Method and apparatus for regulating a combustible mixture

US4210106A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolf Wessel · Oberriexingen, DE
• Wilfried Sautter

Key dates

• Filing date: May 30, 1978
• Grant date: Jul 1, 1980
• Expiry date: May 30, 1998

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/1482
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel metering control loop which includes an exhaust gas sensor and an integrating controller. In order to operate the system at an air number which may differ from the most stable operating point of the oxygen sensor, the output signal from the controller is deliberately changed so as to override the command signals from the oxygen sensor. In particular, the output signal undergoes a step-change toward a higher or lower value at the times of reversal of sensor potential. Thus, the average value of the air number which the controller effectively maintains is different from the nominal value which would be obtained with direct sensor control. In another embodiment, the ongoing integration process is continued for some time beyond the sensor signal reversal.