JP5245163B2 - Hydraulic oil component replenishment apparatus and method in hydraulic system - Google Patents

Description

The present invention relates to an apparatus and method for replenishing components of hydraulic fluid in a hydraulic system operated by hydraulic fluid.

  Work vehicles such as construction machines are equipped with a hydraulic system.

  The hydraulic system is operated by hydraulic fluid. The component of hydraulic oil consists of a base oil and an additive.

In recent years, hydraulic oils used in hydraulic systems have been used in which base oil is added with a viscosity modifier as an additive for the purpose of preventing oil leakage and improving mechanical efficiency.

However, as the hydraulic oil is used, the viscosity of the hydraulic oil deteriorates (changes), and the initial performance cannot be maintained. Accordingly, when the viscosity of the hydraulic oil deteriorates, it is necessary to replenish the hydraulic oil with an optimal amount of base oil or viscosity modifier at an optimal time. If the supply of base oil or viscosity modifier is delayed or the supply amount is insufficient, the deterioration of the hydraulic oil cannot be suppressed, and if the base oil or viscosity modifier is supplied quickly or the supply amount is excessive, This is because, for example, the work machine becomes hard and the working machine becomes sluggish.

Patent Document 1 below describes an invention in which the degree of deterioration of engine oil is determined by measuring the total engine speed, and engine oil is replenished when the measured total engine speed exceeds a reference value. Yes.

Patent Document 2 below describes an invention in which the viscosity of an engine oil is measured, and when the viscosity is lower than a reference value, it is determined that the engine oil has deteriorated and the engine oil is replenished.

JP-A-8-326519 JP 2000-220429 A

As with the engine oil described in Patent Document 1, it is impossible to determine the degree of deterioration of the hydraulic oil used for the operation of a construction machine working machine or the like based on the engine speed. That is, for example, in construction machinery, depending on the vehicle type, the engine power is transmitted not only to the hydraulic system but also to the drive wheels via the travel drive force transmission path. Also, just because the engine is operating does not mean that the work machine is always operating. Therefore, the engine rotation speed and engine operating time cannot be used as a guideline for the degree of deterioration of hydraulic oil.
The invention described in Patent Document 1 cannot be used as it is to determine the degree of deterioration of hydraulic oil used in a hydraulic system such as a construction machine.

As described in Patent Document 2, when the standard of the degree of deterioration of the hydraulic fluid is simply a viscosity, the viscosity varies greatly depending on the temperature, so that there is a problem that accurate determination is lacking. When the temperature of the hydraulic oil is unknown and only the viscosity measurement result is used to determine and replenish the degree of deterioration, there is a problem that the accuracy of judgment and the amount of replenishment are not accurate. For example, the temperature of the hydraulic oil immediately after starting the engine is generally low and the viscosity is high. When the degree of deterioration is judged from the measurement result of the viscosity at this time, the temperature of the hydraulic oil is not good even though the hydraulic oil has deteriorated (viscosity decreases). Since the hydraulic oil is harder than the actual time, it is erroneously determined that the hydraulic oil is not deteriorated.

The present invention has been made in view of such circumstances, and accurately determines the degree of deterioration of the components of the hydraulic oil used in the hydraulic system so that the hydraulic oil component can be replenished in an optimal amount,
The problem to be solved is to suppress the deterioration of the hydraulic oil and to maintain the performance of the hydraulic oil.

The first invention is
A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring means for measuring the viscosity of the hydraulic oil or the temperature and viscosity of the hydraulic oil at a constant temperature;
Compare the viscosity measurement value at a certain temperature or the viscosity measurement value at the measurement temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, and determine that the measured viscosity value is below the viscosity reference value for the viscosity modifier. Judgment means,
Storage means in which the viscosity modifier is stored;
A supply path for supplying the viscosity adjusting agent in the storage means to the hydraulic oil;
Opening and closing means for adjusting opening and closing of the supply path;
When it is determined by the determination means that the measured viscosity value is lower than the viscosity reference value for the viscosity modifier, the viscosity modifier is replenished to the hydraulic oil until the measured viscosity value reaches the viscosity reference value for the viscosity modifier. And a control means for controlling the opening / closing means.

The second invention is the first invention,
Temperature control means for adjusting the temperature of the hydraulic oil to a constant temperature is provided,
The measuring means measures the viscosity of the hydraulic oil temperature-controlled by the temperature adjusting means.

The third invention is
A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid,
Measuring means for measuring the viscosity of the hydraulic oil or the temperature and viscosity of the hydraulic oil at a constant temperature;
Judgment means that compares the viscosity measurement value at a constant temperature or the viscosity measurement value at the measurement temperature with the base oil viscosity reference value at the corresponding temperature and determines that the viscosity measurement value exceeds the base oil viscosity reference value When,
Storage means in which hydraulic oil base oil is stored;
A supply path for supplying the base oil in the storage means to the hydraulic oil;
Opening and closing means for adjusting opening and closing of the supply path;
When the determination means determines that the measured viscosity value exceeds the base oil viscosity reference value, the base oil is replenished to the hydraulic oil until the measured viscosity value drops to the base oil viscosity reference value. And a control means for controlling the opening and closing means.

The fourth invention is the third invention,
Temperature control means for adjusting the temperature of the hydraulic oil to a constant temperature is provided,
The measuring means measures the viscosity of the hydraulic oil temperature-controlled by the temperature adjusting means.

The fifth invention
A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring means for measuring the viscosity of the hydraulic oil at a constant temperature of high temperature and the temperature of the hydraulic oil at a constant temperature of low temperature;
A first high-temperature viscosity measurement value at a constant high temperature is compared with a viscosity reference value for a viscosity modifier at a corresponding temperature to determine that the high-temperature viscosity measurement value is lower than the viscosity reference value for a viscosity modifier. Judgment means,
A second determination means for comparing the measured viscosity value at a constant low temperature with the base oil viscosity reference value at the corresponding temperature and determining that the low temperature viscosity measured value exceeds the base oil viscosity reference value; ,
First storage means in which a viscosity modifier is stored;
A second storage means in which the base oil of the hydraulic oil is stored; a first supply path that supplies the viscosity adjusting agent in the first storage means to the hydraulic oil;
A second supply path for supplying the base oil in the second storage means to the hydraulic oil;
First opening / closing means for adjusting opening / closing of the first supply path;
Second opening / closing means for adjusting opening / closing of the second supply path;
When it is determined by the first determination means that the high-temperature viscosity measurement value is lower than the viscosity reference value for viscosity modifier, the viscosity modifier until the high-temperature viscosity measurement value reaches the viscosity reference value for viscosity modifier Controlling the first opening and closing means so that the hydraulic oil is replenished with hydraulic oil,
When the second determination means determines that the low temperature viscosity measurement value exceeds the base oil viscosity reference value, the base oil operates until the low temperature viscosity measurement value falls to the base oil viscosity reference value. And control means for controlling the second opening / closing means so as to be replenished with oil.

A sixth invention is the first invention,
A flow rate measuring means for measuring the flow rate of the viscosity modifier passing through the supply path is provided,
The control means controls the opening / closing means until the cumulative value of the measured flow rate reaches the cumulative flow rate reference value corresponding to the viscosity measurement value.

A seventh invention is the third invention,
A flow rate measuring means for measuring the flow rate of the base oil passing through the supply path is provided,
The control means controls the opening / closing means until the cumulative value of the measured flow rate reaches the cumulative flow rate reference value corresponding to the viscosity measurement value.

In an eighth aspect based on the fifth aspect,
A first flow rate measuring means for measuring the flow rate of the viscosity adjusting agent passing through the first supply path and a second flow rate measuring means for measuring the flow rate of the base oil passing through the second supply path are provided;
The control means controls the first opening / closing means until the cumulative value of the flow rate measured by the first flow rate measurement means reaches the cumulative flow rate reference value corresponding to the high temperature viscosity measurement value,
The second opening / closing means is controlled until the cumulative value of the flow rate measured by the second flow rate measuring means reaches the cumulative flow rate reference value corresponding to the low-temperature viscosity measurement value.

The ninth invention
A hydraulic fluid component replenishment method in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring the viscosity of the hydraulic oil at a constant temperature or the temperature and viscosity of the hydraulic oil;
Compare the viscosity measurement value at a certain temperature or the viscosity measurement value at the measurement temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, and determine that the measured viscosity value is below the viscosity reference value for the viscosity modifier. Steps,
Replenishing the hydraulic fluid with the viscosity modifier until the viscosity measurement value reaches the viscosity reference value for the viscosity modifier when it is determined that the measured viscosity value is lower than the viscosity reference value for the viscosity modifier. It is a hydraulic oil component replenishment method in a hydraulic system.

The tenth invention is
A hydraulic oil component replenishment method in a hydraulic system operated by hydraulic oil,
Measuring the viscosity of the hydraulic oil at a constant temperature or the temperature and viscosity of the hydraulic oil;
Comparing the viscosity measurement value at a constant temperature or the viscosity measurement value at the measurement temperature with the base oil viscosity reference value at the corresponding temperature, and determining that the viscosity measurement value exceeds the base oil viscosity reference value; ,
And a step of replenishing the base oil with the base oil until the viscosity measurement value falls to the base oil viscosity reference value when it is determined that the viscosity measurement value exceeds the base oil viscosity reference value. This is a hydraulic oil component replenishment method in.

The eleventh invention is
A hydraulic fluid component replenishment method in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring the viscosity of the hydraulic oil at a constant temperature of high temperature and the temperature of the hydraulic oil at a constant temperature of low temperature;
Comparing the measured viscosity value at a constant temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, judging that the measured high temperature viscosity value is lower than the viscosity reference value for the viscosity modifier,
Comparing the viscosity measurement value at a low constant temperature with the base oil viscosity reference value at the corresponding temperature, and determining that the low temperature viscosity measurement value exceeds the base oil viscosity reference value;
When it is determined that the high temperature viscosity measurement value is lower than the viscosity standard value for the viscosity modifier, the viscosity oil is replenished to the hydraulic oil until the high temperature viscosity measurement value reaches the viscosity standard value for the viscosity modifier,
Including a step of supplying the base oil to the hydraulic oil until the measured viscosity value is reduced to the base oil viscosity reference value when it is determined that the low temperature viscosity measurement value exceeds the base oil viscosity reference value. It is a hydraulic oil component replenishment method in the system.

According to the first invention, the viscosity measurement value at a constant temperature or the viscosity measurement value at a measurement temperature;
When the viscosity measurement value is determined to be lower than the viscosity reference value for the viscosity modifier by comparing with the viscosity reference value for the viscosity modifier at the corresponding temperature, the viscosity reference value for the viscosity modifier is determined. Since the viscosity modifier is replenished to the hydraulic oil until the pressure reaches the value, the degree of deterioration of the viscosity modifier contained in the hydraulic fluid used in the hydraulic system is the viscosity measured value and the reference value with the same temperature. Therefore, it is possible to replenish a new viscosity modifier in an optimal amount. As a result, the deterioration of the hydraulic oil is suppressed, and the performance of the hydraulic oil can be maintained.

In the second invention, in the first invention, the viscosity of the hydraulic oil at a constant temperature is measured after adjusting the temperature of the hydraulic oil to a constant temperature.

According to the third invention, the viscosity measurement value at a constant temperature or the viscosity measurement value at a measurement temperature;
Compared to the base oil viscosity reference value at the corresponding temperature, and if it is determined that the measured viscosity value exceeds the base oil viscosity reference value, the measured viscosity value drops to the base oil viscosity reference value. Since the base oil is replenished to the hydraulic oil, the degree of deterioration of the base oil contained in the hydraulic oil used in the hydraulic system is compared with the measured viscosity value and the reference value under the same temperature conditions. The new base oil can be replenished in an optimum amount. As a result, the deterioration of the hydraulic oil is suppressed, and the performance of the hydraulic oil can be maintained.

In the fourth invention, in the third invention, the temperature of the hydraulic oil is adjusted to a constant temperature, and then the viscosity of the hydraulic oil at the constant temperature is measured.

According to the fifth invention, the high temperature viscosity measurement value at a constant high temperature is compared with the viscosity reference value for viscosity modifier at the corresponding temperature, and the high temperature viscosity measurement value is below the viscosity reference value for viscosity modifier. Compare the measured viscosity value at a constant low temperature with the viscosity reference value for base oil at the corresponding temperature, and determine that the measured low temperature viscosity value exceeds the viscosity reference value for base oil. When it is determined that the high temperature viscosity measurement value is lower than the viscosity standard value for the viscosity modifier, the viscosity modifier is replenished to the hydraulic oil until the high temperature viscosity measurement value reaches the viscosity standard value for the viscosity modifier. In addition, if it is determined that the low-temperature viscosity measurement value exceeds the base oil viscosity reference value, the base oil is replenished to the hydraulic oil until the low-temperature viscosity measurement value falls to the base oil viscosity reference value. So that the oil The degree of deterioration of the viscosity modifier contained in the hydraulic fluid used in the system is accurately judged by comparing the measured viscosity value with the reference value at the same temperature at the same temperature, and used in the hydraulic system. The degree of deterioration of the base oil contained in the hydraulic oil is accurately judged by comparing the measured viscosity value with the reference value at the same temperature at the same temperature, and the new base oil and the new base oil are optimal. It will be possible to replenish only the amount. As a result, the deterioration of the hydraulic oil is suppressed, and the performance of the hydraulic oil can be maintained.

In a sixth invention, in the first invention, when the viscosity modifier is replenished, the flow rate of the supplied viscosity modifier is measured, and the measured flow rate is supplied until it reaches a reference value corresponding to the viscosity measurement value. Therefore, an appropriate amount of viscosity modifier can be replenished.

In the seventh invention, in the third invention, when replenishing the base oil, the flow rate of the supplied base oil is measured,
Since the measured flow rate is supplied until it reaches the reference value corresponding to the viscosity measurement value, an appropriate amount of base oil can be replenished.

In the eighth invention, in the fifth invention, when the viscosity modifier is replenished, the flow rate of the supplied viscosity modifier is measured and supplied until the measured flow rate reaches a reference value corresponding to the high temperature viscosity measurement value. In addition, when replenishing the base oil, the flow rate of the supplied base oil is measured, and the measured flow rate is supplied until it reaches the reference value corresponding to the low-temperature viscosity measurement value. Regulator,
Appropriate amount of base oil can be replenished respectively.

The ninth invention is a method invention corresponding to the invention of the apparatus of the first invention, and the same effect as the first invention can be obtained.

The tenth invention is a method invention corresponding to the device invention of the third invention, and the same effect as the third invention can be obtained.

The eleventh invention is a method invention corresponding to the invention of the apparatus of the fifth invention, and the same effect as the fifth invention is obtained.

FIG. 1 is a block diagram of the first embodiment. FIG. 2 is a control block diagram of the controller in the first embodiment. FIG. 3 is a configuration diagram of the sensor and the heater in the first embodiment. FIG. 4 is a flowchart showing a processing procedure in the first embodiment. FIG. 5 is a block diagram of the second embodiment. FIG. 6 is a control block diagram of the controller in the second embodiment. FIG. 7 is a flowchart showing a processing procedure in the second embodiment. FIG. 8 is a block diagram of the third embodiment. FIG. 9 is a block diagram of the fourth embodiment. FIG. 10 is a block diagram of the fifth embodiment. FIG. 11 is a flowchart showing a processing procedure in the sixth embodiment. FIG. 12 is a block diagram of the seventh embodiment. FIGS. 13A, 13B, 13C, and 13D are graphs showing the relationship between the temperature and the viscosity of the hydraulic oil, respectively. FIG. 14 is a flowchart showing a processing procedure in the seventh embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a hydraulic oil component replenishing device and method in a hydraulic system according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a hydraulic oil component replenishing device in a hydraulic system according to an embodiment.

A hydraulic system 1 shown in FIG. 1 is mounted on, for example, a construction machine and operates a work machine, a traveling device, and the like. As an example, the hydraulic actuator is a hydraulic motor. It can also be used.

The hydraulic pump 2 is a variable capacity type, and its discharge port 2 a communicates with the pump discharge oil passage 3. The hydraulic pump 2 is driven by an engine (not shown) and sucks hydraulic oil from the oil tank 4 and discharges the pressure oil to the pump discharge oil passage 3. The swash plate 2b of the hydraulic pump 2 is driven and controlled by a control device (not shown).

FIG. 2 is a block diagram illustrating control functions of the controller 10. FIG. 2 shows only the control function according to the present invention. The controller 10 includes a viscosity measuring unit 11, a control start determining unit 12, and an on / off valve opening / closing control unit 13.

  A flow direction control valve 5 is provided in the pump discharge oil passage 3.

The flow direction control valve 5 controls the direction and flow rate of the pressure oil supplied to the hydraulic motor 6. The valve position of the flow direction control valve 5 is driven and controlled by a control device (not shown).

When the valve position of the flow direction control valve 5 is switched to the A position 5A, the pressure oil discharged from the hydraulic pump 2 passes through the opening of the opening area corresponding to the valve position, and the flow rate corresponding to the opening area is changed. Pressure oil is supplied to one inlet / outlet 6A of the hydraulic motor 6 through the oil passage 7A, and pressure oil is discharged from the other inlet / outlet 6B to the oil tank 4 through the oil passage 7B and the flow direction control valve 5. Is done.

As a result, the hydraulic motor 6 is rotated in one direction A. Further, when the valve position of the flow direction control valve 5 is switched to the B position 5B, the pressure oil discharged from the hydraulic pump 2 passes through the opening of the opening area corresponding to the valve position, and the opening area corresponds to the opening area. A flow rate of pressure oil is supplied to the other inlet / outlet 6B of the hydraulic motor 6 via the oil passage 7B, and pressure oil is supplied from the other outlet 6A to the oil passage 7A,
It is discharged to the oil tank 4 through the flow direction control valve 5. As a result, the hydraulic motor 6 is rotated in the other direction B.

The apparatus according to the present invention can be configured by adding a branch oil passage 9, a viscosity sensor 20, a temperature adjusting means 30, a replenishing tank 40, a supply passage 50, and an on-off valve 60 to an existing hydraulic system 1.

That is, the branch oil passage 9 communicates with the pump discharge oil passage 3. The branch oil passage 9 is provided with a viscosity sensor 20. The branch oil passage 9 communicates with the oil tank 4. The pressure oil discharged from the hydraulic pump 2 passes through the branch oil passage 9 and is discharged to the oil tank 4.

The viscosity sensor 20 detects the viscosity of the hydraulic oil. The viscosity sensor 20 is provided with temperature adjusting means 30 for adjusting the temperature of the hydraulic oil to a constant temperature.

  FIG. 3 is a diagram showing the configuration of the viscosity sensor 20 and the temperature adjusting means 30.

The viscosity sensor 20 includes a throttle 21 formed in the branch oil passage 9 and pressures P1, P before and after the throttle 21.
Pressure gauges 22 and 23 for detecting 2 respectively, and a flow meter 24 for detecting a flow rate q of hydraulic oil passing through the throttle 21. The temperature adjustment means 30 includes a heater 31 disposed around the throttle 21 of the branch oil passage 9, a thermometer 32 that detects the temperature of the hydraulic oil that passes through the throttle 21, and a detection signal of the thermometer 32 as a feedback signal. Adjusting the power supplied to the heater 31;
It is comprised from the temperature regulator 33 which controls the temperature of the hydraulic oil which passes the aperture_diaphragm | restriction 21 to fixed temperature.

Here, the constant temperature is 110 ° C., for example. Note that the function of the temperature controller 33 may be incorporated in the controller 10.

Detection signals from the viscosity sensor 20 and the thermometer 32 are input to the controller 10.

In the viscosity measuring unit 11 of the controller 10, the differential pressure P 1 -P 2 between the pressures P 1 and P 2 before and after the throttle 21 detected by the pressure gauges 22 and 23, and the hydraulic oil passing through the throttle 21 detected by the flow meter 24. The viscosity of the hydraulic oil is measured based on the flow rate q. The temperature of the hydraulic oil is controlled to a constant temperature by the temperature adjusting means 30. For this reason, the viscosity of the hydraulic fluid at a constant temperature is measured.

The replenishing tank 40 as a storage means stores a viscosity adjusting agent that constitutes an additive for the hydraulic oil and adjusts the viscosity of the hydraulic oil.

A supply path 50 communicates with the supply tank 40. The supply path 50 is provided with an opening / closing valve 60 as an opening / closing means for adjusting the opening / closing of the supply path 50. The on-off valve 60 is controlled by the on-off valve opening / closing control unit 13 of the controller 10. The on / off valve 60 is opened / closed by an open / close signal output from the controller 10. The supply path 50 communicates with the oil tank 4.

Based on the detection signal from the thermometer 32, the control start determination unit 12 of the controller 10
It is determined when to start the zero control.

When the control start determination unit 12 determines that it is time to start the control of the on / off valve 60, the on-off valve opening / closing control unit 13 of the controller 10 and the viscosity measurement value at a constant temperature measured by the viscosity measurement unit 11 When the viscosity measurement value is determined to be lower than the viscosity reference value for the viscosity modifier, the viscosity reference value for the viscosity modifier is determined to be lower than the viscosity reference value for the viscosity modifier. The on-off valve 60 is controlled so that the viscosity modifier is replenished to the hydraulic oil in the oil tank 4 until the value is reached.

Hereinafter, the procedure of the control process performed by the controller 10 will be described with reference to the flowchart shown in FIG.

First, it is determined whether or not the temperature of the hydraulic oil detected by the thermometer 32 is within an allowable temperature range of a constant temperature ± α. Here, the allowable temperature range is that the temperature of the hydraulic oil is constant (11
0 ° C.) is set to a temperature range (for example, 110 ° C. ± 5 ° C.) that can be allowed to reach (step 101).

If the detected temperature is out of the allowable temperature range (determination NO in step 101), the on-off valve 60 is kept closed (step 102), but if the detected temperature falls within the allowable temperature range (step 101). YES in step 103) to start the opening / closing control of the opening / closing valve 60.
Migrate to

In step 103, the measured viscosity value at the constant temperature (110 ° C.) measured by the viscosity measuring unit 11 is compared with the viscosity reference value for the viscosity adjusting agent at the corresponding temperature (110 ° C.), and the measured viscosity value is used to adjust the viscosity. It is determined whether the viscosity reference value for the agent is below (step 103).

As a result, when it is determined that the measured viscosity value is lower than the viscosity reference value for the viscosity modifier (YES in Step 103), an open signal is output to the on-off valve 60, and the supply path 50 is opened. The viscosity adjusting agent is supplied from the supply tank 40 to the hydraulic oil in the oil tank 4 via the supply path 50 (step 104).

The procedure returns to step 101, the same processing is performed, and the temperature of the hydraulic oil is constant (11
As long as the temperature is within a temperature range (for example, 110 ° C. ± 5 ° C.) that can be allowed to reach 0 ° C. (YES in Step 101) and the viscosity measurement value does not reach the viscosity reference value for the viscosity modifier (Step (Yes in 103), the on-off valve 60 remains open, and the viscosity adjusting agent is continuously supplied from the supply tank 40 to the hydraulic oil in the tank 4 through the supply path 50 (step 104).

Eventually, when it is determined that the measured viscosity value has reached the viscosity reference value for the viscosity modifier (step 10).
3), a close signal is output to the on-off valve 60, the supply path 50 is closed, and the replenishment tank 40
The supply of the viscosity adjusting agent to the hydraulic oil in the oil tank 4 is stopped (step 105).

As described above, according to this example, the measured viscosity value at a constant temperature is compared with the viscosity reference value for the viscosity modifier at the corresponding temperature, and the measured viscosity value is lower than the viscosity reference value for the viscosity modifier. If it is determined that the viscosity adjusting agent is supplied to the hydraulic oil until the measured viscosity value reaches the viscosity reference value for the viscosity adjusting agent, the viscosity contained in the hydraulic oil used in the hydraulic system 1 The degree of deterioration of the adjusting agent is accurately determined based on a comparison between the measured viscosity value and the reference value under the same temperature condition, and a new viscosity adjusting agent can be replenished in an optimum amount. As a result, the deterioration of the hydraulic oil is suppressed, and the performance of the hydraulic oil can be maintained.

Various modifications can be made to the first embodiment described above.

(Second embodiment)
FIG. 5 shows an apparatus configuration corresponding to FIG. In the following, repeated description of the same parts as those in the first embodiment will be omitted, and the added or changed parts will be described.

As shown in FIG. 5, in the apparatus configuration of the second embodiment, the supply path 50 is provided with a flow meter 70 as flow rate measuring means for measuring the flow rate Q of the viscosity modifier passing through the supply path 50. Flow meter 70
A signal indicating the flow rate measured at is input to the controller 10.

FIG. 6 is a block diagram of the controller 10 corresponding to FIG. In contrast to the configuration shown in FIG. 2, a cumulative flow reference value memory 14, a timer 15, and a cumulative flow calculation unit 16 are added to the controller 10.

When the timer 15 is turned on, the timer 15 measures the time t during which the on-off valve 60 is open.

The accumulated flow rate reference value memory 14 stores the accumulated flow rate reference values Q0 and T0 of the viscosity adjusting agent necessary according to the measured viscosity value.

The cumulative flow rate calculation unit 16 is configured to measure the flow rate Q measured by the flow meter 70 and the time t measured by the timer 15.
And the cumulative flow rate Q · t is calculated.

The on-off valve opening / closing control unit 13 reads the cumulative flow rate reference value Q0 · t0 corresponding to the viscosity measurement value from the cumulative flow rate reference value memory 14, and the cumulative flow rate Q · t calculated by the cumulative flow rate calculation unit 16 is
The opening / closing of the on-off valve 60 is controlled until the read cumulative flow reference value Q0 · t0 is reached.

Hereinafter, the procedure of the control process performed by the controller 10 will be described with reference to the flowchart shown in FIG.

First, it is determined whether or not the temperature of the hydraulic oil detected by the thermometer 32 is within an allowable temperature range (for example, 110 ° C. ± 5 ° C.) of a constant temperature ± α (step 201).

If the detected temperature is outside the allowable temperature range (NO at step 201), the on-off valve 60 is kept closed (step 202), but if the detected temperature is within the allowable temperature range (step 201). YES in step 203) to start the opening / closing control of the opening / closing valve 60.
Migrate to

In step 203, the viscosity measurement value at the constant temperature (110 ° C.) measured by the viscosity measurement unit 11 is compared with the viscosity reference value for the viscosity adjusting agent at the corresponding temperature (110 ° C.), and the viscosity measurement value is the viscosity adjustment. It is determined whether or not the viscosity reference value for the agent is below (step 203).

As a result, when it is determined that the measured viscosity value is below the viscosity reference value for the viscosity modifier (YES at Step 203), an open signal is output to the on-off valve 60 and the supply path 50 is opened. The viscosity adjusting agent is supplied from the supply tank 40 to the hydraulic oil in the oil tank 4 through the supply path 50 (step 204).

Next, the timer 15 is turned on and the time t during which the on-off valve 60 is open is counted (step 2).
05).

Next, the flow rate Q measured by the flow meter 70 is multiplied by the time t measured by the timer 15,
The accumulated flow rate Q · t is calculated. Then, the cumulative flow rate reference value Q0 · t0 corresponding to the viscosity measurement value is read from the cumulative flow rate reference value memory 14, and the calculated cumulative flow rate Q · t is equal to or greater than the read cumulative flow rate reference value Q0 · t0. It is determined whether or not (step 206). As long as the cumulative flow rate Q · t is less than the cumulative flow rate reference value Q0 · T0 (determination NO in step 206), the open / close valve 60 is maintained open, but eventually the cumulative flow rate Q · t becomes the cumulative flow rate reference. When the value Q0 · t0 is reached (YES in step 206), a close signal is output to the on-off valve 60, the supply path 50 is closed, and the viscosity regulator is supplied from the supply tank 40 to the hydraulic oil in the oil tank 4. Stops (step 207). Thereafter, the procedure returns to step 201 and the same processing is performed, but when it is determined in step 203 that the viscosity measurement value has reached the viscosity reference value for the viscosity modifier (step 20).
3), the on-off valve 60 is kept closed (step 208).

(Third embodiment)
In the embodiment described above, by providing the temperature control means 30 in addition to the viscosity sensor 20, the viscosity measurement value at a constant temperature is measured, and the viscosity measurement value at a constant temperature (eg, 110 ° C.) and the corresponding constant temperature (110 The viscosity reference value for the viscosity modifier at (° C.) is compared.

However, as shown in FIG. 8, in addition to the viscosity sensor 20, only the thermometer 32 is provided, and the measured viscosity value at the measurement temperature T (the present arbitrary temperature measured by the thermometer 32, for example, 90 ° C.). And a viscosity reference value for a viscosity modifier at a corresponding temperature T (90 ° C.) can be compared. In this case, it is necessary to store in advance viscosity reference values for viscosity modifiers corresponding to each arbitrary temperature T.

(Fourth embodiment)
Further, as shown in FIG. 9, in order to efficiently replenish the viscosity modifier,
It is also possible to provide a temperature adjusting means 30 ′ similar to the temperature adjusting means 30 and adjust the temperature of the viscosity adjusting agent stored in the replenishing tank 40 to a constant temperature. Furthermore, the viscosity of the hydraulic oil in the oil tank 4 and
It is also possible to adjust the temperature of the viscosity adjusting agent stored in the replenishing tank 40 so that the viscosity of the viscosity adjusting agent in the replenishing tank 40 becomes the same. As a result, the viscosity regulator is
Is supplied to the hydraulic oil in the oil tank 40, the viscosity adjusting agent is easily mixed.

(5th Example)
Further, as shown in FIG. 10, the oil tank 4 is provided with a stirrer 80 for stirring the hydraulic oil in the oil tank 4, and the hydraulic oil in the oil tank 4 and the viscosity adjusting agent supplied from the supply tank 40 are supplied. You may comprise so that it may mix uniformly.

(Sixth embodiment)
In each of the above-described embodiments, a viscosity modifier is assumed as the deterioration component of the hydraulic oil, and the viscosity modifier is replenished when the viscosity modifier is deteriorated. However, it is also possible to assume that the base oil is assumed as the deterioration component of the hydraulic oil and to replenish the base oil when the base oil deteriorates.

When the base oil is deteriorated, the viscosity is increased contrary to the case where the viscosity modifier is deteriorated. Therefore, the “viscosity modifier” in the above-mentioned first to fifth embodiments is replaced with “base oil”, “viscosity modifier viscosity reference value” is replaced with “base oil viscosity reference value”, and “ Similarly, by substituting “being lower” to “being higher”, the control when the base oil is deteriorated can be similarly performed.

As an example, a flowchart corresponding to the flowchart of FIG. 4 of the first embodiment is shown in FIG. 11 and described. Hereinafter, the procedure of the control process performed by the controller 10 will be described with reference to the flowchart shown in FIG.

First, it is determined whether or not the temperature of the hydraulic oil detected by the thermometer 32 is within an allowable temperature range of a constant temperature ± α (step 301).

If the detected temperature is outside the allowable temperature range (NO at step 301), the on-off valve 60 is kept closed (step 302), but if the detected temperature falls within the allowable temperature range (step 301). YES in step 303) to start the opening / closing control of the opening / closing valve 60.
Migrate to

In step 303, the viscosity measurement value at a constant temperature (for example, 40 ° C.) measured by the viscosity measurement unit 11 is compared with the base oil viscosity reference value at the corresponding temperature (40 ° C.), and the viscosity measurement value is the base oil. It is judged whether or not the viscosity reference value is exceeded (step 303).

As a result, when it is determined that the measured viscosity value exceeds the base oil viscosity reference value (YES in step 303), an open signal is output to the on-off valve 60, and the supply path 50 is opened. The base oil is supplied from the supply tank 40 to the hydraulic oil in the oil tank 4 through the supply path 50 (step 304).

The procedure returns to step 301, the same processing is performed, and the temperature of the hydraulic oil is constant (40 ° C.).
Is within a temperature range (for example, 40 ° C. ± 5 ° C.) that can be allowed to reach (step 30
As long as the measured viscosity value has not decreased to the base oil viscosity reference value (step 3)
(Yes in 03), the on-off valve 60 remains open, and the base oil is continuously supplied from the supply tank 40 to the hydraulic oil in the tank 4 via the supply path 50 (step 304).

Eventually, when it is determined that the measured viscosity value has decreased to the base oil viscosity reference value (step 303).
NO), a close signal is output to the on-off valve 60, the supply path 50 is closed, and supply of base oil from the supply tank 40 to the hydraulic oil in the oil tank 4 is stopped (step 305).

As described above, according to the present embodiment, the viscosity measurement value at a constant temperature is compared with the base oil viscosity reference value at the corresponding temperature, and the viscosity measurement value exceeds the base oil viscosity reference value. When the determination is made, the base oil is supplied to the hydraulic oil until the measured viscosity value is reduced to the base oil viscosity reference value, so that the base oil contained in the hydraulic oil used in the hydraulic system 1 is deteriorated. Degree
It is accurately judged based on the comparison between the measured viscosity value and the reference value under the same temperature condition, and a new base oil can be replenished in an optimum amount. As a result, the deterioration of the hydraulic oil is suppressed, and the performance of the hydraulic oil can be maintained.

(Seventh embodiment)
It is also possible to determine whether the deterioration component of the hydraulic oil is a viscosity modifier, a base oil, or both a viscosity modifier and a base oil, and perform replenishment according to the determination result. is there.

FIG. 12 shows an apparatus configuration corresponding to the apparatus configuration of FIG. 5 provided with the flow meter 70 and the apparatus configuration of FIG. 9 provided with the temperature adjusting means 30 ′. In the following, repeated description of the same parts as those in FIGS. 5 and 9 will be omitted, and the added or changed parts will be described. The configuration of the controller 10 is the same as the configuration shown in FIG.

In the following, in order to distinguish between “base oil” and “viscosity modifier”, “A” and “B” are given to the reference numerals, respectively.

The branch oil passages 9A and 9B are provided with viscosity sensors 20A and 20B, respectively. Viscosity sensors 20A and 20B detect the viscosity of the hydraulic oil. The viscosity sensors 20A and 20B are respectively provided with temperature adjusting means 30A and 30B for adjusting the temperature of the hydraulic oil to different low temperature constant temperatures Ta (for example, 40 ° C.) and high temperature constant temperature Tb (for example, 110 ° C.). Temperature control means 30A,
30B is provided with thermometers 32A and 32B for detecting the actual temperature T, respectively.

The viscosity measuring unit 11 of the controller 10 measures the viscosity of the hydraulic oil at a constant temperature Ta (40 ° C.) at a low temperature and the temperature of the hydraulic oil at a constant temperature Tb (110 ° C.) at a high temperature.

Base oil is stored in the replenishing tank 40A, and a viscosity modifier is stored in the replenishing tank 40B. The replenishment tank 40A communicates with the oil tank 4 via the supply path 50A, and the replenishment tank 40B communicates with the oil tank 4 via the supply path 50B.

Temperature control means 30'A and 30'B are provided in the replenishing tanks 40A and 40B, respectively.

On-off valves 60A and 60B are provided in the supply paths 50A and 50B, respectively.

The supply passages 50A and 50B are provided with flow meters 70A and 70B, respectively.

FIG. 13A is a graph showing the relationship L between the temperature and the viscosity of the hydraulic oil.

In FIG. 13A, the symbols mean the following.

Ta: Temperature control temperature (low temperature) of the viscosity sensor 20A
Tb: Temperature control temperature (high temperature) of the viscosity sensor 20B
A: Viscosity measurement value at a low temperature measured by the viscosity sensor 20A B: Viscosity measurement value at a high temperature measured by the viscosity sensor 20B At: Allowable range upper limit value of the viscosity measurement value at low temperature Ab: Allowable range of the viscosity measurement value at a low temperature Lower limit value Bt: Allowable range upper limit value of viscosity measurement value at high temperature Bb: Lower limit value of allowable range of viscosity measurement value at high temperature FIGS. 13B, 13C, and 13D show fresh hydraulic oil and degraded hydraulic oil. 5 is a graph showing the relationship between temperature and viscosity.

FIG. 13B shows the relationship L0 between the temperature of the fresh hydraulic oil and the hydraulic oil viscosity, and the relationship LA between the temperature and the hydraulic oil viscosity when deterioration of the base oil is dominant. When the deterioration of the base oil is dominant, LA moves to the viscosity increasing side with respect to L0. For this reason, the low temperature viscosity measurement value A at the low temperature constant temperature Ta exceeds the low temperature upper limit value At, and the high temperature viscosity measurement value B at the high temperature constant temperature Tb exceeds the high temperature upper limit value Bt.

FIG. 13 (c) shows the relationship L0 between the temperature of the fresh hydraulic fluid and the hydraulic fluid viscosity, and the relationship LB between the temperature and the hydraulic fluid viscosity when deterioration of the viscosity modifier is dominant. When the deterioration of the viscosity modifier is dominant, LB is inclined so that the viscosity on the high temperature side decreases with respect to L0. For this reason, the high-temperature viscosity measurement value B at the high temperature constant temperature Tb is lower than the high temperature lower limit Bb.

FIG. 13D shows a comparison between the relationship L0 between the temperature of the fresh hydraulic fluid and the hydraulic fluid viscosity, and the relationship LAB between the temperature and the hydraulic fluid viscosity when both the base oil and the viscosity modifier are deteriorated. ing.

When degradation of both the base oil and the viscosity modifier is observed, LAB is inclined so that the viscosity on the low temperature side increases and the viscosity on the high temperature side decreases with respect to L0. For this reason, a low constant temperature T
The low-temperature viscosity measurement value A at a exceeds the low-temperature upper limit value At, and the high-temperature viscosity measurement value B at a high constant temperature Tb is lower than the high-temperature upper limit value Bt.

Therefore, the on / off valve opening / closing control unit 13 of the controller 10 is controlled by the control start determination unit 12 at the on / off valve 6.
When it is determined that it is time to start the control of 0B, the high temperature viscosity measurement value B at the high temperature constant temperature Tb is compared with the viscosity reference value for the viscosity modifier at the corresponding temperature Tb, and the high temperature viscosity measurement value When it is determined that B is below the viscosity reference value for the viscosity modifier and the high temperature viscosity measurement value B is determined to be below the viscosity reference value for the viscosity modifier, the high temperature viscosity measurement value B is the viscosity The opening / closing of the on-off valve 60B is controlled so that the viscosity adjusting agent is replenished to the hydraulic oil in the oil tank 4 until the viscosity reference value for the adjusting agent is reached (FIGS. 13C and 13D).

Further, the on / off valve opening / closing control unit 13 of the controller 10 is operated by the control start determination unit 12 at the on / off valve 60.
When it is determined that it is time to start control of A, the viscosity measurement value A at a constant temperature Ta at a low temperature is compared with the viscosity reference value for base oil at the corresponding temperature Ta, and the low temperature viscosity measurement value A is When it is determined that the base oil viscosity reference value is exceeded, and the low temperature viscosity measurement value A is determined to exceed the base oil viscosity reference value, the low temperature viscosity measurement value A is the base oil viscosity reference. The opening / closing of the on-off valve 60A is controlled so that the base oil is replenished to the hydraulic oil until the value decreases.

Hereinafter, the procedure of the control process performed by the controller 10 will be described with reference to the flowchart shown in FIG.

First, the temperature of the hydraulic oil detected by the thermometers 32A and 32B is an allowable temperature range of a constant temperature Ta ± α at a low temperature (for example, 40 ° C. ± 5 ° C.), and an allowable temperature range of a constant temperature Tb ± α at a high temperature ( For example, it is determined whether or not the temperature is within a range of 110 ° C. ± 5 ° C. (step 401).

If the detected temperature is out of the allowable temperature range (determination NO in step 401), the on-off valve 60A,
60B remains closed (step 402), but if the detected temperature falls within the allowable temperature range (YES in step 402), the opening / closing control of the opening / closing valves 60A, 60B is started.
Next step 403 is entered.

In step 403, the viscosity measurement value A at a constant temperature Ta (40 ° C.) at a low temperature,
The base oil viscosity reference value At at the corresponding temperature Ta (40 ° C.) is compared, and it is determined whether or not the low-temperature viscosity measurement value A exceeds the base oil viscosity reference value At (step 403).

As a result, if it is determined that the low-temperature viscosity measurement value A exceeds the base oil viscosity reference value At (determination YES in step 403), then, a constant temperature Tb (110 ° C.) at a high temperature.
Viscosity measurement value B at the temperature Tb (110 ° C.) is compared with the viscosity reference value Bt for the viscosity modifier, and whether the high temperature viscosity measurement value B exceeds the viscosity reference value Bt for the viscosity modifier Judgment is made (step 404). As a result, when it is determined that the high-temperature viscosity measurement value B exceeds the viscosity reference value Bt for the viscosity modifier (determination YES in step 404), it is determined that deterioration of the base oil is dominant. Then, an open signal is output to the on-off valve 60A and the supply passage 50A is opened, and the oil tank 4 is supplied from the replenishing tank 40A through the supply passage 50A.
The base oil is replenished to the inside hydraulic oil (step 405).

Next, the timer 15 is turned on, and the time tA during which the on-off valve 60A is open is counted (step 410).

Next, the flow rate QA measured by the flow meter 70A and the time tA measured by the timer 15 are multiplied to calculate the cumulative flow rate QA · tA. Then, the cumulative flow rate reference value QA0 · tA0 corresponding to the low temperature viscosity measurement value A is read from the cumulative flow rate reference value memory 14, and the calculated cumulative flow rate QA · tA is read as the read cumulative flow rate reference value QA0 · It is determined whether or not tA0 has been reached (step 411). As long as the cumulative flow rate QA · tA is less than the cumulative flow rate reference value QA 0 · tA 0 (determination NO in step 411), the open state of the on-off valve 60A is maintained, but eventually the cumulative flow rate QA · tA becomes the cumulative flow rate reference When the value QA0 · tAT0 is reached (determination YE in step 411)
S), a close signal is output to the on-off valve 60A, the supply path 50A is closed, and the replenishment of base oil from the replenishing tank 40A to the working oil in the oil tank 4 is stopped (step 412).

If it is determined in step 403 that the low temperature viscosity measurement value A is equal to or less than the base oil viscosity reference value At (determination NO in step 403), then, a constant temperature Tb (110 ° C.) at a high temperature.
Viscosity measurement value B in the above and the viscosity reference value Bb for viscosity adjusting material at the corresponding temperature Tb (110 ° C.) are compared, and whether the high temperature viscosity measurement value B is below the viscosity reference value Bb for viscosity modifier Determination is made (step 406). As a result, when it is determined that the high-temperature viscosity measurement value B is lower than the viscosity reference value Bb for the viscosity modifier (determination YES in step 406), the deterioration of the viscosity modifier is dominant. A determination is made (FIG. 13 (c)), an open signal is output to the on-off valve 60B, the supply path 50B is opened, and the viscosity adjusting agent is supplied from the supply tank 40B to the hydraulic oil in the oil tank 4 through the supply path 50A. (Step 407).

Next, the timer 15 is turned on and the time tB during which the on-off valve 60B is open is counted (step 410).

Next, the flow rate QB measured by the flow meter 70B and the time tB measured by the timer 15 are multiplied to calculate the cumulative flow rate QB · tB. Then, the cumulative flow rate reference value QB0 · tB0 corresponding to the high temperature viscosity measurement value B is read from the cumulative flow rate reference value memory 14, and the calculated cumulative flow rate QB · tB is read as the read cumulative flow rate reference value QB0 · It is determined whether or not tB0 is reached (step 411). As long as the cumulative flow rate QB · tB is less than the cumulative flow rate reference value QB 0 · tB 0 (determination NO in step 411), the open state of the on-off valve 60B is maintained. When the value QB0 · tB0 is reached (YES in step 411),
A close signal is output to the on-off valve 60B, the supply path 50B is closed, and the supply of the viscosity adjusting agent from the supply tank 40B to the hydraulic oil in the oil tank 4 is stopped (step 412).

If it is determined in step 406 that the high-temperature viscosity measurement value B is equal to or greater than the viscosity reference value Bb for viscosity modifier (determination NO in step 406), it is determined that the hydraulic oil has not deteriorated, and the open / close Valves 60A, 60B remain closed (step 409) and the procedure is step 4
Return to 01.

If it is determined in step 404 that the high-temperature viscosity measurement value B is equal to or less than the viscosity reference value Bt for viscosity modifier (determination NO in step 404), both the base oil and the viscosity modifier are deteriorated. It is determined that this is the case (FIG. 13 (d)), an open signal is output to each of the on-off valves 60A and 60B, the supply passages 50A and 50B are opened, and the oil tank 4 is supplied from the supply tank 40A through the supply passage 50A. The base oil is replenished to the working oil, and the viscosity adjusting agent is replenished to the working oil in the oil tank 4 from the replenishing tank 40B through the supply path 50B (step 408).

Next, the timer 15 is turned on, and the times tA and tB when the on-off valves 60A and 60B are open are timed (step 410).

Next, the flow rate QA measured by the flow meter 70A and the time tA measured by the timer 15 are multiplied to calculate the cumulative flow rate QA · tA. Then, the cumulative flow rate reference value QA0 · tA0 corresponding to the low temperature viscosity measurement value A is read from the cumulative flow rate reference value memory 14, and the calculated cumulative flow rate QA · tA is read as the read cumulative flow rate reference value QA0 · It is determined whether or not tA0 is reached. Similarly, the flow rate QB measured by the flow meter 70B and the time tB measured by the timer 15 are multiplied to calculate the accumulated flow rate QB · tB. From the accumulated flow rate reference value memory 14,
The cumulative flow rate reference value QB0 · tB0 corresponding to the high temperature viscosity measurement value B is read, and it is determined whether or not the calculated cumulative flow rate QB · tB is equal to or greater than the read cumulative flow rate reference value QB0 · tB0. (Step 411). As long as the cumulative flow rate QA · tA is less than the cumulative flow rate reference value QA0 · tA0 (determination NO in step 411), the open state of the on-off valve 60A is maintained. As long as the cumulative flow rate QB · tB is less than the cumulative flow rate reference value QB0 · tB0 (determination NO in step 411), the open state of the on-off valve 60B is maintained.

When the cumulative flow rate QA · tA eventually reaches the cumulative flow rate reference value QA0 · tA0 (step 41).
1), a close signal is output to the on-off valve 60A, the supply path 50A is closed, and supply of base oil from the supply tank 40A to the hydraulic oil in the oil tank 4 is stopped. Similarly, cumulative flow rate Q
When B · tB reaches the cumulative flow rate reference value QB0 · tB0 (YES in step 411), a close signal is output to the on-off valve 60B, the supply path 50B is closed, and the operation in the oil tank 4 from the replenishment tank 40B is performed. The supply of the viscosity modifier to the oil is stopped (step 412).

Thereafter, the procedure returns to step 401 and the same processing is performed. However, if it is determined that no deterioration of the hydraulic oil is observed (determination NO in step 406), the on-off valve 60 is kept closed (step 409). ).

In the seventh embodiment, similarly to the second embodiment, flow meters 70A and 70B are provided to accurately control the opening and closing of the on-off valves 60A and 60B from the flow rate measurement values. However, it is possible to omit the flow meters 70A and 70B as in the first embodiment.

As in the third embodiment, in addition to the viscosity sensors 20A and 20B, the thermometers 32A and 32B
It is also possible to provide only.

Further, as in the fifth embodiment, the oil tank 4 may be provided with a stirrer 80.

In each of the embodiments described above, the description has been made assuming that the apparatus of the present invention is mounted on a construction machine and the method of the present invention is performed on the construction machine. However, the apparatus and method of the present invention
Any device equipped with a hydraulic system operated by hydraulic oil can be widely applied to general industrial machines and the like.

1 Hydraulic system, 10 controller, 20 (20A, 20B) Viscosity sensor, 30
(30A, 30B) Temperature control means, 40 (40A, 40B) Supply tank, 50 (50A,
50B) Supply path, 60 (60A, 60B) On-off valve, 70 (70A, 70B) Flow meter

Claims (11)

A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring means for measuring the viscosity of the hydraulic oil or the temperature and viscosity of the hydraulic oil at a constant temperature;
Compare the viscosity measurement value at a certain temperature or the viscosity measurement value at the measurement temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, and determine that the measured viscosity value is below the viscosity reference value for the viscosity modifier. Judgment means,
Storage means in which the viscosity modifier is stored;
A supply path for supplying the viscosity adjusting agent in the storage means to the hydraulic oil;
Opening and closing means for adjusting opening and closing of the supply path;
When it is determined by the determination means that the measured viscosity value is lower than the viscosity reference value for the viscosity modifier, the viscosity modifier is replenished to the hydraulic oil until the measured viscosity value reaches the viscosity reference value for the viscosity modifier. And a control means for controlling the opening and closing means. A hydraulic oil component replenishing device in a hydraulic system. Temperature control means for adjusting the temperature of the hydraulic oil to a constant temperature is provided,
The hydraulic oil component replenishing device in a hydraulic system according to claim 1, wherein the measuring means measures the viscosity of the hydraulic oil temperature-controlled by the temperature adjusting means. A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid,
Measuring means for measuring the viscosity of the hydraulic oil or the temperature and viscosity of the hydraulic oil at a constant temperature;
Judgment means that compares the viscosity measurement value at a constant temperature or the viscosity measurement value at the measurement temperature with the base oil viscosity reference value at the corresponding temperature and determines that the viscosity measurement value exceeds the base oil viscosity reference value When,
Storage means in which hydraulic oil base oil is stored;
A supply path for supplying the base oil in the storage means to the hydraulic oil;
Opening and closing means for adjusting opening and closing of the supply path;
When the determination means determines that the measured viscosity value exceeds the base oil viscosity reference value, the base oil is replenished to the hydraulic oil until the measured viscosity value drops to the base oil viscosity reference value. A hydraulic oil component replenishing device in a hydraulic system, comprising control means for controlling the opening / closing means as described above. Temperature control means for adjusting the temperature of the hydraulic oil to a constant temperature is provided,
The hydraulic oil component replenishing device in a hydraulic system according to claim 3, wherein the measuring means measures the viscosity of the hydraulic oil whose temperature is adjusted to a constant temperature by the temperature adjusting means. A hydraulic fluid component replenishment device in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring means for measuring the viscosity of the hydraulic oil at a constant temperature of high temperature and the temperature of the hydraulic oil at a constant temperature of low temperature;
A first high-temperature viscosity measurement value at a constant high temperature is compared with a viscosity reference value for a viscosity modifier at a corresponding temperature to determine that the high-temperature viscosity measurement value is lower than the viscosity reference value for a viscosity modifier. Judgment means,
A second determination means for comparing the measured viscosity value at a constant low temperature with the base oil viscosity reference value at the corresponding temperature and determining that the low temperature viscosity measured value exceeds the base oil viscosity reference value; ,
First storage means in which a viscosity modifier is stored;
A second storage means in which the base oil of the hydraulic oil is stored; a first supply path that supplies the viscosity adjusting agent in the first storage means to the hydraulic oil;
A second supply path for supplying the base oil in the second storage means to the hydraulic oil;
First opening / closing means for adjusting opening / closing of the first supply path;
Second opening / closing means for adjusting opening / closing of the second supply path;
When it is determined by the first determination means that the high-temperature viscosity measurement value is lower than the viscosity reference value for viscosity modifier, the viscosity modifier until the high-temperature viscosity measurement value reaches the viscosity reference value for viscosity modifier Controlling the first opening and closing means so that the hydraulic oil is replenished with hydraulic oil,
When the second determination means determines that the low temperature viscosity measurement value exceeds the base oil viscosity reference value, the base oil operates until the low temperature viscosity measurement value falls to the base oil viscosity reference value. A hydraulic oil component replenishing device in a hydraulic system, comprising control means for controlling the second opening / closing means so as to be replenished with oil. A flow rate measuring means for measuring the flow rate of the viscosity modifier passing through the supply path is provided,
The hydraulic oil component replenishing device in a hydraulic system according to claim 1, wherein the control means controls the opening / closing means until a cumulative value of the measured flow rate reaches a cumulative flow rate reference value corresponding to the viscosity measurement value. . A flow rate measuring means for measuring the flow rate of the base oil passing through the supply path is provided,
4. The hydraulic oil component replenishing device in a hydraulic system according to claim 3, wherein the control means controls the opening / closing means until a cumulative value of the measured flow rate reaches a cumulative flow rate reference value corresponding to the viscosity measurement value. . A first flow rate measuring means for measuring the flow rate of the viscosity adjusting agent passing through the first supply path and a second flow rate measuring means for measuring the flow rate of the base oil passing through the second supply path are provided;
The control means controls the first opening / closing means until the cumulative value of the flow rate measured by the first flow rate measurement means reaches the cumulative flow rate reference value corresponding to the high temperature viscosity measurement value,
6. The hydraulic pressure according to claim 5, wherein the second opening / closing means is controlled until the cumulative value of the flow rate measured by the second flow rate measuring means reaches the cumulative flow rate reference value corresponding to the low temperature viscosity measurement value. Hydraulic oil component replenishment device in the system. A hydraulic fluid component replenishment method in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring the viscosity of the hydraulic oil at a constant temperature or the temperature and viscosity of the hydraulic oil;
Compare the viscosity measurement value at a certain temperature or the viscosity measurement value at the measurement temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, and determine that the measured viscosity value is below the viscosity reference value for the viscosity modifier. Steps,
Replenishing the hydraulic fluid with the viscosity modifier until the viscosity measurement value reaches the viscosity reference value for the viscosity modifier when it is determined that the measured viscosity value is lower than the viscosity reference value for the viscosity modifier. A hydraulic oil component replenishing method in a hydraulic system. A hydraulic oil component replenishment method in a hydraulic system operated by hydraulic oil,
Measuring the viscosity of the hydraulic oil at a constant temperature or the temperature and viscosity of the hydraulic oil;
Comparing the viscosity measurement value at a constant temperature or the viscosity measurement value at the measurement temperature with the base oil viscosity reference value at the corresponding temperature, and determining that the viscosity measurement value exceeds the base oil viscosity reference value; ,
Replenishing the base oil with the base oil until the viscosity measurement value falls to the base oil viscosity reference value when it is determined that the viscosity measurement value exceeds the base oil viscosity reference value. A hydraulic oil component replenishing method in a hydraulic system. A hydraulic fluid component replenishment method in a hydraulic system operated by hydraulic fluid including a viscosity modifier,
Measuring the viscosity of the hydraulic oil at a constant temperature of high temperature and the temperature of the hydraulic oil at a constant temperature of low temperature;
Comparing the measured viscosity value at a constant temperature with the viscosity reference value for the viscosity modifier at the corresponding temperature, judging that the measured high temperature viscosity value is lower than the viscosity reference value for the viscosity modifier,
Comparing the viscosity measurement value at a low constant temperature with the base oil viscosity reference value at the corresponding temperature, and determining that the low temperature viscosity measurement value exceeds the base oil viscosity reference value;
When it is determined that the high temperature viscosity measurement value is lower than the viscosity standard value for the viscosity modifier, the viscosity oil is replenished to the hydraulic oil until the high temperature viscosity measurement value reaches the viscosity standard value for the viscosity modifier,
Replenishing the base oil with the base oil until the measured viscosity value decreases to the base oil viscosity reference value when it is determined that the low temperature viscosity measurement value exceeds the base oil viscosity reference value. A hydraulic oil component replenishing method in a hydraulic system.

Images