Invention Grant
- Patent Title: Method for switching off a rotational speed limit in an internal combustion engine
- Patent Title (中): 用于切断内燃机的转速极限的方法
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Application No.: US13956088Application Date: 2013-07-31
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Publication No.: US09322329B2Publication Date: 2016-04-26
- Inventor: Tim Gegg , Armin Koelmel , Manuel Dangelmaier
- Applicant: Andreas Stihl AG & Co. KG
- Applicant Address: DE Waiblingen
- Assignee: Andreas Stihl AG & Co. KG
- Current Assignee: Andreas Stihl AG & Co. KG
- Current Assignee Address: DE Waiblingen
- Agency: Walter Ottesen, P.A.
- Priority: DE102012015034 20120731
- Main IPC: F02B63/02
- IPC: F02B63/02 ; F02D31/00

Abstract:
A method controls the rpm of a combustion engine in a hand-held work apparatus such as a brushcutter. The engine drives a work tool via a clutch which engages as a function of the engine rpm (n). A spark plug is arranged in the combustion chamber and is driven by an ignition unit. During start of the engine, an rpm lock circuit is active and defines a control variable as a function of the instantaneous rpm (nact) of the engine. According to the magnitude of this control variable, operating parameters of the engine are adapted to change the instantaneous rpm (nact). A control variable is determined for the adaptation of the operating parameters by the rpm lock circuit. The switch-off of the rpm lock circuit is provided when the control variable of the control lies outside a predetermined bandwidth of the absolute magnitude of the control variables.
Public/Granted literature
- US20140034011A1 METHOD FOR SWITCHING OFF A ROTATIONAL SPEED LIMIT IN AN INTERNAL COMBUSTION ENGINE Public/Granted day:2014-02-06
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