Invention Grant
- Patent Title: Adjustment of ignition timing at cut out
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Application No.: US15028223Application Date: 2014-09-22
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Publication No.: US09938955B2Publication Date: 2018-04-10
- Inventor: Johan Assargård , Ricky Sundkvist , Stefan Wixe , Martin Axelsson
- Applicant: HUSQVARNA AB
- Applicant Address: SE Huskvarna
- Assignee: HUSQVARNA AB
- Current Assignee: HUSQVARNA AB
- Current Assignee Address: SE Huskvarna
- Agency: McNair Law Firm, P.A.
- Priority: SE1351196 20131009
- International Application: PCT/SE2014/051084 WO 20140922
- International Announcement: WO2016/048199 WO 20150331
- Main IPC: F02P9/00
- IPC: F02P9/00 ; F02P5/145 ; F02P5/15 ; F02B25/00 ; F02B63/02 ; F02D41/14 ; F02D41/22 ; F02B25/16 ; F02M17/04 ; F02B75/02

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. The electronic control unit (100) is further configured to apply a changed ignition angle (330) relative to the operating band (320) for first at least one spark initiated after the speed limitation operation.
Public/Granted literature
- US20160237977A1 ADJUSTMENT OF IGNITION TIMING AT CUT OUT Public/Granted day:2016-08-18
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