Direct fuel injection method for a diesel engine

US4836161A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Jorg Abthoff · Plüderhausen, DE
• Manfred Fortnagel · Bad Marienberg, DE
• Ludwig Fricker · Stuttgart, DE
• Immanuel Kutschera · Stuttgart, DE
• Michael Kramer · Glen Ridge, US
• Michael Kuhn · Knoxville, US

Key dates

• Filing date: Oct 8, 1987
• Grant date: Jun 6, 1989
• Expiry date: Oct 8, 2007

Classification

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

Abstract

The invention relates to a direct fuel injection method for a diesel engine in which a preset quantity of fuel is introduced into a combustion space via a fuel injection nozzle in a preinjection and in a main injection which is separate from the preinjection. To achieve a short ignition delay with lowest possible specific fuel consumption during this process, the beginning of the preinjection occurs within the range of 10.degree.-16.degree. or of 20.degree.-30.degree. crank angle before top dead center, depending on speed, and the beginning of the main injection occurs within the range of 2.degree. after top dead center to 15.degree. before top dead center, the interval between the end of the preinjection and the beginning of the main injection being within the range of 3.degree. to 14.degree. or of 3.degree. to 26.degree. crank angle before top dead center and the preinjection quantity is 10% to 20% or 1% to 5% of the quantity of fuel preset in each case, depending on load.