Work vehicle user management system

Abstract

To provide a work vehicle user management system that can improve security and facilitate management of work status of a user of a work vehicle.SOLUTION: A work vehicle user management system 1 performs user management tasks including user authentication based on user information input via a display unit 60 provided on a work vehicle 10. A control unit 23 determines whether a user identification ID input via the display unit 60 matches a registered user identification ID registered in advance, and if the user identification ID matches the registered user identification ID registered in advance, determines whether an engine start button has been pressed for a predetermined period of time or longer, and starts the engine if the engine start button has been pressed for the predetermined period of time or longer.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a user management system for a work vehicle. [Background technology]

[0002] As a working vehicle such as a construction machine, for example, a crawler-type skid steer loader is widely known. The vehicle body of such a working vehicle is provided with an arm that moves up and down and has an attachment such as a bucket detachably attached to the tip. By swinging the bucket up and down, for example, various tasks such as moving excavated soil can be performed. By detaching and replacing the attachment according to the purpose of the work, various tasks can be performed.

[0003] Furthermore, this type of work vehicle has a cabin on top of the vehicle that the user sits in. Inside the cabin, near the operator seat on which the user sits, there are provided a first operating lever for operating the work vehicle to travel and a second operating lever for operating an attachment such as a bucket (see Patent Document 1).

[0004] A display device (monitor) is provided in the cabin of a work vehicle such as a construction machine to allow a user to visually check the operating status of the work vehicle (for example, whether the engine is on or off) (see Patent Document 1). This display device changes the type of screen displayed when the user switches the display screen, and displays various screens, such as a screen showing the status of each part of the work vehicle, such as water temperature and oil temperature, and a screen related to maintenance. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2022-56577 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, starting an engine is performed by inserting a key into the key cylinder and turning the key to the engine start position. This operation is the same for all users. In recent years, user task management has become very important in order to improve work efficiency. Also, from the viewpoint of security, it is important that each user has a different user identification ID.

[0007] The present invention has been made in consideration of such problems, and aims to provide a user management system for work vehicles that improves security and makes it easy to manage the work status of users in work vehicles. [Means for solving the problem]

[0008] [1] The user management system for a work vehicle of this embodiment is a user management system for a work vehicle that performs user management tasks including user authentication based on user information input via a display unit provided on the work vehicle. The user management system for a work vehicle has a control unit that determines whether or not the user identification ID input via the display unit matches a registered user identification ID that has been registered in advance. When the user identification ID matches the registered user identification ID that has been registered in advance, the control unit determines whether or not the engine start button has been pressed for a predetermined time or more, and starts the engine when the engine start button has been pressed for a predetermined time or more. Therefore, only workers who have been successfully authenticated as users can start the engine, improving security and safety. Furthermore, since the user identified by user authentication can be linked to the work history including subsequent engine starts, more detailed user management can be easily performed. [2] In the user management system for a work vehicle of this embodiment, it is preferable to have at least a database and a registration processing unit. The database stores user information having a user identification ID and user work history information including setting information for the mechanisms of the work vehicle. The registration processing unit registers and updates the user identification ID and user work history information stored in the database in response to access including input by the user to the display unit. The registered and updated user identification ID and user work history information are displayed on the display unit. As a result, since the work history information is displayed for each user, for example, various operation settings from the previous use can be known, eliminating the need to reset the settings from scratch each time, and improving work efficiency. [3] In the user management system for work vehicles of this embodiment, the users include an administrator and an actual user, and it is preferable that the administrator and the actual user have different scopes of access authority to user information. By clarifying the scope of authority of the administrator and the actual user, the operational scope of the administrator and the actual user can be differentiated, which allows for smooth work management. [4] In the user management system for work vehicles of this embodiment, a different RFID tag is distributed to each user, and the control unit determines whether the tag user ID attached to the RFID tag matches a pre-registered tag user ID. If the tag user ID matches a pre-registered tag user ID, the control unit determines whether the engine start button has been pressed for a predetermined period of time or more, and starts the engine if the engine start button has been pressed for a predetermined period of time or more. This functions as another authentication means using the RFID tag when user authentication performed from the display unit fails, so that user authentication processing is more reliably performed. Effect of the Invention

[0009] The work vehicle user management system of the present invention can improve security and facilitate management of the work status of a user in a work vehicle. [Brief description of the drawings]

[0010] [Figure 1]1 is a perspective view of a work vehicle on which a work vehicle user management system according to an embodiment is mounted, as viewed obliquely from the front side; [Diagram 2] 1 is a block diagram showing a configuration of a work vehicle user management system according to an embodiment. [Diagram 3] FIG. 2 is a block diagram showing a configuration of a control unit. [Figure 4] FIG. 2 is a block diagram showing a configuration of a database. [Diagram 5] 10 is a flowchart illustrating a user authentication process of the control unit. [Figure 6] FIG. 2 is a diagram illustrating a process flow from user authentication to engine start. [Figure 7] FIG. 13 is a diagram showing a language setting screen for characters, etc.; [Figure 8] FIG. 13 is a diagram showing an operation setting screen for each mechanism of the work vehicle. [Figure 9] FIG. 13 is a diagram showing a user's work history information screen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In the following description, when discussing up, down, left, and right, the bottom side of the work vehicle 10 will be referred to as the bottom and the side opposite the bottom as the top, and the left side of the work vehicle 10 when viewed from the rear will be referred to as the left, and the right side will be referred to as the right.

[0012] [Work vehicle configuration] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The user management system 1 for a work vehicle according to the embodiment will be described by taking a crawler-type skid steer loader with a bucket attached to the tip of an arm as an example of a work vehicle. FIG. 1 is a perspective view of a work vehicle on which a user management system for a work vehicle according to the embodiment is mounted, seen from an oblique front side. In addition, the external configuration of a work vehicle 10 according to the embodiment does not constitute the gist of the present invention, so it will be described only briefly. FIG. 2 is a block diagram showing the configuration of a user management system for a work vehicle 1 according to the embodiment. FIG. 3 is a block diagram showing the configuration of a control unit. FIG. 4 is a block diagram showing the configuration of a database. FIG. 5 is a flow chart for explaining user authentication processing of the control unit. FIG. 6 is a diagram showing a schematic diagram of a process flow from user authentication to engine start. FIG. 7 is a diagram showing a language setting screen for characters, etc. FIG. 8 is a diagram showing an operation setting screen for each mechanism of the work vehicle. FIG. 9 is a diagram showing a user's work history information screen. In FIG. 2 to FIG. 9, the same components as those shown in FIG. 1 are assigned the same reference numerals.

[0013] 1, the work vehicle 10 has a traveling device 12, a main body frame 13 on which the traveling device 12 and the like are mounted, and a cabin 25 provided in the upper center of the main body frame 13. The traveling device 12 has left and right endless tracks (hereinafter referred to as "crawlers") 11a, 11b, a hydraulic pump 30, and a hydraulic motor 40. The work vehicle 10 has the main body frame 13 to which the traveling devices 12 are attached on the left and right, and the cabin 25 provided in the upper center of the main body frame 13.

[0014] The cabin 25 is formed in a box shape, and an operator seat 61 is provided inside the cabin 25, where the user sits facing the front of the vehicle. Inside the cabin 25, operation levers 20 (right operation lever 20R, left operation lever (not shown)) for driving the work vehicle 10 and operating attachments such as a bucket are provided near the seat. In addition, a display unit 60 is provided near the operation lever 20 in a position that is easily visible to the user, for displaying a menu screen for accepting user authentication processing from the user, the operating status of the work vehicle (lever operation sensitivity, etc.), the maintenance status, etc. The type of screen displayed on this display unit 60 is changed by a user's operation to switch the display screen.

[0015] The work vehicle 10 is also provided with an engine 21 (see FIG. 2) at a position rearward of the cabin 25. The engine 21 is covered by left and right body frames 13. A first ECU (Electronic Control Unit: vehicle ECU) 22 (see FIG. 2) that functions as a control unit that comprehensively controls the operations of the hydraulic pump 30 (see FIG. 2) and the display unit 60, a second ECU 32 (engine ECU) that controls the engine 21, and a battery (not shown) are provided inside the left and right body frames 13. The first ECU 22 is electrically connected to the second ECU 32, the hydraulic pump 30, the display unit 60, and the battery. The second ECU 32 is electrically connected to the engine 21 and the battery.

[0016] The hydraulic pump 30 is driven by the engine 21. The hydraulic motor 40 is composed of a left hydraulic motor 140 and a right hydraulic motor 141, and is rotated by pressure oil (operating oil) discharged from the hydraulic pump 30. The pressure oil of the hydraulic pump 30 is supplied to and discharged from the left hydraulic motor 140 and the right hydraulic motor 141, respectively, by a control signal from a hydraulic pump control unit (not shown) constituting the control unit 130. The left crawler 11a is driven by the left hydraulic motor 140, and the right crawler 11b is driven by the right hydraulic motor 141. In other words, the left crawler 11a and the right crawler 11b are driven independently. Note that, although the present embodiment is described assuming the case where there is one hydraulic pump 30, a total of two hydraulic pumps, one corresponding to the left hydraulic motor and one corresponding to the right hydraulic motor, may be provided.

[0017] A first rotation speed sensor (not shown) and a second rotation speed sensor (not shown) are attached to the left and right hydraulic motors 40, respectively, to measure the rotation speed of the hydraulic motor 40. The rotation speeds detected by the first rotation speed sensor and the second rotation speed sensor are transmitted to the first ECU 22. The first ECU 22 determines whether or not to perform a traveling operation control, which will be described later, based on the traveling speeds of the crawlers 11a, 11b based on the rotation speeds detected by the first and second rotation speed sensors and on traveling mode information, which will be described later.

[0018] In addition, a 270-degree camera (auto-reverse camera) 50 is attached to the upper right side of the cabin 25, a 270-degree camera (auto-reverse camera) 52 is attached to the upper left side, and a 270-degree camera (auto-reverse camera) 54 is attached to the upper back side. These 270-degree cameras (auto-reverse cameras) 50, 52, 54 capture images of the surroundings of the work vehicle 10, and the image data is displayed on a display unit 60.

[0019] [User Management System] The following describes the work vehicle user management system 1 that performs user management based on information input by the user (user information: user identification information, user work history information, etc., described later), with reference to Figs. 2 to 5.

[0020] The user management system 1 for a work vehicle includes a first ECU 22, a database 24, a second ECU 32, an operation lever sensor 27, 270-degree cameras 50, 52, 54, and a display unit 60. The first ECU 22 includes a control unit 23. The first ECU 22 is configured, for example, by a microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output port, and a communication port (not shown). Examples of signals input to the first ECU 22 include rotation speed information of the left and right drive shafts from rotation speed sensors provided independently on the left and right. Various control signals are output from the first ECU 22 via the output port. Examples of signals output from the first ECU 22 include a control signal to the hydraulic pump 30.

[0021] The operating lever sensor 27 is an angle sensor provided on the operating lever 20 (e.g., a joystick) that can be tilted forward, backward, left, and right, and can be, for example, a potentiometer. The operating lever sensor 27 detects whether the operating direction of the operating lever is within a range (180 degrees) from forward (meaning going straight) to left and right (meaning movement in the left and right direction) and whether the tilt amount exceeds a predetermined tilt amount, based on the lever angle. For example, if the predetermined tilt amount is set to the maximum tilt amount (so-called full lever), when the operating lever is tilted forward to the upper limit, it is detected as going straight and being in the full lever state. Note that the detection method is not limited to this as long as it can detect the above-mentioned movements.

[0022] The display unit 60 is a touch panel monitor, and functions as a user interface that allows information to be input. This touch panel monitor has a display panel and a touch panel. The display panel is a liquid crystal panel or an organic EL (Electro Luminescence) panel, and displays various graphic information, text information, and buttons. The touch panel is provided over the display panel, and may be of the resistive or capacitive type.

[0023] The control unit 23 has a control unit (main controller) 130, an input unit 133, and an output unit 134. The control unit 130 has a determination unit 131, a registration processing unit 132, and a display control unit 136. The display control unit 136 receives the authentication result of user authentication based on input information from the input unit 133 and the determination result regarding engine start from the determination unit 131 based on selection information of the user, which will be described later, and generates and outputs a control signal for displaying the authentication result and the determination result.

[0024] The control unit 130 also generates and outputs a control signal for adjusting the amount of hydraulic oil in the hydraulic pump 30, which is the object of the operation control. By adjusting the amount of hydraulic oil, the rotation speed of the drive shaft is controlled, and the traveling speed of the work vehicle 10 and the vertical movement speed of the arm are controlled. The determination unit 131 determines whether or not the user identification information (passcode) input via the input unit 133 matches the user identification information registered in advance, and if it matches, it is determined that the input user is a registered user. The determination unit 131 also determines whether or not to limit the discharge amount of the hydraulic pump 30 according to the detection results from the rotation speed sensor, the operation lever sensor 27, etc., and outputs the determination result. The passcode is set for each user and is a combination of multiple alphanumeric characters that can be changed, but the number of digits is not limited to multiple, and the alphanumeric characters may include uppercase and lowercase letters, for example. The user may be identified by an authentication method other than the passcode, such as fingerprint authentication, voice authentication, or face authentication.

[0025] The input unit 133 receives input of user identification information, user registration information (name, attributes, etc.), and user work history information including setting information for each mechanism (travel lever sensitivity setting, attachment lever sensitivity setting, etc.) via the touch panel of the display unit 60, and also receives detection results from the rotation speed sensor and the operation lever sensor 27, etc. The attribute information is information that identifies whether the user is an administrator (e.g., a person who has the authority to view and change all of the various setting information) or a user (e.g., a person who has the authority to view and change only a part of the various setting information). The output unit 134 outputs control signals (operation control signals, display control signals, etc.) from the control unit 130 to the controlled object (hydraulic pump 30, display unit 60, etc.). The database 24 has a user registration information storage unit 121 that stores user identification information and user registration information used for user authentication described later, and a user history information storage unit 122 that stores user work history information (including the operation setting contents of the work vehicle 10). The registration processing unit 132 registers user identification information, user registration information, and user work history information (including operation setting contents of the work vehicle 10) previously obtained from the user in the database 24, and when updated, updates the user identification information, user registration information, and user work history information (including operation setting contents of the work vehicle 10) already registered in the database 24.

[0026] The display unit 60 is provided in front of the driver's seat inside the cabin 25 of the work vehicle 10, and displays a user authentication acceptance screen, a user work history information screen (including the operational settings of the work vehicle 10), etc. based on a predetermined display control signal from the display control unit 136.

[0027] [User authentication process] The specific manner in which user authentication is performed will be described below with reference to the flowchart in Fig. 5. When the push button 72 (engine start button: see Fig. 6) is pressed briefly (step S101), a passcode authentication screen is displayed on the display unit 60 (step S102). The passcode authentication screen is a screen that prompts the user to enter a passcode of a predetermined number of digits, as shown in Fig. 6. In the example of Fig. 6, a screen that prompts the user to enter a passcode is displayed, but to strengthen security, the user may be prompted to enter a passcode after entering a user ID.

[0028] In step S103, when a passcode is input on the display screen of the display unit 60, in step S104, the judgment unit 131 compares the input passcode with the passcode of the registered user stored in the user registration information storage unit 121 of the database 24. If the input passcode matches the passcode registered in advance for the user, the judgment unit 131 judges that the authentication has been successful (step S105), and judges that the input user is a registered user. Next, in step S106, the judgment unit 131 judges whether the push button 72 has been pressed for a predetermined time or longer. If the push button 72 has been pressed for a predetermined time or longer, the second ECU 32 starts the engine 21 in response to the judgment result (step S107). Thereafter, when the push button 72 is pressed for a long time or short time (step S108), the accessory power supply is turned off (step S109), and the process ends.

[0029] Returning to step S104, if the input passcode does not match the passcode registered in advance for that user, the determination unit 131 determines that the authentication has failed (step S112), and the process returns to step S102.

[0030] (Modification) Even if the user does not enter a registered passcode on the passcode entry screen in step S102, if an RFID tag (RFID key in the example of FIG. 6) 71 (see FIG. 6) having different tag information is distributed to each user, this tag information can be used as a passcode for user authentication. An RFID tag detection unit (not shown: reading reader) that reads the tag information of the RFID tag 71 is provided near the engine start button 72 (push button: see FIG. 6). An individual ID (tag user ID) is assigned to the RFID tag 71, and information such as the name and attributes of the user (worker) is registered (stored) in the database 24. The attribute information is information for distinguishing whether the user is an administrator or a user.

[0031] User authentication using the RFID tag 71 will be described below with reference to Fig. 5 and Fig. 6. Specifically, the RFID tag 71 is held over an RFID tag detection unit (not shown: reading reader) (step S110), and the determination unit 131 determines whether the tag information of the held RFID tag 71 matches the registered tag information registered in advance (step S111). If the tag information of the held RFID tag 71 matches the tag information registered in advance of the user, the determination unit 131 determines that the authentication has been successful (step S105), and determines that the input user is a registered user. In step S111, if the input passcode does not match the passcode registered in advance of the user, the determination unit 131 determines that the authentication has failed (step S112), and the process returns to step S102.

[0032] According to the above-mentioned configuration, only operators who have been successfully authenticated can start the engine, improving security and safety. Furthermore, if the user authentication performed from the display unit fails, the display unit functions as an alternative authentication means, so that the user authentication process can be performed more reliably.

[0033] [User work history management] The user registration information storage unit 121 constituting the database 24 stores user registration information (passcode, RFID information) used for the above-mentioned user authentication. The user history information storage unit 122 stores user work history information linked to each user who performed the work. This work history information includes the worker's name, user ID, work date and time, work content (e.g., work time), language setting content described later, operation setting content of each mechanism, etc., and is linked to the user and updated each time work is performed. When the display unit 60 is started, a menu display screen (not shown) is displayed, and when a button (e.g., an icon) of the work history information displayed on the menu display screen is selected, work history information related to the work time of each user 300, for example, as shown in FIG. 9, is displayed. The information shown in FIG. 9 displays the driving start work 310 of the work vehicle and the driving end time 320 of the work vehicle, and when the current work is completed, the work time is added, and the work history information is linked to the user and updated by the registration processing unit 132. In addition to the work time, information (not shown) on the work content and the user's operation settings for each mechanism of the work vehicle (travel lever sensitivity settings, attachment lever sensitivity settings, etc.) are also displayed. Details of the operation settings will be described later. It is possible to place restrictions on the viewed content and the available information in the work history information for the administrator and the user (differentiate the available information). For example, it is possible to allow only the administrator to view the work content in the work history information and register / delete users, but not the user, or to allow only the user to set the operation settings for each mechanism in the work history information. This is just one example, and the operation restrictions (the content that can be operated) can be set so that it is available to either the administrator or the user, or to both.

[0034] In the case where the administrator and the user are restricted (differentiated) in the information available in the viewing contents and work history information, the administrator can, for example, register and delete users, so that the administrator can smoothly manage users. In addition, the work history information such as the work time linked to each user can be viewed on the display unit 60, so that, for example, various operation settings at the time of a certain user's previous use can be known, and the work preferences of the user can be known, so that the efficiency of management of users can be improved. On the other hand, the user can easily understand the past operations (travel lever sensitivity setting, attachment lever sensitivity) that he or she has set, so that, for example, even if the user wants to set the same settings as in the past, the setting can be completed in a short time without having to set them from scratch each time, so that the efficiency of work can be improved.

[0035] [Language settings for characters displayed on the display screen, etc.] When the display unit 60 is started, a menu display screen (not shown) is displayed, and when a button for language setting information displayed on the menu display screen (for example, icon 151 as shown in FIG. 7) is selected, multiple language selection buttons 150 as shown in FIG. 7 are displayed. When the current operation is completed, the information on the language selected this time is linked to the user and updated, and the next time the user starts up the display unit 60, the language of the characters etc. displayed on the display unit will be the language selected last time. This allows foreigners who speak different languages ​​to easily make settings etc.

[0036] [Operation settings for each mechanism of the work vehicle] When the display unit 60 is started up, a menu display screen (not shown) is displayed, and when an operation setting button for each mechanism displayed on the menu display screen (e.g., icon 251 as shown in FIG. 8) is selected, a plurality of operation setting icons 252, 254, 256 and operation setting buttons 200, 210, 220 as shown in FIG. 8 are displayed.

[0037] (Traction lever sensitivity setting 1) The operation setting button 200 is for enabling the travel lever sensitivity of the right and left traveling devices 12 to be set in multiple stages (levels R1 to R10 and levels L1 to L10 in FIG. 8). Increasing the travel lever sensitivity increases the travel speed. In the operation setting button 200 shown in FIG. 8, for example, the left level increases according to the number of times the left level selection button 337L is touched, and the right level increases according to the number of times the right level selection button 337R is touched. When the setting is completed, the set travel lever sensitivity is linked to the user information set by the registration processing unit 132 and stored in the database 24.

[0038] (Traction lever sensitivity setting 2) The travel lever sensitivity setting button (operation setting button) 220 allows the travel lever sensitivity of the work vehicle 10 to be set, for example, in three stages (low sensitivity, medium sensitivity, normal sensitivity). Note that the stages are not limited to three stages. The user presses the travel lever sensitivity setting button 220 to select a desired level (stage) according to his / her skill or the type of work. In the travel lever sensitivity setting button 220 shown in FIG. 8, for example, the travel lever sensitivity is selected such that the level of the travel lever sensitivity decreases according to the number of times the left level selection button 537L is touched, and the level of the travel lever sensitivity increases according to the number of times the right level selection button 537R is touched. When the setting is completed, the set travel lever sensitivity is linked to the information of the user who set it and stored in the database 24.

[0039] (Attachment lever sensitivity setting) The attachment lever sensitivity setting button (operation setting button) 210 is for setting the attachment lever sensitivity in three stages (L1 to L3). It goes without saying that the stages are not limited to three stages. If the attachment lever sensitivity is increased, the operation speed of the attachment increases. In the operation setting button 210 shown in FIG. 8, for example, when selecting the attachment lever sensitivity speed, the left level increases according to the number of times the left level selection button 437L is touched, and the right level increases according to the number of times the right level selection button 437R is touched. When the setting is completed, the set attachment lever sensitivity is linked to the user information set by the registration processing unit 132 and stored in the database 24.

[0040] (Other Settings) In addition to the above, the on / off setting of the 270-degree camera composed of the 270-degree cameras 50, 52, and 54 can be exemplified.

[0041] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0042] 1...user management system for work vehicle, 10...work vehicle (crawler loader), 11a, 11b...endless track (crawler), 12...running gear, 13...main body frame, 21...engine, 22...first ECU, 23...control unit, 24...database, 25...cabin, 27...operation lever sensor, 30...hydraulic pump, 32...second ECU, 40...hydraulic motor, 60...display unit, 61...operator seat, 71...RFID tag (RFID key), 72...push button (engine start button), 140...left side hydraulic motor, 141...right side hydraulic motor

Claims

1. A user management system for a work vehicle, which performs user management tasks including user authentication based on user information input via a display unit provided in the work vehicle, a control unit which determines whether a user identification ID inputted via the display unit matches a registered user identification ID which has been registered in advance, and if the user identification ID matches the registered user identification ID which has been registered in advance, determines whether an engine start button has been pressed for a predetermined period of time or more, and starts an engine if the engine start button has been pressed for the predetermined period of time or more. A user management system for a work vehicle.

2. a database that stores user information having at least the user identification ID and user work history information including setting information for a mechanism of the work vehicle; a registration processing unit that registers and updates the user identification ID and the user work history information stored in the database in response to an access including an input by a user to the display unit, The registered or updated user identification ID and the user work history information are displayed on the display unit.

2. The work vehicle user management system according to claim 1, wherein the user management system is a user management system for a work vehicle.

3. The users include an administrator and a user, and the administrator and the user have different ranges of access authority to the user information.

3. The work vehicle user management system according to claim 2, wherein the user management system is a user management system for a work vehicle.

4. The control unit distributes a different RFID tag to each user, and determines whether or not a tag user ID assigned to the RFID tag matches a pre-registered tag user ID. If the tag user ID matches the pre-registered tag user ID, the control unit determines whether or not an engine start button has been pressed for a predetermined period of time or longer, and starts an engine if the engine start button has been pressed for the predetermined period of time or longer.

2. The work vehicle user management system according to claim 1, wherein the user management system is a user management system for a work vehicle.

Images