Method for adapting the composition of a mixture of fuel and combustion air

US10330038B2 · kind B2 · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Andreas Baehner · Gronau, DE
• Michael Dietenberger · Waiblingen, DE
• Martin Kiesner · Waiblingen, DE
• Florian Hoche · Waiblingen, DE
• Klaus Geyer · Pocking, DE
• Steffen Bantle · Bad Marienberg, DE
• Friedrich Hollmeier · Welzheim, DE
• Frederik Herrmann · Waiblingen, DE
• Jochen Gantert · Waiblingen, DE
• Karsten Schmidt · San Diego, US

Key dates

• Filing date: Feb 1, 2018
• Grant date: Jun 25, 2019
• Expiry date: Feb 1, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2400/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for adapting the composition of a mixture of fuel and combustion air. The mixture is supplied to a combustion chamber of a mixture-lubricated combustion engine in a work apparatus. The fuel is supplied to the combustion engine via a controlled fuel valve. In an operating state (I) of the combustion engine, the quantity of fuel is metered by the fuel valve. For the purpose of adapting the composition of the mixture, the combustion engine is shifted into a special operating state (II) which differs from the normal operating state (I). After starting, the combustion engine is operated in a first rotational speed range (B) for a prespecified operating time (Tmin), wherein, after the prespecified operating time (Tmin) has elapsed, the operating state (II) for adapting the composition of the mixture is initiated by a prespecified user action.