JP2006256443A - Notification device of body elevating state for dump truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a notification device of a body elevating state for a dump truck which can accurately notify a body elevating state to an operator and obtain an appropriate body elevation having no shock by an operator's operation irrespective of the weight or the state of loading object on the body. <P>SOLUTION: The notification device of the body elevating state is equipped with an operating degree detection means (42, 44) detecting the operating degree of an operation means (41, 43), a body posture detection means (46) detecting the posture of the body (4) relative to a vehicle frame (2), and a notification means (40, 48) which notifies the body elevating state based on the operating degree of the operation means detected by the operating degree detection means, and the body posture detected by the body posture detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dump truck body raising / lowering state notification device for notifying an operator of the body state when the body is raised and lowered, and particularly suitable for a dump truck body raising and lowering when the weight and state of the load on the body are not constant. The present invention relates to a status notification device.

  The dump truck is equipped with a body for loading earth and sand, stones, etc. on the vehicle body. Normally, the rear part of the body is rotatably supported at the rear end of the vehicle body, and the front part of the body can be moved up and down by a hydraulic cylinder. Supported and configured. Thus, in the dump truck, the operator of the dump truck can raise or lower the operation lever to extend and retract the hydraulic cylinder, and the body can be lifted and lowered with the rear end of the vehicle body as a fulcrum.

By the way, in the case of a large dump truck in particular, when the operator operates the operation lever as described above to raise and lower the body, that is, to stand and sit, it is visually recognized how the body is raised and lowered from the dump truck driver's seat. In many cases, this is not possible, and there is a problem that when the body stands or sits down, the body suddenly stops at the movable end and an impact is generated.
For this reason, for example, when the descending speed of the body is different from the set speed, the contraction speed of the hydraulic cylinder is corrected, and the impact when sitting on the body is reduced without being affected by the change in the viscosity of the return oil of the hydraulic cylinder. The technique which does is developed (refer patent document 1 etc.).

Further, for example, when the hydraulic pressure in the hydraulic cylinder or the rotation around the fulcrum shaft of the body is detected and it is determined that the body is close to the standing posture based on the change in the hydraulic pressure or the rotation, the oil supply amount to the hydraulic cylinder is reduced. A technique has been developed in which the degree of opening of the electromagnetic valve to be adjusted is controlled and the output pressure of the electromagnetic valve is adjusted to a low pressure (see Patent Document 2, etc.).
JP 2002-89508 A JP 2001-105956 A

  However, when the body is standing up, it is significantly different from the seating state when the body is empty, and the hydraulic pressure required according to the weight of the load or according to the state of the load (for example, the degree of adhesion of the load) The hydraulic pressure in the cylinder is not necessarily constant. For example, even if the technique disclosed in Patent Document 1 is applied when the body is standing up, it is difficult to set the set speed on the ascending side of the body. However, since the ascending speed is not constant, the extension speed of the hydraulic cylinder is constantly corrected, and there is a problem that the control becomes extremely complicated.

Further, in the technique disclosed in Patent Document 2, it is determined that the body is close to a standing posture based on a change in the hydraulic pressure in the hydraulic cylinder. However, as described above, the weight of the load or the state of the load is determined. Accordingly, since the hydraulic pressure in the hydraulic cylinder is not necessarily constant, determination is not easy, and it is difficult to perform appropriate control in all the raised states.
Further, Patent Document 2 also discloses a technique for determining that the body is close to a standing posture based on the rotation of the body around the fulcrum axis. For example, if the hydraulic pressure in the hydraulic cylinder is high, the lifting speed of the body may suddenly increase as soon as the load is lowered from the body. Is likely to be delayed, and it is still difficult to perform appropriate control in all the rising states.

  For this reason, it is conceivable that the operator of the dump truck controls the lifting / lowering of the body by manual operation. However, as described above, it is not possible to visually recognize how much the lifting / lowering state of the body is from the driver seat of the dump truck. In many cases, in this case, in order to prevent an impact from occurring when the body stands up or sits down, the issue is how to notify the operator of the lifted state of the body.

  The present invention has been made in order to solve such problems. The object of the present invention is to accurately notify the operator of the lifting / lowering state of the body regardless of the weight and state of the load on the body. It is an object of the present invention to provide a body lifting state notifying device for a dump truck that can realize appropriate lifting of the body without impact even by the above operation.

  In order to achieve the above object, in the body lifting state notifying device for a dump truck according to claim 1, a body placed on a vehicle body, a hydraulic cylinder for moving the body up and down in a standing posture and a seating posture, Body raising and lowering of a dump truck having operating means for operating raising and lowering of the body and control means for controlling the raising and lowering of the body by extending and contracting the hydraulic cylinder by supplying pressure oil according to the degree of operation of the operating means A state notification device comprising: an operation degree detection means for detecting an operation degree of the operation means; a body posture detection means for detecting the posture of the body relative to the vehicle body; and the operation means detected by the operation degree detection means. Notification means for notifying the raising / lowering state of the body based on the degree of operation of the body and the body posture detected by the body posture detection means. Characterized in that was.

That is, in the dump truck, the operator is accurately notified of the raising / lowering state of the body based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means. As a result, the operator can quickly and appropriately operate the operating means, and the lifting and lowering of the body can be appropriately controlled.
According to a second aspect of the dump truck body lifting / lowering state notifying device according to the second aspect of the invention, the operation degree detecting means includes a hydraulic pressure detecting means for detecting a hydraulic pressure in the hydraulic cylinder as an operation result of the operating means. The notifying means notifies the raising / lowering state of the body based on the hydraulic pressure detected by the hydraulic pressure detecting means and the body posture detected by the body posture detecting means.

That is, in the dump truck, the operator is more accurately notified of the lifting / lowering state of the body based on the hydraulic pressure supplied to the hydraulic cylinder and detected by the hydraulic pressure detection means and the body posture detected by the body posture detection means.
Further, in the dump truck body lifting / lowering state notifying device according to claim 3, in claim 1 or 2, the notifying means notifies the lifting / lowering state of the body by an alarm sound, and the degree of operation of the operating means The characteristic of the alarm sound is changed according to the body posture.

That is, by changing the characteristics of the alarm sound in accordance with the degree of operation of the operating means and the body posture, the operator is accurately notified of the up / down state of the body.
According to a fourth aspect of the present invention, in the dump truck body raising / lowering state notification device, in the third aspect, the notification means corresponds to the first characteristic of the alarm sound corresponding to the degree of operation of the operation means and the body posture. Each of the second characteristics of the alarm sound is changed.

That is, by changing the characteristics of the alarm sound according to the operation degree of the operation means and the body posture, and changing the first characteristic corresponding to the operation degree of the operation means and the second characteristic corresponding to the body posture, respectively. The operator is more accurately notified of the lifting / lowering state of the body.
According to a fifth aspect of the present invention, in the dump truck body raising / lowering state notification device, the first characteristic or the second characteristic is the intensity of the warning sound. .

  That is, either one of the first characteristic and the second characteristic is set as an alarm sound intensity (volume, etc.), and the intensity of the alarm sound is changed according to the operation degree of the operating means or the body posture. The condition is accurately notified to the operator. For example, the greater the degree of operation on the raising side of the operating means when the body is raised, and the greater the degree of operation on the lower side of the operating means when the body is lowered, the greater the intensity of the alarm sound.

Further, in the dump truck body raising / lowering state notification device according to claim 6, in claim 5, the notification means sounds the alarm sound intermittently, and the first characteristic and the second characteristic The other of these is an intermittent period of the alarm sound.
That is, either one of the first characteristic and the second characteristic is set as an intermittent period of the alarm sound, and by changing the intermittent period of the alarm sound according to the operation degree of the operating means or the body posture, The operator is accurately notified. For example, the intermittent period of the warning sound is shortened as the body posture is closer to standing when the body is raised and the body posture is closer to sitting when the body is lowered.

According to a seventh aspect of the present invention, in the dump truck body raising / lowering state notifying device, in the first or second aspect, the notifying means includes the operation degree of the operating means detected by the operation degree detecting means and the body posture detecting means. The display device is characterized by comprising display means capable of schematically displaying the ascending / descending state of the body based on the detected body posture.
That is, in the dump truck, the lifting / lowering state of the body is accurately notified to the operator by the display means based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means. As a result, the operator can quickly and appropriately operate the operation means, and the lifting and lowering of the body can be appropriately controlled.

  Further, in the dump truck body lifting / lowering state notifying device according to claim 8, in claim 7, the display means is a display capable of multipurpose display, and the notifying means is detected by the operation degree detecting means. Based on the degree of operation of the operating means and the body posture detected by the body posture detecting means, the display is switched to a body display screen on which the lifting state of the body is schematically displayed, and on the body display screen, the display It is characterized by changing the display of the lifting state of the body.

  That is, based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means, the screen display of the multi-purpose display is switched to the body display screen, Is schematically displayed on the body display screen and is accurately notified to the operator.

  According to the body lifting / lowering state notifying device of the dump truck according to claim 1, the operator is informed of the lifting / lowering state of the body based on the operation degree of the operating means detected by the operation degree detecting means and the body posture detected by the body posture detecting means. Therefore, it is possible to accurately notify the operator of the lifted state of the body. As a result, the operator can operate the operating means quickly and appropriately to appropriately control the lifting and lowering of the body, and even if the weight and state of the load on the body are not constant, Regardless of the weight and state, it is possible to sufficiently relieve the impact of standing up and sitting on the body with a simple structure.

In addition, when the operator is accurately notified of the lifting / lowering state of the body in this way, for example, it becomes easy to finely adjust the lifting / lowering speed of the body when removing soil and the like, and it is possible to reduce the trouble of repeating the lifting / lowering of the body. There are also advantages.
According to the body lifting / lowering state notifying device of the dump truck according to the second aspect, the operation degree of the operating means is set to indicate the lifting / lowering state of the body, the hydraulic pressure of the hydraulic cylinder is more realistic, and the hydraulic pressure supplied to the hydraulic cylinder is Since the operator is notified of the lifting / lowering state of the body based on the body posture detected by the body posture detection means, the lifting / lowering state of the body can be more accurately notified to the operator. Thereby, the operator can operate the operating means more quickly and appropriately, and the raising and lowering of the body can be controlled more appropriately.

According to the body lifting state notifying device of the dump truck according to the third aspect, since the characteristic of the alarm sound is changed according to the operation degree of the operating means and the body posture, the operator is confirming the rear side. However, it is possible to easily notify the operator of the up-and-down state of the body with ease regardless of the visual sense.
According to the body raising / lowering state notifying device of the dump truck according to claim 4, the characteristics of the alarm sound are different according to the degree of operation of the operating means and the body posture, and the first characteristic corresponding to the degree of operation of the operating means. Since the second characteristics are respectively changed in accordance with the body posture, it is possible to more accurately notify the operator of the lifted state of the body.

  Further, according to the body lifting state notifying device of the dump truck according to claim 5, either one of the first characteristic and the second characteristic is set to an alarm sound intensity (volume etc.), and the degree of operation of the operating means or the body posture Therefore, for example, the greater the degree of operation on the raising side of the operating means when the body is raised, the greater the degree of operation on the lowered side of the operating means when the body is lowered, By increasing the value, it is possible to notify the operator of the ascending / descending state of the body more accurately.

  According to the body raising / lowering state notifying device of the dump truck according to claim 6, either one of the first characteristic and the second characteristic is an intermittent period of the alarm sound, and depending on the operation degree of the operating means or the body posture. Since the intermittent cycle of the alarm sound is changed, for example, the alarm sound intermittent cycle is shortened by shortening the intermittent cycle of the alarm sound as the body posture is closer to standing when the body is raised and as the body posture is closer to sitting when the body is lowered. Due to the combined action with the change in strength, the operator can be notified of the lifted state of the body more accurately.

  Further, according to the body lifting / lowering state notifying device of the dump truck according to claim 7, the lifting / lowering state of the body based on the operation degree of the operating means detected by the operation degree detecting means and the body posture detected by the body posture detecting means. Is displayed to the operator by the display means, so that the operator can be accurately notified of the lifted state of the body. As a result, the operator can easily grasp the lifting state of the body, operate the operating means quickly and appropriately, and control the lifting of the body appropriately. The impact at the time can be sufficiently mitigated.

  According to the body lifting state notifying device of the dump truck of claim 8, the display means is a display capable of multi-purpose display, and the operation degree of the operation means detected by the operation degree detection means and the body posture detection means are detected. Based on the body posture, the screen display of the display is switched to the body display screen, and the lifting / lowering state of the body is schematically displayed on the body display screen to notify the operator. However, it is possible to accurately notify the operator of the lifting / lowering state of the body.

Embodiments of a body lifting state notifying device for a dump truck according to the present invention will be described below with reference to the drawings.
First, the first embodiment will be described.
FIG. 1 is a schematic view schematically showing the configuration of a body lifting state notifying device for a dump truck according to a first embodiment of the present invention. The configuration of the body lift state notification device for the dump truck will be described below with reference to FIG.

  As shown in FIG. 1, the dump truck 1 is a large dump truck used in, for example, a quarry, and has a body 4 placed on a vehicle body 2. Specifically, the lower surface of the body 4 is connected to the rear end portion of the vehicle body 2 via a support shaft 6 at a portion slightly rearward of the center in the front-rear direction, whereby the dump truck 1 supports the body 4 with respect to the vehicle body 2. It can be rotated around the axis 6.

A pair of left and right hydraulic cylinders 10, 10 that extend and contract by pressure oil supply / discharge are interposed between the front portion of the lower surface of the body 4 and the vehicle body 2 slightly from the front-rear center. As a result, when pressure oil is supplied to or discharged from the hydraulic cylinders 10 and 10, the piston rods 12 and 12 expand and contract, and the body 4 can move up and down within the operating range of the piston rods 12 and 12 with the support shaft 6 as a fulcrum. It is.
A pressure chamber 13 and a pressure chamber 14 are formed in the hydraulic cylinder 10 with a piston interposed therebetween. An oil passage 16 is connected to the pressure chamber 13, and an oil passage 18 is connected to the pressure chamber 14. The oil passage 16 and the oil passage 18 are connected to output ports 21 and 22 of the electromagnetic control valve 20, respectively.

  The electromagnetic control valve 20 is a three-port switching valve having the input ports 23 and 24 together with the output ports 21 and 22, and communication and output between the output port 21 and the input port 23 by supplying signals to the solenoid units 20 a and 20 b. The communication position between the port 22 and the input port 24 (hereinafter referred to as the “normal position”), the output port 21 and 22 and the input port 23 and 24 and the input port 24 and the output port 22 and the output port 21 between the output port 21 and the input port 24. And three communication positions (hereinafter referred to as reverse positions) of the input port 23 can be switched.

A high pressure hydraulic pump 28 is connected to the input port 23 of the electromagnetic control valve 20 via an oil passage 26, and the hydraulic pump 28 is connected to an oil sump 29. The input port 24 is directly connected to the oil sump 29 via the oil passage 27.
The hydraulic pump 28 is a mechanical pump that operates using the output of the engine 30 that drives the dump truck 1 mounted on the vehicle body 2 so that the discharge pressure increases as the rotational speed Ne of the engine 30 increases. It has special characteristics.

  Thus, when the electromagnetic control valve 20 is switched to the normal position (shown position), high pressure oil is supplied from the hydraulic pump 28 to the pressure chamber 13 and oil in the pressure chamber 14 is supplied to the oil reservoir 29. As a result, the hydraulic cylinder 10 operates to extend the piston rod 12 and raises the body 4. When the electromagnetic control valve 20 is switched to the shut-off position, the hydraulic pressure in the pressure chamber 13 and the pressure chamber 14 is maintained, so that the operation of the hydraulic cylinder 10 is stopped and the posture of the body 4 is maintained as it is. . When the electromagnetic control valve 20 is switched to the reverse position, high-pressure oil is supplied from the hydraulic pump 28 to the pressure chamber 14 and the oil in the pressure chamber 13 is changed to the oil, contrary to the normal position. The hydraulic cylinder 10 moves to the reservoir 29 and operates to contract the piston rod 12 to lower the body 4.

As shown in FIG. 1, the volume of the pressure chamber 14 of the hydraulic cylinder 10 is very small compared to the pressure chamber 13, and when the body 4 is lowered, the body 4 actually has its own weight and the oil in the pressure chamber 13. It will descend while pulling out.
The hydraulic pump 28 is connected to the engine 30 through a clutch mechanism so as to be connected and disconnected. Even when the engine 30 is operating, the operation of the hydraulic pump 28 can be stopped by disconnecting the clutch mechanism. That is, even when the electromagnetic control valve 20 is in the normal position or the reverse position, the clutch mechanism is disengaged, and both the oil in the pressure chamber 13 and the pressure chamber 14 of the hydraulic cylinder 10 can be returned to the oil reservoir 29. It is. That is, the hydraulic cylinder 10 can be in a neutral state where no hydraulic pressure is applied. As a result, the body 4 can be appropriately lowered by its own weight, that is, in a floating state.

Further, the electromagnetic control valve 20 adjusts the opening degree of the output ports 21 and 22 by adjusting the signal strength (current value, etc.) to the solenoid parts 20a and 20b in the forward position and the reverse position. The added hydraulic pressure can be adjusted. Thereby, the raising / lowering speed of the body 4 can be adjusted.
In the cab of the dump truck 1, a hoist lever (operating lever, operating means) 41 for an operator to raise and lower the body 4 and an accelerator pedal (operating means) for adjusting the output of the engine 30, that is, the rotational speed Ne. Various operating devices such as 43 are provided.

The electronic control unit (hereinafter, ECU) 40 is a control device (control means) for electronically performing various controls in the dump truck 1.
In relation to the present invention, on the input side of the ECU 40, a hoist sensor (operation degree detecting means) 42 for detecting the lever position and the operation amount (operation degree) θh of the hoist lever 41, the operation amount of the accelerator pedal 43, In other words, an accelerator position sensor (APS, operation degree detection means) 44 for detecting the accelerator opening (operation degree) is connected, and the rotation angle around the support shaft 6 of the body 4, that is, the body angle (body posture) θb is detected. A body angle sensor (body posture detecting means) 46 is connected.

On the other hand, on the output side of the ECU 40, the solenoid units 20a and 20b of the electromagnetic control valve 20 are connected, and a speaker (notification means) 48 for generating a sound such as a warning sound is connected.
FIG. 2 is a block diagram showing an internal configuration of the ECU 40 in the body lifting state notifying device according to the first embodiment of the present invention.

As shown in the figure, the ECU 40 has a body operation command amount detection unit (operation degree detection unit) 401, a body angle detection unit (body posture detection unit) 402, a body speed command unit 403, in relation to the present invention. An alarm intensity calculation unit 404, an alarm cycle calculation unit 405, and an alarm sound generation unit (notification means) 406 are provided.
The body operation command amount detection unit 401 has a function of outputting a body operation command amount based on information from the hoist sensor 42 and the APS 44, and the body angle detection unit 402 is based on information from the body angle sensor 46. It has a function of detecting and outputting the body angle θb.

The body speed command unit 403 outputs a body speed command based on the output signal of the body operation command amount detection unit 401, that is, an operation signal corresponding to the output signal of the body operation command amount detection unit 401 is sent to the electromagnetic control valve 20 or the engine. 30.
The alarm intensity calculation unit 404 has a function of calculating the intensity of the alarm sound (first characteristic, volume, etc.) based on the output signal of the body operation command amount detection unit 401, and the alarm period calculation unit 405 includes the body angle It has a function of calculating an intermittent period (second characteristic, hereinafter, alarm period) of an alarm sound based on an output signal of the detection unit 402.

The alarm sound generation unit 406 has a function of generating an alarm sound based on the output signals of the alarm intensity calculation unit 404 and the alarm cycle calculation unit 405 and outputting the alarm sound to the speaker 48.
Hereinafter, the operation of the body lifting state notifying device according to the first embodiment of the present invention configured as described above will be described. Here, a case where the dump truck 1 is stopped and the engine 30 is in an idle operation state will be described as an example.

  As shown in the operation position of the hoist lever 41 in FIG. 3, the operator operates the hoist lever 41 to stop the operation of the hydraulic pump 28 and bring the hydraulic cylinder 10 into a neutral state to bring the body 4 into a floating state. Position, holding position for holding the posture of the body 4 as it is with the electromagnetic control valve 20 as the shut-off position, a raising position for raising the body 4 with the electromagnetic control valve 20 as the normal position, and the body 4 with the electromagnetic control valve 20 as the reverse position One of the lowering positions for lowering can be selected.

In the raised position and the lowered position, the signal strength (current value) supplied to the solenoid portions 20a and 20b of the electromagnetic control valve 20 can be adjusted according to the operation amount θh of the hoist lever 41 from the floating position or the holding position. . Accordingly, it is possible to increase the ascending speed and the descending speed of the body 4 as the operation amount θh of the hoist lever 41 is larger on the raising side and the lowering side.
Here, for example, a case where the hoist lever 41 is operated to the up side to raise the body 4 and release the loaded earth and sand will be described.

  Normally, when the body 4 is in a seated state with earth and sand loaded thereon, the hoist lever 41 is in a floating position and the hydraulic cylinder 10 is in a neutral state in order to prevent damage to the hydraulic cylinder 10 due to traveling vibration or the like. First, in order to raise the body 4, the operator of the dump truck 1 operates the hoist lever 41 from the floating position or the holding position to the raising side. At this time, when it is desired to release the earth and sand quickly, the operator increases the operation amount θh to the lifting side of the hoist lever 41, and when the operator wants to release the earth little by little, the operator raises the hoist lever 41. The operation amount θh to the side is reduced.

  As a result, the operation amount information θh from the hoist sensor 42 to the raising side of the hoist lever 41 is input to the body operation command amount detection unit 401 of the ECU 40, and the operation signal corresponding to the output signal from the body operation command amount detection unit 401 Is supplied from the body speed command unit 403 to the electromagnetic control valve 20, and the electromagnetic control valve 20 is switched to the normal position. When the operator greatly operates the hoist lever 41, the opening degree of the output ports 21 and 22 of the electromagnetic control valve 20 increases, and sufficient pressure oil is supplied to the pressure chamber 13 of the hydraulic cylinder 10 so that the body 4 It rises quickly and the earth is released. On the other hand, when the operator operates the hoist lever 41 small, the opening degree of the output ports 21 and 22 of the electromagnetic control valve 20 is kept small, the hydraulic pressure in the pressure chamber 13 of the hydraulic cylinder 10 is not so high, and the body 4 Ascends slowly and is gradually released.

  Note that, as described above, the hydraulic pump 28 has a characteristic that the discharge pressure increases as the rotational speed Ne of the engine 30 increases. Therefore, the hydraulic pressure supplied to the pressure chamber 13 of the hydraulic cylinder 10 can also be adjusted by increasing the operation amount of the accelerator pedal 43. That is, when the operator operates the accelerator pedal 43, the accelerator opening information is also input from the APS 44 to the body operation command amount detection unit 401, and the operation signal corresponding to the output signal from the body operation command amount detection unit 401 is the body speed. It is supplied from the command unit 403 to the engine 30. Accordingly, when the rotational speed Ne of the engine 30 increases, the discharge pressure of the hydraulic pump 28 increases, and in addition to the operation of the hoist lever 41, the hydraulic pressure supplied to the pressure chamber 13 of the hydraulic cylinder 10 increases, It rises promptly.

  Further, the output signal from the body operation command amount detection unit 401 is also supplied to the alarm intensity calculation unit 404, and the alarm intensity calculation unit 404 calculates the intensity of the alarm sound according to the body operation command amount. Specifically, the larger the operation amount θh of the hoist lever 41 or the operation amount of the accelerator pedal 43 is, the larger the body operation command amount is. As shown in the map of FIG. It is set to increase as the command amount increases.

  On the other hand, when the body 4 rises, the body angle θb increases from the sitting state (for example, θb = 0 °), and the body angle information θb from the body angle sensor 46 is input to the body angle detection unit 402. Then, the body angle detection unit 402 calculates an alarm cycle according to the body angle θb. Specifically, when the angle range from the sitting state to the standing state is associated with 0% to 100% as shown in FIG. 5, as shown in the map of FIG. It is constant until it reaches 80% of the total, gradually decreases from 80% to 90%, and is set to zero, that is, a continuous sound when it exceeds 90%.

The alarm intensity information and the alarm cycle information calculated in this way are supplied to the alarm sound generation unit 406 and synthesized by the alarm sound generation unit 406 to generate one alarm sound. Is output. That is, an alarm sound having an intensity corresponding to the alarm intensity information and an alarm period corresponding to the alarm period information is output from the speaker 48.
Referring to FIG. 7, for example, the time change of the operation amount θh (a), the body angle θb (b), the alarm period (c), the alarm amplitude, that is, the alarm intensity (d) of the hoist lever 41 is a time chart. As shown in the figure, when the operation of raising the hoist lever 41 is started (at time T1) and the operation amount θh is gradually increased to the raising side, an alarm is generated accordingly. When the amplitude, that is, the alarm intensity is gradually increased, and then the body 4 gradually rises and the body angle θb exceeds 80% of the whole, for example, the alarm cycle is shortened (at time T2). When the body 4 approaches the standing state so as to exceed 90%, the alarm sound is made continuous (at time T3).

  As described above, the larger the operation amount θh of the hoist lever 41 and the operation amount of the accelerator pedal 43, the larger the alarm intensity (volume etc.), and the alarm sound is generated so that the alarm cycle is shortened as the body 4 is in the standing state. Then, the operator is appropriately notified of the rising state of the body 4 based on the change in the warning intensity and the warning cycle. Thereby, for example, the operator can easily detect that an impact is high when the body 4 stands up because the alarm intensity of the alarm sound is large and the alarm cycle of the alarm sound is short or has changed to a continuous sound. The hoist lever 41 and the accelerator pedal 43 can be quickly and appropriately returned so as to reduce the operation amount θh of the hoist lever 41 and the operation amount of the accelerator pedal 43 (at time T4). Thereafter, the ascent of the body 4 is appropriately controlled, the ascending speed of the body 4 decreases, and the body 4 gradually moves to the standing state. can do.

  In particular, when the dump truck 1 is large, the operator often cannot fully grasp the rising state of the body 4, and the weight and state (adhesion degree, etc.) of the load on the body 4 are not constant and the earthing is smooth. However, even in such a case, the rise of the body 4 can be appropriately controlled regardless of the weight and state of the load on the body 4, and the body can be raised with a simple configuration. The shock at the time can be sufficiently mitigated.

Moreover, when raising the body 4 and releasing the earth, the operator usually confirms the state of the rear, and by changing the alarm intensity of the alarm sound and the alarm cycle, it is good regardless of visual sense. It is possible to notify the operator of the rising state of the body 4.
Here, the case where the body 4 is raised and the earth and sand are released has been described, but when the body 4 is lowered, the operation amount θh of the hoist lever 41 and the operation amount of the accelerator pedal 43 and the body angle are also the same as described above. It is preferable to change the intensity of the alarm sound and the alarm cycle based on θb. Thereby, the operator can be appropriately notified of the lowered state of the body 4.

  Although detailed description is omitted, when the body 4 is lowered, for example, when the operation of lowering the hoist lever 41 is started and the operation amount θh is gradually increased to the lower side, When the alarm amplitude, that is, the alarm intensity is gradually increased, the body 4 is gradually lowered and the body angle θb falls below, for example, 20%, the alarm cycle is shortened, and the body angle θb falls below, for example, 10%. When the body 4 is close to the seating state, the alarm sound is made continuous.

  This makes it easy for the operator to generate a shock when the body 4 is seated, for example, because the alarm intensity of the alarm sound is large and the alarm cycle is short or the alarm sound is changed to a continuous sound. The hoist lever 41 and the accelerator pedal 43 can be returned quickly and appropriately, and the lowering speed of the body 4 can be lowered and the body 4 can be gradually moved to the seated state. In addition, the impact when the body 4 is seated can be sufficiently mitigated.

In addition, when the operator is accurately notified of the lifting / lowering state of the body 4 in this way, for example, it becomes easy to finely adjust the lifting / lowering speed of the body 4 when removing earth and sand, etc. There is also an advantage that it can be reduced.
Next, a second embodiment will be described.
FIG. 8 is a diagram schematically showing a part of the configuration of the body lifting / lowering state notification device for a dump truck according to the second embodiment of the present invention. As shown in the figure, in the second embodiment, the body raising / lowering state notification device includes a pressure sensor 11 that detects the hydraulic pressure in the pressure chamber 13 of the hydraulic cylinder 10. In addition, it is the same as that of the said 1st Embodiment except the point where the pressure sensor 11 is provided, Here, only a different part from the said 1st Embodiment is demonstrated.

As shown in a block diagram of the internal configuration of the ECU 40 in the body lifting state notifying device according to the second embodiment of the present invention in FIG. 9, in the second embodiment, instead of the operation amount information θh from the hoist sensor 42, the pressure The hydraulic pressure information from the sensor 11 and the accelerator opening information from the APS 44 are input to the body operation command amount detection unit 401.
That is, in the second embodiment, the body operation command amount is detected not based on the operation amount information θh from the hoist sensor 42 but based on the hydraulic pressure information from the pressure sensor 11, that is, the hydraulic pressure in the pressure chamber 13 of the hydraulic cylinder 10. Based on the body operation command amount, the intensity of the alarm sound (volume etc.) is calculated.

As described above, when the intensity of the alarm sound is calculated based on the hydraulic pressure information from the pressure sensor 11, the hydraulic pressure information from the pressure sensor 11 indicates the ascending / descending state of the body 4 more than the operation amount information θh from the hoist sensor 42. Since it can be regarded as information that is closer to reality as shown, it is possible to notify the operator of the ascending / descending state of the body 4 more accurately.
Thus, the operator can return the hoist lever 41 and the accelerator pedal 43 more quickly and appropriately.

  In particular, when raising the body 4, during the release of the earth and sand, when the earth and sand move backward from the support shaft 6, the body 4 may be accelerated by the weight of the earth and sand. Thus, if the intensity of the alarm sound is changed according to the hydraulic pressure in the hydraulic cylinder 10, the operator can easily detect the acceleration of the body 4, and the hoist lever 41 and the accelerator pedal 43 are preferably operated. The return operation can be performed.

Next, a third embodiment will be described.
FIG. 10 is a diagram schematically showing a part of the configuration of the body lift state notification device for a dump truck according to the third embodiment of the present invention. As shown in the figure, in the third embodiment, the body raising / lowering state notification device includes a color liquid crystal display (notification means, display means) 50 instead of the speaker 48. In addition, it is the same as that of the said 1st or 2nd embodiment except the point where the liquid crystal display 50 is provided, Here, only a different part from the said 1st or 2nd embodiment is demonstrated.

The liquid crystal display 50 is a display device configured to be able to change display contents for multiple purposes. For example, the liquid crystal display 50 is provided in an instrument panel in front of the driver's seat, and is usually based on information from the ECU 40 as shown in FIG. Various instruments of the dump truck 1 (running speed meter, engine speed meter, cooling water thermometer, oil temperature gauge, various status indicators) are displayed.
FIG. 12 is a block diagram showing the internal configuration of the ECU 40 ′ in the body lifting state notifying device according to the third embodiment of the present invention. As shown in the figure, in the third embodiment, the ECU 40 receives the body operation command amount information from the body operation command amount detection unit 401 and the body angle information from the body angle detection unit 402 via the screen display switching unit 410. An image that is input to the image generation unit (notification unit) 412 and generated by the image generation unit 412 is displayed on the liquid crystal display 50.

Hereinafter, an operation of the body lifting state notifying device according to the third embodiment of the present invention configured as described above will be described. Here, as in the first embodiment, a case will be described in which, for example, the body 4 is lifted to discharge the loaded earth and sand.
FIG. 13 shows a display routine of the liquid crystal display 50, which will be described below along with the display routine.

  When it is determined that the hoist lever 41 is in the lowered position or the floating position based on the information from the hoist sensor 42, or the body angle θb is determined to be less than 10% of the whole based on the information from the body angle sensor 46, for example. If so, it can be determined that the body 4 is in the seated state. In this case, the liquid crystal display 50 is set to the normal screen in step S1, and the traveling information of the dump truck 1 is displayed as shown in FIG.

On the other hand, when the hoist lever 41 is operated to the raised position and the body angle θb is determined to be, for example, 10% or more of the entire body, it can be determined that the body 4 is rising (body up state). In S2, the liquid crystal display 50 is switched to a body state screen (body display screen) as shown in FIG.
As shown in FIG. 14, the body state screen is shown in a schematic view of the dump truck 1 seen from the side, and the display of the schematic view portion of the body 4 is changed in accordance with the actual lifting state of the body 4, and the body It is configured to be able to monitor the four lift states in real time. In the body state screen, the standing position of the body 4 is fixedly displayed with a broken line, for example. From this, on the body state screen, in addition to the ascending state of the body 4, that is, the ascending speed of the body 4, the positional relationship between the standing position of the body 4 and the current position can be easily grasped at a glance. The schematic diagram of the schematic diagram portion of the body 4 is displayed in yellow, for example.

When the body angle θb is determined to be 90% or more of the whole with the hoist lever 41 operated to the raised position, for example, it can be determined that the body 4 is close to the standing state. The display 50 is switched to a body alarm screen (body display screen) as shown in FIG.
On the body warning screen, as shown in FIG. 15, in addition to the display of FIG. 14, the display of the schematic diagram portion of the body 4 is emphasized. Specifically, for example, the density, brightness, and saturation of the display of the schematic diagram portion of the body 4 are changed, blinked, or the color is changed to a color that attracts attention rather than yellow (for example, red). To do.

  In this way, the rising state of the body 4 is monitored by the liquid crystal display 50, and when the body 4 approaches the standing state, the display of the schematic diagram portion of the body 4 is emphasized, thereby changing the alarm intensity and the alarm cycle as described above. As in the case of generating an alarm sound, the operator is appropriately notified of the rising state of the body 4. As a result, the operator can easily detect that there is a high possibility that an impact will occur when the body 4 stands up, just by looking at the image on the liquid crystal display 50, and the operation amount θh of the hoist lever 41 and the accelerator pedal The hoist lever 41 and the accelerator pedal 43 can be quickly and appropriately returned so as to reduce the operation amount of 43. Thereafter, the ascending speed of the body 4 decreases, and the body 4 gradually moves to the standing state. As described above, the body 4 is set up in a simple configuration regardless of the weight and state of the load on the body 4. The impact can be sufficiently reduced.

In addition, since the dump truck 1 is normally stopped when the body 4 is moved up and down, various instruments are rarely required during the stop. Therefore, the liquid crystal display 50 is displayed on the normal screen when the body 4 is moved up and down. By switching from the body state screen to the body state screen, there is an advantage that the liquid crystal display 50 can be used effectively without providing a separate dedicated display device.
When the hoist lever 41 is no longer in the raised position, the body 4 begins to descend (body down state). In this case, the liquid crystal display 50 is switched to the body alarm screen in step S4. Thereby, the lowered state of the body 4 can be confirmed at a glance on the liquid crystal display 50.

When it is determined that the hoist lever 41 is in the lowered position or the floating position, or when it is determined that the body angle θb is, for example, less than 10% of the whole, it can be determined that the body 4 is in the seated state. In this case, the liquid crystal display 50 is returned to the normal screen in step S1, and the traveling information of the dump truck 1 is displayed.
Here, the case where the body 4 is raised and the earth and sand are released has been described. However, even when the body 4 is lowered, the liquid crystal display 50 is switched to the body warning screen when the body 4 is close to the seating state. As a result, the operator can be more appropriately notified of the lowered state of the body 4, and the impact when the body 4 is seated can be sufficiently mitigated, as described above.

This is the end of the description of the embodiment of the present invention, but the embodiment is not limited to the above.
For example, in each of the above embodiments, the alarm intensity (volume etc.) is changed based on the operation amount θh of the hoist lever 41 or the operation amount of the accelerator pedal 43. However, for example, only the operation amount θh of the hoist lever 41 is used. Based on this, the alarm intensity may be changed.
Further, in each of the above embodiments, display means such as an alarm sound or the liquid crystal display 50 is used as means for notifying the operator, but other media may be used, for example, the light characteristics are changed by an alarm lamp or the like. You may do it.

In each of the above embodiments, the body angle θb, that is, the body posture is detected using the body angle sensor 46. However, the present invention is not limited to this as long as the body posture can be detected.
Moreover, in the said 1st and 2nd embodiment, although the alarm intensity | strength and alarm period of the alarm sound were changed, it is not restricted to an alarm intensity | strength and an alarm period, Other characteristics (sound quality, frequency, etc.) of an alarm sound are changed. It may be changed.

In the first and second embodiments, the alarm intensity (volume etc.) is changed based on the operation amount θh of the hoist lever 41 and the operation amount of the accelerator pedal 43, and the alarm cycle is changed based on the body angle θb. However, these may be reversed.
In the first and second embodiments, both the alarm intensity and the alarm cycle are changed. However, the alarm is based on the operation amount θh of the hoist lever 41, the operation amount of the accelerator pedal 43, and the body angle θb. Only one of the intensity and the alarm cycle may be changed.

  In the third embodiment, the liquid crystal display 50 capable of changing display contents for multiple purposes is used as the display means. However, the display means is not limited to this, and the display means may be a CRT. If the display of the part can be changed, the display contents need not be changed for multiple purposes.

It is the schematic which shows typically the structure of the body raising / lowering state notification apparatus of the dump truck which concerns on 1st Embodiment of this invention. It is a block diagram which shows the internal structure of ECU in the body raising / lowering state notification apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the operation position of a hoist lever, respectively. It is a map which shows the relationship between body operation command amount and alarm intensity | strength. It is a figure which shows the correspondence of the angle range from a seating state to a standing state, and 0%-100%. It is a map which shows the relationship between body angle (theta) b and an alarm period. It is a time chart which shows the time change of operation amount (theta) h (a) of a hoist lever, body angle (theta) b (b), an alarm period (c), and an alarm amplitude (d). It is a figure which shows typically a part of structure of the body raising / lowering state notification apparatus of the dump truck which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the internal structure of ECU in the body raising / lowering state notification apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows typically a part of structure of the body raising / lowering state notification apparatus of the dump truck which concerns on 3rd Embodiment of this invention. It is a figure which shows the normal screen of a liquid crystal display. It is a block diagram which shows the internal structure of ECU in the body raising / lowering state notification apparatus which concerns on 3rd Embodiment of this invention. It is a figure which shows the display routine of a liquid crystal display. It is a figure which shows the body state screen of a liquid crystal display. It is a figure which shows the body alarm screen of a liquid crystal display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Body 4 Body 10 Hydraulic cylinder 11 Pressure sensor 20 Electromagnetic control valve 28 Hydraulic pumps 40 and 40 'Electronic control unit (ECU)
41 Hoist lever (operating means)
42 Hoist sensor (operation level detection means)
43 Accelerator pedal (operating means)
44 Accelerator position sensor (APS, operation level detection means)
46 Body angle sensor (body posture detection means)
48 Speaker (notification means)
50 Liquid crystal display (notification means, display means)
401 Body operation command amount detection unit (operation degree detection means)
402 Body angle detection unit (body posture detection means)
404 Alarm intensity calculator 405 Alarm cycle calculator 406 Alarm sound generator (notification means)
410 Screen display switching unit 412 Image generation unit (notification means)

Claims (8)

A body placed on a vehicle body, a hydraulic cylinder that raises and lowers the body to a standing posture and a seating posture with respect to the vehicle body, operating means for operating the lifting and lowering of the body, and pressure oil corresponding to an operation degree of the operating means A dump truck body lifting state notifying device having control means for controlling the lifting and lowering of the body by extending and contracting the hydraulic cylinder by supplying
An operation degree detection means for detecting an operation degree of the operation means;
Body posture detection means for detecting the posture of the body relative to the vehicle body;
Notifying means for notifying the raising / lowering state of the body based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means;
Dump truck body raising / lowering state notification device characterized by comprising: The operation degree detection means includes a hydraulic pressure detection means for detecting a hydraulic pressure in the hydraulic cylinder as a result of operation of the operation means,
2. The dump truck according to claim 1, wherein the notifying unit notifies the raising / lowering state of the body based on the hydraulic pressure detected by the hydraulic pressure detecting unit and the body posture detected by the body posture detecting unit. Body lifting state notification device.   The notification means is for notifying the raising / lowering state of the body by an alarm sound, and changes a characteristic of the alarm sound according to an operation degree of the operation means and the body posture. Item 3. A dump truck body lifting state notifying device according to Item 1 or 2.   The notification means changes a first characteristic of the warning sound corresponding to an operation degree of the operating means and a second characteristic of the warning sound corresponding to the body posture, respectively. 4. Dump truck body lifting state notifying device according to 3.   5. The dump truck body lifting / lowering state notification device according to claim 4, wherein one of the first characteristic and the second characteristic is an intensity of the alarm sound. The notification means sounds the alarm sound intermittently,
6. The dump truck body lifting / lowering state notifying device according to claim 5, wherein one of the first characteristic and the second characteristic is an intermittent period of the warning sound.   The notification means includes a display means that can schematically display the raising / lowering state of the body based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means. The dump truck body raising / lowering state notifying device according to claim 1 or 2, characterized by comprising: The display means is a display capable of multipurpose display,
The notifying means schematically displays the up / down state of the body on the display based on the operation degree of the operation means detected by the operation degree detection means and the body posture detected by the body posture detection means. The dump truck body lifting / lowering state notification device according to claim 7, wherein the body lifting / lowering display is changed and the display of the lifting / lowering state of the body is changed on the body display screen.

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