Invention Grant
- Patent Title: Hand-held power tool and thereto related control system and use and method of controlling
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Application No.: US15781865Application Date: 2015-12-07
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Publication No.: US10914245B2Publication Date: 2021-02-09
- Inventor: Mikael Larsson , Henrik Eklund
- Applicant: HUSQVARNA AB
- Applicant Address: SE Huskvarna
- Assignee: HUSQVARNA AB
- Current Assignee: HUSQVARNA AB
- Current Assignee Address: SE Huskvarna
- Agency: Burr & Forman, LLP
- International Application: PCT/EP2015/078860 WO 20151207
- International Announcement: WO2017/097331 WO 20170615
- Main IPC: F02D31/00
- IPC: F02D31/00 ; B25F5/00 ; F02B63/02 ; F02D41/04 ; F02D41/06 ; F02P11/00 ; F02P5/15 ; F02N11/00 ; F02N3/02 ; B23D59/00 ; B27B17/10

Abstract:
A hand-held power tool comprising an internal combustion engine (4), a working tool (6), a centrifugal clutch (8), and a control system (10) is disclosed. The engine (4) has a clutch-in speed, above which the engine (4) drives the working tool (6). The control system (10) comprises a rotation speed sensor (12), and a speed limitation controller (14), which is configured to limit an engine speed at a limitation speed below the clutch-in speed. It is active or activated during a starting procedure of the internal combustion engine (4). The control system (10) is configured to deactivate the speed limitation controller (14) upon sensing at least one acceleration at a level above the limitation speed and sensing at least one deceleration at a level above the limitation speed, such that the engine (4) is rotatable above the limitation speed to drive the working tool (6).
Public/Granted literature
- US20180363571A1 HAND-HELD POWER TOOL AND THERETO RELATED CONTROL SYSTEM AND USE AND METHOD OF CONTROLLING Public/Granted day:2018-12-20
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