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Method for operating a handheld work apparatus having a combustion engine

一种工作器械、内燃机的技术，应用在手持式工作器械领域，能够解决离合器损坏、内燃机转速下降等问题

Active Publication Date: 2015-06-24
ANDREAS STIHL AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the engine speed to drop down to the engagement speed range
In the engagement speed range, the clutch can be damaged with the tool stationary

Method used

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  • Method for operating a handheld work apparatus having a combustion engine
  • Method for operating a handheld work apparatus having a combustion engine
  • Method for operating a handheld work apparatus having a combustion engine

Examples

Experimental program
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Embodiment Construction

[0028] figure 1 A power saw 1 is shown schematically as an example for a hand-held power tool. However, the invention can also be provided in other hand-held working implements (for example cutters, rock cutters, hedge shears, etc.). The power saw 1 has a housing 2 , a rear handle 3 and a grip tube 4 . A guide rail 6 is fastened to the housing 2 , on which a saw chain 7 is arranged circumferentially. Arranged on the side of the grip tube 4 facing the guide rail 6 is a hand guard 5 which at the same time can be used to activate a chain brake (not shown).

[0029] An internal combustion engine 8 arranged in the housing 2 serves to drive the saw chain 7 . The internal combustion engine 8 is a single-cylinder engine, advantageously a mixed-lubrication engine, such as a two-stroke engine or a mixed-lubrication four-stroke engine. The internal combustion engine 8 draws in combustion air via an air filter 28 and a carburetor 9 . Instead of the carburetor 9 , a fuel valve can als...

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PUM

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Abstract

A handheld work apparatus has a combustion engine which drives a tool of the work apparatus via a centrifugal clutch. The centrifugal clutch couples in an engagement rotational speed range (nK) which extends between a lower engagement rotational speed (nu) and an upper engagement rotational speed (no). The engine has a fuel supply device, an ignition device, a control device and a device for detecting the rotational speed (n) of the engine. A method for operating the handheld work apparatus makes provision for the rotational speed profile of the combustion engine to be monitored in the engagement rotational speed range (nK) and for the power (P) output for driving the tool to be increased from an operating power (P1) to an increased power (P2, P3) when the rotational speed profile corresponds with a predetermined rotational speed profile over a predetermined period of time (Δt).

Description

technical field [0001] The invention relates to a method for operating a hand-held power tool with an internal combustion engine of the type specified in the preamble of claim 1 . Background technique [0002] A method for operating a hand-held power tool with an internal combustion engine is known from DE 10 2011 103 125 A1. The internal combustion engine drives the tool via a clutch. The clutch is engaged in the rotational speed range between the lower and upper engagement speeds (Einkuppeldrehzahl). [0003] During operation of such hand-held power tools, it can happen that the tool freezes under full load, for example if the teeth of the saw chain get caught in the material to be cut and become jammed. This causes the internal combustion engine speed to drop into the engagement speed range. In the engagement speed range, the clutch can be damaged when the tool is stationary. In order to avoid damage to the clutch, DE 43 26 010 A1 provides for reducing the rotational ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00F02D41/22
CPCF02D41/022F02D41/30F02P5/045F02P5/1504F02D37/02F02D41/0002F02D2200/021F02D2200/1006F02D2200/101F02D2250/18F02D2400/06F02M1/02F02D41/1497B27B17/08B27B17/00F02D29/00B25F5/00
Inventor E.戈伦弗洛K-M.尤尔G.迈尔
Owner ANDREAS STIHL AG & CO KG
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