EP3178778B1 - Hydrauliksystem für energierückgewinnung und flurförderzeug mit diesem hydrauliksystem - Google Patents

Hydrauliksystem für energierückgewinnung und flurförderzeug mit diesem hydrauliksystem Download PDF

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Publication number
EP3178778B1
EP3178778B1 EP15199182.5A EP15199182A EP3178778B1 EP 3178778 B1 EP3178778 B1 EP 3178778B1 EP 15199182 A EP15199182 A EP 15199182A EP 3178778 B1 EP3178778 B1 EP 3178778B1
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Prior art keywords
valve
pump
consumer
reservoir
port
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EP15199182.5A
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English (en)
French (fr)
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EP3178778A1 (de
Inventor
Daniel Sundqvist
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Mitsubishi Logisnext Europe AB
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Unicarriers Europe AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems

Definitions

  • the present invention relates to a hydraulic system with energy regeneration, especially for forklift trucks, and to a method of energy regeneration in a hydraulic system.
  • Forklift trucks and other types of industrial trucks for lifting, lowering and transporting heavy loads are usually equipped with hydraulic systems. Such systems should operate energy efficiently, and one way of improving their energy efficiency is by energy regeneration during lowering.
  • An example of a hydraulic lifting system with energy regeneration is disclosed in EP 1193211 B1 .
  • This system has an electrical machine that operates as a motor driving a pump during lifting and as a generator recovering energy during lowering. The lowering movement is controlled by a valve arranged in a line branching off from a pressure medium line connecting the pump to a cylinder.
  • JP 2013/159418 is another example of a system for energy regeneration in a forklift truck.
  • EP 2 657 412 is related to energy regeneration in a hybrid excavator boom actuating system.
  • a hydraulic system for a forklift truck comprising a reservoir for a hydraulic fluid, the reservoir having an inlet and an outlet; a hydraulic apparatus operable as a pump and as a generator, the hydraulic apparatus having a first port and a second port, the first port being connected to the outlet; and at least one consumer operable in a lifting mode and in a lowering mode, the at least one consumer being connected to the second port.
  • the inlet is connected to the first port via a first valve and to the at least one consumer via a second valve.
  • Each of the first and second valves is switchable between a first state allowing fluid flow towards the reservoir and a second state blocking fluid flow towards the reservoir, and a fluid flow from the at least one consumer to the reservoir is controllable so as to pass through at least one of the first and second valves.
  • the first and second valves make it possible to control the amount of fluid flowing through the pump which drives the generator during lowering operations. This enables smooth and fast lowering operations of, for instance, the forks of a forklift truck, even when the forks carry no or only a small load and also during start of the lowering operation.
  • the force required to drive the pump and generator usually causes the lowering operation to start off by a jerking movement or by a very slow downward movement since enough pressure is not available.
  • Such scenarios can be avoided by starting the energy regeneration only after a certain fluid pressure has been reached in the system, and this is made possible by the first and second valves and the way in which they are controlled to adjust level of energy recovered through the hydraulic apparatus during lowering.
  • the control may be provided in hardware, e.g. by means of valves automatically opening or closing at certain pressure levels. However, it may also be provided by means of a controller, such as a software controlled processor, receiving input of operational parameters of the system, and thereby automatically controlling the operation of the first and second valves.
  • the number of revolutions per minute (RPM) of the generator can be controlled by switching the first and second valves so as to vary the amount of fluid flowing through the pump.
  • the first and second valves thus make it possible to have the generator operate an RPM allowing the most efficient energy regeneration. Controlling and adjusting the RPM also makes it possible to reduce noise during operation of the hydraulic system and to increase the lifetime of the hydraulic apparatus.
  • the industrial truck is a forklift truck
  • the lifting mode is for lifting the forks of said forklift truck
  • the lowering mode is for lowering the forks of said forklift truck.
  • the system further comprises a control in the lowering mode arranged to determine a value of an operating parameter of the hydraulic system, to allow a fluid flowing from the consumer to the inlet of the reservoir via the second valve to bypass the pump of the hydraulic apparatus if the value is below a threshold value, and to allow the fluid to flow from the consumer to the inlet of the reservoir via the pump of the hydraulic apparatus and the first valve if the value is above the threshold value, wherein fluid flowing through the pump of the hydraulic apparatus drives the pump which, in turn, drives the motor operating as a generator.
  • At least one of the first and second valves is gradually switchable between the first and second states. This makes it possible to precisely control the fluid flow through the pump and, consequently, to control the lowering motion with high precision.
  • At least one of the first and second valves is a directional control valve.
  • directional control valves There are many different types of directional control valves that are inexpensive and readily commercially available.
  • the hydraulic system further comprises a pressure relief valve connected to the second port and to the inlet.
  • the pressure relief valve is configured to allow fluid flow, from the at least one consumer to the inlet, to bypass the second valve when a pressure at the second port exceeds a threshold value.
  • the pressure relief valve protects the pump against harmful pressure peaks.
  • an industrial truck having the hydraulic system according to the first aspect.
  • the effects and features of the second aspect are similar to those of the first aspect.
  • the industrial truck is a forklift truck, the hydraulic system according to the first aspect being particularly suitable for forklift trucks.
  • the operating parameter is continuously monitored. This makes it possible to precisely control the fluid flow through the pump and, consequently, regenerate energy efficiently.
  • the operating parameter is a rotation frequency of the power generator.
  • a rotation frequency, such as the RPM, of the power generator is usually easy to determine precisely.
  • FIG. 1 shows a hydraulic system 1 for an industrial truck.
  • the hydraulic system 1 includes a hydraulic apparatus 2 that has a battery 3, a motor 4 and a pump 5.
  • the battery 3 is electrically connected, via a motor controller 4a, to the motor 4 which is an electric motor, for example an asynchronous motor, configured to be powered by the battery 3.
  • the motor 4 is also operable as a generator configured to charge the battery 3.
  • the motor 4 is connected to the pump 5 which is a reversible, i.e. bidirectional, pump.
  • the pump 5 is operable as a pump, driven by the motor 4, and as a turbine driving the motor 4.
  • the pump 5 has a first port 5a and a second port 5b, both of which are adapted to receive and discharge a hydraulic fluid, such as oil.
  • a first line 6 connects the first port 5a of the pump 5 to an outlet 7a of a reservoir 7, such as a tank for a hydraulic fluid.
  • the first line 6 is some type of means for circulating a hydraulic fluid, typically an internal line in a valve manifold. Materials that the first line 6 can be made of include plastic materials and metals.
  • a check valve 8 is arranged in the first line 6 between the reservoir 7 and the pump 5. The check valve 8 is configured to allow fluid to flow towards the pump 5. It should be noted that, in other examples, the check valve 8 may be replaced by some other component capable of allowing fluid to flow from the reservoir 7 towards the pump 5 and preventing fluid to flow in the opposite direction. For example, instead of the check valve 8 there may be an electrically operated directional valve capable of altering the return direction of the fluid.
  • a first valve 10 is arranged in the second line 9 between the reservoir 7 and the pump 5.
  • the first port 5a and the inlet 7b are thus indirectly connected via the first valve 10.
  • the first valve 10 is a two-position directional control valve that is actuated by a solenoid. More precisely, the first valve 10 is a unidirectional proportional poppet valve.
  • the first valve 10 may be some other type of valve adapted to selectively allow and prevent fluid flow in the second line 9 between the pump 5 and the reservoir 7.
  • the first valve 10 may be a spool valve having one closed and one unidirectional control position.
  • the first valve 10 may, instead of being actuated by a solenoid, be actuated by some other electrical, mechanical or electromechanical means.
  • the first valve 10 may be directly actuated or indirectly actuated.
  • the first consumer 12 is operable in a lifting mode and in a lowering mode.
  • the first consumer 12 may for example be adapted to provide a force that lifts the forks of a forklift truck.
  • the first consumer 12 and the second port 5b are in this example indirectly connected to each other.
  • a second valve 14 is arranged in the fourth line 13 between the first consumer 12 and the reservoir 7.
  • the second valve 14 is a two-position directional control valve that is actuated by a solenoid. More precisely, the second valve 14 is a pressure compensated proportional valve allocated to control lowering motion of a load by gravity. It should be noted that, in other examples, the second valve 14 may be some other type of valve adapted to selectively allow and prevent fluid flow in the fourth line 13 between the pump 5 and the reservoir 7.
  • the second valve 14 may be a non-compensated directional control valve.
  • the second valve 14 may, instead of being actuated by a solenoid, be actuated by some other electrical, mechanical or electromechanical means.
  • the second valve 14 may be directly actuated or indirectly actuated.
  • a pressure relief valve 15 is connected to the second port 5b of the pump 5 and the inlet 7b of the reservoir 7, whereby a fluid flow from the first consumer 12 in the third line 11 can bypass the second valve 14 and go directly to the inlet 7b should the pressure in the third line 11 rise above a threshold value of the pressure relief valve 15.
  • a second consumer 16 is connected to the fourth line 13 and to the second valve 14.
  • the second consumer 16 is typically adapted to provide a force for moving the forks of a forklift truck in some other way than lifting and lowering them, for example moving the forks horizontally and/or tilting the forks.
  • the first and second consumers 12, 16 are indirectly connected to the second valve 14, but this may or may not be the case in other examples. More precisely, two control valves 17, 18 and a check valve 19 are arranged between the second valve 14 and the first and second consumers 12, 16.
  • the first consumer 12 is connected to the second valve 14 via one of the control valves 17, 18 and the check valve 19, which is closer to the second valve 14 than the control valve, and the second consumer 16 is connected to the second valve 14 via the other one of the control valves 17, 18.
  • the check valve 19 is adapted to allow fluid flow towards the inlet 7b and to prevent fluid flow in the opposite direction.
  • the check valve 19 may or may not be included in other examples.
  • the control valves 17, 18 are in this example two-position directional control valves. More precisely, the control valves 17, 18 are bidirectional poppet solenoid valves.
  • FIG. 2 shows a hydraulic system 101 for an industrial truck.
  • the hydraulic system 101 includes a hydraulic apparatus 102 that has a battery 103, a motor 104 and a pump 105.
  • the battery 103 is electrically connected, via a motor controller 104a, to the motor 104 which is an electric motor, for example an asynchronous motor, configured to be powered by the battery 103.
  • the motor 104 is also operable as a generator configured to charge the battery 103.
  • the motor 104 is connected to the pump 105 which is a reversible, i.e. bidirectional, pump.
  • the pump 105 is operable as a pump, driven by the motor 104, and as a turbine driving the motor 104.
  • the pump 105 has a first port 105a and a second port 105b, both of which are adapted to receive and discharge a hydraulic fluid, such as oil.
  • a first line 106 connects the first port 105a of the pump 105 to an outlet 107a of a reservoir 107, such as a tank for a hydraulic fluid.
  • the first line 106 is some type of means for circulating a hydraulic fluid, typically an internal line in a valve manifold. Materials that the first line 106 can be made of include plastic materials and metals.
  • a check valve 108 is arranged in the first line 106 between the reservoir 107 and the pump 105.
  • the check valve 108 is configured to allow fluid to flow towards the pump 105.
  • the check valve 108 may be replaced by some other component capable of allowing fluid to flow from the reservoir 107 towards the pump 105 and preventing fluid to flow in the opposite direction.
  • the check valve 108 there may be an electrically operated directional valve capable of altering the return direction of the fluid.
  • a second line 109 connects the first port 105a to an inlet 107b of the reservoir 107.
  • a first valve 110 is arranged in the second line 109 between the reservoir 107 and the pump 105. The first port 105a and the inlet 107b are thus indirectly connected via the first valve 110.
  • the first valve 110 is a two-position directional control valve that is actuated by a solenoid. In the normal, or unactuated, position, the first valve 110 is configured to prevent fluid flow from the pump 105 towards the reservoir 107 and to allow fluid flow in the opposite direction. In the actuated position, the first valve 110 is configured to allow fluid flow from the pump 105 towards the reservoir 107 and to prevent fluid flow in the opposite direction.
  • the motor 104 may drive the pump 105 when the first valve 110 is in its unactuated position, and the pump 105 may drive the motor 104 when the first valve 110 is in its actuated position.
  • the first valve 110 may be some other type of valve adapted to selectively allow and prevent fluid flow in the second line 109 between the pump 105 and the reservoir 107.
  • the first valve 110 may be a spool valve that has one closed position and one unidirectional control position.
  • the first valve 110 may, instead of being actuated by a solenoid, be actuated by some other electrical, mechanical or electromechanical means.
  • the first valve 110 may be directly actuated or indirectly actuated.
  • a third line 111 connects the second port 105b of the pump 105 to a consumer 112, such as a hydraulic cylinder or some other type of mechanical actuator.
  • the consumer 112 is operable in a lifting mode and in a lowering mode.
  • the consumer 112 may for example be adapted to provide a force that lifts the forks of a forklift truck.
  • the consumer 112 and the second port 105b may be indirectly connected to each other in another example.
  • the consumer 112 may be replaced by several consumers in another example.
  • a fourth line 113 connects the consumer 112 to the inlet 107a .
  • a second valve 114 is arranged in the fourth line 113 between the consumer 112 and the reservoir 107.
  • the consumer 112 and the inlet 107b are thus indirectly connected via the second valve 114.
  • the second valve 114 is a two-position directional control valve that is actuated by a solenoid. More precisely, the second valve 114 is a pressure compensated proportional valve allocated to control lowering motion of a load by gravity. In the normal, or unactuated, position, the second valve 114 is configured to prevent fluid flow from the consumer 112 towards the reservoir 107 and to allow fluid flow in the opposite direction.
  • the second valve 112 is configured to allow fluid flow from the consumer 112 towards the reservoir 107 and to prevent fluid flow in the opposite direction.
  • the second valve 114 may be some other type of valve adapted to selectively allow and prevent fluid flow in the fourth line 113 between the consumer 112 and the reservoir 107.
  • the second valve 114 may be a spool valve that has one closed position and one unidirectional control position.
  • the second valve 114 may, instead of being actuated by a solenoid, be actuated by some other electrical, mechanical or electromechanical means.
  • the second valve 114 may be directly actuated or indirectly actuated.
  • a pressure relief valve 115 is connected to the second port 105b of the pump 105 and the inlet 107b of the reservoir 107, whereby a fluid flow from the third line 111 can bypass the second valve 114 and go directly to the inlet 107b if the pressure in the third line 111 rise above a threshold value of the pressure relief valve 115.
  • the functionality of the second valve 114 and the pressure relief valve 115 may be combined as one unit using for instance an electrically operated pressure control valve.
  • the battery 102 powers the motor 104 that drives the pump 105.
  • the pump 105 draws a hydraulic fluid from the reservoir 107, the fluid flowing through the first line 106 from the outlet 107a to the first port 105a via the check valve 108.
  • the fluid is discharged through the second port 105b and flows through the third line 111 into the consumer 112, whereby the consumer 112 provides a force that lifts the forks.
  • fluid inside the consumer 112 is discharged as the forks are lowered.
  • the discharged fluid flows to the inlet port 107b of the reservoir 107, the flow path depending on whether an operating parameter of the hydraulic system is above or below a threshold value. That is to say, the flow path of the fluid is controllable, and the control is achieved by first determining the value of the operating parameter in a step S1 and then adjusting the flow path accordingly in a step S2. More specifically, if the value is determined to be below a threshold value, the second valve 114 is switched to a state allowing fluid flow so that the fluid can flow from the consumer 112 to the inlet 107b via the second valve 114.
  • the first valve 110 switched to state allowing fluid flow so that the fluid can flow from the consumer 112 to the inlet 107b via the pump 105 and the first valve 110. Fluid flowing through the pump 105 drives the pump 105 which, in turn, drives the motor 104 operating as a generator that charges the battery 102. Thus, in the lowering mode, some of the energy of the flowing fluid is recovered and stored by the battery.
  • the other valve when one of the first and second valves 110, 114 is open the other valve may be closed or open. In the former case, all of the fluid flows via the open valve to the reservoir 107, whereas in the latter case some of the fluid flows via the first valve 110 and some of the fluid flows via the second valve 114.
  • it is possible to control the amount of fluid that passes through the pump 105 something which makes it possible control the RPM of the generator 104 as well as the speed with which the forks are lowered.
  • the RPM of the generator 104 By increasing or decreasing the amount of fluid that passes through the pump 105, the RPM of the generator 104 can be increased or decreased, respectively, and thus controlled at a level at which the energy of the flowing fluid can be most efficiently recovered.
  • the lowering speed of the forks may be increased or decreased by having more or less fluid pass through the second valve 114 so as to bypass the pump 105 and the first valve 110.
  • the present invention is not limited to the preferred embodiments described above.
  • the regeneration system disclosed may be used in any type of industrial trucks, including low-lift trucks and tiller trucks.
  • additional valves for improving the control and operation even further may be included.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (7)

  1. Hydrauliksystem (1; 101) für ein Flurförderzeug, umfassend
    ein Reservoir (7; 107) für ein Hydraulikfluid, wobei das Reservoir (7; 107) einen Einlass (7b; 107b) und einen Auslass (7a; 107a) aufweist;
    eine hydraulische Vorrichtung (2; 102), die als Pumpe und als Generator betreibbar ist, wobei die hydraulische Vorrichtung (2; 102) einen ersten Anschluss (5a; 105a) und einen zweiten Anschluss (5b; 105b) aufweist, wobei der erste Anschluss (5a; 105a) mit dem Auslass (7a; 107a) verbunden ist; und
    zumindest einen Verbraucher (12; 112) der in einem Hebemodus und in einem Senkmodus betreibbar ist, wobei der zumindest eine Verbraucher (12; 112) mit dem zweiten Anschluss (5b; 105b) verbunden ist,
    wobei der Einlass (7b; 107b) mit dem ersten Anschluss (5a; 105a) über ein erstes Ventil (10; 110) und mit dem zumindest einen Verbraucher (12; 112) über ein zweites Ventil (14; 114) verbunden ist, wobei jedes der ersten und zweiten Ventile (10, 14; 110, 114) umschaltbar ist zwischen einem ersten Zustand, der einen Fluidstrom in Richtung des Reservoirs (7; 107) zulässt, und einem zweiten Zustand, der einen Fluidstrom in Richtung des Reservoirs (7; 107) blockiert, und wobei ein Fluidstrom von dem zumindest einen Verbraucher (12; 112) zu dem Reservoir (7; 107) so steuerbar ist, dass er zumindest eines der ersten und zweiten Ventile (10, 14; 110, 114) durchläuft,
    dadurch gekennzeichnet, dass das Flurförderzeug ein Gabelstapler ist und der Hebemodus zum Anheben von Gabelzinken des Gabelstaplers dient und der Senkmodus zum Absenken der Gabelzinken des Gabelstaplers dient, und dass es ferner eine Steuerung im Senkmodus umfasst, die so eingerichtet ist, dass sie:
    einen Wert eines Betriebsparameters des Hydrauliksystems (1; 101) bestimmt;
    zulässt, dass ein Fluid, das von dem Verbraucher (12; 112) über das zweite Ventil (14; 114) zu dem Einlass (7b; 107b) des Reservoirs (7; 107) strömt, die Pumpe (5; 105) der hydraulischen Vorrichtung (2; 102) umgeht, wenn der Wert unter einem Schwellenwert liegt; und
    zulässt, dass das Fluid von dem Verbraucher (12; 112) über die Pumpe (5; 105) der hydraulischen Vorrichtung (2; 102) und das erste Ventil (10; 110) zu dem Einlass (7b; 107b) des Reservoirs (7; 107) strömt, wenn der Wert über dem Schwellenwert liegt, wobei Fluid, das durch die Pumpe (5; 105) der hydraulischen Vorrichtung (2; 102) strömt, die Pumpe (5; 105) antreibt, die wiederum den Motor (4; 104) der hydraulischen Vorrichtung (2; 102) antreibt, wobei der Motor (4; 104) als Generator betrieben wird.
  2. Hydrauliksystem (1; 101) nach Anspruch 1, wobei zumindest eines der ersten und zweiten Ventile (10, 14; 110, 114) schrittweise zwischen dem ersten und dem zweiten Zustand umschaltbar ist.
  3. Hydrauliksystem (1; 101) nach Anspruch 1 oder 2, wobei zumindest eines der ersten und zweiten Ventile (10, 14; 110, 114) ein Wegeventil ist.
  4. Hydrauliksystem (1; 101) nach einem der vorhergehenden Ansprüche, ferner umfassend ein Überdruckventil (15; 115), das mit dem zweiten Anschluss (5b; 105b) und dem Einlass (7b; 107b) verbunden ist, wobei das Überdruckventil dafür ausgelegt ist, zuzulassen, dass ein Fluidstrom von dem zumindest einen Verbraucher (12; 112) zu dem Einlass (7b; 107b) das zweite Ventil (14; 114) umgeht, wenn ein Druck am zweiten Anschluss (5b; 105b) einen Schwellenwert überschreitet.
  5. Gabelstapler, der das Hydrauliksystem (1; 101) nach einem der vorhergehenden Ansprüche aufweist.
  6. Gabelstapler nach Anspruch 5, wobei die Steuerung im Senkmodus so eingerichtet ist, dass sie den Betriebsparameter kontinuierlich überwacht.
  7. Gabelstapler nach Anspruch 5 oder 6, wobei es sich bei dem Betriebsparameter um eine Drehfrequenz des Stromgenerators handelt.
EP15199182.5A 2015-12-10 2015-12-10 Hydrauliksystem für energierückgewinnung und flurförderzeug mit diesem hydrauliksystem Active EP3178778B1 (de)

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Application Number Priority Date Filing Date Title
EP15199182.5A EP3178778B1 (de) 2015-12-10 2015-12-10 Hydrauliksystem für energierückgewinnung und flurförderzeug mit diesem hydrauliksystem

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Application Number Priority Date Filing Date Title
EP15199182.5A EP3178778B1 (de) 2015-12-10 2015-12-10 Hydrauliksystem für energierückgewinnung und flurförderzeug mit diesem hydrauliksystem

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EP3178778A1 EP3178778A1 (de) 2017-06-14
EP3178778B1 true EP3178778B1 (de) 2019-05-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4403512A1 (de) * 2023-01-17 2024-07-24 Hyster-Yale Group, Inc. Hydraulik-strompackmodul

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Publication number Priority date Publication date Assignee Title
EP3013660A2 (de) 2013-06-26 2016-05-04 Parker Hannifin Manufacturing Limited Energieeffizientes steuersystem für elektrofahrzeug

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DE10048215A1 (de) 2000-09-28 2002-04-11 Still Wagner Gmbh & Co Kg Hydraulische Hubvorrichtung
KR101390078B1 (ko) * 2010-12-24 2014-05-30 두산인프라코어 주식회사 하이브리드 굴삭기 붐 구동시스템 및 그 제어방법
JP5831263B2 (ja) * 2012-02-01 2015-12-09 株式会社豊田自動織機 フォークリフトの油圧制御装置
US10024341B2 (en) * 2013-01-30 2018-07-17 Parker-Hannifin Corporation Hydraulic hybrid swing drive system for excavators
DE102013110239A1 (de) * 2013-08-22 2015-02-26 Linde Hydraulics Gmbh & Co. Kg Hydrostatisches Triebwerk
CN103924626B (zh) * 2014-04-02 2016-04-13 华侨大学 电驱动液压挖掘机的节能型转台驱动系统及驱动控制方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4403512A1 (de) * 2023-01-17 2024-07-24 Hyster-Yale Group, Inc. Hydraulik-strompackmodul

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