Method for protecting a catalytic converter

US5249562A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Klenk · Munich, DE
• Winfried Moser · Ludwigsburg, DE
• Anton Kantschar · Lambach, DE

Key dates

• Filing date: Jul 6, 1992
• Grant date: Oct 5, 1993
• Expiry date: Jul 6, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/1497
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for protecting a catalytic converter from overheating, a conventional misfire recognition method is used to determine whether misfires are occurring in a cylinder. If this is the case, an attempt is made to interrupt the fuel supply to the affected cylinder. If this succeeds, the remaining cylinders are supplied with a lean mixture. If it does not succeed, all the cylinders are operated with a rich mixture. The lean setting of the mixture in the case of interrupted fuel supply to the affected cylinder has the effect that after the combustions in the cylinders, no further fuel reaches the catalytic converter which could combust in the catalytic converter with the oxygen induced by the affected cylinder.