JP3493134B2 - Vehicle unlocking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unlocking device for unlocking the locked state of operation of a vehicle including a construction machine, and more particularly to a device suitable for use in the purpose of preventing theft and malfunction of a construction machine. It is a thing.

[0002]

2. Description of the Related Art Conventionally, for the purpose of preventing the construction machine from being stolen, a device in which the locked state of the operation of the engine cannot be released without inputting a personal identification number has been proposed and applied for a patent.

For example, in the device disclosed in Japanese Unexamined Patent Publication No. 9-50584, a ten-key input device is provided in the operator's cab of a construction machine, and a specific personal identification number is input by the ten-key input device before the engine operation is locked. Is released so that the engine can be started.

[0004]

However, if the ten-key input device is separately prepared only for unlocking, the cost is increased. Further, the output signal of each key of the numeric keypad input device is only an ON / OFF digital signal. Therefore, a plurality of switches (keys) are required to input a complicated personal identification number. In other words, it is necessary to provide a large number of switches (keys), which is also the main cause of cost increase. If the PIN code is entered with only one key, only a simple ON / OFF signal is output, so the locked state can be easily released, and the initial purpose such as theft prevention can be achieved. It cannot be achieved.

Further, as shown in FIG. 27, the left and right operation levers 20L, 2
Various operators such as 0R (operating lever, pedal, engine throttle, etc.) are provided. Here, the construction machine is provided with a monitor 61 for monitoring the operating state. When the ten-key input device is arranged on the monitor 61 as the switch group 61b, it must be arranged at the operator's hand so that the operator can operate the switch group 61b. Therefore, the left and right operation levers 2
When 0L and 20R are arranged in front of the monitor 61, the operation levers 20L and 20R become obstacles and the monitor 6
The visibility of the first monitor display unit 61a is impaired. In addition,
When the monitor 61 is arranged in front of the left and right operation levers 20L and 20R, the monitor 61 becomes an obstacle and the operability of the left and right operation levers 20L and 20R is impaired. In any case, arranging the monitor 61 with a large space near the operation levers 20L and 20R deteriorates the habitability of the narrow cab 60.

Further, if the switch group 61b such as the ten-key input device is not arranged on the monitor 61, only the monitor portion 61a need be arranged. Therefore, as shown in 61 ', the left and right operation levers 20L and 20R are attached to the monitor. It can be moved to a place away from, and the visibility of the monitor, the operability of the lever, and the habitability of the cab can be improved.

The present invention has been made in view of the above circumstances, and enables a complicated signal (personal identification number) to be generated without providing a large number of switches, and locks near the operation lever. Solved to improve the visibility of the monitor or the operability of the operating lever or the habitability of the driver's cab by moving the monitor to a place away from the operating lever without the need to provide a monitor with an input unit for releasing the state This is an issue.

[0008]

According to the first aspect of the present invention, an operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and an analog output from the analog signal generating means. a controller for outputting a driving control signal for driving and controlling the equipment mounted on the vehicle based on the signal, to lock the operation of the vehicle
And the lock release command signal is input.
The lock means for releasing the locked state is provided in the vehicle body,
By the lock means according to a constant operation input pattern
In a vehicle unlocking device in which a locked state is released , the controller stores a constant change pattern of an analog signal output from the analog signal generating means.
And the change pattern of the analog signal output from the analog signal generating means by the operation of the operation means is matched with a certain change pattern stored in the memory , and they match. If it is determined that the lock release command signal is output
I have a program and

That is, according to the configuration of the first invention, as shown in FIGS. 1, 4 and 6, a constant change pattern () of the analog signal AD output from the analog signal generating means (engine throttle) 41 ( (See FIG. 6) is set in advance.

And operating means (engine throttle)
It is determined that the change pattern of the analog signal AD output from the analog signal generation means 41 by the operation of 41 matches the set constant change pattern, and when it is determined that they match, the lock is performed. The locked state by the means is released (YES at step 208 in FIG. 4, step 209). That is, the command signal i corresponding to the throttle position is output to the engine 2.

As described above, the analog signal generating means (engine throttle) 41 is already provided in the construction machine as a means for driving and controlling the equipment (engine (governor)) 2 mounted on the vehicle. Since the existing analog signal generating means 41 is used, it is not necessary to provide a monitor having an input unit (signal generating device) for releasing the locked state near the operation lever. Therefore, since the monitor can be moved to a place away from the operation lever, the visibility of the monitor, the operability of the operation lever, and the habitability of the driver's cab are improved.

Moreover, since the analog signal generating means can generate a continuously changing signal which is complicated, a complicated signal (a signal suitable for theft prevention) can be obtained by only one analog signal generating means.
Can be generated. That is, the structure of the unlocking device can be simplified.

In the second invention, the operating means, the analog signal generating means for outputting an analog signal in response to the operation input of the operating means, and the analog signal output from the analog signal generating means. Con for outputting a driving control signal for driving and controlling the devices mounted in the construction machine based on the
Lock with lock and controller, the operation of the construction machine
If the lock release command signal is input, the locked state is released.
And locking means is provided on a construction machine in which, the locked state by the locking means in accordance with a predetermined operation input pattern
In unlocking system for a construction machine but to be released, the
The controller stores a constant change pattern of the analog signal output from the analog signal generating means.
And the change pattern of the analog signal output from the analog signal generation means by the operation of the operation means,
If it is determined that they match a certain change pattern stored in the memory , and if they match ,
A program that executes the processing to output the unlock command signal
I am trying to prepare it.

In the second invention, the application target is limited to the construction machine of the vehicle.

According to a third aspect of the present invention, in the second aspect, the lock means locks the operation of the engine mounted on the construction machine.

In the third aspect of the invention, the operation of the engine is normally locked and the construction machine cannot be operated. Therefore, the objects of theft prevention and the malfunction prevention at the start are achieved.

Further, in the fourth invention, in the second invention,
The locking means locks the operation of the hydraulic pump mounted on the construction machine.

In the third invention, a working machine of a construction machine is usually used,
The construction machine cannot operate because the operation of the hydraulic pump, which is the drive source that supplies pressure oil to the traveling body, etc., is locked. Therefore, the purpose of theft prevention and the malfunction prevention at the time of starting is achieved.

Further, in the fifth invention, in the second invention,
The locking means locks the operation of the traveling body of the construction machine.

In the fifth aspect of the invention, the operation of the traveling body of the construction machine is normally locked, and the construction machine cannot run by itself.
The purpose of theft prevention and the malfunction prevention at the time of starting is achieved.

According to the sixth invention, in the second invention,
The locking means locks the operation of the working machine of the construction machine.

According to the sixth aspect of the invention, the operation of the working machine of the construction machine is normally locked, and the inertial body such as the boom and the upper swing body does not operate carelessly at the time of starting. Therefore, the purpose of preventing malfunction at the time of starting is achieved, and safety is improved.

Further, in the seventh invention, in the second invention,
The operating means is a target rotation speed setting device for setting a target rotation speed of an engine mounted on a construction machine according to a setting operation, and the analog signal generating means is set by the target rotation speed setting device. It is said that the set target rotation speed detection means detects the target rotation speed.

Further, in the eighth invention, in the second invention,
The operation means is an operator that operates a work machine or a traveling body of a construction machine at a speed according to an operation amount, and the analog signal generating means is an operation amount detection means that detects an operation amount of the operator. I am trying.

Further, in the ninth invention, in the second invention,
The operating means is an operator that operates a working machine or a traveling body of the construction machine at a speed according to an operation amount, and the analog signal generating means is a working machine or a traveling machine that is operated according to an operation of the operating body. It is said to be an operating position detecting means provided on the body.

Further, in a tenth aspect based on the second aspect, the operating means is an operator for operating a working machine of the construction machine at a speed according to an operation amount, and the locking means is
It is said to lock the operation of the running body of the construction machine.

In the eleventh aspect of the invention, the operating means, the analog signal generating means for outputting an analog signal in response to the operation input of the operating means, and the analog signal output from the analog signal generating means are provided. co for outputting a driving control signal for driving and controlling the devices mounted in the construction machine based
And controller, as well as lock the operation of the construction machinery Russia
The lock state is released when the lock release command signal is input.
It provided locking means and construction machines in which is, like the lock by the lock means in accordance with a predetermined operation input pattern
In the unlocking device for a construction machine state is released, before
The controller stores a constant change pattern of the analog signal output from the analog signal generating means.
And the analog signal by operating the operating means.
Change pattern of analog signal output from generator
Matches a certain change pattern stored in the memory
From the start of the operation of the operating means.
Within the fixed time, both change patterns are made uniform by the judgment means.
When it is judged that the lock release command signal
It has a program for executing output processing .

In the eleventh invention, the lock state is not released unless both change patterns match within a predetermined time.
That is, by adding time to the second invention as a condition for unlocking, the effects of theft prevention and malfunction prevention are increased.

The twelfth aspect of the invention is to provide an operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and an analog signal output from the analog signal generating means. Con for outputting a driving control signal for driving and controlling the devices mounted in the construction machine based on the
Lock with lock and controller, the operation of the construction machine
If the lock release command signal is input, the locked state is released.
And locking means is provided on a construction machine in which, the locked state by the locking means in accordance with a predetermined operation input pattern
In unlocking system for a construction machine but to be released, the
The controller stores a constant change pattern of the analog signal output from the analog signal generating means.
And the change pattern of the analog signal output from the analog signal generation means by the operation of the operation means,
If it is determined that they match a certain change pattern stored in the memory , and if they match ,
A program that executes the processing to output the unlock command signal
And a fixed change pattern is stored in the memory.
It has a special memory switch for setting
To collect.

In the twelfth aspect of the invention, since the constant change pattern of the analog signal can be changed, the effect of preventing theft is increased.

A thirteenth aspect of the invention is to provide an operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and an analog signal output from the analog signal generating means. Con for outputting a driving control signal for driving and controlling the devices mounted in the construction machine based on the
Lock with lock and controller, the operation of the construction machine
If the lock release command signal is input, the locked state is released.
And locking means is provided on a construction machine in which, the locked state by the locking means in accordance with a predetermined operation input pattern
In unlocking system for a construction machine but to be released, the
The controller has a memory for storing a constant change pattern in which the analog signal output from the analog signal generating means repeats rising and falling at least once, and an analog output from the analog signal generating means by operating the operating means. It is determined that the change pattern of the signal matches a certain change pattern stored in the memory , and when it is determined that the change pattern matches , the unlocking finger
And a program for executing a process of outputting a command signal ,
An upper limit value of a constant change pattern stored in the memory,
There is a memory switch for setting to change the lower limit value.
It is characterized by being

In the thirteenth invention, the constant change pattern of the analog signal is a pattern in which the rising and falling are repeated at least once as shown in FIG. The constant change pattern of the analog signal is changed only by changing the upper limit values S1, S3 and the lower limit value S2 of the pattern, so that the pattern changing process is facilitated.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an unlocking device according to the present invention will be described below with reference to the drawings.

In the present embodiment, a construction machine such as a hydraulic excavator will be described, but it goes without saying that an operation signal of an accelerator pedal or the like is output as an analog signal and is used for controlling an engine, for example. It can also be applied to other vehicles.

FIG. 1 shows a structural example of a hydraulic circuit of a hydraulic excavator.

As shown in FIG. 1, in the hydraulic excavator,
The variable displacement hydraulic pump 1 is driven by using the engine 2 as a drive source, and the pilot pump 3 is driven. The target rotation speed of the engine 2 is set by setting the engine throttle 41, which is a target rotation speed setting device. The engine throttle 41 has a sensor such as a potentiometer built therein and outputs an analog signal (electrical signal) AD proportional to the throttle position set by the operator (see step 202 in FIG. 4A). The magnitude of the analog signal AD indicates the magnitude of the engine target speed. Engine throttle 41
Is operated to the minimum position, the analog signal A
D becomes 0 (%), at which time the target engine speed is 9
00 (r.p.m). On the other hand, when the engine throttle 41 is operated to the maximum position, the analog signal AD becomes 100 (%), and at this time, the engine target rotation speed is set to 2300 (rpm) (see FIG. 6). Further, the engine throttle 41 generates a sound each time one notch is operated in order to give a feeling of moderation. Therefore, as an operator, it is possible to recognize the operation position of the engine throttle 41 (set target rotation speed) by distinguishing this sound.

An analog signal AD indicating the engine target speed output from the engine throttle 41 is input to the controller 30.

As will be described later, the controller 30 drives and controls the engine 2 so that the engine target speed in accordance with the input analog signal AD indicating the throttle position can be obtained in the unlocked state. That is, the command current i is output to a governor (not shown) of the engine 2 so that an engine target speed that is proportional to the throttle position operated by the operator (the input analog signal AD) is obtained (the actual engine 2 The rotation speed is used as a feedback signal).

The pressure oil discharged from the hydraulic pump 1 is supplied to the boom hydraulic cylinder 8a for operating the boom and the arm hydraulic cylinder 8b for operating the arm via the flow control valves 7a, 7b, respectively. The swash plate position (displacement volume q (cc / rev)) of the hydraulic pump 1 is drive-controlled by the swash plate drive mechanism unit 29. In addition, the hydraulic excavator is actually provided with a hydraulic drive system for operating the upper revolving structure, the lower traveling structure, the bucket, etc. in addition to the boom and the arm, but they are omitted in the drawings for convenience of description. There is. In this specification, the boom, the arm, the bucket, and the upper swing body are referred to as a “working machine”, and the lower traveling body is referred to as a “traveling body”.

The boom operation lever 20a and the arm operation lever 20b are hydraulic operation levers (PPC levers), and the pilot pressure oil discharged from the pilot pump 3 is controlled by the pressure reducing valves 6a and 6b, respectively. After the pressure is reduced to the pilot pressure, it is applied to the input ports of the flow rate control valves 7a and 7b corresponding to the operation direction via the pilot line. The boom flow control valve 7a and the arm flow control valve 7b are each driven to have an opening area corresponding to the magnitude of the pilot pressure applied to the input port, and the pressure oil having a flow rate corresponding to the opening area is supplied to the boom. It is made to flow into the hydraulic cylinder 8a for arms and the hydraulic cylinder 8b for arms.
Therefore, the boom hydraulic cylinder 8a and the arm hydraulic cylinder 8b are respectively driven at speeds corresponding to the operation amounts of the boom operation lever 20a and the arm operation lever 20b.

Thus, the lever 20 which is the PPC lever
a and 20b use the pilot pump 3 as a drive source,
When the discharged pilot pressure oil from the pilot pump 3 is no longer supplied, the flow rate control valves 7a, 7b are not driven and the hydraulic cylinders 8a, 8b are not driven no matter how the levers 20a, 20b are operated. Therefore, the working machine moved by the hydraulic cylinders 8a and 8b is not operated.

Pilot pump 3 and levers 20a, 20
A source pressure lever 50 is arranged in the pilot line between the pressure reducing valves 6a and 6b of b. When the source pressure lever 50 is closed, the pilot pressure oil discharged from the pilot pump 3 is no longer supplied to the pressure reducing valves 6a and 6b, and the working machine is not operated no matter how the levers 20a and 20b are operated.

The original switch 44 is a switch for selecting whether or not a lock release determination program for releasing a lock, which will be described later, is required. Usually the original switch 44
Is placed in a location invisible to the operator, and is normally switched to the ON position indicating that the "lock release determination program is required". When the original switch 44 is switched to the off position, a signal indicating “no need for unlocking determination program” is input to the controller 30.

Next, with reference to FIGS. 4 (a), 4 (c) and FIG. 3, the procedure of the lock release process executed by the controller 30 will be described.

In the controller 30, basically, the processing of steps 201, 202 and 203 is followed by step 20.
The processings 7, 208, 209, 210 and 211 are executed. The lock release determination program of step 207 is shown in FIG.

First, the analog signal AD proportional to the operating position of the engine throttle 41 is operated by the operator.
Is output from the engine throttle 41 (step 2
01, 202, 203).

Next, the procedure moves to step 207,
The lock release determination program shown in FIG. 3 is executed.

Here, the constant time change pattern of the analog signal AD required for releasing the locked state is stored in advance as a pattern as shown in FIG.

That is, in this constant pattern, the AD value starts from 0% and rises until it enters the range of 50 to 60%, then falls to the range of 10 to 20%, and then 70 to 80%. Rises to within the range of 0 and then 0
It is a pattern of descending until it reaches%. If this is shown by the value of the set engine target speed, it becomes as shown in FIG.

Therefore, if the result of the operator's current operation of the engine throttle 41 matches this certain pattern, the locked state of the operation of the engine 2 is released, and the result of the operation of the engine throttle 41. However, if it does not match this fixed pattern, the locked state of the operation of the engine 2 is maintained as it is. This lock release determination program determines whether or not the result of operating the engine throttle 41 matches this fixed pattern.

In the initial state of this program, flag A, flag B, flag C, flag D, flag E, flag F, and flag G are all 0.

First, at step 101, it is determined whether or not AD> 0, that is, the target engine speed is 900.
r. p. It is determined whether or not the value is set to a value larger than m (step 101: see FIG. 6). As a result, if the AD value has risen to a value larger than 0%, the process proceeds to the next step 102, The content of the flag A indicating that the AD value has increased to a value greater than 0% is set to A = 1 (step 102).

In the next step 103, it is determined whether or not the AD value has risen into the range of 50≤AD≤60, that is, the engine target speed is 1400 r.s.r. p. 16 or more
00r. p. It is determined whether or not the range is set to m or less (step 103: see FIG. 6). As a result, if the AD value rises and enters the range of 50 ≦ AD ≦ 60,
The process proceeds to the next step 104, the AD value rises,
The content of the flag B indicating that the range of 50 ≦ AD ≦ 60 is entered is set to B = 1 (step 104).

At the next step 105, it is determined whether or not the AD value has fallen to AD ≦ 60, that is, the engine target rotational speed is 1600 rpm. p. It is determined whether or not it is set to m or less (step 105: see FIG. 6). As a result, if the AD value decreases and becomes AD ≦ 60, the process proceeds to the next step 106, the AD value decreases and A
The content of the flag C indicating that D ≦ 60 is C = 1
(Step 106).

At the next step 107, it is determined whether or not the AD value falls and enters the range of 10≤AD≤20, that is, the target engine speed is 1000 rpm. p. 12 or more
00r. p. It is determined whether or not the range is set to m or less (step 107: see FIG. 6). As a result, if the AD value falls and enters the range of 10 ≦ AD ≦ 20,
The process proceeds to the next step 108, the AD value decreases,
The content of the flag D indicating that the range of 10≤AD≤20 is entered is set to D = 1 (step 108).

In the next step 109, it is determined whether or not the AD value rises and 10≤AD, that is, the engine target speed is 1000 r.s.r. p. It is determined whether or not it is set to m or more (step 109: see FIG. 6). As a result, if the AD value rises to 10 ≦ AD, the process proceeds to the next step 110, where the AD value rises to 1
The content of the flag E indicating that 0 ≦ AD is E = 1
(Step 110).

In the next step 111, it is determined whether or not the AD value has risen to fall within the range of 70≤AD≤80, that is, the target engine speed is 2000 r.s. p. 23 or more
00r. p. It is determined whether or not the range is set to m or less (step 111: see FIG. 6). As a result, if the AD value rises and enters the range of 70 ≦ AD ≦ 80,
The process proceeds to the next step 112, the AD value increases,
The content of the flag F indicating that the range of 70 ≦ AD ≦ 80 is entered is set to F = 1 (step 112).

In the next step 113, it is determined whether or not the AD value has fallen to AD ≦ 80, that is, the engine target speed is 2300 r. p. It is determined whether or not it is set to m or less (step 113: see FIG. 6). As a result, if the AD value decreases and becomes AD ≦ 80, the process proceeds to the next step 114, the AD value decreases and A
The content of the flag G indicating that D ≦ 80 is G = 1
(Step 114).

In the next step 115, the AD value is decreased to AD = 0 (%), that is, the engine target speed is 900 r.s.r. p. It is determined whether or not m is set and the content of the flag G is 1, that is, whether or not all the throttle operations so far have been performed according to a certain pattern shown in FIG. 5 (step 115:
(See FIG. 6). As a result, when the throttle operation up to now has been performed according to a certain pattern shown in FIG. 5,
The process moves to the next step 123, and the process of releasing the locked state is executed (step 123).

If the deviation from the fixed pattern shown in FIG. 5 occurs during the throttle operation, the throttle operation performed up to that point must be restarted from the beginning until the first operation.
The contents of each flag that has been set to 0 are set to 0 (step 1
16, 117, 118, 119, 120, 121, 12
2) The locked state is held (step 124). Therefore, as the operator, the locked state will not be released unless the throttle operation is repeated from the beginning.

Note that FIG. 28 shows a program list of this lock release determination program. The correspondence between the programming language and the main processing of FIG. 3 is shown in the drawing.

As shown in FIG. 4C, when the lock release determination program determines that the lock state is to be released (YES in step 208), the engine corresponding to the input analog signal AD is input. The engine 2 is drive-controlled so that the target rotation speed is obtained.

That is, the throttle position and the command current i at which the engine target speed increases in proportion to the throttle position.
Is selected (step 209), and a command current i proportional to the current throttle position is output to the governor of the engine 2 based on this correspondence (step 211). As a result, the actual rotation speed of the engine 2 matches the target rotation speed set by the engine throttle 41.

On the other hand, when it is determined by the lock release determination program that the lock state is maintained (determination NO in step 208), the minimum engine target is set regardless of the magnitude of the input analog signal AD. Engine 2 so that the rotational speed (900 rpm) can be obtained.
Are driven and controlled.

That is, the correspondence between the throttle position and the command current i at which the target engine speed is constant at a minimum value is selected regardless of the size of the throttle position (step 210), and a constant command is issued based on this correspondence. The current i is output to the governor of the engine 2 (step 21).
1). As a result, the actual rotation speed of the engine 2 is matched with the minimum target rotation speed regardless of the setting operation of the engine throttle 41. That is, when the operation of the engine throttle 41 does not match the constant time change pattern shown in FIG. 5 (FIG. 6), the lock holding state is maintained, and the so-called low horsepower auto deceleration state is set, so the engine 2 is driven. It is not possible to fully operate the working machine and traveling body that are the source. Therefore, the purpose of preventing theft of construction machinery is achieved. In addition, the present embodiment may be applied to the purpose of preventing malfunction such as a person who does not have a driving qualification operating a construction machine and a working machine inadvertently operating.

Moreover, the engine throttle 41, which is an analog signal generator, is already provided in the construction machine for controlling the drive of the engine (governor) 2. Since the existing analog signal generator 41 is used to release the locked state, it is not necessary to provide an input device (signal generation device) such as a numeric keypad for newly releasing the locked state. Therefore, as shown in FIG. 27, it is not necessary to provide an input device (switch group 61b on the monitor 61) only for newly releasing the locked state in the narrow driver's cab 60. Since it can be moved to a place that does not hinder the operation of, the operability of the operation lever and the like is improved.

Moreover, as shown in FIG. 5 (FIG. 6), the engine throttle 41, which is an analog signal generator, has time t.
Since it is possible to generate an analog signal that changes in a complicated manner with the passage of, it is possible to generate a complicated signal (a signal suitable for theft prevention) by only operating one analog signal generator.
That is, the structure of the unlocking device can be simplified.

It is also possible to implement various modifications of the above-described embodiment. Various modifications will be described below.

In FIG. 1, the engine throttle 41 (built-in potentiometer) is used as an analog signal generator for generating the analog signal AD for unlocking, but as shown in FIG. The pressure sensor 28b that detects the pilot pressure may be used as an analog signal generator that generates an analog signal AD for unlocking. A pilot pressure sensor for detecting the operation amount of the operation lever is often already provided in the construction machine for controlling the swash plate of the hydraulic pump 1. As shown in FIG. 2, the output signal AD of the pressure sensor 28b that detects the operation amount when the arm operation lever 20b is operated in the arm dump direction is input to the controller 30. The controller 30 determines whether or not the arm operation lever 20b is operated in the arm dump direction in a constant time change pattern as shown in FIG. 5 (FIG. 7), and the operated time change pattern is shown in FIG. 7), the locked state of the operation of the engine 2 is released, and the operated time change pattern matches the constant time change pattern shown in FIG. 5 (FIG. 7). If not done (or not operated), the locked state of the operation of the engine 2 is maintained.

The controller 30 basically has the configuration shown in FIG.
Following the processing of steps 204, 205, 206 shown in (b), steps 207, 208, 209, 210, 21
The process 1 is executed. The lock release determination program in step 207 is the same as that shown in FIG. Only the processing different from the embodiment of FIG. 1 will be described.

In steps 204, 205 and 206, the pressure sensor 28b outputs an analog signal AD proportional to the operation amount of the arm operation lever 20b in the arm dump direction by the operation of the operator.

Further, a constant time change pattern of the analog signal AD required for releasing the locked state is stored in advance as a pattern as shown in FIG. This can be represented by the value of the operation amount of the operation lever 20b as shown in FIG. That is, this constant pattern is 1300 to 14 when the lever operation amount starts from the neutral position (AD value is 0%).
After increasing to the range of 00 (AD = 50 to 60%), it decreases to the range of 1000 to 1100 (AD = 10 to 20%), and then 1550 to 1650 (AD =
The pattern is such that it rises until it enters the range of 70 to 80%), and then falls until it reaches the neutral position (AD = 0%).

FIG. 29 shows a program list of the lock release judging program of FIG. Ad in the programming language
[1] indicates the lever operation amount in the arm dump direction, and
[2] indicates the lever operation amount in the arm excavation direction.
The program is such that the lock is not released unless the operation lever is operated in the arm dump direction.

As a result, the operation of the operation lever 20b is performed as shown in FIG.
If it does not match the constant time change pattern shown in (FIG. 7), the lock holding state is maintained, and the working machine and the traveling body using the engine 2 as a drive source cannot be sufficiently operated. The purpose of preventing machine theft is achieved. In addition, the present embodiment may be applied to the purpose of preventing malfunction such as a person who does not have a driving qualification operating a construction machine and a working machine inadvertently operating. In addition,
In the present embodiment, the condition for unlocking is to operate a specific operation lever (arm operation lever) of a plurality of operation levers in a specific direction (arm dump direction).

Further, although the hydraulic operation lever (PPC lever) is assumed in the present embodiment, it may be applied to a construction machine provided with an electric operation lever (EPC lever).

FIG. 16 shows an example of a structure provided with an electric lever.

As shown in FIG. 16, the electric lever 20a,
The potentiometers 25a and 25b for detecting the lever operation amount are incorporated in the 20b. An analog signal A indicating the manipulated variable from the potentiometers 25a and 25b
D is output to the controller 30 and used as a signal for unlock determination. The electric lever 20a,
A valve opening command of the flow rate control valves 7a and 7b corresponding to the operation amount of 20b is generated by the controller 30 and output as a command current to the electromagnetic proportional control valves 26a and 26b. The electromagnetic proportional control valves 26a and 26b convert the command current into a pilot pressure, which is then applied to the flow rate control valves 7a and 7b.

Note that instead of the analog signal AD obtained by operating the operation lever, the analog signal AD obtained by depressing an operation pedal (for example, a traveling pedal) may be used.

Further, in the embodiment shown in FIG. 4C, the command current (target rotation speed command) i for the engine 2 is used as a signal for unlocking or holding, but as shown in FIG. In addition, the starter command i to the starter switch 42 may be used as a signal for unlocking or holding.

That is, as shown in FIG. 16, the power source of the battery 12 is the key switch 1 to start the construction machine.
Power is supplied to the starter motor 9 via 0, and the engine 2 is started by operating the starter motor 9. Therefore, normally, the engine 2 is started by switching the switching position of the key switch 10 from the "key-on position" to the "starter position".

Therefore, in the present embodiment, the key switch 10
A starter switch 42 is newly provided on the electric signal line between the starter motor 9 and the starter motor 9. The starter switch 42 is turned on when the controller 30 outputs a starter-on command i indicating that the locked state should be released, so that the key switch 10 and the starter motor 9 can be electrically energized. . On the other hand, the controller 30
Is output by outputting a starter-off command i indicating that the locked state should be held, and the key switch 10 and the starter motor 9 are electrically disconnected.

Therefore, when the lock release determination program of the controller 30 determines that the locked state should be released, the starter switch 42 is turned on. Therefore, when the key switch 10 is switched to the starter position, the starter motor 9 is operated and the engine 2 is started. On the other hand, if the lock release determination program of the controller 30 determines that the locked state should be maintained, the starter switch 42 is turned off. Therefore, even if the key switch 10 is switched to the starter position, the starter motor 9 is not operated and the engine 2 is not started. That is, the locked state of the operation of the engine 2 is maintained.

In the unlock determination program shown in FIG. 3, no time limit is set, but in FIG.
As shown in (b), a time limit may be set using a timer.

In FIG. 8A, basically the same processing as steps 101 to 124 in FIG. 3 is executed. However, after the processing of step 102 is completed, the timer is turned on and the timer starts counting the sampling time (step 125). As a result, if the constant time change pattern shown in FIG. 5 is obtained within the predetermined count value set by the timer, for example, within 10 seconds from the start of the operation (YES at step 126), The locked state is released (step 123). On the other hand, when the count value by the timer becomes larger than the predetermined count value, that is, when the constant time change pattern shown in FIG. 5 is not obtained within 10 seconds from the start of the operation (NO at step 126). Even after 10 seconds,
Even if the constant time change pattern shown in FIG. 4 is obtained, the lock state is maintained (step 12).
4). At this time, the contents of all the flags A to G are cleared to 0 (step 127), and the count value of the timer is cleared to 0 (step 128).

As described above, in the present embodiment, if a constant time change pattern cannot be operated within a predetermined time limit,
The locked state is not released. That is, by adding a time limit as a condition for unlocking, the effects of theft prevention and malfunction prevention increase.

The time limit may be set to the time after the key switch 10 is switched to the starter position.
For example, when the constant time change pattern shown in FIG. 5 is not obtained within a predetermined time (for example, 3 seconds) after the key switch 10 is switched to the starter position, it is possible to keep the locked state. Conceivable.

Also in FIG. 8B, basically the same processing as steps 101 to 124 of FIG. 3 is executed. However, after the processing of step 115 is completed, it is determined whether the time measured by the timer is within a predetermined time range. For example, this predetermined time range is set to the daytime time range (the time range in which the work by the construction machine is performed) (step 12).
9). As a result, when the time measured by the timer is within this time range (YES at step 129),
The locked state is released (step 123). On the other hand, when the time measured by the timer is out of the predetermined time range (NO at step 129), the locked state is maintained even if the constant time change pattern shown in FIG. 5 is obtained. It remains as it is (step 124). At this time, the contents of all flags A to G are set to 0 (step 127). As described above, in the present embodiment, the locked state is not released unless it is within the time range (daytime) when the work by the construction machine is performed. Construction machines are often stolen outside the time range in which the work is performed (nighttime). Even if a person who knows a certain operation input pattern for unlocking at night (FIG. 5) operates at night, the locked state is not released, so that the effect of preventing theft is increased.

A safety condition may be added as a condition for unlocking as shown in FIG.

In FIG. 9, basically, step 101 in FIG.
The same processing as that of ~ 124 is executed. However, before starting the process of step 101, it is determined whether or not the source pressure lever 50 shown in FIG. 1 is closed (step 130).

As a result, when the source pressure lever 50 is closed (YES at step 130), the processes after step 101 are executed, but when the source pressure lever 50 is released (step 130). Judgment NO),
The locked state is unconditionally held (step 124).

That is, in the state where the source pressure lever 50 is released, the discharge pilot pressure oil from the pilot pump 3 is supplied to the pressure reducing valves 6a and 6b, and the lever 20a,
Careless operation of 20b may cause the working machine to make unexpected movements, which may lead to a dangerous state. For this reason, the lock is released in a safe state in which the source pressure lever 50 is closed.

Further, as shown in FIG. 10, the original switch 44
Whether or not to execute the lock release determination program may be determined according to the switching state of.

In FIG. 10, basically, step 10 in FIG.
The same processing as 1 to 124 is executed. However, before starting the processing of step 101, it is determined whether or not the original switch 44 shown in FIG. 1 is turned on (step 13).
1).

As a result, when the original switch 44 is turned on (determination YE in step 131).
S), the process after step 101 is executed, but when the original switch 44 is turned off (determination NO in step 131), the locked state is unconditionally released (step 123).

That is, the original switch 44 is normally on, and the locked state cannot be released without a complicated operation input (FIG. 5). Original switch 44
A person who knows the arrangement position of can switch off the original switch 44 to release the locked state without performing a complicated operation input.

In the above-described embodiment, the analog signal AD indicating the operation amount of the operation lever is used as a signal for unlocking, but as shown in FIG. 11, it is operated according to the operation of the operation lever. You may use the detection signal of the sensor which detects the operating position of a working machine as a signal for lock release.

In FIG. 11, the arm 72 is rotated in response to the operation of the arm operation lever 20b, and the rotation angle of the arm 72 is detected by the arm rotation sensor 73.
An analog signal AD indicating the rotational position of the arm 72 is output from the arm rotation sensor 73 and input to the controller 30.

In this embodiment, the object to be locked is the traveling body. The opening of the traveling flow control valve 7c is changed according to the operation amount of the traveling pedal 20c, and the traveling hydraulic motor 8 is
The flow rate supplied to c is changed. That is, the traveling hydraulic motor 8c is driven at a speed corresponding to the operation amount of the traveling pedal 20c.
Is driven and the traveling body is operated. Pilot pump 3
A traveling PPC lock switch 51, which is an electromagnetic opening / closing valve, is arranged on the pilot line between the pressure reducing valve 6c of the traveling pedal 8c. When the controller 30 applies the ON command i indicating the lock state holding to the solenoid of the traveling PPC lock switch 51, the traveling PPC lock switch 51 is switched to the ON position. Therefore, the pilot pressure oil discharged from the pilot pump 3 is not supplied to the pressure reducing valve 6c, and the traveling motor 8c is not driven and the traveling body does not operate regardless of the operation of the traveling pedal 20c. That is, the locked state of the traveling body is maintained. On the other hand, when the controller 30 applies the OFF command i indicating the unlocked state to the solenoid of the traveling PPC lock switch 51, the traveling PPC lock switch 51 is switched to the off position. Therefore, the pilot pump 3
Pilot pressure oil discharged from is supplied to the pressure reducing valve 6c, the traveling motor 8c is driven at a speed corresponding to the operation amount of the traveling pedal 20c, and the traveling body is operated.
That is, the locked state of the traveling body is released.

FIG. 12 shows the processing performed by the controller 30.

The controller 30 basically has the configuration shown in FIG.
A process similar to the process shown in is executed.

First, the operator operates the arm operation lever 2
With the operation of 0b, an analog signal AD proportional to the rotation angle of the arm 72 is output from the arm rotation sensor 73 (steps 301, 302, 303).

Next, the procedure moves to step 304,
The lock release determination program shown in FIG. 3 (or FIGS. 8, 9, and 10) is executed.

Here, a constant time change pattern of the analog signal AD required for releasing the locked state is stored in advance as a pattern as shown in FIG.

As a result, when the time change pattern of the output AD of the arm rotation sensor 73 accompanying the operation of the arm operation lever 20b does not match the constant time change pattern shown in FIG. It is maintained (NO in step 305, step 307). That is,
An on command i indicating that the controller 30 holds the locked state
Is added to the solenoid of the traveling PPC lock switch 51, and the traveling PPC lock switch 51 is switched to the ON position. Therefore, the pilot pressure oil discharged from the pilot pump 3 is not supplied to the pressure reducing valve 6c, and the traveling motor 8c is not driven and the traveling body does not operate regardless of the operation of the traveling pedal 20c. In this state, the construction machine cannot be self-propelled, so the purpose of preventing theft is achieved.

On the other hand, when the time change pattern of the output AD of the arm rotation sensor 73 accompanying the operation of the arm operation lever 20b matches the constant time change pattern shown in FIG. 5, the locked state is released ( YES in step 305, step 306). That is, the off command i indicating the unlocked state is issued from the controller 30 to the traveling PPC.
It is added to the solenoid of the lock switch 51 and runs PP
The C lock switch 51 is switched to the off position. Therefore, the pilot pressure oil discharged from the pilot pump 3 is supplied to the pressure reducing valve 6c, the traveling motor 8c is driven at a speed corresponding to the operation amount of the traveling pedal 20c, and the traveling body is operated.

In the embodiments shown in FIGS. 11 and 12, the traveling body is the object of locking, but the working machine may be the object of locking. For example, a lock switch 51 similar to that shown in FIG. 11 is provided on the pilot line for supplying pilot pressure oil to the operating lever for the working machine, and if there is no constant operation input (FIG. 5), the working machine is locked. It is possible to maintain it. In this case, if there is no constant operation input, the work machine does not operate even if the work machine operation lever is operated, so a malfunction that the work machine is inadvertently operated by the operation of a person who is not qualified. Is prevented.

Now, in order to prevent crime, it is desirable to periodically change the constant time change pattern (FIG. 5) of the analog signal AD required for unlocking. Further, when the construction machine is shipped, the constant time change pattern (FIG. 5) of the analog signal AD is set and stored in the memory in the controller 30.

It is desirable that the process of changing and setting the pattern be easily performed with a simple configuration. Next, an embodiment that can meet this demand will be described.

FIG. 13 shows an example of the configuration of the controller 30 for performing pattern setting or changing processing.
In this embodiment, a case where a pattern is set or changed by using an analog signal AD output from the engine throttle 41 will be described.

The analog signal AD output from the engine throttle 41 is converted into a digital signal by the A / D converter 33 and input to the CPU 31. The memory switch 34 is arranged at a position where the operator cannot easily operate it, and cannot be operated unless a special key is used. Usually, when a construction machine is shipped or when an operation input pattern required for unlocking is forgotten, a specific person (service person) turns on the memory switch 34 to set or change the operation input pattern.

The CPU 31 executes the processing indicated by 15 to newly generate a fixed operation input pattern required for unlocking, and the fixed operation input pattern is stored in the memory 32.
Memorized in. The fixed operation input pattern stored in the memory 32 is used for the actual unlock determination.

In this embodiment, as shown in FIG.
The constant time change pattern of the analog signal AD is the time t
The pattern is such that ascending and descending are repeated at least once according to the progress of. Then, a new pattern is set or changed by performing a process of giving the upper limit values S1, S3 and the lower limit value S2 of this pattern.

As shown in FIG. 15, first, it is determined whether the memory switch 34 has been turned on (step 4).
25). Here, when setting or changing a new pattern, the memory switch 34 is turned on, and the procedure moves to the next step 426.

In the initial state, the flags flg1 and flg are set.
The contents of 2, flg3, and flgE are set to 0, the contents of the flag flgC are set to 0, and S
The value of 1 is set to the minimum number 0, and the value of S2 is the maximum number 100.
Set to 0 and set to 0, and the value of S3 is set to the minimum number 0. Here, the flag flgC is a flag indicating from the start to the end of the setting process of the values of S1, S2, and S3. f
lgE is a flag indicating the end of setting the values of S1, S2, and S3. The flag flg1 is a flag indicating the end of setting the value of S1. The flag flg2 is a flag indicating the end of setting the value of S2. The flag flg3 is a flag indicating the end of setting the value of S3.

Next, it is determined whether the flag flgC is 1 (step 426). In the initial state, the flag flgC = 0, so the procedure moves to step 430, and the content of the flag flgC is set to 1, and then moves to step 427.

Next, it is determined whether the flag flgE is 1 (step 427). Since the flag flgE = 0 in the initial state, the procedure moves to step 433, and the process of setting the values of S1, S2, and S3 is executed.

If the throttle 41 is not operated, the procedure goes to step 447 to set the flags flg1 and fg.
The contents of lg2, flg3, and flgE remain 0 (step 447), and the procedure shifts to step 425 again.

When the operator operates the throttle 41 to increase the operation amount from the minimum position in order to give a new operation input pattern, the time differential value d of the analog signal AD.
AD / dt takes a positive value, and the judgment in step 443 is Y.
It becomes ES. While the operation amount of the throttle 41 is increasing, S1 <AD (YES in step 444), and the value of S1 is sequentially updated with the current AD value (step 445). When the manipulated variable of starts to decrease (NO in step 444), S1
Is updated, the upper limit value AD at that time is set to the value of S1, and then the procedure proceeds to step 446. In step 446, the content of the flag flg1 is changed to 1 as the setting of the value of S1 is completed (step 446).

Thereafter, the setting process of the value of S2 is performed in the same manner, and the flag fl is considered to indicate that the setting of the value of S2 is completed.
The content of g2 is changed to 1 (steps 439 to 44).
2).

Further, similarly, the setting process of the value of S3 is performed, and it is determined that the setting of the value of S3 is completed, and the flag fl is set.
The content of g3 is changed to 1 (steps 435 to 43)
8).

If the content of the flag flg3 is 1 (YES at step 433), S1 and S
The flag flg indicates that the setting of the values of 2 and S3 is completed.
The content of E is changed to 1 (step 434).

As a result, the judgment in step 427 is YES.
Therefore, the set values of S1, S2, and S3 are written in the memory 32 (for example, a flash memory is used) (step 428), and the storage is terminated (step 429).

Storage processing of new operation input pattern (S
When the storage processing of S1, S2, S3) is completed, the storage switch 34 is turned off (NO at step 425), and the set values S1, S2, S stored in the memory 32 are stored.
3 is read (step 431), the flag flgC is set to 0 (step 432), and the contents of the lock release determination program are rewritten (steps 401 to 4).
24).

The steps 401 to 424 correspond to the steps 101 to 124 in FIG. That is, 50 ≦ AD ≦ 60 in step 103 is S1-5 ≦ AD ≦ S1.
It is changed (set) to +5 (step 403). For example, if the value of S1 is 25, it is changed (set) to 20 ≦ AD ≦ 30.

Similarly, when AD ≦ 60 in step 105,
It is changed (set) to AD ≦ S1 + 5 (step 40
5), and 10 ≦ AD ≦ 20 in step 107 is S
2-5 ≦ AD ≦ S2 + 5 is changed (set) (step 407), and 10 ≦ AD in step 109 is S2.
It is changed (set) to −5 ≦ AD (step 409), and 70 ≦ AD ≦ 80 in step 111 is changed to S3-5 ≦.
It is changed (set) to AD ≦ S3 + 5 (step 41
1), and AD ≦ 80 in step 113 is AD ≦ S
It is changed (set) to 3 + 5 (step 413).

In this way, the setting process or the changing process of the constant time change pattern of the analog signal AD for releasing the lock state is facilitated.

Note that FIG. 30 shows a program list in which the processing shown in FIG. 15 is described in a programming language. The correspondence between the main processing of FIG. 15 and the programming language is shown in the drawing.

Hereinafter, an example of application to a construction machine will be further described.

In FIG. 17, the output signal of the engine throttle 41 is used as an analog signal AD for determining the lock release to unlock the operation of a plurality of working machines (or both working machines and traveling bodies). 2 shows an embodiment for doing so.

In this embodiment, each operation lever 20a,
An electromagnetic opening / closing valve 24 similar to the lock switch 51 of FIG. 11 is provided on the pilot line 23 between the pressure reducing valves 6 a, 6 b, 6 c of 20 b and 20 c and the pilot pump 3.

Therefore, when the time change pattern of the output AD of the throttle 41 does not match the constant time change pattern shown in FIG. 5, the controller 30 issues the closing command i indicating the lock state hold. The solenoid opening / closing valve 24 is switched to the lock holding position. Therefore, the pilot pressure oil discharged from the pilot pump 3 is not supplied to the pressure reducing valves 6a to 6c, and the hydraulic cylinders 8a and 8b and the hydraulic motor 8c are not driven regardless of the operation of the operating levers 20a to 20c. Multiple implements (or both implements and vehicles)
Does not work.

On the other hand, when the time change pattern of the output AD of the throttle 41 coincides with the constant time change pattern shown in FIG. 5, the controller 30 issues an open command i indicating the unlocked state to the solenoid of the electromagnetic opening / closing valve 24. In addition, the electromagnetic opening / closing valve 24 is switched to the unlocked position. Therefore, the pilot pressure oil discharged from the pilot pump 3 is supplied to the pressure reducing valves 6a to 6c, and the hydraulic cylinders 8a and 8b and the hydraulic motor 8c are moved at a speed corresponding to the operation amount of the operation levers 20a to 20c. Is driven and each work machine (or both the work machine and the traveling body) is operated.

FIG. 18 shows an operation lever 2 which is an electric lever.
An embodiment in which the output electric signal V of 0a, 20b, 20c is used as an analog signal AD for lock release determination, and the opening command i for each of the flow rate control valves 7a to 7c is used as a signal of a lock holding command and a release command. Is shown.

The processing performed by the controller 30 is shown in FIG.
Shown in.

That is, for example, the process of FIG. 19 is executed subsequent to the process of step 208 of FIG. 4C, and, for example, the time change pattern of the output AD of the operation lever 20b becomes the constant time change pattern shown in FIG. If not, the correspondence between the lever operation amount V and the valve opening command i that minimizes the valve opening amount is selected (NO in step 501, step 503). That is, the valve opening command i that minimizes the valve opening amount from the controller 30 regardless of the lever operation amount V is the electromagnetic proportional control valve 26a.
26c to each solenoid (step 50)
4). Therefore, the opening amounts of the flow rate control valves 7a to 7c are minimized, and the hydraulic cylinders 8a and 8b and the hydraulic motor 8c are not driven regardless of the operation of the operation levers 20a to 20c, and the working machines (working machine and working machine and The vehicle does not work.

On the other hand, when the time change pattern of the output AD of the operation lever 20b matches the constant time change pattern shown in FIG. 5, the valve operation amount V increases as the lever operation amount V increases. And the valve opening command i are selected (YES in step 501).
S, step 502). That is, the valve opening command i, which is the valve opening amount corresponding to the lever operation amount V, is applied from the controller 30 to each solenoid of the electromagnetic proportional control valves 26a to 26c (step 504). Therefore, the opening amount of each of the flow rate control valves 7a to 7c increases according to the magnitude of the lever operation amount V, and the hydraulic cylinders 8a and 8b and the hydraulic motor 8 are moved at a speed corresponding to the operation amount of each operation lever 20a to 20c.
c is driven and each work machine (work machine and traveling body) is operated.

Further, the hydraulic pump 1 may be the object of locking. In the hydraulic pump control system by the positive control, the swash plate drive mechanism unit 29 of the hydraulic pump 1 is provided with respect to the swash plate drive mechanism unit 29 of the hydraulic pump 1 so that the pump displacement volume q (cc / rev) proportional to the operation amount (request flow rate) of the operation lever is obtained. The command i is output. The swash plate command i to the swash plate drive mechanism 29 may be used as a lock holding command and a release command signal.

In this case, the controller 30 operates as shown in FIG.
The process shown in is executed.

That is, for example, the process of FIG. 20 is executed subsequent to the process of step 208 of FIG. 4C, and the time change pattern of the output AD of the operating lever 20b becomes the constant time change pattern shown in FIG. 5, for example. If not, the correspondence relationship between the lever operation amount and the swash plate command i that minimizes the pump displacement volume q is selected (NO in step 601; step 603). That is, the swash plate command i that minimizes the pump displacement volume q is output from the controller 30 to the swash plate drive mechanism unit 29 regardless of the amount of lever operation (step 604). Therefore, the swash plate of the hydraulic pump 1 is set to the minimum position, and the minimum amount (0) of the pressure oil is supplied to the hydraulic cylinders 8a and 8b and the hydraulic motor 8c regardless of the operation of the operation levers 20a to 20c. Without each work machine (work machine and traveling body)
Does not work.

On the other hand, when the time change pattern of the output AD of the operation lever 20b coincides with the constant time change pattern shown in FIG. 5, the lever operation amount is such that the pump displacement volume q increases in proportion to the lever operation amount. The correspondence with the swash plate command i is selected (YES at step 601, step 602). That is, the controller 30 outputs to the swash plate drive mechanism unit 29 the swash plate command i for obtaining the pump displacement volume q proportional to the lever operation amount (step 604). Therefore, each operation lever 20a-
A flow rate corresponding to the required flow rate of 20c is supplied from the hydraulic pump 1 to the hydraulic cylinders 8a and 8b and the hydraulic motor 8c, and each work machine (work machine and traveling body) is operated.

Next, FIG. 21 shows an embodiment in which the traveling body is to be locked by using a signal indicating the amount of operation of the operating lever for the working machine as an analog signal AD for determining unlocking. ing.

In this embodiment, the pressure reducing valve 6c for the traveling pedals (left traveling pedal, right traveling pedal) 20c1, 20c2 is used.
On the pilot line between the 1 and 6c2 and the flow control valves 7c1 and 7c2, electromagnetic opening / closing valves 24a and 24b similar to the lock switch 51 of FIG. 11 are provided. The pilot pressures output from the pressure reducing valves 6a, 6b, 6d of the work machine operating levers 20a, 20b, 20d are pressure sensors 28a, 28.
It is detected by b and 28d and input to the controller 30.

Therefore, for example, when the time change pattern of the output AD of the pressure sensor 28b does not match the constant time change pattern shown in FIG. 5, the controller 30
From the electromagnetic shutoff valve 24
solenoid valves 24a, 24b added to each solenoid
a and 24b are switched to the lock holding position. Therefore, the pilot pressure oil output from the pressure reducing valves 6c1 and 6c2 of the traveling pedals is not supplied to the traveling flow rate control valves 7c1 and 7c2, and the traveling hydraulic motors are irrespective of the operation of the traveling pedals 20c1 and 20c2. 8c1 and 8c2 are not driven and the running body does not operate.

On the other hand, when the time change pattern of the output AD of the pressure sensor 28b coincides with the constant time change pattern shown in FIG. 5, the controller 30 issues the open command i indicating the unlocked state to the electromagnetic opening / closing valves 24a, 24b. The solenoid valves 24a and 24b are switched to the unlocked position. Therefore, the running pedal 20c
Pilot pressure oil output from the pressure reducing valves 6c1 and 6c2 of 1 and 20c2 is supplied to the flow rate control valves 7c1 and 7c2 for traveling, so that the traveling speed can be adjusted according to the operation amount of the pedals 20c1 and 20c2. The hydraulic motors 8c1 and 8c2 are driven to operate the traveling body.

Further, it may be applied when the swash plate of the hydraulic pump 1 is controlled by a negative control system (negative control). In the hydraulic pump control system using the negative control, as shown in FIG. 22, the flow rate discharged from the center bypass passage 32 to the tank is detected by the differential pressure across the fixed throttle 33, that is, the differential pressure across the pressure is detected by the pressure sensors 34a and 34b. When the differential pressure is detected, the discharge amount q of the hydraulic pump 1 is increased, and when the differential pressure across the hydraulic pump 1 is increased, the hydraulic pump 1 is increased.
The controller 30 outputs a swash plate command i to the swash plate drive mechanism unit 29 so as to reduce the discharge amount q of. As a result, the differential pressure across the fixed throttle 33 is kept constant, and the flow rate discharged to the tank is kept constant.

In the embodiment shown in FIG. 22, the swash plate command i to the swash plate drive mechanism unit 29 is used as a signal for the lock holding command and the unlock command.

That is, for example, the process of FIG. 23 is executed subsequent to the process of step 208 of FIG. 4C, and, for example, the time change pattern of the output AD of the operation lever 20b becomes the constant time change pattern shown in FIG. If not done, the throttle 33 that minimizes the pump displacement volume q
The correspondence between the front-back differential pressure and the swash plate command i is selected (NO in step 701, step 703). That is, the controller 30 outputs the swash plate command i that minimizes the pump displacement volume q to the swash plate drive mechanism 29 regardless of the magnitude of the differential pressure across the fixed throttle 33 (step 704). For this reason, the swash plate of the hydraulic pump 1 is set to the minimum position, and regardless of the operation of the operating levers 20a and 20b, only a minimum amount of pressure oil is supplied to the hydraulic cylinders 8a and 8b, and the working machines do not operate. .

On the other hand, when the time change pattern of the output AD of the operation lever 20b matches the constant time change pattern shown in FIG. 5, the pump displacement volume q becomes smaller as the differential pressure across the throttle 33 becomes larger. The corresponding relationship between the front-back differential pressure 33 and the swash plate command i is selected (YES in step 701, step 702). That is, the controller 30 outputs the swash plate command i for obtaining the pump displacement volume q according to the differential pressure across the fixed throttle 33 to the swash plate drive mechanism unit 29 (step 704). For this reason,
Since the hydraulic pump 1 operates to increase the discharge amount q so as to compensate for the decrease in the differential pressure across the fixed throttle 33 according to the increase in the spool stroke amount of the flow amount control valves 7a and 7b, the flow amount control valve 7a , 7b are supplied to the hydraulic cylinders 8a and 8b according to the spool stroke amounts, and control is performed so that each working machine is operated.

Although the fixed diaphragm 33 is used in the embodiment shown in FIG. 22, the fixed diaphragm 33 is used as a variable diaphragm, and a command for changing the opening area of the variable diaphragm is used as a signal for a lock holding command and a release command. Good.

Further, it may be applied when the swash plate of the hydraulic pump 1 is controlled by the load sensing method. In the hydraulic pump control method using the load sensing method,
As shown in FIG. 4, the maximum load pressure of the hydraulic cylinders 8a and 8b in operation is detected as the outflow pressure of the shuttle valve, and the discharge pressure of the hydraulic pump 1 is always higher than this maximum load pressure by a predetermined differential pressure. The swash plate drive mechanism unit 29 drives the swash plate of the hydraulic pump 1 so that When the maximum load pressure increases, the pump discharge amount q increases, and when the maximum load pressure decreases, the pump discharge amount q decreases.

In the embodiment shown in FIG. 24, the electromagnetic opening / closing valve 35 is provided on the pilot line for applying the maximum load pressure as the pilot pressure to the swash plate drive mechanism section 29. The opening / closing command output from the controller 30 to the electromagnetic opening / closing valve 35 is used as a signal for the lock holding command and the unlocking command.

Therefore, for example, when the time change pattern of the output AD of the operation lever 20b does not match the constant time change pattern shown in FIG. 5, the closing command i is output to the electromagnetic opening / closing valve 35. Therefore, the electromagnetic opening / closing valve 35 is positioned at the lock holding position, the pilot pressure oil showing the maximum load pressure is drained, and the pilot pressure oil showing the maximum load pressure minimum (maximum load pressure 0) is sent to the swash plate drive mechanism section 29. Is added, the swash plate of the hydraulic pump 1 is driven so that the pump discharge amount q is minimized.

On the other hand, when the time change pattern of the output AD of the operation lever 20b matches the constant time change pattern shown in FIG. 5, the opening command i is output to the electromagnetic opening / closing valve 35. Therefore, the electromagnetic opening / closing valve 35 is located at the unlocked position, and the pilot pressure oil indicating the maximum load pressure is applied to the swash plate drive mechanism portion 29, so that the discharge pressure of the hydraulic pump 1 is higher than the maximum load pressure by the predetermined value. The swash plate of the hydraulic pump 1 is driven by the swash plate drive mechanism unit 29 so that the pressure difference is always increased.

In the embodiment shown in FIG. 24, the maximum load pressure is reduced and the lock holding state is maintained. However, the discharge pressure of the hydraulic pump 1 applied to the swash plate drive mechanism 29 is increased. The lock holding state may be set. In addition, the discharge amount q of the hydraulic pump 1 in the lock holding state
The swash plate drive mechanism unit 29 may be configured so that

FIG. 26 shows an embodiment in which the hydraulic pump 1 is locked. The processing performed by the controller 30 is shown in FIG.

In the embodiment shown in FIG. 26, the hydraulic pump 1
In addition to the relief valve 38, a variable bleed valve 39 is provided on the discharge pressure oil supply path. The opening command i for changing the opening area of the variable bleed valve 39 is used as a signal for the lock holding command and the unlocking command.

That is, for example, the process of FIG. 25 is executed subsequent to the process of step 208 of FIG. 4C, and the time change pattern of the output AD of the operating lever 20b becomes the constant time change pattern shown in FIG. 5, for example. If not, the correspondence between the lever operation amount and the opening command i that maximizes the opening area of the variable bleed valve 39 is selected (NO in step 801; step 803). That is, from the controller 30, the operation levers 20a, 20
Variable bleed valve 39 regardless of the amount of operation of b
The opening command i that maximizes the opening area of the variable bleed valve 3
9 (step 804). Therefore, regardless of whether the operating levers 20a and 20b are operated, the hydraulic fluid discharged from the hydraulic pump 1 remains drained, and the working machines do not operate.

On the other hand, when the time change pattern of the output AD of the operation lever 20b matches the constant time change pattern shown in FIG. 5, the opening area of the variable bleed valve 39 decreases as the lever operation amount increases. The correspondence between the manipulated variable and the opening command i is selected (step 80).
The judgment of 1 is YES, step 802). That is, the controller 30 outputs to the variable bleed valve 39 an opening command i for obtaining an opening area corresponding to the amount of operation of the operation levers 20a and 20b (step 804). For this reason, the pump discharge pressure oil whose drain amount decreases according to the operation amount of each operation lever 20a, 20b is the hydraulic cylinder 8.
a, 8b, and each work machine is operated. In addition,
In the embodiment shown in FIG. 26, the opening area of the variable bleed valve 39 is increased to achieve the lock holding state. However, without providing the variable bleed valve 39, the pilot pressure is applied to the side of the relief valve 38 facing the spring. In addition, the relief valve 38
It is also possible to increase the drain amount of the pump discharge pressure oil by lowering the set relief pressure to realize the lock holding state.

Further, in the above-described embodiment, FIG.
~ As shown in FIG. 7, the operation signal A changes with the passage of time t.
D is in the range of 50 to 60% → in the range of 10 to 20% → 70
Although the changing time change pattern is set in the order of -80%, it is possible to implement the order in any order. That is, as a constant operation signal change pattern, “50 to 60% range, 10 to 20% range, 70
"The pattern in which the operation signal reaches the range of ~ 80%" is set, and in any order, the actual operation signal of the engine throttle, etc. It is also possible to release the locked state by sequentially reaching the "range, 70-80% range". That is, the range of 50-60% → 10-20%
Range → not only the order of 70-80% range,
50 to 60% range → 70 to 80% range → 10 to 20
% Order, 10-20% range → 70-80
% Range → 50-60% range, 10-20
% Range → 50-60% range → 70-80% range, 70-80% range → 10-20% range →
Order of 50-60% range, 70-80% range →
The lock state may be released when the operation signal of the engine throttle, the operation lever, or the like changes in any order such as the range of 50 to 60% → the range of 10 to 20%.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of an embodiment of the present invention.

FIG. 3 is a flowchart showing a lock release determination program.

FIG. 4 (a), (b), (c) is FIG. 1 or FIG.
5 is a flowchart showing a procedure of processing executed by the controller shown in FIG.

FIG. 5 is a diagram showing a constant time change pattern of an operation input used for determining unlocking.

FIG. 6 is a view showing a constant time change pattern of an engine throttle operation input used for determining unlocking.

FIG. 7 is a diagram showing a constant time change pattern of a lever operation input used to determine unlocking.

8A and 8B are flowcharts showing a modified example of the lock release determination program shown in FIG.

FIG. 9 is a flowchart showing a modification of the lock release determination program shown in FIG.

FIG. 10 is a flowchart showing a modification of the lock release determination program shown in FIG.

FIG. 11 is a hydraulic circuit diagram of an embodiment of the present invention.

12 is a flowchart showing a procedure of processing executed by the controller shown in FIG.

FIG. 13 is a block diagram showing a configuration for changing a constant time change pattern of an operation input.

FIG. 14 is a diagram showing an upper limit value and a lower limit value of a constant time change pattern of an operation input.

FIG. 15 is a flowchart showing a procedure of pattern changing processing executed by the CPU shown in FIG.

FIG. 16 is a hydraulic circuit diagram showing an embodiment in which an engine is locked.

FIG. 17 is a hydraulic circuit diagram showing an embodiment in which a working machine and a traveling body are locked.

FIG. 18 is a hydraulic circuit diagram showing an embodiment in which a command applied to an electromagnetic proportional control valve is used as a lock holding and releasing signal.

19 is a flowchart showing a main part of a process performed by the controller shown in FIG.

FIG. 20 is a flowchart showing a main part of a process when applied to a hydraulic pump control system using a positive control.

FIG. 21 is a hydraulic circuit diagram showing an embodiment in which a traveling body is held or released in a locked state in response to an input of an operating lever for a working machine.

FIG. 22 is a hydraulic circuit diagram showing an embodiment applied to a hydraulic pump control system by a negative control.

23 is a flowchart showing a main part of a process performed by the controller shown in FIG.

FIG. 23 is a flowchart showing an embodiment applied to a hydraulic pump control system by load sensing.

25 is a flowchart showing a main part of a process performed by the controller shown in FIG.

FIG. 26 is a hydraulic circuit diagram of an embodiment in which a hydraulic pump is a lock target.

FIG. 27 is a diagram illustrating an arrangement mode of a monitor in a driver's cab.

FIG. 28 is a program list of the process shown in FIG.

FIG. 29 is a program list for releasing the locked state when the arm operation lever is operated in a fixed operation input pattern in the arm dump direction.

FIG. 30 is a program list of the pattern changing process shown in FIG.

[Explanation of symbols]

1 hydraulic pump 2 engine 3 pilot pump 7a-7d hydraulic actuator 20a-20d operating lever 28a-28d Pressure sensor 30 controller 41 engine throttle 44 yuan switch 50 source pressure switch 51 Travel PPC lock switch 72 arms 73 Arm rotation sensor

Claims (13)

(57) [Claims] 1. An operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and a device mounted on a vehicle based on the analog signal output from the analog signal generating means. and a controller for outputting a driving control signal for driving and controlling, the lock release command signal with locking the operation of the vehicle input
The locking means and the vehicle body which lock state is released when
In a vehicle unlocking device that is provided inside and unlocks a locked state by the locking means according to a constant operation input pattern, the controller is configured to change the analog signal generated from the analog signal generating means by a constant change pattern. a memory for storing the change pattern of the analog signal output from said analog signal generating means by the operation of said operating means, said main
When it is determined that they match the constant change pattern stored in the memory, it is determined that they coincide, the lock
An unlocking device for a vehicle, comprising: a program that executes a process of outputting a release command signal . 2. An operating means, an analog signal generating means for outputting an analog signal according to an operation input of the operating means, and a device mounted on a construction machine based on the analog signal output from the analog signal generating means. A controller that outputs a drive control signal to drive and control the operation of the construction machine and an unlock command signal
Locking means to release the locked state when is input
In the unlocking device for a construction machine, the controller is provided in the construction machine, and the locked state by the locking means is released according to a constant operation input pattern. a memory for storing a predetermined change pattern of the analog signal output, the change pattern of the analog signal output from said analog signal generating means by the operation of said operating means, said main
When it is determined that they match the constant change pattern stored in the memory, it is determined that they coincide, the lock
An unlocking device for a construction machine, comprising: a program that executes a process of outputting a release command signal . 3. The lock means locks the operation of an engine mounted on a construction machine.
The unlocking device for the construction machine described. 4. The unlocking device for a construction machine according to claim 2, wherein the locking means locks an operation of a hydraulic pump mounted on the construction machine. 5. The unlocking device for a construction machine according to claim 2, wherein the lock means locks an operation of a traveling body of the construction machine. 6. The unlocking device for a construction machine according to claim 2, wherein the lock means locks an operation of a working machine of the construction machine. 7. The operating means is a target rotation speed setting device for setting a target rotation speed of an engine mounted on a construction machine according to a setting operation, and the analog signal generating means includes the target rotation speed. The lock release device for a construction machine according to claim 2, which is a set target revolution number detecting means for detecting the target revolution number set by the setter. 8. The operation means is an operator for operating a work machine or a traveling body of a construction machine at a speed according to an operation amount, and the analog signal generating means is an operation for detecting an operation amount of the operator. The unlocking device for a construction machine according to claim 2, which is a quantity detecting means. 9. The operating means is an operator that operates a working machine or a traveling body of a construction machine at a speed according to an operation amount, and the analog signal generating means is operated according to an operation of the operator. The unlocking device for a construction machine according to claim 2, which is an operating position detecting means provided on the working machine or the traveling body. 10. The operating means is an operator that operates a working machine of the construction machine at a speed according to an operation amount, and the locking means locks the operation of a traveling body of the construction machine. The unlocking device for a construction machine according to 2. 11. An operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and a device mounted on a construction machine based on the analog signal output from the analog signal generating means. A controller that outputs a drive control signal for driving and controlling
Locks the operation of construction machinery and unlocks
And a lock means for releasing the lock state when a number is input, and the lock state of the construction machine is released according to a certain operation input pattern. In the releasing device, the controller stores the constant change pattern of the analog signal output from the analog signal generating means, and the analog signal generating means by operating the operating means.
The change pattern of the analog signal output from the
It must match a certain change pattern stored in the memory.
Within a predetermined time from the start of operation of the operation means
Both change patterns are matched by the judging means
If it is determined that the lock release command signal is output,
An unlocking device for construction machinery, which has a program that executes a process . 12. An operating means, an analog signal generating means for outputting an analog signal according to an operation input of the operating means, and a device mounted on a construction machine based on the analog signal output from the analog signal generating means. A controller that outputs a drive control signal for driving and controlling
Locks the operation of construction machinery and unlocks
And a lock means for releasing the lock state when a number is input, and the lock state of the construction machine is released according to a certain operation input pattern. In the releasing device, the controller stores a constant change pattern of the analog signal output from the analog signal generating means, and a change pattern of the analog signal output from the analog signal generating means by operating the operating means. There, the eye
When it is determined that they match the constant change pattern stored in the memory, it is determined that they coincide, the lock
And a program for executing processing for outputting a release command signal
In order to store a certain change pattern in the memory,
A lock release device for construction machinery, which is equipped with a memory switch . 13. An operating means, an analog signal generating means for outputting an analog signal in response to an operation input of the operating means, and a device mounted on a construction machine based on the analog signal output from the analog signal generating means. A controller that outputs a drive control signal for driving and controlling
Locks the operation of construction machinery and unlocks
And a lock means for releasing the lock state when a number is input, and the lock state of the construction machine is released according to a certain operation input pattern. In the releasing device, the controller stores a constant change pattern in which the analog signal output from the analog signal generating means repeats rising and falling at least once, and the analog signal generating means by operating the operating means. change pattern of the analog signal output from the said main
When it is determined that they match the constant change pattern stored in the memory, it is determined that they coincide, the lock
And a program for executing processing for outputting a release command signal
Comprising, an upper limit value of the constant change pattern stored in the memory,
There is a memory switch for setting to change the lower limit value.
An unlocking device for construction machinery.