Method for controlling the fuel supply for an internal combustion engine with a heatable catalytic converter

US5617720A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Erwin Achleitner · Obertraubling, DE
• Achim Koch · Tegernheim, DE

Key dates

• Filing date: Apr 30, 1996
• Grant date: Apr 8, 1997
• Expiry date: Apr 30, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An internal combustion engine is equipped with a lambda regulating device, a catalytic converter disposed in an exhaust pipe of the internal combustion engine, a device for externally heating the catalytic converter to its operating temperature, and a secondary-air pump which injects additional air into the exhaust pipe. A method for controlling the fuel supply for the internal combustion engine includes injecting an additional fuel quantity during operation of a burner and during secondary-air injection, for heating the catalytic converter, as a function of engine air mass flow and an additional secondary-air quantity which is injected into the exhaust system.