Underground shovel and gear control system and method

Abstract

The application discloses an underground scraper and a gear control system and method thereof, wherein the gear control system comprises a gear shifting handle for being operated by a user to realize a gear shifting operation; a gear shifting electromagnetic valve for realizing the conduction or closing of an oil path of the gear shifting according to an input electric signal; the gear control system further comprises a control device for sending a control signal to the gear shifting electromagnetic valve according to a control signal sent by the gear shifting handle to realize the control of the gear shifting electromagnetic valve; wherein the gear shifting handle comprises a forward gear shifting button for being operated by the user to make the gear shifting handle send a forward gear shifting signal to the control device; and a backward gear shifting button for being operated by the user to make the gear shifting handle send a backward gear shifting signal to the control device. The application has the beneficial effect of providing a gear control system and method of an underground scraper, which is flexible in gear shifting and convenient for gear limiting.

Description

Technical Field

[0001] This application relates to the field of engineering vehicle technology, and more specifically, to an underground loader and its gear control system and method. Background Technology

[0002] Underground loaders are bidirectional transportation equipment in underground mine tunnels. In related technologies, the gear control of underground loaders is a mechanical joystick. If the gears of underground loaders need to be limited for driving safety, it is often necessary to install hardware limit devices.

[0003] In other related technologies, such as Chinese patent CN112324903B, a solution for implementing gear restriction through software is provided. However, this solution is not entirely applicable to the gear devices of existing underground loader machines. Summary of the Invention

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide a gear control system, including: a gear shift lever for user operation to perform gear shifting; a gear shift solenoid valve for opening or closing the oil circuit for gear shifting based on an input electrical signal; the gear control system further includes a control device for sending a control signal to the gear shift solenoid valve based on a control signal sent by the gear shift lever to control the gear shift solenoid valve; wherein the gear shift lever includes a forward gear shift button for user operation to send a forward gear shift signal to the control device; and a reverse gear shift button for user operation to send a reverse gear shift signal to the control device.

[0006] Furthermore, the gear control system also includes a directional solenoid valve, which is used to open or close the oil circuit for directional control based on the input control signal; wherein, the control device sends a control signal to the directional solenoid valve based on the forward shift signal or the reverse shift signal.

[0007] Furthermore, the gear control system also includes a throttle device for user operation to achieve throttle control; wherein, the control device sends a control signal to the directional solenoid valve based on the control signal sent by the throttle device.

[0008] Furthermore, the gear control system also includes an interactive device for user operation to achieve human-machine interaction; wherein, the control device sends a control signal to the directional solenoid valve according to the control signal sent by the interactive device.

[0009] Furthermore, the interactive device includes a first interactive module for user operation to select between automatic and manual transmission modes. The control device sends control signals to the directional solenoid valve based on control signals sent by the first interactive module.

[0010] Furthermore, the interactive device also includes a second interactive module for user operation to achieve gear limiting in manual mode; wherein, the control device sends a control signal to the directional solenoid valve according to the control signal sent by the second interactive module.

[0011] Furthermore, the control device includes a main controller, which is electrically connected to the gear shift lever, the first interaction module, and / or the second interaction module to receive their control signals.

[0012] Furthermore, the control unit also includes an engine controller, which is electrically connected to the accelerator pedal to receive its control signals.

[0013] Furthermore, the control unit also includes a transmission controller, which is electrically connected to the directional solenoid valve and / or the shift solenoid valve to send control signals to them.

[0014] Furthermore, the transmission controller is electrically connected to the main controller and the generator controller respectively, so that the main controller: responds to the control signal sent by the gear shift lever, knows the target gear corresponding to the control signal; determines whether the target gear corresponding to the control signal is the maximum gear or the minimum gear in the gear position limit of the second interaction module; if so, sends a control signal to the transmission controller to switch to the target gear; otherwise, sends a control signal to the transmission controller to switch to the maximum gear or the minimum gear.

[0015] As a first aspect of this application, some embodiments of this application provide a gear control method applicable to the above-mentioned underground shovel loader, including: responding to a control signal sent by a gear shift lever, knowing the target gear corresponding to the control signal; determining whether the target gear corresponding to the control signal is the maximum gear or the minimum gear in the gear limit of the second interaction module; if so, sending a control signal to the gearbox controller to switch to the target gear; otherwise, sending a control signal to the gearbox controller to switch to the maximum gear or the minimum gear.

[0016] As a second aspect of this application, some embodiments of this application provide an underground loader that includes the gear control system described above.

[0017] The beneficial effects of this application are: it provides an underground loader and its gear control system and method that allow for flexible gear switching and easy gear restriction.

[0018] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0019] The interactive device includes a first interactive module that allows users to select between automatic and manual modes, increasing the diversity of user choices and enabling quick and convenient switching of the underground loader's operating status.

[0020] The interactive device includes a second interactive module for user operation to achieve gear limitation in the manual transmission mode. This allows for the limitation of the maximum gear without modifying the transmission, thus meeting the needs of different users. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0022] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the physical structure of an underground loader according to an embodiment of this application;

[0025] Figure 2 This is a schematic block diagram of a portion of the module architecture of the gear control system in an underground loader according to an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the main steps of a gear control method according to an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of a gear shifting method in manual mode according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of a gear shifting method in an automatic transmission state according to an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the gear control method steps according to an embodiment of this application.

[0030] Meaning of the reference numerals in the diagram:

[0031] 100. Gear shift lever; 110. Forward gear shift button; 120. Reverse gear shift button;

[0032] 200. Variable speed solenoid valve;

[0033] 300. Control device; 310. Main controller; 320. Engine controller; 330. Transmission controller;

[0034] 400. Directional solenoid valve;

[0035] 500. Throttle mechanism;

[0036] 600, Interactive device; 610, First interactive module; 620, Second interactive module.

[0037] 700. Underground loader; 710. Bucket; 720. Vehicle body; 730. Cab; 740. Wheels. Detailed Implementation

[0038] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0039] It should also be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0040] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] like Figure 1 As shown, the underground loader 700 of this application includes: a bucket 710, a body 720, a cab 740, and wheels 750.

[0042] The loader 700 comprises a bucket 710 for loading materials such as rocks, a chassis 720 for mounting the engine and other equipment, and a cab 740 located on one side of the loader 700. The cab 740 provides space for the user and corresponding operating devices. Due to the working environment of the underground loader 700, its cab 740 is relatively low compared to general loaders, and it is difficult to observe the situation on the other side. Therefore, it is essential to design a flexible gear control system for the underground loader 700 to allow the user to quickly switch gears to ensure driving safety. It is also necessary to restrict gears in certain work environments to avoid driving risks.

[0043] Specifically, Figure 2As shown, the underground loader 700 of this application includes a gear control system, which includes: a gear shift handle 100, a gear shift solenoid valve 200, a control device 300, a directional solenoid valve 400, a throttle device 500, and an interaction device 600.

[0044] The gear shift lever 100 is used by the user to perform gear shifting operations, and the gear shift solenoid valve 200 is used to open or close the oil circuit for gear shifting according to the input electrical signal.

[0045] Specifically, the gear shift lever 100 includes a forward gear shift button 110 and a reverse gear shift button 120. The forward gear shift button 110 is operated by the user to send a forward gear shift signal to the control device 300; the reverse gear shift button 120 is operated by the user to send a reverse gear shift signal to the control device 300.

[0046] More specifically, the gear shift lever 100 is located in a position easily accessible to the operator in the cab. When the user needs to change the gear of the underground loader 700, the gear of the underground loader 700 can be directly changed by operating the gear shift lever 100.

[0047] The shift solenoid valve 200 opens and closes the gear shifting oil circuit according to the input electrical signal. When the gear shifting oil circuit is open or closed, a gear shifting operation is performed; when the shifting oil circuit is closed, a gear shifting operation is not performed. The control device 300 is used to send control signals to the shift solenoid valve 200 according to the control signals sent by the shift lever 100 to control the shift solenoid valve 200.

[0048] More specifically, the control device 300 receives the shift control signal from the shift lever 100, and then sends a control signal to the shift solenoid valve 200 according to the shift control signal to control the shift solenoid valve 200, thereby controlling the opening or closing of the shift solenoid valve 200's gear switching oil circuit.

[0049] Specifically, pressing the forward shift button 110 sends a forward shift signal to the shift lever 100, and pressing the reverse shift button 120 sends a reverse shift signal to the shift lever 100. The shift lever 100 then generates a control signal based on the forward or reverse shift signal and sends it to the control device 300. In another similar embodiment, the shift lever 100 directly sends a forward or reverse shift signal to the control device 300, which then generates a control signal based on the forward or reverse shift signal and sends it to the shift solenoid valve 200 to open and close the oil circuit for gear shifting. When the shift solenoid valve 200 receives a forward shift signal, it opens the shift oil circuit, and the transmission controller 330 controls the shift solenoid valve 200 in the transmission to shift up one gear from the current gear. When the shift solenoid valve 200 receives a reverse shift signal, it opens the shift oil circuit, and the transmission controller 330 controls the shift solenoid valve 200 in the transmission to shift down one gear from the current gear.

[0050] The directional solenoid valve 400 is used to open or close the oil circuit for directional control according to the input control signal; the control device 300 sends a control signal to the directional solenoid valve 400 according to the forward shift signal or the reverse shift signal.

[0051] Specifically, the underground loader 700 includes three operating states: forward, reverse and neutral. The control device 300 sends a control signal to the directional solenoid valve 400 according to the forward shift signal or the reverse shift signal.

[0052] When the underground loader 700 is in neutral, the directional solenoid valve 400 receives a forward gear shift signal from the control device 300 and switches the underground loader 700 from neutral to forward.

[0053] When the underground loader 700 is in neutral, the directional solenoid valve 400 receives a reverse gear shift signal from the control device 300 and switches the underground loader 700 from neutral to reverse.

[0054] When the underground loader 700 is in the forward state, the directional solenoid valve 400 will maintain the underground loader 700 in the forward state when it receives the forward gear shift signal sent by the control device 300.

[0055] When the underground loader 700 is in the forward position, when the directional solenoid valve 400 receives the reverse gear shift signal sent by the control device 300, if the number of gears of the underground loader 700 is greater than one, then the number of gears is reduced by one. If the number of gears of the underground loader 700 is equal to one, then the directional solenoid valve 400 switches the underground loader 700 from the forward position to the neutral position.

[0056] When the underground loader 700 is in the reverse state, the directional solenoid valve 400 will maintain the underground loader 700 in the reverse state when it receives the forward gear shift signal sent by the control device 300.

[0057] When the underground loader 700 is in reverse, when the directional solenoid valve 400 receives the reverse gear shift signal sent by the control device 300, if the number of gears of the underground loader 700 is greater than one, then the number of gears is reduced by one. If the number of gears of the underground loader 700 is equal to one, then the directional solenoid valve 400 switches the underground loader 700 from the reverse state to the neutral state.

[0058] The traditional steering lever and gear shift lever are integrated into a single gear shift lever 100. By controlling this single lever 100, the gear and direction of the underground loader 700 can be controlled, reducing operational difficulty and optimizing the cab space. In particular, it improves operational flexibility, allowing for more flexible gear and direction switching when the user needs to perform emergency operations. This enables the underground loader 700 to be in the appropriate gear to assist the user in deceleration and steering, and to some extent compensates for the limited visibility caused by the cab 730 of the underground loader 700.

[0059] Specifically, the interactive device 600 is operated by the user to achieve human-computer interaction. The control device 300 sends control signals to the directional solenoid valve 400 based on the control signals sent by the interactive device 600.

[0060] The interactive device 600 primarily provides a human-machine interface for users to set data and also provides feedback to the user on various data received by the control device 300. As a specific solution, the interactive device 600 can employ a touchscreen display with a processing chip and memory. The touchscreen can be used to display data and allow users to input data via touch. Users can achieve human-machine interaction by operating commands on the touchscreen from inside the driver's cab. Using a touchscreen as the carrier of the interactive module improves the intelligence of human-vehicle interaction and reduces operational difficulty.

[0061] More specifically, the interactive device 600 includes: a first interactive module 610 and a second interactive module 620.

[0062] The first interaction module 610 is used by the user to select between automatic and manual transmission modes. The control device 300 sends control signals to the directional solenoid valve 400 based on the control signals sent by the first interaction module 610.

[0063] Specifically, the first interaction module 610 includes automatic and manual modes. The operator can send switching commands to the first interaction module 610 to switch the underground loader 700 between automatic and manual modes. When the user sends a manual control signal to the control device 300 through the first interaction module 610, the underground loader 700 is in manual mode. The user then sends a control signal to the control device 300 by operating the gear shift lever 100. The control device 300 then sends a control signal to the gear shift solenoid valve 200 to control the gear shift solenoid valve 200. Simultaneously, the control device 300 also sends a control signal to the direction solenoid valve 400 to achieve directional control of the underground loader 700.

[0064] More specifically, when the user sends an automatic gear control signal to the control device 300 through the first interaction module 610, the underground loader 700 is in automatic gear mode. Since the gear control system also includes a throttle device 500 for the user to operate to achieve throttle control operation, the control device 300 sends a control signal to the directional solenoid valve 400 according to the control signal sent by the throttle device 500. At this time, the gear shift lever 100 only controls the three operating states of the underground shovel loader 700: forward, reverse, and neutral. The underground shovel loader 700 is in neutral by default when parked. When the control device 300 receives the forward gear shift signal from the control lever, i.e., when the user presses the forward gear shift button 110, the underground shovel loader 700 changes to the forward state. At this time, the throttle device 500 sends a throttle signal to the control device 300, which includes the opening degree of the throttle valve. The control device 300 then sends a forward signal to the directional solenoid valve 400, and the underground shovel loader 700 moves forward. As the opening degree of the throttle valve increases, the forward speed of the underground shovel loader 700 increases accordingly. The control device 300 controls the gearbox to match the corresponding forward gear according to the throttle signal.

[0065] When the control device 300 receives a reverse gear shift signal from the control handle, i.e., when the user presses the reverse gear shift button 120, the underground loader 700 enters reverse mode. At this time, the throttle device 500 sends a throttle signal to the control device 300, which in turn sends a reverse signal to the directional solenoid valve 400, causing the underground loader 700 to reverse. As the throttle valve opening increases, the reverse speed of the underground loader 700 increases accordingly. The control device 300 controls the gearbox to match the appropriate reverse gear based on the throttle signal.

[0066] Specifically, the second interaction module 620 is used for user operation to achieve gear limiting in manual mode; the control device 300 sends a control signal to the directional solenoid valve 400 according to the control signal sent by the second interaction module 620.

[0067] Specifically, gear limit refers to limiting the maximum gear that can be reached. Specifically, when the maximum gear is limited to third gear, the maximum gear of the underground loader 700 in forward mode is third gear. When the underground loader 700 is in third gear, when the forward gear shift button 110 of the gear shift lever 100 is operated, the control device 300 sends a gear increase signal to the gear shift solenoid valve 200. The gear shift solenoid valve 200 will not control the opening and closing of the gear control oil circuit to increase the gear, but will keep the underground loader 700 in third gear. When the user operates the underground loader 700 to downshift, the gear can be smoothly reduced. Similarly, in reverse mode, the maximum gear of the underground loader 700 is third gear. When the underground loader 700 is in third gear, and the reverse gear shift button 120 of the gear shift lever 100 is operated, the control device 300 sends a gear increase signal to the gear shift solenoid valve 200. The gear shift solenoid valve 200 will not control the gear control oil circuit to increase the gear; instead, it will keep the underground loader 700 in third gear. When the user operates the underground loader 700 to downshift, the gear will smoothly decrease. The maximum gear limit referred to here can be fourth, third, second, and first gear in forward mode, and fourth, third, second, and first gear in reverse mode.

[0068] More specifically, the second interaction module 620 is used by the user to control the gear selection in automatic transmission mode. When the maximum gear is currently selected, the gearbox will send the gear selection signal to the control device 300 based on the throttle signal. The control device 300 will then send a control signal to the electronic shift solenoid valve to automatically switch the gear between first gear and the maximum gear.

[0069] Specifically, the control device 300 includes a main controller 310, an engine controller 320, and a transmission controller 330. The main controller 310 is electrically connected to the gear shift lever 100, the first interaction module 610, and / or the second interaction module 620 to receive their control signals. The engine controller 320 is electrically connected to the accelerator pedal to receive its control signals. The transmission controller 330 is electrically connected to the steering solenoid valve 400 and / or the gear shift solenoid valve 200 to send control signals to them.

[0070] The transmission controller 330 is electrically connected to the main controller and the generator controller, respectively, so that the main controller 310: responds to the control signal sent by the gear shift lever 100, knows the target gear corresponding to the control signal; determines whether the target gear corresponding to the control signal is the maximum gear or the minimum gear in the gear limit of the second interaction module 620; if so, sends a control signal to the transmission controller 330 to switch to the target gear; otherwise, sends a control signal to the transmission controller 330 to switch to the maximum gear or the minimum gear.

[0071] The control system can limit the gear according to user needs. After limiting the gear of the underground loader 700, the highest gear of the underground loader 700 is limited, and the maximum speed it can reach is limited, thereby meeting the needs of different working conditions.

[0072] like Figure 3 As shown, based on the underground loader 700 and its gear control system described above, the gear control method of this application mainly includes the following steps:

[0073] S101: In response to the control signal sent by the gear shift lever, the target gear corresponding to the control signal is known.

[0074] S102: Determine whether the target gear corresponding to the control signal is the maximum or minimum gear in the gear limit of the second interaction module.

[0075] S103: If yes, send a control signal to the transmission controller to switch to the target gear;

[0076] S104: Otherwise, send a control signal to the transmission controller to switch to the maximum or minimum gear.

[0077] Specifically, the main controller 310 first continuously monitors whether there are any gear restriction requirements from the second interaction module 620. Once a gear restriction requirement is received, it will simultaneously limit the maximum gear of both manual and automatic transmissions. The main controller 310 also continuously monitors whether there are control signals from the first interaction module 610 to switch gears, determining whether the transmission is operating in automatic or manual mode.

[0078] like Figures 4 to 6As shown, when the transmission is running in automatic mode, the underground loader 700 is in neutral by default in parking mode. The main controller 310 continuously monitors the shift request control signals sent by the shift lever 100. In neutral, upon receiving a forward signal from the forward shift button, the transmission controller sends a control signal to the direction solenoid valve to switch to the forward direction; upon receiving a reverse shift button signal, the transmission controller sends a control signal to the direction solenoid valve to switch to the reverse direction; upon receiving a neutral signal, it remains in neutral. In forward mode, upon receiving a forward signal from the forward shift button, it remains in forward gear; upon receiving a neutral or reverse shift button signal, it enters neutral. In reverse mode, upon receiving a reverse shift button signal, the transmission remains in reverse gear; upon receiving a neutral or forward signal, the transmission controller sends a control signal to the direction solenoid valve to switch to neutral. At the same time, the main controller 310 monitors the second interaction module 620 to see if there is a need for further gear restrictions in the automatic transmission mode under the currently confirmed maximum gear. Finally, it confirms the maximum gear that the transmission can currently allow. After that, the transmission gear will be automatically switched between 1st gear and the maximum gear by sending the gear to the transmission controller 330 through the engine controller 320 via the throttle device 500.

[0079] When the transmission is in manual mode, the underground loader 700 is in neutral by default when parked. The main controller 310 continuously monitors the gear shift request control signals sent by the gear shift lever 100. In forward gear mode, when a forward signal is received from the forward shift button, if the gear is not at its maximum, it shifts up one gear; if the current gear is the maximum limit, it remains unchanged. When a reverse signal is received from the reverse shift button, it shifts down one gear until it enters neutral. In neutral, when a forward up signal is received from the forward shift button, it shifts to forward gear 1; when a reverse down signal is received from the reverse shift button, it shifts to reverse gear 1. In reverse gear mode, when a forward up signal is received from the forward shift button, it shifts down one gear until it enters neutral; when a reverse down signal is received from the reverse shift button, it shifts up one gear until it reaches the maximum gear.

[0080] As a specific embodiment of the gear control method of this application, when the user sets the maximum gear to 4 gears, the allowed gears of the underground shovel 700 are: forward 1 gear, corresponding to gear=6; forward 2 gear, corresponding to gear=7; forward 3 gear, corresponding to gear=8; forward 4 gear, corresponding to gear=9; neutral, corresponding to gear=5; reverse 1 gear, corresponding to gear=4; reverse 2 gear, corresponding to gear=3; reverse 3 gear, corresponding to gear=2; and reverse 4 gear, corresponding to gear=1.

[0081] When the maximum gear is set to 3, the permissible gears for the underground loader 700 are: Forward 1st gear (gear=6), Forward 2nd gear (gear=7), Forward 3rd gear (gear=8), Neutral (gear=5), Reverse 1st gear (gear=4), Reverse 2nd gear (gear=3), and Reverse 3rd gear (gear=2).

[0082] When the maximum gear is set to 2, the permissible gears for the underground loader 700 are: forward 1st gear (gear=6), forward 2nd gear (gear=7), neutral (gear=5), reverse 1st gear (gear=4), and reverse 2nd gear (gear=3).

[0083] When the maximum gear is set to gear 1, the allowed gears for the underground loader 700 are: forward gear 1 (gear=6), neutral (gear=5), and reverse gear 1 (gear=4).

[0084] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A gear control system, comprising: The gear shift lever is used by the user to switch gears. A gear shift solenoid valve is used to open or close the oil circuit for gear switching based on an input electrical signal. Its features are: The gear control system also includes: A control device is used to send a control signal to the shift solenoid valve according to the control signal sent by the shift lever in order to control the shift solenoid valve. Interactive devices are used by users to achieve human-computer interaction. The control device sends a control signal to the directional solenoid valve based on the control signal sent by the interactive device. The gear shift lever includes: A forward shift button is provided for user operation to send a forward shift signal from the shift lever to the control device. A reverse gear shift button is provided for user operation to send a reverse gear shift signal to the control device via the gear shift lever. The interactive device includes: The first interactive module is used by the user to select between automatic and manual transmission modes. The control device sends a control signal to the directional solenoid valve based on the control signal sent by the first interaction module. The second interactive module is used by the user to operate and realize the gear limitation in the manual mode; The control device sends a control signal to the directional solenoid valve based on the control signal sent by the second interaction module. The control device is also configured to: A directional control signal is sent to the directional solenoid valve according to the forward shift signal or the reverse shift signal; In manual mode, in response to the control signal sent by the gear shift lever, the target gear corresponding to the control signal is determined; Determine whether the target gear corresponding to the control signal is the maximum or minimum gear in the gear limit of the second interaction module; If so, a control signal to switch to the target gear is sent to the gear-shifting solenoid valve; If not, a control signal is sent to the gear shift solenoid valve to switch to the maximum or minimum gear.

2. The gear control system according to claim 1, characterized in that: The gear control system also includes: A directional solenoid valve is used to open or close the hydraulic circuit for directional control based on an input control signal. The control device sends a control signal to the directional solenoid valve based on the forward shift signal or the reverse shift signal.

3. The gear control system according to claim 2, characterized in that: The gear control system also includes: Throttle mechanism, used by the user to perform throttle control operation; The control device sends a control signal to the directional solenoid valve based on the control signal sent by the throttle device.

4. The gear control system according to claim 1, characterized in that: The control device includes: The main controller is electrically connected to the gear shift lever, the first interaction module and / or the second interaction module to receive their control signals.

5. The gear control system according to claim 4, characterized in that: The control device further includes: The engine controller is electrically connected to the accelerator pedal to receive its control signals.

6. The gear control system according to claim 5, characterized in that: The control device further includes: The transmission controller is electrically connected to the directional solenoid valve and / or the shift solenoid valve to send control signals to them.

7. The gear control system according to claim 6, characterized in that: The transmission controller is electrically connected to both the main controller and the engine controller, so that the main controller: In response to the control signal sent by the gear shift lever, the target gear corresponding to the control signal is determined; Determine whether the target gear corresponding to the control signal is the maximum or minimum gear in the gear limit of the second interaction module; if so, send a control signal to the transmission controller to switch to the target gear; otherwise, send a control signal to the transmission controller to switch to the maximum or minimum gear.

8. A method for controlling the gear position of a loader, characterized in that, The loader includes: The gear shift lever is used by the user to switch gears. A gear shift solenoid valve is used to open or close the oil circuit for gear switching based on an input electrical signal. A directional solenoid valve is used to open or close the hydraulic circuit for directional control based on an input control signal. A control device is used to send a control signal to the shift solenoid valve according to the control signal sent by the shift lever in order to control the shift solenoid valve. The first interactive module is used by the user to select between automatic and manual transmission modes. The second interactive module is used by the user to operate and realize the gear limitation in the manual mode; The control device includes: The main controller is electrically connected to the gear shift lever, the first interaction module and / or the second interaction module to receive their control signals; The transmission controller is electrically connected to the directional solenoid valve and / or the shift solenoid valve to send control signals to them; The control method includes: In response to the control signal sent by the gear shift lever, the target gear corresponding to the control signal is determined; Determine whether the target gear corresponding to the control signal is the maximum or minimum gear in the gear limit of the second interaction module; If yes, a control signal to switch to the target gear is sent to the transmission controller; otherwise, a control signal to switch to the maximum or minimum gear is sent to the transmission controller.

9. An underground loader, characterized in that, The gear control system includes any one of claims 1 to 7.

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