Metering unit for introducing a reducing agent into an exhaust pipe upstream of a selective catalytic reduction catalyst includes a pressure sensor equipped with a frost compensator

• Main Authors: SCHLEHNER, ACHIM, BECK, GERHARD
• Format: Patent
• Language: English; German
• Published: 19.05.2005
• Edition: 7
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WEAPONS

Metering unit for introducing a reducing agent into an exhaust pipe upstream of a selective catalytic reduction (SRC) catalyst comprises a pressure sensor (2) equipped with a frost compensator (3), a reducing agent channel (5), a temperature sensor (7) and a metering valve (8). Die Erfindung betrifft eine Dosiereinheit (1) zum Zumessen eines Reduktionsmittels in die Abgasleitung stromaufwärts eines SCR-Katalysators, welche einen Drucksensor (2) zur Messung des Druckes im Dosiersystem, einen Reduktionsmittelkanal (5), einen Temperatursensor (7) zur Messung der Reduktionsmitteltemperatur und ein Dosierventil (8) zur Dosierung des Reduktionsmittels umfasst. Der Drucksensor (2) ist erfindungsgemäß mit einem Ausgleichselement (3) zur Frostkompensation ausgestattet.