Apparatus for regulating the idling rpm in an internal combustion engine

US4513712A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hermann Gassler · Lambach, DE
• Wolfgang Kosak · Asperg, DE

Key dates

• Filing date: May 31, 1984
• Grant date: Apr 30, 1985
• Expiry date: May 31, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B1/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An apparatus is proposed for regulating the idling rpm in an internal combustion engine. The apparatus has a PI regulator which has an insensitivity control circuit associated with it. Minimum and maximum value limiting circuits are furthermore provided, their thresholds being dependent on operating characteristics. Finally, a D element circuit cooperates with the PI regulator. The D element is subject to a threshold, and it comes into effect only when the rpm is dropping, its function being such as to steepen the I component of the PI regulator.