JP7009408B2 - Work machine - Google Patents

Description

The present invention relates to a work machine, and more particularly to a work machine such as a hydraulic excavator provided with a plurality of parts lubricated by being supplied with oil.

Patent Document 1 states that "a system for managing maintenance work of a work machine including at least one replaceable part, based on a change in a first parameter that reflects the wear state of the part. The second life of the component is based on the first life prediction unit that predicts the first life of the component, the second parameter that reflects the cumulative load of the component, and the preset lifetime cumulative load. By selecting the shorter life of the predicted first life and the second life as the life of the part, the second life prediction unit predicts the order of the maintenance work of the part. A maintenance work management system for work machines equipped with a ranking setting unit for setting the above is described.

Japanese Patent No. 4717579

In engines mounted on work machines such as hydraulic excavators, and hydraulic equipment such as hydraulic pumps and hydraulic cylinders, oil supplied for lubricating parts by repeating high-load operations such as excavation (for example). For example, engine oil) and oil used as a power transmission medium (for example, hydraulic oil for hydraulic circuits) deteriorate. The deterioration state of this oil also changes depending on the usage environment and operating state of the work machine. For example, the seal parts are damaged, and foreign matter is suddenly mixed in from the inside and outside of the machine, so that the deterioration of the oil progresses. In addition, deterioration may progress if the oil is used as it is without being replaced.

The state of this oil greatly affects the wear of sliding parts. For example, if the properties of the oil change suddenly or if the oil is used continuously without being replaced for a long period of time, the physical properties of the oil, for example, the viscosity, are appropriate. The value may deviate from the above value, and the amount of wear of sliding parts may increase due to deterioration of the lubrication state, which may eventually lead to damage to the machine.

Patent Document 1 looks at a change in the first parameter (for example, blow-by pressure) that reflects the wear state of the component or a second parameter (for example, engine fuel consumption) that reflects the cumulative load of the component. (Blow-by pressure, engine fuel consumption, etc.) is an indirect parameter that affects the wear and deterioration of parts, and the actual wear amount and life cannot be predicted accurately, so it is possible to accurately determine the maintenance time. Was difficult.

An object of the present invention is to provide a work machine provided with a plurality of parts to which oil is supplied, which can grasp the deterioration state of oil and accurately estimate the replacement time of the parts.

In order to achieve the above object, the present invention comprises a plurality of parts to which oil is supplied, and measures at least one oil property of the oil viscosity, density, dielectric constant, and color difference and an oil property of measuring the temperature of the oil. In a work machine provided with a sensor and a control device that estimates the replacement time of at least one of the plurality of parts and the oil, the control device is based on the oil property value and the oil temperature measured by the oil property sensor. Then, the amount of change in the oil property value at the time of the measurement is calculated with respect to the oil property value when the oil is new oil at predetermined time intervals, and the amount of change in the oil property value is corrected based on the temperature of the oil. Then, the amount of oil deterioration based on the oil properties including the influence of the temperature of the oil is calculated, the amount of the oil deterioration at each predetermined time is integrated, and the integrated value of the oil deterioration amount based on the oil properties is calculated. When the integrated value of the oil deterioration amount exceeds the control standard value predetermined for each of the plurality of parts, it is presumed that the time for replacing the parts related to the control standard value has come.

According to the present invention, in a work machine provided with a plurality of parts to which oil is supplied, it is possible to grasp the deterioration state of the oil and accurately estimate the replacement time of the parts.

It is a figure which shows the appearance of a hydraulic excavator. It is a figure which shows the hydraulic drive circuit as one of the oil circulation circuits. It is a figure which shows the engine oil circuit as another one of the oil circulation circuits. It is a figure which shows the met work system which includes the control device of the hydraulic excavator which concerns on one Embodiment of this invention, and other control devices. It is a figure which shows the time-series viscosity change ((a) and (b)) of the engine oil of a different machine A and B, and the integral value ((c)) of the viscosity change amount of a machine A and a machine B. It is a figure which shows the time-series temperature change of the engine oil of a different machine C and machine D. It is a figure which shows the degree of deterioration of the temperature of an engine oil, and the viscosity thereof. It is a figure which shows the structure of the control device of a hydraulic excavator, and the processing content. It is a figure which shows the operation information which is stored in the storage device. It is a figure which shows the information which is stored in another storage device. It is a flowchart which shows the arithmetic processing content performed by the arithmetic processing unit in Example 1. FIG. It is a flowchart which shows the detail of the step S110 of FIG. 11A. It is a flowchart which shows the arithmetic processing content performed by the arithmetic processing unit in Example 2. FIG. It is a flowchart which shows the arithmetic processing content performed by the arithmetic processing unit in Example 3. FIG. It is a flowchart which shows the arithmetic processing content performed by the arithmetic processing unit in Example 4. FIG. It is a flowchart which shows the arithmetic processing content which the arithmetic processing apparatus in Example 5 performs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the working machine of the present invention will be described by taking a hydraulic excavator as an example. The present invention is not limited to hydraulic excavators, but is applicable to other work machines such as dump trucks, wheel loaders, bulldozers, forklifts, and cranes as long as they are work machines that use oil as a lubricant or power transmission medium. It is possible.

FIG. 1 is a diagram showing the appearance of a hydraulic excavator.

In FIG. 1, the hydraulic excavator 300, which is well known as a work machine, has a lower traveling body 301, an upper swinging body 302 mounted on the lower traveling body 301 so as to be swivelable, and an upper heading body 302. It has a front working machine 303 that can be attached.

The lower traveling body 301 travels by driving the left and right crests 313 and 314 by the rotation of the left and right traveling motors (hydraulic motors) 310 and 311. The upper swivel body 302 can be swiveled with respect to the lower traveling body 301 by the rotation of the swivel motor (hydraulic motor) 317 provided in the swivel device 316.

The upper swivel body 302 includes a cabin 318 forming a driver's cab, and a driver's seat 330 on which the operator sits, an operating device 331 operated by the operator, and the like are arranged in the cabin 318. Further, the engine 320 and a plurality of oil circulation circuits described later are arranged on the upper swing body 302.

The front working machine 303 is composed of a boom 306, an arm 307, and a bucket 308. The boom 306, arm 307, and bucket 308 can rotate in the vertical direction by expanding and contracting the boom cylinder (hydraulic cylinder) 321, the arm cylinder (hydraulic cylinder) 322, and the bucket cylinder (hydraulic cylinder) 323, respectively.

The operation device 331 includes a travel operation device, a rotation operation device, and a boom operation device that instruct the operation of the traveling motors 310, 311, the swivel motor 317, the boom cylinder 321 and the arm cylinder 322, and the bucket cylinder 323, respectively. Includes an operating device for the arm and an operating device for the bucket.

When excavating with the hydraulic excavator 300, when the operator operates the operation device for the boom, the operation device for the arm, and the operation device for the bucket, the boom cylinder 321 and the arm cylinder 322 and the bucket cylinder 323 expand and contract, and the boom. The 306, the arm 307, and the bucket 308 are driven. When the operator operates the boom operating device and the turning operating device when loading the excavated soil into a dump truck or the like, the boom cylinder 321 expands, the boom 306 is driven in the upward direction, and the turning motor 317. Rotates, and the upper swivel body 302 swivels. When the hydraulic excavator 300 is run, when the operator operates the running operating device, the running motors 310 and 311 rotate and the tracks 313 and 314 are driven.

Further, the hydraulic excavator 300 includes a plurality of oil circulation circuits including a plurality of parts to which oil is supplied.

FIG. 2 is a diagram showing a hydraulic drive circuit (circuit of a hydraulic equipment system) 500 as one of such oil circulation circuits. The hydraulic oil used as a power transmission medium in a hydraulic drive circuit also has a role as a lubricant for lubricating the hydraulic equipment of the hydraulic drive circuit.

In FIG. 2, the hydraulic drive circuit 500 includes a hydraulic oil tank 502, a hydraulic pump 504, a control valve 506, a hydraulic cylinder 508, an oil cooler 510, and a hydraulic oil filter 512.

The hydraulic oil (oil) in the hydraulic oil tank 502 is pumped by the hydraulic pump 504 driven by the engine 320 and supplied to the hydraulic cylinder 508 (for example, the boom cylinder 321) via the control valve 506. The control valve 506 controls the flow direction and flow rate of the pressure oil supplied to the hydraulic cylinder 508 according to the switching position of the operating device (for example, the operating device for the boom). As a result, the hydraulic cylinder 508 is driven and, for example, the boom 306 operates. Further, the hydraulic oil flowing out of the hydraulic cylinder 508 is guided to the oil cooler 510 via the control valve 506 to be cooled, and then returned to the hydraulic oil tank 502 via the hydraulic oil filter 512. The oil cooler 510 is cooled by the air taken in by the cooling fan 514 driven by the engine 320.

In FIG. 2, the case where the hydraulic cylinder 508 is the boom cylinder 321 has been described, but the same applies to the case where the hydraulic cylinder 508 is another hydraulic actuator. That is, even when the hydraulic cylinder 508 is another hydraulic actuator, corresponding control valves are provided, and each hydraulic actuator is appropriately driven by the hydraulic oil controlled by each control valve.

FIG. 3 is a diagram showing an engine oil circuit (engine system circuit) 600 as another one of the oil circulation circuits. The engine oil is used as a lubricant inside the engine 320 and as a cooling agent for the engine 320.

In FIG. 3, the engine oil circuit 600 includes an oil pan 602, an engine oil pump 604, an oil cooler 606, a water jacket 608, an oil filter 610, a water pump 612, and a radiator 614.

The engine oil pump 604 is driven by the engine 320. The engine oil pump 604 sucks engine oil from the oil pan 602 and sends the engine oil to the oil cooler 606. In the oil cooler 606, the engine oil is cooled by heat exchange with the cooling water in the water jacket 608. The cooled engine oil is returned to the oil pan 602 after the foreign matter is removed by the oil filter 610.

The water pump 612 is also driven by the engine 320 to suck the cooling water in the water jacket 608 and supply it to the radiator 614. The cooling water cooled by the radiator 614 is returned to the water jacket 608. The radiator 614 is cooled by the air taken in by the cooling fan 514 driven by the engine 320.

Further, the hydraulic excavator 300 of the present embodiment has, as its characteristic configuration, oil property sensors 120, 122 (FIG. 12) for measuring at least one oil property of oil viscosity, density, dielectric constant, and color difference and oil temperature. 2 and FIG. 3), and a maintenance time estimation system including a plurality of parts to which oil is supplied and a control device 110 (see FIG. 1) for estimating the oil replacement time.

In the present embodiment, the hydraulic excavator 300 has an oil property sensor 120 (see FIG. 2) for detecting the properties of hydraulic oil and an oil property sensor 122 (see FIG. 3) for detecting the properties of engine oil as oil property sensors. And have.

As shown in FIG. 2, the oil property sensor 120 is provided in an oil passage connecting the control valve 506 and the hydraulic chamber on the head side of the hydraulic cylinder 508, and the properties of the hydraulic oil passing through the oil passage (for example,). Detects temperature, viscosity, density, dielectric constant).

As shown in FIG. 3, the oil property sensor 122 is provided in an oil passage that connects the oil cooler 606 and the oil filter 610 and returns the engine oil to the oil pan 602, and the properties of the engine oil passing through this oil passage. (For example, temperature, viscosity, density, dielectric constant) is detected.

In the present embodiment, the oil property sensors 120 and 122 will describe the case where the oil property sensors 120 and 122 detect the four properties of the hydraulic oil and the engine oil, respectively, of temperature, viscosity, density and dielectric constant. In addition to temperature, the system may be configured to detect at least one of viscosity, density and permittivity. Further, the oil property sensors 120 and 122 may be further configured to detect the color difference of the oil. Further, the oil property sensors 120 and 122 may be configured so that the temperature, viscosity, density, dielectric constant, and color difference are appropriately shared and detected by a plurality of oil property sensors, or a plurality of oil property sensors having the same properties having different properties may be configured. The system may be configured to detect at a location.

FIG. 4 is a diagram showing a metwork system including a control device 110 of a hydraulic excavator 300 and another control device according to an embodiment of the present invention.

The network system shown in FIG. 4 is a control used by the control device 110 of the hydraulic excavator 300, the manufacturer control device (server) 112 under the control of the manufacturer of the hydraulic excavator 300, and the administrator (user) of the hydraulic excavator 300. The control device (service) used by the device (control device for manager) 114 and the service person (service man) who belongs to the work machine maker or its sales office or agency and performs repair and maintenance of the hydraulic excavator 300. Control device) 116.

The management information (described later) used by the control device 110 of the hydraulic excavator 300 is transmitted from the manufacturer control device 112 and is appropriately updated. The control device 110 of the hydraulic excavator 300 adds maintenance information necessary for maintenance such as the replacement target name, the machine number of the hydraulic excavator 300, and the position information of the hydraulic excavator 300 to the estimated replacement time information of the parts or oil. It is transmitted to the control device 112. The manufacturer control device 112 adds information necessary for replacing parts or oil to the maintenance information, and transmits the information to the administrator control device 114 and the service control device 116. Further, the service control device 116 transmits service information for changing parts or oil to the manager control device 114. As a result, it is possible to promptly replace the parts or oil based on the information on the replacement timing of the parts or oil estimated by the control device 110 of the hydraulic excavator 300.

Next, the concept of the present invention will be described.

FIGS. 5A and 5B are diagrams showing time-series viscosity changes of engine oils of different machines A and B. Machine A has a long oil change interval, so that the viscosity change is large, and Machine B has a short oil change interval, so that the viscosity change is small. Here, the amount of change in viscosity (from the oil property value when the oil is new oil) from the reference (new oil value) with respect to a predetermined time ΔT (for example, 30 to 60 seconds) based on the viscosity of the new oil. Assuming that the amount of change) is ΔA, the integrated value of the amount of change in viscosity (the integrated value of the amount of change in oil properties) can be calculated by the following equation (1).

ΣΔAn × ΔTn ・ ・ ・ (1)
FIG. 5 (c) shows the integrated value (cumulative value) of the viscosity change amount of the machine A and the machine B calculated by the above formula (1), and the integrated value of the viscosity change amount is the wear amount of the machine part. It is known to have a good correlation. When the integrated value of the viscosity change amount exceeds a predetermined control reference value (threshold value), it is estimated that the time for parts replacement or overhaul has come, and the parts replacement or overhaul is notified.

Although the explanation has been given here using viscosity as an example, it can be similarly applied to oil density, dielectric constant, color difference, etc., and the risk of wear amount can be suppressed by making a judgment by combining them.

FIG. 6 is a diagram showing time-series temperature changes of engine oils of different machines C and D. Machine C is a case where the load is increased only for a short time, and machine D is a case where the load is continuously increased.

FIG. 7 is a diagram showing the degree of deterioration of the temperature of the engine oil and its viscosity. Oil is known to be rapidly damaged by increasing temperature. Using this degree of deterioration as the coefficient Kd, a predetermined calculation process is performed with the amount of change in the oil property value (for example, the amount of change in viscosity) ΔAn from the above-mentioned new oil value and the coefficient Kd to correct the temperature of ΔAn. Integral processing is performed on the amount of change in the oil property value corrected for temperature, and the integrated value is calculated. That is, assuming that the amount of change in the temperature-corrected oil property value is ΔACn, the integrated value of the amount of change in the temperature-corrected oil property value is calculated by the following equation (2).

ΣΔACn × ΔTn ・ ・ ・ (2)
The total amount of heat of oil is different between the machine C and the machine D in FIG. 6 (total heat of machine C <total heat of machine D). The deterioration of oil has a close correlation with the total amount of heat applied, and by knowing the deterioration state of oil including the influence of the temperature of the oil (total amount of heat applied), the deterioration state (lubrication state) of the oil and the parts It is possible to grasp the degree of damage more accurately. For example, a machine such as machine D in which the temperature of oil continues to be high deteriorates severely, and parts must be replaced frequently (at short intervals), but the operating time is long like machine C. If it is long, but the high temperature of the oil is short, the condition of the oil seems to be relatively healthy, and it is considered that parts can be replaced infrequently (at long intervals). Further, it is considered that the oil itself must be changed frequently (at short intervals) in the case of Machine D, but can be changed infrequently (at long intervals) in the case of Machine C.

Although the above-mentioned study results mention engine oil, hydraulic oil also has the same properties as oil, and the study results can be applied to hydraulic oil as well.

In addition, although the above-mentioned examination results mention the viscosity of oil, it is also applicable to the density, dielectric constant, and color difference of oil.

The present invention is based on the above findings. The details will be described below.

FIG. 8 is a diagram showing the configuration and processing contents of the control device 110 of the hydraulic excavator 300.

The control device 110 includes an arithmetic processing unit (for example, a CPU) 200 as an arithmetic means for executing various programs, and a storage device (for example, ROM, RAM) as a storage means for storing various data including the program. It also includes a semiconductor memory such as a flash memory, a magnetic storage device such as a hard disk drive) 202, 204, and an input / output arithmetic processing unit 206 that controls data input / output to the arithmetic processing unit 200 and the storage devices 202, 204. ing. Further, the control device 110 includes a monitor (for example, a liquid crystal monitor) 208 for displaying the processing result of the arithmetic processing unit 200, and an input device (for example, a numeric keypad, a keyboard, a touch panel) (not shown) for inputting information from the operator. Etc.).

The storage device 202 stores operation information such as sensor information 102 based on the sensor value of the oil property sensor 120 and sensor information 104 based on the sensor value of the oil property sensor 122. The storage device 204 stores management information 106 such as a control reference value and a temperature deterioration degree function transmitted from the manufacturer's control device 112.

FIG. 9 is a diagram showing operation information stored in the storage device 202.

The oil property sensor 120 can measure five oil properties such as temperature, viscosity, density, dielectric constant, and color difference. As shown in FIG. 8, for example, the sensor information of the viscosity among the sensor information 102 by the sensor 120 at a certain time is appropriately processed by the input / output calculation processing device 206, and is associated with the measurement time in the storage device 202 as the sensor information A1. Is remembered. The sensor information A1, A2, A3, A4 ... In FIG. 8 indicates the sensor information of the viscosity measured by the sensor 120 at different times, and the number at the end increases with the passage of time. As a result, the time-series data of the sensor information A of the viscosity by the sensor 120 is stored in the storage device 202. Similarly, the sensor information B in the figure indicates the sensor information of the density by the sensor 120. Although description is omitted, the permittivity, color difference, and temperature of other properties detected by the sensor 120 are also stored in the storage device 202 as sensor information C, D, and E.

Of the sensor information 104 by the oil property sensor 122, the viscosity sensor information and the density sensor information are also appropriately processed by the input / output calculation processing device 206, and the sensor information F1, F2, F3, F4 ..., G1, for each time interval ΔT. It is stored in the storage device 202 as G2, G3, G4 ... In association with the measurement time. Similarly, the sensor information of the permittivity, the temperature, and the color difference is stored in the storage device 202 as the sensor information H, I, J in association with the measurement time.

FIG. 10 is a diagram showing information stored in the storage device 204.

As described above, the management information 106 used by the control device 110 of the hydraulic excavator 300 is transmitted from the manufacturer control device 112. This management information 106 is stored in the storage device 204. In the present embodiment, the management information 106 stored in the storage device 204 includes the following control reference value and the temperature deterioration degree function.

Control standard value Oil deterioration threshold (threshold for parts replacement; for each part)
Oil deterioration threshold (threshold for oil change)
Metal part threshold (low temperature side threshold)
Polymer component threshold (high temperature side threshold)
Front operation threshold Non-front operation threshold Driving load threshold Driving motor operation threshold Attachment operation threshold Temperature deterioration function (for each oil property)
Returning to FIG. 8, the arithmetic processing unit 200 has an oil deterioration amount integral value calculation unit 210 and a component / oil change timing determination unit 212.

The oil deterioration amount integrated value calculation unit 210 calculates the oil deterioration amount integrated value by the above formula (2) based on the oil property value detected by the oil property sensor 120 or 122, and the parts / oil replacement time determination unit 212 calculates the oil deterioration amount integrated value. , Estimate the replacement time of parts or oil based on the integrated value of the oil deterioration amount. That is, the oil deterioration amount integral value calculation unit 210 and the parts / oil change timing determination unit 212 perform the following processing.

(1) The oil deterioration amount integrated value calculation unit 210 measures the oil property value when the oil is new oil at predetermined time intervals based on the oil property value measured by the oil property sensors 120 and 122 and the oil temperature. The amount of change in the oil property value at time is calculated, the amount of change in the oil property value is corrected based on the oil temperature, the amount of oil deterioration based on the oil property including the influence of the oil temperature is calculated, and the predetermined time The integrated value of the oil deterioration amount based on the oil properties is calculated by integrating the oil deterioration amount for each, and the component / oil replacement time determination unit 212 manages the integrated value of the oil deterioration amount for each of a plurality of parts. When the standard value is exceeded, it is estimated that it is time to replace the parts related to the control standard value.

This makes it possible to grasp the deterioration state of the oil and accurately estimate the replacement time of the parts.

(2) Further, preferably, in the above (1), when the component / oil change time determination unit 212 exceeds the control standard value predetermined for the oil, the oil change time is set. I presume that it came.

This makes it possible to grasp the deterioration state of the oil and accurately estimate the oil replacement time.

(3) Further, preferably, in the above (1), the oil deterioration amount integrated value calculation unit 210 stores the relationship between the oil temperature and the degree of deterioration of the oil properties, and uses the relationship to store the oil at that time. By calculating the degree of deterioration of the oil property corresponding to the measured value of the temperature of, and performing a predetermined calculation with the amount of change in the oil property value and the degree of deterioration of the oil property, the amount of change in the oil property value becomes the temperature of the oil. The amount of oil deterioration based on the oil properties including the influence of the oil temperature is calculated based on the correction.

(4) Further, more preferably, in the above (1), the oil deterioration amount integrated value calculation unit 210 calculates the respective changes in the viscosity, density, and dielectric constant of the oil as the change in the oil property value, and the oil. The temperature is corrected for each change in viscosity, density, and dielectric constant of the oil, and the first oil deterioration amount based on the viscosity of the oil, the second oil deterioration amount based on the density of the oil, and the second oil deterioration amount based on the dielectric constant of the oil. 3 Calculate the oil deterioration amount, and integrate the first oil deterioration amount based on the viscosity of the oil, the second oil deterioration amount based on the oil density, and the third oil deterioration amount based on the dielectric constant of the oil at predetermined time intervals. The first oil deterioration amount integrated value, the second oil deterioration amount integrated value, and the third oil deterioration amount integrated value based on the viscosity of the oil are calculated, and the component / oil replacement time determination unit 212 is determined for each of a plurality of parts. As the control standard value, the control standard value of the property value that most affects the damage of the part among the viscosity, density, and dielectric constant of the oil is stored for each of the plurality of parts, and the viscosity of the oil is stored for each of the plurality of parts. Of the integrated value of the first oil deterioration amount of the base, the second oil deterioration amount integrated value of the oil density base, and the third oil deterioration amount integrated value of the oil viscosity base, the oil deterioration corresponding to the control standard value to which it is concerned. When the quantitative integral value exceeds the control standard value, it is estimated that it is time to replace the part.

(5) More preferably, in the above (4), the component / oil replacement time determination unit 212 stores the control reference value for each oil viscosity, density, and dielectric constant, and the oil viscosity-based first oil. When any of the deterioration amount integrated value, the oil density-based second oil deterioration amount integrated value, and the oil dielectric constant -based third oil deterioration amount integrated value exceeds the control standard value earliest, it is time to replace the oil. Is presumed to have come.

The details of the processing contents of the arithmetic processing unit 200 (oil deterioration amount integral value calculation unit 210 and parts / oil change timing determination unit 212) will be described below with reference to a flowchart.

<Example 1>
11A and 11B are flowcharts showing the contents of arithmetic processing performed by the arithmetic processing unit 200 in the first embodiment. The first embodiment is for the case where the oil is engine oil, but the same can be applied when the oil is hydraulic oil.

In FIG. 11A, the arithmetic processing device 200 extracts sensor information of viscosity, density, dielectric constant, and temperature for each time interval ΔT from the sensor information 104 detected by the oil property sensor 122 and stored in the storage device 202 (. Step S100). Next, the arithmetic processing apparatus 200 performs an integration process of calculating the integrated value of the oil deterioration amount to which the temperature correction is added by using the sensor information of the viscosity, density, dielectric constant and temperature of the engine oil (step S110).

FIG. 11B is a flowchart showing the details of step S110.

The arithmetic processing device 200 is based on the oil property value measured by the oil property sensor 122 and the temperature of the oil, and the amount of change in the oil property value at that time with respect to the oil property value when the oil is new oil at each time interval ΔT. Is calculated (step S112). At this time, the amount of change in the viscosity, density, and dielectric constant of the oil is calculated as the amount of change in the oil property value.

Next, the arithmetic processing unit 200 corrects the amount of change in the oil property value based on the oil temperature, and calculates the oil deterioration amount ACn based on the oil property including the influence of the oil temperature (step S114). Further, the control device 110 stores the relationship between the oil temperature and the degree of deterioration of the oil properties as shown in FIG. 7 in the storage device 204, and the arithmetic processing device 200 uses the relationship to store the oil at that time. By calculating the degree of deterioration of the oil property corresponding to the temperature and performing a predetermined calculation with the amount of change in the oil property value and the degree of deterioration of the oil property, the amount of change in the oil property value is corrected based on the temperature of the oil. , Calculate the oil deterioration amount ACn based on the oil properties including the influence of the oil temperature.

An example of the above predetermined operation will be described.

The degree of deterioration of the oil properties shown in FIG. 7 is a coefficient Kd as described above. The corresponding coefficient Kd is calculated by referring to the measured value of the oil temperature for the relationship between the oil temperature and the degree of deterioration of the oil properties. This coefficient is multiplied by the change amount of the oil property value calculated in step S112, the value is added to the change amount, and the oil deterioration amount ACn based on the oil property including the influence of the oil temperature is calculated.

Further, the amount of oil deterioration based on the oil properties is calculated for each change amount of the viscosity, density, and dielectric constant of the oil. That is, the temperature is corrected for each change in oil viscosity, density, and dielectric constant, and the oil viscosity-based first oil deterioration amount AC1n, the oil density-based second oil deterioration amount AC2n, and the oil Calculate the third oil deterioration amount AC3n based on the dielectric constant .

Next, the arithmetic processing unit 200 integrates the oil deterioration amount ACn for each time interval ΔT by the above equation (2) to calculate the integrated value of the oil deterioration amount (step S116). The integral value of the oil deterioration amount is calculated for each oil deterioration amount ACn of the viscosity, density, and dielectric constant of the oil. That is, the first oil deterioration amount AC1n, the second oil deterioration amount AC2n, and the third oil deterioration amount AC3n are integrated for each time interval ΔT, and the first oil deterioration amount integrated value based on the oil viscosity and the oil density base are integrated. The second oil deterioration amount integrated value and the third oil deterioration amount integrated value based on the dielectric constant of the oil are calculated.

Returning to FIG. 11A, the arithmetic processing apparatus 200 then determines whether or not the integrated value of the oil deterioration amount exceeds the control reference value predetermined for each of the plurality of parts, or the control reference value (oil deterioration) predetermined for the oil. It is determined whether or not the amount threshold)) has been exceeded (steps S120 and S140), and when the integrated value of the oil deterioration amount exceeds each control standard value, it is time to replace the parts or oil related to the control standard value. Is estimated to have arrived, and a message to that effect is displayed on the monitor 208 to notify the operator (steps S130 and S140).

Further, the control device 110 sets the storage device 204 as a control reference value set for each of the plurality of parts, and is a property value that most affects the damage of the parts among the viscosity, density, and dielectric constant of the oil for each of the plurality of parts. The arithmetic processing apparatus 200 stores the control reference value of the above, and the arithmetic processing apparatus 200 uses the control reference value to obtain the first oil deterioration amount integrated value based on the viscosity of the oil and the second oil based on the density of the oil for each of a plurality of parts. Of the deterioration amount integrated value and the third oil deterioration amount integrated value based on the viscosity of the oil, it is determined whether or not the oil deterioration amount integrated value corresponding to the control reference value related to itself exceeds the control reference value (step S120). ), When the oil deterioration integrated value exceeds the control reference value, it is estimated that it is time to replace the component (step S130).

Further, the control device 110 stores the control reference value for each oil viscosity, density, and dielectric constant as the control reference value defined for the oil in the storage device 204, and the arithmetic processing device 200 stores the control reference value. The first oil deterioration integrated value based on the oil viscosity, the second oil deterioration integrated value based on the oil density, and the third oil deterioration integrated value based on the dielectric constant of the oil are the respective control reference values. It is determined whether or not the oil has been exceeded (step S140), and when any of the first oil deterioration integrated value, the second oil deterioration integrated value, and the third oil deterioration integrated value exceeds the control reference value earliest, the oil is used. It is estimated that it is time to replace the oil (step S150).

The degree of deterioration of the engine oil shown in FIG. 7 is added to the oil property values measured in this way, the integrated value of the oil deterioration amount is calculated by the equation (2), and the engine oil at that time is compared with the control reference value. Based on the deterioration state (lubricating state) of, it is possible to accurately grasp the degree of damage to the peripheral parts to which the engine oil is supplied, thereby accurately estimating the replacement time of the engine oil and peripheral parts and issuing a maintenance warning. You can be notified.

In addition, various parts are used as peripheral parts, and the control standard values for these parts are different due to the deterioration of engine oil. Therefore, by setting a control standard value for each part, it is possible to issue a maintenance warning for each part. For example, an alloy sliding bearing that is sufficiently lubricated by the engine oil in the engine and a piston ring that is mounted on the upper part of the piston that is exposed to high temperature and high pressure and is severely lubricated by the engine oil, are the engine oil. The degree of influence due to deterioration of the engine is different. In that case, by calculating the integral value of the formula (2) for each part and setting the control reference value for each part, the replacement time of the part is estimated separately for each part, and the maintenance warning is also notified separately. Is possible.

In addition, engine oil is composed of various polymer compounds including base oil and additives. Deterioration of base oil affects viscosity, and deterioration of additives affects dielectric constant and density. Therefore, by calculating the deterioration amount integrated value separately for the viscosity, the dielectric constant, and the density and determining the engine oil replacement time for each, the engine oil replacement time can be grasped more accurately.

In addition, which component of engine oil affects the sliding characteristics of the component differs depending on the component. For example, the bearing portion has a viscosity (when the viscosity becomes low, the oil film formation becomes insufficient and the bearing portion burns). In addition, the piston ring and cylinder bore of the engine have a dielectric constant (because the dielectric constant of the engine oil affects water and soot), and the plunger and cylinder bore have viscosity and density (sliding characteristics depending on the state of the oil film and the state of the additive). Because it changes). Therefore, the integrated deterioration amount is calculated by dividing the viscosity, the dielectric constant, and the density, and the control standard value of the property value that most affects the damage of the component among the viscosity, the density, and the dielectric constant is used for each component. By determining the replacement time of the parts, it is possible to accurately grasp the deterioration state of the oil for each part and estimate the replacement time of the parts more accurately.

<Example 2>
FIG. 12 is a flowchart showing the contents of arithmetic processing performed by the arithmetic processing unit 200 in the second embodiment. The second embodiment is for the case where the oil is a hydraulic oil, but the same can be applied when the oil is an engine oil.

In FIG. 12, the processing content of steps S100, S110, S140, and S150 is the same as that of Example 1 shown in FIGS. 11A and 11B, except that the oil is hydraulic oil.

The control device 110 sets a low temperature side threshold value and a high temperature side threshold value in the temperature change range of the oil, and stores the low temperature side threshold value and the high temperature side threshold value in the storage device 204.

In step S110, the arithmetic processing apparatus 200 calculates the integrated value of the oil deterioration amount to which the temperature correction is added by using the viscosity, density, dielectric constant and temperature of the hydraulic oil measured by the oil property sensor 120, and then the oil property sensor. It is determined whether the oil temperature measured in 120 exceeds the low temperature side threshold value (metal component threshold value) (step S200), and when the oil temperature exceeds the low temperature side threshold value, the oil For the oil property value whose temperature exceeds the low temperature side threshold value, the oil deterioration amount integrated value (the first oil deterioration amount integrated value based on the oil viscosity, is used again by the same processing procedure as in step S110 shown in FIG. 11B. The second oil deterioration amount integrated value based on the oil density and the third oil deterioration amount integrated value based on the oil dielectric constant ) are calculated (step S210).

Next, the arithmetic processing apparatus 200 determines whether or not the oil temperature measured by the oil property sensor 120 exceeds the high temperature side threshold value (polymer component threshold value) (step S220), and the oil temperature is high. When the side threshold is exceeded, the oil deterioration amount integrated value (oil) is further subjected to the same treatment procedure as in step S110 shown in FIG. 11B for the oil property value in which the oil temperature exceeds the high temperature side threshold. The viscosity-based first oil deterioration amount integrated value, the oil density-based second oil deterioration amount integrated value, and the oil dielectric constant -based third oil deterioration amount integrated value) are calculated (step S230).

Here, the low temperature side threshold value is an arbitrary temperature (preferably 30 ° C.) in the range of, for example, 28 to 35 ° C., which is equal to or lower than the hydraulic oil temperature during normal working operation of the hydraulic excavator 300. The high temperature side threshold value is an arbitrary temperature (preferably 80 ° C.) in the range of, for example, 75 to 85 ° C., which is the heat resistant temperature of the rubber. In the case of engine oil, the low temperature side threshold value is an arbitrary temperature (preferably 30 ° C.) within the range of, for example, 28 to 35 ° C., which is the same as in the case of hydraulic oil, and the high temperature side threshold value is the packing. It is an arbitrary temperature (preferably 100 ° C.) in the range of, for example, 95 to 105 ° C., which is a heat resistant temperature.

Next, the arithmetic processing unit 200 estimates the replacement time of the polymer component containing the polymer compound (for example, synthetic resin) on the sliding surface among the plurality of components based on the oil deterioration amount integrated value calculated in step S230. Steps S240, S250).

At this time, the control device 110 stores, as the control reference value of the polymer component, the control reference value of the property value that most affects the damage of the component among the viscosity, density, and dielectric constant of the oil for each of the plurality of components. The arithmetic processing device 200 uses the management reference value thereof, and is involved in the first oil deterioration amount integrated value, the second oil deterioration amount integrated value, and the third oil deterioration amount integrated value for each of a plurality of parts. It is determined whether or not the oil deterioration amount integrated value corresponding to the control standard value exceeds the control standard value (step S240), and when the oil deterioration amount integrated value exceeds the control standard value, it is time to replace the polymer component. Is presumed to have arrived (step S250).

Next, the arithmetic processing unit 200 estimates the replacement time of the metal component containing metal on the sliding surface among the plurality of components based on the oil deterioration amount integrated value calculated in step S210 (steps S260 and S270).

At this time, the control device 110 sets the storage device 204 as a control reference value of the property value of the oil viscosity, density, and dielectric constant, which most affects the damage of the component, for each of the plurality of components as the control reference value of the metal component. The arithmetic processing device 200 uses the management reference value of the first oil deterioration amount integrated value, the second oil deterioration amount integrated value, and the third oil deterioration amount integrated value for each of the plurality of parts. , Determine whether the oil deterioration integrated value corresponding to the control standard value related to itself exceeds the control standard value (step S260), and when the oil deterioration integrated value exceeds the control standard value, the metal part It is estimated that it is time to replace the oil (step S270).

As described above, in the second embodiment, the low temperature side threshold value and the high temperature side threshold value are set, and when the measured value exceeds these threshold values, the oil deterioration amount integrated value is calculated separately. In addition, for oil property values that exceed the low temperature side threshold value, the replacement timing of all sliding parts including metal parts is monitored, and for oil property values that exceed the high temperature side threshold value, polymer parts Monitor the replacement time.

This excludes the measured value of the oil property value in a state where the hydraulic oil does not deteriorate and the parts do not deteriorate at low temperature, that is, when the work machine hardly operates or the engine is idling. be able to. For this reason, if a work machine with many standby operations is judged based on a value that does not use the low temperature threshold value, it may be determined that it is time to replace the part even if the part is sound. It is possible to prevent such an erroneous determination.

Further, the determination using the high temperature side threshold value mainly targets parts using a polymer, for example, a rubber oil seal or a resin sliding material. This is because the deterioration rate of polymer compounds changes rapidly with respect to temperature and environment, for example, above the glass transition temperature, so by setting a threshold value different from that of metal products, it is possible to more accurately with respect to polymer parts. This is because it is necessary to issue a maintenance warning. In addition, since polymer compounds are often used as a sealing material for hydraulic oil, it is possible to prompt the replacement of polymer parts and prevent the hydraulic oil from leaking to the outside by issuing a maintenance warning early. Become.

<Example 3>
FIG. 13 is a flowchart showing the contents of arithmetic processing performed by the arithmetic processing unit 200 in the third embodiment. The third embodiment is for the case where the oil is hydraulic oil.

In the hydraulic excavator 300 of the third embodiment, the operation device (operation device for boom, operation device for arm, operation device for bucket) of the front working machine 303 among the operation devices 331 (see FIG. 1) was operated. The front operation sensor 251 (see FIG. 8) for detecting the above is further provided. The front operation sensor 251 is a pressure sensor that detects, for example, a front operation signal (operation pilot pressure) generated by operating a boom operation device, an arm operation device, and a bucket operation device.

In FIG. 13, the processing contents of steps S100, S140, and S150 are the same as those of the first embodiment shown in FIGS. 11A and 11B, except that the oil is hydraulic oil.

In step S100, the arithmetic processing apparatus 200 extracts sensor information of viscosity, density, dielectric constant and temperature for each time interval ΔT from the sensor information 104 detected by the oil property sensor 122 and stored in the storage apparatus 202. , It is determined whether or not the front operation signal is input from the front operation sensor 251 (step S300), and when the front operation signal is input, the sensor information of the viscosity, density, dielectric constant and temperature of the hydraulic oil at the time of front operation. In the same processing procedure as in step S110 shown in FIG. 11B, the integrated value of the oil deterioration amount during front operation (the first oil deterioration amount integrated value based on the oil viscosity and the second oil deterioration amount based on the oil density). The integrated value and the third oil deterioration amount integrated value based on the dielectric constant of the oil) are calculated (step S310).

Next, in the front operation, the arithmetic processing apparatus 200 has an oil viscosity-based first oil deterioration integrated value, an oil density-based second oil deterioration integrated value, and an oil dielectric constant -based for each of the plurality of parts. Of the third oil deterioration amount integral value of the above, it is determined whether or not the oil deterioration amount integral value corresponding to the control reference value (front operation threshold value) related to itself exceeds the control reference value (step S330), and the oil is used. When the deterioration integral value exceeds the control reference value, it is estimated that it is time to replace the parts of the front working machine 303, and the necessity of checking or replacing the parts is displayed on the monitor 208 to notify the operator (step S340). ).

On the other hand, when the front operation signal is not input in step S300, the arithmetic processing apparatus 200 uses the sensor information of the viscosity, density, dielectric constant and temperature of the hydraulic oil when the front is not operating, and the step S110 shown in FIG. 11B. In the same processing procedure, the oil deterioration integrated value (oil viscosity-based first oil deterioration integrated value, oil density-based second oil deterioration integrated value, and oil dielectric constant -based second) when the front is not operating. 3 Oil deterioration amount integrated value) is calculated (step S320).

Next, when the front is not operating, the arithmetic processing apparatus 200 has an oil viscosity-based first oil deterioration integrated value, an oil density-based second oil deterioration integrated value, and an oil dielectric constant for each of the plurality of parts. Among the third oil deterioration amount integral values of the base, it is determined whether or not the oil deterioration amount integral value corresponding to the control reference value (non-front part operation threshold value) related to itself exceeds the control reference value (step S350). ), When the oil deterioration integral value exceeds the control standard value, it is estimated that it is time to replace parts other than the front work equipment 303 (mainly traveling system parts), and the necessity of checking or replacing parts is monitored. It is displayed on 208 and notified to the operator (step S360).

In step S330, when the oil deterioration amount integrated value during front operation does not exceed the control reference value, and in step S350, when the oil deterioration amount integrated value during front non-operation does not exceed the control reference value, step S340, When the processing of S360 is completed, the processing proceeds to steps S140 and S150, and as in the first embodiment, it is determined whether or not the oil exceeds the predetermined control reference value, and the integrated value of the oil deterioration amount is managed respectively. When the reference value is exceeded, it is estimated that it is time to replace the parts or oil related to the control reference value, and the monitor 208 is displayed to that effect to notify the operator.

In this way, by separately calculating the integral value of the deterioration amount of the hydraulic oil during front operation and the integral value of the deterioration amount of the hydraulic oil during running, for example, the deterioration state of the oil for each part is performed in more detail. It becomes possible to distinguish.

For example, by comparing the integrated value of the deterioration amount of the hydraulic oil during front operation and the integrated value of the deterioration amount of the hydraulic oil during running when the front is not operating, it is possible to compare the deterioration of the hydraulic oil during each operation. It is possible to estimate the deteriorated part. Furthermore, by combining the low temperature side threshold value and the arithmetic processing using the high temperature side threshold value used in Example 2, more detailed deterioration parts can be specified, and appropriate maintenance is performed at the required timing. be able to.

<Example 4>
FIG. 14 is a flowchart showing the contents of arithmetic processing performed by the arithmetic processing unit 200 in the first embodiment. Example 4 is also the case where the oil is hydraulic oil.

The hydraulic excavator 300 of the fourth embodiment has a traveling operation sensor 253 (see FIG. 8) for detecting that the traveling operating device has been operated among the operating devices 331 (see FIG. 1), and traveling motors 310 and 311 (see FIG. 1). It is further equipped with a pressure sensor 255 (see FIG. 8) that detects a load pressure (driving pressure during active driving, back pressure during inertial driving) of (see 1). The travel operation sensor 253 is, for example, a pressure sensor that detects a travel operation signal (operation pilot pressure) generated by operating a travel operation device.

In FIG. 14, the processing contents of steps S100, S110, S140, and S150 are the same as those of the first embodiment shown in FIGS. 11A and 11B, except that the oil is hydraulic oil.

The control device 110 sets a travel overload threshold value for determining whether or not the travel motors 310 and 311 are in an overload state, and stores the travel overload threshold value in the storage device 204. Further, the control device 110 sets a management reference value in the traveling state of the hydraulic excavator 300, and stores the management reference value in the storage device 204.

In step S110, the arithmetic processing apparatus 200 calculates an oil deterioration amount integrated value with temperature correction using the viscosity, density, dielectric constant and temperature of the hydraulic oil measured by the oil property sensor 120, and then the traveling operation sensor. A traveling operation signal is input from 253, and it is determined whether or not the hydraulic excavator 300 is in the traveling state (step S400). When the hydraulic excavator 300 is in the traveling state, the traveling motor 310 further detected by the pressure sensor 255. , 311 is determined whether or not the load pressure is equal to or higher than the traveling overload threshold value (step S410).

Next, when the arithmetic processing apparatus 200 determines in step S410 that the load pressure of the traveling motors 310 and 311 is equal to or higher than the traveling overload threshold value, the viscosity, density, and dielectric constant of the hydraulic oil in the traveling overload state are determined. And, using the sensor information of the temperature, in the same processing procedure as step S110 shown in FIG. 11B, the oil deterioration amount integrated value at the time of front operation (the first oil deterioration amount integrated value based on the viscosity of the oil, the oil density based The second oil deterioration amount integrated value and the third oil deterioration amount integrated value based on the viscosity of the oil) are calculated (step S420).

Next, the arithmetic processing apparatus 200 sets the integral value of the first oil deterioration amount based on the viscosity of the oil, the second integrated value of the deterioration amount of the oil based on the density of the oil, and the third oil deterioration based on the dielectric constant of the oil in the traveling overload state. It is determined whether or not the quantitative integral value exceeds the control reference value (travel motor operation threshold value) of the traveling state (step S430), and when the oil deterioration integral value exceeds the control reference value, the traveling motors 310 and 311 It is presumed that the replacement time has come, and the necessity of checking or replacing the traveling motor is displayed on the monitor 208 to notify the operator (step S440).

When the hydraulic excavator 300 travels downhill, the traveling motors 310 and 311 over-rotate due to the inertia of the vehicle body, and the load on the sliding portion and the hydraulic oil suddenly increases, resulting in an overload state. Overloading means that parts and hydraulic fluid are rapidly damaged and deteriorated. Therefore, by inputting the measured values of the traveling operation sensor 253 and the pressure sensor 255 and making a determination, the traveling state at the time of overload can be measured. Then, by estimating the deterioration state of the parts of the traveling motors 310 and 311 using the measured values, it is possible to grasp the appropriate maintenance time or replacement time of the traveling motors 310 and 311.

In addition, the process of steps S110 to S140 of FIG. 11A performed in Example 1 may be combined with Example 4, whereby in addition to the estimation of the replacement time of the traveling motors 310 and 311 as described above, the process of Example 1 may be combined. As described above, it is possible to estimate the replacement time of parts other than the traveling motor by using the oil property value measured by the oil property sensor 122 and the oil temperature.

Further, whether or not the hydraulic excavator 300 is in the traveling state is not limited to the traveling operation sensor 253, and may be the reception of position information by the speed sensor or GPS.

<Example 5>
FIG. 15 is a flowchart showing the contents of arithmetic processing performed by the arithmetic processing unit 200 in the fifth embodiment. Example 5 is also the case where the oil is hydraulic oil.

The hydraulic excavator 300 may perform work by attaching an attachment such as a crusher or a breaker to the front work machine 303 instead of the bucket 308.

The hydraulic excavator 300 of the fifth embodiment further includes an attachment mounting sensor 257 (see FIG. 8) for detecting that the attachment is mounted on the front working machine 303 instead of the bucket 308. The attachment mounting sensor 257 is, for example, a switch provided in the driver's seat in the cabin 318 (see FIG. 1). Further, it may be a pressure sensor provided in the hydraulic circuit of the attachment or a switch for detecting the insertion / removal of a pin necessary for replacing the attachment.

Further, the hydraulic excavator 300 of the fifth embodiment detects that the operating device (the operating device for the boom, the operating device for the arm, the operating device for the bucket) of the front working machine 303 has been operated, as in the third embodiment. The front operation sensor 251 (see FIG. 8) is further provided.

In FIG. 15, the processing contents of steps S100, S110, S140, and S150 are the same as those of the first embodiment shown in FIGS. 11A and 11B, except that the oil is hydraulic oil.

The control device 110 sets a management reference value of the usage state of the attachment, and stores the management reference value in the storage device 204.

In step S110, the arithmetic processing apparatus 200 calculates an oil deterioration amount integrated value with temperature correction using the viscosity, density, dielectric constant and temperature of the hydraulic oil measured by the oil property sensor 120, and then the front operation sensor. A front operation signal is input from 251 to determine whether or not the front working machine 303 is in the operating state (step S500), and when the front working machine 303 is in the operating state, the detection value of the attachment mounting sensor 257 is further set. Based on this, it is determined whether or not the attachment is attached to the front working machine 303 instead of the bucket 308 (step S510).

Next, when it is determined in step S510 that the attachment is attached, the arithmetic processing apparatus 200 uses the sensor information of the viscosity, density, dielectric constant and temperature of the hydraulic oil in the attachment attached state to show the step shown in FIG. 11B. In the same processing procedure as S110, the integrated value of oil deterioration amount during front operation (the first oil deterioration amount integrated value based on the viscosity of the oil, the second oil deterioration amount integrated value based on the oil density, and the dielectric constant -based value of the oil). The third oil deterioration amount integrated value) is calculated (step S520).

Next, the arithmetic processing apparatus 200, in the attached attachment state, has an integral value of the first oil deterioration amount based on the viscosity of the oil, an integral value of the second oil deterioration amount based on the density of the oil, and a third oil deterioration amount based on the dielectric constant of the oil. It is determined whether or not the integrated value exceeds the control standard value in the attached attachment state (step S530), and when the oil deterioration integrated value exceeds the control standard value, it is estimated that the attachment replacement time has come and the attachment is checked. Alternatively, the need for replacement is displayed on the monitor 208 to notify the operator (step S540).

In the fifth embodiment, a crusher or a breaker is mainly assumed as the attachment. The usage environment when a crusher or breaker is attached is extremely harsh, and there are many cases where dust or the like invades from the seal part of the hydraulic circuit of the attachment. When these dusts enter the hydraulic circuit of the attachment, the hydraulic oil deteriorates and the wear of parts is accelerated. Therefore, it is necessary to measure it separately from the deterioration of normal hydraulic oil.

Therefore, in the fifth embodiment, the integrated value of the oil deterioration amount is calculated in the attached attachment state and compared with the control reference value to appropriately determine the deteriorated state of the hydraulic oil when the attachment is attached, and the attachment, the hydraulic circuit, and the operation are performed. It is possible to grasp the appropriate replacement time for oil and perform maintenance.

In Example 5, the processes of steps S110 to S140 of FIG. 11A performed in Example 1 may be combined, whereby in addition to the estimation of the replacement time of the parts related to the attachment as described above, Example 1 As described above, it is possible to estimate the replacement time of parts other than the parts related to the attachment by using the oil property value measured by the oil property sensor 122 and the oil temperature.

102, 104 Sensor information 106 Management information 110 Control device 120 Oil property sensor (hydraulic oil)
122 Oil property sensor (engine oil)
200 Arithmetic processing unit (for example, CPU)
202, 204 Storage device 206 Input / output calculation processing device 208 Monitor 210 Oil deterioration amount integrated value calculation unit 212 Parts / oil replacement time determination unit 251 Front operation sensor 253 Travel operation sensor 255 Pressure sensor 257 Attachment mounting sensor 300 Hydraulic excavator 301 Lower travel Body 302 Upper swivel body 303 Front work machine 306 Boom 307 Arm 308 Bucket 310,311 Traveling motor (hydraulic motor)
317 Swing motor (hydraulic motor)
320 Engine 331 operating device (driving operation device, turning operation device, boom operation device, arm operation device, bucket operation device)
500 Hydraulic drive circuit 504 Hydraulic pump 508 Hydraulic cylinder 600 Engine oil circuit

Claims (10)

Equipped with multiple parts to which oil is supplied,
An oil property sensor that measures at least one oil property of the viscosity, density, dielectric constant, and color difference of the oil and the temperature of the oil.
In a work machine provided with the plurality of parts and a control device for estimating the replacement time of at least the plurality of parts of the oil.
The control device is
Based on the oil property value measured by the oil property sensor and the temperature of the oil, the amount of change in the oil property value at the time of the measurement is calculated at predetermined time intervals with respect to the oil property value when the oil is new oil.
The amount of change in the oil property value is corrected based on the temperature of the oil, and the amount of oil deterioration based on the oil property including the influence of the temperature of the oil is calculated.
The integrated value of the oil deterioration amount based on the oil properties is calculated by integrating the oil deterioration amount at each predetermined time.
A work machine characterized in that when the integral value of the oil deterioration amount exceeds a control standard value predetermined for each of the plurality of parts, it is estimated that it is time to replace the parts related to the control standard value. In the work machine according to claim 1,
The control device is
A work machine characterized in that it is estimated that the time for replacing the oil has come when the integrated value of the amount of deterioration of the oil exceeds a control reference value predetermined for the oil. In the work machine according to claim 1,
The control device is
Memorize the relationship between the temperature of the oil and the degree of deterioration of the oil properties.
Using the above relationship, the degree of deterioration of the oil properties corresponding to the measured value of the oil temperature at that time is calculated.
By performing a predetermined calculation based on the amount of change in the oil property value and the degree of deterioration of the oil property, the amount of change in the oil property value is corrected based on the temperature of the oil, and the influence of the temperature of the oil is affected. A work machine characterized in that the amount of oil deterioration based on the oil properties including the above is calculated. In the work machine according to claim 1,
The control device is
As the amount of change in the oil property value, the amount of change in the viscosity, density, and dielectric constant of the oil was calculated.
The temperature is corrected for each change in the viscosity, density, and dielectric constant of the oil, so that the first oil deterioration amount based on the viscosity of the oil, the second oil deterioration amount based on the density of the oil, and the oil Calculate the amount of deterioration of the third oil based on the dielectric constant of
The first oil deterioration amount, the second oil deterioration amount, and the third oil deterioration amount are integrated for each predetermined time to obtain the first oil deterioration amount integrated value based on the viscosity of the oil and the second oil density-based. Calculate the integrated oil deterioration amount and the third oil deterioration integrated value based on the dielectric constant of the oil.
As the control standard values set for each of the plurality of parts, the control standard values of the property values that most affect the damage of the parts among the viscosity, density, and dielectric constant of the oil are stored for each of the plurality of parts. ,
Of the viscosity-based first oil deterioration integrated value, the oil density-based second oil deterioration integrated value, and the oil dielectric constant -based third oil deterioration integrated value, for each of the plurality of components. A work machine characterized in that it is estimated that it is time to replace the parts when the integrated oil deterioration amount corresponding to the control standard value to which the user is involved exceeds the control standard value. In the work machine according to claim 4,
The control device is
Store the control reference values for each of the viscosity, density, and dielectric constant of the oil.
Either the viscosity-based first oil deterioration integrated value, the oil density-based second oil deterioration integrated value, or the oil dielectric constant -based third oil deterioration integrated value is the earliest. A work machine characterized in that it is estimated that it is time to change the oil when the amount exceeds. In the work machine according to claim 1,
The control device is
Set the low temperature side threshold value in the temperature change range of the oil,
When the temperature of the oil measured by the oil property sensor exceeds the low temperature side threshold value, the oil property becomes the oil property value with respect to the oil property value exceeding the low temperature side threshold value. A work machine characterized by calculating an oil deterioration amount integrated value based on the oil deterioration amount and estimating the replacement time of a part containing metal on a sliding surface among the plurality of parts based on the oil deterioration amount integrated value. In the work machine according to claim 6,
The control device is
A high temperature side threshold value is set in the temperature change range of the oil, and when the temperature of the oil measured by the oil property sensor exceeds the high temperature side threshold value, the temperature of the oil is set to the high temperature side. An oil deterioration amount integrated value based on the oil property is calculated for the oil property value exceeding the threshold value, and a polymer compound is contained in the sliding surface of the plurality of parts based on the oil deterioration amount integrated value. A work machine characterized by estimating the replacement time of parts. In the work machine according to claim 1,
Front work machine and
A hydraulic pump, a plurality of hydraulic cylinders driven by hydraulic oil discharged from the hydraulic pump to drive the front working machine, and a hydraulic drive device having a plurality of operating devices instructing the operation of the plurality of hydraulic cylinders. Further preparation,
The oil property sensor is an oil property sensor that measures the oil property of the hydraulic oil as the oil.
The control device is
Of the plurality of operating devices, the operating device of the front working machine is operated, it is determined whether or not the front working machine is operating, and when the front working machine is operating, oil based on the oil property is used. A work machine characterized in that a deterioration amount integrated value is calculated and the replacement time of parts related to a plurality of hydraulic cylinders of the front working machine is estimated based on the oil deterioration amount integrated value. In the work machine according to claim 1,
With the lower running body,
A hydraulic pump, a traveling motor driven by hydraulic oil discharged from the hydraulic pump to drive the lower traveling body, and a hydraulic driving device having an operating device for instructing the operation of the traveling motor.
Further equipped with a pressure sensor for detecting the traveling load pressure of the traveling motor,
The control device is
It is determined whether or not the traveling motor is in the overloaded state based on the operation signal of the operating device and the detection signal of the pressure sensor, and when the traveling motor is in the overloaded state, the amount of oil deterioration based on the oil properties. A work machine characterized in that an integrated value is calculated and the replacement time of the traveling motor is estimated based on the integrated value of the oil deterioration amount. In the work machine according to claim 1,
A front work machine that can be equipped with an attachment instead of a bucket,
The front working machine is further provided with an attachment mounting sensor for detecting that the attachment is mounted in place of the bucket.
The control device is
Based on the detection value of the attachment mounting sensor, it is determined whether or not the attachment is mounted on the front work machine in place of the bucket, and when the attachment is mounted, the integrated value of the amount of oil deterioration based on the oil properties. The work machine is characterized in that the replacement time of the attachment is estimated based on the integrated value of the oil deterioration amount.

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