Method and apparatus for fuel-air mixture control

US4304204A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Otto Glockler · Renningen, DE
• Bernd Kraus · Gerlingen, DE

Key dates

• Filing date: Jun 8, 1977
• Grant date: Dec 8, 1981
• Expiry date: Jun 8, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/1443
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The fuel-air mixture preparation system of an internal combustion engine is engaged by signals from a plurality of oxygen sensors located in the exhaust system of the engine. More than one sensor is provided to improve the quality of the output signals in unfavorable engine operation. The individual sensors are provided with comparators which make a comparison between the sensor output and a set-point signal. The output signals from the comparators are fed to a logically controlled coupling circuit which presents them in cyclic alternation to an integrating control circuit which provides a control signal to the final control element in the fuel mixture preparation system for changing the fuel-air ratio. The coupling circuit may also provide a signal based on the logical states of the individual sensor signals.