EP1250493A1 - Appareil de travail guide manuellement a reglage automatique de la vitesse de rotation - Google Patents

Appareil de travail guide manuellement a reglage automatique de la vitesse de rotation

Info

Publication number
EP1250493A1
EP1250493A1 EP01903670A EP01903670A EP1250493A1 EP 1250493 A1 EP1250493 A1 EP 1250493A1 EP 01903670 A EP01903670 A EP 01903670A EP 01903670 A EP01903670 A EP 01903670A EP 1250493 A1 EP1250493 A1 EP 1250493A1
Authority
EP
European Patent Office
Prior art keywords
speed
safety
sensor
engine
hand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01903670A
Other languages
German (de)
English (en)
Other versions
EP1250493B1 (fr
Inventor
Michael Steffen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Construction Equipment AG
Original Assignee
Wacker Werke GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wacker Werke GmbH and Co KG filed Critical Wacker Werke GmbH and Co KG
Publication of EP1250493A1 publication Critical patent/EP1250493A1/fr
Application granted granted Critical
Publication of EP1250493B1 publication Critical patent/EP1250493B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/35—Hand-held or hand-guided tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B17/00—Engines characterised by means for effecting stratification of charge in cylinders

Definitions

  • the invention relates to a hand-held implement.
  • Such an implement such as. B. a vibratory rammer for soil compaction or a hammer, has a petrol engine for driving, but occasionally also a diesel or electric motor.
  • the engine is usually started by actuating the pull cable of a reversing starter. For this, the operator holds z. B. the tamper firmly with one hand while pulling the pull rope with the other hand. Since the engine's throttle must usually be set to full throttle to start, the engine immediately runs at a high speed, which is often even above the operating speed. This closes a centrifugal clutch which couples the engine to the ramming system, whereby the ramming system is put into operation.
  • a device for controlling the speed of an internal combustion engine in a work device that can be guided on a handle in which a detection device has a sensor system on the handle with which it can be recognized automatically. whether the implement is properly guided. If improper guidance is ascertained, the detection device only allows the engine speed to be set to a safety speed below an operating number of the internal combustion engine. The safety speed is below a switch-on speed at which z. B. engages a centrifugal clutch of a rammer.
  • the basic idea described in DE 198 34 443 is to be developed further by the present invention. The invention is therefore based on the object of specifying a hand-held implement in which dangerous working conditions are avoided by uncontrolled increases in engine speed and which enables convenient operation.
  • a sensor device for detecting the hands of an operator and generating a corresponding handle signal is provided in a guide handle of the implement. Furthermore, a safety controller is provided for evaluating the handle signal of the sensor device, recognizing a starting process of the engine and controlling a speed setting device, the speed setting being carried out according to the following rules:
  • a speed increase is only permitted up to a safety speed below the operating speed.
  • a speed setting device for controlling a speed setting device, the speed setting being carried out according to the following rules:
  • the second embodiment of the invention is based on the same principle as the first embodiment, but the sensor device on the guide handle has at least two sensor elements, each of which is assigned to one hand of the operator and generates a sensor signal when the associated hand is detected.
  • the sensor signals are evaluated, a starting process of the engine is recognized, and a speed setting device of the engine is controlled, the rules governing the control being modified somewhat compared to the first embodiment: when the engine is started, an increase in speed is also only permitted up to the safety speed. A speed increase beyond the safety speed off is only possible if both sensor signals are present, i.e. if the operator holds the guide handle with both hands. If only one sensor signal is present, there is no influence on the current speed, ie the previously set speed is maintained.
  • the speed can only be increased to the operating speed if the operator holds the handle with both hands. Otherwise the safety speed is maintained. However, if the engine is already at operating speed, it will be held even if the operator removes one hand from the guide handle and only guides the implement with the other hand. If both sensor signals are missing, the speed is limited to the safety speed.
  • Both embodiments of the invention have in common that the holding of the guide handle by the operator's hands is automatically recognized without the operator z. B. must be activated by pressing an additional safety or dead man's bracket. It only has to grip the handle in the usual way.
  • the engine speed is influenced without the operator operating the gas control lever of the engine
  • Pressure-sensitive, optical, capacitive or ultrasonic sensors are suitable as sensor elements.
  • the motor can be switched off by the safety controller when a predetermined period of time that can be detected by a switch-off timer has expired.
  • the switch-off timer is triggered in the absence of both sensor signals. In practice, this means that the implement switches itself off if the operator does not have his hands on the guide handle for the predetermined period. Thus, the operator does not have to worry about switching off the implement, and unnecessary and environmentally harmful idling of the implement is avoided.
  • the speed setting device is an ignition device of the engine, which at least has two maps.
  • a first map is provided for normal operation of the engine, in which the engine speed corresponds to a position of a gas control lever.
  • the safety controller then controls the ignition device by switching between the two maps.
  • Figure 1 shows schematically the structure of the circuit according to the invention in a working device according to the second embodiment of the invention.
  • Fig. 2 is a flowchart showing the rules of the safety control for the second embodiment of the invention.
  • the above-mentioned first embodiment of the invention represents a technically simpler variant. Its description will be made up at a later point in time on the basis of a comparison with the second embodiment. Therefore, the second embodiment of the invention is first explained with reference to the schematic illustration in FIG. 1 using the example of a vibration rammer for soil compaction.
  • the tamper is held and guided by the operator with both hands on a bow-shaped guide handle 1, for example.
  • the guide handle 1 is divided into a left grip area 2 for the left hand and a right grip area 3 for the right hand.
  • At least one sensor element is provided in each of the two grip areas 2, 3, which detects the presence of the associated hand.
  • Pressure-sensitive and optical sensors are particularly suitable as sensor elements, and capacitive or ultrasonic sensors are also possible.
  • a pressure-sensitive sensor detects the hand of the operator when it is at least on the guide handle 1.
  • suitable arrangement e.g. B. also from several sensors, it is possible to reliably detect that the hand not only abuts the guide handle 1, but also includes it with some force and thus holds it securely.
  • Optical sensors e.g. B. photocells or other light-sensitive elements, however, can also be used in such a way that an approximation of the hand of the operator is already detected. This may be more appropriate for certain purposes.
  • Each of the sensors generates a sensor signal, which is led to a safety controller 6 via lines 4, 5.
  • more than two sensor elements can be provided, possibly in more than two grip areas or zones of the guide handle 1.
  • the number of sensible sensor elements to be used also depends on whether the sensor elements are flat (pressure-sensitive sensors) or selective (photocells).
  • the safety controller 6 evaluates the sensor signals of the sensor elements. In addition, it is able to recognize the starting process of the engine. For this purpose, an additional sensor (not shown in FIG. 1) can be provided which detects an increase in engine speed from zero. As an alternative to this, an ignition device 7 of the engine can also be monitored, which also allows conclusions to be drawn about the engine speed based on the ignition times. The provision of energy in the ignition device 7 is also an indication that the engine has been started.
  • the safety controller 6 controls the ignition device 7 serving as the speed setting device in accordance with predetermined rules which are explained in more detail below.
  • the ignition device 7 is a generally known magnetic high-voltage capacitor ignition (MHKZ), which is statically attached to the motor housing and is excited by a two-pole magnet 8 cast in a fan wheel of the motor (not shown). From the energy thus obtained and the information about the period of the engine, the ignition device 7 determines the ignition timing of the Engine, which is stored in a map that defines the optimum ignition angle for each load of the engine, and generates an ignition spark on a spark plug 9. If the optimum engine speed is exceeded, the ignition device 7 shifts the ignition point in accordance with the map, which means that there is no further increase in speed. If the engine speed increases - e.g. B. due to decreasing load - still on, the ignition device 7 in addition to the late adjustment of ignition pulses until the engine is working again in the desired speed range.
  • MHKZ magnetic high-voltage capacitor ignition
  • a second control map is stored, which is activated with a corresponding control by the safety controller 6 via a control line 10 and limits the engine to a speed below the operating speed by advancing the control end.
  • This speed limit is independent of the position of a gas control lever with which the operator can influence the speed in the usual way.
  • the vibratory tamper is usually equipped with a centrifugal clutch, for which a certain switching speed is required to be switched on.
  • the usual operating speed for operating the rammer is typically 4500 min “1 above the switching speed, while an idling speed (eg 3000 min " 1 ) is below the switching speed.
  • the idling speed is referred to as the safety speed because there is no tamping movement that may endanger the operator or other people, and the device is therefore at rest, if you disregard the idling motor.
  • the energy generated by the magnetic excitation in the ignition device 7 is sufficient to also supply the safety controller 6 with energy as soon as the engine is running.
  • an energy line 11 from the ignition device 7 to the safety controller 6 is provided.
  • the speed is limited by the safety controller 6 by switching the maps stored in the ignition device 7, in a variant of the invention it is possible to influence the speed by means of a servo make that is coupled to the throttle control lever. In another variant of the invention, the position of the throttle in the carburetor can be changed to influence the speed.
  • the safety controller 6 is able to switch off the ignition device 7 via a switch-off line 12, so that the engine stops immediately. This can e.g. B. then be useful if the safety controller 6 over a longer period (z. B. 10 s) detects that no hand rests on the guide bracket 1.
  • step S1 When starting (step S1), the operator holds the tamper with one hand on the guide handle 1, while with the free hand he actuates a reversing starter (not shown in FIG. 1) until the tamper runs.
  • step S4 If it is determined in step S4 that the engine has not started or has been switched off again, the program flow stops. If, on the other hand, the engine is running at a safe speed, it is checked in step S5 whether a predetermined time period (tmax) has expired. For this purpose, the time is recorded by a switch-off timer triggered in step S2. When the specified time tmax is exceeded, the tamper is switched off.
  • tmax a predetermined time period
  • step S6 it is checked in step S6 based on the sensor signals whether the guide handle 1 is gripped with both hands. If this is not the case, the motor remains at the safety speed (step S3) and the elapsed time is checked again in step S5 without any further operation being carried out on the guide handle 1.
  • step S7 the safety controller 6 switches to the standard map in step S6 (step S7), so that the engine revs up to the operating speed specified by the gas control lever. This closes the centrifugal clutch and the ramming system works as requested by the operator. Because the operator is holding the tamper with both hands at this point, safe guidance is guaranteed.
  • the switch-off timer is triggered again in step S8, so that the time period to be measured begins again.
  • step S10 A query as to whether the tamper has been switched off takes place in step S9.
  • step S10 the sensor signals of the sensor elements are queried and evaluated, so that it can be determined whether the guide handle 1 is still held with both hands. If this is the case, the program loop continues with step S7 with the engine speed unchanged. The switch-off timer is triggered again in step S8.
  • step S10 If no two-handed guidance is determined in step S10, it is checked in step S11 whether there is one-handed guidance if there is only one sensor signal. If this is the case, it has no effect on the engine speed (step S7). The switch-off timer is then also repeatedly triggered again in step S8.
  • step S1 the program branches from step S1 to step S12, where the switch-off timer is triggered again and then a switchover to the second map takes place in step S3, whereby the engine speed is adjusted by changing the ignition timing and Omission of the ignition pulses decreases until the safety speed below the clutch speed of the centrifugal clutch drops.
  • step S3 the switch-off timer is triggered again and then a switchover to the second map takes place in step S3, whereby the engine speed is adjusted by changing the ignition timing and Omission of the ignition pulses decreases until the safety speed below the clutch speed of the centrifugal clutch drops.
  • step S6 If the operator now grips the guide handle 1 with only one hand, the engine speed does not change due to the decision in step S6.
  • the control map remains active because of step S3, and the tamper waits with the engine running, but without mechanical activity of the ramming system. stems.
  • step S6 Only when an ambidextrous grasping of both handle halves 2, 3 is detected in step S6 does the rammer resume its work immediately.
  • the control device detects a work break and switches the tamper off automatically.
  • the safety controller allows the speed to be increased beyond the safety speed. If the handle signal is no longer available, the engine speed is immediately limited to the safety speed. It is therefore only possible to crank the motor up if at least one hand rests on the guide handle 1.
  • the invention can be used not only very advantageously in the described video use rammers, but also with other motor-driven tools such as vibratory plates, rollers, hammers and chainsaws.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Road Paving Machines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Selon l'invention, sur une poignée de guidage (1) d'un appareil de travail entraîné par un moteur, deux éléments capteurs sont placés dans deux zones de poignée (2, 3) pour détecter les mains d'un utilisateur. Par l'intermédiaire d'une commande de sécurité (6) évaluant les signaux des capteurs, un dispositif d'allumage (7) du moteur est commandé de telle sorte qu'une élévation de la vitesse de rotation au-dessus d'une vitesse de rotation de sécurité n'est possible que lorsque la poignée de guidage (1) est tenue avec les deux mains. En l'absence des deux signaux de capteur, la vitesse de rotation du moteur est limitée à la vitesse de rotation de sécurité.
EP01903670A 2000-01-27 2001-01-23 Appareil de travail guide manuellement a reglage automatique de la vitesse de rotation Expired - Lifetime EP1250493B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10003486 2000-01-27
DE10003486A DE10003486C1 (de) 2000-01-27 2000-01-27 Handgeführtes Arbeitsgerät mit automatischer Drehzahleinstellung
PCT/EP2001/000712 WO2001055510A1 (fr) 2000-01-27 2001-01-23 Appareil de travail guide manuellement a reglage automatique de la vitesse de rotation

Publications (2)

Publication Number Publication Date
EP1250493A1 true EP1250493A1 (fr) 2002-10-23
EP1250493B1 EP1250493B1 (fr) 2004-05-26

Family

ID=7628880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01903670A Expired - Lifetime EP1250493B1 (fr) 2000-01-27 2001-01-23 Appareil de travail guide manuellement a reglage automatique de la vitesse de rotation

Country Status (5)

Country Link
US (1) US6651608B2 (fr)
EP (1) EP1250493B1 (fr)
JP (1) JP4555535B2 (fr)
DE (2) DE10003486C1 (fr)
WO (1) WO2001055510A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7795882B2 (en) 2004-02-17 2010-09-14 Gustav Magenwirth Gmbh & Co. Kg Operator sensing circuit for disabling motor of power equipment

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DE10219368A1 (de) * 2002-04-30 2003-11-20 Magenwirth Gmbh Co Gustav Totmannvorrichtung
DE10332823A1 (de) * 2003-07-18 2005-02-10 Gustav Magenwirth Gmbh & Co. Intelligente Betätigungsvorrichtung
US7497200B2 (en) * 2006-04-19 2009-03-03 Terrance Golden Continuous throttle regulation device
DE102007048980A1 (de) * 2007-10-12 2009-04-23 Wacker Construction Equipment Ag Bodenstampfvorrichtung mit adaptiver Antriebsregelung
DE102009054116B4 (de) * 2008-11-20 2014-10-23 Yamabiko Corporation Arbeitsgerät mit Verbrennungsmotor
CZ201195A3 (cs) * 2011-02-23 2012-07-04 Befra Electronic, S. R. O. Rukojet se senzorem uchopení
JP6341833B2 (ja) * 2014-10-24 2018-06-13 本田技研工業株式会社 デッドマン装置の把持検出構造
JP2018204496A (ja) * 2017-06-01 2018-12-27 株式会社やまびこ エンジン作業機
CN117242975A (zh) 2017-06-23 2023-12-19 创科（澳门离岸商业服务）有限公司 割草机

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US7795882B2 (en) 2004-02-17 2010-09-14 Gustav Magenwirth Gmbh & Co. Kg Operator sensing circuit for disabling motor of power equipment

Also Published As

Publication number Publication date
WO2001055510A1 (fr) 2001-08-02
US20020189219A1 (en) 2002-12-19
JP2003520923A (ja) 2003-07-08
JP4555535B2 (ja) 2010-10-06
US6651608B2 (en) 2003-11-25
DE50102406D1 (de) 2004-07-01
DE10003486C1 (de) 2001-07-26
EP1250493B1 (fr) 2004-05-26

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