• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to handheld work tools with a drive motor, which drives a tool (7) and a generator (23). The work tool (1) has a first electricity consumer (13) and a connectable second electricity consumer. The generator (23) provides the electric power for the simultaneous operation of the consumers. The work tool has a control device (40) for controlling the power supplied to the first electricity consumer (13). In order to supply an approximately equal power independently of voltage fluctuations, a voltage monitoring circuit is provided, which in a first operation (I) sets up the voltage monitoring circuit with a first signal sequence (45) for operation of the first consumer (13) and in a second operation (II). sets up a second, second signal sequence (46) for operation of the first consumer (13). The average power for the first signal sequence (45) and the average power for the second signal sequence (46) are approximately equal.
    公开号:SE537391C2
    申请号:SE1250278
    申请日:2012-03-21
    公开日:2015-04-21
    发明作者:Heinrich Leufen；Jörg Präger；David Fallscheer
    申请人:Stihl Ag & Co Kg Andreas；
    IPC主号:
    专利说明:

    HANDHALL WORK TOOL WITH A CONTROL DEVICE FOR OPERATION OF AN ELECTRIC CONSUMER The invention relates to a hand-held work tool with a drive motor, which drives a tool and a generator according to the preamble of claim 1.
    DE-A1-199 53 914 is a hand-held work tool, the drive motor of which drives a generator. The generator emits the power for driving a first electricity consumer as a heating device. The generated generator power varies depending on the speed. At low speeds only low power is available, at high speeds however high. The heating device is thereby designed so that at low speeds a sufficient heating can be obtained, so that, for example, during a carburettor heating, the humidity in the surrounding environment freezes at the carburettor housing. In this case, it must be ensured that no overheating of the carburettor occurs, as in the event of a carburettor heating an overheating can lead to vapor formation in the industry and thereby to an unstable engine run of the internal combustion engine.
    To control the heating power of a carburettor heater, DE-Al-10 2006 037 572 describes how to control the heating power of a heating device depending on the speed of the internal combustion engine. For this, a control device is provided, which controls the supplied heat energy depending on the speed of the internal combustion engine. If the carburettor heating is optimally designed with such a control device, even at low external temperatures, an interference-free mixture and thus a proper operation of the internal combustion engine can be provided.
    If additional heating devices are connected to the carburettor heating, eg gripper heaters, the voltage is interrupted during the carburettor heating as the generator can only provide a limited electrical power. The breaking of the voltage during the carburettor heating can cause a temperature drop.
    The object of the invention is to provide a handheld work tool of a type according to the preamble so that with little technical responsibility a first electricity consumer is fed with approximately the same continuous electrical power, independent of switching on or disconnecting an additional electricity consumer.
    This second pin is solved according to the jug-drawing features of claim 1. The voltage monitoring circuit of the control device monitors a voltage which changes depending on the switched-on or disconnected electricity consumers. In a first operation, the voltage monitoring circuit is arranged to set up a first signal sequence for operation by the first consumer and in the second operation layer another, second signal sequence for operation by the first consumer. The signal sequences themselves are different, whereby, for example, the second signal field may have a lower amplitude, but a higher frequency. They are designed so that regardless of the design of the signal sequence, the average power of the first signal sequence and the average effect of the second signal sequence can be approximately equal. As a result, in the event of a break in the voltage at the first consumer, switching is given to a signal sequence which compensates for the power broken by the broken voltage. As a result, the first electric user is also driven when the voltage is broken with essentially the same electrical power as at the unbroken voltage.
    The voltage monitoring circuit is in the simplest way designed so that a load-dependent voltage is sensed and below a certain voltage threshold value the control device is operated in a second operation, while above the voltage threshold value it is connected in the first operating layer. The voltage monitoring circuit can, at low generator voltage, trigger switching of the control device to the other operating layer, so that even at a set speed a sufficient power effect is delivered to the electric user. The breaking of the voltage can take place by switching on the connection of additional electric users as well as by a reduction in the speed of the combustion engine.
    The object of the invention is to provide a substantially equal power in a heating device in a work tool with an internal combustion engine in which only the generator voltage is monitored immediately or immediately, regardless of oscillations of the monitored device coupled from a first signal sequence to a second signal sequence. admittedly are different but supply essentially the same electrical power.
    Separately, the switching of the control device from the first to the second operating layer takes place with the connection of the second user, which can be designed as a heating device.
    The signal sequences of the first and second operating layers of the control device may differ in that the second signal sequence during the same unit of time has several signals than the first signal sequence, i.e. has a higher frequency. The voltage amplitude of the second signal sequence is then lower than that of the first signal sequence. It may be appropriate that the signal length of a signal in the second signal sequence is longer than that of a signal of the first signal sequence for all smoothed interruption of the signal amplitude.
    Preferably, the first and second consumers are heater devices, the first heater device being separately a carburetor heater, while the second heater device may be a grip heater.
    The consumers are immediately applied to an alternating voltage of the generator, so that the power supplied to the consumer can be installed with a half-wag circuit. Alternatively, at an alternating voltage, the power Mien supplied to the Consumer can be set with a phase component control.
    Further features of the invention are given by the subclaims, the description and the drawing figures in the following, in connection with a described embodiment of the invention, in which: Fig. 1 shows a schematic view from the side of a hand-held barbable work tool such as a chainsaw, Fig. 2 shows a schematic wiring diagram for energy supply of heating devices with a control device, Fig. 3 shows a schematic view of a first heating device Over a half-axis circuit supplying alternating voltage in a first operation of the control device, Fig. 4 shows a schematic view Over a half-wave circuit supplied alternating voltage according to Fig. 3. a second operation of the control device, Fig. 5 shows a schematic view of a first heating device Over a phase component control supplied alternating voltage in a first switching layer for the control device, Fig. 6 shows a schematic view of Over a phase component control supplied alternating voltage according to Fig. 5 in a second switching layer of the control device, Fig. 7 shows a schematic view of the coupling layer of the operating layers depending on a monitored voltage.
    The control device according to the invention for controlling the electric power supplied to an electricity consumer is described as an embodiment of an electric power supplied to a heating device. The heating device is built into a work tool, as shown in Fig. 1. The hand-held work tool 1 is a barbaric, hand-held work tool, which is described below 3 exemplified as a chainsaw. The work tool can also be designed as an angle grinder, as a hacksaw, as a saw, as a blower unit or the like.
    The work tool 1 has a housing 2, in which an internal combustion engine 8 is arranged. At the housing 2 a rear handle 4 is arranged, which is arranged along the longitudinal direction of the work tool 1. In the front, upper area of the cover 2 a gripping tube is arranged as the front handle 3, which grips the upper side of the cover 2 in a bag, which is essentially arranged perpendicular to the longitudinal direction of the work tool 1. At the rear face 4 of the housing 2 opposite the handle 2, a tool 7 is arranged, which is driven by the combustion engine 8, which in the embodiment is designed as a saw chain running on a guide rail 6 cm. The guide rail 6 runs parallel to the longitudinal direction of the working tool 1 from the front front of the housing 2 to the front. For operating the internal combustion engine 8, a throttle control 5 is pivotally arranged in the rear handle 4, with which the speed of the internal combustion engine which is designed as a two-stroke engine is controllable. The throttle control 5 is provided with a throttle control lock 35 stored in the handle 4. In the embodiment shown, the internal combustion engine 8 is designed as a two-stroke engine, especially as a single-cylinder two-stroke engine. The internal combustion engine 8 has a cylinder 14, in which a fire chamber 15 is formed. The fire chamber 15 is bounded by a piston 16. The piston 16 drives a crankshaft 18 rotatably mounted in a crankcase 22 rotatably about an axis of rotation 24. Within the lower area of the piston shown in Fig. 1, the crankcase 22 and the fire chamber 15 are connected to each other over overflow channels 17.
    The internal combustion engine 8 has an inlet 19 for a fuel / air mixture in the crankcase 22 as well as an outlet 20, over which the exhaust gases from the fire chamber are diverted. The combustion engine 8 sucks via an intake duct 11 into the fuel / air mixture via a carburettor 10, which is previously provided with an air filter 9, via which the combustion air necessary for the operation of the engine tightens.
    In addition, a supply duct 12 opens at the air filter 9, which at the cylinder 14 opens into the area of the upper piston 16 and which in the upper upper part of the piston 16 communicates with the overflow channels 17 formed at the piston 16. Via the supply duct 12 the combustion engine sucks in the flushing channels. 17. The intake duct 11 and the supply duct 12 are formed in a common component 25, via which the carburettor 10 is connected to the cylinder 14. Between the carburettor 10 and the socket-shaped component 25 an electric heating element 13 is arranged, which can be fixed to the carburettor 10 and serve for heating of the carburettor 10. The electric heating element 13 forms the first heating device 113 in the work tool 1. 4 In operation, the combustion engine 8 sucks a fuel-air mixture into the crankcase 22 via the intake duct 11, while via the supply duct 12 substantially free combustion air flows into the combustion air 17 from the combustion air. Good The sludge / air mixture is compressed during the downflow of the piston 16 into the crankcase 22 and thereby flows via the flood channels 17 into the fire chamber 15, as soon as the flood channels 17 are opened by the piston leading to the crankcase 22 towards the fire chamber 15. The flow channels the fresh industrial air mixture from the crankcase 22 in the combustion chamber 15 from the exhaust gases present in the combustion chamber 15, which is flushed out through the outlet 20. At the opening of the piston 16, the freshly tightening fuel-air mixture is compressed in the combustion chamber 15 and in the outer tooth. which is not displayed. When the piston 16 descends, the outlet 20 is opened and the exhaust gases flow out of the fire chamber 15, whereby they are simultaneously displaced by the flushing flow air flowing over the overflow ducts 17 to the outlet.
    For operation of the internal combustion engine 8, a sufficient amount of fuel must be sucked in via the intake duct. At low temperatures, moisture from ambient air can settle in the carburetor 10 and freeze there. This can affect the function of the carburetor 10. To avoid ambient temperatures at the carburettor 10, the first heating device 113 is provided with the heating element 13 as the first electric consumer 27. The heating element 13 is electrically heated and heats the carburettor 10 at low external temperatures.
    At low temperatures, not only a heating of the dye 10 is suitable; The handgrips 3 and 4 arranged to control the work tool again have a heating device 133 with a heating element 33 and a second heating device 134 with a heating element 34. By means of the heating devices 133 and 134 the handles 3 and 4 are heated during use. the work tool 1 its warm hands, which not only contributes to comfort but also facilitates a things handling of the work tool 1 at low temperatures. These second heating devices 133, 134 form the second electricity consumer, which can be switched on if necessary.
    The heating devices 113, 133 and 134 are designed as electricity consumers 27, 37 and are supplied by a generator 23 with electric power. The generator 23 is driven by the crankshaft of the internal combustion engine 8 and rotates depending on the speed of the internal combustion engine. In the case of a direct drive of the generator, the speed of the generator 23 corresponds to the speed of the internal combustion engine 8.
    A schematic circuit diagram of the wiring of the generator 23 to the heating element 13 of the first heating device 113 as the first electricity consumer 27 and the heating element 33 or 34 of the second heating devices 133, 134 as second electricity consumers 37 is shown in Fig. 3.
    As Fig. 2 shows, the second heating device 133, i.e. the second electricity consumer 37, can be switched on and off via a switch 30. The first electricity consumer 27, i.e. the first heating device 113, can be permanently connected to the terminals of the generator 23; For example, a bimetallic switch may be provided which divides the electrical circuit between the generator terminals and the first heater device 113 above a threshold value such as 0. Advantageously, an NTC thermosensor is used which is connected to a controller integrated with the controller 40, so that a simple temperature control of the first heater 113 can be achieved. In this way, the temperature of the first heater 113 is easy to monitor and also to set securely via the controller.
    If the first electricity consumer 27, ie the heater device 113 of the carburettor heater, is connected, the entire generator voltage UGI is located at the carburettor heater. In the embodiment, in series with the heating element 13 of the first heating device 113, a control device 40 is connected, so that the heat flow I flows through both the heating element 13 and also the control device 40.
    The control device 40 comprises a voltage monitoring circuit 41, which in the embodiment shown is integrated in the control device 40. The electrical power supplied to the first consumer 27 is lamped by means of the control device 40. The gear voltage UG obtained from the generator 23 according to a special embodiment of the invention Over a half-wave circuit integrated in the control device 40 or a phase component control at the first electricity consumer 27, whereby for example a temperature connection for the heating element 13 of the first electricity consumer 40 can be shown. the dashed line in Fig. 2.
    The total power of the generator 23 is designed so that the first electricity consumer 27, namely the first heating device 113, as well as the second heating device 134 as well as second grip heaters can be supplied with electric power. If the gripper heaters are switched off at the Open switch 30, the entire electrical power of the generator 23 is supplied to the first electric consumer 27 has the carburettor heater. The heating element 13 of the carburettor heater could be overheated. Dail & it is designed so that the control device 40 is arranged so that by the influence of the applied generator voltage the liquid current lv is limited to a 6 medium current and thus to an average power, which corresponds to a desired temperature of the heating element 13.
    Fig. 3 shows the generator voltage U, 1 applied over a half-wave circuit at the first electricity consumer 27. The alternating voltage of the generator 23 is sparred for one or more half-waves 47, so that breaks P are given with the duration t in the alternating voltage. During a break no current flows so that during the break time the current generator voltage is applied to the control device 40. The voltage monitoring circuit 41 evaluates the generator voltage recorded during a pause P and, depending on the generator voltage, switches on either the first signal sequence 45 or the second signal sequence 46 (Fig. 4). The first signal sequence is set so that even at the highest speed of the internal combustion engine 8 and the power then emitted from the generator 23 an overheating of the heating element 13 and thus the undesired high temperatures at the carburettor 10 are safely avoided.
    The second signal sequence 46 has in a similar time window T several half-waves 48 than the first signal sequence 45. In addition, the amplitude 44 of a signal 48 of the signal sequence 46 with the quantity Uv2 is smaller. The increased number of half-waves 48 in the same time unit T thus equalizes the generator voltage interrupted due to the load by the second consumer 37 in such a way that the heating element 13 of the first heating device 113 is supplied with approximately the same electrical energy as during the time unit T during the first operating layer. and the first signal sequence 45. The pauses P between two signals 48 of the signal sequence 46 correspond to the pauses P between the signals 47 of the signal sequence 45, however, fewer pauses occur over time.
    To reduce it due to. the load through the second consumer 37 reduced the generator voltage, a phase component control can also be used, the function of which is explained in more detail in connection with Figures 5 and 6.
    As shown in Fig. 5, the generator voltage is affected in such a way that after a zero crossing a variable saving time is installable, ie. between two half-waves 147 installable pauses P are given with the duration t1. Each halfway is connected to the electricity consumer, however, the signal length T for a halfway 147 is installable. The pauses P and thus the signal length T kw one-half of the signal sequence 45 are designed in Fig. 5 so that even at the highest speed of the internal combustion engine 8 and the power then emitted from the generator 23 an overheating of the heating element 13 and armed unwanted high temperature at the carburetor 10 can be safely avoided. . 7 If the second electricity consumer 37 is switched on by closing the switch 30, it is given due to the electrical load again a reduction of the generator voltage, which is detected by the voltage monitoring circuit 41 in a pause P and leads to a switching to the second signal sequence 46 according to Fig. 6. The signal height 44 of the half-waves 148 of the signal sequence 46 is less than the signal height 49 of the first signal sequence 45, which is given by the increased electrical load of the generator 23. In order to supply the first electrical consumer with the same electrical power in a similar unit of time, the phase time At2 is reduced by the phase component control so that the signal length T Okas. As a result, despite decreasing generator voltage, the first electricity consumer 27 is supplied with the same electrical power as before the second electricity consumer 37 is connected.
    At an arbitrary speed n of the internal combustion engine 8, the voltage monitoring circuit 41 has the task of switching on the second electricity consumer 37 in the form of the second heating devices 133, 134, i.e. to determine grip heat. This is done by monitoring the current generator voltage UG during the pauses P of the affected signal sequence 45 or 46. During a certain voltage threshold value Us (Fig. 7), the control device 40 is operated in operating mode 11 (Fig. 5); exceeds the monitored voltage U the threshold value Us this is determined by the voltage monitoring circuit 41 and the control device 40 is reconnected to the first operating layer I. In the first operating layer I a signal sequence 45 with a certain average power is set in, which for example ensures sufficient heating of the carburettor without . Does the generator voltage drop due to an additional electrical load, thus decreases due to. a changed generator voltage averages the average power for the first signal sequence 45, switches the control device to a second predetermined signal sequence 46, which, taking into account the decreasing generator voltage, sets a approximately the same average power as for the first signal sequence 45, regardless of the switching on or off. The first heater device 113, namely the carburettor heater, has a substantially similar effect, which produces a substantially similar heating of the carburettor 10 to a certain temperature.
    It may be advantageous to design the switching device in such a way that the switching from a first signal sequence 45 to a second signal sequence 46 is driven at approximately the same average power also depending on the speed of the generator. If the speed is set, ie the generator voltage is small, the first electricity consumer is driven with a second signal sequence 46; akar speed and armed generator voltage are switched to the first signal sequence 45. 8
    权利要求:
    Claims (10)
    [1]
    Handheld work tool with an internal combustion engine as drive motor, which drives a tool (7) and a generator (23), where the work tool (1) has a first power consumer (27) fed by the generator (23) and the work tool (1) has another the generator (23) can be connected to other electricity consumers (37), where the generator (23) is designed so that it provides the power for simultaneous operation of the first and the second electricity consumer (27, 37) and the work tool has a control device (40) for controlling the power supplied to the first electricity consumer (27), characterized in that the control device (40) comprises a voltage monitoring circuit (41), that the voltage monitoring circuit (41) monitors the generator voltage (UG) of the generator (23), that the voltage monitoring circuit (41) exceeds a predetermined voltage threshold value ( Us) of the generator (23) switches the control device (40) in a first operating layer (I), and in the first operating layer (I) the first consumer (27) is supplied with a first signal sequence (45) for is operated by the first consumer (27), that the voltage monitoring circuit (41) below the predetermined voltage threshold value (Us) of the generator switches the control device (40) in a second operating layer (II) and in the second operating layer (II) is supplied to the first consumer (27). ) a second, second signal sequence (46) for operation of the first consumer (27), where the average electrical power of the first signal sequence (45) and the average electrical power of the second signal sequence (46) are equal.
    [2]
    Work tool according to claim 1, characterized in that the switching of the control device (40) takes place from the first to the second operating layer (II) with the connection of the second electricity consumer (37).
    [3]
    Work tool according to Claim 1 or 2, characterized in that the signal amplitude (44) for the second signal sequence (46) is smaller than the signal amplitude (49) for the first signal sequence (45).
    [4]
    Work tool according to any one of claims 1 to 3, characterized in that the signal width (At) of a signal (48) of the second signal sequence (46) is greater than the signal width (At) of a signal of the first signal sequence (45). 9
    [5]
    Work tool according to claim 1, characterized in that the first and / or the second electricity consumer (27, 37) are heating devices (113, 133, 134).
    [6]
    Work tool according to claim 5, characterized in that the drive motor is an internal combustion engine (8) with a carburettor (10) and that the first heating device (113) is a carburettor heater.
    [7]
    Work tool according to claim 5 or 6, characterized in that the work tool (1) has at least one handle (3, 4) for controlling the work tool (1) and the second heating device (133, 134) is a grip heater.
    [8]
    Work tool according to one of Claims 1 to 7, characterized in that the consumers (27, 37) engage in an alternating voltage of the generator (23).
    [9]
    Work tool according to any one of claims 1 to 8, characterized in that the power supplied to the consumer (27, 37) is installable with a half-wave circuit.
    [10]
    Work tool according to one of Claims 1 to 8, characterized in that the power supplied to the consumer (27, 37) can be installed with a phase component control. 1 ■ 1 113 G
    类似技术:
    公开号 | 公开日 | 专利标题
    SE536117C2|2013-05-14|Handheld work tool with an electric heating element control device
    US9140204B2|2015-09-22|Handheld work apparatus having an air-cooled combustion engine
    JP4533693B2|2010-09-01|Internal combustion engine carburetor device
    US9103289B2|2015-08-11|Method for controlling the limiting of the rotational speed of a combustion engine
    CN102484447B|2015-05-06|Electrodynamic braking device for universal motor
    US9873193B2|2018-01-23|Method for operating a handheld work apparatus having a combustion engine
    CA2389122C|2004-11-30|Method and apparatus for controlling engine speed of a welding generator
    US20140165525A1|2014-06-19|Motor drive device and electric mowing machine
    US7816796B2|2010-10-19|Hand-held power tool and method for operating a heating device of a hand-held power tool
    JP2013151862A|2013-08-08|Engine working machine
    WO2009079086A1|2009-06-25|Plasma cutter having microprocessor control
    US9695720B2|2017-07-04|Method of regenerating exhaust gas post-processing apparatus in engine-driven generator, and regeneration apparatus
    JP3493584B2|2004-02-03|In-car heating and ventilation system
    WO2008081509A1|2008-07-10|Drive controller of electrically driven vehicle
    SE537391C2|2015-04-21|Handheld work tool with a control device for operation of an electricity consumer
    JPH05248230A|1993-09-24|Method and apparatus for controlling operation of secondary air pump
    JP2004308593A|2004-11-04|Engine starter
    CN108463735B|2019-04-19|Electricity generation system
    JP2008061180A5|2010-08-26|
    EP3567241A1|2019-11-13|Handheld engine-driven working machine
    US8222848B2|2012-07-17|Time delay contactor for aircraft APU starter
    SE458978B|1989-05-22|SYSTEM FOR HEATING AND / OR HEATING OF AT LEAST ONE PART OF A MOTOR VEHICLE
    JP2014148931A|2014-08-21|Engine work machine
    JP2011190732A|2011-09-29|Engine tool
    JP2011147375A|2011-08-04|Implement and method for controlling implement
    同族专利:
    公开号 | 公开日
    US20120266850A1|2012-10-25|
    SE1250278A1|2012-10-24|
    CA2775403C|2018-09-18|
    CA2775403A1|2012-10-23|
    CN102773845B|2016-12-14|
    CN102773845A|2012-11-14|
    DE102011018517A1|2012-10-25|
    US8667955B2|2014-03-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE457575B|1986-11-17|1989-01-09|Ve Haa Construction Ab|ELECTRONIC REGULATOR FOR CONNECTING BETWEEN AN AC POWER GENERATOR AND A POWER CONSUMER|
    US5625276A|1994-09-14|1997-04-29|Coleman Powermate, Inc.|Controller for permanent magnet generator|
    SE520988C2|1998-11-12|2003-09-16|Stihl Maschf Andreas|Hand-made work tool with generator|
    DE602004032279D1|2003-02-05|2011-06-01|Makita Corp|Power-driven tool with torque limitation using only a rotation angle sensor|
    JP4175648B2|2004-07-20|2008-11-05|国立大学法人広島大学|Processing equipment|
    ES2349829T3|2005-08-10|2011-01-11|Energetix Voltage Control Limited|VOLTAGE REGULATION DEVICE.|
    DE102006037572B4|2006-08-11|2021-12-16|Andreas Stihl Ag & Co. Kg|Hand-held tool and method for operating a heating device of a hand-held tool|
    JP5416893B2|2006-08-16|2014-02-12|アンドレアスシュティールアクチエンゲゼルシャフトウントコンパニーコマンディートゲゼルシャフト|Method for detecting operating parameters of a working machine with an internal combustion engine|
    US7859124B2|2006-08-16|2010-12-28|Andreas Stihl Ag & Co. Kg|Internal combustion engine with alternator|
    US7552714B2|2006-08-16|2009-06-30|Andreas Stihl Ag & Co. Kg|Ignition device for an internal combustion engine and method for its operation|
    US20100065295A1|2007-03-20|2010-03-18|Hitachi Koki Co., Ltd.|Cordless power tool and accomodation case|
    EP2030709A3|2007-08-29|2013-01-16|Positec Power Tools Co., Ltd.|Power tool|DE102019003684A1|2019-05-27|2020-12-03|Siempelkamp Maschinen- Und Anlagenbau Gmbh|Device and method for assembling material panels|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011018517A|DE102011018517A1|2011-04-23|2011-04-23|Hand-held implement with a control device for operating an electrical load|
    [返回顶部]