JP2021148271A - Working fluid diagnosis system and working fluid diagnosis method - Google Patents

Abstract

To provide a working fluid diagnosis system which can determine the proper exchange timing of a working fluid, and a working fluid diagnosis method.SOLUTION: A working fluid diagnosis system 10 comprises: a pressure measurement unit 40 for measuring the pressure of a working fluid at an operation of a fluid pressure device 12; a counting unit 42 for counting a working time and a non-working time of the fluid pressure device 12; a temperature measurement unit 44 for measuring a temperature of the working fluid at an operation of the fluid pressure device 12, and a temperature of the working fluid at non-operation; and a control unit 28 for acquiring a deterioration degree of the working fluid according to the pressure, the time and the temperatures which are measured by the pressure measurement unit 40, the counting unit 42 and the temperature measurement unit 44.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hydraulic fluid diagnostic system and a hydraulic fluid diagnostic method for hydraulic devices.

Conventionally, a hydraulic pressure device has been used for a lifting device for a truck bed and a cargo handling device such as a forklift. Hydraulic devices are also used in equipment such as cranes and lifts for equipment. In the hydraulic device, the hydraulic fluid is an energy transfer medium for driving the hydraulic cylinder. In addition, the hydraulic fluid is used as a lubricant for cargo handling devices and the like.

The hydraulic fluid deteriorates due to oxidation of the hydraulic fluid or contamination of the hydraulic fluid with foreign matter. The viscosity of the hydraulic fluid changes, the lubricity deteriorates, the performance of hydraulic equipment deteriorates, and it causes a failure. Therefore, it is necessary to replace the deteriorated hydraulic fluid with a new hydraulic fluid. In order to inspect the degree of deterioration of the hydraulic fluid of the hydraulic device used in equipment, the hydraulic fluid is periodically extracted, the extracted hydraulic fluid is measured with a dedicated device, and the hydraulic fluid is calculated based on the result. I'm exchanging.

JP 2016-113819 (paragraph 0022)

For hydraulic devices used in trucks, forklifts, etc., it is not practical in terms of cost to inspect the deterioration of the hydraulic fluid with a dedicated device as described above. The hydraulic fluid is replaced regularly regardless of the deterioration status of the hydraulic fluid. When the hydraulic fluid is replaced regularly, if the hydraulic fluid deteriorates more than expected before the hydraulic fluid is replaced, the performance of the hydraulic device deteriorates or fails. On the contrary, if the hydraulic fluid is not deteriorated more than expected, the hydraulic fluid will be replaced unnecessarily. Therefore, it has been an issue to determine the appropriate replacement time of the hydraulic fluid.

Patent Document 1 attaches a sensor for measuring the temperature, viscosity, density and dielectric constant of a working liquid to a hydraulic device of a working machine such as a hydraulic excavator. Patent Document 1 is applied to a hydraulic device of a work machine such as a hydraulic excavator, and attaching the sensor of Patent Document 1 to a hydraulic device such as a truck leads to an increase in cost and is economically unfavorable. The hydraulic pressure device may become large due to the sensor and may not be attached to a truck or the like.

An object of the present invention is to provide a working fluid diagnostic system and a hydraulic fluid diagnostic method capable of determining an appropriate hydraulic fluid replacement time.

In order to solve the above problems, the working fluid diagnostic system and the working fluid diagnostic method according to the present invention have the following configurations.

The hydraulic fluid diagnostic system of the present invention comprises a hydraulic cylinder, a tank for storing the hydraulic fluid, a pump for discharging the hydraulic fluid stored in the tank toward the hydraulic cylinder, and a flow of the hydraulic fluid. A hydraulic fluid diagnostic system for a hydraulic device equipped with a control valve, a pressure measuring unit for measuring the pressure of the hydraulic fluid when the hydraulic device is operating, and a time measuring and operating time of the hydraulic device. A time measuring unit that measures the non-operating time, a temperature measuring unit that measures the temperature of the working fluid when the hydraulic pressure device is operating, and a temperature measuring unit that measures the temperature of the working liquid when the hydraulic pressure device is not operating, and the pressure measuring unit, the measuring unit, and the temperature measuring unit. It is provided with a control unit that obtains the degree of deterioration of the working fluid according to the pressure, time, and temperature measured in.

The hydraulic fluid diagnostic method of the present invention includes a step of measuring the pressure of the hydraulic fluid when the hydraulic pressure device is operating by a pressure measuring unit, and a step of measuring the operating time and non-operating time of the hydraulic pressure device by the measuring unit. , The step of measuring the temperature of the hydraulic fluid when the hydraulic pressure device is operating and the temperature of the hydraulic fluid when it is not operating by the temperature measuring unit, and the pressure and time measured by the pressure measuring unit, the measuring unit and the temperature measuring unit. The control unit includes a step of determining the degree of deterioration of the working fluid according to the temperature.

According to the present invention, the degree of deterioration of the working fluid can be determined with a simple structure. Since the hydraulic fluid can be replaced at an appropriate time, it is possible to prevent performance deterioration and failure of the hydraulic device due to excessive deterioration of the hydraulic fluid, and it is not necessary to replace the hydraulic fluid even though it has not deteriorated.

It is a figure which shows the structure of the hydraulic fluid diagnostic system of this application. It is a graph which shows the degree of deterioration of the working fluid with time of each temperature when the pressure is P1. It is a graph which shows the degree of deterioration of the working fluid with time of each temperature when the pressure is P2. It is a graph which shows the degree of deterioration of the hydraulic fluid at each temperature time when the hydraulic pressure device is not operating. It is a graph which integrated the degree of deterioration of a working fluid. It is a figure which shows the structure of the working fluid diagnostic system provided with a communication part. It is a figure which shows the structure of the working fluid diagnostic system which determines the degree of deterioration in a server.

The working fluid diagnostic system and the working fluid diagnostic method according to the embodiment of the present invention will be described with reference to the drawings. Although a plurality of embodiments will be described, the same means may be designated by the same reference numerals and the description thereof may be omitted even in different embodiments.

[Embodiment 1]
The hydraulic fluid diagnostic system 10 of the present application shown in FIG. 1 diagnoses deterioration of the hydraulic fluid of the hydraulic pressure device 12. The hydraulic pressure device 12 is incorporated in a travelable device (vehicle) such as a truck, a forklift, or a backhoe.

[Hydraulic device]
An example of the hydraulic device 12 is a hydraulic cylinder 14, a tank 16 for storing a hydraulic fluid (hydraulic oil), a pump 18 for discharging the hydraulic fluid stored in the tank 16 toward the hydraulic cylinder 14, and a hydraulic fluid. 20, 22, 24, 26 and a control unit 28 for controlling the flow of the above.

In the hydraulic cylinder 14, the piston in the cylinder moves linearly when the hydraulic fluid is supplied or discharged into the hydraulic cylinder 14. A piston rod is attached to the piston, and the linear motion of the piston moves the parts attached to the tip of the piston rod. For example, when the load receiving table is attached to the tip of the piston rod, the load receiving table can be raised and lowered.

The hydraulic fluid used in the hydraulic device 12 is a petroleum-based (mineral-based) hydraulic fluid based on refined petroleum, a synthetic ester, a synthetic hydraulic fluid based on polyglycol, etc., as a main component. A water-soluble (water-containing system) working fluid containing water is included. At least one of a rust inhibitor, an antioxidant and an antifoaming agent may be added to the working fluid. The working fluid to be used is selected according to the configuration of the hydraulic pressure device 12.

The pump 18 discharges the hydraulic fluid stored in the tank 16 toward the hydraulic cylinder 14. The pump 16 is driven by the power of the motor 30. A DC brushless motor is used as the motor 30, but other types of motors 30 may be used as long as the pump 18 can be driven.

The piping for supplying the hydraulic fluid from the pump 18 to the hydraulic cylinder 14 is referred to as the first line 32, and the piping for discharging the hydraulic fluid to the tank 16 is referred to as the second line 34 and the third line 36. The second line 34 and the third line 36 may be merged into one line, or the second line 34 and the third line 36 may remain separated. The second line 34 and the third line 36 are connected to the first line 32. The second line 34 is connected to the hydraulic cylinder 14 side of the third line 36.

The valves 20, 22, 24, 26 include a directional control valve 20, a pressure control valve (relief valve) 22, and a check valve (check valve) 24, 26. The directional control valve 20 is provided in the second line 34. The pressure control valve 22 is provided on the third line 36. There are two check valves 24 and 26, and the check valves 24 and 26 are provided in the first line 32. The check valve 24 is provided between the portion where the second line 34 and the third line 36 are connected, and the check valve 26 is provided between the third line 36 and the pump 18.

The directional control valve 20 is closed when the check valve is selected and closed when the exciting coil is not excited, and is opened when the exciting coil is excited. When the pump 18 discharges the liquid, the hydraulic liquid is supplied to the hydraulic cylinder 14 if the directional control valve 20 is closed. When the directional control valve 20 is opened, a path of the hydraulic fluid is formed from the hydraulic cylinder 14 to the tank 16, and the hydraulic fluid flows from the hydraulic cylinder 14 to the tank 16 via the directional control valve 20. By switching the opening and closing of the directional control valve 20, the supply and discharge of the hydraulic fluid to the hydraulic cylinder 14 can be switched. For example, when a load receiving table is attached to the tip of the piston rod of the hydraulic cylinder 14, the load receiving table rises when the direction control valve 20 is closed. When the direction control valve 20 is further opened, the hydraulic fluid is discharged from the hydraulic cylinder 14 under the weight of the load receiving table, and the load receiving table is lowered.

The pressure control valve 22 is a valve for controlling the pressure of the hydraulic fluid in the first line 32 so as not to exceed a constant pressure. After the maximum amount of the hydraulic fluid discharged from the pump 18 is supplied to the hydraulic cylinder 14, the hydraulic fluid does not enter the hydraulic cylinder 14. In this case, the pressure of the hydraulic fluid in the first line 32 rises, and there is a risk that the parts constituting the hydraulic device 12 such as the pump 18 and the hydraulic cylinder 14 will be damaged. The pressure control valve 22 is opened when the pressure of the hydraulic fluid in the first line 32 reaches a constant value. The hydraulic fluid flows from the first line 32 to the tank 16 via the pressure control valve 22, and the pressure of the hydraulic fluid in the first line 32 does not exceed a certain value. The pressure control valve 22 holds the hydraulic fluid if the pressure of the hydraulic fluid in the first line 32 does not exceed a certain value, and the pressure of the hydraulic fluid is held.

The check valves 24 and 26 open when the hydraulic fluid flows from the pump 18 toward the hydraulic cylinder 14, and close when the hydraulic fluid tries to flow back. The check valves 24 and 26 prevent the hydraulic fluid from flowing back into the pump 18 and hold the fluid supplied to the hydraulic cylinder 14.

The control unit 28 controls the power supply to the motor 30 and the supply of the exciting current to the exciting coil of the directional control valve 20 (not shown). The control unit 28 uses an arithmetic circuit such as a CPU (Central Processing Unit) or a PLC (Programmable Logic Controller). The control unit 28 turns on or off the motor 30 to excite or de-energize the exciting coil.

The hydraulic device 12 may include parts such as a diaphragm and a filter, if necessary.

[Operating fluid diagnostic system]
The hydraulic fluid diagnostic system 10 of the present application includes a pressure measuring unit 40 that measures the pressure of the hydraulic fluid, a time measuring unit 42 that measures the operating time and the non-operating time of the hydraulic pressure device 12, and a temperature measuring unit 44 that measures the temperature of the hydraulic fluid. To be equipped with.

The pressure measuring unit 40 measures the pressure of the liquid in the hydraulic cylinder 14. In FIG. 1, the pressure measuring unit 40 is connected between the hydraulic cylinder 14 and the check valve 24 in the first line 32, but if the pressure of the hydraulic cylinder 14 can be measured, the position where the pressure measuring unit 40 is connected is limited. Not done. The pressure measuring unit 40 can use a Bourdon tube pressure gauge, a diaphragm type pressure gauge, or the like, but the pressure measuring unit 40 is not particularly limited as long as the pressure of the liquid can be measured. The pressure value measured by the pressure measuring unit 40 is input to the control unit 28.

The timing unit 42 measures the operating time when the hydraulic pressure device 12 is operating and the non-operating time when the hydraulic pressure device 12 is not operating. The timekeeping unit 42 is a timer. The time measured by the time measuring unit 42 is input to the control unit 28. The timekeeping unit 42 starts or stops timing according to the signal of the control unit 28. When the clocking of the operating time is started, the timing of the non-operating time is stopped, and when the timing of the operating time is stopped, the timing of the non-operating time is started. The time measuring unit 42 measures either the operating time or the non-operating time. For example, at the same time that the control unit 28 drives the motor 30, a signal is input from the control unit 28 to the timekeeping unit 42, and the timekeeping unit 42 clocks the operating time. Further, at the same time that the control unit 28 stops the motor 30, a signal is input from the control unit 28 to the timing unit 42, and the timing unit 42 clocks the non-operating time.

The temperature measuring unit 44 measures the temperature of the working fluid. The place where the temperature of the working fluid is measured, such as the tank 16 or the first line 32, is not limited. The measured temperature is input to the control unit 28.

The working fluid diagnostic system 10 includes a storage device 46. As the storage device 46, a semiconductor storage device, a magnetic storage device, or an optical storage device can be used. Data regarding the degree of deterioration of the working fluid is stored in the storage device 46. The data on the degree of deterioration is stored separately when the hydraulic pressure device 12 is operating and when it is not operating.

The data on the degree of deterioration of the hydraulic device 12 during operation is the degree of deterioration of the working liquid over time with respect to pressure and temperature. This is because when the hydraulic device 12 is operated, the load pressure on the hydraulic cylinder 14, the temperature of the hydraulic fluid, and the operating time affect the deterioration of the hydraulic fluid. Examples of graphs of data on the degree of deterioration of the hydraulic fluid during operation of the hydraulic pressure device 12 are shown in FIGS. 2A and 2B. In FIG. 2A, it is assumed that the pressure measured by the pressure measuring unit 40 is P1, and in FIG. 2B, the pressure measured by the pressure measuring unit 40 is P2. 2A and 2B show the same hydraulic pressure device 12 and the same hydraulic fluid. Each of FIGS. 2A and 2B shows the degree of deterioration of the working fluid with respect to time when the temperature of the working fluid is t1, t2, and t3. As shown in FIGS. 2A and 2B, the degree of deterioration differs depending on the pressure and temperature of the hydraulic fluid in the hydraulic cylinder 14.

The data on the degree of deterioration of the hydraulic device 12 when it is not operating is the degree of deterioration of the working liquid over time with respect to the temperature. This is because the temperature and time of the hydraulic fluid affect the deterioration of the hydraulic fluid when the hydraulic pressure device 12 is not operating. FIG. 3 shows an example of graphing data on the degree of deterioration of the hydraulic device 12 when it is not operating. FIG. 3 shows the degree of deterioration of the hydraulic fluid with respect to time when the temperature of the hydraulic fluid is t1, t2, and t3. It can be seen that the degree of deterioration differs depending on the temperature of the working fluid. The scales of the time axes of FIGS. 2A and 2B and FIG. 3 are different.

As for the degree of deterioration in FIGS. 2A, 2B, and 3, the degree of deterioration that requires replacement of the working fluid is 100%. The degree of deterioration is a value obtained by comprehensively judging the viscosity of the working liquid, the degree of oxidation of the working liquid, the number of foreign substances in a predetermined amount, the amount of light transmitted, and the like. The lower the viscosity, the higher the degree of deterioration, the higher the degree of oxidation of the working fluid, the higher the degree of deterioration, the larger the number of foreign substances, the higher the degree of deterioration, and the smaller the amount of light transmitted, the higher the degree of deterioration. It gets higher. The degree of deterioration of the working liquid is stored in the storage device 46 by actually operating and not operating the hydraulic pressure device 12 to obtain a large number of data on the degree of deterioration.

The control unit 28 obtains the degree of deterioration of the hydraulic fluid in addition to the control of the hydraulic pressure device 12 described above. The data stored in the storage device 46 is used to determine the degree of deterioration of the working fluid. The pressure is input from the pressure measuring unit 40 to the control unit 28, the operating time or non-operating time is input from the timing unit 42, and the temperature is input from the temperature measuring unit 44. The control unit 28 uses these values to determine the degree of deterioration of the working fluid.

An example of a method for determining the degree of deterioration of the working fluid will be described. For example, suppose that the pressure measured by the pressure measuring unit 40 is P1, the operating time measured by the time measuring unit 44 is T1, and the temperature measured by the temperature measuring unit 44 is t1. The control unit 28 refers to the data in which the pressure is P1 and the temperature is t1 from the data stored in the storage device 46. In this case, it is the data of t1 of the graph of FIG. 2A. In the data, the degree of deterioration when the time has passed from 0 to T1 is referred to. In the graph of FIG. 2A, the degree of deterioration is 50% when the temperature is t1 and the time is T1. That is, the control unit 28 sets the degree of deterioration of the hydraulic fluid at that time to 50%. FIG. 4 is a graph showing the degree of deterioration obtained by the control unit 28, and the degree of deterioration at time T1 is 50%.

Next, it is assumed that the hydraulic pressure device 12 is inoperable. Let T2 be the time from non-operation to replacement of operation. At this time, the temperature input from the temperature measuring unit 44 to the control unit 28 is set to t1. The control unit 28 obtains the degree of deterioration when the time T2 elapses from the time of the degree of deterioration of 50% at the temperature t1. In the graph of the temperature t1 of FIG. 3, the degree of deterioration of the time T2 has elapsed from the time of 50% of the degree of deterioration of the working fluid is 60%. As shown in FIG. 4, from time T1 to time T1 + T2, a portion of 50% to 60% of the degree of deterioration of the graph of FIG. 3 is added, and the degree of deterioration becomes 60%.

Further, it is assumed that the hydraulic pressure device 12 is operated, the pressure is P1, the operating time is T3, and the temperature is t1. The control unit 28 refers to the data in which the pressure is P1 and the temperature is t1 from the data stored in the storage device 46. Since the working fluid has deteriorated to 60% as described above, the degree of deterioration when the time T3 elapses from the time when the degree of deterioration is 60% is obtained. In the graph of FIG. 2A, the degree of deterioration is 100% when the time T3 elapses from the time when the degree of deterioration is 60%. Further, also in the graph of FIG. 4, 60% to 100% of the deterioration degree of the graph of FIG. 2A is added from the time T1 + T2, and the deterioration degree of the time T1 + T2 + T3 is 100%.

The control unit 28 obtains the degree of deterioration by referring to the data stored in the storage device 46 as described above and adding the degree of deterioration of the working fluid with the passage of time. When adding the degree of deterioration, the data used changes when the operation changes to non-operation, the pressure changes, or the temperature changes. When the data is changed, the data is added from the same degree of deterioration of the changed data.

In order for the control unit 28 to obtain the degree of deterioration, the degree of deterioration may be stored in the storage device 46. The control unit 28 rewrites the degree of deterioration of the storage device 46 each time the degree of deterioration is obtained. As the storage device 46 that stores the degree of deterioration, a storage device 46 that stores data may be used, or a storage device may be separately provided.

A reset switch 48 for returning the degree of deterioration of the working fluid to 0% is provided. When the signal of the reset switch 48 is input to the control unit 28, the degree of deterioration stored in the storage device 46 by the control unit 28 is rewritten to 0%. When the operator presses the reset switch 48 when the hydraulic fluid is replaced, the degree of deterioration becomes 0%, and the control unit 28 newly obtains the degree of deterioration.

The working fluid diagnostic system 10 includes a display device, a speaker, or both (not shown). When the control unit 28 obtains the degree of deterioration, the display device displays the degree of deterioration, and when the degree of deterioration reaches an arbitrary degree of deterioration set in advance, a display requesting replacement of the working fluid can be performed, or a speaker can be used. It emits an alarm sound.

[Working fluid diagnostic method]
A hydraulic fluid diagnostic method using the hydraulic fluid diagnostic system 10 will be described. (1) The control unit 28 drives the motor 30 and controls the opening and closing of the directional control valve 22, so that the hydraulic pressure device 12 operates. Further, when the control unit 28 stops driving the motor 30 and opening / closing the direction control valve 20, the hydraulic pressure device 12 is deactivated.

(2) When the hydraulic pressure device 12 is operating, the pressure measured by the pressure measuring unit 40, the time measured by the time measuring unit 42, and the temperature measured by the temperature measuring unit 44 are input to the control unit 28. When the hydraulic pressure device 12 is not operating, the time measured by the time measuring unit 42 and the temperature measured by the temperature measuring unit 44 are input to the control unit 28.

(3) The control unit 28 refers to the data using the input pressure, time, and temperature, and obtains the degree of deterioration of the working fluid. When the hydraulic pressure device 12 is operating as described above, the degree of deterioration is obtained by referring to the data of the degree of deterioration from the pressure, time, and temperature. Further, when the hydraulic pressure device 12 is not operating, the degree of deterioration is obtained by referring to the data of the degree of deterioration from the time and temperature.

(4) The control unit 28 stores the degree of deterioration in the storage device 46. By memorizing the degree of deterioration, the next time the degree of deterioration is obtained, the degree of deterioration is added to the degree of deterioration as described above. For example, if the degree of deterioration stored in the storage device 46 is 50%, the degree of deterioration is obtained from the 50%.

(5) When the degree of deterioration reaches 100%, a display requesting replacement of the working fluid is displayed from the display device, the speaker, or both, or an alarm sound is emitted.

As described above, in the present application, the degree of deterioration of the working fluid can be determined with a simple configuration. Since the hydraulic fluid can be replaced at an appropriate time, it is possible to prevent performance deterioration and failure of the hydraulic device 12 due to excessive deterioration of the hydraulic fluid, and it is not necessary to replace the hydraulic fluid even though it has not deteriorated.

[Embodiment 2]
The hydraulic pressure device 12 described in the first embodiment is an example and is not limited. Even if there are a plurality of hydraulic cylinders 14 or a plurality of directional control valves 20, the pressure and temperature of the hydraulic fluid in the hydraulic device 12 can be measured, and the operating time and non-operating time of the hydraulic device 12 can be measured. The configuration of the hydraulic pressure device 12 is not limited as long as it can be timed.

[Embodiment 3]
The graphs shown in FIGS. 2A, 2B, and 3 are data based on the data stored in the storage device 46. An approximate expression may be obtained from this data by the least squares method or the like, and the data may be stored as an approximate expression. The control unit 28 applies the pressure, time, and temperature to the approximate expression to obtain the degree of deterioration.

[Embodiment 4]
The working fluid diagnostic system 50 of FIG. 5 includes a communication unit 52 that transmits data on the degree of deterioration obtained by the control unit 28. The degree of deterioration obtained by the control unit 28 is transmitted from the communication unit 52 to the host computer 56 via the network 54. The data of the degree of deterioration is stored in the storage device of the host computer 56. The status of the hydraulic device 12 can be monitored via the network 54.

[Embodiment 5]
The working fluid diagnostic system 60 of FIG. 6 includes a communication unit 52 that transmits the pressure measured by the pressure measuring unit 40, the time measured by the time measuring unit 42, and the temperature measured by the temperature measuring unit 44. The host computer 56 has the function of the control unit 28, and the storage device of the host computer 56 has the function of the storage device. The pressure, time, and temperature are transmitted to the host computer 56 via the network 54, and the host computer 56 refers to the data stored in the storage device to determine the degree of deterioration of the working fluid. When the degree of deterioration of the working fluid reaches 100%, data is transmitted from the host computer 56 to the hydraulic pressure device 12 via the network 54, and a display requesting replacement of the working fluid is displayed from the display device, the speaker, or both. , Sounds an alarm.

By using the network 54, it is possible to determine the degree of deterioration of the hydraulic fluid of the plurality of hydraulic devices 12. Therefore, the configuration of the hydraulic pressure device 12 and the type of the hydraulic fluid may be included in the data stored in the storage device of the host computer 56. If the configuration of the hydraulic device 12 and the type of the hydraulic fluid are different, the degree of deterioration of the hydraulic fluid may differ even if the pressure, time, and temperature are the same. Therefore, data on the degree of deterioration of the hydraulic fluid with respect to time is stored according to the configuration of the hydraulic pressure device 12, the type of the hydraulic fluid, the pressure and the temperature. By including the configuration of the hydraulic pressure device 12 and the type of the hydraulic fluid in the data transmitted by the communication unit 52, the data can be referred to by the host computer 56.

The working fluid diagnostic systems 50 and 60 communicate via the network 54, and may be equipped with GPS so that the position of the hydraulic pressure device 12 can be known. The communication unit 52 adds GPS information and transmits data.

(Clause 1) The hydraulic fluid diagnostic system according to one aspect includes a hydraulic cylinder, a tank for storing the hydraulic fluid, a pump for discharging the hydraulic fluid stored in the tank toward the hydraulic cylinder, and the like. A hydraulic fluid diagnostic system of a hydraulic pressure device including a valve for controlling the flow of the hydraulic fluid, a pressure measuring unit for measuring the pressure of the hydraulic fluid when the hydraulic fluid is operating, and the hydraulic pressure device. A time measuring unit for measuring the operating time and a non-operating time, a temperature measuring unit for measuring the temperature of the working fluid when the hydraulic pressure device is operating and the temperature of the working fluid when the hydraulic pressure device is not operating, and the pressure measuring unit. It is provided with a control unit that obtains the degree of deterioration of the working fluid according to the pressure, time, and temperature measured by the time measuring unit and the temperature measuring unit.

According to the hydraulic fluid diagnostic system described in the first item, the degree of deterioration of the hydraulic fluid is required according to the pressure, time and temperature, the system configuration is simple, and the cost increase of the hydraulic pressure device is small. The hydraulic fluid can be replaced at an appropriate time, failure of the hydraulic pressure device can be prevented, and unnecessary replacement of the hydraulic fluid can be prevented.

(Item 2) Data showing deterioration of the hydraulic fluid over time with respect to the pressure and temperature of the hydraulic fluid during operation of the hydraulic device, and deterioration over time with respect to the temperature of the hydraulic fluid when the hydraulic pressure device is not operating. A storage device that stores the indicated data is provided, and the control unit applies the pressure, time, and temperature measured by the pressure measuring unit, the measuring unit, and the temperature measuring unit to the data stored in the storage device, and the degree of deterioration of the working fluid is applied. Ask for.

According to the working fluid diagnostic system described in the second item, only the data indicating the degree of deterioration is stored in the storage device, and the configuration is not complicated.

(Item 3) The hydraulic device is provided in a movable device.

According to the hydraulic fluid diagnostic system described in paragraph 3, it can be applied to a hydraulic device of a movable device (vehicle), and the hydraulic fluid of the hydraulic device of a vehicle can be replaced at an appropriate time.

(Item 4) A communication unit for communicating the pressure, time and temperature measured by the pressure measuring unit, the time measuring unit and the temperature measuring unit is provided.

According to the hydraulic fluid diagnostic system described in paragraph 4, the status of the hydraulic fluid device can be monitored even in a remote location.

(Clause 5) The hydraulic fluid diagnostic method according to one aspect includes a hydraulic cylinder, a tank for storing the hydraulic fluid, a pump for discharging the hydraulic fluid stored in the tank toward the hydraulic cylinder, and the like. A method for diagnosing a hydraulic fluid of a hydraulic pressure device including a valve for controlling the flow of the hydraulic fluid, the step of measuring the pressure of the hydraulic fluid at the time of operation of the hydraulic fluid with a pressure measuring unit, and the liquid. The step of measuring the operating time and the non-operating time of the pressure device by the measuring unit, the step of measuring the temperature of the operating fluid when the hydraulic device is operating and the temperature of the operating fluid when not operating, and the step of measuring the temperature of the operating fluid when the hydraulic device is not operating, and the above. The control unit includes a step of determining the degree of deterioration of the working fluid according to the pressure, time, and temperature measured by the pressure measuring unit, the measuring unit, and the temperature measuring unit.

According to the hydraulic fluid diagnostic method described in item 5, the hydraulic fluid can be replaced at an appropriate time, failure of the hydraulic pressure device can be prevented, and unnecessary replacement of the hydraulic fluid can be prevented.

(Section 6) Data showing deterioration of the hydraulic fluid over time with respect to the pressure and temperature of the hydraulic fluid during operation of the hydraulic device, and deterioration over time with respect to the temperature of the hydraulic fluid when the hydraulic pressure device is not operating. A storage device that stores the indicated data is provided, and the step of determining the degree of deterioration of the working fluid applies the measured pressure, time, and temperature with the data stored in the storage device to determine the degree of deterioration of the working fluid.

According to the working fluid diagnostic method described in Section 6, the degree of deterioration is obtained using the stored data indicating the degree of deterioration, and the configuration is not complicated.

(Item 7) The hydraulic device is provided in a movable device.

According to the hydraulic fluid diagnostic method described in paragraph 7, it can be applied to a hydraulic device of a movable device (vehicle), and the hydraulic fluid of the hydraulic device of a vehicle can be replaced at an appropriate time.

(Item 8) The step of communicating the measured pressure, time and temperature by the communication unit is included.

According to the hydraulic fluid diagnostic method described in item 8, the degree of deterioration of the hydraulic fluid of the hydraulic device can be monitored at a remote location by communication.

In addition, the present invention can be carried out in a mode in which various improvements, modifications and changes are made based on the knowledge of those skilled in the art without departing from the gist thereof.

10, 50, 60: Hydraulic liquid diagnostic system 12: Hydraulic device 14: Hydraulic cylinder 16: Tank 18: Pump 20: Direction control valve 22: Pressure control valve 24, 26: Check valve 28: Control unit 30: Motor 32 , 34, 36: Line 40: Pressure measuring unit 42: Measuring unit 44: Temperature measuring unit 46: Storage device 48: Switch 52: Communication unit 54: Network 56: Host computer

Claims (8)

Hydraulic cylinder and
A tank that stores the hydraulic fluid and
A pump that discharges the hydraulic fluid stored in the tank toward the hydraulic cylinder,
A valve that controls the flow of the hydraulic fluid and
It is a hydraulic fluid diagnostic system of a hydraulic device equipped with
A pressure measuring unit that measures the pressure of the working fluid when the hydraulic pressure device is operating,
A timekeeping unit that measures the operating time and non-operating time of the hydraulic device,
A temperature measuring unit that measures the temperature of the working fluid when the hydraulic pressure device is operating and the temperature of the hydraulic fluid when it is not operating, and
A control unit that obtains the degree of deterioration of the working fluid according to the pressure, time, and temperature measured by the pressure measuring unit, the time measuring unit, and the temperature measuring unit.
Hydraulic fluid diagnostic system equipped with. Data showing deterioration of the working fluid with time with respect to the pressure and temperature of the hydraulic fluid during operation of the hydraulic device and data showing deterioration with time with respect to the temperature of the hydraulic fluid with respect to the temperature of the hydraulic fluid during non-operation of the hydraulic device were stored. Equipped with a storage device
The hydraulic fluid diagnostic system according to claim 1, wherein the control unit applies the pressure, time, and temperature measured by the pressure measuring unit, the time measuring unit, and the temperature measuring unit with the data stored in the storage device to obtain the degree of deterioration of the hydraulic fluid. .. The hydraulic fluid diagnostic system according to claim 1 or 2, wherein the hydraulic device is provided in a movable device. The hydraulic fluid diagnostic system according to any one of claims 1 to 3, further comprising a communication unit for communicating the pressure, time and temperature measured by the pressure measuring unit, the time measuring unit and the temperature measuring unit. Hydraulic cylinder and
A tank that stores the hydraulic fluid and
A pump that discharges the hydraulic fluid stored in the tank toward the hydraulic cylinder,
A valve that controls the flow of the hydraulic fluid and
It is a method of diagnosing the working fluid of a hydraulic device equipped with
The step of measuring the pressure of the working liquid at the time of operating the hydraulic pressure device with the pressure measuring unit, and
A step of measuring the operating time and the non-operating time of the hydraulic device in the time measuring unit, and
A step of measuring the temperature of the hydraulic fluid when the hydraulic pressure device is operating and the temperature of the hydraulic fluid when it is not operating by the temperature measuring unit, and
A step in which the control unit obtains the degree of deterioration of the working fluid according to the pressure, time, and temperature measured by the pressure measuring unit, the time measuring unit, and the temperature measuring unit.
A hydraulic fluid diagnostic method. Data showing deterioration of the working fluid with time with respect to the pressure and temperature of the hydraulic fluid during operation of the hydraulic device and data showing deterioration with time with respect to the temperature of the hydraulic fluid with respect to the temperature of the hydraulic fluid during non-operation of the hydraulic device were stored. Equipped with a storage device
The method for diagnosing a working fluid according to claim 5, wherein the step of determining the degree of deterioration of the working fluid applies the measured pressure, time, and temperature to the data stored in the storage device to obtain the degree of deterioration of the working fluid. The method for diagnosing a working fluid according to claim 5 or 6, wherein the hydraulic device is provided in a movable device. The method for diagnosing a working fluid according to any one of claims 5 to 7, which comprises a step of communicating the measured pressure, time and temperature by a communication unit.

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