Method for reversing the direction of rotation of a two-stroke engine

US7171925B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Reinhard Beil · Schwalbach, DE
• Thomas Herm · Bärnau, DE
• Frank Kutzner · Schongau, DE

Key dates

• Filing date: Jan 8, 2003
• Grant date: Feb 6, 2007
• Expiry date: Jan 8, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P7/07
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for reversing the direction of rotation of a two-stroke engine whose rotational speed and crank mechanism position are sensed by a sensor system. To reverse the direction of rotation of the engine, the ignition and/or the fuel supply is first switched off, and upon a subsequent coasting of the engine, a targeted early ignition is set when a specific limiting rotational speed is undershot and after, if appropriate, the fuel supply has been resumed. Early ignition reverses the direction of rotation of the engine, and the fuel supply and ignition are subsequently controlled in accordance with the reversed direction of rotation. A single sensor interacts with an incremental transducer having a specific number of transducer segments distributed uniformly over a circumference to determine the instantaneous angular speed of the crank mechanism and the crank mechanism position.