Exhaust line of an exhaust system equipped with a catalytic converter for an internal combustion engine

US6284332A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Ulrich Buettner · Senden, DE
• Marin Hartweg · Erbach, DE
• Herbert Klein · Kiel, DE
• Martin Matt · Weingarten, DE
• Wolfram Muench · Mannheim, DE
• Karl-Heinz Thiemann · Bad Marienberg, DE
• Reinhard Zachai · Sehnde, DE

Key dates

• Filing date: Sep 4, 1998
• Grant date: Sep 4, 2001
• Expiry date: Sep 4, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1393
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An exhaust line for an exhaust system of an internal combustion engine having a catalytic converter, the exhaust line being located upstream of the catalytic converter with respect to the flow direction of exhaust. The exhaust line has an externally applied heat-conducting layer preferably made of a metallic material and an internally disposed insulating layer made of a heat-insulating material. The insulating layer and the heat-conducting layer are connected directly and forcewise with one another. The layer thickness of the insulating layer is less than 2 mm, the specific heat capacity c of the insulating layer is less than 10.sup.6 J/(m.sup.3 h), and the heat diffusivity .kappa. of the insulating layer is less than 0.01 cm.sup.2 /s.