Husqvarna Ab

Björn Lundblad

Martin Axelsson

Mikael Larsson

Henrik Eklund

Johan Assargård

Stefan Wixe

An internal combustion engine for driving a working assembly with a clutch, including a combustion chamber into which a mixture of fuel and air is supplied, a spark plug to ignite the mixture, ignition of the mixture driving a piston operably coupled to a crank portion of the engine, a fuel supply system including a fuel valve and a throttle valve, a throttle position sensor configured to determine a position of the throttle valve, a speed sensor configured to determine engine speed, and an electronic control unit configured to control operation of the fuel valve and the spark plug, the electronic control unit being configured to initiate a speed limitation operation in response to a first position of the throttle valve at engine start-up, wherein the speed limitation operation continues until the throttle valve is moved from its first position.

Assembly and method for safe starting of an internal combustion engine

Method for optimizing the current A/F settings when accelerating the engine over at least one defined speed interval, the method comprising comparing at least two acceleration times of different A/F ratio that each encompasses at least one defined speed interval. Adjusting the A/F ratio based on the comparison.

Method for optimizing A/F ratio during acceleration and a hand held machine

Arrangement and methods for communicating data between a control system () of a power tool () and a computing device (). The arrangement () comprises a control system () with a plurality of electronic control units, ECUs (), a computing device (), and a connecting unit () comprising a data connection (). The plurality of ECUs () are connected to a common bus of the control system (). Each of the plurality of ECUs () has a passive service mode () and an active service mode (). The computing device is operable of transmitting a wake-up communication signal to the plurality of ECUs (), which wake-up communication signal comprises an ID of a selected ECU () out of the plurality of ECUs (). The selected ECU () is operable to switch from the passive service mode () to the active service mode () as a response to detecting its ID in the wake-up communication signal, so as to allow communication of data between the selected ECU () and the computing device () via the data connection.

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Jönköping, Sweden

Björn Lundblad