EP2339073A1 - Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode - Google Patents

Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode Download PDF

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Publication number
EP2339073A1
EP2339073A1 EP09252887A EP09252887A EP2339073A1 EP 2339073 A1 EP2339073 A1 EP 2339073A1 EP 09252887 A EP09252887 A EP 09252887A EP 09252887 A EP09252887 A EP 09252887A EP 2339073 A1 EP2339073 A1 EP 2339073A1
Authority
EP
European Patent Office
Prior art keywords
pressure
load sense
line
output
input
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Withdrawn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
EP09252887A
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English (en)
French (fr)
Inventor
Mark Heptonstall
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.)
Caterpillar Inc
Original Assignee
Perkins Engines Co Ltd
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 Perkins Engines Co Ltd filed Critical Perkins Engines Co Ltd
Priority to EP09252887A priority Critical patent/EP2339073A1/de
Publication of EP2339073A1 publication Critical patent/EP2339073A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • 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
    • E02F9/2285—Pilot-operated systems
    • 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
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/605—Load sensing circuits
    • 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
    • F15B2211/65—Methods of control of the load sensing pressure
    • F15B2211/653—Methods of control of the load sensing pressure the load sensing pressure being higher than the load pressure

Definitions

  • the present disclosure relates to a hydraulic system for a machine, a machine incorporating such a hydraulic system and a method of controlling a hydraulic system.
  • the disclosure relates to improvements in connection with large work machines, such as used in the construction industry.
  • a hydraulic system including one or more hydraulic pumps being driven by an internal combustion engine.
  • the pumps are typically variable displacement pumps although fixed displacement pumps with an unloader valve are used.
  • the hydraulic system responds by directing hydraulic fluid flow to the appropriate hydraulic circuits.
  • the operator can request the implement to move in a desired direction at a prescribed velocity and to apply a desired amount of force by manipulating the appropriate input device.
  • the prior art discloses certain systems for adjusting the output flow of a variable flow pump of a hydraulic system under certain operating conditions.
  • a higher gearing between the input control device and the implement would be desirable to allow for faster manipulation of the implement.
  • the procedure of 'bucket shake' is used by operators to reciprocally move the implement back and forth in a shaking movement to promote removal of foreign matter from the implement.
  • low geared hydraulic systems are ill-equipped for this type of manoeuvre.
  • the present disclosure aims to provide an improved hydraulic system, machine and method.
  • a hydraulic system for a machine comprising:
  • the hydraulic system may further comprise a boost valve connected between the load sense input and the ancillary pressure supply which in an open configuration transmits pressure from the ancillary pressure supply to the load sense input, and in a closed configuration blocks transmission of pressure from the ancillary pressure supply to the load sense input.
  • a boost valve connected between the load sense input and the ancillary pressure supply which in an open configuration transmits pressure from the ancillary pressure supply to the load sense input, and in a closed configuration blocks transmission of pressure from the ancillary pressure supply to the load sense input.
  • boost valve to control application of the ancillary boost pressure to the load sense input allows for the boost pressure to be selectively applied. This is a particular benefit where the implement of a machine incorporating the hydraulic system needs to be manipulated differently in different operational modes. For example, for precise manipulation of the implement during digging operations the boost valve can be closed. This could be the normal default setting. For bucket shake manipulation the boost valve could be opened to allow the implement to be vigorously moved back and forth using the boosted output pressure of the hydraulic pump.
  • the system can be configured to provide a permanent boost to the output pressure of the hydraulic pump.
  • the boost valve may be a manually triggered valve.
  • the valve may be an electrically actuated solenoid valve.
  • the valve may be an unregulated valve or a regulated valve.
  • the unregulated valve can act to supply the full ancillary pressure supply pressure to the load sense input on opening of the valve.
  • the regulated valve allows for the whole or a portion of the ancillary pressure supply pressure to be transmitted on to the load sense input.
  • the ancillary pressure supply may be a pilot pressure system.
  • the pilot pressure system may be a dedicated pilot pressure system used only for boosting the present hydraulic system.
  • the pilot pressure system may be a general pilot system of the machine which is utilised for other purposes as well as providing ancillary pressure to the present hydraulic system.
  • the pilot pressure system may be supplied from the high pressure output line and comprises a pressure reduction device for reducing the pressure from the pressure of the high pressure output line to a pilot pressure.
  • the pilot system is pressurised by branching off a pressurised line from the high pressure output of the variable flow pump.
  • the pressure reduction device such as a pressure reducing valve is used to both reduce the absolute pressure from, say, around 228 bar to, say, around 35 bar and also to stabilise the pressure in the pilot pressure system independent of variation of the pressure of the high pressure output of the variable flow hydraulic pump.
  • the present disclosure also provides a machine incorporating a hydraulic system comprising:
  • the machine may be a construction machine and the output device may be a construction implement.
  • the machine may further comprise a boost valve connected between the load sense input and the ancillary pressure supply which in an open configuration transmits pressure from the ancillary pressure supply to the load sense input, and in a closed configuration blocks transmission of pressure from the ancillary pressure supply to the load sense input.
  • a boost valve connected between the load sense input and the ancillary pressure supply which in an open configuration transmits pressure from the ancillary pressure supply to the load sense input, and in a closed configuration blocks transmission of pressure from the ancillary pressure supply to the load sense input.
  • the boost valve may be manually triggered by an operator of the machine by operation of a switching device located in an operator compartment of the machine.
  • the present disclosure also provides a method of controlling a hydraulic system of a machine of the type comprising:
  • the pressure of the load sense line at the load sense input may be boosted by the ancillary pressure supply selectively by operation of a boost valve.
  • the boost valve may be switched by an operator of the machine by operation of a switching device located in an operator compartment of the machine.
  • a hydraulic system of the present disclosure comprises a variable flow hydraulic pump 10, which in use supplies pressurised hydraulic fluid to an implement 17 of a machine such as a large work vehicle, e.g. a construction vehicle such as a back hoe loader.
  • a machine such as a large work vehicle, e.g. a construction vehicle such as a back hoe loader.
  • the pump 15 comprises a low pressure input 14 to which is connected a low pressure input line 11, a high pressure outlet 15 to which is connected a high pressure output line 12 and a load sense input 16 to which is connected a load sense input line 13.
  • the low pressure input line 11 connects to a hydraulic reservoir tank for supplying relatively unpressurised hydraulic fluid to the pump 10.
  • the high pressure output line 12 connects between the pump 10 and the implement 17 of the machine.
  • the load sense line 13 connects between the load sense input 16 and the implement 17 of the machine.
  • an ancillary pressure supply 20 is provided which connects to the load sense line 13.
  • the variable flow hydraulic pump 10 may be of any suitable type and may be, for example, a variable displacement pump such as a swashplate pump.
  • the pump 10 acts to output hydraulic fluid at variable rates and by so doing to raise the pressure of the hydraulic fluid from a relatively low pressure to a relatively high pressure since the high pressure output line 12 is under a load.
  • the required pressure in the high pressure output line 12 necessary to meet the requested hydraulic effort is achieved by varying the flow rate of the pump 10.
  • the variable flow pump 10 may have a maximum rated output pressure of between 220 and 280 bar.
  • the low pressure input line 11, high pressure outlet line 11, high pressure outlet line 12 and load sense line 13 comprise conventional hydraulic conduits such as rigid or flexible hydraulic pipes.
  • the hydraulic system may include other components as well known in the art including for example pressure relief valves (PRVs) and check valves which have been omitted from Figure 1 for reasons of clarity.
  • PRVs pressure relief valves
  • check valves check valves which have been omitted from Figure 1 for reasons of clarity.
  • the implement 17 of the machine may be any required implement that is to be manipulated by hydraulic action. Examples include the hoe bucket of a back hoe loader, front bucket of a back hoe loader, multi-purpose buckets and augers.
  • the ancillary pressure supply 20 may be any suitable pressure supply able to provide an additional pressure source for outputting hydraulic fluid to the load sense line 13.
  • the ancillary pressure supply 20 may be a supplementary hydraulic pump which may be a constant flow pump or a variable flow pump of a similar type to the variable flow hydraulic pump 10 described above.
  • the ancillary pressure supply 20 may be a pilot pressure system of the machine which will be described in further detail below with reference to Figure 3 .
  • variable flow hydraulic pump 10 is driven by a suitable means such as the internal combustion engine of a machine to drive pressurised hydraulic fluid as required to the implement 17.
  • a suitable means such as the internal combustion engine of a machine to drive pressurised hydraulic fluid as required to the implement 17.
  • the flow and hence pressure at the high pressure outlet 15 can be varied.
  • a boost pressure from the ancillary pressure supply 20 is supplied to the load sense line 13 to increase the pressure at the load sense input 16 to thereby result in the flow at the high pressure output 15 being boosted above its normal flow rate. This results in the flow and pressure to the implement 17 being boosted leading to more responsive movement of the implement 17.
  • the ancillary pressure supply 20 may be a regulated or unregulated pressure supply meaning that the ancillary pressure provided by the ancillary pressure supply 20 may be a fixed pressure increment or may be a variable pressure increment.
  • the ancillary pressure supply 20 may be configured to provide an additional boost pressure of, say, 35 bar to the load sense line 13.
  • the ancillary pressure supply 20 may be configured to provide a variable boost pressure of, say, between 0 and 35 bar when actuated.
  • FIG. 2 A variation on the hydraulic system of the present disclosure is shown in Figure 2 .
  • Like components to that of the system of Figure 1 have been referenced with like numerals.
  • the system of Figure 2 differs from that of Figure 1 by the provision of a boost valve 30 between the ancillary pressure supply 20 and the load sense line 13.
  • the boost valve 30 may be any suitable valve device for use with hydraulic fluid and may be for example an electrically actuated solenoid valve.
  • the boost valve 30 can be actuated by a manually operable trigger 40 which may be located, for example, in an operator cab of the machine.
  • the boost valve 30 is used to selectively actuate provision of the ancillary pressure to the load sense line 13.
  • an operator of the machine may choose when to boost hydraulic flow and pressure to the implement 17 by actuating the switch 40 which may be, for example, a button provided on the joystick control input device.
  • the ancillary pressure supply 20 may be a regulated or unregulated pressure supply providing either a fixed increment pressure boost to the load sense line 13 or a variable pressure increment to the load sense line 13 on actuation of the boost valve 30.
  • Figure 3 illustrates a further embodiment of hydraulic system according to the present disclosure.
  • the ancillary pressure supply 20 is illustrated as being provided by a pilot pressure system.
  • the pilot pressure system may be a dedicated pilot pressure system used for only the hydraulic system of the present disclosure or alternatively may be a pilot pressure system which is used for other components or functions of the machine incorporating the hydraulic system of the present disclosure.
  • this possibility is illustrated by provision of a pilot pressure branch line 23 which may be connected to other functions of the machine which fall outside of the scope of the present disclosure.
  • the pressurised working fluid for the pilot pressure system is provided by stemming off high pressure working fluid from the high pressure output line 12 of the variable flow pump 10.
  • This working fluid is branched off using a pilot system input line 21 which connects to a pressure reduction valve 22 which acts to reduce the pressure of the working fluid from the relatively high output pressure of the variable flow pump 10 to a relatively low pilot pressure for use in the pilot pressure system 20.
  • the pressure of such a pilot pressure system will be set at between 22 and 36 bar.
  • the output of the pressure reduction valve is connected to the boost valve 30 which may be of the type as described above with reference to Figure 2 .
  • a check valve 24 may be provided between the boost valve 30 and the connection with the load sense line 13 to prevent back flow of hydraulic fluid.
  • boosting of the hydraulic flow and pressure to the implement 17 is the same or similar to that described above with reference to the system of Figure 2 in that actuation of the boost valve 30 provides additional pressure to the load sense line 13 and hence the load sense input 16 resulting in a boost in the output flow of the pump 10 and increased pressure in the high pressure output line 12.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
EP09252887A 2009-12-23 2009-12-23 Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode Withdrawn EP2339073A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09252887A EP2339073A1 (de) 2009-12-23 2009-12-23 Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09252887A EP2339073A1 (de) 2009-12-23 2009-12-23 Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode

Publications (1)

Publication Number Publication Date
EP2339073A1 true EP2339073A1 (de) 2011-06-29

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EP09252887A Withdrawn EP2339073A1 (de) 2009-12-23 2009-12-23 Hydrauliksystem für eine Maschine, Maschine und Anwendungsmethode

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818732A1 (de) * 2013-06-28 2014-12-31 HAWE Hydraulik SE Verfahren und Steuerung zum hydraulischen Heben einer Last
US11512449B2 (en) 2020-12-14 2022-11-29 Caterpillar Sarl Hydraulic control system and method for a bucket shake operation in a work machine with a hydraulic pump and unloader valve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087968A (en) * 1977-04-28 1978-05-09 Caterpillar Tractor Co. Flow control valve for combining two dissimilar independent systems to a common pressure source
US5067321A (en) 1989-02-23 1991-11-26 Kabushiki Kaisha Kobe Seiko Sho Hydraulic hoisting circuit with electrical control for relief valve adjustment pilot and pilot disable valve
US5481875A (en) * 1991-09-27 1996-01-09 Kabushiki Kaisha Komatsu Seisakusho Apparatus for changing and controlling volume of hydraulic oil in hydraulic excavator
US5939646A (en) 1997-02-26 1999-08-17 Hewlett-Packard Company Sheet media weight detector
DE10134747A1 (de) 2001-07-17 2003-02-13 Liebherr Machines Bulle S A Verfahren und Vorrichtung zur lastabhängigen Steuerung der Fluidversorgung eines Fluidkreises
WO2003068660A1 (en) * 2002-02-11 2003-08-21 Kalmar Industries Sverige Ab A hydraulic system for a vehicle, a vehicle including such a hydraulic system and a suplementary unit for such a vehicle
EP1715193A2 (de) * 2005-04-20 2006-10-25 Volvo Construction Equipment Holding Sweden AB Vorrichtung und Verfahren zur Steuerung der Pumpenfördermenge einer Baumaschine
WO2009067050A1 (en) * 2007-11-21 2009-05-28 Volvo Construction Equipment Ab Load sensing system, working machine comprising the system, and method for controlling a hydraulic function

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087968A (en) * 1977-04-28 1978-05-09 Caterpillar Tractor Co. Flow control valve for combining two dissimilar independent systems to a common pressure source
US5067321A (en) 1989-02-23 1991-11-26 Kabushiki Kaisha Kobe Seiko Sho Hydraulic hoisting circuit with electrical control for relief valve adjustment pilot and pilot disable valve
US5481875A (en) * 1991-09-27 1996-01-09 Kabushiki Kaisha Komatsu Seisakusho Apparatus for changing and controlling volume of hydraulic oil in hydraulic excavator
US5939646A (en) 1997-02-26 1999-08-17 Hewlett-Packard Company Sheet media weight detector
DE10134747A1 (de) 2001-07-17 2003-02-13 Liebherr Machines Bulle S A Verfahren und Vorrichtung zur lastabhängigen Steuerung der Fluidversorgung eines Fluidkreises
WO2003068660A1 (en) * 2002-02-11 2003-08-21 Kalmar Industries Sverige Ab A hydraulic system for a vehicle, a vehicle including such a hydraulic system and a suplementary unit for such a vehicle
EP1715193A2 (de) * 2005-04-20 2006-10-25 Volvo Construction Equipment Holding Sweden AB Vorrichtung und Verfahren zur Steuerung der Pumpenfördermenge einer Baumaschine
WO2009067050A1 (en) * 2007-11-21 2009-05-28 Volvo Construction Equipment Ab Load sensing system, working machine comprising the system, and method for controlling a hydraulic function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818732A1 (de) * 2013-06-28 2014-12-31 HAWE Hydraulik SE Verfahren und Steuerung zum hydraulischen Heben einer Last
US11512449B2 (en) 2020-12-14 2022-11-29 Caterpillar Sarl Hydraulic control system and method for a bucket shake operation in a work machine with a hydraulic pump and unloader valve

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