A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine
a control system and combustion engine technology, applied in the direction of engines, machines/engines, mechanical apparatus, etc., can solve the problems of exhaust gas heat of exhaust treatment components, permanent damage, and inability to provide optimal treatment of exhaust gases by exhaust treatment components
Inactive Publication Date: 2019-04-04
SCANIA CV AB
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AI Technical Summary
Benefits of technology
The present invention aims to control the flow of exhaust gases in an exhaust line with a view to optimizing treatment of the gas by an exhaust treatment component, particularly at high temperatures. The control system initiates movement of a valve arrangement to direct the exhaust gases either to the treatment component or to an evaporator depending on the temperature of the treatment component. This ensures that the exhaust gases are cooled down to a safe temperature before they enter the treatment component, thereby avoiding damage to the component. Additionally, the temperature of the exhaust gases is reduced when they pass through the treatment component, leading to improved efficiency of the evaporator.
Problems solved by technology
However, in case when the combustion engine is high loaded during a longer period of time, there is a risk that the exhaust gases heat the exhaust treatment components to a too high temperature.
In this cases, the exhaust treatment components do not provide an optimal treatment of the exhaust gases and might be permanently damaged.
Method used
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Embodiment Construction
[0022]FIG. 1 shows a schematically disclosed vehicle 1 powered by a supercharged combustion engine 2. The combustion engine 2 may be a diesel engine. The vehicle 1 may be a heavy vehicle. The vehicle 1 comprises an exhaust line 3 receiving exhaust gases from the combustion engine 2. The exhaust line 3 comprises a turbine 4 of a turbo aggregate. The exhaust gases in the exhaust line 3 receive a reduced pressure and a reduced temperature when they expand through the turbine 4a of a turbo charger 4. A number of schematically disclosed exhaust treatment components 5 are arranged in the exhaust line 3 in a position downstream of the turbine 4a. The exhaust treatment components 5 may, for example, include one or several of the following exhaust treatment components namely an oxidation catalytic converter DOC, a particulate filter DPF, a SCR catalytic converter and an ammonia slip catalytic converter ASC. The efficiency of each exhaust treatment component 5 depends on its temperature. An e...
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The present invention relates a control system and a method for controlling exhaust flow in an exhaust line of a combustion engine comprising at least one exhaust treatment component and an evaporator of a waste heat recovery system. The control system comprises a valve arrangement in the exhaust line control unit, a temperature sensor to sense a temperature of the exhaust treatment component and a control unit configured to position the valve arrangement in a first position, when the exhaust treatment component has a lower temperature than a specific temperature of exhaust gases directed flow through to the exhaust treatment component before being directed to flow through the evaporator, and in a second position, when the exhaust treatment component has a higher temperature than said specific temperature of exhaust gases that are directed to flow through the evaporator before being directed to flow through the exhaust treatment component.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This application is a national stage application (filed under 35 § U.S.C. 371) of PCT / SE2017 / 050249, filed Mar. 15, 2017 of the same title, which, in turn claims priority to Swedish Application No. 1650345-0, filed Mar. 15, 2016 of the same title; the contents of each of which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to a control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine.BACKGROUND OF THE INVENTION[0003]Exhaust lines of internal combustion engines such as diesel engines may comprise a plurality of exhaust treatment components such as, for example, a SCR catalyst (Selective Catalytic Reduction). In order to clean the exhaust gases from nitrogen oxides, a urea solution is sprayed into the exhaust line in a position upstream of the SCR catalyst. The urea solution is vaporized by the hot exhaust gases so that ammonia is formed. The...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01N5/02F01N3/02F01N3/20
CPCF01N5/02F01N3/0205F01N3/2006F01N3/2093F01N3/28F01N2240/02Y02A50/20Y02T10/12F01N3/2882F01N2240/36
Inventor LINDERYD, JOHANUSSNER, MATTHIASELLIASSEN, TORBJORNTIMREN, THOMAS
Owner SCANIA CV AB