EP2220383A1 - Hydraulische steueranordnung - Google Patents
Hydraulische steueranordnungInfo
- Publication number
- EP2220383A1 EP2220383A1 EP08774826A EP08774826A EP2220383A1 EP 2220383 A1 EP2220383 A1 EP 2220383A1 EP 08774826 A EP08774826 A EP 08774826A EP 08774826 A EP08774826 A EP 08774826A EP 2220383 A1 EP2220383 A1 EP 2220383A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- consumer
- arrangement according
- consumers
- hydraulic
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
Definitions
- the invention relates to a hydraulic control arrangement for supplying a plurality of hydraulic consumers according to the preamble of patent claim 1.
- LS load sensing
- throttle systems are often used.
- the pump pressure is adjusted depending on the highest load pressure of the consumer.
- each of the consumers is assigned an adjustable measuring orifice and a pressure compensator, which keep the pressure medium volume flow independent of the load pressure.
- LUDV systems a subgroup of LS systems - the pressure compensator is connected downstream of the continuously adjustable metering orifice and acted upon in the closing direction by the highest load pressure of all consumers and in the opening direction by the pressure downstream of the metering orifice.
- the available volume flow in LUDV measuring systems is proportionally divided in proportion to the opened measuring orifice cross-sections.
- the pump flow rate is thus adapted to the respective requirements.
- the pump in a load pressure dependent working throttle system, the pump always promotes the maximum possible or a constant flow rate.
- the pump can be designed as a constant or variable.
- These throttle controls use open-center control blocks, as described, for example, in data sheet RE 64 122 / 05.03 from Bosch Rexroth AG. These control blocks have a variety of directional control valve elements that lead in their basic position the pump flow with low pressure loss via a circulation channel back to the tank. When adjusting the valve piston of a valve element, the connection to the associated consumer is steadily turned on, while the pressure fluid volume flow is throttled in the circulation channel, so that the pump pressure rises to the load pressure of the consumer.
- the pump flow is increasingly reversed from the circulation channel to the consumer channel.
- the volume flow is then divided into individual consumers depending on the respective load pressure, due to the load pressure dependence, the pressure medium preferably flows to the consumer with the lowest load pressure.
- a pump pressure sets in that corresponds approximately to the highest load pressure of the consumer plus a predetermined pressure difference. Accordingly, the pump pressure must be throttled for operating the load-lowest consumer accordingly, so that considerable losses.
- the pump pressure is throttled by the individual pressure compensators assigned to the lower-load consumers, so that losses also occur.
- a disadvantage of this solution is that the device complexity is considerable due to the large number of hydraulic motors and thus the energy savings is consumed by the higher investment costs.
- the invention has the object to minimize the energy loss in such control arrangements with low device complexity.
- the hydraulic control arrangement has a pump for supplying pressure medium to a plurality of consumers.
- the control arrangement according to the invention comes with a single hydraulic motor, which is assigned to several, preferably all consumers and is followed by a Um Kunststoffan für only the lastniedrigsten or one of the lower-load consumer.
- the hydraulic energy of the pressure medium flowing away from this consumer is thus used to drive the hydraulic motor associated with a plurality of consumers, so that practically the "load pressure" of this low-load consumer is raised by the additional drive of the hydraulic motor and correspondingly energy can be saved.
- the solution according to the invention is distinguished from the initially known solution by a considerably reduced device complexity, wherein the throttling losses at the low-load consumer can be used for the pump drive, so that the energy saving is almost of the same order of magnitude as in the prior art.
- the consumers are designed as differential cylinder, the annular space or - depending on the load direction - the cylinder chamber is respectively connected to the return, the return of the low-load consumer is guided via the Um Kunststoffan für to the hydraulic motor and the pressure medium from the load higher consumer over the directional control valve arrangement flows to the tank.
- the Um bruisean Alba advantageously has a consumer associated continuously adjustable directional control valves, which are actuated in response to the load pressure.
- control takes place in the direction of control of the connection to the hydraulic motor by the load pressure of the respective consumer and in the opposite direction by the load pressure of the other consumer.
- control of the directional control valves is electrically dependent on the pressure difference between the highest load pressure (pressure in the cylinder chamber of the consumer) and the pressure in the return (pressure in the annulus).
- the directional control valves of Um tenuanssen are designed as continuously adjustable 3-way valves, wherein working ports of the directional control valves each with the decreasing pressure chamber of the consumer, return ports of the directional control valves each with a working port of the associated - A -
- Directional valve element and Um bruisean realise the directional control valves are connected to the input port of the hydraulic motor.
- the continuously adjustable directional control valves can also control a throttle cross-section to the return port and thus to the associated directional valve element when controlling the pressure medium connection to the hydraulic motor.
- the pump of the control arrangement according to the invention can be designed as a constant or variable.
- the pump can be designed as a double pump with pump units connected in parallel.
- the invention can be used particularly advantageously in control arrangements with at least two consumers.
- the control arrangement can be designed as EFM, LS, LUDV or throttle control.
- Figure 1 is a circuit diagram of a first embodiment of a hydraulic control with electrically operated directional control valves of a reversing device
- Figure 2 is a detail of the control arrangement of Figure 1;
- Figure 3 shows an embodiment with hydraulically operated directional valves and Figure 4 diagrams illustrating the energy saving that is possible when using the construction according to the invention.
- FIG. 1 shows a circuit diagram of a designed as LS, LUDV or throttle control hydraulic control arrangement in which at least three consumers 2, 4, 6 via a pump 8, an LS, LUDV or throttle control block 10 and a reversing device 12 can be supplied with pressure medium ,
- the pump 8 is driven by a motor M.
- This drive can be supported by a hydraulic motor 14, which is also designed to be adjustable and - as indicated in Figure 1 - acts on the same pump shaft as the engine.
- the adjustment of the hydraulic motor 14 is carried out in the embodiment of Figure 1 electronically via an adjusting device 16, which will be explained in more detail below.
- the Um Kunststoffan extract 12 includes a plurality of continuously adjustable 3-way valves 18, 20, 22, each associated with one of the consumers 2, 4 and 6 respectively.
- the adjustment of these directional control valves 18, 20, 22 takes place electrically in dependence on the signal of two pressure sensors 24, 26; 28, 30; 32, 34, which are each assigned to one of the consumers 2, 4 and 6 and over which - as explained in more detail below - the lowest-load consumer is detectable.
- the control block 10 essentially consists of an input element, directional control valve elements and an output element, wherein each of the consumers is associated with a directional control valve element.
- a control block is described by way of example in the data sheets RD 64 122 (throttle control), RD 64 282 (LS control block) or RD 64 127 (LUDV control block).
- the consumers 2, 4, 6 are designed as differential cylinders, for example lifting cylinders of a mobile working device, wherein a bottom-side cylinder space 36, 38, 40 is separated from a piston rod-side annular space 42, 44, 46 via a differential piston
- FIG. 2 shows an enlarged view of the consumer 6 with the associated directional control valve 22. Accordingly, this is designed as a continuously adjustable 3-way valve with a working port A, a return port R and a Um Kunststoffan- circuit U and biased by a spring 48 in a basic position, in the working port A is connected to the return port R and the circulation port U is shut off.
- a valve spool of the directional control valve 22 can be displaced so that a connection tion from the working port A to the Um Tavernan gleich U open and the connection to the return port R is zusteueuert.
- a throttle cross-section to the return port R is opened in the end position (valve spool of the directional control valve 22 completely shifted to the left).
- this throttle cross-section is dispensed with the return port R, so that it is shut off in the end position of the valve spool.
- the working connection A is connected to the annular space 46 via a return line 52.
- the return port R is connected via a return passage 54 to a working port of the associated directional control valve element.
- the other working port of this directional control valve element is connected via a feed channel 56 to the cylinder chamber 40 of the consumer 6.
- the pressure sensors 32, 34 are arranged in the flow channel 56 and in the return channel 52, so that via these two pressure sensors each of the highest load pressure of the consumer corresponding pressure in the cylinder chamber 40 and the pressure building up in the annular space 46 is detected, which is approximately inversely proportional behaves to the load pressure of the associated consumer.
- the pressure difference detected by the pressure sensors 32, 34 and correspondingly by the pressure sensors 24, 26 and 28, 30 is a measure of the load pressure of the respective consumer.
- the effective area ratio between the cylinder chamber 40 and the annular space 46 is 2: 1 and that the load pressure of the consumer 2 100 bar, the consumer 4 is 70 bar and the consumer 6 50 bar, so is in a throttle control in the cylinder chambers 36, 38, 40 each set the highest load pressure corresponding pressure of about 100 bar.
- the pressure in the annular space 42 of the highest-load consumer 2 would then correspond approximately to the tank pressure.
- the pressure difference detected by means of the pressure sensors 24, 26 thus corresponds approximately to the load pressure (100 bar) for the highest-load consumer.
- the pressure in the annular space 44 of the somewhat lower-load consumer 4 (70 bar) would then be about 60bar, so that the pressure difference detected by the pressure sensors 28, 30 would correspondingly be 40 bar.
- a pressure of about 100 bar would set in the annular space 46, so that the pressure difference detected via the pressure sensors 32, 34 is then approximately equal to zero.
- D. h. The lowest-load consumer is in a throttle control the one in which the pressure sensors 32, 34, the lowest pressure difference is measured.
- This pressure difference is then processed by a control unit CU, which outputs a control signal to the directional control valves 18, 20, 22, so that the directional valve 22 associated with the lowest-load consumer - in the direction of an opening of the pressure medium connection between the working port A and the Um Kunststoffan gleich U is adjusted.
- the lowest load pressure can be detected directly via the sensors 26, 28, 32.
- all reversing ports U of the directional control valve 18, 20, 22 are connected to a circulation channel 58, which leads to the pressure or input port P of the hydraulic motor 14. Its tank connection T is connected via a tank line 60 to a tank 62.
- a reversing valve 64, 66, 68 opening in the direction of the hydraulic motor 14 is provided downstream of each reversing connection U of the directional control valves 20, via which a flow of pressure medium from the circulating passage 58 in the direction of the consumer 2, 4, 6 is prevented becomes.
- connection of the other two consumers 2, 4 to the control block 10 and to the Um Kunststoffan Aunt 12 is carried out according to the connection of the third consumer 6, which is explained in detail with reference to Figure 2 - it is omitted for simplicity, the corresponding, the consumers 2, 4 assigned channels and lines to be provided with reference numerals.
- the pressure medium is conveyed by the pump 8 via a common supply channel 70 to the consumer valve 2, 4, 6 associated directional control valve elements 10 of the control block.
- the pressure medium flowing back from the higher-load consumers 2, 4 is returned to the tank 62 via these directional control valve elements - this pressure medium flow path is not shown in FIG. 1 for the sake of simplicity.
- the adjustment of the hydraulic motor 14 is also carried out electrically in response to the load pressures from the sensors 24, 26; 28, 30; 32, 34 are detected.
- Such an electronic adjusting device 16 may for example be designed as shown in Figure 1 bottom right.
- Such adjusting device 16 has an actuating cylinder 72 which, in its spring-biased basic position, sets the displacement of the hydraulic motor 14 to 0.
- actuating cylinder 72 which, in its spring-biased basic position, sets the displacement of the hydraulic motor 14 to 0.
- To increase the swallowing Volume of the actuating cylinder 72 can be acted upon via a pressure reducing valve 74 with a control pressure whose size is set via the control unit CU.
- the pressure reducing valve 74 can be electrically actuated or even be adjustable via a control pressure, which is predetermined by the control unit CU.
- Such actuators for hydraulic motors 14 are known, so that further explanations are unnecessary.
- the reference numeral 8 represents a further variant of a throttle control arrangement according to the invention.
- the pump 8 may be formed of two pumping units 82, 84, which are connected in parallel to each other and driven by a common motor M and the hydraulic motor 14. In this way, it is possible to ensure a high pressure medium volume flow with comparatively small pumps.
- the pressure medium flowing off via the circulation channel 58 drives the hydraulic motor 14, the displacement of which - as explained above - is set as a function of the load pressure of the last-lowest consumer 6. Pressure medium in the pressure medium flow path to the annular space 6 is thus accumulated via the hydraulic motor 14.
- a pressure builds up, which tapped via the control line 49 and acts in the direction of the spring 48 on the valve spool of the directional control valve 22, so that the valve spool by the spring 48 and this control pressure in the control line 49 on the one hand and by the force of Proportional magnet 50 is applied on the other hand.
- This control pressure also acts on the two other directional valves 18, 20 in the closing direction, so that they are held in their basic positions shown.
- control unit CU at the beginning of the activation of the consumers 2, 4, 6 decides from the evaluation of the pressure signals. det, which is the lastniedrigere consumer and then the corresponding directional control valve 18, 20, 22 adjusted - a subsequent load pressure change is then not considered.
- the reversing arrangement 12 is designed with electrically actuatable directional control valves 18, 20, 22.
- Figure 3 shows an embodiment in which the control arrangement 12 is formed with hydraulically operated directional control valves 18, 20.
- the respective load pressure in the bottom-side cylinder chamber 36, 38 is tapped via control channels 76, 78 and to the effective in the direction of the spring 48 control surface of the associated directional control valve 18, 20 and to the opposite direction, i. in the direction of controlling the pressure medium connection to the hydraulic motor 14 effective control surface of the respective other way valve 20, 18 out.
- the directional control valves 18, 20 acted upon by the load pressure difference, wherein in the switching direction (opening of the pressure medium connection to the hydraulic motor 14) each of the load pressure of the other consumer acts.
- the adjustment of the absorption volume of the hydraulic motor 14 via a control unit 86, which consists essentially of the actuating cylinder 72 and a control valve 88.
- This is designed as a continuously adjustable 3-way valve whose input port P is connected via a pressure channel 90 to the inlet channel 70.
- the adjusting cylinder 72 is connected via a control line 92 to the output terminal A.
- the control valve 88 further has a tank port T connected to the tank T.
- the adjustment of the control valve 88 takes place as a function of the load pressure difference of the two consumers 2, 4. It is assumed that the load pressure of the consumer 2, the pressure P 1 in the pressure chamber 36th and the load pressure of the further consumer 4, the pressure p 2 in the cylinder chamber 38 of the consumer 4 is. According to the illustration in FIG.
- control valve 88 is acted upon in the direction of a connection of the outlet connection A to the tank connection S via a spring 94 and via the larger of the load pressures pi, p 2 , which is picked up by the control channels 76, 78 via a shuttle valve 96 ,
- the opposite direction ie in the direction of a connection of the pressure port P to the output port A acts the smaller of the two load pressures pi, p 2 , which is tapped via an inverse shuttle valve 98 from the control channels 76, 78.
- the adjustment of the swivel angle of the hydraulic motor 14 also takes place as a function of the two aforementioned load pressures.
- this higher load pressure is guided via the shuttle valve 96 to the effective in the direction of the spring 94 control surface of the control valve 88, while the smaller Load pressure p 2 via the inverse shuttle valve 98 acts on the effective in the opposite direction control surface of the control valve 88.
- the output port A is connected to the tank port S, so that pressure medium from the actuator cylinder 72 can flow to the tank T and the swing angle is taken back and thus according to the pressure in the circulation channel 58 increases until the smaller load pressure p 2 is only smaller than the load pressure P 1 by the pressure equivalent of the spring 94
- a hydraulic control arrangement with a pump, via which a plurality of consumers, preferably three or more consumers are supplied with pressure medium.
- the pressure medium supply via a directional control valve arrangement, which can be designed as LS, LUDV or throttle control.
- a low-pressure consumer is followed by a hydraulic motor, which is driven by the pressure medium flowing away from this consumer.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007035972A DE102007035972A1 (de) | 2007-08-01 | 2007-08-01 | Hydraulische Steueranordnung |
PCT/EP2008/058758 WO2009015998A1 (de) | 2007-08-01 | 2008-07-07 | Hydraulische steueranordnung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2220383A1 true EP2220383A1 (de) | 2010-08-25 |
EP2220383B1 EP2220383B1 (de) | 2011-03-02 |
Family
ID=39744733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08774826A Not-in-force EP2220383B1 (de) | 2007-08-01 | 2008-07-07 | Hydraulische steueranordnung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2220383B1 (de) |
AT (1) | ATE500428T1 (de) |
DE (2) | DE102007035972A1 (de) |
WO (1) | WO2009015998A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009054217B4 (de) * | 2009-11-21 | 2020-09-03 | Robert Bosch Gmbh | Hydraulikanordnung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004011168A (ja) * | 2002-06-04 | 2004-01-15 | Komatsu Ltd | 建設機械 |
JP3957061B2 (ja) * | 2002-07-08 | 2007-08-08 | 株式会社小松製作所 | 複数の圧油エネルギー選択回収装置及びその選択回収方法 |
KR101190796B1 (ko) | 2005-02-17 | 2012-10-12 | 볼보 컨스트럭션 이큅먼트 에이비 | 작업차량 제어장치 및 제어방법 |
-
2007
- 2007-08-01 DE DE102007035972A patent/DE102007035972A1/de not_active Withdrawn
-
2008
- 2008-07-07 EP EP08774826A patent/EP2220383B1/de not_active Not-in-force
- 2008-07-07 AT AT08774826T patent/ATE500428T1/de active
- 2008-07-07 DE DE502008002780T patent/DE502008002780D1/de active Active
- 2008-07-07 WO PCT/EP2008/058758 patent/WO2009015998A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009015998A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2220383B1 (de) | 2011-03-02 |
ATE500428T1 (de) | 2011-03-15 |
DE102007035972A1 (de) | 2009-02-05 |
WO2009015998A1 (de) | 2009-02-05 |
DE502008002780D1 (de) | 2011-04-14 |
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