Control process and apparatus, in particular lambda control

US5079691A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Heck · Hohenacker, DE
• Gunther Plapp · Echterdingen, DE
• Jurgen Kurle · Reutlingen, DE

Key dates

• Filing date: Jan 16, 1990
• Grant date: Jan 7, 1992
• Expiry date: Jan 16, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/2441
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for the adaptation of a precontrolled value for a feedback control is based on the realization that, whenever the operating conditions coincide with the calibration conditions for the initial determining of precontrolled values, no control-manipulated variable deviations may occur in all the operating ranges, and that accordingly deviations which are nevertheless observed are a sign that the calibration conditions no longer exist. This may be caused by aging effects or by uncompensated disturbances. The method establishes the differences in control-manipulated variable deviations over different classes of an influencing variable. For each influencing variable class, a correction value is then determined such that, by means of the correction value, the error previously observed for the respective range is compensated during operation of the controlled system. The method makes possible an accurate adaptation range by range in an off-line method and is therefore suitable in particular for the precontrolling feedback control of the lambda value of an internal combustion engine. An apparatus for carrying out the method is also disclosed.