Method and arrangement for the idle closed-loop control of an internal combustion engine

US5199400A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Otto Sprenger · Kornwestheim, DE
• Klaus Heck · Hohenacker, DE
• Manfred Mezger · Markgröningen, DE
• Stefan Huwig · Tamm, DE

Key dates

• Filing date: Nov 22, 1991
• Grant date: Apr 6, 1993
• Expiry date: Nov 22, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D31/004
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A temperature-dependent base desired value for the opening angle is determined in a method for precontrolling the opening angle of a throttle flap during the idle engine-speed control of an internal combustion engine. This temperature-dependent base desired value is then modified within a start-time duration. The modification takes place in that, during start, a temperature-dependent angle increase is determined which is multiplied by a time-reduced multiplier factor and the product is additively superposed on the base desired value. With this procedure, and notwithstanding the simple method sequence, it is ensured that the start phase of a warm internal combustion engine takes place without engine-speed increases. It is especially advantageous to modify additional engine-speed base desired values in a corresponding manner. In this case, hardly any additional measures must be undertaken which go beyond those which must be undertaken to modify the base desired value for the opening angle of the throttle flap. For cold starts, an increase of the engine speed is obtained in the start phase without the danger being present that the increase takes place for warm engines.