Device for producing a desired value of a control parameter of an internal combustion engine

US5261378A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Reinhard Fenchel · Hamm (Sieg), DE
• Hermann Kull · Stuttgart, DE
• Dieter Seher · Ilsfeld, DE
• Gerhard Engel · Stuttgart, DE
• Manfred Birk · Oberriexingen, DE

Key dates

• Filing date: Nov 4, 1992
• Grant date: Nov 16, 1993
• Expiry date: Nov 4, 2012

Classification

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

Abstract

In a device for adjusting the injection timing in a diesel engine fitted with EDC, a basic value (SBGWs) of injection timing for operation in the static or steady state is stored in a first characteristic field (20) and a basic value (SBGWd) for operation in the dynamic or unsteady state such as acceleration and deceleration is stored in a second characteristic field (22). These basic values are dependent on desired injected fuel quantity (Q) and engine speed (n). The characteristic field (20) for the static state is designed empirically or otherwise to optimize fuel consumption whereas the characteristic field (22) for the dynamic state is designed for minimum pollutant emission. A gradual changeover from one mode to the other is achieved by the gradual change of a multiplying factor (c) from 0 to 1 or vice versa responsively to dQ/dt departing significantly from zero or becoming zero.