Method and system for reducing noxious components in the exhaust emission of internal combustion engine systems and particularly during the warm-up phase of the engine

US3949551A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Eichler · Munich, DE
• Walter Remmele
• Gunter Rosenzopf · Ludwigsburg, DE

Key dates

• Filing date: Mar 19, 1974
• Grant date: Apr 13, 1976
• Expiry date: Mar 19, 1994

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The exhaust system of the engine is provided with a reactor, for example a catalytic reactor; the air-fuel mixture normally fed to the engine is set to be on the lean range. During starting, the mixture is enriched for a predetermined time; the degree of enrichment is then decreased, in dependence on engine, or exhaust system temperature. After the engine, or the reactor has reached operating temperature, the composition of the mixture is controlled by operating parameters of the engine, or sensed exhaust gas composition.