System for damping bucking oscillations of an automobile engine

US4527523A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rolf Daumer · Laichingen, DE
• Ekkehard Feldmann · Hemmingen, DE
• Martin Person · Oberriexingen, DE
• Ernst Wild · Oberriexingen, DE
• Martin Zechnall · Schwieberdingen, DE

Key dates

• Filing date: Oct 26, 1983
• Grant date: Jul 9, 1985
• Expiry date: Oct 26, 2003

Classification

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

Abstract

Fluctuations of engine speed in the frequency range from 2 to 8 Hz, which produce "bucking" behavior of a motor vehicle, are detected by passing engine speed signals through a filter which reduces and delays the oscillations and a difference signal is then produced between the original and the processed speed signal in order to derive an alternating signal in the form of a square wave indicating the sign of a correction to be made to engine ignition timing for counteracting the bucking oscillations of engine speed. The square wave determines the sign of an anti-bucking ignition timing correction factor, of which the absolute value may be constant or may vary according to the sign of the correction and, if desired, also in accordance with engine operation parameters.