Method of injecting fuel for two-stroke engine and apparatus therefor

US4700668A · kind A · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Roland Schierling · Marbach am Neckar, DE
• Werner Geyer · Newton, US
• Michael Wissmann · Markgröningen, DE
• Hans Nickel · Cottenweiler, DE

Key dates

• Filing date: Jun 17, 1986
• Grant date: Oct 20, 1987
• Expiry date: Jun 17, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/025
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a method of fuel injection for two-stroke engines, especially for hand-operated tools such as motor-driven saws and the like. The fuel-injection pump is charged with pressure present in the crankcase thereby causing fuel to be pumped for injection and combustion in the engine. The injection operation is triggered and the onset of injection into the combustion chamber is effected when the crankcase pressure rises. The pressure conducted from the crankcase to the injection pump can be automatically regulated as a function of the rotational speed and/or load conditions of the engine.