Method and apparatus for exhaust gas posttreatment in internal combustion engines

US6647712B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Burkhard Hiller · Oberriexingen, DE
• Andreas Glenz · Weingarten, DE

Key dates

• Filing date: Jul 12, 2002
• Grant date: Nov 18, 2003
• Expiry date: Jul 12, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method and an apparatus for posttreatment of exhaust gases of internal combustion engines after an engine operation includes an intake system and an exhaust gas treatment system with an exhaust gas catalytic converter. Secondary air that originates in an air source can be delivered to the exhaust gas treatment system at a first secondary air inlet. After an engine operation, with the exhaust gas catalytic converter at operating temperature, the throttle device in the intake system is closed. After the engine operation, the engine is shut off in a phase relationship in which inlet/outlet valves of at least one combustion chamber of the engine are open. By means of the air source, an air flow is generated, which discharges at a further inlet point in the intake system of the engine and flows through or bathes the components in the direction of the exhaust gas catalytic converter at operating temperature in the exhaust gas treatment system.