EP0336918A1 - Procédé pour commander une machine hydrostatique, en particulier une machine à pistons axiaux - Google Patents

Procédé pour commander une machine hydrostatique, en particulier une machine à pistons axiaux Download PDF

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Publication number
EP0336918A1
EP0336918A1 EP89890030A EP89890030A EP0336918A1 EP 0336918 A1 EP0336918 A1 EP 0336918A1 EP 89890030 A EP89890030 A EP 89890030A EP 89890030 A EP89890030 A EP 89890030A EP 0336918 A1 EP0336918 A1 EP 0336918A1
Authority
EP
European Patent Office
Prior art keywords
pressure
throttle valves
engine
motor
hydraulic motor
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.)
Withdrawn
Application number
EP89890030A
Other languages
German (de)
English (en)
Inventor
Otto Hein
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.)
GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
Original Assignee
GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
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 GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG filed Critical GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
Publication of EP0336918A1 publication Critical patent/EP0336918A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/003—Reciprocating-piston liquid engines controlling

Definitions

  • the invention relates to a hydrostatic machine with an adjusting device for adjusting the stroke or swallowing volume, a so-called secondary-controlled hydrostatic drive.
  • the hydraulic motor is supplied with an impressed pressure by a pressure oil system consisting of pumps and hydraulic accumulators.
  • a pressure oil system consisting of pumps and hydraulic accumulators.
  • the stroke volume of the hydraulic motor is continuously adjusted from zero in both directions by means of an actuating cylinder.
  • the speed of the hydraulic motor is compared with the speed setpoint by an electrical tachometer generator.
  • the control deviation is processed by a controller which changes the stroke volume of the motor with its control signal via the control cylinder in such a way that the load is kept at the desired target speed when the drive torque changes.
  • the output speed can be regulated in a wide range, with slow changes in the output torque, the dynamics of this drive system are sufficient for most applications.
  • This drive system creates difficulties in the event of sudden changes in the output torque. This occurs e.g. in the case of hydraulically driven drilling and milling tools, when the tool moves from idle to the cut or when with hydraulically driven rolls, the rolling stock enters the pair of rolls rotating at the specified speed. Torque changes from the idle torque to the load torque take place in a few milliseconds, a large drop in speed is undesirable.
  • Idling operation means that although the specified speed is maintained, the stroke volume of the hydraulic motor is adjusted to a small value due to the small idling torque.
  • the hydraulic motor When a torque surge occurs, the hydraulic motor must swivel to a stroke volume that corresponds to the load torque.
  • this due to the inertia of the engine parts to be adjusted, this is usually not possible in the short torque rise time.
  • the object on which the invention is based is therefore to create a method for shortening the settling time of a secondary-controlled hydrostatic machine.
  • this object is achieved by means of two jointly adjustable throttles arranged in the engine inlet and outlet.
  • Throttles in the inflow and / or outflow line of a hydraulic motor have become known from DE-OS 28 28 277 or from DE-OS 22 63 924.
  • the throttles described there are assigned to a hydraulic motor with a constant displacement, i.e. H. it is a primary regulated hydrostatic circuit.
  • the pump pressure is raised to such an extent that the hydraulic motor can take over the load torque after opening the throttles.
  • the speed control is not decoupled at any time, but always remains active in the sense of the secondary-controlled drive.
  • DE-OS 35 25 097 a method has become known in which either a flow control valve or a pressure reducing valve is provided in the engine inlet or a pressure control valve is arranged in the engine outlet.
  • Flow control or pressure reducing valves reduce the impressed pressure in the line section between the valves and the engine inlet to almost zero so that the engine - loaded only with the idling torque - reaches the desired swivel angle directs.
  • these valves are opened quickly, the pressure in the engine inlet suddenly increasing to the impressed pressure level.
  • the outlet-side engine pressure is increased with the pressure control valve at the engine outlet until the stroke volume of the engine is adjusted to a predetermined value. If the idle torque is low, this pressure reaches values close to those of the impressed system pressure.
  • the axial forces in the engine drive therefore reach values twice as high in idle mode than in load mode.
  • An axial piston motor 1 drives a machine 2 that cannot be described in more detail.
  • the adjusting device 3 of the axial piston motor 1 is a known unit with which the swivel angle and thus the swallowing volume of the motor 1 can be regulated depending on the load torque and the engine speed.
  • the motor 1 On the pressure side, the motor 1 is connected via a line 4 and a valve block 5 to a pressure line 6 with an impressed system pressure P.
  • the engine 1 is connected via a line 7 and the valve block 5 to a low-pressure line 8 leading to the tank T. 9 with a leak oil line is designated.
  • the valve block has two throttle valves, the throttle 10 being arranged in the inflow line 4 and the throttle 11 in the outflow line 7. With the help of the control valve 12 and the actuating cylinder 13, the two throttles 10, 11 can be opened together to the same size adjust cross section.
  • both throttles 10, 11 are set to the maximum opening cross section.
  • the full pressure difference is present at engine 1, since the system pressure from line 6 at the engine inlet and the low pressure from line 8 prevail at the engine outlet. Due to the high pressure difference and the low output torque of the motor, the adjusting device 3 has adjusted the motor 1 to a small swallowing volume.
  • the oil flow from the pressure line 6 via the line 4, the hydraulic motor 1, the line 7 and back to the low pressure line 8 is given by the engine speed and the engine intake volume. Since the latter is small, the oil flow is also relatively small.
  • the opening cross sections of the two throttles 10 and 11 are gradually reduced in time before the load torque is expected on the motor 1.
  • a closing step the pressure in line 4 and the pressure in line 7 decrease due to the instantaneous oil flow.
  • a reduced differential pressure is now present at hydraulic motor 1, adjusting device 3 of motor 1 now increases the absorption volume of motor 1 to apply the idle torque with the reduced differential pressure.
  • Due to the now increased swallowing volume of the engine since the engine speed remains the same, the oil flow through the engine 1 has increased.
  • the increased oil flow via the two restrictors 10 and 11 a priori results in an additional pressure drop in line 4 and an additional pressure increase in line 7.
  • a pressure sensor 14 is provided in line 7 according to FIG. 1, which acts via the differential amplifier 15 on the actuating device 12, 13 of the two throttles 10, 11 in such a way that by slightly increasing the two Throttle cross sections the additional pressure changes are reduced by the increased oil flow.
  • the opening cross sections of the two throttles are now gradually reduced until the swallowing volume of the engine 1 is brought to a value which it would have to have under the load torque in the steady state.
  • This displacement and the corresponding swivel angle of the motor can be determined beforehand and are therefore known.
  • the swivel angle sensor 16 on the motor 1 the instantaneous swivel angle of the motor is detected and compared with the setpoint 17 of the swivel angle.
  • the further closing of the two throttles 10, 11 is interrupted.
  • the opening cross sections of the two throttles 10, 11 are increased proportionally to the increase in torque with the aid of the functional element 18, the actuating device 12 and 13, and the engine receives the full pressure difference to an increasing extent. Since the engine is already set for a large absorption volume, it can take over the load torque with the full pressure difference. There is thus no loss of time that would be required without the device according to the invention for adjusting the engine 1 from idle to load operation.
  • FIG. 2 A modified embodiment is shown in FIG. 2, in which an oil flow sensor 19 is provided in the line 7 instead of the swing angle sensor 16. The rest of the arrangement corresponds to FIG. 1.
  • the opening cross sections of the two throttles are also reduced until the swallowing volume of the engine 1 is brought to a value which it would have to have under the load torque in the steady state. Since this swallowing volume can be determined beforehand and the engine speed is known, the oil flow through the engine can be calculated in advance. With the help of the oil flow sensor 19 in the line 7, the instantaneous oil flow in the line 7 is detected during the closing of the throttles 10 and 11 and compared with the pre-calculated oil flow setpoint 20. When the actual value of the oil flow has reached the setpoint, the further closing of the two throttles 10, 11 is interrupted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP89890030A 1988-04-08 1989-01-31 Procédé pour commander une machine hydrostatique, en particulier une machine à pistons axiaux Withdrawn EP0336918A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT917/88 1988-04-08
AT91788 1988-04-08

Publications (1)

Publication Number Publication Date
EP0336918A1 true EP0336918A1 (fr) 1989-10-11

Family

ID=3502800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890030A Withdrawn EP0336918A1 (fr) 1988-04-08 1989-01-31 Procédé pour commander une machine hydrostatique, en particulier une machine à pistons axiaux

Country Status (1)

Country Link
EP (1) EP0336918A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113738504A (zh) * 2021-09-29 2021-12-03 中车大连机车研究所有限公司 一种用于车辆的液压驱动辅助发电系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2263924A1 (de) * 1971-12-29 1973-07-12 Nobutada Hishikawa Verfahren und vorrichtung zum kaltwalzen
FR2444513A1 (fr) * 1978-12-18 1980-07-18 Gfm Fertigungstechnik Procede de regulation du passage de la matiere a travers un train de laminoir continu a entrainements individuels hydrauliques des moteurs
DE3107991A1 (de) * 1981-03-03 1982-09-23 KAMAG Transporttechnik GmbH & Co, 7900 Ulm Hydrostatischer antrieb
AT383059B (de) * 1985-06-11 1987-05-11 Voest Alpine Ag Verfahren und vorrichtung zum regeln des antriebes von drehbaren maschinenteilen, insbesondere der walzen von walzstrassen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2263924A1 (de) * 1971-12-29 1973-07-12 Nobutada Hishikawa Verfahren und vorrichtung zum kaltwalzen
FR2444513A1 (fr) * 1978-12-18 1980-07-18 Gfm Fertigungstechnik Procede de regulation du passage de la matiere a travers un train de laminoir continu a entrainements individuels hydrauliques des moteurs
DE3107991A1 (de) * 1981-03-03 1982-09-23 KAMAG Transporttechnik GmbH & Co, 7900 Ulm Hydrostatischer antrieb
AT383059B (de) * 1985-06-11 1987-05-11 Voest Alpine Ag Verfahren und vorrichtung zum regeln des antriebes von drehbaren maschinenteilen, insbesondere der walzen von walzstrassen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113738504A (zh) * 2021-09-29 2021-12-03 中车大连机车研究所有限公司 一种用于车辆的液压驱动辅助发电系统

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