EXHAUST AFTER TREATMENT SYSTEM WITH A PASSIVE NOx ADSORBER AND A HEATABLE SCR CATALYTIC CONVERTER
a treatment system and catalytic converter technology, applied in the direction of exhaust treatment, mechanical equipment, engine components, etc., can solve the problems of high pna temperature, no/sub>x/sub>desorption, and the possibility of empty pna, etc., and achieve the effect of hardly any delay and easy control
Inactive Publication Date: 2020-05-28
FEV EURO GMBH
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The patent describes a control system for heating a vehicle's exhaust gas treatment system, specifically the SCR catalytic converter. The system is set up to continuously measure the temperature of the SCR converter and quickly turn on the heating device if the temperature gets too low. This ensures that the heating device is only turned on when necessary, saving energy and ensuring optimal performance of the exhaust gas treatment system.
Problems solved by technology
For the combined use of a PNA and an SCR catalytic converter, the temperature properties of the PNA must be taken into account, as this affects the possibility of having an empty PNA at the end of engine operation.
Thus, low adsorption stability of the NOx can cause very early NOx desorption, if for example strong acceleration of the internal combustion engine takes place in cold start conditions or in the warm-up phase.
This results in high temperatures in the PNA with continued low temperatures in the SCR catalytic converter.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016]FIG. 1 shows an exhaust aftertreatment system according to the disclosure for an internal combustion engine. The exhaust aftertreatment system comprises an exhaust pipe 1, a passive NOx adsorber 2 arranged in the exhaust pipe 1, an injector 3 arranged in the exhaust pipe, a mixer arranged in the exhaust pipe 4, an SCR catalytic converter 5 arranged in the exhaust pipe and a heating device 6 arranged in the exhaust pipe. The exhaust pipe 1 is fluidically connected to the outlet of the combustion engine and the exhaust gas of the combustion engine flows through the exhaust pipe 1. The exhaust gas reaches the passive NOx adsorber 2 via the exhaust pipe 1. The passive NOx adsorber 2 is designed to adsorb NOx emissions contained in the exhaust gas. When the storage capacity of the passive NOx adsorber 2 is exhausted and / or a sufficiently high temperature is reached, the NOx emissions are desorbed. An injector 3 and a mixer 4 are arranged in the exhaust pipe 1 between the passive NO...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an exhaust after treatment system with a passive NOx adsorber and a heatable SCR catalytic converter. The exhaust gas after treatment system according to the invention for an internal combustion engine comprises an exhaust pipe, a passive NOx adsorber arranged in the exhaust pipe, an injector arranged in the exhaust pipe, a mixer arranged in the exhaust pipe, an SCR catalytic converter arranged in the exhaust pipe and a heating device arranged in the exhaust pipe, wherein the heating device is set up in such a way that at exhaust gas temperatures below a start-up temperature of the SCR catalytic converter, the temperature in the SCR catalytic converter can be brought to a temperature above the start-up temperature within a period of time by means of the heating device.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority of German Patent Application No. DE 102018129683.5 filed Nov. 26, 2019.FIELD OF THE INVENTION[0002]The disclosure relates to an exhaust after treatment system with a passive NOx adsorber and a heatable SCR catalytic converter.BACKGROUND OF THE INVENTION[0003]An exhaust after treatment system for an internal combustion engine is known from U.S. Pat. No. 8,661,790B2 that includes an exhaust pipe, an upstream SCR catalytic converter, an electrically heated catalytic converter, a downstream SCR catalytic converter and a control unit. The oxidation catalytic converter can be heated by the electrically heated catalytic converter. A NOx adsorber for adsorbing NOx emissions below a temperature threshold and for desorbing NOx emissions above a temperature threshold is arranged in the electrically heated catalytic converter and / or the oxidation catalytic converter. The electrically heated catalytic converter is swit...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/20F01N3/08
CPCF01N3/208F01N3/0814F01N3/2006F01N3/0842F01N3/0885F01N3/2013F01N3/2066F01N9/00F01N2610/02F01N2610/1453F01N3/0807F01N3/2892F01N2900/1602F01N13/009Y02T10/12Y02T10/40
Inventor WITTKA, THOMAS
Owner FEV EURO GMBH