EP3913232A1 - Hybride hydraulische anordnung für ein arbeitsfahrzeug - Google Patents

Hybride hydraulische anordnung für ein arbeitsfahrzeug Download PDF

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Publication number
EP3913232A1
EP3913232A1 EP21174960.1A EP21174960A EP3913232A1 EP 3913232 A1 EP3913232 A1 EP 3913232A1 EP 21174960 A EP21174960 A EP 21174960A EP 3913232 A1 EP3913232 A1 EP 3913232A1
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EP
European Patent Office
Prior art keywords
module
engine
hybrid
hydraulic arrangement
electric 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.)
Pending
Application number
EP21174960.1A
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English (en)
French (fr)
Inventor
Rosario Aliperti
Francesco PINTORE
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CNH Industrial Italia SpA
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CNH Industrial Italia SpA
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Filing date
Publication date
Application filed by CNH Industrial Italia SpA filed Critical CNH Industrial Italia SpA
Publication of EP3913232A1 publication Critical patent/EP3913232A1/de
Pending legal-status Critical Current

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    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/2075—Control of propulsion units of the hybrid type
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • E02F9/2292—Systems with two or more 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
    • E02F9/2296—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
    • 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
    • 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
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20507—Type of prime mover
    • F15B2211/20523—Internal combustion engine
    • 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
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2654—Control of multiple pressure sources one or more pressure sources having priority
    • 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
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2656—Control of multiple pressure sources by control of the pumps
    • 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
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2658—Control of multiple pressure sources by control of the prime movers
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check valves
    • 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
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply 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
    • F15B2211/633—Electronic controllers using input signals representing a state of the prime mover, e.g. torque or rotational speed
    • 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
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • 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
    • F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the present invention concerns a hybrid hydraulic arrangement, in particular a hybrid hydraulic arrangement for a work vehicle such as agricultural or a construction equipment vehicle.
  • Work vehicles such as agricultural vehicles or construction equipment vehicles use a fluid in pressure, e.g. oil, to operate a plurality of elements of the vehicles, such as transmission, steering, brakes and auxiliary valves.
  • a fluid in pressure e.g. oil
  • a source of such fluid in pressure is generated by at least a pump configured to supply the fluid into a distribution circuit configured to distribute the fluid in pressure among the aforementioned elements in function of their hydraulic load.
  • Such distribution circuit may comprise a so-called priority valve, i.e. a valve configured to subdivide the pressurized oil flow to the different elements of the vehicle and the at least one pump is usually carried by the engine of the vehicle.
  • a priority valve i.e. a valve configured to subdivide the pressurized oil flow to the different elements of the vehicle and the at least one pump is usually carried by the engine of the vehicle.
  • Figure 1 discloses a known hydraulic arrangement 1' configured to generate oil in pressure to feed the hydraulic needs of the work vehicle.
  • such hydraulic arrangement 1' comprises essentially a load sensing pump module 2' and a priority module 3'.
  • the priority module 3' is fluidly connected to pump module 2' to subdivide the oil flow to the different elements of the work vehicle according to load sensing signals, as known in the art.
  • the pump module 2' is mechanically connected to an internal combustion engine (not shown) of the work vehicle, e.g. via a shaft 4'.
  • the pump module 2' comprises at least a pump, in particular two pumps 5', 6' carried by the same shaft 4' operated by the internal combustion engine of the work vehicle.
  • the two pumps 5', 6' are variable displacement pump preferably controlled to vary the angle of their swashplates to modify their flow according to a load sensing signal provide by compensating valves 7', 8' , as per se known.
  • such pumps 5', 6' are configured to start their operation at different pressure level with respect to each other.
  • the first pump 5' is be carried by shaft 4 thereby starting to flow oil towards the priority valve module 3' before the second pump 6'.
  • the second pump 6' represents a passive load for internal combustion engine, while not working, because such second pump 6' is always carried by shaft 4' thereby forcing the internal combustion engine to provide a torque to shaft 4' greater than the torque that will be sufficient to operate only the single pump 5'.
  • the quantity of pressurized oil that can be provided by pump module 2' is low.
  • the quantity of pressurized oil it is therefore necessary to increase the power provided by the internal combustion engine, thereby increasing fuel consumption and consequently costs and pollution linked to the use of the work vehicle.
  • An aim of the present invention is to satisfy the above mentioned needs in a cost effective and optimized way.
  • Figure 2 discloses a hybrid hydraulic arrangement 1 for a work vehicle (not shown) configured to use the power provided by an engine 2 of such work vehicle to provide pressurized oil to different elements of the work vehicle such as a priority valve module 3.
  • the engine 2 is advantageously an internal combustion engine and the priority valve module 3 is configured to subdivide the pressurized oil flow to different hydraulic power modules (e.g. steering, brakes, power beyond modules) of the vehicle and not described in the present application for sake of brevity.
  • different hydraulic power modules e.g. steering, brakes, power beyond modules
  • the hydraulic arrangement 1 comprises hydro-mechanic module 4 and a hybrid module 5 each separately mechanically coupled to the engine 2 and both fluidly connected together to priority valve module 3 as detailed below.
  • the hydro-mechanic module 4 comprises a variable displacement pump 6 and a compensator module 7 configured to vary the pressure of the flow pumped by such variable displacement pump 6.
  • This latter is mechanically coupled to engine 2, e.g. via a dedicated shaft 8.
  • Variable displacement pump 6 comprises an inlet 6a fluidly connected to a source of oil 9 and an outlet 6b fluidly connected to priority valve module 3 via a conduit 11.
  • Variable displacement pump 6 is configured to increase the pressure of the aspired oil to a preset value between the inlet 6a and the outlet 6b.
  • the compensator module 7 comprise valve means 12 configured to regulate the flow of a hydraulic signal 13 spilled by conduit 11 downstream to pump 6.
  • Such hydraulic signal 13 is used to control a swashplate control piston 14 configured to vary the angle of the swash plates of the pump 6 between a minimum and a maximum value.
  • the disclosed embodiment comprises two proportional valves 12', 12" as valve means 12.
  • the quantity of oil sent to swashplate control piston 14, i.e. configured to vary the flow pressure provided by pump 6 is regulated by moving valves 12', 12'' e.g. by varying the stiffness of elastic means 15 configured to maintain the valves 12', 12'' in a first set position.
  • valves 12', 12" are furthermore fluidly connected to discharge 16 and that swashplate control piston 14 is itself connected to both valves 12', 12" and to discharge 16.
  • the hybrid module 5 comprises a fixed displacement pump 20 and a motor/generator module 21 operationally interposed between the engine 2 and the fixed displacement pump 20 to use apportion of the torque provided by engine 2 to operate fixed displacement pump 20.
  • motor/generator module 21 comprises essentially a generator 22 mechanically coupled to engine 2 and a motor 23 mechanically coupled to pump 20 and electrically coupled to generator 22.
  • the motor/generator module 21 comprises an electronic control unit 24 electrically connected to both the generator 22 and the motor 23 and accumulator means 25 electrically connected to both the generator 22 and the motor 23.
  • the electronic control unit 24 is configured to control the operation of the generator 22 and of motor 23 according to the operation of the work vehicle and the accumulator means 25 are configured to store the electrical energy provided by generator 22 so as to be used by motor 23, if needed, in addition or in substitution of the action of generator 22.
  • Accumulator means 25 may comprise a battery and/or an inverter or equivalent devices.
  • the generator 22 is mechanically coupled to shaft 8 via a mechanical transmission unit 26, preferably comprising a gearing 27 configured to define a transmission ratio between shaft 8 and an input shaft 28 coupled to generator 22.
  • gearing 27 comprises a first gear 27' carried by shaft 8 configured to cooperated with a second gear 27" carried by input shaft 28. It is clear that further gearing may be provided instead of the above described, such as a planetary gearing.
  • the pump 20 is operated thanks to an output shaft 29 connecting the pump 20 to the motor 23.
  • such connection is a direct connection, however it may be envisaged a transmission unit or a decoupling unit between the motor 23 and the pump 20 to adjust in the most optimized way the transmission of torque between motor 23 and pump 20.
  • Fixed displacement pump 20 comprises an inlet 20a fluidly connected to a source of oil 9 and an outlet 20b fluidly connected to priority valve module 3 via a conduit 31.
  • Pump 20 is configured to increase the pressure of the aspired oil to a preset between the inlet 20a and the outlet 20b, thereby increasing the maximum flow directed to priority valve module 3.
  • Conduit 31 is fluidly connected to priority valve module 3, preferably by a fluidly connection with conduit 11 and hydraulic circuit 1 can further comprises a check valve 32 configured to allow the motion of fluid only from pump 20 towards priority valve module 3.
  • motor 23 is controlled by electronic unit 24 that is configured to receive a plurality of electric signals representing different quantities related to the operation of the wok vehicle to consequently control the motor 23.
  • the electronic control unit 24 comprises elaboration means configured to elaborate the electric signals to provide a suitable control signal for managing the operation of motor 23.
  • Such electric signals are generated by a plurality of sensor means configured to detect quantities related to the operation of the work vehicle.
  • Such electric signals may also be input signals representative of an operational condition requested by the user, e.g. thanks to a joystick, for requesting a particular operation that involves the use of hydraulic actuators.
  • the hydraulic arrangement 1 essentially comprises:
  • hydraulic arrangement 1 can furthermore comprise the following sensor means:
  • the electronic control unit 24 is electrically connected to accumulator means 25 to detect the their threshold of charge.
  • the electric connection of electronic control unit 24 with the aforementioned elements may be realized by wire or wireless thanks to electromagnetic signals.
  • variable displacement pump 6 pumps fluid towards priority valve module 3.
  • Such condition may be representative of an operational condition of work vehicle 1 in which the engine 2 provide sufficient power to provide the oil thanks to only variable displacement pump 6.
  • engine 2 provides torque to shaft 8 that starts rotate thereby leading pump 6 to aspire oil from source 9 and direct the latter, pressurized, to the priority mode. Thanks to check valve 32, such oil cannot flow via conduit 31 towards pump 20.
  • the swashplate angle of the pump 6 is regulated via hydraulic signal 13, spilled downstream to pump 6, and compensator module 7. A portion of the torque provided by the engine 2 to shaft 8 is transferred via gearing 27 to input shaft 28 and then to generator 22 that recharges the accumulator means 25.
  • both pumps 6 and 20 pump fluid towards priority valve module 3.
  • engine 2 provides torque to shaft 8 that starts rotate thereby leading pump 6 to aspire oil from source 9 and direct the latter, pressurized, to the priority valve module 3.
  • the swashplate angle of the pump 6 is regulated via hydraulic signal 13, spilled downstream to pump 6, and compensator module 7.
  • a portion of the torque provided by the engine 2 to shaft 8 is transferred via gearing 27 to input shaft 28 and then to generator 22 that recharges the accumulator means 25.
  • the control unit 24 controls motor 23 that used the power stored in accumulator means 25 to make rotating shaft 29 thereby leading pump 20 that aspires oil from source 9 and direct the latter, pressurized, to the priority valve module 3.
  • Such condition may be representative of a plurality operational condition of work vehicle 1 as detailed below.
  • the flow that can be provided by pump 6, directly linked to shaft 8 rotation is at a value that is proportional to the shaft 8 speed. Since the engine 2 is at idle, the shaft 8 speed is at minimum and therefore the flow that can be provided by pump 6 is minimum, as regulated by compensator module 7. If the user requests a particular operation that involves the use of a hydraulic actuator, e.g. via a joystick of the work vehicle, the electronic unit 24 elaborates such input signal provided by the user to determine the amount of oil needed at priority valve module 3. The electronic unit 24, thanks to pressure signal on conduit 11 and the knowledge of engine speed, can estimate the oil flow currently provided by pump 6 and estimate a difference with respect to the requested flow by the user.
  • the electronic unit 24 controls motor 23 to make rotate input shaft 29 thereby allowing pump 20 to provide an oil flow corresponding to such difference. In this way, even if the engine 2 is at idle, the work vehicle is provided with a sufficient quantity of oil without need of increasing engine 2 speed.
  • the flow that can be provided by pump 6, directly linked to shaft 8 rotation is at a value that is proportional to the shaft 8 speed. Since the engine 2 is at its maximum speed, the shaft 8 speed is maximal and therefore the flow that can be provided by pump 6 is maximum, as regulated by compensator module 7. If the user requests a particular operation that involves the use of a hydraulic actuator, e.g. via a joystick of the work vehicle, the electronic unit 24 elaborates such input signal provided by the user to determine the amount of oil needed at priority valve module 3. The electronic unit 24, thanks to pressure signal on conduit 11 and the knowledge of engine speed, can estimate the oil flow currently provided by pump 6 and estimate a difference with respect to the requested flow by the user.
  • the electronic unit 24 controls motor 23 to make rotate input shaft 29 thereby allowing pump 20 to provide an oil flow corresponding to such difference. In this way, even if the engine 2 is at maximum, the work vehicle is provided with a further quantity of oil.
  • the flow that can be provided by pump 6, directly linked to shaft 8 rotation is at a value that is proportional to the shaft 8 speed. Since the engine 2 is an intermediate speed, the flow that can be provided by pump 6 is comprised between its minimum and maximum value, as regulated by compensator module 7. If the user requests a particular operation that involves the use of a hydraulic actuator, e.g. via a joystick of the work vehicle, the electronic unit 24 elaborates such input signal provided by the user to determine the amount of oil needed at priority valve module 3. The electronic unit 24, thanks to pressure signal on conduit 11 and the knowledge of engine speed, can estimate the oil flow currently provided by pump 6 and estimate a difference with respect to the requested flow by the user. Therefore, knowing such difference of oil flow, the electronic unit 24 controls motor 23 to make rotate input shaft 29 thereby allowing pump 20 to provide an oil flow corresponding to such difference.
  • the torque provided by motor 23 is optimized to minimize the load imparted to engine 2 from pump 20, i.e. to maximize the efficiency of pump 20.
  • the torque provided by motor 23 is optimized to allow the operation of engine 2 at its maximum efficiency condition, notwithstanding the efficiency of pump 20.
  • the torque provided by motor 23 is optimized to reach a point maximizing both the efficiency of pump 20 and engine 2.
  • Such condition may be representative of an operational condition of work vehicle 1 into which the requested oil flow is minimal and it could be worth not using/activating engine 2.
  • engine 2 is disconnected to provide torque to shaft 8 or off and the control unit 24 controls motor 23 that used the power stored in accumulator means 25 to make rotating shaft 29 thereby leading pump 20 that aspires oil from source 9 and direct the latter, pressurized, to the priority valve module 3.
  • the present invention also relates to a method for providing pressurized oil flow to a priority valve module 3 of a work vehicle thanks to the above hydraulic arrangement 1 comprising the following steps:
  • the step of controlling electric motor 23 may comprise an optimization step, preferably a minimization of the load due to fixed displacement pump 20, i.e. the maximization of its efficiency, and/or a maximization of the efficiency of engine 2.
  • the aforementioned steps of the method can be executed thanks to a computer program memorized in the electronic control unit 24.
  • the flow of pressurized oil that can be provided at the priority module 3 is no more strictly linked to the engine 2 speed. Indeed, as demonstrated above, a plurality of different mode of control of electric motor 23 allows to achieve different oil flow condition at priority valve module 3 independently with respect to engine 2 condition.
  • the pump 6, 20 may be of any size, typology and in greater number. Similar consideration may be applied to compensator module 7, transmission module 26 or motor/generator module 21.
  • control law can apply different mathematical relationships to control electric motor 23.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Fluid-Pressure Circuits (AREA)
EP21174960.1A 2020-05-20 2021-05-20 Hybride hydraulische anordnung für ein arbeitsfahrzeug Pending EP3913232A1 (de)

Applications Claiming Priority (1)

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IT102020000011782A IT202000011782A1 (it) 2020-05-20 2020-05-20 Disposizione idraulica ibrida per veicolo da lavoro

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1790781A1 (de) * 2005-06-02 2007-05-30 Shin Caterpillar Mitsubishi Ltd. Arbeitsmaschine
JP2011190072A (ja) * 2010-03-16 2011-09-29 Kobe Steel Ltd 作業用車両
JP2012013203A (ja) * 2010-07-05 2012-01-19 Kobelco Cranes Co Ltd 作業機械の駆動装置
US20180038079A1 (en) * 2015-06-02 2018-02-08 Hitachi Construction Machinery Co., Ltd. Hydraulic Drive System of Work Machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1790781A1 (de) * 2005-06-02 2007-05-30 Shin Caterpillar Mitsubishi Ltd. Arbeitsmaschine
JP2011190072A (ja) * 2010-03-16 2011-09-29 Kobe Steel Ltd 作業用車両
JP2012013203A (ja) * 2010-07-05 2012-01-19 Kobelco Cranes Co Ltd 作業機械の駆動装置
US20180038079A1 (en) * 2015-06-02 2018-02-08 Hitachi Construction Machinery Co., Ltd. Hydraulic Drive System of Work Machine

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