JPH1083467A - Operable remaining time predicting device for operating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operable remaining time predicting device capable of accurately predicting and displaying how many hours an operating machine can operate for the rest and executing a rational oil supply. SOLUTION: An arithmetic unit 12 inputs the fuel residual amount Q of a fuel tank 5 from a computing element 11 and measuring the fuel residual amount Q for almost every one hour, and computes a fuel consumption amount being a difference between a measurement values at the last time and at this time. Then, the arithmetic unit 12 computes a difference between fuel consumption amounts at the last time and this time (the variation amount of the fuel consumption amount), and stores the frequency (the number of times of generation) of the variation amount. The operable remaining time is the sum of above- mentioned fuel consumption amount and a value of that a probability of generating the variation value is multiplied by the variation amount of the fuel consumption amount, and the fuel residual amount Q measured this time is subtracted from that sum. Thus obtained operable remaining time is displayed on a display 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine remaining time predicting device for predicting how many hours the work machine can be operated from the present time.

[0002]

2. Description of the Related Art A working machine such as a hydraulic excavator is equipped with an engine, and a hydraulic pump is rotated by the engine.
A plurality of hydraulic actuators (hydraulic cylinders and the like) are driven by hydraulic oil discharged from the hydraulic pump to perform required work. By the way, work machines such as hydraulic shovels, unlike ordinary vehicles, often work at sites far from the city, so it is not possible to replenish the engine immediately when the engine runs out of fuel. Inability to do so significantly impairs productivity. On the other hand, since the load of the work machine fluctuates greatly, it is difficult for the operator of the work machine to predict the amount of fuel consumed, and the fuel supply runs out of time at the time of requesting refueling, and the work is often disabled. Things were happening.

In order to avoid such a shortage of fuel, conventionally,
A warning is displayed on the fuel gauge of the work machine when the fuel is reduced to the amount that can be operated for 1 hour at the maximum load,
Alternatively, a means for generating a warning sound to prompt the operator of the work machine to replenish the fuel is provided, and when the alarm is issued, the operator calls a refueling car by telephone or the like to receive the refueling. Also, in the case of a work site where a large number of work machines are used, such as a mine of direct digging (open pit mining), several refueling vehicles are prepared, and each refueling vehicle is in charge of each. Work machines were patrolled to prevent them from running out of fuel.

[0004]

The above means for alerting when the fuel is reduced to a maximum load capable of running for one hour means that the operator has enough fuel to run for one hour. Experience knows this, so ignore this alarm and continue working without requesting refueling.When you notice, the fuel level is low, and it will be too late to request refueling. Often, the work had to be stopped until they arrived.

[0005] In addition, in the means for patroling the refueling vehicle, refueling is performed as soon as possible in order to reliably avoid running out of fuel, and refueling is performed even though a large amount of fuel still remains. Time to suspend work once for refueling increases,
This was a factor that hindered productivity. In particular, the operating rate of working machines is 90% at sites where three shifts are implemented.
As described above, in such a case, an increase in the stop time for refueling directly leads to a decrease in productivity. further,
In order to reliably avoid running out of fuel, it is necessary to secure a sufficient number and sufficient number of refueling vehicles and personnel required for operating the refueling vehicles, and the cost is extremely large. Was.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and to accurately predict and display how many hours the work machine can be operated, thereby performing a reasonable refueling. It is an object of the present invention to provide a device for estimating the operable remaining time of a working machine that can perform the operation.

[0007]

In order to achieve the above object, the present invention is directed to an engine, a fuel tank for storing fuel of the engine, and a fuel gauge for detecting an amount of fuel in the fuel tank. A working machine comprising: a hydraulic pump rotated by the engine; and a plurality of hydraulic actuators driven by oil discharged from the hydraulic pump.
A first calculating means for calculating an actual fuel consumption of the engine based on a measured value of the fuel gauge during a predetermined period; and a difference between the actual fuel consumption obtained last time and the actual fuel consumption obtained this time. A second calculating means for calculating a variation of the fuel consumption amount, and a number of occurrences of the calculation result of the second calculating means for each of the sections by dividing the magnitude of the variation into a plurality of predetermined ranges. A third calculating means for calculating the occurrence probability of the variation obtained this time based on the stored contents of the storing means, and a fuel remaining amount obtained by the fuel gauge to the first Movable by dividing by the sum of the actual fuel consumption obtained by the calculating means and the value obtained by multiplying the fluctuation obtained by the second calculating means by the occurrence probability obtained by the third calculating means. And a fourth calculating means for calculating the remaining time.

According to a second aspect of the present invention, there is provided an engine, a fuel tank for storing fuel of the engine, a fuel gauge for detecting a fuel amount in the fuel tank, a hydraulic pump rotated by the engine, In a work machine including a plurality of hydraulic actuators driven by oil discharged from a hydraulic pump, a first calculating means for calculating an actual fuel consumption of the engine based on a measurement value of the fuel gauge for a predetermined period, A second calculating means for calculating a variation of the fuel consumption, which is a difference between the obtained actual fuel consumption and the currently obtained actual fuel consumption; Storage means for storing the number of occurrences of the calculation result of the second calculation means for each of the sections divided into ranges, and third calculation means for calculating the occurrence probability of each section based on the storage contents of the storage means When Determining means for determining whether or not a maximum occurrence probability is equal to or less than a predetermined value, and when the maximum occurrence probability is equal to or less than the predetermined value, a representative value of a maximum section of the sections is extracted; When the value exceeds a predetermined value, a representative value extracting means for extracting a representative value of the section of the maximum occurrence probability, and a fuel remaining amount obtained by the fuel gauge are used as an actual fuel consumption amount obtained by the first calculating means. A fourth calculating means for calculating the remaining movable time by dividing by a sum of the representative value extracted by the representative value extracting means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of an apparatus for estimating a remaining operable time of a work machine according to an embodiment of the present invention. In this figure, reference numeral 1 denotes an engine, 1a denotes a fuel injection pump of the engine 1, and 1b denotes an electromagnetic pickup which is installed on a rotating part such as a flywheel of the engine 1 and detects the rotation speed Ne of the engine 1. In a working machine such as a hydraulic shovel, an all-speed type diesel engine is used as the engine 1. Reference numeral 2 denotes a target rotation speed setting lever for setting a target rotation speed of the engine 1, and reference numeral 3 denotes a target rotation speed generator that outputs an electric signal proportional to the target rotation speed Nr set by the target rotation speed setting lever. 4 is a control device,
The target rotation speed Nr and the engine rotation speed Ne are input, and the fuel injection pump 1 is set on the basis of the difference between them (the rotation speed deviation ΔN).
The fuel injection amount a is controlled to control the engine 1 to rotate at a constant rotation speed as close as possible to the target rotation speed Nr.

Reference numeral 5 denotes a fuel tank, 6 denotes a fuel level meter for measuring the fuel level in the fuel tank 5, 6a denotes a float of the fuel level meter 6, and 6b detects a displacement of the float 6a and outputs an electric signal corresponding thereto. It is a displacement detector that outputs. Note that a fuel level meter that measures the distance to the liquid surface using an ultrasonic wave or a laser beam without using a float is also used. 7A, 7B, and 7C are variable displacement hydraulic pumps (hereinafter, simply referred to as hydraulic pumps) that are driven to rotate by the engine 1, and 8a, 8b, 8c,... Are operating levers of hydraulic actuators (not shown), 9a, 9b, Reference numerals 9c,... Denote pressure reducing valves (pilot valves) for outputting pilot pressures corresponding to the operation amounts and operation directions of the operation levers 8a, 8b, 8c,.

Reference numeral 10 denotes an operation state detector, which comprises a shuttle valve, a pressure switch, a logic circuit and the like (not shown), receives pilot pressures from pilot valves 9a, 9b, 9c,. , 8b, 8c, ...
.. Are output. The signal C is ON (a high-level signal) when at least one of the operation levers 8a, 8b, 8c,... Is operated (high-level signal), and OFF (when all the operation levers are in the non-operation state). Low-level signal). As the operation lever, an electric operation lever using a displacement sensor such as a potentiometer, and a structure that generates a pilot oil pressure according to an electric signal can be used. The detector 10 receives the respective electric signals and inputs the respective operation levers 8.
The operation states of a, 8b, 8c,... are determined.

An arithmetic unit 11 converts a displacement signal from a displacement detector 6b of the fuel level meter 6 into a remaining fuel amount Q. In some cases, a plurality of fuel level gauges 6 are provided in consideration of the measurement of the fuel level when the main body of the work machine is inclined. In this case, the arithmetic unit 11 operates based on the signal from each fuel level gauge 6. To calculate the fuel level when the work machine is in the horizontal state. Reference numeral 12 denotes an arithmetic unit, and the operation state detector 10
And the remaining fuel amount Q from the computing unit 11 to calculate the operable remaining time. Reference numeral 13 denotes a display device for displaying the remaining operable time obtained by the arithmetic unit 12. S
Indicates a signal indicating the remaining operable time.

Next, the configuration of the arithmetic unit 12 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a system configuration diagram of the arithmetic unit. In this figure, reference numeral 121 denotes an input / output interface that includes an A / D converter and a D / A converter, and that inputs and outputs signals C and Q and outputs a signal S. Reference numeral 122 denotes a central processing unit that performs predetermined operations and controls (CPU), 123 is CPU1
Read-only memory (R)
OM) and 124 are random access memories (RAMs) for storing the results of calculations and controls, and 125 is a timer for outputting time data. The ROM 123 includes an input program 123a, an initial processing program 123b,
Fuel consumption detection program 123c, operable remaining time estimation program 123d, and output program 123e
It has. FIG. 2 shows the display device 13 and a display example thereof. This display example shows a case where the remaining operable time is 2 hours.

Next, the operation of this embodiment will be described with reference to flowcharts shown in FIGS. 3, 4, and 7, and graphs shown in FIGS. Input program 123a
Inputs a required signal of the operation signal C and the remaining fuel amount Q according to a command from the CPU 122, and converts this into a digital value. FIG. 3 is a flowchart illustrating the initial processing program 123b shown in FIG. Initial processing program 1
In 23b, the CPU 122, the initial fuel tank 5 fuel supply (fuel supply) is determined whether or not made (Step S ₁₀ shown in FIG. 3), when the refueling has been performed, the remaining fuel quantity Q (0) Initialization of Q (0) = Q _max (Q _max is the maximum amount of fuel in the fuel tank 5) and frequency H (i)
That is, carried out H (i) = 0 (the procedure S _11). During the above processing, whether or not refueling has been performed may be determined based on an increase in the measured value of the fuel level meter 6 during refueling, or may be manually input during refueling. The frequency H (i) will be described later.

FIG. 4 is a flowchart illustrating the fuel consumption detection program 123c shown in FIG. CPU1
Reference numeral 22 refers to the output of the timer 125 to determine whether or not a predetermined sampling time, for example, 10 minutes, has elapsed since the previous execution of the fuel consumption detection program (from the time of refueling immediately after the initial processing is performed). to (Step S ₂₀ shown in FIG. 4). When the sampling time has elapsed, it activates the input program 123a to enter the actual fuel quantity Q (n) from the arithmetic unit 11 (Step S _21). In addition,
(N) is a number (number) indicating the number of times the fuel consumption detection by this program is performed, and (n)
Indicates the nth, and Q (0) in the above-mentioned initial processing program 123b indicates the 0th, that is, indicates that the fuel consumption has not been detected. When the working machine is driven, the fuel level of the fuel tank 5 fluctuates and it may be difficult to perform accurate measurement with the fuel level meter 6. Input the output signal C,
When none of the operation levers is operated, the remaining fuel amount Q (n) may be input. If this means is not used, the input of the signal C becomes unnecessary.

Next, the CPU 122 determines the current fuel remaining amount Q
By the (n) subtracting the previous fuel remaining amount Q (n-1), calculates the fuel consumption q (n) between to the current from the last time (Step S _22), then steps S ₂₂ The fuel consumption fluctuation amount Δq (n) is calculated by subtracting the fuel consumption q (n−1) obtained last time from the current fuel consumption q (n) obtained in the processing (step S). ₂₃ ). The fuel consumption q (n) and the variation Δq will be described with reference to a graph shown in FIG. In FIG. 5, the horizontal axis indicates the number indicating the number of times of fuel consumption detection, and the vertical axis indicates the fuel consumption q (n). The figure shows the current fuel consumption q (n) and the previous fuel consumption q
(N−1) and the variation Δq (n), which is the difference between the two, are shown.

[0017] Next, CPU 122 updates the frequency H (i) of the amount of change obtained by the processing of steps S ₂₃ Δq (n) (Step S _24). This frequency H (i) will be described with reference to the graph shown in FIG. In FIG. 6, the horizontal axis shows the area of the fluctuation amount,
The vertical axis indicates the number of occurrences (frequency) of the fluctuation amount in the area. Each area has the same size. For example, the area A has a variation of 0 to Δq ₁₀ , and the area B has a variation of Δq _{11 to} Δq.
₂₀ (value Δq ₁₁ is the next value after value Δq ₁₀ ), area C is the amount of fluctuation
It is selected to 0~-Δq _10. These regions are set, for example, by equally dividing about ± 50% of the fuel consumption by an arbitrary number (in FIG. 6, equally divide by 5 on both the + side and the − side). This frequency H
(I) is stored in such RAM 126, the variation amount [Delta] q each time new variation [Delta] q (n) is obtained in step S ₃₄
“1” is added to the frequency of the area corresponding to (n).

FIG. 7 is a flowchart for explaining the operable remaining time estimation program 123c shown in FIG. CP
U122 indicates that the remaining fuel amount Q (n) obtained by the fuel consumption detection program 123c is a predetermined value (limit value) Q
_limit is determined by whether or less (steps S ₃₀ shown in FIG. 7). In this embodiment, by using a frequency obtained by the flow chart Roh steps S ₂₄ shown in FIG. 4, since the estimated workable remaining time as shown in the following, the frequency of a considerable number not consume fuel more than a certain degree after refueling Can not get.
Therefore, by the above procedure S _30, wait for the remaining fuel quantity becomes equal to or smaller than the limit value Q _limit. Fuel remaining limit value Q
If the difference becomes equal to or less than the _limit, the relative frequency of the variation Δq (n) obtained by the fuel consumption detection program 123c, that is, the current variation Δq with respect to the total frequency up to the present.
The ratio of the frequency H (i) of the area to which (n) belongs, in other words, the probability p (i) at which the variation Δq (n) occurs is calculated according to the illustrated equation (step S ₃₁ ). Next, the CPU 122
It is calculated by the following equation workable remaining time Tr in the process steps S _32. Tr = Q (n) / [q (n) + Δq (n) · p (i)] That is, the operable remaining time Tr is the fuel consumption q per unit time obtained by the previous fuel consumption detection program q ( n)
Expected (occurring with probability p (i)) fuel consumption variation Δq (n) · taking into account recent fuel consumption trends
It is calculated by dividing the actual remaining fuel amount Q (n) obtained by the previous fuel consumption detection program 123c by the value obtained by adding p (i).

Next, the CPU 122 determines whether or not the calculated remaining operable time Tr is equal to or less than the required refueling time (step S ₃₃ ). The data is output to the display device 13 and displayed, for example, as shown in FIG. The required refueling time refers to the time required to start the refueling warning, and as an example, 8
In the case of time work, set it to about 1/4 of 2 hours.
When the remaining operable time is displayed on the display device 13, the operator of the work machine can know that the fuel remains only for the displayed time if the operation is continued in the same state as the current time. With reference to this, a request is made for refueling at an appropriate time, or measures such as extending the remaining operable time by lowering the engine speed or reducing the work load are performed.

As described above, in the present embodiment, the fuel consumption per unit time obtained by the fuel consumption detection program is:
The actual remaining fuel amount obtained by the previous fuel consumption detection program is divided by the value obtained by adding the expected fuel consumption fluctuation amount that takes into account the recent fuel consumption trends, and the remaining operable time Is calculated and displayed on the display device, so that the operator of the work machine can always know the accurate remaining operable time, and thereby can perform rational refueling. Also, by transmitting the remaining operable time to the refueling vehicle by means of radio or the like even by means for patroling the refueling vehicle, extremely efficient refueling can be performed, and the number of refueling vehicles and the number of refueling personnel can be reduced. Can be done.

FIG. 8 is a part of a flow chart for explaining the operation of the working machine remaining time predicting device according to another embodiment of the present invention. Input program 123a, initial processing program 123b, fuel consumption detection program 1
23c and the output program 123e correspond to the first
This is the same as each program of the embodiment. In the present embodiment, a part of the remaining operable time estimation program is different from the remaining operable time estimation program in the previous embodiment. In the present embodiment, when the fluctuation of the load of the work machine is large, for example, a case where the work with light load and the work with heavy load are performed in a mixed manner is considered, and the processing that can cope with this is also considered. Run. Hereinafter, the processing of this embodiment will be described with reference to the flowchart shown in FIG. 8 and the graph shown in FIG.

The CPU122, like the steps S ₃₀ in previous embodiment, fuel consumption detection program 123
fuel quantity Q obtained in c (n) is determined or less than a predetermined value Q _limit (Step S ₄₀ shown in FIG. 8), if it is less, all the frequency H (i) The relative frequency (probability) p (i) is calculated for each of the regions according to the illustrated formula (step _S41 ). Then compared with a predetermined set value the maximum value among the resulting probability p (i) in Step S ₄₁ (Step S _42), executes a different processing accordingly. The reason for performing such processing will be described with reference to FIG.

FIG. 9 is a graph showing the relationship between the probability p (i) and the set value. In the figure, the horizontal axis indicates the region for the fuel consumption Δq as in FIG. 6, and the vertical axis indicates the probability p (i). FIG. 9A illustrates a case where the probability of each region is less than the set value, and FIG. 9B illustrates a case where a region having a probability exceeding the set value exists. In the case shown in FIG. 9A, a predetermined time (for example, one hour)
This is the case where the fuel consumption is different for each case, and in this case, it is assumed that the work with a light load and the work with a heavy load are performed in a mixed manner. On the other hand, in the case as shown in FIG. 9B, it is estimated that the work is performed with a substantially constant load, and the fuel consumption is concentrated in one or two regions.

Therefore, in the present embodiment, when it is determined in step _S42 that the maximum probability among the probabilities of the respective regions is equal to or smaller than the set value as shown in FIG.
A representative value (arbitrarily selected such as an intermediate value or a maximum value in the region) of the region where the fuel consumption is the largest among the regions where the probability p (i) is not 0 is defined as Δq _max (step S ₄₃ ). on the other hand,
In step _S42 , when it is determined that the maximum probability among the probabilities of the respective regions exceeds the set value as shown in FIG. 9B, the representative of the region with the highest probability p (i) value (selection is as defined above) and [Delta] q _max (Tasks S _44). FIG.
(A) and (b) show respective representative values Δq _max when the representative value is selected as an intermediate value.

The CPU122, after taking out a representative value [Delta] q _max in the process of steps S ₄₃ or Step S _44, a workable remaining time Tr is calculated by the following equation (Step S _45). Tr = Q (n) / [q (n) + Δq _max ] As is apparent from this calculation formula, in the case shown in FIG. 9A, that is, when the work load is not constant and the fluctuation of the fuel consumption is large. Then, it is predicted that the subsequent fuel consumption may exceed the expected value, and the maximum fuel consumption variation up to that time is adopted. In the case shown in FIG. When the fuel consumption is relatively constant, it is predicted that the subsequent fuel consumption does not fluctuate so much, and the fuel consumption fluctuation with the highest probability is adopted. Processing after calculating the workable remaining time Tr in operation steps S ₄₅ is the same as the processing steps S _33, S ₃₄ shown in FIG. 7 in the previous embodiment.

As described above, in the present embodiment, the method of calculating the remaining operable time is changed depending on the work mode of the work machine. There is also an effect that it is possible to cope with the aspect.

[0027]

As described above, according to the present invention, the actual fuel consumption is calculated by adding the expected fuel consumption fluctuation in consideration of the recent fuel consumption tendency to the fuel consumption for a predetermined time. The remaining operable time is calculated by dividing the remaining fuel amount of the fuel, and the calculated remaining operable time is displayed on the display device, so that the operator of the work machine can know the accurate operable remaining time, and thereby Refueling can be implemented. or,
By transmitting the remaining operable time to the refueling vehicle by radio or the like even with the means for patroling the refueling vehicle, extremely efficient refueling can be performed, and the number of refueling vehicles and the number of refueling personnel can be reduced. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of an apparatus for estimating a remaining operable time of a work machine according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of the arithmetic device shown in FIG. 1;

FIG. 3 is a flowchart illustrating an operation of the arithmetic device illustrated in FIG. 1;

FIG. 4 is a flowchart illustrating an operation of the arithmetic device shown in FIG. 1;

FIG. 5 is a graph showing a relationship between a fuel consumption amount and a fluctuation amount of the fuel consumption amount.

FIG. 6 is a graph showing the relationship between the amount of change in fuel consumption and the frequency at which it occurs.

FIG. 7 is a flowchart illustrating an operation of the arithmetic device illustrated in FIG. 1;

FIG. 8 is a flowchart illustrating an operation of a calculation device of the operable remaining time prediction device of the work machine according to another embodiment of the present invention.

FIG. 9 is a graph showing a relationship between a probability of a variation in fuel consumption and a set value.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 1a Fuel injection pump 2 Target rotation speed setting lever 3 Target rotation speed generator 4 Control device 5 Fuel tank 6 Fuel level meter 7A-7C Hydraulic pump 8A-8C Operation lever 10 Operation state detector 11 Computing device 12 Computing device 13 Display device

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takashi Yagyu 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor Yukihiko Sugiyama 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory

Claims (3)

[Claims] 1. An engine, a fuel tank for storing fuel of the engine, a fuel gauge for detecting a fuel amount of the fuel tank, a hydraulic pump rotated by the engine, and a hydraulic pump driven by oil discharged from the hydraulic pump. A first calculating means for calculating the actual fuel consumption of the engine based on the measured value of the fuel gauge during a predetermined period, and A second calculating means for calculating a change in fuel consumption, which is a difference between the fuel consumption and the actual fuel consumption obtained this time, and dividing the magnitude of the change into a plurality of predetermined ranges, Storage means for storing the number of occurrences of the calculation result of each of the sections in the calculation means, and calculating the occurrence probability of the variation obtained this time based on the storage content of the storage means.
Calculating means, and the remaining fuel amount obtained by the fuel gauge,
The actual fuel consumption obtained by the first calculating means and the second fuel consumption;
And a fourth calculating means for calculating the remaining movable time by dividing the variation obtained by the calculating means by the sum of the variation multiplied by the occurrence probability obtained by the third calculating means. A device for predicting the operable remaining time of a working machine, characterized in that: 2. An engine, a fuel tank for storing fuel for the engine, a fuel gauge for detecting an amount of fuel in the fuel tank, a hydraulic pump rotated by the engine, and a hydraulic pump driven by oil discharged from the hydraulic pump. A first calculating means for calculating the actual fuel consumption of the engine based on the measured value of the fuel gauge during a predetermined period, and A second calculating means for calculating a change in fuel consumption, which is a difference between the fuel consumption and the actual fuel consumption obtained this time, and dividing the magnitude of the change into a plurality of predetermined ranges, Storage means for storing the number of occurrences of the calculation result of each of the sections of the calculation means, and third calculation means for calculating the occurrence probability of each section based on the storage content of the storage means;
Determining means for determining whether or not a maximum occurrence probability is equal to or less than a predetermined value, and when the maximum occurrence probability is equal to or less than the predetermined value, a representative value of a maximum section of the sections is extracted; A representative value extracting means for extracting a representative value of the category of the maximum occurrence probability when exceeding a predetermined value;
The remaining fuel time obtained by the fuel gauge is divided by the sum of the actual fuel consumption obtained by the first calculating means and the representative value extracted by the representative value extracting means to calculate the remaining movable time. And a fourth calculating means for performing the operation. 3. The operation according to claim 1, wherein the operation by the third operation means and the fourth operation means is
An apparatus for estimating the remaining operable time of a working machine, wherein the operation is performed when the remaining fuel amount obtained by the fuel gauge is equal to or less than a predetermined value.