JPH0361299A - Information indicating device for cargo handling vehicle - Google Patents

Abstract

PURPOSE:To minimize turning of operator's eyes to improve working efficiency by controlling cargo handling informations possible to be displayed on an upper displaying means near to the operator's eyes when running speed is less than a standard value and a lifted position of a lifting member is higher than a standard value. CONSTITUTION:A cargo handling condition detecting means is constituted with a tilt angle sensor 4 for a mast 2, a lifted position sensor 7 for a lifting member (fork) 5 and a pressure sensor 8 for a load working on the lifting member 5. A vehicle running condition detecting means for a forklift is constituted with a liquid surface level sensor 9 for a fuel tank, a vehicle speed sensor 10 and a water temperature sensor 11 for cooling water. When a running speed of the forklift detected with the detecting means mentioned above is less than a standard value and moreover a lifted position of the fork 5 is higher than a standard value, cargo handling informations of such as tilt angle data of the mast 2, lifted position data of the fork, and load data are displayed on an upper displaying means 14 at a driver's seat 12, and vehicle running informations on a lower displaying means 15 at the driver's seat 12 by a control means. In other cases, upper and lower displaying informations are inverted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information display device for a cargo handling vehicle that displays information regarding the cargo handling vehicle.

[Prior Art] Conventionally, for example, in a forklift truck equipped with forks for raising and lowering cargo, information regarding the running state of the cargo handling vehicle such as the remaining amount of fuel, water temperature, vehicle speed, etc., the load of the cargo on the fork, A variety of sensors detect a large amount of information, including information on cargo handling conditions such as the lift height of the forks and the inclination angle of the mast. Among these pieces of information, vehicle travel information only needs to be viewed once every few minutes during cargo handling operations, while cargo handling information needs to be viewed frequently.

Information obtained by the sensor is displayed on a display device. This display device is generally attached to a position near the steering wheel, or at two locations, one near the steering wheel and the other near the head guard. In the former display device as well as in the latter display device, only specific information set in advance is displayed on each display device.

[Problems to be Solved by the Invention] By the way, when using the forklift, the fork is moved upward to perform cargo handling work at a high place, and the fork is moved downward to perform cargo handling work on the ground or when the forklift is traveling. The direction of the worker's line of sight changes greatly depending on the situation.

However, as mentioned above, in the conventional technology, even if the display device is provided at only one location near the steering wheel, or even if the display device is provided at two locations above and below, each display device only displays specific information. Can not do it. Therefore, when an operator looks at the display device to confirm cargo handling information, he or she may have to move his or her line of sight considerably, which makes cargo handling difficult and poses a problem in improving work efficiency.

The present invention was made in view of the above-mentioned circumstances, and
The purpose is to display cargo handling information on a display device close to the worker's line of sight, thereby minimizing the movement of the worker's line of sight and improving work efficiency during cargo handling work. An object of the present invention is to provide an information display device for a cargo handling vehicle.

[Means for Solving the Problems] Therefore, in order to achieve the above object, the present invention provides a vehicle running state detection means for detecting the running state of the vehicle including the running speed of the vehicle, and a cargo handling operation including the vertical position of the lifting member. cargo handling work state detection means for detecting the state; vehicle running information provided at a position above the driver's seat and provided by the vehicle running state detection means;
and upper display means for displaying any one of the cargo handling information obtained by the cargo handling state detection means; a lower display means for displaying information different from the upper display means; and a lower display means for displaying information different from the upper display means; and a lower display means for displaying information different from the upper display means; The gist of the present invention is an information display device for a cargo handling vehicle, which includes a control means for displaying cargo handling information on an upper display means when the vertical position of a lifting member is higher than a predetermined value.

[Function] During cargo handling work, the running state of the vehicle including the running speed of the vehicle is detected by the vehicle running state detection means, and
The cargo handling state detection means detects the cargo handling state including the vertical position of the elevating member. When the traveling speed detected by the vehicle traveling state detecting means is lower than a predetermined value and the vertical position of the lifting member detected by the cargo handling work state detecting means is higher than a predetermined value,
The control means displays cargo handling information on the upper display means and vehicle travel information on the lower display means. In other cases, cargo handling information is displayed on the lower display means, and vehicle travel information is displayed on the upper display means.

[Embodiment] Hereinafter, an embodiment in which the present invention is embodied in an information display device incorporated in a forklift as a cargo handling vehicle will be described with reference to the drawings.

As shown in FIG. 2, a mast 2 is supported at the front part (left side in the figure) of the forklift of this embodiment. tilted. Tilt cylinder 3
A tilt angle sensor 4 for detecting the tilt angle of the mast 2 is attached to the mast.

Further, a fork 5 as an elevating member for elevating and lowering the cargo A is supported on the mast 2, and the fork 5 is moved up and down by a piston rod 6a that protrudes and retracts from a lift cylinder 6. The lift cylinder 6 includes a lift position sensor 7 for detecting the lift position of the fork 5, and the hydraulic system of the fork 5 includes a pressure sensor for detecting the load of the cargo A applied to the fork 5. 8 are installed respectively. In this embodiment, the inclination angle sensor 4, lift height position sensor 7, and pressure sensor 8 constitute a cargo handling state detection means for detecting the cargo handling state.

A liquid level sensor 9 is attached to the fuel tank of the machine 1 to detect the height of the liquid level in order to detect the remaining amount of fuel. Furthermore, a vehicle speed sensor 10 for detecting the traveling speed of the forklift is attached to the transmission of the machine base 1, and a water temperature sensor 11 for detecting the temperature of the coolant is attached near the coolant thermostat. In this embodiment, these liquid level sensors 9
, vehicle speed sensor lO1 and water temperature sensor 11 constitute vehicle running state detection means for detecting the running state of the forklift.

Below the head guard 13 located above the driver's seat 12 in the machine base 1, there is a dot matrix liquid crystal display (hereinafter referred to as upper LCD) 14 as an upper display means. On the instrument panel in front of the driver's seat 12,
A dot matrix type liquid crystal display (hereinafter referred to as a lower LCD) 15 as a lower display means is installed in each case.

Both of the upper and lower LCDs 14.15 are adapted to display either the cargo handling work information obtained by the cargo handling state detection means or the vehicle running information obtained by the vehicle running state a detection means. Here, the cargo handling work information includes inclination angle data of the mast 2 detected by the inclination angle sensor 4, lifting height position data of the fork 5 detected by the lifting height position sensor 7, and cargo handling work detected by the pressure sensor 8. It consists of data and is important information that workers need to see frequently during cargo handling operations. Further, the vehicle running information includes remaining fuel amount data detected by the liquid level sensor 9, vehicle speed data detected by the vehicle speed sensor 10,
and water temperature data detected by the water temperature sensor 11, and is information that only needs to be viewed once every few minutes during cargo handling operations.

Next, the electrical configuration of the information display device of this embodiment mounted on the forklift configured as described above will be explained based on FIG. 3.

Central processing unit (hereinafter referred to as CPU) as a control means
16 includes a program memory 17 consisting of a read-only memory (ROM) and a working memory 18 consisting of a readable and rewritable memory (RAM). The tilt angle sensor 4, lift position sensor 7, pressure sensor 8, liquid level sensor 9, vehicle speed sensor 10, and water temperature sensor 11 are connected to the input side of the CPU 16, and the information detected by these various sensors is connected to the input side of the CPU 16. The detected signal is C
It is now operated manually by PU16.

An upper LCD 14 and a lower LCD 15 are connected to the output side of the CPU 16 via display drive circuits 19 and 20, and the CPU 16 outputs either the cargo handling information or the vehicle running information detected by the various sensors to the upper LCD. The upper LCD 1 of the image information is displayed on the LCD 14.
Display information different from 4 on the lower LCD 15 (,
Control signals are output to display drive circuits 19 and 20.

Further, the CPU 16 reads the detection signal detected by the vehicle speed sensor 10, and determines the traveling speed of the forklift.
Calculate 1. Then, the CPU 16 compares the current running speed V1 with a reference running speed 2 stored in the program memory 17 in advance. Note that the reference traveling speed v2 in this embodiment is a traveling speed at which the forklift can be safely driven with the operator's eyes directed upward, and is a value experimentally determined.

When it is determined that the calculated traveling speed (1) is smaller than the reference traveling speed (2), the CPU 16 reads the detection signal detected by the lift position sensor 7,
The lift height position H1 of the fork 5 is calculated. Furthermore, the CPU
Reference numeral 16 indicates the lift height position H1 of the fork 5 at that time and the reference lift height position H2 stored in advance in the program memory 17.
Compare with. In addition, the reference lifting height position H in this example
2 is a value experimentally determined for the lift height position of the fork 5 when the worker's line of sight of the cargo A is switched from above to the front or from the front to above during cargo handling work.

Then, when the CPU 16 determines that the traveling speed v1 of the forklift is lower than the standard traveling speed V2 and the lifting height position H1 of the fork 5 is higher than the standard lifting height position H2, the worker should not perform cargo handling work at a high place. It is determined that the user is looking upward, and the upper LCD 14 displays cargo handling information consisting of mast 2 inclination angle data, fork 5 lifting height position data, and load data of cargo A. Vehicle running information consisting of remaining amount data, running speed v1 data, and water temperature data is displayed on the lower LCD 15.

Further, when the CPU 6 determines that the traveling speed v1 is equal to or higher than the reference traveling speed ■2, and the lifting height position H1
When it is determined that the lift height is below the standard lift height 1iH2,
It is determined that the worker is directing his/her line of sight forward or downward in order to carry out cargo handling work on the ground or to transport cargo A, and the cargo handling work information is displayed on the lower LCD 15, and the vehicle is moved. Information is displayed on the upper LCD 14.

Next, the operation of the information display device of this embodiment configured as described above will be explained with reference to the flowchart shown in FIG.

When a worker operates a forklift, the CPU
16 reads the detection signal detected by the vehicle speed sensor 10 and calculates the traveling speed V1 of the forklift (step 1, hereinafter, steps are represented by S), and also calculates the traveling speed Vl and the program memory 17 in advance. is compared with the reference running speed ν2 (S2). At this time, the running speed V1 is smaller than the reference running speed ν2 (Vl
<ν2), the CPU 16 detects the lift height position sensor 7
The detection signal detected by is read, and the lifting height position H1 of the fork 5 is calculated (S3), and the lifting height position H1 is compared with a reference lifting height IH2 stored in advance in the program memory 17 (S4).

At this time, if it is determined that the lifting height position H1 is larger than the reference lifting height position H2 () (l>H2), the CPU 16 indicates that the worker is directing his/her line of sight upward to perform cargo handling work at a high location. It is determined that control No. 13 is output to the display drive circuits 19 and 20 to display the cargo handling information on the upper LCD 14 and to display the vehicle running information on the lower LCD 15 (S5).

On the other hand, CPt, '16 is determined in S2 when it is determined that the traveling speed Vl is equal to or higher than the reference traveling speed ■2 (Vl≧V2), and in S4 when the lifting height position H1 is equal to or lower than the standard lifting height position H2 ( When it is determined that H1≦H2), it is determined that the worker is directing his/her line of sight forward or downward in order to perform cargo handling work on the ground or transport cargo A. Then, control signals are output to the display drive circuits 19 and 20 to display the cargo handling information on the lower LCD 15 and the vehicle running information on the upper LCD 14 (S6).

As described above, according to the information display device of this embodiment, cargo handling work information that needs to be checked frequently during cargo handling work is displayed on the LCD located near the worker's line of sight, depending on the direction of the worker's line of sight.
Since the information is displayed at 14.15, the worker does not have to change the direction of his/her line of sight during cargo handling work. Therefore, the work efficiency in cargo handling work is greatly improved compared to the conventional technology.

In addition, since the movement of the line of sight is reduced, information that has not been visually recognized in the past can be easily recognized, making it possible to effectively utilize the information. Furthermore, even if some abnormality occurs in the machine L, the operator can
Since the user is looking at CD14.15, the user notices the occurrence of the abnormality earlier than before, and can therefore take immediate action to deal with the abnormality.

In particular, conventionally, when carrying out cargo handling work at high places, the lifting height position of the fork 5 and the inclination angle of the mast 2 are set using the operating lever based on the worker's intuition and the response when scooping up the plums. However, in this example, the elevation position and inclination angle can be adjusted by adjusting the height position and inclination angle of the LCD14, 15 near the line of sight.
By viewing this display, even inexperienced workers can safely and easily carry out cargo handling operations at heights.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and may be modified and embodied as desired without departing from the spirit of the invention, for example, as described below.

(1) A CRT may be used instead of the LCD 14, 15 as the upper and lower display means.

(2) In the above embodiment, the upper LCD 14 is fixed to the head guard 13, but the upper LCD 14 may be attached to a portion of the pillar so as to be movable up and down using an actuator consisting of a rail, a motor, a gear, or the like.

In this way, when carrying out cargo handling work above, the upper LCD 14 can be moved up to the vicinity of the head guard 13, and when carrying out cargo handling work at approximately eye level of the worker, the upper LCD 14 can be moved upward to the vicinity of the head guard 13.
14 can be moved downward, making it possible to reduce the movement of the line of sight compared to the previous embodiment.

(3) The present invention can also be applied to cargo handling vehicles other than forklifts that are equipped with a lifting member for lifting and lowering the cargo A.

(4) The vehicle speed may be considered as data on the state of cargo handling work, and this may be displayed on the upper LCD 4 or the lower LCD 15.

(5) The lifting speed of the fork 5 of the forklift may be detected and the lifting speed data may be displayed on the LCDs 14 and 15.

[Effects of the Invention] As described in detail above, according to the present invention, cargo handling work information can be displayed on a display device close to the line of sight of the worker, minimizing movement of the line of sight of the worker, This has the excellent effect of improving work efficiency in cargo handling work.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining the operation of an information display device according to an embodiment of the present invention; Fig. 2 is a schematic diagram of a four-crit incorporating the information display device;
The figure is a block diagram showing the electrical configuration of the information display device. In the figure, reference numeral 4 indicates an inclination angle sensor that constitutes part of the cargo handling work state detection means, 5 indicates a fork as a lifting member, 7 indicates a lifting height position sensor that constitutes a part of the cargo handling work state detection means, and 8 indicates cargo handling work. A pressure sensor forming part of the state detection means, 9
11 is a liquid level sensor forming a part of the vehicle running state detection means, 10 is a vehicle speed sensor forming a part of the vehicle running state detection means, and 11 is a vehicle running state t4E, a water temperature sensor forming a part of the detection means. , (2 is the driver's seat, I4 is the upper LCr as the upper display means), 15 is the lower LCD as the lower display means, 16 is the CPU as the control means, 8 is the cargo, H1 is the lifting height position, I2 is the standard lifting height position, Vl is the traveling speed, and ■2 is the standard traveling speed.

Claims (1)

[Scope of Claims] 1. In a cargo handling vehicle that is provided with a vertically movable elevating member for elevating and lowering cargo, a vehicle running state detection means for detecting the running state of the vehicle including the running speed of the vehicle; cargo handling state detection means for detecting the state of cargo handling work including the vertical position of a member; vehicle running information provided by the vehicle running state detection means provided above the driver's seat; and cargo handling work information obtained by the cargo handling state detection means. an upper display means for displaying either one of the above, and an upper display means provided at a position below at least the upper display means of the driver's seat, and displays information different from the upper display means of the vehicle traveling information and the cargo handling information. a lower display means for displaying, the traveling speed detected by the vehicle traveling state detecting means is lower than a predetermined value, and the vertical position of the lifting member detected by the cargo handling work state detecting means is higher than a predetermined value. and a control means for displaying cargo handling work information on an upper display means.