Patents by Inventor Stefan Wixe

Stefan Wixe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Adjustment of ignition timing at cut out
    Patent number: 9938955
    Abstract: An internal combustion engine (1) may include a combustion chamber (41) into which a mixture (40) of fuel and air is supplied, a spark plug (50) disposed proximate to the combustion chamber (41) to ignite the mixture (40) by generating a spark such that ignition of the mixture drives a piston (6) operably coupled to a crank portion (12) of the engine (1), a speed sensor (102) configured to determine engine speed, and an electronic control unit (100) configured to control operation of the spark plug (50). The electronic control unit (100) 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 (320) of ignition angles prior to engine speed reaching the cut out speed threshold. The speed limitation operation may include skipping application of sparks.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: April 10, 2018
    Assignee: HUSQVARNA AB
    Inventors: Johan Assargård, Ricky Sundkvist, Stefan Wixe, Martin Axelsson
  • Method for optimizing A/F ratio during acceleration and a hand held machine
    Patent number: 9797326
    Abstract: 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.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: October 24, 2017
    Assignee: HUSQVARNA AB
    Inventors: Stefan Wixe, Martin Axelsson, Björn Lundblad
  • METHOD FOR OPTIMIZING A/F RATIO DURING ACCELERATION AND A HAND HELD MACHINE
    Publication number: 20170016408
    Abstract: 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.
    Type: Application
    Filed: March 13, 2015
    Publication date: January 19, 2017
    Inventors: Stefan Wixe, Martin Axelsson, Björn Lundblad
  • ADJUSTMENT OF IGNITION TIMING AT CUT OUT
    Publication number: 20160237977
    Abstract: An internal combustion engine (1) may include a combustion chamber (41) into which a mixture (40) of fuel and air is supplied, a spark plug (50) disposed proximate to the combustion chamber (41) to ignite the mixture (40) by generating a spark such that ignition of the mixture drives a piston (6) operably coupled to a crank portion (12) of the engine (1), a speed sensor (102) configured to determine engine speed, and an electronic control unit (100) configured to control operation of the spark plug (50). The electronic control unit (100) 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 (320) of ignition angles prior to engine speed reaching the cut out speed threshold. The speed limitation operation may include skipping application of sparks.
    Type: Application
    Filed: September 22, 2014
    Publication date: August 18, 2016
    Inventors: Johan Assargård, Ricky Sundkvist, Stefan Wixe, Martin Axelsson