Weight change system

Abstract

To ensure that the forklift can be operated quickly or carefully depending on the ambient brightness.SOLUTION: A weight change system S comprises a brightness identification unit (illuminance sensor 18), a weight change unit 20, and a change command unit 307. The brightness identification unit identifies the brightness around the forklift. The weight change unit 20 changes the weight of the pedal 14 and / or lever 15 of the forklift. The change command unit 307 controls the weight change unit 20 to change the weight of the pedal 14 and / or lever 15 according to the brightness around the forklift.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a system for improving the operability of a forklift truck. [Background technology]

[0002] Patent Document 1 discloses a forklift invention that takes into consideration the safety of forklift operation. This forklift is equipped with a sensor that detects the brightness of the surroundings of the vehicle body. This forklift is configured to slow down its maximum traveling speed compared to normal when the detected brightness of the surroundings is below a predetermined brightness level. This reduces the occurrence of accidents when working in the dark at night or in a dark room. Furthermore, this forklift is configured to slow down its maximum traveling speed the darker the surroundings. In other words, this forklift does not limit its traveling speed when the surroundings are bright, thereby preventing a decrease in work efficiency.

[0003] Incidentally, if a driver has normal visual function, they may be able to compensate for the slight darkness of the surroundings. On the other hand, if the driver's visual function is impaired due to factors such as age-related eye decline, even slight darkness can reduce work efficiency and cause an accident. Furthermore, forklift accidents do not only occur when the vehicle is traveling at maximum speed. For example, during loading and unloading work, drivers often make operational errors due to visual misjudgment in dark work areas, resulting in accidents. Therefore, in dark work areas, it is important to have drivers operate carefully to reduce operational errors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-278599 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the problem to be solved by the present invention is to provide a system that can operate a forklift quickly or carefully depending on the brightness of the surroundings. [Means for solving the problem]

[0006] In order to solve the above problem, the weight change system according to the present invention comprises: 1. A system for use in a forklift, comprising: a brightness determination unit that determines the brightness around the forklift; a weight changing unit that changes the weight of a pedal and / or lever of the forklift; The forklift is provided with a change command unit that controls the weight change unit to change the weight of the pedal and / or the lever according to the brightness around the forklift.

[0007] The weight change system preferably comprises: The change command unit further controls the weight change unit to change the weight of the pedal and / or lever depending on the level of the driver's visual function.

[0008] The weight change system preferably comprises: The driver's eye functions include depth perception, visual acuity, dynamic visual acuity, and / or visual field.

[0009] The weight change system preferably comprises: The change command unit further controls the weight change unit to change the weight of the pedal and / or lever in accordance with the age of the driver.

[0010] The weight change system preferably comprises: A trained model that uses the brightness around the forklift and the driver's eye function score as input data and pre-machines the correlation between them using training data that has the driver's skill score as output data, and outputs the driver's skill score when the brightness around the forklift and the driver's eye function score are input; a weight determination unit that determines the weight of the pedal and / or lever appropriate for the driver based on the driver's skill score output by the trained model; The change command unit changes the weight of the pedal and / or lever to the determined weight.

[0011] The weight change system preferably comprises: A trained model that uses the brightness around the forklift and the driver's age as input data and pre-machines the correlation between them using training data with the driver's skill score as output data, and outputs the driver's skill score when the brightness around the forklift and the driver's age are input; a weight determination unit that determines the weight of the pedal and / or lever appropriate for the driver based on the driver's skill score output by the trained model; The change command unit changes the weight of the pedal and / or lever to the determined weight.

[0012] The weight change system preferably comprises: a trained model that uses the brightness around the forklift, the driver's eye function score, and the driver's age as input data and pre-machines the correlation between them using training data that has the driver's skill score as output data, and that outputs the driver's skill score when the brightness around the forklift, the driver's eye function score, and the driver's age are input; a weight determination unit that determines the weight of the pedal and / or lever appropriate for the driver based on the driver's skill score output by the trained model; The change command unit changes the weight of the pedal and / or lever to the determined weight.

[0013] The weight change system preferably comprises: a measurement unit for measuring the eye function of a driver; a display; and The measurement unit measures the driver's eye function using the display.

[0014] The weight change system preferably comprises: a memory unit that stores eye function scores of a plurality of drivers; The vehicle further includes a driver identification unit that identifies the driver who is in the vehicle.

[0015] In order to solve the above problems, the forklift according to the present invention comprises: The weight change system according to any one of claims 1 to 3 is provided.

[0016] In order to solve the above problem, a weight change program according to the present invention includes: The program is used in a weight change system comprising a weight change unit for changing the weight of the pedal and / or lever of a forklift, a brightness specifying unit for specifying the brightness around the forklift, and a computer, and causes the computer to control the weight change unit to change the weight of the pedal and / or lever according to the brightness around the forklift. [Effects of the Invention]

[0017] The weight change system according to the present invention can operate the forklift quickly or carefully depending on the brightness of the surroundings. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a side view of a forklift equipped with a weight change system according to a first embodiment of the present invention. [Figure 2]FIG. 1 is a block diagram of a weight change system. [Figure 3] FIG. 10 is a diagram showing a screen when measuring stereopsis. [Figure 4] FIG. 10 is a diagram showing a screen when measuring stereopsis. [Figure 5] FIG. 1 illustrates the operation of a trained model. [Figure 6] FIG. 1 is a flow diagram illustrating the operation of the weight modification system. [Figure 7] FIG. 10 is a block diagram of a variation of the weight change system. [Figure 8] FIG. 10 is a block diagram of another variation of the weight modification system. [Figure 9] FIG. 10 is a block diagram of yet another variation of the weight modification system. [Figure 10] FIG. 10 is a block diagram of yet another variation of the weight modification system. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the weight change system according to the present invention will be described with reference to the accompanying drawings. The weight change system S according to this embodiment is configured to change the weight of both the pedal and the lever, but this is merely an example, and the weight change system according to the present invention may be configured to change the weight of either the pedal or the lever.

[0020] <Forklift configuration> FIG. 1 is a side view of a forklift 1 equipped with a weight change system S. First, the configuration of the forklift 1 will be described. The forklift 1 is a battery-powered counter-balanced forklift. As shown in FIG. 1, the forklift 1 is equipped with a plurality of wheels 10, a vehicle body 11, a driver's seat 12, a head guard 13, pedals 14, a lever 15, left and right masts 16, left and right forks 17, an illuminance sensor 18, a display 19, a weight change unit 20 (see FIG. 2), and a control unit 30 (see FIG. 2). The illuminance sensor 18 corresponds to the "brightness identification unit" of the present invention. A system equipped with the illuminance sensor 18, the display 19, the weight change unit 20, and the control unit 30 is the weight change system S of this embodiment.

[0021] A plurality of wheels 10 are provided on all four sides of a vehicle body 11. A driver's seat 12 is provided on the vehicle body 11, and a head guard 13 is provided above the driver's seat 12.

[0022] The pedals 14 include an accelerator pedal, a brake pedal, and an inching pedal, and are provided below the driver's seat 12. In the present invention, the "pedals" may include at least one of the accelerator pedal, the brake pedal, and the inching pedal, but may not include all of these pedals.

[0023] The lever 15 has a lift lever and a tilt lever, and is provided in front of the driver's seat 12. The lever 15 may have a slide lever for sliding the fork 17 left and right. The "lever" in the present invention may have at least one lever such as a lift lever and a tilt lever, and does not necessarily have to have all of these levers.

[0024] The left and right forks 17 are configured to be able to be raised and lowered via the left and right masts 16, and the operator H operates a lift lever to raise and lower the forks 17 to perform cargo handling work.

[0025] The illuminance sensor 18 is disposed on the upper surface of the head guard 13 and is configured to detect the brightness (illuminance [lx]) around the forklift 1. The location of the illuminance sensor 18 is merely an example and is not limited thereto. For example, the illuminance sensor 18 may be disposed in the driver's seat 12, the mast 16, etc.

[0026] The display 19 is a 3D display, and is fixed to the head guard 13 in front of the driver's seat 12. The position of the display 19 is merely an example and is not limited to this. The display 19 displays a measurement screen by a measurement unit 302 (see FIG. 2) described later. The display 19 also displays an age input screen by an age acquisition unit 301 described later. The display 19 in this embodiment is configured as a touch panel, and the driver H can make input by touching the display 19. The "display" in the present invention does not necessarily have to be a 3D display.

[0027] The weight change unit 20 changes the weight of the lever 15 and the pedal 14 when operated based on commands from a change command unit 307 (see FIG. 2) which will be described later. The weight change unit 20 has a pedal weight change unit that changes the weight of the pedal 14, and a lever weight change unit that changes the weight of the lever 15. Note that if the weight change unit 20 is configured to change the weight of either the pedal 14 or the lever 15, it will have either a pedal weight change unit or a lever weight change unit.

[0028] The pedal weight change unit changes the weight of the pedal 14 when the driver H presses it down, based on a command from the change command unit 307. The pedal weight change unit is configured by, for example, a device that can adjust the weight by hydraulic pressure or a device that can adjust the weight by a spring.

[0029] Furthermore, for example, the pedal weight change unit may be an assist device that assists the depression force of the pedal 14. In this case, the pedal weight change unit may adjust the assist force based on a command from the change command unit 307, and may substantially change the weight of the pedal 14 when the driver H depresses it.

[0030] Alternatively, the pedal weight change unit may be configured to change the magnitude of the power or braking force of each device responsive to the amount of depression force of the pedal 14, for example, based on a command from the change command unit 307. In this way, the pedal weight change unit effectively changes the weight of the pedal 14.

[0031] The lever weight changing section is configured by, for example, a device that can adjust the weight of the lever 15 by hydraulic pressure, or a device that can adjust the weight of the lever 15 by a spring.

[0032] Furthermore, for example, the lever weight change unit may be an assist device that assists in the operation according to the weight of the lever 15. In this case, the lever weight change unit may adjust the assist force based on a command from the change command unit 307, and may substantially change the weight of the lever 15 when the driver H operates it.

[0033] Alternatively, the lever weight change unit may be configured to change the magnitude of the power of each device responsive to the amount of operation of the lever 15, for example, based on a command from the change command unit 307. In this way, the lever weight change unit effectively changes the weight of the lever 15.

[0034] The control unit 30 is configured by a computer arranged inside the vehicle body 11, and has an arithmetic unit, a storage device, and a memory. The storage device stores a weight change program that causes the computer to function as an age acquisition unit 301, a measurement unit 302, a trained model 303, a weight determination unit 305, and a change command unit 307, which will be described later.

[0035] <Functional configuration> Next, a description will be given of the functional configuration of the weight change system S. As shown in Fig. 2, the control unit 30 has an age acquisition unit 301, a measurement unit 302, a trained model 303, a weight determination unit 305, and a change command unit 307.

[0036] The age acquisition unit 301 displays an age input screen on the display 19 and prompts the driver H to input his / her age. The age acquisition unit 301 may prompt the driver H to input an age range, such as 30s or 40s. The age acquisition unit 301 may also prompt the driver H to input the year of birth, and calculate the age of the driver H based on that year.

[0037] The lens of the human eye (crystalline lens) becomes cloudy with age. It is known that this cloudiness makes it more susceptible to diffuse reflection. In bright places, the pupil dilates narrowly, making diffuse reflection less likely, but in dark places, the pupil dilates wider, making diffuse reflection more likely to occur from the lens. As a result, elderly people find it more difficult to see in dark places, and are more likely to experience a decline in their eye function in dark places. When this decline in eye function occurs, the eyes become more prone to fatigue, and as a result, elderly people experience further decline in eye function due to eye strain. In this way, eye function in dark places is closely related to age.

[0038] The measurement unit 302 measures the eyesight, dynamic visual acuity, depth perception, and visual field of the driver H using the display 19. The measurement method will be described in detail below.

[0039] The measurement unit 302 simply measures the visual acuity of the driver H by a known measurement method using the display 19. Specifically, the measurement unit 302 displays a Landolt ring (C mark) on the display 19 while changing its size and orientation, and prompts the driver to answer the orientation of the displayed Landolt ring. Then, the measurement unit 302 simply identifies the visual acuity of the driver H based on the answer result. The measurement unit 302 receives the answer from the driver H by prompting the driver H to select an option to be displayed on the display 19.

[0040] Next, the measurement unit 302 simply measures the dynamic visual acuity of the driver H by a known measurement method using the display 19. Specifically, the measurement unit 302 displays a Landolt ring or a row of multiple (for example, four) numbers while moving it smoothly from right to left or left to right, and asks the driver H to answer the orientation of the Landolt ring or the displayed numbers. Then, the measurement unit 302 repeats these steps and simply identifies the dynamic visual acuity of the driver H based on the answer results.

[0041] While it is necessary for the driver H of the forklift 1 to recognize stationary objects, it is also very important for him or her to recognize surrounding objects while driving and the movement of objects being handled. It is also known that while eyesight is relatively unaffected by aging, dynamic visual acuity deteriorates with age. Therefore, the measuring unit 302 measures not only eyesight but also dynamic visual acuity, thereby enabling more accurate measurement of the eye function of the driver H that affects the operation of the forklift 1.

[0042] Next, the measurement unit 302 simply measures the stereopsis of the driver H by a known measurement method using the display 19. Specifically, this is a method simulating the so-called three-rod method, in which the measurement unit 302 displays bars P1 and P2 on the left and right sides of the screen, and a bar P3 in the center, as shown in FIG. 3. The measurement unit 302 then gradually changes the thickness of the bar P3 between the screens D1 and D2, and asks the driver H to respond when the thickness of the bar P3 becomes the same as the thickness of the bars P1 and P2 on the left and right. The measurement unit 302 then repeats this process and simply identifies the stereopsis of the driver H based on the response results.

[0043] Alternatively, the measurement unit 302 may simulate the three-rod method by utilizing a 3D display function, as shown in Fig. 4. First, the measurement unit 302 displays three rods P1, P2, and P3 on the screen, and moves the central rod P3 back and forth between the screens D1 and D2. The measurement unit 302 then prompts the driver H to respond when the front-to-back position of the central rod P3 overlaps with the front-to-back positions of the left and right rods P1 and P2, and measures the deviation. The measurement unit 302 repeats this process and simply identifies the driver H's depth perception based on the measurement results.

[0044] In this embodiment, the measurement unit 302 uses a 3D display to display a stereoscopic image, and measures the driver H's stereoscopic vision while allowing the driver H to recognize the depth of the image. This allows the measurement unit 302 to measure the driver H's stereoscopic vision more accurately than measurements using a 2D display. The weight change system S can evaluate the degree to which the driver H can judge the distance to an object or obstacle by measuring the driver's stereoscopic vision.

[0045] Finally, the measurement unit 302 simply measures the visual field of the driver H by a known measurement method using the display 19. For example, the measurement unit 302 may measure the visual field of the driver H by a method such as that disclosed on the following web page: ·https: / / www.eye-frail.jp / selfcheck / glaucoma /

[0046] Even if driver H has good eyesight, dynamic vision, and depth perception, if he has a defect in his visual field, he will be unable to see certain parts. Therefore, the weight change system S can evaluate the eye function of driver H more accurately by also measuring the visual field of driver H. The measurement of driver H's visual field may include not only the defect in his visual field but also the range of his visual field.

[0047] The above-described method of measuring the eye function by the measuring unit 302 is merely an example, and the measuring method by the measuring unit 302 can be freely selected from known measuring methods and is not limited to the above-described measuring method. Furthermore, the weight change system S may be provided with a head-mounted display or VR (Virtual Reality) goggles instead of the display 19, and the eye function of the driver H may be measured using the head-mounted display or VR goggles.

[0048] The trained model 303 uses the brightness (illuminance) around the forklift 1, the scores of each eye function of the driver H, and the age of the driver H as input data, and has previously machine-learned the correlation between them using training data in which the skill score of the driver H is output data. The "skill score" according to the present invention is a score of skills related to loading and unloading work of the forklift 1. The skill score includes either or both of driving skills and loading and unloading skills.

[0049] In order to learn the correlation between the scores of each eye function and other elements with greater accuracy, for example, one method is to have the same driver H perform loading and unloading work while wearing glasses that impair eyesight, glasses that impair dynamic vision, glasses that impair depth perception, and glasses that narrow the field of view (or cause defects in the field of view), and then use the skill score at that time.This method makes it possible to properly learn the effect on skill scores due to differences in eye function.

[0050] In addition, in order to learn the correlation between the brightness around the forklift 1 and other factors, one method is to adjust the luminous flux using the LED light function, change the brightness around the forklift 1 while the forklift 1 performs loading and unloading work, and use the skill score at that time.

[0051] The trained model 303 has previously machine-learned the correlation between the brightness around the forklift 1, the scores for each of the driver H's eye functions, and the driver H's age and the skill score, and when the brightness around the forklift 1, the scores for each of the driver H's eye functions, and the driver H's age are input, the trained model 303 outputs the driver H's skill score, as shown in Figure 5.

[0052] The eye functions of the driver in the trained model according to the present invention may include at least one of visual acuity, dynamic visual acuity, depth perception, and field of view.

[0053] The weight determination unit 305 determines the weight of the pedal 14 and the lever 15 suitable for the driver H based on the skill score of the driver H output by the trained model 303. For example, the weight determination unit 305 may be configured to increase the weight of the pedal 14 and the lever 15 when the skill score of the driver H is less than a predetermined skill score, and to decrease the weight of the pedal 14 and the lever 15 when the skill score of the driver H is equal to or greater than the predetermined skill score.

[0054] The change command unit 307 controls the weight change unit 20 to change the weight of the pedal 14 and the lever 15 to the weight determined by the weight determination unit 305. The weight change system S changes the weight of the pedal 14 and the lever 15 according to the brightness around the forklift 1 and the age and level of visual function of the driver H, so that the driver H can operate the forklift 1 quickly when the forklift 1 is surrounded by bright light and has good visual function, and can operate the forklift 1 carefully when the forklift 1 is surrounded by dark light and has poor visual function.

[0055] <Weight change system flow> Next, the operation of the weight change system S will be explained again with reference to the flow chart of FIG.

[0056] (1) First, the weight change system S acquires the age of the driver H using the age acquisition unit 301 (see S1 in FIG. 6), and then measures each eye function of the driver H using the measurement unit 302 (see S2 in FIG. 6).

[0057] (2) Next, the weight change system S acquires the brightness of the surroundings of the forklift 1 using the illuminance sensor 18 (see S3 in FIG. 6).

[0058] (3) Next, the weight change system S inputs the age of the driver H, the measurement results of each eye function, and the brightness (illuminance) around the forklift 1 into the trained model 303 (see S4 in Figure 6), and outputs the skill score (see S5 in Figure 6).

[0059] (4) Next, the weight change system S determines the weight of the pedal 14 and the lever 15 based on the skill score using the weight determination unit 305 (see S6 in FIG. 6).

[0060] (5) Next, the weight change system S changes the weight of the pedal 14 and the lever 15 to the determined weight by the weight change unit 20 (see S7 in FIG. 6).

[0061] In this way, the weight change system S changes the weight of the pedal 14 and the lever 15 according to the brightness around the forklift 1, the driver's age, and the level of each of the driver's eye functions, so that if the area around the forklift 1 is bright and the driver H has good eye function, the system can make the driver operate the forklift 1 quickly, and if the area around the forklift 1 is dark and the driver H has poor eye function, the system can make the driver operate the forklift 1 carefully. Furthermore, by having the trained model 303 learn the correlation between age and other factors, the system can estimate the skill score taking into account eye fatigue that occurs over time and eye function that cannot be measured by measuring eye function using the display 19, and can set the weight of the pedal 14 and the lever 15 to be more suitable for the driver H.

[0062] Although one embodiment of the weight change system according to the present invention has been described above, the present invention is not limited to the above embodiment. The weight change system according to the present invention may be implemented, for example, in each of the following modifications or in appropriate combination with each modification.

[0063] <Modification> The forklift 1 may be a reach forklift. In this case, the pedal 14 may include a presence pedal. The forklift 1 may also be an engine-powered forklift. In this case, the pedal 14 may include a clutch pedal. Furthermore, if the forklift 1 is a reach forklift, the lever 15 may include an accelerator lever. As described above, the "pedal" in the present invention includes at least one of the pedals, and the "lever" includes at least one of the levers, and the weight change system S according to the present invention changes the weight of at least one of the levers and pedals.

[0064] Any of the components of the control unit 30 may be configured, for example, by a server computer installed on the cloud. By communicating with this server computer, the weight of the pedal 14 and / or the lever 15 can be changed.

[0065] The brightness identification unit may have a plurality of illuminance sensors arranged in the building or warehouse, and a position identification unit that identifies the position of the forklift 1. In this case, the brightness identification unit identifies the brightness around the forklift 1 using an illuminance sensor that is close to the position of the forklift 1.

[0066] Alternatively, the brightness identification unit may have, for example, instead of the illuminance sensor 18, a storage unit that stores the illuminance distribution within the floor together with position information, and a position identification unit that identifies the position of the forklift 1. In this case, the brightness identification unit obtains the brightness around the forklift 1 from the obtained position of the forklift 1 and the illuminance of the floor corresponding to that position. As described above, the weight change system according to the present invention is not particularly limited in terms of the configuration of the brightness identification unit or the method of obtaining brightness.

[0067] For example, as shown in FIG. 7 , the weight change system S may further include a memory unit 311 storing the eye function scores and / or ages of multiple drivers H, instead of the measurement unit 302, and a driver identification unit 312 identifying the driver H who is in the vehicle. In this case, the weight change system S may further include, for example, a camera 21, and the memory unit 311 may further store a facial image for each driver H. The driver identification unit 312 identifies the driver H who is in the vehicle by referring to the facial image of the driver H generated by the camera 21 and the facial image stored in the memory unit 311. Next, the trained model 303 receives the eye function scores and / or ages of the driver H stored in the memory unit 311 as input and outputs the skill score of the driver H. Note that the method by which the driver identification unit 312 identifies the driver H is not particularly limited. For example, the driver identification unit 312 may identify each driver H by reading a card or the like held by each driver H.

[0068] The weight change system S may change the weight of the pedal 14 and / or the lever 15 based on the brightness around the forklift 1 and the eye function score of the driver H, without taking the age of the driver H into consideration. In this case, as shown in FIG. 8, for example, the weight change system S does not include an age acquisition unit 301, and the trained model 303 uses the brightness around the forklift 1 and the eye function score of the driver H as input data and machine-learns the correlation therebetween in advance using training data having the skill score of the driver H as output data, and outputs the skill score of the driver H when the brightness around the forklift 1 and the eye function score of the driver H are input. In this way, the weight change system S can at least prevent accidents caused by the darkness around the forklift 1 or the poor eye function of the driver H.

[0069] The weight change system S may change the weight of the pedal 14 and / or the lever 15 based on the age of the driver H and the brightness around the forklift 1, instead of the eye function score of the driver H. In this case, as shown in FIG. 9, for example, the weight change system S does not include a measurement unit 302, and the trained model 303 uses the brightness around the forklift 1 and the age of the driver H as input data and trains the correlation between them in advance by machine learning using training data having the skill score of the driver H as output data, and outputs the skill score of the driver H when the brightness around the forklift 1 and the age of the driver H are input. In this way, the weight change system S can at least prevent accidents caused by operating errors related to the darkness around the forklift 1 and the age of the driver H.

[0070] The weight change system S may change the weight of the pedal 14 and / or the lever 15 based on the brightness around the forklift 1, regardless of the driver H's eye function score or age. In this case, as shown in FIG. 10 , the weight change system S does not include the display 19, the age acquisition unit 301, the measurement unit 302, and the trained model 303, and the weight determination unit 305 determines the weight of the pedal 14 and / or the lever 15 according to the brightness (illuminance) around the forklift 1. In this case, the weight determination unit 305 may increase the weight of the pedal 14 and / or the lever 15 when the brightness around the forklift 1 is less than 150 [lx], which is required for loading and unloading work, or decrease the weight of the pedal 14 and / or the lever 15 when the brightness around the forklift 1 is 500 [lx] or more. As a result, the change command unit 307 controls the weight change unit 20 to change the weight of the pedal 14 and / or the lever 15 according to the brightness around the forklift 1. As a result, the weight change system S allows the driver H to operate the forklift 1 carefully when it is dark around the forklift 1, and allows the driver H to operate the forklift 1 quickly when it is bright around the forklift 1. [Explanation of symbols]

[0071] S Weight Change System H Driver 1 forklift 10 wheels 11 Body 12 Driver's seat 13 Head guard 14 pedals 15 Lever 16 Mast 17. Fork 18 Illuminance sensor (brightness determination part) 19 Display 20 Weight change section 21 Camera 30 Control Unit 301 Age Acquisition Department 302 Measuring part 303 trained models 305 Weight determination unit 307 Change Order Department 311 Storage section 312 Driver Identification Department

Claims

1. 1. A system for use in a forklift, comprising: a brightness determination unit that determines the brightness around the forklift; a weight changing unit that changes the weight of the pedal and / or lever of the forklift; a weight change command unit that controls the weight change unit to change the weight of the pedal and / or the lever in accordance with the brightness around the forklift.

2. 2. The weight change system according to claim 1, wherein the change command unit further controls the weight change unit to change the weight of the pedal and / or the lever depending on the level of the driver's visual function.

3. The weight changing system according to claim 2 , wherein the eye functions of the driver include all or any of depth perception, visual acuity, dynamic visual acuity, and visual field.

4. The weight change system according to any one of claims 1 to 3, wherein the change command unit further controls the weight change unit to change the weight of the pedal and / or the lever according to the age of the driver.

5. a trained model that uses the brightness around the forklift and the eye function score of the driver as input data and pre-machines learning of the correlation therebetween using training data that has the driver's skill score as output data, and that outputs the skill score of the driver when the brightness around the forklift and the eye function score of the driver are input; a weight determination unit that determines a weight of the pedal and / or the lever suitable for the driver based on the skill score of the driver output by the trained model; 4. The weight change system according to claim 2, wherein the change command unit changes the weight of the pedal and / or the lever to the determined weight.

6. a trained model that uses the brightness around the forklift and the age of the driver as input data and pre-machines learning of the correlation therebetween using teacher data that has the skill score of the driver as output data, and that outputs the skill score of the driver when the brightness around the forklift and the age of the driver are input; a weight determination unit that determines a weight of the pedal and / or the lever suitable for the driver based on the skill score of the driver output by the trained model; The weight change system according to claim 1 , wherein the change command unit changes the weight of the pedal and / or the lever to the determined weight.

7. a trained model that uses the brightness around the forklift, the eye function score of the driver, and the age of the driver as input data and pre-machines the correlation therebetween using training data that has the skill score of the driver as output data, and that outputs the skill score of the driver when the brightness around the forklift, the eye function score of the driver, and the age of the driver are input; and a weight determination unit that determines a weight of the pedal and / or the lever suitable for the driver based on the skill score of the driver output by the trained model, The weight change system according to claim 1 , wherein the change command unit changes the weight of the pedal and / or the lever to the determined weight.

8. a measurement unit for measuring the eye function of the driver; a display; and The weight change system according to claim 2 or 3, wherein the measurement unit measures the eye function of the driver by using the display.

9. a storage unit that stores a plurality of scores of the driver's eye function; The weight change system according to claim 2 or 3, further comprising: a driver identification unit that identifies the driver who is in the vehicle.

10. A forklift truck equipped with the weight changing system according to any one of claims 1 to 3.

11. A program used in a weight change system including a weight change unit that changes the weight of a pedal and / or lever of a forklift, a brightness determination unit that determines the brightness around the forklift, and a computer, The computer, a weight change program that controls the weight change unit to change the weight of the pedal and / or the lever according to the brightness around the forklift;

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