Husqvarna Ab

Stefan Wixe

Martin Axelsson

Björn Lundblad

Ricky Sundkvist

Johan Assargård

An internal combustion engine () may include a combustion chamber () into which a mixture () of fuel and air is supplied, a spark plug () disposed proximate to the combustion chamber () to ignite the mixture () by generating a spark such that ignition of the mixture drives a piston () operably coupled to a crank portion () of the engine (), a speed sensor () configured to determine engine speed, and an electronic control unit () configured to control operation of the spark plug (). The electronic control unit () may be configured to initiate a speed limitation operation in response to engine speed reaching a cut out speed threshold and to control ignition timing within an operating band () of ignition angles prior to engine speed reaching the cut out speed threshold. The speed limitation operation may include skipping application of sparks. The electronic control unit () is further configured to apply a changed ignition angle () relative to the operating band () for first at least one spark initiated after the speed limitation operation.

Adjustment of ignition timing at cut out

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.

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Huskvarna, Sweden

Stefan Wixe