EP2310692A1 - Flusssteuerung - Google Patents

Flusssteuerung

Info

Publication number
EP2310692A1
EP2310692A1 EP09772437A EP09772437A EP2310692A1 EP 2310692 A1 EP2310692 A1 EP 2310692A1 EP 09772437 A EP09772437 A EP 09772437A EP 09772437 A EP09772437 A EP 09772437A EP 2310692 A1 EP2310692 A1 EP 2310692A1
Authority
EP
European Patent Office
Prior art keywords
oil
bypass
flow
cooling
cooler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09772437A
Other languages
English (en)
French (fr)
Other versions
EP2310692B1 (de
Inventor
Richard Heindl
Andreas Brockmann
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.)
AGCO GmbH and Co
Original Assignee
AGCO GmbH and Co
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 AGCO GmbH and Co filed Critical AGCO GmbH and Co
Publication of EP2310692A1 publication Critical patent/EP2310692A1/de
Application granted granted Critical
Publication of EP2310692B1 publication Critical patent/EP2310692B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0423—Cooling
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/62—Cooling or heating 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
    • F15B2211/60—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
    • 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
    • F15B2211/6343—Electronic controllers using input signals representing a temperature
    • 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
    • F15B2211/6654—Flow rate control

Definitions

  • the invention relates to a device for controlling the flow of oil through an oil cooler.
  • the invention relates to such a device for use on vehicles, such as agricultural machines.
  • FIG. 1 by way of example shows a block diagram of working or transmission hydraulics, as are usual in mobile machines.
  • An oil tank 1 holds a volume of oil.
  • An oil-air cooler 4 is arranged in front of this.
  • This cooler 4 has a bypass valve 5 connected in parallel.
  • the actual circuit of the vehicle can vary greatly depending upon the scope of application and is simply represented by symbol 6.
  • An oil pump 7 with constant displacement is used for supplying the circuit 6.
  • Other pumps with constant or variable displacement can also be used in addition to this pump. If only one pump is used, usually this works with constant displacement.
  • a sensor 8 is provided for determining the dynamic pressure.
  • the bypass valve 5 connected in parallel has a spring tension of 5 bar for example.
  • valve 5 represents a simple and reliable means of protection for the cooler 4.
  • a disadvantage of this arrangement is that even at low oil temperatures oil always flows through the cooler 4.
  • the constant, actually unwanted, cooling of the oil at low temperatures is a side effect of this arrangement. It stems from the fact that oil warms up relatively slowly. Slow warming of the oil produces losses of efficiency and can also result in malfunction of valves or cavitation in pumps.
  • the disadvantages mentioned occur even if an oil-oil heat exchanger or an oil-water heat exchanger is used instead of the oil-air cooler 4.
  • outside air is not used as cooling agent for the cooling medium but a second oil. This oil originates from another oil circuit and, as cooling agent, has a lower temperature than the medium to be cooled.
  • Fig. 2 shows an alternative embodiment to Fig. 1.
  • the bypass valve 5 has been replaced by a thermostatically-controlled oil temperature regulator OETR 5.
  • the OETR 5 has as many intermediate positions as desired. In position a, the OETR 5 opens a bypass branch 9 to the tank 1 and completely closes the inflow 10 to the cooler 4. This position is assumed at low temperatures.
  • An expanding material element 17 which is provided on one side of the OETR 5 ensures that in the basic setting the OETR 5 assumes a position, wherein the entire oil is directed via the bypass branch 9, is provided on one side of the OETR 5. The expanding material element 17 expands when the oil temperature rises.
  • the disadvantage of this circuitry is that the OETR 5 represents a comparatively large and expensive component.
  • the total amount of oil must always flow through the OETR and the oil reacts relatively sluggishly to changes in temperature.
  • the switching response cannot be influenced, for example to adapt to different operating conditions.
  • the disadvantages mentioned occur even if an oil-oil heat exchanger or an oil-water heat exchanger is used instead of the oil-air cooler 4.
  • a device for controlling the flow through an oil cooler comprising at least one oil tank, at least one oil pump, an oil temperature measurement means for determining the oil temperature, a cooling means for cooling the oil and an engine control unit wherein said cooling means can be circumvented via a bypass and the device has a flow control means controllable by the engine control unit to control the oil flow through the cooling means and/or via the bypass, characterised in that the device has a predictive means for predictively controlling the oil flow via the cooling means and/or via the bypass.
  • predictive means the prognostic control of the oil flow.
  • Such control prevents temperature spikes in the oil, which can develop if a circuit reacts too slowly to a rise in temperature.
  • Predictive control for example can be implemented by data determined by a temperature sensor being passed onto an engine control unit and evaluated by this.
  • the oil temperature in this case is used as a control variable of a characteristic diagram.
  • the engine control unit Based on this the engine control unit continually calculates a temperature gradient, that is to say the temperature rise or temperature fall is continually monitored over time. If a high temperature gradient is detected, a higher cooling capacity demand results in order to prevent the permissible limit temperature of the oil from being exceeded. By closing the means for controlling the oil flow, a larger quantity of oil is fed to the cooler and thus the cooling capacity is increased.
  • a method for controlling the oil temperature in a device comprising the following steps:
  • Determination of the oil temperature by oil temperature measurement means transmission of the determined values to the engine control unit, computation of the cooling capacity demand, control of the oil flow via the cooling means and/or via the bypass, wherein the control takes place via the flow control means, characterised in that the method is carried out predictively.
  • the flow control device has a control means controllable via the engine control unit for controlling the oil flow through the cooling means and/or via the bypass.
  • the cooler is substantially better protected from damage. This is attributed to the fact that in operation the internal pressure is always less than the bursting pressure. Furthermore warming of the oil is substantially accelerated due to the fact that the bypass branch can be kept open for a long time.
  • a further advantage is that the dynamic pressures before the cooler, which are usually known to be high can be avoided. This is important to the extent that the high dynamic pressures can have disadvantageous functional effects on the operation of the hydraulic system.
  • the flow control means controllable via the engine control unit is a proportional throttle valve and/or an on-off valve and/or a hydraulic check valve. It has also been proved advantageous to control the engine speed from the engine control unit, since the delivery of the pump is proportional to the engine speed. In the event that the drive speed of the pump falls and the oil temperature rises at the same time this form of control is particularly advantageous. This operational case is to be found quite frequently in working hydraulics since high energy loss and rising oil temperatures occur at average engine speeds. In the case of falling engine speeds and reduced output from the pump, the cooling capacity of the oil cooler reduces, although due to rising oil temperature a higher cooling capacity demand is present.
  • the means for cooling the oil temperature is an oil-air cooler and/or an oil-oil heat exchanger and/or an oil-water heat exchanger.
  • the flow control device has a reflux filter.
  • this reflux filter can be freely circumvented via a bypass valve.
  • the device in a preferred embodiment, has two separate circuits for the working and transmission hydraulics.
  • Fig. 1 is a flow control device in the prior art
  • Fig. 2 is another flow control device in the prior art
  • Fig. 3 is a preferred embodiment of the invention
  • Fig. 4 is a further preferred embodiment, in which the controllable means is an on-off valve
  • Fig. 5 is a further embodiment, in which a hydraulic check valve is used
  • Fig. 6 is a further embodiment of the invention, in which the circuits for the working and transmission hydraulics are separate;
  • Fig. 7 is a further preferred embodiment;
  • Fig. 8 is an embodiment, in which the circuit has been simplified.
  • Fig. 3 shows a preferred embodiment of a flow control device through which oil from an oil tank 1 flows.
  • the device has a flow control means 11, with as many intermediate positions as desired, for controlling the oil flow.
  • a temperature sensor 12 which is present in the system, continuously measures the oil temperature in the inflow 10 of the cooler 4 and transmits this to an engine control unit (ECU) 13.
  • the engine control unit 13 has an output, which can be a pulse-width-modulation (PWM) output which activates an oil flow control means 11. If the oil is cold there is no activation of the oil flow control means; thus the bypass branch 9 is completely open in operating position a.
  • PWM pulse-width-modulation
  • the oil flow control means 11 When the oil temperature increases the oil flow control means 11 is activated, to operating position b directing a portion of the oil flow, dependent upon the level of increase in the oil temperature, to the cooler inflow 10 and the remaining portion to the bypass branch 9. With higher oil temperatures and demands for higher cooling capacity the oil flow control means 11 is completely closed, to operating position c, and the entire oil flow is directed to the cooler 4.
  • a characteristic diagram which is based on measurements or calculations can be programmed in the engine control unit 13.
  • the operator can close the oil flow control means 11 by switching an emergency manual control d and thus ensure cooling.
  • Fig. 4 shows a further preferred embodiment of the flow control device.
  • a 2/2 on-off valve is used as oil flow control means 11.
  • oil flow control means 11 instead of having as many intermediate positions as desired only the two fixed operating positions c and a are provided.
  • Fig. 3 are also valid for Fig. 4 with the difference that on and off switching of the cooler 4 takes place without intermediate steps.
  • Fig. 5 shows a further preferred embodiment of the flow control device.
  • This preferred embodiment as the oil flow control means 11 , has an electrically-operated check valve 11.
  • This check valve by way of example has a response pressure of 5 bar.
  • the check valve 11 is opened by an electric current, directing the oil flow to the bypass 9 and ensuring that the cooling capacity is reduced, in order to guarantee fast oil warming.
  • the check valve 11 changes to the bypass position a and therefore ensures that the bypass 9 is opened and the cooler 4 does not suffer damage in cold weather starting conditions.
  • the fail safe function of the means 11 fulfils both the requirement to limit the cooler internal pressure and providing the cooling capacity, without making additional emergency hand operation necessary.
  • Fig. 6 shows a preferred embodiment, in which the circuit for the working and transmission hydraulics are separate.
  • An oil pump 7a with constant displacement draws from a tank Ia and feeds the working hydraulics circuit 6a.
  • the working hydraulics ciruit 6a can also be supplied by further pumps not illustrated here. In this case only further circuitry of the working hydraulics circuit 6a is fed by the pump 7a.
  • the flow control means 11a which is connected in parallel to a heat exchanger 14 is located in the further circuitry.
  • An oil pump 7b with constant displacement draws from a tank Ib and feeds the hydraulic system 6b.
  • the transmission hydraulic system 6b can also be supplied by further pumps, not illustrated here. Of significance here is that the further circuitry of the transmission hydraulics 6b is only fed by pump 7b.
  • a cooling means 4 which is protected by the parallel-connected means lie is located in the further circuitry.
  • the second side of the heat exchanger 14 is located in the further circuitry of the cooler 4.
  • the heat exchanger 14 can be of a plate or of a tube bundle construction.
  • the heat exchanger 14 is designed to transfer the heat energy of the oil circuit at the higher temperature to the circuit at the lower temperature.
  • the temperatures of the transmission oil circuit 6b are measured by the temperature sensors 12b and 12c, the temperature of the working hydraulic system 6a being measured by the temperature sensor 12a.
  • the sensors 12a, 12b and 12c are connected to the engine control unit 13, so that the flow control means 11a, l ib and l ie are activated.
  • each of the individual coolers has an element to control the temperature and to control the cooling capacity.
  • the advantages of the cooler control therefore have an effect in each of the individual circuits.
  • the temperature at sensor 12c rises above a certain level, it is necessary to dissipate heat energy from the vehicle into the environment. This takes place by energizing the flow control means l ie. By specifi activation of the flow control means l ie the cooling capacity of the cooling means can be regulated within certain limits.
  • the flow control means 1 Ic and 1 Ib are opened.
  • the oil in circuit 6a remains at a low temperature for a long time if the working hydraulics 6a are not running, as is usual in the case of road travel. This is particularly the case if circuit 6a is equipped with one or more variable pumps (not illustrated).
  • the flow control means 11a is activated and closed, and the medium to be warmed up in circuit 6a is directed to the heat exchanger 14.
  • the temperature in the circuit 6a rises and the temperature in the circuit 6b falls.
  • This heat transfer has the consequence that the temperature in the circuit 6b reduces and the oil in circuit 6a warms up.
  • the heating of the oil in circuit 6a reduces the likelihood of cavities forming in the pumps in circuit 6a.
  • the switching times of the solenoid valves in circuit 6a are reduced, and their operational reliability improved.
  • Fig. 7 shows a further preferred embodiment of the invention.
  • the flow control means 1 Ic has been replaced by the check valve 16.
  • the check valve 16 takes over the function of protecting the cooler 4 from too high internal pressure and indirectly takes over the flow control and thus the cooling performance.
  • Fig. 8 shows a further preferred embodiment of the invention.
  • the flow control means 1 Ib and 1 Ic from Fig. 6 or 1 Ib and the check valve 16 from Fig. 7 are replaced by a single control means 1 Ib, in order to reduce the component complexity and the costs.
  • heat energy can be transferred in a controlled way from circuit 6a to 6b and from circuit 6b to circuit 6a.
  • the circuit according to Fig. 8 does not offer the possibility of separating the control for the performance of cooler 4 from the control for the performance of heat exchanger 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Details Of Gearings (AREA)
  • Fluid-Pressure Circuits (AREA)
EP09772437A 2008-06-30 2009-06-30 Flusssteuerung Active EP2310692B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008030969A DE102008030969A1 (de) 2008-06-30 2008-06-30 Durchflusssteuerung
PCT/EP2009/058181 WO2010000737A1 (en) 2008-06-30 2009-06-30 Flow control

Publications (2)

Publication Number Publication Date
EP2310692A1 true EP2310692A1 (de) 2011-04-20
EP2310692B1 EP2310692B1 (de) 2012-10-24

Family

ID=41100737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09772437A Active EP2310692B1 (de) 2008-06-30 2009-06-30 Flusssteuerung

Country Status (4)

Country Link
US (1) US20110132012A1 (de)
EP (1) EP2310692B1 (de)
DE (1) DE102008030969A1 (de)
WO (1) WO2010000737A1 (de)

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JP5954360B2 (ja) * 2014-06-09 2016-07-20 コベルコ建機株式会社 建設機械
CN105526155B (zh) * 2014-09-30 2018-03-02 中联重科股份有限公司 闭式液压泵测试系统温度控制方法、设备以及系统
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DE102017101090A1 (de) * 2017-01-20 2018-07-26 Man Diesel & Turbo Se Ölversorgungssystem und Verfahren zum Betreiben desselben
DE102017201225A1 (de) 2017-01-26 2018-07-26 Zf Friedrichshafen Ag Verfahren zum Betreiben eines Hydrauliksystems mit einem ersten Schaltventil, mit einem zweiten Schaltventil und mit einem Druckfilter
CN115135859A (zh) * 2020-03-16 2022-09-30 沃尔沃卡车集团 用于控制润滑系统的控制方法、控制器和控制程序、承载控制程序的计算机可读介质、润滑系统和车辆
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Also Published As

Publication number Publication date
US20110132012A1 (en) 2011-06-09
WO2010000737A1 (en) 2010-01-07
EP2310692B1 (de) 2012-10-24
DE102008030969A1 (de) 2009-12-31

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