WO2019187564A1

WO2019187564A1 - Hydraulic-oil information notifying device for construction machine

Info

Publication number: WO2019187564A1
Application number: PCT/JP2019/002330
Authority: WO
Inventors: 細　幸広
Original assignee: コベルコ建機株式会社
Priority date: 2018-03-28
Filing date: 2019-01-24
Publication date: 2019-10-03
Also published as: JP7069945B2; JP2019173363A

Abstract

Provided is a hydraulic-oil information notifying device enabling an appropriate check on the amount of hydraulic oil regardless of an operating condition of hydraulic cylinders provided in a construction machine. The construction machine (1) is provided with an operating condition information acquiring unit (31) for acquiring operating condition information about hydraulic cylinders (12a, 12b, 12c), a cylinder oil amount estimating unit (32) for estimating the amount of cylinder oil held by the hydraulic cylinders (12a, 12b, 12c) on the basis of the operating condition information, a tank oil amount measuring unit (33) for measuring the amount of tank oil in an oil tank (21), and an oil amount information notifying unit (34) for outputting information relating to a shortage state or a shortage amount of hydraulic oil in a hydraulic excavator (1) on the basis of an estimated value for the amount of cylinder oil and a measured value for the amount of tank oil.

Description

Hydraulic oil information notification device for construction machinery

The present invention relates to an apparatus for informing information on the amount of hydraulic oil of a construction machine such as a hydraulic excavator.

In a construction machine such as a hydraulic excavator, during operation, the hydraulic oil stored in the oil tank is supplied to a hydraulic actuator such as a hydraulic cylinder via a hydraulic pump to operate the hydraulic actuator. The hydraulic oil discharged from the hydraulic actuator is returned to the oil tank.

As this type of construction machine, for example, as seen in Patent Document 1, a level gauge indicating the level of hydraulic oil in the oil tank is attached to the oil tank, and the operator visually recognizes the level gauge. Thus, it is generally known that it is possible to confirm whether or not the amount of hydraulic oil in the oil tank is within an appropriate range.

JP 2007-212382 A

The hydraulic actuator provided in construction machines such as a hydraulic excavator generally includes a relatively large hydraulic cylinder. In the hydraulic cylinder, the amount of hydraulic oil filled in the entire oil chamber changes according to the operating state (expanded state) of the hydraulic cylinder. As a result, the amount of hydraulic oil in the oil tank also changes according to the operating state of the hydraulic cylinder.

For this reason, in this type of construction machine, when an operator confirms the amount of hydraulic oil in the oil tank using a level gauge such as that disclosed in Patent Document 1, usually, the standard of the hydraulic cylinder for the confirmation is used. An operating state (or a posture state of a working device such as a boom, an arm, or a bucket driven by the hydraulic cylinder) is determined.

And after the hydraulic cylinder is kept in the standard operating state, the operator checks the amount of hydraulic oil in the oil tank with a level gauge. Furthermore, when it is determined by this check that the amount of hydraulic oil is insufficient, the operator replenishes the oil tank with the insufficient amount of hydraulic oil while visually checking the level gauge.

However, it is easy for the operator to operate the hydraulic cylinder to the standard operating state each time in order to check the amount of hydraulic oil in the oil tank, and the operator can operate the construction machine. It is necessary to ensure.

Also, depending on the location of the construction machine and the like, there are many cases where it is difficult to operate the hydraulic cylinder to the standard operating state due to the occurrence of interference with surrounding objects. In such a case, it is necessary to move the construction machine to an appropriate location and then operate the hydraulic cylinder to the standard operating state. It will be difficult to run with.

It is an object of the present invention to provide a construction machine hydraulic oil information notification device capable of appropriately checking the amount of hydraulic oil regardless of the operating state of a hydraulic cylinder provided in the construction machine. To do.

The present invention includes a first oil chamber and a second oil chamber that can store hydraulic oil, and the first oil chamber and the second oil chamber receive the supply of hydraulic oil to one of the first oil chamber and the second oil chamber. It operates by discharging hydraulic oil from the other of the first oil chamber and the second oil chamber, and the total volume that is the sum of the volumes of the first oil chamber and the second oil chamber changes with the operation. The construction machine comprising: a hydraulic system including: at least one hydraulic cylinder; and an oil tank that stores hydraulic oil supplied to the at least one hydraulic cylinder and receives hydraulic oil discharged from the at least one hydraulic cylinder. A hydraulic fluid information notifying device for a construction machine for notifying information relating to the amount of hydraulic oil contained in a hydraulic system, the operational state information indicating an operational state of the hydraulic cylinder according to the total volume Based on the operation state information acquisition unit to be acquired and output and the operation state information output from the operation state information acquisition unit, a cylinder oil amount that is the amount of hydraulic oil stored in the at least one hydraulic cylinder is estimated. A cylinder oil amount estimation unit, a tank oil amount measurement unit that measures a tank oil amount that is an amount of hydraulic oil stored in the oil tank, and at least the cylinder oil amount estimated by the cylinder oil amount estimation unit; Based on the tank oil amount measured by the tank oil amount measurement unit, information indicating whether the amount of hydraulic oil contained in the hydraulic system is sufficient or insufficient, and the hydraulic oil contained in the hydraulic system An oil amount information notification unit that determines notification information including at least one of the information indicating the shortage amount and outputs the notification information.

FIG. 1 is a side view of a hydraulic excavator as an example of a construction machine according to an embodiment of the present invention. FIG. 2 is a diagram showing a system configuration of a main part of the hydraulic excavator according to the embodiment of the present invention. FIG. 3 is a diagram schematically showing an internal configuration and a hydraulic circuit of a hydraulic cylinder provided in the hydraulic excavator according to the embodiment of the present invention. FIG. 4 is a flowchart showing the processing of the control device shown in FIG.

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a hydraulic excavator 1 as an example of a construction machine according to the present embodiment. FIG. 2 is a diagram illustrating a system configuration of a main part of the excavator 1 according to the present embodiment. FIG. 3 is a diagram schematically showing an internal configuration and a hydraulic circuit of a hydraulic cylinder provided in the hydraulic excavator according to the present embodiment. FIG. 4 is a flowchart showing the processing of the control device shown in FIG. With reference to FIG. 1, the hydraulic oil information notification device according to the present embodiment is provided in a hydraulic excavator 1 as an example of a construction machine. The hydraulic excavator 1 includes a crawler type traveling body 2, a revolving body 3 mounted on the traveling body 2, and a working device 4 attached to the revolving body 3.

The traveling body 2 is assembled with a pair of hydraulic motors (not shown) as traveling actuators that respectively drive the left and right crawlers.

The turning body 3 is attached to the traveling body 2 so as to be able to turn in the direction (yaw direction) around the turning axis Cz in the vertical direction with respect to the traveling body 2, and a hydraulic motor as a turning actuator. It is swiveled by a swivel drive device 7 including a swivel gear (not shown) and a swivel gear (not shown). A driver's cab 5 in which an operator is boarded is provided at the front part of the swivel body 3, and a machine room 6 in which various machines such as an engine and hydraulic equipment (not shown) are accommodated is provided at the rear part. ing.

The working device 4 includes a boom 11a extending from the front portion of the revolving structure 3, an arm 11b extending from the distal end portion of the boom 11a, and an attachment 11c (in the illustrated example) assembled to the distal end portion of the arm 11b. Bucket) and a hydraulic system 100 (FIG. 2) for driving the boom 11a, the arm 11b, and the attachment 11c. The hydraulic system 100 includes a boom hydraulic cylinder 12a as an actuator that swings the boom 11a in the pitch direction (a direction around the horizontal axis of the swing body 3) with respect to the swing body 3, and an arm 11b with respect to the boom 11a. An arm hydraulic cylinder 12b as an actuator that swings in the pitch direction, and an attachment hydraulic cylinder 12c that swings the attachment 11c in the pitch direction with respect to the arm 11b are provided.

In the present embodiment, these

hydraulic cylinders

12a, 12b, and 12c correspond to the hydraulic cylinders in the present invention. In the following description, when it is not necessary to distinguish between the

hydraulic cylinders

12a, 12b, and 12c, each is simply referred to as a hydraulic cylinder 12.

In addition, as shown in FIG. 2, the hydraulic system 100 of the excavator 1 includes an oil tank 21 that stores hydraulic oil for driving each hydraulic actuator including the hydraulic cylinders 12 (12 a, 12 b, 12 c), and each hydraulic actuator. A hydraulic circuit device 22 configured to supply hydraulic oil from the oil tank 21 to each hydraulic actuator during the operation of the hydraulic tank and to return the hydraulic oil discharged from each hydraulic actuator to the oil tank 21 is mounted. That is, the oil tank 21 stores the hydraulic oil supplied to the at least one hydraulic cylinder 12 and receives the hydraulic oil discharged from the at least one hydraulic cylinder 12. The oil tank 21 and the hydraulic circuit device 22 are accommodated in the machine room 6.

The hydraulic actuator includes a hydraulic motor for traveling the traveling body 2 and a hydraulic motor for rotating the revolving body 3 in addition to the

hydraulic cylinders

12a, 12b, and 12c.

The hydraulic circuit device 22 has a known circuit configuration including a pump and a directional switching valve for each hydraulic actuator, and each hydraulic actuator is connected to the oil tank 21 via the hydraulic circuit device 22.

FIG. 3 schematically shows the configuration of the hydraulic circuit device 22 relating to each hydraulic cylinder 12. As shown in the figure, each hydraulic cylinder 12 includes a cylinder 121, a piston 122 slidable in the axial direction in the cylinder 121, and a rod 123 extending from the piston 122. A bottom-side oil chamber 124a (first oil chamber) and a rod-side oil chamber 124b (second oil chamber) separated by the piston 122 are formed therein.

The hydraulic circuit device 22 includes a direction switching valve 222 connected to the bottom side oil chamber 124a and the rod side oil chamber 124b of the hydraulic cylinder 12 via

oil passages

221a and 221b, and the direction switching valve 222 as an oil tank. 21, a meter-in side oil passage 223 and a meter-out side oil passage 224 connected to 21, and a pump 225 interposed in the meter-in side oil passage 223.

In this case, the direction switching valve 222 is driven by operating an operating device such as an operating lever (not shown) disposed in the cab 5 with the pump 225 being driven by an engine (not shown). And by the drive, the meter-in side oil passage 223 communicates with one side of the

oil passages

221a and 221b, and the meter-out side oil passage 224 communicates with the other side of the

oil passages

221a and 221b.

Thus, the oil tank 21 is operated to one side of the bottom side oil chamber 124a and the rod side oil chamber 124b of the hydraulic cylinder 12 through one of the meter-in side oil passage 223, the direction switching valve 222, and the

oil passages

221a and 221b. Oil is supplied, and hydraulic oil discharged from the other side of the bottom side oil chamber 124a and the rod side oil chamber 124b passes through the other of the

oil passages

221a and 221b, the direction switching valve 222 and the meter-out side oil passage 224. Is returned to the oil tank 21.

As a result, the hydraulic cylinder 12 is driven so that the piston 122 and the rod 123 of the hydraulic cylinder 12 move in the axial direction of the cylinder 121 (the rod 123 expands and contracts outside the cylinder 121).

That is, the hydraulic cylinder 12 includes a first oil chamber and a second oil chamber that can store hydraulic oil, and the first oil is supplied to one of the first oil chamber and the second oil chamber while receiving the hydraulic oil. The operation is performed by discharging hydraulic oil from the other of the chamber and the second oil chamber, and the total volume, which is the sum of the volumes of the first oil chamber and the second oil chamber, is changed in accordance with the operation. When the piston 122 and the rod 123 move in the axial direction, the total volume of the first oil chamber and the second oil chamber changes according to the amount of the piston rod 123 entering the cylinder.

Returning to FIG. 2, the hydraulic excavator 1 further includes a control device 30 having a function of performing operation control of the hydraulic excavator 1, and a cylinder operation detection sensor 40 for detecting the operation state of each hydraulic cylinder 12. A liquid level sensor 41 for detecting the level of the hydraulic oil in the oil tank 21; a temperature sensor 42 for detecting the temperature of the hydraulic oil in the oil tank 21; A display 45 for displaying information is mounted. In addition, an oil amount gauge 43 capable of easily visually confirming the amount of hydraulic oil in the oil tank 21 is assembled to the side surface of the oil tank 21.

The oil amount gauge 43 is a gauge having a known structure configured such that the liquid level or float height of the liquid inside thereof increases and decreases as the amount of hydraulic oil in the oil tank 21 increases and decreases. Alternatively, it is possible to recognize the amount of hydraulic oil in the oil tank 21 by visually recognizing the height (vertical position) of the float.

The cylinder motion detection sensor 40 includes, for example, an angle sensor 40a that detects a rotation angle of the boom 11a with respect to the swing body 3 (hereinafter referred to as a first rotation angle) and a rotation angle of the arm 11b with respect to the boom 11a (hereinafter referred to as a second rotation). Angle sensor 40b for detecting an angle) and an angle sensor 40c for detecting a rotation angle of the attachment 11c with respect to the arm 11b (hereinafter, a third rotation angle). These

angle sensors

40a, 40b, and 40c are constituted by, for example, a rotary encoder, a resolver, and the like, and are assembled to the work device 4.

Here, each of the first rotation angle, the second rotation angle, and the third rotation angle includes the displacement amount of the rod 123 (or the piston 122) of the boom hydraulic cylinder 12a, the rod 123 (or the arm hydraulic cylinder 12b). Each of the displacement amount of the piston 122) and the displacement amount of the rod 123 (or the piston 122) of the attachment hydraulic cylinder 12c has a certain correlation. Therefore, based on the detected values of the first rotation angle, the second rotation angle, and the third rotation angle, the boom hydraulic cylinder 12a, the arm hydraulic cylinder 12b, and the attachment hydraulic cylinder 12c are based on the correlation. Each operation state (posture of the excavator 1) can be specified.

The cylinder motion detection sensor 40 is configured so that the displacement amount (stroke) of each rod 123 of the boom hydraulic cylinder 12a, the arm hydraulic cylinder 12b, and the attachment hydraulic cylinder 12c is used instead of the

angle sensors

40a, 40b, and 40c. A displacement sensor capable of detecting (quantity) may be provided.

The liquid level sensor 41 is constituted by, for example, a laser type distance measuring sensor, and is assembled to the upper surface portion of the oil tank 21. In this case, the liquid level sensor 41 receives the reflected light while irradiating the laser light toward the liquid level of the hydraulic oil in the oil tank 21, thereby reaching the liquid level of the hydraulic oil in the oil tank 21. (In other words, the height of the liquid level) is measured by a triangulation method or a TOF method (TOF: Time of Flight), and a detection signal corresponding to the measured value of the distance is output.

The liquid level sensor 41 is not limited to the laser type distance measuring sensor, and for example, an infrared type or ultrasonic type distance measuring sensor or a float type level sensor may be used.

The temperature sensor 42 (temperature information output unit) is configured by a thermistor or the like, and is assembled to the side surface of the oil tank 21 so that the temperature of the hydraulic oil in the oil tank 21 can be detected. The temperature sensor 42 may be assembled in an oil passage that communicates with the oil tank 21. Further, the temperature sensor 42 may detect the temperature of the internal hydraulic oil by detecting the temperature of the outer wall of the oil tank 21. That is, the temperature sensor 42 outputs temperature information related to the temperature of the hydraulic oil stored in the oil tank 21.

The display unit 45 is composed of a liquid crystal display, an organic EL display, or the like, and is installed in the cab 5.

The control device 30 is composed of one or more electronic circuit units including a microcomputer, a memory, an interface circuit, and the like. The control device 30 receives detection signals from the cylinder motion detection sensor 40, the liquid level sensor 41, and the temperature sensor 42.

And the control apparatus 30 contains the function as a hydraulic-fluid information alerting | reporting apparatus (hydraulic oil amount measuring apparatus) of a construction machine as a function implement | achieved by the hardware configuration and / or program (software structure) which were mounted. . The hydraulic oil information notification device notifies information related to the amount of hydraulic oil contained in the hydraulic system 100 of the hydraulic excavator 1, and includes the control device 30, the cylinder operation detection sensor 40, the liquid level sensor 41, the temperature. The sensor 42 is configured.

More specifically, the control device 30 is based on the detection signal of the cylinder motion detection sensor 40, and indicates information (specifically, an operational state of each hydraulic cylinder 12 (an operational state that changes corresponding to the change in the total volume)). Includes a function as an operation state information acquisition unit 31 that acquires and outputs a displacement amount of the piston 122 or the rod 123 of each hydraulic cylinder 12 and the information (operation state) that the operation state information acquisition unit 31 outputs. Information), the amount of hydraulic oil retained by each hydraulic cylinder 12 (specifically, the amount of hydraulic oil filled in the bottom side oil chamber 124a and the rod side oil chamber 124b. The first oil chamber and the second oil). The total amount of hydraulic oil stored in the chamber (hereinafter referred to as the cylinder oil amount Vs) and the function of the cylinder oil amount estimation unit 32 and the detection signal of the liquid level sensor 41 21, the function as the tank oil amount measuring unit 33 that measures the amount of hydraulic oil (hereinafter referred to as “tank oil amount Vt”) and the determination of whether or not the hydraulic oil amount of the hydraulic excavator 1 is insufficient. And a function as an oil amount information notifying unit 34 that outputs notification information regarding the appropriateness of the amount and the like.

Furthermore, the control device 30 can control the display of the display unit 45, and can be used for a mobile terminal 50 such as a smartphone, a tablet terminal, or a feature phone, and Wi-Fi (registered trademark), Bluetooth (registered trademark), or the like. Wireless communication can be performed using a communication method. In this case, a predetermined application is installed in the portable terminal 50 in advance, and various information transmitted from the control device 30 can be displayed in a state where the application is activated.

Next, the processing of the control device 30 regarding the hydraulic oil amount of the excavator 1 will be described with reference to the flowchart of FIG.

When the control device 30 is activated (or the control device 30) in a state where the operation of the excavator 1 (specifically, the travel operation of the traveling body 2, the swing operation of the revolving structure 3, and the operation of the work device 4) is stopped. When a predetermined input operation is performed), the control device 30 executes the process shown in the flowchart of FIG.

In STEP 1, the control device 30 performs a process of measuring the current tank oil amount Vt by the tank oil amount measuring unit 33 (measurement of the tank oil amount Vt). In this processing, the tank oil amount measuring unit 33 acquires the detection signal of the liquid level sensor 41 and detects the liquid level (the distance to the liquid level of the hydraulic oil in the oil tank 21) indicated by the detection signal. From the value, the tank oil amount Vt (measured value) is obtained using function data (arithmetic formula, map data, etc.) prepared in advance as a correlation between the liquid level and the tank oil amount.

Next, in STEP 2, the control device 30 uses the operation state information acquisition unit 31 to acquire information indicating the current operation state of each hydraulic cylinder 12 (displacement amount of the rod 123 or the piston 122 of each hydraulic cylinder 12). Execute (obtain operating status information).

In this process, the operation state information acquisition unit 31 takes in the detection signals of the cylinder operation detection sensor 40 (

angle sensors

40a, 40b, 40c). Then, the operation state information acquisition unit 31 obtains a correlation between the first rotation angle and the displacement amount of the rod 123 (or piston 122) of the boom hydraulic cylinder 12a from the detection value of the first rotation angle by the angle sensor 40a. The displacement (measured value) of the rod 123 (or piston 122) of the boom hydraulic cylinder 12a is obtained using function data (calculation formula, map data, etc.) created in advance as a representation.

Similarly, the operation state information acquisition unit 31 determines the correlation between the second rotation angle and the displacement amount of the rod 123 (or piston 122) of the arm hydraulic cylinder 12b from the detection value of the second rotation angle by the angle sensor 40b. The displacement amount (measured value) of the rod 123 (or piston 122) of the arm hydraulic cylinder 12b is obtained using the function data (calculation formula, map data, etc.) representing Further, the operation state information acquisition unit 31 obtains a correlation between the third rotation angle and the displacement amount of the rod 123 (or piston 122) of the attachment hydraulic cylinder 12c from the detection value of the third rotation angle by the angle sensor 40c. The displacement amount (measured value) of the rod 123 (or piston 122) of the attachment hydraulic cylinder 12c is obtained using the function data (calculation formula, map data, etc.).

The displacement amount of the rod 123 (or piston 122) of each hydraulic cylinder 12 obtained in STEP 2 is more specifically the displacement amount from the reference position of the rod 123 (or piston 122) of each hydraulic cylinder 12. In this case, the reference position can be set arbitrarily.

Next, in STEP 3, the control device 30 causes the cylinder oil amount estimation unit 32 to execute a process of estimating the current cylinder oil amount Vs of each hydraulic cylinder 12 (estimation of the cylinder oil amount Vs). In this process, the cylinder oil amount estimation unit 32 calculates the estimated value of the cylinder oil amount Vs of each hydraulic cylinder 12 by the following equations (1a) to (1c) defined according to the size of the hydraulic cylinder 12. .
Vs = V1 + V2 (1a)
However,
V1 = volume of bottom side oil chamber = π × (Ds / 2) ² × L1 (1b)
V2 = volume of the oil chamber on the rod side = π × (Ds / 2) ² × L2−π × (Dr / 2) ² × L2 (1c)
Here, referring to FIG. 3, Ds in the equations (1b) and (1c) is the inner diameter of the cylinder 121 of the hydraulic cylinder 12, Dr is the outer diameter of the rod 123 of the hydraulic cylinder 12, and L1 is the bottom side oil chamber 124a. , L2 is the length of the rod side oil chamber 124b in the axial direction.

In this case, the values of Ds and Dr are stored in advance in the memory of the control device 30 for each hydraulic cylinder 12.

L1 and L2 are the measured value of the displacement amount of the rod 123 (or piston 122) of each hydraulic cylinder 12, and L1 + L2 = L−L3 = a constant value (where L is the axial direction inside the cylinder 121) (Length, L3: thickness of piston 122).

For example, in STEP 2, for each hydraulic cylinder 12, one value of L 1 and L 2 can be obtained as a measured value of the displacement amount of the rod 123 (or piston 122) of the hydraulic cylinder 12. In this case, the other value of L1 and L2 can be calculated from one value and the relational expression L1 + L2 = L−L3.

In addition, without obtaining the values of L1 and L2 or the values of V1 and V2, separately, from the displacement amount of the rod 123 (or piston 122) of each hydraulic cylinder 12, for example, using map data or an arithmetic expression, It is also possible to directly determine the cylinder oil amount Vs of the hydraulic cylinder 12.

As described above, the cylinder oil amount Vs (estimated value) obtained for each hydraulic cylinder 12 changes according to the displacement amount of the rod 123 (or piston 122) of each hydraulic cylinder 12. In this case, as the length of the rod 123 outside the cylindrical body 121 (the amount of protrusion from the cylindrical body 121) is larger, the volume of the rod 123 existing inside the cylindrical body 121 is decreased, and thus the cylinder oil amount Vs is increased. To do.

In the following description, in order to distinguish the cylinder oil amount Vs for each hydraulic cylinder 12, the cylinder oil amount Vs of the boom hydraulic cylinder 12a is Vsa, the cylinder oil amount Vs of the arm hydraulic cylinder 12b is Vsb, and the attachment. The cylinder oil amount Vs of the hydraulic cylinder 12c for use may be expressed as Vsc.

Returning to the description of FIG. 4, the control device 30 then performs the processing of STEP 4 to 9 by the oil amount information notification unit 34.

In STEP 4, the oil amount information notification unit 34 calculates the tank oil amount Vt obtained in STEP 1 and the cylinder oil amounts Vsa, Vsb, Vsc of all the hydraulic cylinders 12 (12a, 12b, 12c) obtained in STEP 3. The total oil amount Vall (= Vt + Vsa + Vsb + Vsc) is calculated by adding the estimated value (calculation of the total oil amount Vall).

Next, in STEP 5, the oil amount information notification unit 34 performs a process of correcting the calculated value of the total oil amount Vall according to the detected value of the current temperature Toil of the hydraulic oil indicated by the detection signal of the temperature sensor 42. (Correct the total oil amount Vall). In this process, for example, a value Vall_c obtained by correcting the total oil amount Vall is obtained by performing calculations of the following equations (2a) and (2b).
Vall_c = Vall−δ (Toil) (2a)
However,
δ (Toil) = Vall × α × (Toil−Tbase) (2b)
Here, δ (Toil) is a volume expansion amount corresponding to the temperature Toil of the hydraulic oil, α is a thermal expansion coefficient of the hydraulic oil, and Tbase is a reference temperature (for example, normal temperature). By correcting the total oil amount Vall in this way, the corrected total oil amount Vall_c indicates the total oil amount at a predetermined reference temperature Tbase.

When the deviation between the detected value of the hydraulic oil temperature Toil and the reference temperature Tbase falls within a predetermined range, or after the hydraulic excavator 1 stops operating, the hydraulic oil temperature Toil is equal to or close to the reference temperature Tbase. In the case where it is clear that the pressure is lowered (for example, when the duration of the operation stop of the hydraulic excavator 1 is sufficiently long), in STEP5, it is possible to set Val_c = Vall.

Next, in STEP 6, the oil amount information notification unit 34 determines whether or not the total oil amount Val_c after correction is in a state where the total oil amount Val_c is insufficient (whether or not hydraulic oil needs to be replenished). To determine whether or not the total oil amount Vall_c is smaller than the determination reference value Vth. In other words, the processing of STEP 6 is, in other words, the determination reference value (= Vth + δ (Toil)) obtained by correcting the total oil amount Vall calculated in STEP 4 and the determination reference value Vth by the volume expansion amount δ (Toil). ) Is equivalent to the processing to be compared.

If the determination result in STEP 6 is negative (NO in STEP 6), the total oil amount Vall_c is an appropriate amount (not insufficient). In this case, the process shown in the flowchart of FIG.

On the other hand, when the determination result in STEP 6 is affirmative (YES in STEP 6), the total oil amount Vall_c is insufficient. In this case, the oil amount information notifying unit 34 in STEP 7 includes hydraulic oil shortage information (in other words, information indicating that the hydraulic oil should be replenished) indicating that the hydraulic oil is insufficient, and hydraulic oil. The deficiency amount information indicating the deficiency amount ΔV (in other words, the required amount of hydraulic oil replenishment) is displayed on the display unit 45. In this case, the shortage amount ΔV is calculated, for example, as a value obtained by subtracting the calculated value of the total oil amount Vall_c obtained in STEP 5 from a value larger than the determination reference value Vth by a predetermined amount.

The deficiency information is not limited to the numerical value of the deficiency ΔV. For example, the deficiency ΔV is information obtained by converting the deficiency ΔV into the amount of change in the liquid level or float height of the oil amount gauge 43 (for example, oil amount gauge 43) (information indicating the amount of change represented by a scale attached to 43).

As described above, the hydraulic oil shortage information and the shortage amount information are displayed on the display 45, so that the driver of the excavator 1 should replenish the hydraulic tank 21 with hydraulic oil according to the display on the display 45. And the shortage amount ΔV of hydraulic oil can be recognized.

In STEP 7, instead of visually informing the hydraulic oil shortage information and the shortage amount information on the display unit 45 or in addition to visual notification on the display unit 45, the hydraulic oil shortage information and the shortage amount information are displayed. You may make it alert | report by an audio | voice etc. auditorily.

The oil amount information notification unit 34 further determines in STEP 8 whether there is a mobile terminal 50 that can communicate. If this determination result is negative (NO in STEP 8), the processing shown in the flowchart of FIG. 4 is terminated.

If the determination result in STEP 8 is affirmative (YES in STEP 8), the oil amount information notification unit 34 causes the terminal information to be displayed on the portable terminal 50 while sequentially updating notification information related to the hydraulic oil amount in STEP 9. Execute the process.

In this terminal notification process, the oil amount information notification unit 34 sequentially acquires the measurement value of the tank oil amount Vt at a predetermined control processing cycle via the tank oil amount measurement unit 33 and performs the processing of STEPs 4 and 5. By sequentially executing, the total oil amount Vall_c is sequentially calculated. Then, every time the total oil amount Val_c is calculated, the oil amount information notification unit 34 executes the same determination process as STEP 6 for the new calculated value of the total oil amount Val_c, and the determination result is affirmative. Then, the same or similar information (both notification information) as the hydraulic oil shortage information and the shortage amount information is transmitted (output) to the portable terminal 50 and displayed on the portable terminal 50.

And if the judgment result of the same judgment process as STEP6 becomes negative, the oil quantity information alerting | reporting part 34 will stop transmitting the same or similar information to the said hydraulic oil shortage information and shortage quantity information to the portable terminal 50. Then, the display of the information is terminated.

By performing the terminal notification process as described above, an operator who replenishes the oil tank 21 with hydraulic oil confirms the information to be displayed on the portable terminal 50 and supplies the hydraulic tank 21 with the insufficient amount of hydraulic oil to the oil tank 21. Replenishment can be performed smoothly. It is desirable that at least the operation of the hydraulic cylinder 12 is stopped when the hydraulic oil is replenished. In this case, since the hydraulic oil does not flow between the hydraulic cylinder 12 and the oil tank 21, the amount of the hydraulic oil in the oil tank 21 is accurately detected by the liquid level sensor 41 as the hydraulic oil is replenished. . In this case, the oil amount information notifying unit 34 acquires the tank oil amount Vt output from the tank oil amount measuring unit 33, and transmits information related to the tank oil amount Vt or the amount of hydraulic oil contained in the hydraulic system 100 to the portable terminal. It may be output to. When the operation of the hydraulic cylinder 12 is stopped, the amount of hydraulic oil stored in the hydraulic cylinder 12 does not change, so the oil amount information notification unit 34 sets the cylinder oil amount to the tank oil amount Vt that changes at the time of replenishment. By adding the amount Vs (fixed value), the amount of hydraulic oil (or the amount of change) of the hydraulic system 100 as a whole can be output. In the case where the oil tank 21 is shared with other hydraulic actuators, it is desirable that the hydraulic oil is replenished to the oil tank 21 with the operation of the other hydraulic actuators also stopped.

In STEP 9, in addition to displaying the same or similar information on the hydraulic oil shortage information and the shortage amount information on the portable terminal 50, or instead of displaying the information, an audible notification output by voice or the like is given to the portable terminal. 50 may occur.

In the present embodiment, since the processing in the control device 30 is executed as described above, the hydraulic pressure does not depend on the operating state of each hydraulic cylinder 12 (in other words, regardless of the posture state of the working device 4). The notification information indicating the suitability of the amount of hydraulic oil held by the excavator 1 can be accurately output via the display 45 or the portable terminal 50. In particular, the oil amount information notification unit 34 is included in the hydraulic system 100 based on at least the cylinder oil amount Vs estimated by the cylinder oil amount estimation unit 32 and the tank oil amount Vt measured by the tank oil amount measurement unit 33. Notification information including at least one of information indicating whether the amount of hydraulic fluid to be supplied is sufficient or insufficient and information indicating the amount of hydraulic oil included in the hydraulic system 100 is determined, and the notification information is output. To do. As a result, the worker or the like can appropriately confirm whether or not the amount of hydraulic oil is appropriate in a state where the working device 4 is stopped in an arbitrary posture state. As described above, the oil amount information notification unit 34 includes at least the cylinder oil amount Vs estimated by the cylinder oil amount estimation unit 32, the tank oil amount Vt measured by the tank oil amount measurement unit 33, and the temperature sensor. It is desirable to determine the notification information based on the hydraulic oil temperature Toil output by 42 and output the notification information.

In addition, since the operator and the like can acquire the hydraulic oil shortage information (information indicating the shortage state) and the shortage amount information through the portable terminal 50 possessed by the worker, the amount of hydraulic oil near the inlet of the oil tank 21 can be obtained. Appropriateness can be confirmed. For this reason, when the amount of hydraulic oil is insufficient, the operation of quickly replenishing hydraulic oil to the oil tank 21 can be started.

In addition, even during the operation of replenishing the hydraulic oil to the oil tank 21, the operator and the like can acquire the hydraulic oil shortage information and the shortage amount information in real time via the portable terminal 50, and thus easily recognize the completion timing of the replenishment work. And the replenishing operation can be performed efficiently.

Note that the present invention is not limited to the embodiment described above, and other embodiments can be adopted. Several other embodiments will be described below.

In the above embodiment, whether or not the hydraulic oil amount of the excavator 1 is insufficient is determined in STEP 6 by comparing the total oil amount Vall_c, which is the sum of the tank oil amount Vt and the cylinder oil amount Vs, with the determination reference value Vth. Judgment was made. However, for example, it may be determined whether or not the amount of hydraulic oil is insufficient by the following method.

That is, when the hydraulic oil amount of the hydraulic excavator 1 (hydraulic system 100) is an appropriate amount, the value of the tank oil amount (hereinafter referred to as the appropriate tank oil amount) is the cylinder oil amount in the current operation state of each hydraulic cylinder 12. An estimated value (or a value obtained by correcting the estimated value according to the temperature Toil of the hydraulic oil) of the total cylinder oil amount, which is the sum of Vsa, Vsb, and Vsc, and the total cylinder in the reference posture state of the work device 4 It is set according to the deviation from the oil amount value (predetermined value). Then, the hydraulic oil amount of the excavator 1 is insufficient by comparing the measured value of the tank oil amount Vt (or a value obtained by correcting the measured value according to the temperature Toil of the hydraulic oil) with the set appropriate tank oil amount. It is determined whether or not it is in a state. Even in this case, the determination can be appropriately performed.

In the embodiment, the oil amount information notifying unit 34 outputs the hydraulic oil shortage information and the shortage amount information as notification information when it is determined that the hydraulic oil amount of the excavator 1 is insufficient. I did it. However, for example, only one of the hydraulic oil shortage information and the shortage amount information may be output. Further, even when the hydraulic oil amount of the hydraulic excavator 1 is not insufficient, information indicating that may be output as notification information.

Further, in addition to one or both of the hydraulic oil shortage information and the shortage amount information, or instead of one or both of the hydraulic oil shortage information and the shortage amount information, the total oil amount Val_c (or Vall) and the determination reference value Vth. May be output as notification information.

In the embodiment, the excavator 1 shown in FIG. 1 is exemplified as the construction machine to which the present invention is applied. However, the construction machine to which the present invention can be applied may be a construction machine having another structure. For example, in the construction machine, in addition to the three

hydraulic cylinders

12a, 12b, and 12c described above, the hydraulic cylinder that swings the boom 11a in the yaw direction with respect to the swing body 3 or the boom 11a in the width direction of the swing body 3 is used. The excavator may include a hydraulic excavator including a hydraulic cylinder to be slid, a hydraulic excavator including an attachment including the hydraulic cylinder, a hydraulic excavator including a hydraulic cylinder for a dozer, or a hydraulic excavator including a wheel-type traveling body.

Further, the construction machine is not limited to a hydraulic excavator, and may be a construction machine such as a crane.

<First invention>
The present invention provides an oil chamber that can contain hydraulic oil, receives supply of hydraulic oil to the oil chamber, and discharges hydraulic oil from the oil chamber, thereby changing the volume of the oil chamber. A hydraulic system comprising: at least one hydraulic cylinder that operates together; and an oil tank that stores hydraulic oil supplied to the at least one hydraulic cylinder and that receives hydraulic oil discharged from the at least one hydraulic cylinder. A hydraulic fluid information notifying device for a construction machine for notifying information relating to an amount of hydraulic oil contained in the hydraulic system of a construction machine, and obtaining operational state information indicating an operational state of the hydraulic cylinder according to the total volume and Based on the operating state information output from the operating state information acquisition unit to be output and the operating state information acquisition unit, the at least one hydraulic cylinder A cylinder oil amount estimation unit that estimates a cylinder oil amount that is the amount of hydraulic oil stored in the tank, a tank oil amount measurement unit that measures a tank oil amount that is the amount of hydraulic oil stored in the oil tank, Is the amount of hydraulic oil included in the hydraulic system sufficient based on at least the cylinder oil amount estimated by the cylinder oil amount estimation unit and the tank oil amount measured by the tank oil amount measurement unit? Determining notification information including at least one of information indicating whether the hydraulic oil is insufficient (appropriateness of hydraulic oil amount) and information indicating the insufficient amount of hydraulic oil included in the hydraulic system (degree of decrease in hydraulic oil amount); An oil amount information notifying unit for outputting the notification information.

In the present invention, the amount of hydraulic oil in the construction machine means the amount of hydraulic oil retained in the construction machine (hydraulic system 100) including the cylinder oil amount and the tank oil amount. The notification information regarding the appropriateness and the degree of decrease in the amount of hydraulic oil is the person who receives the notification information (operator) whether or not the amount of hydraulic oil is an appropriate amount, and the amount of hydraulic oil relative to the appropriate amount. It means information that can be recognized as to whether or not the degree is lowered.

According to said structure, since the said oil quantity information alerting | reporting part outputs the said alerting | reporting information based on the said cylinder oil amount (estimated value) and the said tank oil amount (measured value) at least, this alerting | reporting information is received. The person can obtain information that can evaluate the suitability of the amount of hydraulic oil retained in the construction machine, regardless of the operating state of the hydraulic cylinder provided in the construction machine. Therefore, it is possible to appropriately check the amount of hydraulic oil regardless of the operating state of the hydraulic cylinder provided in the construction machine.

<Second invention>
In the above configuration, the apparatus further includes a temperature information output unit that outputs temperature information related to the temperature of the hydraulic oil stored in the oil tank, and the oil amount information notification unit is estimated by the cylinder oil amount estimation unit. Determining the notification information based on a cylinder oil amount, the tank oil amount measured by the tank oil amount measurement unit, and the temperature information output by the temperature information output unit, and outputting the notification information; desirable.

According to the above configuration, it is possible to output the notification information in a manner that takes into account volume expansion in accordance with the temperature of the hydraulic oil. As a result, the reliability of the broadcast information can be improved.

<Third invention>
In the above-described configuration, the oil amount information notification unit is based on at least the cylinder oil amount estimated by the cylinder oil amount estimation unit and the tank oil amount measured by the tank oil amount measurement unit. The system has a function to determine whether the amount of hydraulic oil contained in the system is sufficient or insufficient. When it is determined that the amount of hydraulic oil contained in the hydraulic system is insufficient, the hydraulic oil is insufficient. It is desirable to output information indicating the state as the notification information.

According to the above configuration, the oil amount information notification unit can appropriately determine whether or not the amount of hydraulic oil in the construction machine is insufficient, regardless of the operating state of the hydraulic cylinder. The notification information indicating that the amount has become insufficient can be output at an appropriate timing. In addition, when combining 3rd invention with the said 2nd invention, the said oil amount information alerting | reporting part is the said cylinder oil amount (estimated value), the said tank oil amount (measured value), and the said temperature information (detected value of temperature). ), It may be configured to determine whether or not the amount of hydraulic oil in the construction machine is in a shortage state.

<Fourth Invention>
In the above configuration, when the oil amount information notification unit determines that the amount of hydraulic oil included in the hydraulic system is insufficient, the oil amount information notification unit displays information indicating the insufficient amount of hydraulic oil included in the hydraulic system. It is desirable to further output as notification information.

According to the above configuration, a person who receives the notification information can easily recognize the amount of hydraulic oil to be replenished in the oil tank.

<Fifth invention>
In the above configuration, the oil amount information notification unit is preferably configured to have a function of outputting the notification information to a portable terminal outside the construction machine.

According to the above configuration, the person who has the portable terminal can obtain the notification information via the portable terminal near the inlet of the oil tank or the like. For this reason, it is possible to smoothly perform the operation of replenishing hydraulic oil to the oil tank.

<Sixth Invention>
In the above configuration, the oil amount information notifying unit acquires the tank oil amount output from the tank oil amount measuring unit in a state where the operation of the hydraulic cylinder is stopped, and the tank oil amount or the hydraulic pressure is acquired. It is desirable that the information regarding the amount of hydraulic oil included in the system is output to the portable terminal.

According to said structure, the person who has the said portable terminal can acquire the said alerting | reporting information via a portable terminal, performing the replenishment operation | work of the hydraulic oil to an oil tank. For this reason, it is possible to perform the replenishment operation of the hydraulic oil while confirming in real time whether or not the shortage of the hydraulic oil amount has been solved. As a result, the replenishment operation can be performed accurately.

Claims

A first oil chamber and a second oil chamber capable of accommodating the hydraulic oil, wherein the first oil chamber and the second oil chamber are supplied with hydraulic oil supplied to one of the first oil chamber and the second oil chamber; At least one hydraulic cylinder that operates by discharging hydraulic oil from the other of the first and second cylinders, and a total volume that is a sum of the volumes of the first oil chamber and the second oil chamber is changed with the operation, An amount of hydraulic oil contained in the hydraulic system of a construction machine including a hydraulic system including a hydraulic tank that stores hydraulic oil supplied to one hydraulic cylinder and receives hydraulic oil discharged from the at least one hydraulic cylinder It is a construction machine hydraulic oil information notification device for notifying information about,
An operation state information acquisition unit that acquires and outputs operation state information indicating an operation state of the hydraulic cylinder according to the total volume;
A cylinder oil amount estimation unit that estimates a cylinder oil amount that is an amount of hydraulic oil stored in the at least one hydraulic cylinder, based on the operation state information output by the operation state information acquisition unit;
A tank oil amount measuring unit for measuring a tank oil amount that is an amount of hydraulic oil stored in the oil tank;
Is the amount of hydraulic oil included in the hydraulic system sufficient based on at least the cylinder oil amount estimated by the cylinder oil amount estimation unit and the tank oil amount measured by the tank oil amount measurement unit? An oil amount information notifying unit for determining notification information including at least one of information indicating whether the information is insufficient and information indicating an insufficient amount of hydraulic oil included in the hydraulic system; and outputting the notification information;
A hydraulic fluid information notifying device for construction machinery.
A hydraulic fluid information notification device for a construction machine according to claim 1,
A temperature information output unit that outputs temperature information related to the temperature of the hydraulic oil stored in the oil tank;
The oil amount information notification unit includes the cylinder oil amount estimated by the cylinder oil amount estimation unit, the tank oil amount measured by the tank oil amount measurement unit, and the temperature information output by the temperature information output unit. The hydraulic oil information notifying device for the construction machine that determines the notification information based on the information and outputs the notification information.
A hydraulic oil information notification device for a construction machine according to claim 1 or 2,
The oil amount information notifying unit is an operation included in the hydraulic system based on at least the cylinder oil amount estimated by the cylinder oil amount estimating unit and the tank oil amount measured by the tank oil amount measuring unit. It has a function of determining whether the amount of oil is sufficient or insufficient, and when it is determined that the amount of hydraulic oil contained in the hydraulic system is insufficient, information indicating a shortage of hydraulic oil is provided. A construction machine hydraulic oil information notification device that outputs the notification information.
A hydraulic fluid information notification device for a construction machine according to claim 3,
When it is determined that the amount of hydraulic oil included in the hydraulic system is insufficient, the oil amount information notification unit further outputs information indicating the insufficient amount of hydraulic oil included in the hydraulic system as the notification information. Hydraulic oil information notification device for construction machinery.
The construction machine hydraulic oil information notification device according to any one of claims 1 to 4,
The said oil quantity information alerting | reporting part is the hydraulic information alerting | reporting apparatus of the construction machine comprised so that it might have a function which outputs the said alerting | reporting information to the portable terminal outside the said construction machine.
A hydraulic fluid information notification device for a construction machine according to claim 5,
The oil amount information notifying unit acquires the tank oil amount output from the tank oil amount measuring unit in a state where the operation of the hydraulic cylinder is stopped, and the tank oil amount or an operation included in the hydraulic system. A hydraulic oil information notifying device for construction machinery configured to output information on the amount of oil to the portable terminal.