JP2557684B2 - Maintenance monitor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a maintenance monitor that informs an operator of the replacement time of oils and oils, parts and the like that need to be replaced in various machines such as construction machines. Regarding the device.

[Conventional technology]

A device for alarming when to replace a filter on a construction machine
59-109628.

In the device of the present invention, the timer is reset to zero when the filter for the fluid such as oil and fat used in the construction machine is replaced, the usage time after the replacement is measured thereafter, and the measurement result can be displayed. Informs the operator of the filter usage time.

Then, when the detected usage time reaches the set replacement time, an alarm is issued to notify the operator of the replacement of the filter.

[Problems to be Solved by the Invention]

Thus, in the past, although the filter usage time is displayed, the difference (remaining time) between the replacement time set in the filter and the current usage time of the filter can be directly grasped with only such information. However, since the operator cannot quickly know the information such as "how much time is left until the replacement time", the operator often misses the replacement time.

The present invention has been made in view of the above circumstances, and a common problem to be solved is to display the remaining time until the replacement time to eliminate the above-mentioned inconvenience.

A large number of consumable parts are used in construction machinery, but since they also include parts that are important for safety, it is necessary to accurately manage the replacement time of these consumable parts to ensure proper replacement. Replacing parts at the time of replacement is required to ensure safety.

However, the maintenance monitor itself that manages the replacement time may fail.

Here, at the time of the failure, there is no problem if the remaining time until the replacement of consumable parts is displayed, but the display itself may disappear. In such a case, even if the module is replaced with a new module, the remaining time is unknown, so the display contents are initially set to the replacement time, and the subtraction is started from this initially set replacement time. Sometimes. For this reason, the consumable parts will not be replaced even after the original replacement time, and the safety of the construction machine may be impaired.

The invention according to claim 1 has been made in view of the above circumstances, and even when the module has to be replaced due to a failure of the maintenance monitor itself, the consumable part is replaced at the time of the failure. The problem to be solved is to improve the safety of the machine by enabling the subtraction to be started from the remaining time until.

Also, in construction machinery, there are many consumable parts,
The replacement time differs for each part. Therefore, it is an undue burden on the operator to manually reset the replacement time every time a large number of these parts are replaced.
In addition, there is no problem if the replacement time is reset corresponding to the replaced part, but there may be a mistake that the replacement time is reset corresponding to a part in use different from the replaced part. .

In such a case, the consumable parts will not be replaced even after the original replacement time, which may impair the safety of the construction machine.

The invention according to claim 2 is made in view of such a situation, and even if the machine has to replace a large number of consumable parts, the replacement time is automatically reset corresponding to the replaced parts. Therefore, it is an object of the invention to reduce the work load on the operator and improve the safety of the machine.

[Means and Actions for Solving the Problems]

Therefore, in the first invention of the present invention, an operation detecting means for detecting whether or not the machine is operating, a timer for measuring the time during which the machine is operating based on the output of the operation detecting means, and a replacement part for the machine An exchange time setting means for setting the exchange time, a subtracting means for subtracting the time measured by the timer from the exchange time set by the exchange time setting means, and a display section for displaying the output of the subtracting means. In addition to the provided module, an external storage device for storing the subtraction time of the subtraction means is provided outside the module, and when the module is replaced, the subtraction time stored in the external storage device is stored in the module after the replacement. In the subtraction means of the module after the replacement, the subtraction is restarted from the subtraction time stored in the external storage device.

According to the first aspect of the present invention, when the maintenance monitor itself fails or the module is replaced, the subtraction is started from the remaining time until the replacement of the consumable part at the time of the failure. For this reason, the safety of the machine which must replace the maintenance monitor device itself is dramatically improved.

According to a second aspect of the present invention, operation detecting means for detecting whether or not the machine is operating, a timer for measuring the time during which the machine is operating based on the output of the operation detecting means, and a replacement part for the machine. Exchange time setting means for setting the exchange time, subtraction means for subtracting the time measured by the timer from the exchange time set by the exchange time setting means, and a display section for displaying the output of the subtraction means, Replacement detection means for detecting that the replacement part has been replaced, and reset means for resetting the display of the display unit to the replacement time when the replacement detection means detects that the replacement part has been replaced. And when the reset means resets, the current subtraction time in the subtraction means is replaced with the exchange time, and the subtraction is restarted from the exchange time. So that comprises a means for.

According to the second aspect of the invention, the replacement time is automatically reset corresponding to the replaced part, and the subtraction is started from the reset replacement time. Therefore, in a machine in which a large number of consumable parts must be replaced, the work load on the operator is dramatically reduced, and the safety of the machine is dramatically improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an appearance of an apparatus of an embodiment of a maintenance monitor apparatus according to the present invention.

As shown in FIG. 2, the maintenance monitor device 1 shown in the figure has an electronic circuit 6 to be described later, a liquid crystal 7 is mounted on a substrate 2a, and various switches SW1 to SW6 are arranged so as to project. For the module 2, the liquid crystal 7
Appears on the outside and the above switches SW1 to SW6
Among them, the switches SW1 to SW4 are pushed from the outside, the acrylic plate 3, the case 4, the polyester film 5
The device 1 is mounted inside an operation cab of a construction vehicle such as a dump truck.

That is, when the maintenance monitor device 1 is mounted in the operation cab, its appearance is
As shown in the figure, it is roughly composed of a display section 8 for performing various displays by the liquid crystal 7, and switches SW1 to SW4 for instructing various displays on the display section 8.

FIG. 7 is a sectional view showing an AA section of FIG. 1.
As shown in the figure, the switches SW1 to SW4 are a group of switches that can be pushed from the outside via the polyester film 5 as described above, and the switches SW5 and SW6 have an acrylic plate 3 and a case on the upper part thereof. 4 is positioned and constitutes a hidden switch group which cannot be pushed from the outside when mounted as shown in FIG.

The switch SW1 is used to display the oil change instruction display 8a, 8a on the display unit 8.
Arrows 8a ′, 8b ′, 8 corresponding to b, 8c, 8d and 8e, respectively
A switch for illuminating and displaying c ′, 8d ′, and 8e ′. Each time the switch SW1 is pressed, it starts from arrow 8a ′ and sequentially illuminates and displays 8b ′, 8c ′, 8d ′, and 8e ′. Is repeated.

Similarly, the switch SW4 is provided with an arrow 8 corresponding to each of the filter replacement instruction displays 8f, 8g, 8h, 8i and 8j on the display unit 8.
This is a switch to light up and display f ′, 8g ′, 8h ′, 8i ′ and 8j ′, and the arrow 8
Starting from f ', the display of 8g', 8h ', 8i' and 8j 'is repeated in sequence.

Here, the oil change instruction displays 8a to 8e are, for example,
8a corresponds to each of the engine oils used in the dump truck, and corresponds to each of the five types of oil used in the dump truck.
Further, the filter replacement instruction displays 8f to 8j are, for example, 8f,
It corresponds to each of the five types of filters used in the dump trucks, as well as the engine oil filters used in the dump trucks. The replacement time display 8k is the oil replacement instruction display 8a to 8e. Alternatively, one of the oil replacement instruction displays 8a to 8e or the filter replacement instruction displays 8f to 8j corresponding to the arrow that is lit by operating the switch SW1 or SW4 among the filter replacement instruction displays 8f to 8j Or the remaining time obtained by subtracting the used time of the oil or filter from the replacement time set for the filter is displayed in 4 digits in units of hours. If the used time does not reach the replacement time, the remaining time is displayed. Is displayed as a plus and the above usage time exceeds the above replacement time, -1, -2,
As the negative time is displayed like ...
The number displayed as a warning to alert the operator to the replacement is flashed.

When the remaining time is positive, no display is made on the oil change instruction displays 8a to 8e or the filter change instruction displays 8f to 8j, but when the remaining time becomes zero or negative, A corresponding alarm is lit and displayed as an alarm for instructing replacement.

The switch SW2 (set switch 4) is a switch for setting the display of the replacement time display 8k to the replacement time which is the initial value. For example, when the oil or the filter is replaced, the switch SW2 is pushed. Then, the corresponding replacement time of the oil or filter, which is lit by the arrows 8a ′ to 8j ′, is displayed as the replacement time display 8k.
Is displayed in.

The switch SW3 (cancel switch) is a switch that cancels the exchange time set by the switch SW2 and resets the exchange time display 8k to the number before being set by the switch SW2.

The switches SW2 and SW3 are switches that function as described above only when the engine is not operating.

The switches SW1, SW2, SW3 and SW4 also function as set switches for manually setting the replacement time.

As described above, the switches SW5 and SW6 cannot be operated directly by the operator in the monitor assembly state shown in FIG. 2, but when the module 2 breaks down and the service person replaces it, the replacement time This is a switch that can be used for manual settings.

The switch SW5 is a switch having the same function as the switches SW1 and SW4 at the time of this manual setting,
Each time the switch SW5 is pressed, the display starts repeatedly from the arrow 8a 'to the arrow 8j' and is repeatedly lit up, and the replacement time display 8k shows the current time (remaining time) of the corresponding oil or filter. It

The switch SW6 is a switch for manually setting the replacement time, and the replacement time can be manually set only while the switch SW6 is being pushed.

In this case, the switches SW1, SW2, SW3 and SW4 set the 4th digit, 3rd digit, 2nd digit and 1st digit of the replacement time display 8k respectively while the switch SW6 is being pushed. Function as a switch. That is, each time the switches SW1 to SW4 are pressed, the current digit of the corresponding digit repeatedly changes by one. In addition, at the time of this manual setting, the plus or minus sign of the replacement time display 8k is repeatedly displayed ± inverted every time the displayed number becomes zero.

The input circuit of the switches SW1 to SW6 to the CPU19, which will be described later, is as shown in FIG. 8. The input circuit outputs a signal of logical "0" level via the CR circuit 9 when each switch is pushed. Is input to the CPU 19 and each switch is not pressed, the logic “1” is input via the CR circuit 9.
Each level signal is input to the CPU.

Now, as shown in FIG. 4, in the oil pan 10 of the engine of the dump truck, in addition to the normal oil amount level sensor 12 for detecting whether or not the engine oil 11 is sufficient, Engine oil near the bottom of 10
An oil amount level sensor 13 is provided for detecting whether 11 has been discharged by replacement.

The level sensor 13 has a fifth level when the oil level of the engine oil 11 is higher than the position of the sensor 13.
As shown in the figure, the contacts 13a, 13b are separated from each other and opened, and it is detected that the oil is not changed and the normal state is detected. If the oil level drops below the position of the sensor 13 by discharging the oil, a normally open sensor that detects that oil has been changed by connecting the contacts 13a and 13b to the closed state. is there.

By using such a normally open type sensor, even if the engine oil 11 is sufficiently in the oil pan 10 as in the case of using a normally closed type sensor, the signal line 13c is disconnected. The open state will not be detected by mistake.

By the way, the instruction to change the engine oil 11 is given by the lighting display of the oil change instruction display 8a.
A sensor 13 similar to the sensor 13 is also provided in each oil pan (tank) of oil (that is, mission oil, hydraulic oil, etc.) corresponding to each of the other oil exchange instruction displays 8b to 8e.

Similarly, as shown in FIG. 6, the level sensor 1 is provided in the recess 15a of the mounting seat surface 15 of the engine oil filter 14.
Similar to 3, when the filter 14 is arranged on the mounting seat surface 15, it is detected that the contact is in an open state and the filter is in a normal state without replacement, while the filter 14 is If removed from the mounting seat surface 15,
A normally open type limit switch 16 for detecting that the contact is closed and the filter is replaced is provided.

By the way, the instruction to replace the oil filter 14 is given by turning on the filter replacement instruction display 8f. Limit switches 16 similar to the above limit switches 16 are also provided on the mounting surfaces of the filters corresponding to the other filter replacement instruction displays 8g to 8j.

FIG. 3 is a hardware block diagram conceptually showing the electronic circuit 6 incorporated in the module 2.

In the figure, the power supply 17 is an electric wire for applying a voltage of 5V to the electronic circuit 6 by DC-DC conversion from a vehicle-mounted battery (24V) of a dump truck.

The analog input port 18 is an input port of the CPU 19 into which a detection signal (analog signal) of a sensor (not shown) that detects the oil pressure of engine oil is converted into a digital signal by an A / D converter and input.

The on / off input port 20 is an input port of the CPU 19 to which the oil level sensor 13 and the limit switch 16 are connected and a detection signal (digital signal) is input.

The switch input port 21 outputs the output signal of the input circuit.
The reset circuit 22, which is an input port of the CPU 19 and is input to the CPU 19, is a circuit that resets the CPU 19 to the initial state when the power supply 17 is turned on.

The oscillator circuit 23 is a circuit that generates an operation clock of the CPU 19.

The serial output switching unit 24 selects and adds data output from the CPU 19 to the liquid crystal driver 25 or the serial input / output port 26.

The liquid crystal driver 25 is a drive circuit that is connected to the liquid crystal 7 and inputs a signal to the liquid crystal 7 to drive the liquid crystal 7 based on the output of the serial output switching unit 24.

The serial input / output port 26 is connected to an external storage device (for example, an IC card reader or a personal computer is used) 27 via an interface of RS-232C standard, and serial data communication is performed between the CPU 19 and the external storage device 27. It is an input / output port of the CPU 19 for performing.

The RS-232C serial data communication is full-duplex asynchronous communication. For example, the signal string has a bit length of 1 bit for the start code, 1 bit for the stop code, and 11 bits for the data string. And transfer is 12
It is performed at a rate of 00 bits / second.

The external alarm output port 28 is an output port of the CPU 10 that is connected to an external alarm device (not shown) and inputs an alarm signal output from the CPU 19 to the alarm device.

The non-volatile RAM 29, which is a replacement time setting means, is a memory of the CPU 19 for inputting / outputting data to / from the CPU 19. The RAM 29 previously stores the five kinds of oil and the five kinds of filters, respectively. Exchange time is stored.

Next, a processing procedure executed by the CPU 19 will be described with reference to FIGS. 9 to 11.

As shown in FIG. 9, when the electronic circuit 6 is powered on by the power source 17, the reset circuit 22 resets the CPU 19 to the initial state (step 101).

Next, data is loaded from the non-volatile RAM 29 (step 102), and it is determined whether or not serial transmission / reception is performed (step 103).

If it is determined to be transmitted in step 103,
Serial output switching unit 24, serial input / output port 26, RS-
Data is serially transmitted to the external storage device 27 via the 232C and stored in the storage device 27 (step 10).
Four). If it is determined to be received in step 103, data is added to the CPU 19 via the external storage device 27, RS-232C, and serial input / output port 26 (step 105). If the decision result in the step 103 is NO, the procedure moves to the step 106.

At step 106, on / off signal input processing is executed.

FIG. 10 is a flowchart showing in detail the processing procedure of this on / off signal processing (step 106).

That is, it is determined whether or not the engine is operating based on the detection result of the oil pressure sensor as the operation detecting means for detecting the oil pressure of the engine oil. For example, the threshold value is set to 1 Kg / cm ² in advance, and if the detection value of the hydraulic pressure sensor exceeds this threshold value, it is determined that the engine is running, and the detection value is If the value is lower than the threshold value, it is determined that the engine is not running (step 107).

Next, it is judged whether or not a closing signal is output from the oil amount level sensor 13 or the limit switch 16 which is the replacement detecting means, that is, whether the oil or the filter is replaced (step 108).

If the result of the determination in step 108 is NO, that is, if the replacement of the oil or the filter is not detected, the procedure proceeds to next step 109.

In step 109, it is determined whether or not the switch SW2 (set switch) has been pushed, that is, whether or not the switch SW2 has been pushed due to replacement of oil or a filter.

If the determination result in step 109 is YES, or if the determination result in step 108 is YES, the procedure proceeds to step 110.

In step 110, the level sensor in step 108
13 or the current remaining time of the corresponding oil or filter for which a closing signal is input from the limit switch 16, that is, the change time that is the initial value of the set change time minus the time when these oil or filter are used The reset process to set to is executed. That is, CPU1
9 has reset means. Or step 109
If the switch SW2 (set switch) is pushed in, the current remaining time of the oil or filter of the item indicated by pushing the switch SW1 or the switch SW4 is set to the replacement time which is the initial value. Processing is performed.

Next, it is determined whether or not the switch SW3 (cancel switch) is pushed (step 111), and the same step 111
If the result of the determination is YES, a process of resetting the initial value (replacement time) of the remaining time set in step 110 to the remaining time before the setting is executed (step 11
2), the procedure moves to step 113 in FIG.

If the determination result in step 107 is YES, that is, if it is determined that the engine has started, or in step 10
If the judgment result of 9 is NO, that is, if the switch SW2 (set switch) is not pressed, or step 11
If the result of the determination at 1 is NO, that is, if the switch SW3 (cancel switch) is not pushed, the procedure proceeds to step 113 in FIG.

 A detailed flowchart of step 113 is shown in FIG.

That is, as shown in FIG.
It is determined whether or not 6 is pushed, that is, whether or not the replacement time is manually set (step 114).
If the determination result in step 114 is YES, the switch SW
4, that is, it is determined whether or not the setting switch at the first digit of the replacement time at the manual setting is pushed (step 115). If the determination result in step 115 is YES, that is, if the switch SW4 is pressed, a process of adding +1 to the digit display is executed (step 116).

Specifically, as shown in FIG.
27 processes are executed. That is, +1 is added to the digit number (step 123), it is determined whether or not the number has reached 10 (step 124), and the determination result of the step 124 is YE.
If it is S, set the digit of that digit to 0 (Step 1
twenty five). Then, it is determined whether or not all the numbers of each digit (first to fourth digits) are set to 0, that is, the exchange time is set to 0 (step 126). If the decision result in the step 126 is YES, a process of inverting the ± sign of the exchange time with respect to the current ± sign is executed (step 127). Then, the procedure moves to the next step 117. Note that step 124
If the result of the determination is NO, that is, if the digit in that digit is not 10, or if the result of the determination in step 126 is NO, that is, if the replacement time is not 0, the procedure is
Moved to 117.

Below, step 117, step 118 and step 11
Also in 9, step 120, step 121, and step 122, the processing of the second digit, the third digit, and the fourth digit of the replacement time is executed by the same procedure as the processing of step 115 and step 116, respectively, and the procedure is as follows. Step 128 is executed. If it is determined in step 114 that the switch SW6 has not been pushed, that is, if it is determined that the manual setting of the replacement time is not performed, the process similarly proceeds to the next step 128. Note that the above steps 114 to 127
The process (1) is performed on the oil or filter of the item designated by pushing the switch 5.

In step 128, it is determined whether or not the engine is operating, in the same manner as the processing of step 107 above.

If the result of the determination in step 128 is YES, that is, if it is determined that the engine is operating, a timer (not shown) starts and the five items of oil and 5
For each of the item filters, a process of subtracting the time measured by the timer from the set exchange time and calculating the remaining time until the exchange time is executed. That is, the CPU 19 has subtraction means (step 129).

Next, it is judged whether or not the time measured by the timer, that is, the usage time of each oil and each filter has passed one minute (step 130), and the judgment result of the step 130 is YES.
In the case of, that is, when the above timer has elapsed for 1 minute,
A process of storing the remaining time calculated in step 129 in the nonvolatile RAM 29 is executed. In other words, the non-volatile RAM 29 sequentially stores the remaining time of each oil and each filter when the timer measures one minute.

Then, in the next step 132, it is determined whether or not the remaining time of each oil and each filter is one hour after the replacement time, which is the initial value, in sequence, and the liquid crystal 7 is determined every one hour. The data processing for displaying is displayed.

For example, when the replacement time of the engine oil 11 is set to 100 hours, this data processing is executed every hour, and the liquid crystal 7 (replacement time display 8k) displays +99, +98,
When the remaining time becomes 0, -1, and -2 while the data for displaying ... is created, this number is displayed by blinking on the liquid crystal 7 (replacement time display 8k). Data is created.

If the remaining time becomes negative, such as -1, -2, ..., the data to display the oil replacement instruction display 8a-8e or filter replacement instruction display 8f-8j for the corresponding oil or filter is displayed. Created.

Next, the display data created in step 132 is transferred to the liquid crystal driver 25, and the process of displaying the liquid crystal 7 is executed.

That is, for the oil or filter of the item set by pushing the switch SW1 or SW4,
The current remaining time is displayed on the replacement time display 8k, and for the oil and filter for which the remaining time is negative, the oil replacement instruction displays 8a to 8e and the filter replacement instruction displays 8f to 8j are lit up. (Step 133).

As described above, according to this embodiment, the following advantages can be obtained.

(1) For each of the 5 items of oil and the 5 items of filter, the remaining time until the replacement time is displayed, so that information "how much time is left before the replacement time" can be quickly obtained. , The replacement time will not be missed.

(2) When the remaining time becomes negative, it blinks and is displayed, so that information that the replacement time has passed can be reliably obtained.

(3) It is possible to manually set the replacement time for each of the five items of oil and the five items of filter.
Therefore, even when the electronic circuit 6, the liquid crystal 7 or the like fails and the module 2 is replaced, it is possible to set the data before the replacement by performing the manual setting.

(4) It has a RS-232C standard serial transfer function and can store data in the external storage device 27 and receive data from the external storage device 27.

That is, similarly to the above (3), even when the module 2 is replaced due to a failure, the data before the replacement, that is, the data such as the remaining time of each oil and the filter before the replacement can be used. .

(5) When the oil or the filter has been replaced, the current remaining time and the initial replacement time can be automatically reset. (Note that this reset can also be manually performed by the operator.) In the embodiment, it is determined that the engine is operating based on the detection result of the hydraulic pressure sensor. It is also possible to make a judgment by detecting. In any case, the type and arrangement of the sensors are arbitrary as long as it can detect that the engine is operating.

In the embodiment, the oil amount level sensor 13 is provided for each of the five types of oil, and the limit switch 16 is provided for each of the five types of filters.
It is also possible to automatically set the replacement time by arranging the switch SW2 and automatically resetting the replacement time, while not setting the limit switch 16 on the filter manually.

Further, in the embodiment, the maintenance monitor device 1 is arranged as an independent device in the operator room of the dump truck, but the function of the maintenance monitor 1 is a normal monitoring system, that is, the radiator water level, the engine water temperature, the engine. Of course, it is also possible to implement it by incorporating it into a system having a check function such as preheating, battery charge check, caution, and gauge function. In this case, the condition of each part of the vehicle body is displayed on the same monitor panel, and the display content of the display unit 8 is displayed.

In addition, in the embodiment, the application target of the maintenance monitor device 1 is a construction vehicle such as a dump truck,
Without being limited to this, the present invention can be applied and implemented as long as the machine requires replacement parts to be regularly replaced.

In the embodiments, the present invention has been illustrated as an apparatus used for maintenance of oil and filter replacement, but the present invention is not limited to this, and the present invention can be used for maintenance of parts that require periodical replacement. Of course, it can be configured and used as a device for use.

〔The invention's effect〕

As described above, according to the present invention, since the remaining time until the replacement time of the component that needs to be replaced is displayed, it is possible to replace the component without delay. . Further, according to the present invention, when the maintenance monitor itself fails or the module is replaced, the subtraction is started from the remaining time until the replacement of the consumable parts at the time of the failure, etc. The safety of machines that must replace the device itself is dramatically improved.

Further, according to the present invention, the replacement time is automatically reset corresponding to the replaced part, and the subtraction is started from the reset replacement time. Therefore, many consumable parts must be replaced. In the machine which cannot obtain, the work burden on the operator is dramatically reduced and
The safety of the machine is dramatically improved.

[Brief description of drawings]

FIG. 1 is a front view showing the external appearance of an embodiment of a maintenance monitor device according to the present invention, FIG. 2 is a perspective view showing the configuration of the maintenance monitor device of the embodiment, and FIG. FIG. 4 is a hardware block diagram showing an electronic circuit in the apparatus of the example, FIG. 4 is a schematic diagram showing an arrangement mode of the oil amount level sensor used in the embodiment, and FIG. 5 is a diagram showing the oil amount level sensor of FIG. FIG. 6 is a conceptual diagram, FIG. 6 is a schematic diagram showing an arrangement of limit switches used in the embodiment, and FIG. 7 is an A of FIG. 1 showing an arrangement of the switches shown in FIG.
-A sectional view, FIG. 8 is an electric circuit diagram showing an input mode between the switch and the CPU shown in FIG. 6, FIG. 9, FIG. 10 and FIG.
11 (a) and 11 (b) are flowcharts each showing a processing procedure performed by the CPU shown in FIG. 1 ... Maintenance monitor device, 2 ... Module, 3
…… Acrylic board, 4 …… Case, 5 …… Polyester film, 6 …… Electronic circuit, 7 …… Liquid crystal, 8 …… Display section,
8a ~ 8e ... oil change instruction display, 8a '~ 8j' ... arrow,
8f-8j …… Display of filter replacement instruction, 11 …… Engine oil, 13 …… Oil level sensor, 14 …… Oil filter,
16 …… Limit switch, 19 …… CPU, 29 …… Nonvolatile R
AM.

Claims (2)

(57) [Claims] 1. An operation detecting means for detecting whether or not a machine is operating, a timer for measuring a time during which the machine is operating based on an output of the operation detecting means, and a replacement time for a replacement part of the machine. In addition to the module comprising: an exchange time setting means, a subtraction means for subtracting the time measured by the timer from the exchange time set by the exchange time setting means, and a display section for displaying the output of the subtraction means. An external storage device for storing the subtraction time of the subtraction means is provided outside the module, and when the module is replaced, the subtraction time stored in the external storage device is input to the module after replacement. The maintenance is characterized in that the subtraction means of the module after replacement is configured to restart the subtraction from the subtraction time stored in the external storage device. Nita apparatus. 2. An operation detecting means for detecting whether or not the machine is operating, a timer for measuring the time during which the machine is operating based on the output of the operation detecting means, and a replacement time for a replacement part of the machine. Replacement time setting means, subtraction means for subtracting the time measured by the timer from the replacement time set by the replacement time setting means, a display section for displaying the output of the subtraction means, and the replacement part for replacement. Replacement detecting means for detecting that the replacement part has been replaced, resetting means for resetting the display on the display unit to the replacement time when the replacement detecting means detects that the replacement part has been replaced, and the resetting means. When the reset is performed by, the current subtraction time in the subtraction means is replaced with the exchange time, and the subtraction is restarted from the exchange time. Maintenance monitoring device according to claim that there were example.