Adaptive closed-loop knock control for a turbocharged engine

US5231830A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Robert Entenmann · Memmingen, DE
• Bernhard Stengel · Tamm, DE
• Stefan Unland · Schwieberdingen, DE
• Matthias Philipp · Stuttgart, DE
• Oskar Torno · Schwieberdingen, DE
• Ulrich Rothhaar · Milano, IT
• Siegfried Rohde · Schwieberdingen, DE

Key dates

• Filing date: Sep 5, 1991
• Grant date: Aug 3, 1993
• Expiry date: Sep 5, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The method for closed-loop knock control of a internal combustion engine, includes retarding the ignition angle when at least one cylinder knocks and then resetting the ignition angle at a later time. For internal combustion engines with a turbocharger, the method also includes reducing the boost pressure when an ignition-angle limiting value dependent on an exhaust gas temperature is reached, and then increasing the boost pressure again as soon as the ignition-angle limiting value is again crossed due to resetting of the ignition angle. The ignition angle and boost pressure values established are stored as a function of the respective operating condition of the internal combustion engine for adaptive process control and used as starting values when the same engine operating conditions are again reached.