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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10436135 B1

PDFFull Text
Date of Patent:
Oct. 08, 2019

Filed:

Dec. 07, 2015

Hand-held power tool, related control system and its use, and method of controlling said tool

Applicant:

Husqvarna Ab, Huskvarna, SE;

Inventors:

Mikael Larsson, Jönköping, SE;

Henrik Eklund, Tenhult, SE;

Assignee:

HUSQVARNA AB, Huskvarna, SE;

Attorney:

Burr & Forman LLP

Primary Examiner:

Michelle Lopez

Int. Cl.
CPC ...
B27B 17/10 (2006.01); F02D 41/06 (2006.01); B23D 59/00 (2006.01); B27B 17/08 (2006.01); F02P 11/00 (2006.01); F02D 31/00 (2006.01); F02D 41/02 (2006.01); F02D 41/08 (2006.01); F02P 5/15 (2006.01); B25F 5/00 (2006.01); F02B 63/02 (2006.01); F02D 41/00 (2006.01); F02D 41/26 (2006.01); F02N 3/02 (2006.01); F02N 11/00 (2006.01);
U.S. Cl.
CPC ...
F02D 41/062 (2013.01); B23D 59/001 (2013.01); B25F 5/001 (2013.01); B27B 17/08 (2013.01); B27B 17/10 (2013.01); F02B 63/02 (2013.01); F02D 31/001 (2013.01); F02D 31/006 (2013.01); F02D 31/009 (2013.01); F02D 41/0097 (2013.01); F02D 41/022 (2013.01); F02D 41/08 (2013.01); F02D 41/26 (2013.01); F02P 5/1506 (2013.01); F02P 11/00 (2013.01); F02D 2200/101 (2013.01); F02N 3/02 (2013.01); F02N 11/00 (2013.01); Y02T 10/46 (2013.01);
Abstract

Herein a hand-held power tool comprising an internal combustion engine () is disclosed. The hand-held power tool comprises, a working tool (), a centrifugal clutch (), and a control system (). The internal combustion engine () has a clutch-in speed (ωC) above which the internal combustion engine () drives the working tool (). A speed limitation controller (), is configured to limit an engine speed at a limitation speed below the clutch-in speed (ωC). The control system () is configured to calculate an integral of the rotational speed of the internal combustion engine (), and to deactivate the speed limitation controller () after the integral reaches an integration limit value, such that the internal combustion engine () is rotatable above the limitation speed (ωL) to drive the working tool () via the centrifugal clutch ().

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