Patent · US Active

Working apparatus and a method for operating same

US9109569B2 · kind B2 · utility

2Cited by

8References

16Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Niels Kunert · Sindelfingen, DE
Jürgen Aupperle · Winnenden, DE
Michael Grether · Waiblingen, DE

Key dates

Filing date	May 18, 2012
Grant date	Aug 18, 2015
Priority date	—
Expiry date	May 11, 2034

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A working apparatus has an internal combustion engine which drives at least one tool via a clutch. The clutch starts the coupling process at an initial engagement speed when the internal combustion engine is accelerated. The internal combustion engine has a piston, an ignition device and an ignition timing control device. The control device provides a first ignition timing for idling and a second ignition timing for full load operation, which is earlier than the first ignition timing. A method for operating the working apparatus provides that the ignition timing is adjusted toward “late,” with respect to the first ignition timing, when the engine speed drops in a first speed range above the idling speed and below the initial engagement speed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.