JPH02236321A - Construction equipment - Google Patents

Abstract

PURPOSE:To simplify operation, prevent operational error and make the setting of command mode, etc., easy by recording command mode in a command mode recording means, reading it off from a command mode reading means and putting out command signals to a control means. CONSTITUTION:A command recording bar code card 41 consisting of bar code areas recording command mode and command mode for the release and reset of auto idle, and a bar code reading device 42 consisting of a bar code sensor 43, a signal conductor 44 and a reading device main body 45 are installed. Furthermore, a control unit 47 consisting of an operating condition judging circuit 36 and an operation pattern calculating circuit 38 is installed, and connected to pressure switches 28, 29 for traveling and work and the reading device 42. A desired command mode is selected merely by scanning code areas of one or multiple number of cards 41 with the bar code sensor 43.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction machine used as, for example, a hydraulic excavator, a hydraulic crane, or the like.

[Prior Art] Generally, a hydraulic excavator has a vehicle body consisting of a lower traveling body and an upper revolving body, and a hydraulic pump driven by an engine is installed in the upper revolving body. A traveling hydraulic motor provided on the lower traveling body is rotated to cause the vehicle to travel, and a working device is provided on the upper rotating body, and each hydraulic cylinder of the working device is operated to perform earth and sand excavation work. .

By the way, if the engine rotation speed is N and the displacement capacity of the hydraulic pump is Δq, then the discharge capacity Q is Q=ΔqXN ・
... (1) Therefore, the discharge capacity Q is proportional to the engine speed N, while the discharge pressure P and discharge capacity Q of the hydraulic pump are PXQ → constant ... (2) and are approximately There is an inversely proportional relationship.

Therefore, the operator commands the engine speed, travel speed, etc. to desired values according to work conditions, travel conditions, etc. On the hydraulic circuit side, the pressure in the travel hydraulic circuit that controls the travel hydraulic motor and the swing hydraulic pressure are controlled by the operator. The control unit detects the pressure in the work hydraulic circuit that controls the motor or hydraulic cylinder for work equipment, and the control unit sets the optimum engine speed based on these command values and detected values, as well as the optimum pump discharge capacity and pressure. controlled to do so.

Hydraulic excavators shown in FIGS. 4 to 10 are conventionally known as construction machines whose engines and hydraulic pumps are controlled in the manner described above.

First, FIG. 4 shows a hydraulic excavator 1, which includes a lower traveling body 2, an upper rotating body 4 which is rotatably provided on the lower traveling body 2 via a swing device 3, and an upper rotating body 4. It is generally composed of a working device 5 provided on the front side of the body 4. The working device 5 includes a boom 6, an arm 7, a packet 8, a boom cylinder 9 as a hydraulic actuator, an arm cylinder 10, and a packet cylinder 1.
It consists of 1st class.

Next, 12 is an engine provided in the upper revolving body 4,
The engine rotation speed of the engine 12 is controlled by a governor lever 13 attached thereto.

In other words, the governor lever l3 is rotated against the spring 14 from a high rotation position P to a middle rotation position E to a low rotation position, thereby setting the engine rotation speed according to the rotation angle. be. 15.16 is the governor lever 1
3 is a lever actuating cylinder that operates the lever actuating cylinder 15.18, and 17.18 is a solenoid valve for controlling the lever of the 2-position 3 boat that controls the pressure oil supplied to each of the lever actuating cylinders 15.16. is switched by a signal from a control unit which will be described later. When the communicating position of the solenoid valve 17.18 is set to "1" and the blocking position is set to "0", the governor lever l3 is activated via the lever operating cylinder 15.16. The rotation is controlled as shown in Table 1 below. Table 1 Engine Control Mode Thus, the rotational speed control device 19 for the engine 12 according to the prior art is comprised of a governor lever 13, a spring 14, cylinders 15 and 16 for lever operation, electromagnetic valves 17 and 18, and the like.

Next, 20.20 is a variable displacement hydraulic pump rotationally driven by the engine 12, and 21.21 is a tilting mechanism of the hydraulic pumps 20, 20, for example, a tilting mechanism of a swash plate, a valve plate, etc. Each variable capacity actuator 21 includes a tilting actuator section 21A,
The actuator section 21B is composed of a stop lever actuator section 21B. Here, the tilting actuator section 2LA uses the discharge pressure of the hydraulic pump 20 as its own pressure, and when the discharge pressure is higher than a predetermined pressure, the swash plate etc. is set to the maximum tilting angle, and when the discharge pressure is lower than the predetermined pressure, the tilting angle is set to the minimum tilting angle. It is designed to have a corner. In addition, the actuator section 21B for the stopper is attached to the actuator section 21A for tilting, and has a stopper for regulating the maximum tilting angle of a swash plate, etc. (referred to as inversion angle)
and a small maximum tilt angle (hereinafter referred to as the small maximum tilt angle)
It is now possible to select. Reference numeral 22 denotes a two-position, three-boat solenoid valve that controls the pressure oil supplied to the stopper actuator section 21B.The solenoid valve 22 is switched by a signal from a control unit, which will be described later, to move the stopper actuator section 21B to the large side or Supply and discharge pressure oil to achieve the maximum tilt angle on the small side.

Thus, the capacity control device 23 of the prior art is composed of variable capacity actuators 21, 21, solenoid valves 22, etc., and controls the capacity between the maximum tilt angle and the minimum tilt angle using the self-pressure of the hydraulic pump 20, and Increase the maximum tilt angle position,
It is designed to be controlled to a small extent.

In the figure, 24 is a small hydraulic pump driven by the engine 12, and the hydraulic pump 24 is connected to the cylinder 1 for lever operation.
5, 16, which supplies pressure oil to the stopper actuator section 21B and the like.

Next, reference numeral 25 denotes a control valve constituted by a multiple valve or the like, and the control valve 25 is a swinging hydraulic motor 26, 26 for driving provided at the left and right positions of the lower traveling body 2, and a swinging device 3 for driving the swinging device 3. It controls the hydraulic motor 27, each cylinder 9, 10, 11, etc. of the working device 5, and is operated by an operating lever provided in the operator's cab 4A of the upper revolving structure 4, and the hydraulic motor 27, each cylinder 9, 10, 11, etc. It is designed to switch and control the pressure oil. The control valve 25 is configured as a pair of multiple valves on the left and right sides corresponding to the hydraulic pumps 20, 20.

Further, 28 is a running pressure switch attached to the control valve 25, for example, and the running pressure switch 28 detects the pressure in the running hydraulic circuit that controls the running hydraulic motor 26, so that the hydraulic excavator 1 is activated. This detects whether the vehicle is running or not. Note that the traveling pressure switch 28 corresponds to the traveling detecting means of the present invention, and is not limited to the pressure switch, and may also detect displacement of the traveling operation lever of the control valve 25. It may be of any type as long as it can detect the amount or the running state.

On the other hand, 29 is a working pressure switch attached to the control valve 25, for example, and the working pressure switch 29 controls the pressure in the swing hydraulic circuit that controls the swing hydraulic motor 27 or each cylinder 9, 10, 11, etc. By detecting the pressure in the hydraulic circuit for the cylinder to be controlled, it is detected whether the hydraulic excavator I is in excavation or turning operation. Note that the work pressure switch 29 corresponds to the work detection means of the present invention, and is not limited to the pressure switch. It may also be possible to detect the amount of operation of a control lever for operating the hydraulic motor 27, each cylinder 9, 10, 11, etc.

Next, 30 is an engine rotation speed setting switch for setting the rotation speed of the engine 12, and the setting switch 30 has a switch lever 30A, a high rotation position contact 30P, a medium rotation position contact 30E, and a low rotation position contact. It consists of 30I,
The contacts 30P, 30E, and 30I are intermittently connected and disconnected between a power source 31 and a ground 32 via a switch lever 30A. Then, a command signal consisting of high rotation P, medium rotation E, and low rotation I is output to the control unit according to the operation mode of the switch lever 30A.

On the other hand, 33 is a high/low speed selector switch consisting of an ON/OFF switch. When the hydraulic excavator 1 is running, the switch 33 is set to the OFF side to switch to high speed running H, and the switch 33 is set to the ON side to switch to high speed running (L). It commands the vehicle to switch to the vehicle and outputs this running signal to the control unit.

Further, 34 is an auto idle release switch consisting of an ON/OFF switch, and the auto idle release switch 3
4 is set to the ON side, for example, so that the engine 12 automatically enters auto-idle mode when in neutral, which will be described later. On the other hand, by setting it to the OFF side, the auto idle mode will be canceled even when in neutral, which will be described later.
The engine l2 is controlled to a predetermined rotational speed based on the determination result of the operating state, and this idle release signal is output to the control unit.

Next, 35 is a control unit constituted by, for example, a microcomputer, and the control unit 35 includes an operating state determination circuit 36 and a command state determination circuit 3.
7. Consists of driving pattern calculation circuit 38 and the like.

The input side of the driving state determination circuit 36 is the driving pressure switch 28. The input side of the command state determination circuit 37 is connected to the engine speed setting switch 30, the high/low speed changeover switch 33, and the auto idle release switch 34, and the input side of the pattern calculation circuit 38 is connected to the operation pressure switch 29. It is connected to the state determination circuit 36 and the command state determination circuit 37, and the output side is connected to each electric Eli valve 17, 18.22.

Here, the operating state determination circuit 36 stores a map 36A shown in FIG. Depending on the OFF state, it is determined from the map 36A that the current operating state of the hydraulic excavator 1 is one of "traveling", "excavation", "travel+excavation", and "neutral".

The command state determination circuit 37 also stores a map 37A shown in FIG.
The high rotation position P, medium rotation position E, and low rotation position set by
Read either the high speed position "H" or the low speed position rLJ, and from the map 37A, the switch state is rPH.
J, rPLJ, rEHJ, rELJ, rIHJ
, rILJ.

Further, the driving pattern calculation circuit 38 stores a map 38A shown in FIG. 9 and a map 38B shown in FIG. Based on the presence or absence of auto-idling cancellation, the driving pattern is determined by referring to the map 38B as nine types of patterns rlJ, r2J, . It calculates the rotation speed and pump discharge capacity and operates the solenoid valves 17, 18, and 22.

That is, in the map 38A of FIG. 9, if the X-axis is the engine rotation speed N and the Y-axis is the discharge capacity Q of the hydraulic pump 20, then the symbol A in the figure indicates the maximum tilt of the swash plate, etc. of the hydraulic pump 20 on the large side. Characteristics when the swash plate, etc. is at the small side large tilt angle, symbol B indicates the characteristics when the swash plate, etc. is at the minimum tilt angle, and symbol B indicates the characteristics when the swash plate, etc. is at the minimum tilt angle. is N, the intermediate point is N2, and the low rotation speed is N. Then, the characteristics A, B, C and the rotation speed N,, N2, N. Which intersection is the pattern rlJ, r2
J,... is defined as "9". That is, pattern "1" sets the engine rotational speed N to the maximum rotational speed N1, sets the swash plate of the hydraulic pump 20 to the maximum tilt angle on the large side, and maintains the discharge capacity Q at the maximum. On the other hand, pattern "9" sets the engine rotational speed N to the minimum rotational speed N, and sets the swash plate of the hydraulic pump 20 to the minimum tilt angle to maintain the discharge capacity Q at the minimum.

Furthermore, the map 38B in FIG.
The operating state determined by "traveling", "excavation", "traveling + excavation", or "neutral" and the command mode determined by the command state determination circuit 37, rPHJ, rPLJ, rEH
J, rELJ, rIHJ, rILJ,
From "auto idle cancellation" with the auto idle cancellation switch 34, the driving pattern is changed to rlJ, r2J,...
・Set to one of "9". In addition, when the auto idle release switch 34 is set to "auto idle" and the driving state is "neutral", the driving pattern "9" is automatically set.
is selected.

In this way, after reading the driving pattern from the map 38B, the driving pattern calculation circuit 38 accesses the map 38A, sets the engine speed N and the characteristics A and B of the hydraulic pump 20 corresponding to the driving pattern, and calculates the driving pattern according to the driving pattern. A valve control signal is output to the solenoid valves 17, 18, and 22 so that

In addition, numeral 39 in FIG. 5 indicates a monitor device, and the monitor device 39 monitors the operating state of the engine 12 and the working device 5.

The conventional hydraulic excavator is constructed as described above, and its operation will be described next.

Now, the operator sets the engine speed setting switch 30 to the medium rotation position rEJ based on the driving and work conditions.
It is assumed that the high/low speed selector switch 33 is set to the high speed position rHJ, and the auto idle release switch 34 is set to "auto idle release".

In this state, it is assumed that excavation work is being performed by the working device 5 while the hydraulic excavator 1 is being driven by the traveling hydraulic motor 26.

Therefore, in this state, the running pressure switch 28
, the working pressure switches 29 all detect high pressure oil and turn on, and this detection signal is sent to the control unit 35.
is input to the operating state determination circuit 36 of the
determines the driving state as "driving + digging" from the map 36A.

On the other hand, the command state determination circuit 37 detects the intermediate rotation position rEJ of the engine rotation speed setting switch 30 and the high/low speed changeover switch 3.
3 is read, and it is determined from the map 37A that the command state is rEH mode.

Further, the driving pattern calculation circuit 38 refers to the map 38B and reads out the driving pattern as "3" based on the above-mentioned determination result "driving + excavation" and "rEH mode", and then refers to the map 38A and reads out the driving pattern as "3". The engine rotation speed N2 corresponding to "3" and characteristic A are read out.

Furthermore, the driving pattern calculation circuit 38 outputs a signal only to the electromagnetic valve 17 so that the rotation speed N of the engine 12 is set to the middle rotation N2%, that is, the governor cover 13 is at the middle rotation position E.

At this time, the characteristic of the hydraulic pump 20 is A, and it is necessary to maintain it at the maximum tilt angle on the large side, so no signal is output to the solenoid valve 22, and therefore the stopper actuator section 21B of the variable capacity actuator 2l is not operated, and only the tilting actuator section 21A maintains the swash plate and the like at an optimal tilting angle according to the self-pressure of the hydraulic pump 2o.

On the other hand, when the work is stopped in the above-mentioned state (when traveling is stopped and the working device 5 is stopped, both the traveling pressure switch 28 and the working pressure switch 29 are turned OFF, the operating state becomes "neutral", and the switch The status is rEH mode.”
Therefore, "8" is selected as the driving pattern. Note that if the auto-idle release switch 34 is set to auto-idle, driving pattern "9" is set.

The control unit 35 of the prior art operates as described above, but when in a command state or operating state other than the specific example, another operating pattern is set and the engine speed N.
,N. and the tilting characteristics A and B of the hydraulic pump are set, and the optimum engine torque, fuel consumption rate, etc. are automatically selected.

[Problem to be solved by the invention]

However, the prior art described above has an engine speed setting switch 30, a high/low speed changeover switch 33, and an auto idle release switch 3 in the operator's cab 4A of the upper revolving structure 4.
4, etc., and each is connected to the control unit 35 via a signal line.

However, the operator, while monitoring the operating and work conditions,
These switches 30, 33, and 34 must be operated, and since there are a large number of switches and operations, the operation is not only cumbersome, but also prone to erroneous operation. In particular, as the number of commands given by the operator increases, the number of switches also increases, making the operation even more complicated.

On the other hand, each of the aforementioned switches 30, 33, 34, etc. is connected to the control unit 35 through a signal line, and the more the number of these signal lines increases, the more the engine 1
There is a problem in that it is easily affected by noise from other sources, shocks during work, etc., and is likely to cause malfunctions. In particular, since construction machines such as hydraulic excavators are used at work sites where there are many disturbances, sufficient consideration must be given to reliability.

Furthermore, the commands given by the operator have been made even more sophisticated. If an attempt is made to make the system more complex, major modifications such as installing a new switch in the driver's cab will be required, and there will be problems in that it will be difficult to change the driving pattern.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to provide a construction machine in which an operation pattern can be set simply by an operator reading a pre-coded operation mode. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides a vehicle body that travels with a hydraulic motor for travel and is equipped with a working device operated by a hydraulic actuator, an engine mounted on the vehicle body, and a system that controls the rotation speed of the engine. a variable displacement hydraulic pump driven by the engine; a displacement control device that controls the displacement of the hydraulic pump; and a hydraulic motor for driving from the hydraulic pump. A construction machine comprising: a control valve for controlling pressure oil supplied to and discharged from a hydraulic actuator; and a traveling detection means for detecting whether or not the vehicle body is in a traveling state by the traveling hydraulic motor; a work detecting means for detecting whether or not the device is in a working state; a command mode recording means in which the rotational state of the engine and the traveling state of the vehicle body to be commanded are coded according to the command mode; and the recording means a command mode reading means that reads a command mode recorded in the command mode and outputs a signal according to the command mode; and a command mode reading means based on each detection signal from the travel detection means and the work detection means and a command signal from the command mode reading means. The present invention is characterized in that a control means for outputting a control signal to the rotation speed control device and the capacity control device is provided.

[Effect]

With this configuration, a command mode storage means consisting of one or more cards is provided in the driver's cab, etc., and a command mode reading means operated by the operator is provided.
If the engine rotational state and vehicle running state are coded in the command mode storage means according to the command mode, the operator can simply scan the code in the command mode storage means using the command mode reading means. It becomes possible to set a desired command mode.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3.

Note that the same reference numerals are given to the same components as in the prior art described above, and the explanation thereof will be omitted. A switch 34 etc. are not provided.

However, 41 is a command recording barcode card as a command mode recording means of the present invention, and the barcode card 41
is made of a single sheet of paper (card), and is provided by pasting or other means in a position where the operator can easily perform scanning operations in the operator's cab 4A.

Here, the command recording barcode card 41 is rPHJ, rPLJ, rE shown in FIG. 8 or 10.
Bar code areas 41A, 41B, . . . which record command modes consisting of "H", rEL", rrHJ, rlLJ.
41F, a barcode area 41G in which a command mode for canceling automatic idle is recorded, and a barcode area 41H in which a command mode for returning to auto idle is recorded.

Reference numeral 42 denotes a barcode reading device as a command mode reading means according to the present invention, and the barcode reading device 42 is installed in the driver's cab 4
The barcode card 4l is installed in the barcode card 4l by an operator and outputs a command signal by reading the data in the barcode card 4l. Here, the barcode reading device 42 includes a barcode sensor 43 such as a hand scanner that optically scans each code area 41A to 41H of the barcode card 41, and a signal! ! The barcode sensor 43 is connected to a reading device main body 45 via a barcode sensor 44, and the reading device main body 45 converts signals read by the barcode sensor 43 into command modes in the barcode areas 41A to 41H. It converts the signal into a command signal. and,
The command signal converted by the reading device main body 45 is outputted to a control unit 47, which will be described later, via a data line 46.

Furthermore, 47 is a control unit as a control means according to the present invention, and although this control unit 47 has a driving state determination circuit 36 and a driving pattern calculation circuit 38 like the conventional technology, the command state according to the conventional technology A determination circuit 37 is not provided. That is, in this embodiment, the command signal read by the barcode reader 42 and outputted can be directly input to the operation pattern calculation circuit 38, and the switches 30, 33, 34, etc. of the prior art are not provided. Coupled with this, the engine speed setting switch 30, high/low speed changeover switch 33, etc. are turned on and off.
This is because there is no need to calculate the command mode from the F state. Therefore, in the control unit 47 of this embodiment, the input side of the driving pattern calculation circuit 38 is connected to the driving state determining circuit 3.
6. It differs from the prior art in that it is configured to be connected to a barcode reading device 42.

The present embodiment is configured as described above, and its operation will be described next.

Now, assume that the operator attempts to cancel auto-idling and set the command mode to rPLJ mode, depending on the running and working conditions of the hydraulic shovel 1.

In this case, the operator grasps the barcode sensor 43, scans the barcode area 41G of the command recording barcode card 4l, and then scans the barcode area 41G of the command recording barcode card 4l.
Just scan B. As a result, the read signal from the barcode sensor 43 is output to the reading device main body 45, and from the reading device main body 45, a command signal for auto-idling cancellation and a command signal for rPLJ mode are sent to the data line 4.
6 is output to the driving pattern calculation circuit 38 of the control unit 47.

On the other hand, the driving state determination circuit 36 is connected to the driving pressure switch 28.
．． The operating state is determined according to the switch state of the working pressure switch 29, and the result of this determination is input to the operating pattern calculation circuit 38.

Now, the determination result by the driving state determination circuit 36 is "driving".
If so, the driving pattern calculation circuit 38 accesses the map 38B based on the rPLJ mode command signal input from the barcode reader 42 and determines the driving pattern "
4'' is set, and then the engine rotational speed N2 and the tilting characteristic B of the hydraulic pump 20 corresponding to the operation pattern ``4'' are read out with reference to the map 38A.

Then, as in the prior art, the driving pattern calculation circuit 38 outputs a signal only to the solenoid valve 17 so that the rotation speed of the engine 12 becomes medium rotation N2, and also outputs a signal to the solenoid valve 22 to vary the capacity. The stopper actuator portion 21B of the actuator 21 is operated to maintain the maximum tilt angle of the swash plate of the hydraulic pump 20 at the small maximum tilt angle, and the pump discharge capacity characteristic is set to B.

The control unit 47 of this embodiment operates as described above, but when in a command state or operating state other than the specific example, another operating pattern is set, and the engine speed N1
. This is done by ning.

Thus, according to this embodiment, the barcode reading device 42
Since the desired command mode can be selected simply by scanning the command recording barcode card 41, there is no need to combine and operate many types of switches as in the prior art, and the operation is simple. , there is no fear of erroneous operation.

Furthermore, since it is only necessary to connect the barcode reader 42 and the control unit 47 with one data line 46, the number of data lines can be reduced compared to the conventional technology. It is less susceptible to the effects of noise during work by the work device 5, and reliability can be significantly improved.

Also, change the command mode or work mode,
When adding, change the command recording barcode 42 to a new symbol code, and also change the control unit 4.
It is only necessary to update the program in 7, and it is extremely easy to change or add command modes.

Furthermore, unlike conventional switches, the command recording barcode 41 has no restrictions on installation locations, so it can be pasted in any location or held by the operator himself, and there is no limit to the number of command modes. It is extremely easy to handle as it is not subject to any damage.

In the embodiment, the command recording barcode card 41 is used as the command mode recording means of the present invention, and the barcode reading device 42 is used as the command mode reading means, but the present invention is not limited to this. A magnetic recording medium (magnetic card) may be used as the command mode recording means, and a magnetic code reading device consisting of a magnetic sensor or the like may be used as the command mode reading means (optical, magnetic, or electrical means may be used). .

In addition, in the embodiment, the command mode recording barcode card 4
1 has been described as consisting of one card (paper sheet), but it may also be composed of multiple barcode cards. In this case, the operator can easily carry the card. It is even more convenient to handle. In this case, the same applies when configured as a magnetic card or the like made of a magnetic recording medium.

Further, in the embodiment, a hydraulic excavator having a swinging hydraulic motor 27 is exemplified as the construction machine of the present invention, but the invention may also be applied to other construction machines equipped with a vehicle body that does not have a swinging ability, such as a wheel loader or a bulldozer. Of course.

〔Effect of the invention〕

The construction machine according to the present invention is as described in detail above, and has one or more command mode recording means to record command modes such as traveling and working, which are commanded by an operator. read by mode reading means;
Since the command signal is output to the control means, the command mode selection operation is easy and there is no risk of erroneous operation.Moreover, the command mode recording means can be pasted inside the driver's cabin or carried by the operator himself. It is easy to handle because it allows you to set the command mode. This has advantages such as easy updating.

[Brief explanation of drawings]

Figures 1 to 3 relate to embodiments of the present invention; Figure 1 is a hydraulic and electrical circuit configuration diagram showing the overall configuration of the control system according to this embodiment, and Figure 2 is a diagram showing the interior of the control unit in Figure 1. Fig. 3 is a front view showing a barcode card that has been converted into a barcode, and Figs.
Figure O relates to the conventional technology, Figure 4 is an external view of a hydraulic excavator, Figure 5 is a hydraulic-electrical circuit configuration diagram showing the overall configuration of the control system according to the conventional technology, and Figure 6 is the configuration and wiring inside the control unit. 7 is an explanatory diagram showing the determination processing of the operating state determination circuit in the control unit,
FIG. 8 is an explanatory diagram showing the determination processing of the command state determination circuit in the control unit, FIG. FIG. 10 is an explanatory diagram showing the processing operation of the driving pattern calculation circuit in the control unit. 1... Hydraulic excavator, 2... Lower traveling body, 4...
Upper revolving body, 5... Working device, 9, 10.11...
Cylinder (hydraulic actuator), 12... Engine, 19... Rotation control device, 20... Hydraulic pump, 2
3... Capacity control device, 25... Control valve, 2
6... Hydraulic motor for traveling, 28... Pressure switch for traveling (travel detection means), 29... Pressure switch for work (work detection means), 41... Bar code card for command recording (command mode recording means), 42... barcode reading device (command mode reading means), 47... control unit.

Claims (1)

[Claims] A vehicle body that travels by a travel hydraulic motor and is equipped with a working device operated by a hydraulic actuator;
An engine mounted on the vehicle body, a rotation speed control device that controls the rotation speed of the engine, a variable displacement hydraulic pump driven by the engine, and a displacement control device that controls the displacement of the hydraulic pump. , in a construction machine comprising a travel hydraulic motor from the hydraulic pump, and a control valve for controlling pressure oil supplied to and discharged from the hydraulic actuator, the travel hydraulic motor detects whether or not the vehicle body is in a traveling state. a running detection means, a work detection means for detecting whether or not the working device is in a working state by the hydraulic actuator, and a rotational state of the engine and a running state of the vehicle body to be commanded, which are coded according to a command mode. a command mode recording means for reading the command mode recorded in the recording means and outputting a signal according to the command mode; and each detection signal and command from the traveling detecting means and the work detecting means. A construction machine comprising: a control means for outputting a control signal to the rotation speed control device and the capacity control device based on a command signal from a mode reading means.