulate filter which is arranged downstream of said first reduction catalyst device to catch and oxidize soot particles in said exhaust stream; a second dosage device arranged downstream of said particulate filter and arranged to supply an additive comprising ammonia or a substance from which ammonia may be extracted and/or released into said exhaust stream; and a second reduction catalyst device, arranged downstream of said second dosage device and arranged for reduction of nitrogen oxides in said exhaust stream through the use of said additive.

An exhaust treatment system and method for the treatment of an exhaust stream from a combustion engine are provided. A first oxidation of compounds comprising one or more of nitrogen, carbon and hydrogen in the exhaust stream is carried out by a first oxidation catalyst. Further, a value (NO2_1/NOx_1)det for a ratio between a first amount of nitrogen dioxide and a first amount of nitrogen oxides leaving said first oxidation catalyst is determined. Active control of at least one parameter related to the combustion engine is carried out, based on the determined value, so that the ratio is impacted. A first additive is supplied into the exhaust stream, following which a first reduction of the first amount of nitrogen oxides is carried out through a catalytic reaction in a catalytic filter, which consists of a particulate filter with an at least partly catalytic coating with reduction characteristics. The catalytic filter is arranged for catching and oxidizing of soot particles, and to carry out the first reduction of the first amount of nitrogen oxides using the first additive.

Method and system for treatment of an exhaust gas stream

A method at an exhaust gas cleaning system for an engine () in which a reducing agent is added to a passage () for exhaust gases from the engine () for cleaning the exhaust gases. The exhaust gas cleaning system includes arrangements () that require a certain temperature level (Tmax) in order to achieve catalytic exhaust gas cleaning. The method is to distribute and store (s) a limited amount of reducing agent at temperature level (Tmax); and to use (s) 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 () to implement the method. Also an arrangement for an exhaust gas cleaning system for an engine (), and a motor vehicle () equipped with the arrangement.

Device and method at an exhaust afterteatment system for an engine

An exhaust treatment system comprising: a first dosage device, arranged to supply a first additive into said exhaust stream; a first reduction catalyst device, downstream of said first dosage device arranged for reduction of nitrogen oxides in said exhaust stream through the use of said first additive; a particulate filter, at least partly comprising a catalytically oxidizing coating, which is downstream of said first reduction catalyst device to catch soot particles, and to oxidize one or several of nitrogen oxide and incompletely oxidized carbon compounds in said exhaust stream; a second dosage device, downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device, downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream, with the use of at least one of said first and said second additive.

Exhaust treatment system and method for treatment of an exhaust stream

An exhaust treatment system comprising: a first oxidation catalyst to oxidize nitrogen compounds and/or hydrocarbon compounds in said exhaust stream; a first dosage device downstream of said first oxidation catalyst to supply a first additive into said exhaust stream; a first reduction catalyst device downstream of said first dosage device for reduction of nitrogen oxides in said exhaust stream using said first additive; a particulate filter, comprising a catalytically oxidizing coating downstream of said first reduction catalyst device to catch soot particles and oxidize one or several of nitrogen oxide and incompletely oxidized carbon compounds in said exhaust stream; a second dosage device downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream, using at least one of said first and second additive.

Device and method comprising double reducing devices and a catalytically coated particle filter for treatment of an exhaust stream

An exhaust treatment system comprising: a first oxidation catalyst to oxidize nitrogen- and/or hydrocarbon compounds in an exhaust stream; a first dosage device downstream of said first oxidation catalyst to supply a first additive into said exhaust stream; a first reduction catalyst device, arranged downstream of said first dosage device, including a slip-catalyst primarily for reduction of nitrogen oxides (NOx), and secondarily for oxidation of additive; a second oxidation catalyst arranged downstream of said first reduction catalyst; a particulate filter arranged downstream of said oxidation catalyst; a second dosage device, arranged downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device, arranged downstream of said second dosage device for reduction of nitrogen oxides in said exhaust stream, with the use of at least one of said first and said second additive.

An exhaust treatment system comprising: a first dosage device to supply a first additive into an exhaust stream; a first reduction catalyst device downstream of said first dosage device, including a slip-catalyst primarily for reduction of nitrogen oxides (NOx) through the use of the additive, and secondarily for oxidation of additive; an oxidation catalyst downstream of said first reduction catalyst device; a particulate filter downstream of said oxidation catalyst; a second dosage device downstream of said particulate filter to supply a second additive into said exhaust stream; a second reduction catalyst device downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream using at least one of said first and said second additive.

Methods and systems are provided for treatment of an exhaust stream that comprises nitrogen oxides NO. The method comprises supplying a first additive to the exhaust stream as a first reduction of a first amount of nitrogen oxides NOreaching a first device, arranged to impact the first amount of nitrogen oxides NO. The method also comprises supplying a second additive to the exhaust stream, which is used as a second reduction of a second amount of nitrogen oxides NOreaching a second device, arranged to reduce the second amount of nitrogen oxides NO. At least one of the first supply and the second supply is controlled, based on a total ability for the first device to provide the first reduction, and for the second device to provide the second reduction, so that a required total reduction on the nitrogen oxides NOin the exhaust stream is provided.

Method and system for controlling nitrogen oxide emissions from a combustion engine

A method and an exhaust treatment system are provided for treatment of an exhaust stream that comprises nitrogen oxides NO. The method comprises using a first slip-catalyst SC, arranged at a first device to create a first impact on a first amount of nitrogen oxides NOAn NO-storing catalyst may store nitrogen oxides NO. The first slip-catalyst SCmay reduce nitrogen oxides NO, and/or oxidize potential additive in the exhaust stream. This first impact is actively controlled, based on the first amount of nitrogen oxides NOreaching the first device. The method also comprises a second impact on a second amount of nitrogen oxides NOreaching a second device. The active control of the first impact may be by active control of the dosage of additive at the first device, and/or through an active control of an exhaust environment, for example, a temperature for the exhaust stream.

Device and method for impacting the amount of nitrogen oxides in exhaust gases from an internal combustion engine

An exhaust treatment system comprising a first oxidation catalyst to oxidize nitrogen and/or carbon compounds in an exhaust stream and a first dosage device downstream of said first oxidation catalyst to supply a first additive. A first reduction catalyst device is arranged downstream of said first dosage device for reduction of nitrogen oxides using said first additive, and for the generation of heat, through at least one exothermal reaction with said exhaust stream. A particulate filter arranged downstream of said first reduction catalyst device to catch soot particles and a second dosage device, arranged downstream of said particulate filter to supply a second additive. A second reduction catalyst device is arranged downstream of said second dosage device for reduction of nitrogen oxides in said exhaust stream, through the use of at least one of said first and said second additive.

System and method for purification of an exhaust stream by use of two reduction catalysts

An exhaust treatment system is provided for treatment of an exhaust stream, where the system comprises a first dosage device, arranged to supply a first additive into said exhaust stream and a first reduction catalyst device, arranged downstream for reduction of nitrogen oxides in said exhaust stream through the use of said first additive, and for the generation of heat through at least one exothermal reaction with said exhaust stream. A particulate filter arranged downstream of said first reduction catalyst device to catch soot particles. A second dosage device arranged downstream of said particulate filter to supply a second additive into said exhaust stream and a second reduction catalyst device, arranged downstream of said second dosage device for reduction of nitrogen oxides in said exhaust stream through the use of at least one of said first and said second additive.

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Stockholm, Sweden

Henrik Birgersson