Method and apparatus for controlling fuel management for an internal combustion engine

US4244340A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Harro Herth · Schwieberdingen, DE
• Hans Schnurle · Walheim, DE
• Ulrich Drews · Schwieberdingen, DE
• Erich Singer
• Bernd Kraus · Gerlingen, DE
• Peter Werner · Wiernsheim, DE

Key dates

• Filing date: Apr 12, 1978
• Grant date: Jan 13, 1981
• Expiry date: Apr 12, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A control circuit of a fuel management control system for internal combustion engines monitors the operation of an exhaust line sensor. When the oxygen sensor is perceived to be inoperative, for example, due to low ambient temperature, the previously closed loop control process governing the fuel management control signals is interrupted and a direct forward control process is substituted therefor. The reference voltage is changed during this time for eventual adaptation to the changeover to closed loop feedback control after the oxygen sensor again becomes operational.