Method for reducing the fuel supply for one engine cylinder

US5275143A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Manfred Lembke · Gerlingen, DE
• Alfred Kratt · Schwieberdingen, DE
• Anwar Abidin · Leonberg, DE

Key dates

• Filing date: Dec 9, 1991
• Grant date: Jan 4, 1994
• Expiry date: Dec 9, 2011

Classification

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

Abstract

In a method for reducing the fuel supply for one cylinder of a multi-cylinder internal combustion engine with centralized injection, the procedure is that the cylinder located in the intake cycle sequence in front of the cylinder whose mixture is to be made much leaner, for example because of unreliable combustion, is already supplied with less fuel than is the case when all cylinders are operable. In addition, the intake cycle for the failed cylinder itself is supplied with as little fuel as possible. Using this method, it is possible to set a very lean mixture in the failed cylinder but a mixture having a lambda value close to 1 in the remaining cylinders. This ensures that the motor vehicle in which the internal combustion engine with the failed cylinder is operating can still be reliably operated and, at the same time, there is no risk of overheating of the catalytic converter.