US20110132012A1 - Flow control - Google Patents
Flow control Download PDFInfo
- Publication number
- US20110132012A1 US20110132012A1 US13/001,638 US200913001638A US2011132012A1 US 20110132012 A1 US20110132012 A1 US 20110132012A1 US 200913001638 A US200913001638 A US 200913001638A US 2011132012 A1 US2011132012 A1 US 2011132012A1
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- US
- United States
- Prior art keywords
- oil
- cooler
- heat exchanger
- circuit
- bypass
- 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.)
- Abandoned
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Classifications
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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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
- 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
- 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.
- the flow control device has a reflux filter.
- this reflux filter can be freely circumvented via a bypass valve.
- FIG. 1 is a flow control device in the prior art
- FIG. 6 is a further embodiment of the invention, in which the circuits for the working and transmission hydraulics are separate;
- the flow control means 11 a is activated and closed, and the medium to be warmed up in circuit 6 a is directed to the heat exchanger 14 .
- the temperature in the circuit 6 a rises and the temperature in the circuit 6 b falls.
- This heat transfer has the consequence that the temperature in the circuit 6 b reduces and the oil in circuit 6 a warms up.
- the heating of the oil in circuit 6 a reduces the likelihood of cavities forming in the pumps in circuit 6 a .
- FIG. 7 shows a further preferred embodiment of the invention.
- the flow control means 11 c 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.
Abstract
The present invention relates to a device for controlling the flow through an oil cooler, comprising at least one oil tank (1) and at least one oil pump (7), a means (12) for determining the oil temperature, a cooling means (4) for cooling the oil, wherein said means (4) can be circumvented via a bypass (9), as well as an engine control unit (13). The device has a means (11), controllable via the engine control unit (13) by which the oil flow can be controlled via the means for cooling (4) and/or via the bypass (9). The device further comprises a means for predictively controlling the oil flow via the cooling means (4) and/or via the bypass (9).
Description
- The invention relates to a device for controlling the flow of oil through an oil cooler. In particular the invention relates to such a device for use on vehicles, such as agricultural machines.
- Devices for controlling the flow of oil through an oil cooler are known.
FIG. 1 by way of example shows a block diagram of working or transmission hydraulics, as are usual in mobile machines. Anoil tank 1 holds a volume of oil. An oil-air cooler 4 is arranged in front of this. This cooler 4 has abypass valve 5 connected in parallel. The actual circuit of the vehicle can vary greatly depending upon the scope of application and is simply represented bysymbol 6. Anoil pump 7 with constant displacement is used for supplying thecircuit 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. In front of the cooler 4 asensor 8 is provided for determining the dynamic pressure. Thebypass valve 5 connected in parallel has a spring tension of 5 bar for example. The parallel connection of thebypass valve 5 ensures that a maximum decrease in pressure of 5 bar can occur over the cooler 4. Consequently the cooler 4 is protected from too high internal pressures, which could exceed the permissible bursting pressure. Thusvalve 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. In an oil-oil heat exchanger, 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.
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FIG. 2 shows an alternative embodiment toFIG. 1 . In this case thebypass 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 abypass branch 9 to thetank 1 and completely closes theinflow 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 thebypass branch 9, is provided on one side of the OETR 5. The expanding material element 17 expands when the oil temperature rises. As a result of the expansion of the expanding material element 17 against a spring 5 a the valve moves to operating position b, thus gradually releasing the oil flow to the cooler 4 and gradually closing the flow to thebypass 9 for the cooler 4. In operating position b the oil flows both via thebypass branch 9 and via thecooler inflow 10. With increasing oil temperature the valve moves to operating position c, the oil now flowing completely to the cooler 4 in order to reach a high cooling capacity. The passage to thebypass branch 9 is blocked. - 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. Furthermore 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.
- On this basis it is an object of the present invention to avoid the disadvantages of the aforementioned flow control devices in a simple and economical way. According to one aspect of the invention there is provided 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.
- In this case 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. 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.
- According to a further aspect of the invention there is provided a method for controlling the oil temperature in a device, comprising the following steps:
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- 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.
- Thus, a substantial improvement is obtained in relation to the prior art. 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.
- In a preferred embodiment 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. As a result of the preferred embodiment the possibility now exists of closing the means for controlling the oil flow further and of increasing the oil flow to the cooler despite falling engine speed. Thus the reduction in the oil flow through the cooler can be compensated by closing the bypass valve more powerfully and thus achieving a higher cooling capacity. The advantages mentioned occur even if an oil-oil heat exchanger or an oil-water heat exchanger is used in place of the oil-air cooler.
- In a further advantageous embodiment of the invention 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.
- Additionally it has proved advantageous if the flow control device has a reflux filter. In this case it is of particular advantage if this reflux filter can be freely circumvented via a bypass valve.
- It has also proved particularly advantageous if the device, in a preferred embodiment, has two separate circuits for the working and transmission hydraulics.
- Of really special preference in this case is a vehicle, in particular a tractor, which comprises a device in accordance with the above description.
- The invention will now be described, by way of example only, with reference to the following drawings in which:
-
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; and -
FIG. 8 is an embodiment, in which the circuit has been simplified. - In the following explanations the reference symbols designate the same or comparable parts.
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FIG. 3 shows a preferred embodiment of a flow control device through which oil from anoil tank 1 flows. The device has a flow control means 11, with as many intermediate positions as desired, for controlling the oil flow. Atemperature sensor 12, which is present in the system, continuously measures the oil temperature in theinflow 10 of the cooler 4 and transmits this to an engine control unit (ECU) 13. Theengine 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 thebypass branch 9 is completely open in operating position a. The component cooler 4 comprising the valve and the pipes is designed such that none or only very little oil flows over the cooler 4. 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 thecooler inflow 10 and the remaining portion to thebypass 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 theengine control unit 13. - Here the following applies:
-
Q ges =Q BP +Q K -
Q BP =f(I) -
Q ges =f(n) -
Q K =Q ges −Q BP - wherein:
Ges=entire,
BP=bypass,
K=cooler,
I=current and
n=engine speed. - From this it can be derived what current (I) is necessary, in order for a given oil temperature and engine speed (n) to direct a certain oil flow to the cooler, so as to obtain a certain cooling capacity. In the event of power failure or cable break the oil flow control means 11 changes to the bypass position a and therefore it is guaranteed that the
bypass 9 is opened, and in cold weather starting conditions the cooler 4 suffers no damage. In the event of an error, for example, a cable break or short-circuit in the electrical connection betweenengine control unit 13 and oil flow control means 11, 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. In this embodiment a 2/2 on-off valve is used as 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. The advantages specified inFIG. 3 are also valid forFIG. 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-operatedcheck valve 11. This check valve by way of example has a response pressure of 5 bar. Thecheck valve 11 is opened by an electric current, directing the oil flow to thebypass 9 and ensuring that the cooling capacity is reduced, in order to guarantee fast oil warming. In the event of power failure or a cable break, thecheck valve 11 changes to the bypass position a and therefore ensures that thebypass 9 is opened and the cooler 4 does not suffer damage in cold weather starting conditions. As an advantage of this embodiment it is mentioned that the fail safe function of themeans 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 7 a with constant displacement draws from a tank 1 a and feeds the working hydraulics circuit 6 a. The working hydraulics circuit 6 a can also be supplied by further pumps not illustrated here. In this case only further circuitry of the working hydraulics circuit 6 a is fed by the pump 7 a. The flow control means 11 a which is connected in parallel to aheat exchanger 14 is located in the further circuitry. Anoil pump 7 b with constant displacement draws from a tank 1 b and feeds the hydraulic system 6 b. The transmission hydraulic system 6 b can also be supplied by further pumps, not illustrated here. Of significance here is that the further circuitry of the transmission hydraulics 6 b is only fed bypump 7 b. A cooling means 4 which is protected by the parallel-connected means 11 c is located in the further circuitry. The second side of theheat exchanger 14 is located in the further circuitry of the cooler 4. Theheat exchanger 14 can be of a plate or of a tube bundle construction. Theheat 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 6 b are measured by thetemperature sensors 12 b and 12 c, the temperature of the working hydraulic system 6 a being measured by the temperature sensor 12 a. Thesensors 12 a, 12 b and 12 c are connected to theengine control unit 13, so that the flow control means 11 a, 11 b and 11 c are activated. Thus 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. - If a vehicle is started in the cold and while standing or during slow journeys delivers high hydraulic power, this can lead to the fact that the oil temperature in the working hydraulic system 6 a rises very quickly and the oil temperature in the transmission oil circuit 6 b remains low. For certain groups of vehicles such as agricultural tractors this is a typical case of operation. The flow control means 11 a in the working hydraulic system would be fully activated and closed, since a high temperature is registered in the working hydraulic system 6 a and a high cooling capacity should be obtained. The flow control means 11 b and 11 c are now not activated and open, since a low temperature is registered in the transmission oil circuit 6 b and the oil is directed to the cooling means 4 and to the
heat exchanger 14. Since no cooling agent flows through theheat exchanger 14, the oil in the working hydraulic system 6 a is not cooled and there is a danger of overheating. This problem is solved by the preferred embodiment in the following way: above a certain temperature difference betweentemperature sensors 12 a and 12 b, the flow control means 11 b is closed by energisation and the cooling agent is directed to theheat exchanger 14. As a result the temperature in the circuit 6 a falls and the temperature in the circuit 6 b rises. This heat transfer has the consequence that circuit 6 a is protected from overheating and the circuit 6 b is warmed up. The heating of the oil in circuit 6 b improves the efficiency in circuit 6 b. Thus fuel consumption is reduced, whenever the vehicle starts to move after stationary operation. If the temperature at sensor 12 c 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 11 c. By specific activation of the flow control means 11 c the cooling capacity of the cooling means can be regulated within certain limits. In the event that the transmission oil becomes hot due to fast road travel, the flow control means 11 c and 11 b are opened. The oil in circuit 6 a remains at a low temperature for a long time if the working hydraulics 6 a are not running, as is usual in the case of road travel. This is particularly the case if circuit 6 a is equipped with one or more variable pumps (not illustrated). Due to the low-loss standby operation of this type of pump the oil only warms up very slowly. The preferred embodiment solves this problem as follows: above a certain temperature difference betweentemperature sensors 12 b and 12 a, the flow control means 11 a is activated and closed, and the medium to be warmed up in circuit 6 a is directed to theheat exchanger 14. Thus the temperature in the circuit 6 a rises and the temperature in the circuit 6 b falls. This heat transfer has the consequence that the temperature in the circuit 6 b reduces and the oil in circuit 6 a warms up. The heating of the oil in circuit 6 a reduces the likelihood of cavities forming in the pumps in circuit 6 a. Furthermore as a result of the heating of the oil, the switching times of the solenoid valves in circuit 6 a are reduced, and their operational reliability improved. By this method of controlled heat transfer the circuit—not illustrated in detail—under certain circumstances may be simplified, while other means for heating the oil can be dispensed with. -
FIG. 7 shows a further preferred embodiment of the invention. The flow control means 11 c has been replaced by thecheck valve 16. Thecheck 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 11 b and 11 c fromFIG. 6 or 11 b and thecheck valve 16 fromFIG. 7 are replaced by a single control means 11 b, in order to reduce the component complexity and the costs. In the circuit according toFIG. 8 , heat energy can be transferred in a controlled way from circuit 6 a to 6 b and from circuit 6 b to circuit 6 a. The circuit according toFIG. 8 does not offer the possibility of separating the control for the performance of cooler 4 from the control for the performance ofheat exchanger 14.
Claims (8)
1-9. (canceled)
10. An oil cooling arrangement comprising:
a first transmission oil cooling circuit including a first oil pump, a first oil tank, a first oil temperature sensing means and an oil cooler;
a second separate oil cooling circuit for hydraulic consumers including a second oil pump, a second oil tank and a second oil temperature sensing means;
the two circuits being thermally interconnected by a heater exchanger through which both circuits flow separately;
by pass means in the first circuit for bypassing flow in the first circuit around the cooler and heat exchanger;
by pass means in the second circuit for bypassing flow in the second circuit around the heat exchanger, and
control means arranged to receive signals from the first and second temperature sensing means and for opening at least one of the bypass means in a predictable manner dependent on the temperature signals received by the control means.
11. An arrangement according to claim 10 in which the cooler and heat exchanger in the first circuit each have their own bypass means which is controlled by the control means and the heat exchanger has its own bypass means in the second circuit also controlled by the control means.
12. An arrangement according to claim 11 in which the bypass means each comprise solenoid operated fluid flow control valves connected in parallel to the cooler and heat exchanger in the first and second circuits.
13. An arrangement according to claim 10 in which the cooler and heat exchanger each have their own by-pass means in the first and second circuits, the bypass means for the heat exchanger in the first and second circuits comprising solenoid operated fluid flow control valves operated by the control means, and the by pass means for the cooler comprises a spring loaded check valve.
14. An arrangement according to claim 10 in which the cooler and heat exchanger have a single by pass means which by passes both the cooler and heat exchanger and which is operated by the control means.
15. An arrangement according to claim 10 in which the single by pass means comprises a single solenoid operated fluid flow control valve controlled by the control means.
16. An arrangement according to claim 14 in which the by pass means for the heat exchanger in the second circuit comprises a solenoid operated fluid flow control valve controlled by the control means.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102008030969.9 | 2008-06-30 | ||
DE102008030969A DE102008030969A1 (en) | 2008-06-30 | 2008-06-30 | Flow Control |
PCT/EP2009/058181 WO2010000737A1 (en) | 2008-06-30 | 2009-06-30 | Flow control |
Publications (1)
Publication Number | Publication Date |
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US20110132012A1 true US20110132012A1 (en) | 2011-06-09 |
Family
ID=41100737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/001,638 Abandoned US20110132012A1 (en) | 2008-06-30 | 2009-06-30 | Flow control |
Country Status (4)
Country | Link |
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US (1) | US20110132012A1 (en) |
EP (1) | EP2310692B1 (en) |
DE (1) | DE102008030969A1 (en) |
WO (1) | WO2010000737A1 (en) |
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US20160010392A1 (en) * | 2013-03-05 | 2016-01-14 | Bentec Gmbh Drilling & Oilfield Systems | Driving device for driving drill pipes and method for operating such a driving device |
US10260824B2 (en) | 2013-12-13 | 2019-04-16 | Cnh Industrial America Llc | Fluid cooler bypass system for an agricultural work vehicle |
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DE102017201225A1 (en) | 2017-01-26 | 2018-07-26 | Zf Friedrichshafen Ag | Method for operating a hydraulic system with a first switching valve, with a second switching valve and with a pressure filter |
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CN112268038B (en) * | 2020-10-19 | 2022-08-09 | 江苏徐工工程机械研究院有限公司 | Novel hydraulic oil cooling system |
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Cited By (6)
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US20160010392A1 (en) * | 2013-03-05 | 2016-01-14 | Bentec Gmbh Drilling & Oilfield Systems | Driving device for driving drill pipes and method for operating such a driving device |
US10260824B2 (en) | 2013-12-13 | 2019-04-16 | Cnh Industrial America Llc | Fluid cooler bypass system for an agricultural work vehicle |
CN103806497A (en) * | 2014-02-14 | 2014-05-21 | 上海三一重机有限公司 | Oil return system allowing oil temperature to be regulated automatically and excavator |
JP2015230094A (en) * | 2014-06-09 | 2015-12-21 | コベルコ建機株式会社 | Construction equipment |
US20230125940A1 (en) * | 2020-03-16 | 2023-04-27 | Volvo Truck Corporation | Control method, controller, and control program for controlling lubricating system, computer-readable medium carrying control program, lubricating system, and vehicle |
US11725550B2 (en) * | 2020-03-16 | 2023-08-15 | Volvo Truck Corporation | Control method, controller, and control program for controlling lubricating system, computer-readable medium carrying control program, lubricating system, and vehicle |
Also Published As
Publication number | Publication date |
---|---|
EP2310692B1 (en) | 2012-10-24 |
EP2310692A1 (en) | 2011-04-20 |
DE102008030969A1 (en) | 2009-12-31 |
WO2010000737A1 (en) | 2010-01-07 |
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