Temperature responsive open/closed loop switching for lambda control

US4392470A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Gunther · Steinheim an der Murr, DE
• Richard Bertsch · Asperg, DE
• Siegfried Bottcher · Waiblingen, DE
• Herbert Arnold · Eberdingen, DE
• Hans Schnurle · Walheim, DE
• Michael Horbelt · Schwieberdingen, DE

Key dates

• Filing date: Jun 24, 1981
• Grant date: Jul 12, 1983
• Expiry date: Jun 24, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/1488
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A regulating device is described for regulating or adjusting the composition of the operating mixture of an internal combustion engine. When the engine or exhaust gas probe is still cold, the composition of the fuel-air mixture is controlled in an open-loop manner, and upon the attainment of a minimum operating temperature, the closed-loop regulating device for influencing the fuel-air mixture is activated. The activation of the regulating device is effected, when the engine is being operated under a load, after the attainment of a first, low temperature value; during engine idling, this is effected after the attainment of a second, higher temperature value. Via the throttle valve, a switchover is effected between two threshold values of a threshold switch.