WO2011021405A1 - 油圧駆動装置の作動油温制御装置 - Google Patents
油圧駆動装置の作動油温制御装置 Download PDFInfo
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- WO2011021405A1 WO2011021405A1 PCT/JP2010/052897 JP2010052897W WO2011021405A1 WO 2011021405 A1 WO2011021405 A1 WO 2011021405A1 JP 2010052897 W JP2010052897 W JP 2010052897W WO 2011021405 A1 WO2011021405 A1 WO 2011021405A1
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- hydraulic
- oil
- flow rate
- 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
- 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
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- 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
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- 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
- E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
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- 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
-
- 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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- 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
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
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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
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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
- F15B2211/6306—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
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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
- F15B2211/632—Electronic controllers using input signals representing a flow rate
- F15B2211/6323—Electronic controllers using input signals representing a flow rate the flow rate being a pressure source flow rate
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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
- F15B2211/632—Electronic controllers using input signals representing a flow rate
- F15B2211/6326—Electronic controllers using input signals representing a flow rate the flow rate being an output member flow rate
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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
- F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
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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
- F15B2211/66—Temperature control methods
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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
- the present invention relates to a hydraulic fluid temperature control device for a hydraulic drive device provided in a construction machine such as a hydraulic excavator having a heavy load fluctuation.
- Patent Document 1 A conventional hydraulic oil temperature control device for a hydraulic drive device is disclosed in Patent Document 1.
- This prior art is provided in a hydraulic drive device of a construction machine having an engine, a hydraulic pump, a hydraulic actuator, a directional control valve, a return oil path to a hydraulic oil tank, and an oil cooler provided in the return oil path.
- a non-cooling oil passage that bypasses the oil cooler provided in the oil passage, a flow control valve that is provided in the non-cooling oil passage and controls the flow rate of the hydraulic oil flowing through the non-cooling oil passage, that is, an electromagnetic on-off valve, It consists of a controller that outputs a control signal that controls the electromagnetic on-off valve, and a temperature sensor that detects the operating oil temperature upstream of the oil cooler, and controls the electromagnetic on-off valve based on the oil temperature detected by the temperature sensor. is there.
- the amount of heat dissipated in the oil cooler is controlled by changing the shunt flow between the cooling oil passage and the non-cooling oil passage by opening and closing the electromagnetic on-off valve.
- the present invention has been made from the actual situation in the prior art as described above, and an object of the present invention is to provide a hydraulic oil temperature control device for a hydraulic drive device that can suppress fluctuations in hydraulic oil temperature to a small level.
- a hydraulic oil temperature control device for a hydraulic drive device includes an engine, a hydraulic pump driven by the engine, and a hydraulic actuator driven by pressure oil discharged from the hydraulic pump.
- a directional control valve that controls the flow of pressure oil supplied to the hydraulic actuator, and a return that connects the directional control valve and the hydraulic oil tank and guides return oil from the hydraulic actuator to the hydraulic oil tank.
- a hydraulic drive device having an oil passage and an oil cooler provided in the return oil passage; and a non-cooling oil passage that bypasses the oil cooler provided in the return oil passage; and the non-cooling oil passage.
- a hydraulic drive device provided with a flow rate control valve that controls the flow rate of hydraulic oil that is provided and that flows through the uncooled oil passage, and a control unit that outputs a control signal for controlling the flow rate control valve.
- the control unit includes a first calculation means for obtaining an energy element for raising the temperature of the hydraulic oil, a flow rate of the oil cooler known experimentally or empirically, and the oil cooler.
- the oil cooler passing flow rate and the operation which are set corresponding to the first relationship with the heat dissipation amount, and the heat dissipation amount of the oil cooler in the first relationship is replaced with an energy element that raises the temperature of the hydraulic oil.
- a first setting means for setting a second relationship with an energy element for raising the temperature of the oil; an energy element for raising the temperature of the hydraulic oil determined by the first computing means; and the setting for the first setting means.
- second calculation means for determining the passage flow rate of the oil cooler, and a second setting for setting a third relationship between the passage flow rate of the oil cooler and the passage flow rate of the flow control valve
- a third calculating means for determining a passing flow rate of the flow control valve based on the flow rate of the oil cooler determined by the second calculating means and the third relationship set by the second setting means.
- output means for outputting a control signal corresponding to the passage flow rate of the flow rate control valve obtained by the third calculation means to the flow rate control valve.
- the present invention configured as described above includes an energy element used for calculation in a control unit that controls a flow rate control valve provided in an uncooled oil passage that bypasses the oil cooler, and oil that is known experimentally or empirically. Therefore, the value of the control signal for controlling the flow rate control valve is a value that does not cause a time lag, and this makes it possible to suppress fluctuations in the hydraulic oil temperature.
- the hydraulic oil temperature control device for a hydraulic drive device is the hydraulic oil temperature control device according to the present invention, wherein the control unit includes fourth calculation means for determining the output of the engine, and fifth calculation means for determining the work of the hydraulic actuator.
- a third setting means for setting a fourth relationship between an output of the engine and work of the hydraulic actuator and an energy element for raising the temperature of the hydraulic oil, and the first calculation means of the control unit includes: The hydraulic oil is heated based on the engine output obtained by the fourth computing means, the work of the hydraulic actuator obtained by the fifth computing means, and the fourth relation set by the third setting means. It is characterized by seeking energy elements.
- the engine output is obtained from the fourth relation set by the third setting means by obtaining the engine output by the fourth calculating means and the work of the hydraulic actuator by the fifth calculating means. It is possible to obtain an energy element for raising the temperature of the hydraulic oil corresponding to the amount of heat released.
- the control unit includes fifth calculation means for obtaining work of the hydraulic actuator and sixth calculation means for obtaining input of the hydraulic pump. And fourth setting means for setting a fifth relationship between the work of the hydraulic actuator and the input of the hydraulic pump, and an energy element for raising the temperature of the hydraulic oil, and the first calculation means of the control unit includes: The hydraulic oil is calculated based on the work of the hydraulic actuator obtained by the fifth computing means, the input of the hydraulic pump obtained by the sixth computing means, and the fifth relationship set by the fourth setting means. It is characterized by obtaining an energy factor for raising the temperature.
- the fifth calculating means calculates the work of the hydraulic actuator and the sixth calculating means calculates the input of the hydraulic pump, respectively, thereby obtaining the fifth relation set by the fourth setting means.
- the control unit that controls the flow control valve provided in the non-cooling oil passage that bypasses the oil cooler is known experimentally or empirically from the first calculation means for obtaining the energy element for raising the temperature of the hydraulic oil.
- the oil cooler is set to correspond to a first relationship between the flow rate of the oil cooler and the amount of heat released from the oil cooler, and the amount of heat released from the oil cooler in the first relationship is increased.
- First setting means for setting a second relationship between the flow rate of the oil cooler replaced with an energy element and an energy element for raising the temperature of the hydraulic oil; and raising the temperature of the hydraulic oil obtained by the first arithmetic means.
- a second computing means for obtaining a flow rate of the oil cooler based on an energy element and the second relationship set by the first setting means; a flow rate of the oil cooler; A second setting means for setting a third relationship with the passage flow rate of the valve, a passage flow rate of the oil cooler obtained by the second calculation means, and the third relationship set by the second setting means. And a third computing means for obtaining a flow rate of the flow rate control valve and an output means for outputting a control signal corresponding to the flow rate of the flow rate control valve obtained by the third computation means to the flow rate control valve.
- the energy factor used for the calculation of this control unit is equivalent to the heat release amount of the oil cooler known experimentally or empirically, and therefore the value of the control signal for controlling the flow control valve is a time lag.
- fluctuations in the hydraulic oil temperature can be kept small. Therefore, the fluctuation of the viscosity of the hydraulic oil can be reduced as compared with the conventional case, and the operation of the hydraulic pump and the hydraulic actuator can be stabilized.
- FIG. 1 is a hydraulic circuit diagram showing a first embodiment of a hydraulic oil temperature control device of a hydraulic drive device according to the present invention. It is a figure which shows the relationship between the flow volume of the oil cooler known from experiment or experience, and the heat dissipation of an oil cooler. It is a figure which shows the relationship of the energy element which heats up the flow volume of the oil cooler set by the 1st setting means contained in the control part with which 1st Embodiment is provided, and hydraulic oil. It is a figure which shows the relationship between the passage flow volume of the oil cooler set by the 2nd setting means contained in the control part with which 1st Embodiment is equipped, and the passage flow volume of a flow control valve.
- FIG. 1 is a hydraulic circuit diagram showing a first embodiment of a hydraulic oil temperature control device for a hydraulic drive device according to the present invention
- FIG. 2 is an experimental or empirically known oil cooler passage flow rate and oil cooler discharge rate.
- FIG. 3 is a diagram illustrating a relationship between heat amounts
- FIG. 3 is a diagram illustrating a relationship between a flow rate of an oil cooler set by a first setting unit included in a control unit included in the first embodiment and an energy element that raises the temperature of hydraulic oil.
- FIG. 4 is a diagram showing the relationship between the passage flow rate of the oil cooler set by the second setting means included in the control unit provided in the first embodiment and the passage flow rate of the flow control valve
- FIG. 5 is provided in the first embodiment.
- FIG. 6 is a diagram showing the relationship between the engine output and the work of the hydraulic actuator set by the third setting means included in the control unit and the energy element for raising the temperature of the hydraulic oil
- FIG. 6 is a control unit provided in the first embodiment Processing in It is a flowchart illustrating a sequence.
- a hydraulic drive device for a construction machine provided with a hydraulic oil temperature control device is an engine 1 and a hydraulic pump driven by the engine 1. 2, a hydraulic actuator 3 driven by the pressure oil discharged from the hydraulic pump 2, a direction control valve 4 for controlling the flow of the pressure oil supplied to the hydraulic actuator 3, and the direction control valve 4 and the hydraulic oil
- An oil passage 6 that communicates with the tank 5 and guides return oil from the hydraulic actuator 3 to the hydraulic oil tank 5, a return oil passage 7, a cooling oil passage 8, and an oil cooler 9 provided in the cooling oil passage 8 have.
- the hydraulic oil temperature control device includes a non-cooling oil passage 10 that bypasses the oil cooler 9 and a hydraulic oil provided in the non-cooling oil passage 10.
- a flow rate control valve 11 for controlling the flow rate of the engine 1, a control unit 12 for outputting a control signal for controlling the flow rate control valve 11, a detection device 13 for detecting the torque and the rotational speed of the engine 1, and the pressure of the hydraulic actuator 3.
- a pressure detecting device 14 for detecting and a displacement detecting device 15 for detecting the displacement of the hydraulic actuator 3 are provided. These detection devices 13, 14, and 15 send detection values to the control unit 12.
- control unit 12 shows a first calculation means for obtaining an energy element for raising the temperature of the hydraulic oil, and a flow rate of the oil cooler 9 and a heat radiation amount of the oil cooler 9 known experimentally or empirically.
- the flow rate of the oil cooler 9 and the operating oil are increased in temperature by replacing the heat dissipation amount of the oil cooler 9 in the first relationship with the energy element that increases the temperature of the operating oil.
- the first setting means for setting the second relationship shown in FIG. 3 with the energy element, the energy element for raising the temperature of the hydraulic oil obtained by the first calculation means, and the second relationship set by the first setting means Based on the second calculation means for determining the passage flow rate of the oil cooler 9, second setting means for setting the third relationship shown in FIG.
- the first calculating means for example, the output of the engine 1 obtained by the fourth calculating means, the work of the hydraulic actuator obtained by the fifth calculating means, and the fourth set by the third setting means. Based on the relationship, an energy element for raising the temperature of the hydraulic oil is obtained.
- the output of the engine 1 based on the engine torque and the engine speed that are the detection values of the detection device 13.
- the work of the hydraulic actuator 3 is calculated based on the pressure and displacement of the hydraulic actuator 3 which are the detection values of the detection devices 14 and 15 (step 1).
- the output of the engine 1 calculated in step 1 and From the work of the hydraulic actuator 3, an energy element for raising the temperature of the hydraulic oil is calculated (step 2).
- an energy element for raising the temperature of the hydraulic oil is calculated (step 2).
- step 2 based on the relationship between the flow rate of the oil cooler 9 of FIG.
- the energy factor calculated in step 2 is used to determine the oil
- the passage flow rate of the cooler 9 is calculated (step 3).
- the flow rate control valve 11 is calculated from the passage rate of the oil cooler 9 calculated in step 3. Is calculated (step 4).
- a control signal corresponding to the passage flow rate of the flow rate control valve 11 calculated in step 4 is output to the flow rate control valve 11 (step 5).
- the opening area of the flow control valve 11 is appropriately controlled, and the return oil flowing from the hydraulic actuator 3 through the oil passage 6 and the return oil passage 7 flows to the oil cooler 9 through the cooling oil passage 8 and Part flows through the non-cooling oil passage 10 and passes through the flow control valve 11.
- the relationship between the passage flow rate of the oil cooler 9 and the heat radiation amount is as shown in FIG. 2 described above experimentally or empirically. That is, it is known that the heat radiation amount of the oil cooler 9 can be controlled by changing the flow rate of the oil cooler 9.
- the energy element for raising the temperature of the hydraulic oil used for the calculation of the control unit 12, that is, the energy element based on the output of the engine 1 and the work of the hydraulic actuator 3 is experimental or This is equivalent to the heat radiation amount of the oil cooler 9 known from experience. Therefore, the value of the control signal for controlling the flow control valve 11 is a value that does not cause a time lag. Thereby, the fluctuation
- FIG. 7 is a hydraulic circuit diagram showing a second embodiment of the present invention
- FIG. 8 is an input of a hydraulic pump and work of a hydraulic actuator set by a fourth setting means included in a control unit provided in the second embodiment, The figure which shows the relationship of the energy element which heats up hydraulic fluid
- FIG. 9 is a flowchart which shows the process sequence in the control part with which 2nd Embodiment is equipped.
- a flow rate detection device 16 that detects the hydraulic oil flow rate of the hydraulic actuator 3 is provided.
- a pressure detection device 17 for detecting the discharge pressure of the hydraulic pump 2 and a flow rate detection device 18 for detecting the discharge flow rate of the hydraulic pump 2 are provided. .
- These detection devices 16, 17, and 18 are connected to the control unit 12.
- the control unit 12 provided with this second embodiment is based on the fifth calculation means for obtaining the work of the hydraulic actuator 3 based on the detection devices 14 and 16 and the detection values of the pressure detection device 17 and the flow rate detection device 18.
- the sixth calculating means for obtaining the input of the hydraulic pump 2, the work of the hydraulic actuator 3 obtained by the fifth calculating means, the input of the hydraulic pump 2 obtained by the sixth calculating means, and the operating oil are heated.
- the first calculation means of the control unit 12 includes the work of the hydraulic actuator 3 obtained by the fifth calculation means, the input of the hydraulic pump 2 obtained by the sixth calculation means, and the fourth setting means. Based on the fifth relationship set in (5), the energy element for raising the temperature of the hydraulic oil is obtained.
- Other configurations are the same as those of the first embodiment.
- steps 1 and 2 are different from the flowchart of the first embodiment shown in FIG. That is, instead of calculating the output of the engine 1 and the work of the hydraulic actuator 3 in the first embodiment, in the second embodiment, the detection values of the pressure detection device 17 and the flow rate detection device 18 and the efficiency data of the hydraulic pump 2 are used. Based on the above, the input of the hydraulic pump 2 is calculated (step 1). Then, the work of the hydraulic actuator 3 calculated in step 1 is based on the relationship between the work of the hydraulic actuator 3 and the input of the hydraulic pump 2 shown in FIG. Then, an energy element for raising the temperature of the hydraulic oil is calculated from the input of the hydraulic pump 2 (step 2). Steps 3, 4 and 5 are the same as those in the first embodiment.
- the second embodiment configured in this way also has an energy element that raises the temperature of the hydraulic oil set to be equal to the amount of heat released from the oil cooler 9, that is, the input and hydraulic pressure of the hydraulic pump 2. Since the flow rate control valve 11 is controlled according to the energy factor based on the work of the actuator 3 and the second relationship of the first setting means shown in FIG. 3, the same effect as the first embodiment is obtained. Obtainable.
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Abstract
Description
2 油圧ポンプ
3 油圧アクチュエータ
4 方向制御弁
5 作動油タンク
6 油路
7 戻り油路
8 冷却油路
9 オイルクーラ
10 非冷却油路
11 流量制御弁
12 制御部(第1演算手段、第1設定手段、第2演算手段、第2設定手段、第3演算手段、出力手段、第4演算手段、第5演算手段、第3設定手段、第6演算手段、第4設定手段)
13 検出装置
14 圧力検出装置
15 変位検出装置
16 流量検出装置
17 圧力検出装置
18 流量検出装置
Claims (3)
- エンジンと、このエンジンによって駆動される油圧ポンプと、この油圧ポンプから吐出される圧油によって駆動する油圧アクチュエータと、この油圧アクチュエータに供給される圧油の流れを制御する方向制御弁と、この方向制御弁と作動油タンクとを連絡し、前記油圧アクチュエータからの戻り油を前記作動油タンクへと導く戻り油路と、この戻り油路に設けられたオイルクーラとを有する油圧駆動装置に備えられ、前記戻り油路に設けられた前記オイルクーラをバイパスする非冷却油路と、この非冷却油路に設けられ当該非冷却油路を流れる作動油の流量を制御する流量制御弁と、この流量制御弁を制御する制御信号を出力する制御部を設けた油圧駆動装置の作動油温制御装置において、
前記制御部は、
作動油を昇温させるエネルギー要素を求める第1演算手段と、
実験的あるいは経験的に知られている前記オイルクーラの通過流量と前記オイルクーラの放熱量との第1の関係に対応させて設定され、前記第1の関係の前記オイルクーラの放熱量を、前記作動油を昇温させるエネルギー要素に置き換えた前記オイルクーラの通過流量と前記作動油を昇温させるエネルギー要素との第2の関係を設定する第1設定手段と、
前記第1演算手段で求めた作動油を昇温させるエネルギー要素と、前記第1設定手段で設定された前記第2の関係に基づいて、前記オイルクーラの通過流量を求める第2演算手段と、
前記オイルクーラの通過流量と前記流量制御弁の通過流量との第3の関係を設定する第2設定手段と、
前記第2演算手段で求めた前記オイルクーラの通過流量と、前記第2設定手段で設定された前記第3の関係に基づいて、前記流量制御弁の通過流量を求める第3演算手段と、
前記第3演算手段で求めた前記流量制御弁の通過流量に相応する制御信号を前記流量制御弁に出力する出力手段とを含むことを特徴とする油圧駆動装置の作動油温制御装置。 - 請求項1に記載の油圧駆動装置の作動油温制御装置において、
前記制御部は、
前記エンジンの出力を求める第4演算手段と、
前記油圧アクチュエータの仕事を求める第5演算手段と、
前記エンジンの出力及び前記油圧アクチュエータの仕事と、前記作動油を昇温させるエネルギー要素との第4の関係を設定する第3設定手段とを含み、
前記制御部の前記第1演算手段は、前記第4演算手段で求めたエンジンの出力及び前記第5演算手段で求めた油圧アクチュエータの仕事と、前記第3設定手段で設定された第4の関係に基づいて、前記作動油を昇温させるエネルギー要素を求めることを特徴とする油圧駆動装置の作動油温制御装置。 - 請求項1に記載の油圧駆動装置の作動油温制御装置において、
前記制御部は、
前記油圧アクチュエータの仕事を求める第5演算手段と、
前記油圧ポンプの入力を求める第6演算手段と、
前記油圧アクチュエータの仕事及び前記油圧ポンプの入力と、前記作動油を昇温させるエネルギー要素との第5の関係を設定する第4設定手段とを含み、
前記制御部の前記第1演算手段は、前記第5演算手段で求めた油圧アクチュエータの仕事及び前記第6演算手段で求めた前記油圧ポンプの入力と、前記第4設定手段で設定された第5の関係に基づいて、前記作動油を昇温させるエネルギー要素を求めることを特徴とする油圧駆動装置の作動油温制御装置。
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US13/390,652 US9103096B2 (en) | 2009-08-17 | 2010-02-24 | Operating oil temperature controller for hydraulic drive device |
CN201080036223.3A CN102472303B (zh) | 2009-08-17 | 2010-02-24 | 液压驱动装置的工作油温控制装置 |
DE112010003299T DE112010003299T5 (de) | 2009-08-17 | 2010-02-24 | Steuerung für die Ölbetriebstemperatur einer hydraulischen Antriebseinrichtung |
JP2011527595A JP5380538B2 (ja) | 2009-08-17 | 2010-02-24 | 油圧駆動装置の作動油温制御装置 |
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