How to measure operating time

Abstract

To measure the operating time of work machinery.SOLUTION: An operating time measurement method includes steps of: measuring the operating time of a work machine with a measuring unit; and calculating a storage time to be stored in a storage unit with a control unit on the basis of the operating time. The control unit calculates the measurement time by adding the correction time to the operating time, and calculates the storage time o the basis of the measurement time.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an operating time measuring device. [Background technology]

[0002] Conventionally, hydraulic excavators and other work machines have measured their operating hours, and this measured operating hours has been stored and displayed to help determine when machine maintenance and part replacement are required.

[0003] Patent Document 1 discloses a method for measuring the operating time of a construction machine, in which while it is determined that the engine is running, the engine operating time is calculated using time information from a timer, and the calculated time is stored and accumulated in a memory unit in association with a date and time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4246039 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology of Patent Document 1, the measured operating time is written at a predetermined interval while the construction machine is in operation. Since the writing process is performed periodically, an error occurs between the operating time when the power was turned off and the operating time when the last writing process was performed. If this error increases, it may cause problems such as in determining when maintenance should be performed.

[0006] In view of the above, an object of the present invention is to provide an operating time status storage device capable of measuring and storing operating time more accurately. [Means for solving the problem]

[0007] In order to solve the above problem, the operating time measurement method of the present invention includes a step of a measurement unit measuring the operating time of a work machine, and a step of a control unit calculating a stored time to be stored in a memory unit based on the operating time, wherein the control unit calculates a measured time by adding a correction time to the operating time, and calculates the stored time based on the measured time. Effect of the Invention

[0008] According to the present invention, it is possible to prevent measurement errors from gradually increasing in measurement of operating time. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing an operating time measurement device according to an embodiment of the present invention. [Diagram 2] FIG. 13 is a diagram showing a display screen (a correction time setting screen) of a display unit. [Diagram 3] FIG. 1 is a diagram illustrating an operation time measurement method according to an embodiment of the present invention. [Figure 4] FIG. 13 is a diagram showing an operating time measurement method. [Diagram 5] FIG. 1 is a diagram showing a conventional method for measuring operating time. [Figure 6] FIG. 1 is a diagram illustrating an operation time measurement method according to an embodiment of the present invention. [Figure 7] 3 is a flowchart showing a basic process of a power plant according to an embodiment of the present invention. [Figure 8] 5 is a flowchart showing an operating time measurement process of a control unit according to the embodiment of the present invention. [Figure 9] FIG. 13 is a block diagram showing an operating time measurement device according to a modified example. [Figure 10] 13 is a diagram showing an operating time measuring method according to a modified example. FIG. [Figure 11] 13 is a flowchart showing an operating time measurement process of a control unit according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The operating time measurement device according to the present invention (hereinafter, may be simply referred to as the "measurement device") is a device that measures and stores the operating time of a work machine on which the measurement device is mounted. In addition, work machinery includes, for example, construction machinery and agricultural machinery. Examples of construction machinery include hydraulic excavators, wheel loaders, carriers, cranes, bulldozers, etc., and examples of agricultural machinery include tractors, combines, rice transplanters, etc. Furthermore, the dimensions, materials, and other specific numerical values ​​shown in the following embodiments are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In addition, in this specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0011] [1. Configuration of operating time measurement device] First, the schematic configuration of the operating time measuring device will be described with reference to an example in which it is mounted on a hydraulic excavator.

[0012] Fig. 1 is a block diagram showing a schematic configuration of an operating time measurement device 10 according to this embodiment. As shown in Fig. 1, the operating time measurement device 10 is mounted on a work machine 1, and is connected to a power unit 20 and a display device 30 by a signal line 61 (indicated by a dashed line in the figure). This allows signal communication between the measurement device 10, the power unit 20, and the display device 30. Furthermore, the measurement device 10, the power device 20, and the display device 30 are connected to the power storage device 40 by a power supply line 62 (solid line in the figure) via a key switch 50. This allows the measurement device 10, the power device 20, and the display device 30 to operate only during the period when they are being supplied with power from the power storage device 40 by operating the key switch 50. For the sake of convenience, the working equipment, hydraulic system, and operating device are not shown or described in detail in Fig. 1. The working equipment is, for example, composed of a boom, arm, bucket, etc., and is used for excavation work, etc. The hydraulic system is, for example, composed of a hydraulic pump, hydraulic control valve, hydraulic actuator, etc., and is used to supply hydraulic power to the working equipment. The operating device is, for example, composed of an operating lever and an operating pedal, and is operated by an operator.

[0013] (Operating time measuring device 10) As described above, the operating time measurement device 10 is a device that measures the operating time of the work machine 1 on which it is mounted and stores the measured operating time. The measurement device 10 comprises a control unit 11, a memory unit 12, and a timing unit 13. This measurement device 10 can be provided separately from a control device that controls the entire work machine 1, or it can also be provided integrally with the control device.

[0014] (Control unit 11) The control unit 11 is configured, for example, by an electronic control unit (ECU), reads a program stored in a long-term storage area of ​​the storage unit 12, functions as the measurement device 10, and executes an operating time measurement process (hereinafter sometimes referred to as "measurement process") which will be described in more detail below. The control unit 11 is provided integrally with or separately from a control device that controls the work machine 1. The control device of the work machine 1 includes a prime mover control unit 22 which will be described later.

[0015] (Storage unit 12) The memory unit 12 is configured with a storage device that stores predetermined information related to the measurement processing of the measuring device 10. The memory unit 12 has an internal long-term memory area and a temporary memory area. The long-term memory area is configured with a non-volatile memory such as a ROM (Read Only Memory). The temporary memory area is configured with a volatile memory such as a RAM (Random Access Memory). Information related to the measurement processing is, for example, information including the operation time of the work machine 1. The long-term memory area stores, for example, a program, operation time, a judgment value V Juand the threshold time T th The operating time will be described in detail below.

[0016] In this embodiment, the operating time is calculated by the measurement process as "storage time (read time) T me ", "Correction time T cr ", "Additional time T ad ", "Measurement time T ms " and "Write time T re " are distinguished as follows.

[0017] "Memory time T me " indicates the accumulated operation time of the work machine 1, and is stored in the long-term storage area of ​​the storage unit 12 during the measurement process, and is presented to the operator by being displayed on the display unit 31 of the display device 30. Also, when the work machine 1 is started (during the start-up process described below), it is read into the temporary storage area of ​​the storage unit 12, and the measurement time T ms Configure the initial value of

[0018] In addition, the correction time T cr " is the measurement time T ms and writing time T re This is a correction value to reduce the error of the measurement time T ms When the write process is performed, the measurement time T ms Since the fraction of is rounded down, the measurement time T ms and writing time T re An error occurred in the measurement time T ms and writing time T re and the correction time T cr The relationship between the correction time and the error will be explained in more detail later. cr is stored in the long-term storage area of ​​the storage unit 12, and is read out to the temporary storage area of ​​the storage unit 12 during the start-up process of the operating time measurement device 10. me Together with the measurement time T ms Configure the initial value of

[0019] In addition, "Additional Time T ad " is a value indicating the time during which the work machine 1 actually operated in the measurement process, and is used as the measurement time T ms This "additional time T ad For example, the clock period of the timer unit 13 is used as the "period". The clock period will be described in more detail later.

[0020] In addition, "measurement time T ms " is a time indicating the cumulative value of the operation time in one operation period of the work machine 1, and the memory time T me , correction time T cr and the addition time T ad It is composed of:

[0021] In addition, "threshold time T th " is a threshold value used in the write determination process by the control unit 11, and is a value indicating whether or not the write process is possible. This threshold time T th As will be described in detail later, multiple values ​​are set for each fixed value, and the storage time T me A value is selected based on the relationship between the

[0022] In addition, "write time T re " is the operating time stored in the long-term storage area of ​​the storage unit 12 as a result of the measurement process by the operating time measurement device 10, and is the threshold time T th Write time T re Used as.

[0023] Other information stored in the long-term storage area of ​​the storage unit 12 includes, for example, the judgment value V Ju There is a judgment value V Ju is a threshold value used in the process of determining the operating state of the prime mover 21, and is, for example, 500 rpm. Ju When the above is true, it indicates that the prime mover 21 is in operation.

[0024] (Timekeeping section 13) The timer 13 generates a clock signal and inputs the clock signal to the controller 11 at a predetermined cycle (for example, 1S). Note that the cycle time at which the timer 13 inputs the clock signal to the controller 11 may be called a clock cycle. The clock cycle is also used as an addition time in the measurement process.

[0025] (Power plant 20) The power unit 20 is a power source that drives a hydraulic pump that constitutes the hydraulic device, and is composed of a prime mover 21 and a prime mover control unit 22.

[0026] (Motor 21) In this embodiment, the prime mover 21 is configured by a diesel engine as an example, but it may be an engine other than a diesel engine, an electric motor (electric motor), or a hybrid power source including an engine and an electric motor (electric motor).

[0027] (Motor control section 22) Like the control unit 11, the prime mover control unit 22 is configured with, for example, an electronic control unit (ECU), and controls the drive of the prime mover 21. For example, when the key switch 50 accepts an engine start operation by the operator, the prime mover control unit 22 starts the prime mover 21. On the other hand, when the key switch 50 accepts a key-off operation by the operator, the prime mover control unit 22 stops the prime mover 21. The prime mover control unit 22 also has a function as a detection unit, and acquires operation information (for example, engine speed) indicating the operating state of the prime mover 21, and outputs the operation information to the operating time measurement device 10 via the signal line 61 at a predetermined communication cycle (for example, 10 s).

[0028] (Display device 30) The display device 30 is provided in the driver's seat of the work machine 1, and comprises a display unit 31 that displays various information about the work machine 1, and an operation unit 32 for performing various settings of the work machine 1.

[0029] The display unit 31 is a user interface that presents information to an operator and is configured with a liquid crystal display or an organic EL display that displays various information. In this embodiment, as an example, the display unit 31 is a full-color liquid crystal display with a backlight, and has a "horizontally elongated" display area that is long in the horizontal direction. Note that the display unit 31 also includes terminals that are used outside the machine, such as tablet terminals and PCs.

[0030] An example of a display screen displayed on the display unit 31 will be described with reference to Fig. 2. Fig. 2 is a diagram showing the display screen of the display unit 31. cr 13 is a diagram showing a setting screen for setting the value of . As shown in the figure, the display unit 31 has a title display area 31a showing the title of the display screen, a setting content display area 31b (31b1 to 31b8) showing the setting content, and an operation content display area 31c (31c1 to 31c6) showing the operation content that can be operated by the operator.

[0031] The operation unit 32 is a user interface for accepting operation input by an operator to a display screen displayed on the display unit 31. The operation unit 32 accepts various operations by the operator, for example, by outputting an electric signal according to the operator's operation. In the present embodiment, as an example, the operation unit 32 includes a plurality of mechanical operators (six in this embodiment). Although not shown, these operators are arranged close to (for example, below) the display area of ​​the display unit 31 so as to follow the periphery of the display area. These operators are associated with the respective items of the operation content display area 31c (31c1 to 31c6), and by operating any one of the multiple operators, any one of the items on the display screen is operated (selected).

[0032] Furthermore, the operation unit 32 may include a touch panel, an operation dial, etc. In this case as well, an operation on the operation unit 32 causes an operation (selection) of any item on the display screen.

[0033] (Electricity storage device 40) The power storage device 40 is, for example, a lead storage battery, and supplies driving power to the measurement device 10, the power device 20, the display device 30, etc. The power storage device 40 having such a configuration supplies power to the measurement device 10, the power device 20, and the display device 30 when the key switch 50 is in the key-on state. On the other hand, when the key switch 50 is in the key-off state, the power supply to the measurement device 10, the power device 20, and the display device 30 is stopped.

[0034] (50 key switches) The key switch 50 is, for example, an ignition switch, and depending on the key position, the operating state of the work machine 1 can be transitioned to any one of a key-off state in which no power is supplied to the measuring devices 10, etc., a key-on state in which power is supplied to the measuring devices 10, etc., and an engine start state in which power is supplied to the measuring devices 10, etc. and the prime mover 21 is started.

[0035] [2. Control process of the operating time measurement device 10] Next, the control process in the above-mentioned operating time measurement device 10 will be described.

[0036] A measurement processing method by the operating time measurement device 10 will be described with reference to Figures 3 to 6. Note that it is assumed that the work machine 1 in this embodiment is in a state after having previously operated for 60 seconds.

[0037] The measurement device 10 executes the following measurement processes: "1. Start-up process", "2. Operation information acquisition process", "3. Operation status determination process", "4. Operation time addition process", "5. Measurement time calculation process", "6. Write determination process", and "7. Write process". The contents of each control process are specifically described below.

[0038] (1. Startup process) First, in the working machine 1, when the key switch 50 is turned on by the operator, the control unit 11 executes a start-up process as the measuring device 10. Specifically, the control unit 11 starts the working time (storage time T me) into a temporary storage area (reading process). me Then, the correction time T cr (correction process) In this way, the control unit 11 sets the initial value used in the measurement process by the start-up process consisting of the read process and the correction process.

[0039] In this embodiment, the correction process is executed as part of the start process, but the present invention is not limited to this. The correction process may be executed at any writing process timing from start to key-off.

[0040] (2. Operation information acquisition process) The control unit 11 acquires information indicating the engine speed as operation information of the prime mover 21 from the prime mover control unit 22 of the power unit 20. The control unit 11 acquires the operation information in accordance with the communication cycle of the prime mover control unit 22 described above.

[0041] (3. Operation status determination process) The control unit 11 judges the operating state of the prime mover 21 based on the operating information of the prime mover 21. Specifically, the control unit 11 judges whether the acquired operating information (engine speed) is equal to or smaller than the judgment value V Ju The control unit 11 determines whether the operation information is equal to or greater than the determination value V Ju (500 rpm) or more, the control unit 11 determines that the prime mover 21 is in operation. Ju If it is determined that the time is not equal to or greater than the predetermined time, it is determined that prime mover 21 is not in an operating state. Note that control unit 11 executes the process of determining the operating state according to the clock cycle. Note that in this embodiment, since the clock cycle is shorter than the communication cycle of prime mover control unit 22, control unit 11 executes the process of determining the operating state based on the immediately preceding operating information until new operating information is acquired. The same applies to the control process for each clock cycle below.

[0042] (4. Addition of operating hours) When the control unit 11 determines in the above-mentioned determination process that the prime mover 21 is in operation, the control unit 11 adds the clock period (1 s) of the timer unit 13 to the stored time T me and correction time T cr (Measurement time T ms ) during one operation period of the work machine 1. ad The cumulative value of the actual operation time T ac It may be indicated as follows.

[0043] (5. Calculation of measurement time) In the calculation process of the measured time, the control unit 11 calculates the stored time T me , correction time T cr and actual operation time T ac (The cumulative value of the added time) is used to measure the time T ms In the example shown in FIG. me is 60s, and the correction time T cr is 30s, and the actual operating time T ac Since the measurement time is 110s, T ms would be 200s.

[0044] (6. Write Determination Process) In the write determination process, the control unit 11 measures the measurement time T ms and the threshold time T th Based on the threshold time T th is the measurement time T ms is the threshold value for judging whether writing is possible or not. th is set for each fixed value, and the memory time T me In the example shown in FIG. 3, a value of one of the threshold times T th is set every 60 seconds (T th1 =60s,T th2 =120s,T th3 =180s,T th4 =240s,T th5 =300s,T th6 = 360s), and the storage time during measurement processing Tme If is 120s, the threshold time T th is the threshold time T th3 In the example shown in FIG. 1, the control unit 11 determines the measurement time T ms (200s) is the threshold time T th3 (180 s) or more, and determines that writing is possible. ms is the threshold time T th If it is determined that the amount is not equal to or greater than the limit, it is determined that writing is not possible.

[0045] (7. Write process) When the control unit 11 determines that writing is possible, the threshold time T th Write time T re In addition, when the control unit 11 executes the writing process, the control unit 11 stores the threshold time T th In the example of FIG. 3, the control unit 11 transitions the threshold time T th3 (180s) is the writing time T re Then, the write process is performed for the threshold time T th The threshold time T th3 (180s) to threshold time T th4 Transition to (240s).

[0046] The control unit 11 repeatedly executes the above-mentioned measurement process every clock cycle (1 s) until the key switch 50 receives a stop operation (key-off operation) by the operator.

[0047] When the key switch 50 receives an operation (key-off operation) from the operator, the control unit 11 stops the measurement process and updates the last operating time (180 s) stored in the long-term storage area to the storage time T me It becomes.

[0048] As described above, in the operating time measurement device 10 of the present embodiment, the actual operating time T ac Correction time T cr By adding, it becomes possible to reduce the increase in measurement error that occurs in each writing process with a certain probability.

[0049] In an operating time measurement device that can measure and store operating time only when a work machine is operating, the fractional part that is truncated during the writing process generally becomes a measurement error, as shown in Figs. 4 and 5, and this measurement error increases with each writing process. Specifically, as shown in Fig. 4, in one measurement, the difference (30 s) between the actual operating time (90 s) and the measured operating time (60 s) becomes the measurement error. In the next measurement, as shown in Fig. 5, the difference (30 s) between the actual operating time (200 s) and the measured time T ms The difference (80 s) between the actual time (120 s) is the measurement error. In this way, the measurement error increases from 30 s to 80 s depending on the number of measurements. If the measurement error exceeds the allowable value, it will cause problems when presenting the operating time to the operator.

[0050] On the other hand, in the operating time measurement device 10 of the present embodiment, the correction time T cr Since the measurement is performed while taking into account the above, positive and negative error regions can occur as shown in Figure 6. However, except in cases where the occurrence of error is biased towards either the positive error or the negative error, the positive and negative errors cancel each other out, preventing the error from becoming unilaterally large. This prevents the measurement error from exceeding the allowable value with a certain probability.

[0051] In addition, in the operating time measurement device 10 of this embodiment, the correction time T cr Let T be the threshold time. th Specifically, the correction time T cr The threshold time T th (For example, the threshold time T th1 (60s) and threshold time T th2 This makes the probability of a positive error occurring equal to the probability of a negative error occurring, preventing the occurrence of errors from being biased toward either positive or negative. In this way, in the operating time measurement device 10 of the present embodiment, the measurement error is prevented from becoming so large that it causes a hindrance when presenting the operating time to the operator.

[0052] (8. Setting process) Next, during the start-up process of the work machine 1, the memory time T me Correction time T added to cr The process of setting the correction time T will be described with reference to Fig. 2. After the operator activates the display device 30 by turning on the key, a display setting screen is displayed on the display unit 31 by operating the operation unit 32 (Fig. 2). On the display setting screen, the setting contents are displayed in the setting content display area 31b (31b1 to 31b8), and the operator can operate the operation unit 32 according to the operation content display area 31c (31c1 to 31c6). In the example of Fig. 2, the correction time T cr In this state, by operating the operator corresponding to "OK (31c6)", the correction time T cr In this way, the correction time T cr Since the value of can be changed, the threshold time T th and correction time T cr This allows the ratio of the correction time T cr This makes it possible to set the above, thereby improving the probability that the above-mentioned errors 1 and 2 can be offset.

[0053] [3. Control process flow of the operating time measurement device 10] Next, an example of the flow of control processing of the operating time measurement device 10 having the above-mentioned configuration will be described.

[0054] (Processing of the prime mover control unit 22) 7 is a flowchart showing the flow of basic processing of the power unit 20. As shown in the figure, when the key switch 50 accepts an operation by the operator, the prime mover control unit 22 determines that the operating state of the work machine 1 is an engine start state, and executes start-up processing of the prime mover 21 (step S101). When this processing is completed, the process proceeds to step S102.

[0055] Next, in step S102, prime mover control section 22 executes an operation information acquisition process, and acquires engine speed information as operation information of prime mover 21. When this process is completed, the process proceeds to step S103.

[0056] Next, in step S103, prime mover control section 22 executes an operation information output process. In this process, prime mover control section 22 outputs operation information of prime mover 21 to control section 11. When this process is completed, the process proceeds to step S104.

[0057] Next, in step S104, the prime mover control section 22 executes a process for determining the operating state of the work machine 1. In this process, if the prime mover control section 22 determines that the key is off (S105: Yes), the series of processes ends. On the other hand, if the prime mover control section 22 determines that the key is not off (S105: No), the process proceeds to step S103.

[0058] In this manner, in power plant 20, when the engine starts up and until the key is turned off, prime mover control section 22 starts prime mover 21 and acquires operation information, and outputs this operation information to control section 11 at communication intervals.

[0059] (Processing of control unit 11) Next, the flow of the measurement process executed by the control unit 11 of the operating time measurement device 10 will be described with reference to Fig. 8. Fig. 8 is a flowchart showing the flow of the measurement process of the control unit 11.

[0060] As shown in the figure, when the key switch 50 receives a key-on operation by the operator, the control unit 11 is started and executes a read process in the start process (step S201). In this read process, the control unit 11 reads the operating time (storage time T me ) is read into a temporary storage area. When this process is completed, the process proceeds to step S202.

[0061] Next, in step S202, the control unit 11 executes a correction process in the start process. In this correction process, the control unit 11 reads out the stored time T me Then, the correction time T cr The readout process and the correction process complete the start process. When this process is completed, the process proceeds to step S203.

[0062] Next, in step S203, control unit 11 executes an operation information acquisition process. In this process, control unit 11 acquires the operation information output by prime mover control unit 22. When this process is completed, the process proceeds to step S204.

[0063] Next, in step S204, the control unit 11 executes a process for determining the operating state. In this process, the control unit 11 determines whether the operating information (engine speed) of the prime mover 21 is equal to or greater than the determination value V Ju It is determined whether or not it is equal to or greater than this.

[0064] The control unit 11 determines whether the operation information of the prime mover 21 is a judgment value V Ju If it is determined that the operating information of the prime mover 21 is equal to or greater than the determination value V (S205: Yes), the control unit 11 determines that the prime mover 21 is in an operating state, and the process proceeds to step S206. Ju If it is determined that the time is not greater than the predetermined time (S205: No), it is determined that prime mover 21 is not in operation, and the process proceeds to step S203.

[0065] Next, in step S206, the control unit 11 executes an addition process of the operation time. In this process, the control unit 11 adds the stored time T me and correction time T cr Add time T ad (clock period) is added. When this process is completed, the process proceeds to step S207.

[0066] Next, in step S207, the control unit 11 executes a write determination process. ms (memory time Tme , correction time T cr and the addition time T ad The sum of the threshold time T th The control unit 11 determines whether the measurement time T ms is the threshold time T th If it is determined that the measured time T ms is the threshold time T th If it is determined that the number is not greater than the limit (S208: No), the process proceeds to step S203.

[0067] Next, in step S209, the control unit 11 executes a write process. In this process, the control unit 11 th Write time T re After the write process, the control unit 11 writes the threshold time T th When this process is completed, the process proceeds to step S210.

[0068] Next, in step S210, the control unit 11 determines whether to perform processing to determine the operating state of the work machine 1. If the control unit 11 determines that the key is off (S211: Yes), the control unit 11 ends the series of processing. On the other hand, if the control unit 11 determines that the key is not off (S211: No), the control unit 11 proceeds to step S203.

[0069] In this way, in the operating time measurement device 10, from when the engine is started until the key is turned off, the control unit 11 executes the measurement process for each clock cycle while the work machine 1 is operating, and records the measurement time T ms is the threshold time T th When this occurs, the write process is executed.

[0070] [Variation 1] Next, a modified example of the operating time measurement device according to the present embodiment will be described. As shown in FIG. 9, an operating time measurement device 10a according to this modified example has some configuration in common with the above-described measurement device 10. Therefore, only the different configurations will be described, and the common configurations will be denoted by the same reference numerals and will not be described.

[0071] The control unit 11a, like the control unit 11 described above, is configured, for example, by an electronic control unit (ECU), reads a program stored in the long-term storage area of ​​the storage unit 12, functions as the measuring device 10a, and executes measurement processing.

[0072] The memory unit 12a is configured with a storage device that stores predetermined information related to the measurement processing of the measuring device 10a, similar to the memory unit 12 described above. The memory unit 12a has a long-term storage area and a temporary storage area therein. The long-term storage area is configured with a non-volatile memory such as a ROM. The temporary storage area is configured with a volatile memory such as a RAM. The information stored in the long-term storage area of ​​the memory unit 12a includes the programs, operation time, and judgment value V stored in the memory unit 12. Ju and the threshold time T th In addition, a counter indicating the number of write processes executed by the control unit 11 is stored.

[0073] Next, the control process of the operating time measurement device 10a will be described. The control unit 11a executes the same control processes as the control unit 11 as the measurement processes, but adds “1. Start-up process”, “2. Operation information acquisition process”, “3. Operation state determination process”, “4. Operation time addition process”, and “5. Measurement time T ms "Calculation process of" is common to the control process by the control unit 11 described above, so "6. Write determination process" and "7. Write process" which are different from the control process described above will be described below with reference to Fig. 10. Fig. 10 is a diagram showing the control process of a measuring device 10a according to a modified example, and corresponds to the control process of the measuring device 10 shown in Fig. 3.

[0074] As shown in FIG. 10, the measurement device 10a detects a threshold time T th A fixed value (e.g., 60 s) is set as the measurement time Tms is the threshold time T th When the write process is completed, the measured time T ms is reset, and the value of the counter indicating the number of write processes is incremented by 1. In the example of FIG. ms Since the time is 20 s and the counter is 4, it is shown that four write processes have been executed and 20 s has passed since the last write process.

[0075] Next, an example of the flow of control processing of the operating time measurement device 10a will be described. Note that the processing of the prime mover control unit 22 is omitted since it is the same as that described in Fig. 7 above. Fig. 11 is a flowchart showing the flow of the measurement processing of the control unit 11a.

[0076] As shown in the figure, when the key switch 50 receives a key-on operation by the operator, the control unit 11a starts up and executes a read process in the start-up process (step S201). When this process is completed, the process proceeds to step S202.

[0077] Next, in step S202, the control unit 11a executes a correction process in the start process. When this process is completed, the process proceeds to step S203.

[0078] Next, in step S203, the control unit 11a executes an operation information acquisition process, and when this process is completed, the process proceeds to step S204.

[0079] Next, in step S204, the control unit 11a executes an operating state determination process. The control unit 11a determines whether the operation information of the prime mover 21 is a judgment value V Ju If it is determined that the operation information of the prime mover 21 is equal to or greater than the determination value V (S205: Yes), the process proceeds to step S206. Ju If it is determined that the number is not greater than the limit (S205: No), the process proceeds to step S203.

[0080] Next, in step S206, the control unit 11a executes an addition process of the operating time. When this process is completed, the process proceeds to step S221.

[0081] Next, in step S221, the control unit 11a executes a write determination process. ms is the threshold time T th The control unit 11a determines whether the measurement time T ms is the threshold time T th If it is determined that the measured time T ms is the threshold time T th If it is determined that the measured time T ms (20s) is the threshold time T th (60 s), the control unit 11a measures the measurement time T ms is the threshold time T th It is determined that the value is not greater than the threshold value.

[0082] Next, in step S223, the control unit 11a executes a write process. In this process, the control unit 11a th Write time T re The control unit 11a writes the data in the long-term storage area of ​​the storage unit 12a as the write time T re After writing to the memory unit 12a, the measurement time T ms Therefore, the measurement time T ms becomes 0s. When this process is completed, the process proceeds to step S224.

[0083] Next, in step S224, the control unit 11a executes a counting process. In this process, the control unit 11a The counter value stored in the memory area is incremented by 1. When this process is completed, the process proceeds to step S210.

[0084] Next, in step S210, the control unit 11a determines whether to perform processing to determine the operating state of the work machine 1. If the control unit 11a determines that the key is off (S211: Yes), the control unit 11a ends the series of processing. On the other hand, if the control unit 11a determines that the key is not off (S211: No), the control unit 11a proceeds to step S203.

[0085] In this manner, in the operating time measurement device 10a, from when the engine is started until the key is turned off, the control unit 11a executes the measurement process at clock intervals and keeps counting the measurement time T ms is the threshold time T th When this occurs, the write process is executed.

[0086] As described above, the operating time measurement device 10a can execute the measurement process in the same manner as the above-described measurement device 10. In the measurement device 10a, in particular, the memory unit 12a stores a counter indicating the number of write processes, and the control unit 11a executes a count process for each write process, so that the number of writes can be easily grasped by the counter. [Industrial Applicability]

[0087] The present invention can measure and store the operating time of a work machine. [Explanation of symbols]

[0088] 1. Work machine (hydraulic excavator) 10,10a Operating time measuring device 11, 11a Control section 12 Storage section 13 Timing section 20 Power plant 21 Prime mover (engine) 22 Prime mover control section 30 Display device 31 Display section 32 Operation section 40 Energy storage device (battery) 50 Key Switches 61 Signal Line 62 Feed line T ac Actual operation time (measurement time) T ad Addition time T cr Correction Time T me Memory time (read time) T ms Measurement time T re Write Time T th Threshold Time V Ju Judgment value

Claims

1. A step in which a measurement unit measures an operating time of the work machine; A step of calculating a storage time to be stored in a storage unit by a control unit based on the operating time; having The control unit calculates a measurement time by adding a correction time to the operating time, An operating time measurement method, comprising: calculating the stored time based on the measured time.

2. The operating time measurement method described in Claim 1, characterized in that the control unit calculates the memory time based on the measurement time and a judgment threshold value.

3. The operating time measurement method described in Claim 2, characterized in that when the measurement time is greater than or equal to the judgment threshold, the control unit calculates the judgment threshold as the stored time.

4. The judgment threshold value is provided in a plurality of predetermined values, 4. The operating time measurement device according to claim 3, wherein the control unit, when calculating the determination threshold as the stored time, transitions the determination threshold to a larger value.

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