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1. (WO2001006098) DEVICE AND METHOD FOR AFTERTREATING THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE BY MEANS OF SELECTIVE CATALYTIC REDUCTION

Pub. No.:    WO/2001/006098    International Application No.:    PCT/DE2000/002118
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Fri Jun 30 01:59:59 CEST 2000
IPC: B01D 53/94
F01N 3/20
F01N 9/00
G01L 9/00
G01L 19/04
Applicants: SIEMENS AKTIENGESELLSCHAFT
WEIGL, Manfred
Inventors: WEIGL, Manfred
Title: DEVICE AND METHOD FOR AFTERTREATING THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE BY MEANS OF SELECTIVE CATALYTIC REDUCTION
Abstract:
In order to prevent the liquid reduction agent in an SCR method for an internal combustion engine (1) from freezing, additional electric heating resistances are applied to the pressure sensor diaphragm of the pressure sensor (18), present in the metering system, using the same technology that is used for the production of the sensor resistance network. The use of the sensor diaphragm surface to electrically heat the aqueous urea solution eliminates the additional need for installation space, sealed areas and connectors for the electric supply or triggering mechanism.