WO2011048261A1 - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

Info

Publication number
WO2011048261A1
WO2011048261A1 PCT/FI2010/050807 FI2010050807W WO2011048261A1 WO 2011048261 A1 WO2011048261 A1 WO 2011048261A1 FI 2010050807 W FI2010050807 W FI 2010050807W WO 2011048261 A1 WO2011048261 A1 WO 2011048261A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
control
pressure
hydraulic
main system
Prior art date
Application number
PCT/FI2010/050807
Other languages
French (fr)
Inventor
Sami Romppanen
Original Assignee
Hydroline Oy
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 Hydroline Oy filed Critical Hydroline Oy
Publication of WO2011048261A1 publication Critical patent/WO2011048261A1/en

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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6656—Closed loop control, i.e. control using feedback
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6657—Open loop control, i.e. control without feedback
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members

Definitions

  • the invention concerns a hydraulic, liquid-operated cylinder.
  • the purpose of this invention is to produce a hydraulic cylinder that helps to eliminate some of the problems discussed above. More particularly, the invention aims to achieve an intelligent hydraulic cylinder, which regulates its own volume flow based on information received from the main system.
  • the hydraulic cylinder concerned in this invention is configured to receive its operating pressure from the general pressure system through a connection point.
  • the hydraulic cylinder is connected to the main system electrical control bus through a connector and configured to receive its request and control information and its input voltage from the main system through this connector.
  • the cylinder comprises a linear position sensor component, pressure sensor components and volume flow and pressure regulation valves or partial combinations of these, and the entire cylinder in this arrangement is controlled by embedded control electronics, which is set to control cylinder function through open or closed control circuits following external control requests.
  • the hydraulic cylinder concerned in this invention is an intelligent hydraulic cylin- der operating on system pressure (same pressure and tank line throughout the machine, component or actuator), which is programmed to regulate its own volume flow and pressure with directional, digital (2/2, on/off) or pressure control valves integrated in the cylinder.
  • the hydraulic cylinder concerned in this invention works as in independent actuator in machinery or equipment. Using commands issued through an electronic bus system, the cylinder is controlled to perform various functions in its internal closed control circuit. Control of the closed circuit may be based on position, speed, force, pressure or temperature data. Combinations of these may also be used. All sensors enabling the use of a closed control circuit are integrated in the cylinder.
  • the advantages of a cylinder concerned in this invention include simplification of the hydraulic system and the consequent reduction in potential leaks, as well as a reduction in the number of external sensors needed.
  • simplification of the system brings cost savings to manufacturers and users, and the system features enable more versatile control and regulation properties of a machine or equipment as well as improved energy efficiency.
  • Characteristics of the hydraulic cylinder concerned in this invention that operates on system pressure and contains integrated regulating elements include system pressure and tank connections, an electrical connector acting as an interface with main system bus control as well as directional, digital and pressure control valves integrated in the cylinder component to control volume flow and pressure.
  • the cylinder does not feature functional units that could be considered external.
  • the electronics enabling independent operation is integrated in the cylinder component, and so are the position, pressure and temperature sensors of the control circuit.
  • the machine or system to which the cylinder is connected will regard the cylinder as a bus compo- nent, which can be controlled to perform functions independently, regulated by its closed control circuit. All data measured or internally calculated by the cylinder will also be available to the main system, as the cylinder control electronics has been set to send information on cylinder functions to the main system.
  • Figure 2 shows the wiring diagram of a cylinder featured in Figure 1.
  • An integrated hydraulic liquid-operated cylinder shown in Figure 1 comprises a linear position measurement sensor 4, pressure sensor 5 and volume flow and pressure regulation valves 6, 7.
  • the integral cylinder has a connection point 2 joining it to the pressure system, through which the cylinder receives its working pressure.
  • the integrated hydraulic cylinder 1 is connected to the main system electrical bus through connector 3, through which it receives its request information and electrical power.
  • the electrical interface can also be used to import measurement, calculation or diagnostics data from the integrated cylinder to the main system.
  • This bus connector is also used to transmit the information needed by the pressure system from the cylinder to the main system.
  • Pressure and volume flow request information associated with controlling the pressure system can be entered in the main system, based on which the main system will always only control the amount of energy nec- essary to generate the pressure and liquid flow in the general pressure system. Through this system, the energy efficiency of the entire system can be improved, as the hydraulic system only produces the energy needed to work the cylinder.
  • the integrated cylinder is controlled by embedded control electronics 8 integrated in the cylinder, which is set to regulate cylinder functions through closed or open control circuits following direct or indirect control requests from the main system.
  • a direct control request means directly opening the control valve, and an indirect one means controlling the controlled variable, such as position, pressure, force or speed, in which case the cylinder control electronics performs the necessary volume flow and pressure control steps independently.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention concerns a hydraulic, liquid-operated cylinder. A hydraulic cylinder (1) concerned in this invention is configured to receive its operating pressure from the general pressure system through a connection point (2), in addition to which the hydraulic cylinder (1) is connected to the main system electrical control bus through connector (3) and set to receive its request and control information and input voltage from the main system through this connector (3). The cylinder also comprises a linear position sensor component (4), pressure sensor components (5) and volume flow and pressure regulation valves (6, 7) or their partial combinations, and the entire cylinder in this arrangement is configured to be controlled by embedded control electronics (8), which has been set to control cylinder function through open or closed control circuits, using external control requests.

Description

HYDRAULIC CYLINDER
The invention concerns a hydraulic, liquid-operated cylinder.
Currently, the usual way of operating hydraulic actuators in machinery and equipment is a distributed system. In systems of this type, a pump is used to generate the hydraulic power, or the required pressure and volume flow for valves distributed around different parts of the system. In a conventional distributed system, the volume flow and pressure are directed from the valve to the hydraulic actuator, or cylinder, through dedicated channels (for example channels A and B). A distributed hydraulic system of this type increases the number and costs of components needed in machines and equipment. Partially integrated, so-called servo cylinders are also available in the market. These "non-intelligent" cylinders can only be controlled by such as external commands, and thus closed circuit control based on such variables as pressure is not available. In addition, systems of this type use so-called low-level control as their control information. In complex systems requiring many cylinders, the number of oil pipes and hoses goes up dramatically, while susceptibility to faults due to leaks at joints increases. Use of control circuits has traditionally required external electrical actuators that are able to convert measurement results into control pulses needed by the actuator, or a volume flow. Servo cylinders are little used because of their high price and short- comings in their control and regulation possibilities. Another highly restrictive factor is their great space requirement.
The purpose of this invention is to produce a hydraulic cylinder that helps to eliminate some of the problems discussed above. More particularly, the invention aims to achieve an intelligent hydraulic cylinder, which regulates its own volume flow based on information received from the main system.
The aim of the invention can be achieved by hydraulic cylinder with the characteristics described in the claims.
The hydraulic cylinder concerned in this invention is configured to receive its operating pressure from the general pressure system through a connection point. In addi- tion, the hydraulic cylinder is connected to the main system electrical control bus through a connector and configured to receive its request and control information and its input voltage from the main system through this connector. The cylinder comprises a linear position sensor component, pressure sensor components and volume flow and pressure regulation valves or partial combinations of these, and the entire cylinder in this arrangement is controlled by embedded control electronics, which is set to control cylinder function through open or closed control circuits following external control requests.
The hydraulic cylinder concerned in this invention is an intelligent hydraulic cylin- der operating on system pressure (same pressure and tank line throughout the machine, component or actuator), which is programmed to regulate its own volume flow and pressure with directional, digital (2/2, on/off) or pressure control valves integrated in the cylinder. The hydraulic cylinder concerned in this invention works as in independent actuator in machinery or equipment. Using commands issued through an electronic bus system, the cylinder is controlled to perform various functions in its internal closed control circuit. Control of the closed circuit may be based on position, speed, force, pressure or temperature data. Combinations of these may also be used. All sensors enabling the use of a closed control circuit are integrated in the cylinder. The advantages of a cylinder concerned in this invention include simplification of the hydraulic system and the consequent reduction in potential leaks, as well as a reduction in the number of external sensors needed. In addition, simplification of the system brings cost savings to manufacturers and users, and the system features enable more versatile control and regulation properties of a machine or equipment as well as improved energy efficiency.
Characteristics of the hydraulic cylinder concerned in this invention that operates on system pressure and contains integrated regulating elements include system pressure and tank connections, an electrical connector acting as an interface with main system bus control as well as directional, digital and pressure control valves integrated in the cylinder component to control volume flow and pressure. The cylinder does not feature functional units that could be considered external. The electronics enabling independent operation is integrated in the cylinder component, and so are the position, pressure and temperature sensors of the control circuit. The machine or system to which the cylinder is connected will regard the cylinder as a bus compo- nent, which can be controlled to perform functions independently, regulated by its closed control circuit. All data measured or internally calculated by the cylinder will also be available to the main system, as the cylinder control electronics has been set to send information on cylinder functions to the main system.
The following sections contain a more detailed description of the invention with ref- erences to the attached drawings, where Figure 1 shows a cross-section of a hydraulic cylinder based on the invention, and
Figure 2 shows the wiring diagram of a cylinder featured in Figure 1.
An integrated hydraulic liquid-operated cylinder shown in Figure 1 comprises a linear position measurement sensor 4, pressure sensor 5 and volume flow and pressure regulation valves 6, 7. The integral cylinder has a connection point 2 joining it to the pressure system, through which the cylinder receives its working pressure. The integrated hydraulic cylinder 1 is connected to the main system electrical bus through connector 3, through which it receives its request information and electrical power. The electrical interface can also be used to import measurement, calculation or diagnostics data from the integrated cylinder to the main system. This bus connector is also used to transmit the information needed by the pressure system from the cylinder to the main system. Pressure and volume flow request information associated with controlling the pressure system can be entered in the main system, based on which the main system will always only control the amount of energy nec- essary to generate the pressure and liquid flow in the general pressure system. Through this system, the energy efficiency of the entire system can be improved, as the hydraulic system only produces the energy needed to work the cylinder. The integrated cylinder is controlled by embedded control electronics 8 integrated in the cylinder, which is set to regulate cylinder functions through closed or open control circuits following direct or indirect control requests from the main system. A direct control request means directly opening the control valve, and an indirect one means controlling the controlled variable, such as position, pressure, force or speed, in which case the cylinder control electronics performs the necessary volume flow and pressure control steps independently. The invention is not restricted to the applications described above, as it can vary within the framework of the conceptual invention comprised by the claims.

Claims

1. A hydraulic, liquid-operated cylinder, characterized in that
- the hydraulic cylinder (1) is configured to receive its operating pressure from the general pressure system (2)
- the hydraulic cylinder (1) is connected to the main system electrical control bus through a connector (3) and set to receive its request and control information and its input voltage from the main system through said connector (3).
- the cylinder comprises a position sensor (4), pressure sensors (5) and volume flow and pressure regulation valves (6, 7), or partial combinations of these,
- the entire cylinder is set to be controlled by embedded control electronics (8), which has been arranged to control cylinder functions using closed or open control circuits following external control requests, and
2. A hydraulic cylinder according to claim 1, characterized in that the control electronics is set to send information about its functioning to the main system.
PCT/FI2010/050807 2009-10-19 2010-10-18 Hydraulic cylinder WO2011048261A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20096072A FI20096072A0 (en) 2009-10-19 2009-10-19 Hydraulic cylinder
FI20096072 2009-10-19

Publications (1)

Publication Number Publication Date
WO2011048261A1 true WO2011048261A1 (en) 2011-04-28

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ID=41263487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2010/050807 WO2011048261A1 (en) 2009-10-19 2010-10-18 Hydraulic cylinder

Country Status (2)

Country Link
FI (1) FI20096072A0 (en)
WO (1) WO2011048261A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671355A (en) * 2013-12-12 2014-03-26 中国航空工业集团公司金城南京机电液压工程研究中心 Built-in redundancy sensor installation structure
US10294936B2 (en) 2014-04-22 2019-05-21 Project Phoenix, Llc. Fluid delivery system with a shaft having a through-passage
US10465721B2 (en) 2014-03-25 2019-11-05 Project Phoenix, LLC System to pump fluid and control thereof
US10539134B2 (en) 2014-10-06 2020-01-21 Project Phoenix, LLC Linear actuator assembly and system
US10544861B2 (en) 2014-06-02 2020-01-28 Project Phoenix, LLC Hydrostatic transmission assembly and system
US10544810B2 (en) 2014-06-02 2020-01-28 Project Phoenix, LLC Linear actuator assembly and system
US10598176B2 (en) 2014-07-22 2020-03-24 Project Phoenix, LLC External gear pump integrated with two independently driven prime movers
US10677352B2 (en) 2014-10-20 2020-06-09 Project Phoenix, LLC Hydrostatic transmission assembly and system
US10808732B2 (en) 2014-09-23 2020-10-20 Project Phoenix, LLC System to pump fluid and control thereof
US10865788B2 (en) 2015-09-02 2020-12-15 Project Phoenix, LLC System to pump fluid and control thereof
US11085440B2 (en) 2015-09-02 2021-08-10 Project Phoenix, LLC System to pump fluid and control thereof
US11118581B2 (en) 2014-02-28 2021-09-14 Project Phoenix, LLC Pump integrated with two independently driven prime movers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030077183A1 (en) * 2001-10-24 2003-04-24 Snecma Moteurs Electrohydraulic actuator
EP1832685A1 (en) * 2004-12-28 2007-09-12 Shin Caterpillar Mitsubishi Ltd. Control circuit of construction machine
US20080022672A1 (en) * 2006-07-25 2008-01-31 Xinhua He Apparatus and method for dual mode compact hydraulic system
US20080028924A1 (en) * 2006-08-02 2008-02-07 Stephenson Dwight B Hydraulic System With A Cylinder Isolation Valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030077183A1 (en) * 2001-10-24 2003-04-24 Snecma Moteurs Electrohydraulic actuator
EP1832685A1 (en) * 2004-12-28 2007-09-12 Shin Caterpillar Mitsubishi Ltd. Control circuit of construction machine
US20080022672A1 (en) * 2006-07-25 2008-01-31 Xinhua He Apparatus and method for dual mode compact hydraulic system
US20080028924A1 (en) * 2006-08-02 2008-02-07 Stephenson Dwight B Hydraulic System With A Cylinder Isolation Valve

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671355B (en) * 2013-12-12 2017-01-11 中国航空工业集团公司金城南京机电液压工程研究中心 Built-in redundancy sensor installation structure
CN103671355A (en) * 2013-12-12 2014-03-26 中国航空工业集团公司金城南京机电液压工程研究中心 Built-in redundancy sensor installation structure
US11713757B2 (en) 2014-02-28 2023-08-01 Project Phoenix, LLC Pump integrated with two independently driven prime movers
US11118581B2 (en) 2014-02-28 2021-09-14 Project Phoenix, LLC Pump integrated with two independently driven prime movers
US10465721B2 (en) 2014-03-25 2019-11-05 Project Phoenix, LLC System to pump fluid and control thereof
US10294936B2 (en) 2014-04-22 2019-05-21 Project Phoenix, Llc. Fluid delivery system with a shaft having a through-passage
US11280334B2 (en) 2014-04-22 2022-03-22 Project Phoenix, LLC Fluid delivery system with a shaft having a through-passage
US10544810B2 (en) 2014-06-02 2020-01-28 Project Phoenix, LLC Linear actuator assembly and system
US11060534B2 (en) 2014-06-02 2021-07-13 Project Phoenix, LLC Linear actuator assembly and system
US10738799B2 (en) 2014-06-02 2020-08-11 Project Phoenix, LLC Linear actuator assembly and system
US10544861B2 (en) 2014-06-02 2020-01-28 Project Phoenix, LLC Hydrostatic transmission assembly and system
US11067170B2 (en) 2014-06-02 2021-07-20 Project Phoenix, LLC Hydrostatic transmission assembly and system
US11867203B2 (en) 2014-06-02 2024-01-09 Project Phoenix, LLC Linear actuator assembly and system
US10995750B2 (en) 2014-07-22 2021-05-04 Project Phoenix, LLC External gear pump integrated with two independently driven prime movers
US11512695B2 (en) 2014-07-22 2022-11-29 Project Phoenix, LLC External gear pump integrated with two independently driven prime movers
US10598176B2 (en) 2014-07-22 2020-03-24 Project Phoenix, LLC External gear pump integrated with two independently driven prime movers
US10808732B2 (en) 2014-09-23 2020-10-20 Project Phoenix, LLC System to pump fluid and control thereof
US11408442B2 (en) 2014-09-23 2022-08-09 Project Phoenix, LLC System to pump fluid and control thereof
US11242851B2 (en) 2014-10-06 2022-02-08 Project Phoenix, LLC Linear actuator assembly and system
US10539134B2 (en) 2014-10-06 2020-01-21 Project Phoenix, LLC Linear actuator assembly and system
US11054026B2 (en) 2014-10-20 2021-07-06 Project Phoenix, LLC Hydrostatic transmission assembly and system
US10677352B2 (en) 2014-10-20 2020-06-09 Project Phoenix, LLC Hydrostatic transmission assembly and system
US10865788B2 (en) 2015-09-02 2020-12-15 Project Phoenix, LLC System to pump fluid and control thereof
US11085440B2 (en) 2015-09-02 2021-08-10 Project Phoenix, LLC System to pump fluid and control thereof
US11846283B2 (en) 2015-09-02 2023-12-19 Project Phoenix, LLC System to pump fluid and control thereof

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Publication number Publication date
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