A backhoe loader work mode control system and method having a reverse maneuvering function

Abstract

The application discloses a kind of excavator working mode control system and method with reverse steering function, including control unit, man-machine interface, working mode selection switch, control handle back button, seat position interval detection device, hydraulic pilot valve group and working device electric proportional valve group;Control unit is configured as: the gear signal of working mode selection switch, the position signal of seat position interval detection device and the trigger signal of control handle back button are collected, the logic linkage judgment based on multiple signals, output control instruction to hydraulic pilot valve group and working device electric proportional valve group, realize the switching of excavator working mode and working device action control, simultaneously drive man-machine interface output corresponding working mode state prompt.The application is used for whole vehicle working mode control and switching, improve product safety, use convenience, improve the intelligentization and modularization degree of control system, realize the control and safety protection of loading and excavating working device.

Description

Technical Field

[0001] This invention relates to a working mode control system and method for an excavator loader with reverse operation function, belonging to the field of construction machinery. Background Technology

[0002] A backhoe loader is a multi-functional small construction machine that integrates loading and digging functions. The loading and digging devices are located at the front and rear ends, respectively. The driver's seat can rotate 180°, and the control handle rotates synchronously with the seat to adapt to different working postures. During normal operation, the operator can switch to the corresponding working end by rotating the seat to complete loading and digging tasks separately. However, in special operating scenarios such as limited space or complex working conditions, reverse operation is often required, i.e., operating the digging device from the loading end or the loading device from the digging end.

[0003] Existing equipment lacks a control mechanism for reverse operation modes, which can easily lead to malfunctions of the working devices, posing safety hazards. Furthermore, its ease of operation is poor, making it difficult to meet the safety and efficiency requirements of special working conditions. Therefore, there is an urgent need to design a working mode control system for excavators and loaders to achieve accurate control and protection of the loading and excavating devices, thereby improving equipment operational safety and adaptability to different working conditions. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a working mode control system and method for an excavator loader with reverse operation function, used for controlling and switching the working mode of the entire vehicle, improving product safety and ease of use, enhancing the intelligence and modularity of the control system, and realizing the operation control and safety protection of the loading and excavating working devices.

[0005] To achieve the above objectives, the present invention employs a working mode control system for an excavator loader with reverse operation function, including a control unit, a human-machine interface, a working mode selection switch, buttons on the back of the control handle, a seat position range detection device, a hydraulic pilot valve group, and a working device electro-proportional valve group. The control unit is connected to the human-machine interface, the working mode selection switch, the buttons on the back of the control handle, the seat position range detection device, the hydraulic pilot valve group, and the working device electro-proportional valve group respectively. The control unit is configured to: collect the gear signal of the working mode selection switch, the position signal of the seat position range detection device, and the trigger signal of the button on the back of the control handle; based on the logical linkage judgment of multiple signals, output control commands to the hydraulic pilot valve group and the electro-proportional valve group of the working device to realize the switching of the working mode of the excavator loader and the action control of the working device; and at the same time drive the human-machine interface to output the corresponding working mode status prompt.

[0006] As an improvement, the working mode selection switch is a three-position self-locking switch with three positions: middle position, loading selection position, and digging selection position, serving as the main control trigger component for working mode switching.

[0007] As an improvement, the seat position interval detection device includes a loading end interval detection device and an excavation end interval detection device, which are used to detect whether the seat is in the loading end operation interval and the excavation end operation interval, respectively.

[0008] As an improvement, the buttons on the back of the control handle are self-resetting buttons, including buttons on the back of the left and right handles.

[0009] As an improvement, the hydraulic pilot valve group includes a loading mode hydraulic pilot valve group and a digging mode hydraulic pilot valve group, and the working device electro-proportional valve group includes a loading working device electro-proportional valve group and a digging working device electro-proportional valve group; the control unit enables or disables the loading working device and the digging working device individually by independently controlling the on / off state and output parameters of the corresponding valve groups.

[0010] As an improvement, the working modes include driving working mode, loading working mode, digging working mode, reverse loading operation mode and reverse digging operation mode, and the control unit switches to any of the above working modes based on the collected signal combinations.

[0011] A second aspect of the present invention also provides a method for controlling the working mode of a backhoe loader with reverse operation function, applied to the aforementioned backhoe loader working mode control system with reverse operation function, specifically including the following steps: (1) When the control system is powered on and initialized, the control unit outputs the driving working mode control command by default, and prohibits the loading working device and the excavating working device from operating. (2) The control unit collects the gear signal of the working mode selection switch, the position signal of the seat position range detection device and the trigger signal of the button on the back of the control handle in real time; (3) The control unit performs logical linkage judgment on the collected multi-channel signals and outputs corresponding control commands based on the judgment results: If the gear signal is in the neutral position, maintain the driving working mode and prohibit the operation of the two types of working devices; If the gear signal is the loading selection position and the position signal is that the seat is in the loading end range, switch to the loading working mode to enable the loading working device and prohibit the excavation working device from operating; If the gear signal is the excavation selection position and the position signal is that the seat is in the excavation end range, switch to the excavation working mode to enable the excavation working device and prohibit the loading working device from operating. If the gear signal is the loading selection position, the position signal is that the seat is not in the loading end range, and the button trigger signal on the back of the right handle is valid, switch to the reverse loading operation mode to enable the loading work device and prevent the digging work device from operating. If the gear signal is the digging selection position, the position signal is that the seat is not in the digging end range, and the trigger signal of the button on the back of the left or right handle is valid, switch to the reverse digging operation mode to enable the digging working device and prohibit the loading working device from operating. (4) The control unit synchronously drives the human-machine interface to output the status prompt signal corresponding to the working mode.

[0012] As an improvement, in step (1), if the gear position signal of the working mode selection switch is not in the neutral position when the control system is powered on, the control unit will forcibly output the driving working mode control command until the gear position signal is detected to switch to the neutral position before the mode switching logic of step (3) can be executed.

[0013] As an improvement, in step (4), the status prompt signal includes an icon display signal and an audio prompt signal: a stable bucket icon is displayed in loading mode, and a stable digging bucket icon is displayed in digging mode; in reverse loading / digging operation mode, the corresponding icon is flashed and a buzzer alarm signal is output synchronously.

[0014] As an improvement, the trigger signal of the button on the back of the control handle has functional reusability in different working modes: in driving working mode, loading working mode and digging working mode, the trigger signal corresponds to the power cut-off or differential control function; in reverse loading / digging operation mode, the trigger signal only serves as an enable confirmation signal for the operation of the working device.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This invention achieves two overtaking operation modes, namely reverse loading and reverse digging, through a three-way signal linkage design of a working mode selection switch, seat position range detection, and buttons on the back of the handle. This solves the limitation of traditional backhoe loaders that can only control the working device on the same side at the corresponding working end. When faced with special working conditions such as limited space or tricky working angles, the operator does not need to frequently rotate the seat to adjust the position. The operator can control the digging device at the loading end or the loading device at the digging end, which greatly expands the adaptability of the equipment to working scenarios and improves the working efficiency under complex working conditions.

[0016] (2) The system is based on the control unit and has constructed a triple safety protection mechanism of mode switch master control, seat position judgment and button enable confirmation: On the one hand, the interlock logic of enabling the target device and prohibiting non-target devices is strictly implemented in each working mode to avoid the conflict of loading and excavation device malfunction; on the other hand, the reverse operation mode requires additional triggering of the button on the back of the handle to activate, and with the dual prompts of flashing icon and buzzer alarm on the human machine interface, the current working condition is clearly informed to the operator to prevent accidental start; at the same time, the design of power-on forced default driving mode and non-neutral prohibited mode switching avoids safety hazards from the start-up source and comprehensively protects the safety of operators and equipment.

[0017] (3) This invention optimizes the control process and function reuse design: switching working modes only requires coordination between the mode selection switch and the seat position, without complicated settings; the buttons on the back of the handle realize intelligent reuse of regular functions and reverse enable, retaining commonly used functions such as power cut-off and differential in driving and regular loading / digging modes, and automatically switching to enable buttons in reverse mode, so operators do not need to memorize additional control logic, making it easy to get started. In addition, the human-machine interface distinguishes between regular and reverse modes through stable / blinking icons, intuitively conveying the equipment status, reducing the operator's observation and judgment costs, and reducing the labor intensity of long-term operation.

[0018] (4) The control system adopts a modular architecture. The control unit collects various signals and outputs control commands in a coordinated manner. The hydraulic pilot valve group and the electro-proportional valve group of the working device are independently divided according to function. The signal connection of each component is clear and the functional boundaries are well defined. This not only reduces the complexity of system wiring and the failure rate, but also facilitates later inspection and maintenance. At the same time, the whole system does not require major modifications to the original mechanical structure of the excavator loader. It has strong adaptability and can be quickly integrated into various excavator loaders with seat rotation function, which helps to improve the intelligence level and market competitiveness of the product. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the working mode control system for the excavator loader of the present invention; Figure 2 This is a schematic diagram of the structure of the buttons on the back of the control handle of the present invention; Figure 3 This is a schematic diagram of the working mode selection switch of the present invention; Figure 4 This is the logic table for the control and operation mode of the excavator loader in this invention; Figure 5 This is a flowchart of the excavator loader working mode control method of the present invention; In the diagram: 1. Control unit; 2. Working mode selection switch; 3. Buttons on the back of the left handle; 4. Buttons on the back of the right handle; 5. Loading end section detection device; 6. Excavation end section detection device; 7. Loading mode hydraulic pilot valve group; 8. Excavation mode hydraulic pilot valve group; 9. Loading working device electro-proportional valve group; 10. Excavation working device electro-proportional valve group; 11. Human-machine interface. Detailed Implementation

[0020] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0023] like Figures 1-4 As shown, a working mode control system for an excavator loader with reverse operation function includes a control unit 1, a human-machine interface 11, a working mode selection switch 2, buttons on the back of the control handle, a seat position range detection device, a hydraulic pilot valve group, and an electro-proportional valve group for the working device. The control unit 1, as the core computing module of the working mode control system, establishes signal transmission connections with the human-machine interface 11, the working mode selection switch 2, the buttons on the back of the control handle, the seat position range detection device, the hydraulic pilot valve group, and the working device electro-proportional valve group, respectively. The control unit 1, through its built-in control program, collects in real time the gear signal of the working mode selection switch 2, the position signal of the seat position range detection device, and the trigger signal of the button on the back of the control handle. After performing logical AND operation, linkage judgment, and safety verification on the three input signals, the control unit 1 outputs corresponding electronic control commands to the hydraulic pilot valve group and the working device electro-proportional valve group. Through the electronic control signals, it adjusts the on / off state of the hydraulic oil circuit and the pressure output, thereby realizing the switching of multiple working modes of the excavator loader and the control of the working device's actions. At the same time, the control unit 1 synchronously outputs display drive signals to the human-machine interface 11, controlling the human-machine interface 11 to provide real-time feedback on the current working mode status of the system, forming a fully closed-loop control system of signal acquisition, logic judgment, hydraulic execution, and status feedback.

[0024] In some embodiments, such as Figure 3 As shown, the working mode selection switch 2 adopts a three-position self-locking structure switch, specifically with three working positions: middle position, loading selection position, and digging selection position. The middle position is the system safety standby position, while the loading and excavation selection positions are the corresponding operation mode activation positions. As the main control trigger component for switching operation modes, the switch has a self-locking structure that can lock the current position status, preventing gear shift or mode switching caused by equipment vibration or accidental touch by personnel, and ensuring the stability and reliability of the gear signal output.

[0025] In some embodiments, such as Figure 1 As shown, the seat position interval detection device adopts a dual detection structure, specifically including a loading end interval detection device 5 and an excavation end interval detection device 6; The loading end section detection device 5 is used to detect in real time whether the seat has rotated to the loading operation area facing the operation zone, and the digging end section detection device 6 is used to detect in real time whether the seat has rotated to the digging operation area facing the operation zone. Through independent zone detection by the dual detection devices, the current operating orientation of the seat can be accurately determined, providing a reliable position determination basis for the system to distinguish between the conventional forward operation mode and the special reverse overtaking operation mode, and ensuring the accuracy of the mode switching logic from the hardware level.

[0026] In some embodiments, such as Figure 2 As shown, the buttons on the back of the control handle are self-resetting function buttons, specifically including button 3 on the back of the left handle and button 4 on the back of the right handle. The self-resetting structure allows the buttons to automatically spring back and reset after being pressed, effectively avoiding control failures caused by button jamming and continuous signal triggering. The dual-button structure with symmetrical arrangement on the left and right hands can adapt to different operating habits and differentiated enable triggering requirements in the reverse operation mode, providing hardware support for the safe activation of the reverse operation mode.

[0027] In some embodiments, such as Figure 1 As shown, the hydraulic pilot valve group adopts an independent functional partition design, including a loading mode hydraulic pilot valve group 7 and an excavation mode hydraulic pilot valve group 8; The electro-proportional valve group of the working device also adopts a split-type independent control structure, including the electro-proportional valve group 9 of the loading working device and the electro-proportional valve group 10 of the excavating working device. The control unit 1 outputs independent electrical control signals to control the oil circuit on / off, valve core opening, and pressure output parameters of the corresponding valve groups for loading and digging, respectively, so as to enable or forcibly prohibit the operation of the loading and digging working devices. Through the independent valve control architecture of the dual working devices, the oil circuit interference and malfunction conflict of loading and digging actions are completely avoided, and the control accuracy and operation safety of the hydraulic actuator are improved.

[0028] In some embodiments, the control system is adapted to five different working modes, specifically including driving working mode, loading working mode, digging working mode, reverse loading operation mode and reverse digging operation mode. The control unit 1 automatically matches and switches to the corresponding working mode based on different combinations of the working mode selection switch 2 position signal, the seat position range detection device position signal, and the button trigger signal on the back of the control handle. The five working modes fully cover the needs of all scenarios, including equipment driving and transfer, conventional forward loading / excavation operations, and reverse overtaking operations under special working conditions. Through multi-channel signal linkage, automatic switching is achieved without the need for complex manual settings, which greatly improves the adaptability of the equipment to working conditions and the ease of operation. Example

[0029] A method for controlling the working mode of an excavator loader with reverse operation function, such as Figure 4 , Figure 5 As shown, the working mode control system applied to the aforementioned excavator loader with reverse operation function achieves adaptation between normal operation and reverse operation through a closed-loop control process of power-on safety initialization, real-time acquisition of multiple signals, precise judgment through logical linkage, mode switching and execution, and status feedback. Specifically, it includes the following steps: (1) Power-on safety initialization of the control system When the excavator loader is started and the control system is powered on, the control unit 1 executes the initialization program to perform a self-check on its own computing module, the signal interfaces of each component, and the initial state of the hydraulic valve group to ensure that there are no potential faults in the system. After the self-check is passed, the control unit 1 outputs the driving working mode control command by default. By cutting off the oil circuit conduction signal of the loading mode hydraulic pilot valve group 7 and the digging mode hydraulic pilot valve group 8, as well as the drive signal of the loading working device electro-proportional valve group 9 and the digging working device electro-proportional valve group 10, any movement of the loading working device and the digging working device is forcibly prohibited, thus avoiding the risk of misoperation from the source of startup and ensuring the safety of the equipment startup phase. (2) Real-time synchronous acquisition of multiple signals After initialization, control unit 1 enters continuous working state, acquiring three types of core signals in real time and synchronously through preset signal acquisition ports: First, the position signal (neutral, loading, excavation) of the working mode selection switch 2 is used to obtain the operator's intention to select the mode; Second, the position signals of the seat position interval detection device, namely the "whether the seat is in the loading end operation interval" signal output by the loading end interval detection device 5 and the "whether the seat is in the digging end operation interval" signal output by the digging end interval detection device 6, clearly define the current operation position reference. Third, the trigger signals of the buttons on the back of the control panel, including the "press-triggered / not triggered" status signals of button 3 on the back of the left control panel and button 4 on the back of the right control panel, capture the function trigger commands of the operator; (3) Multi-channel signal logic linkage judgment and mode switching control The control unit 1 has a built-in preset logic linkage algorithm that performs comprehensive calculations, priority determination, and safety verification on the three types of signals collected. Based on different signal combinations, it outputs corresponding control commands to achieve precise switching between five working modes. The specific determination logic is as follows: If the acquired gear position signal is in the neutral position (no intention to select a working mode), the control unit 1 maintains the driving working mode control command unchanged, continuously cuts off the drive signals of the loading and digging working devices, prohibits their operation, and ensures that the working devices do not intervene during the equipment's operation. If the acquired gear signal is the loading selection position, and the position signal indicates that the seat is within the detection range of the loading end section detection device 5 (the operator is operating in the forward direction at the loading end), the control unit 1 immediately switches to the loading working mode: it outputs an enable signal to the loading mode hydraulic pilot valve group 7 and the loading working device electro-proportional valve group 9, allowing them to adjust the oil circuit parameters according to subsequent operation commands and drive the loading working device to move; at the same time, it outputs a prohibition signal to the digging mode hydraulic pilot valve group 8 and the digging working device electro-proportional valve group 10, locking the digging working device to prevent erroneous operation across devices; If the acquired gear signal is the excavation selection position, and the position signal indicates that the seat is within the detection range of the excavation end section detection device 6 (the operator is operating in the forward direction at the excavation end), the control unit 1 immediately switches to the excavation working mode: it outputs an enable signal to the excavation mode hydraulic pilot valve group 8 and the excavation working device electro-proportional valve group 10, allowing the excavation working device to respond to the operation command; at the same time, it outputs a prohibition signal to the loading mode hydraulic pilot valve group 7 and the loading working device electro-proportional valve group 9, prohibiting the loading working device from operating, ensuring the operator's focus. If the acquired gear signal is the loading selection position, and the position signal indicates that the seat is not within the detection range of the loading end interval detection device 5 (the operator is at the non-loading end and needs to operate the loading device in reverse), and at the same time the trigger signal of the button 4 on the back of the right handle is detected to be valid (e.g., press and hold for at least 0.5 seconds to avoid accidental touch), the control unit 1 switches to the reverse loading operation mode: outputs an enable signal to the loading mode hydraulic pilot valve group 7 and the loading working device electro-proportional valve group 9 to enable the loading working device; continuously outputs a prohibition signal to the excavation-related valve group to prohibit the excavation working device from operating, thereby realizing the reverse control of the loading device from the non-loading end; If the acquired gear position signal is the excavation selection position, and the position signal indicates that the seat is not within the detection range of the excavation end section detection device 6 (the operator is at the non-excavation end and needs to operate the excavation device in reverse), and at the same time the trigger signal of the left handle back button 3 or the right handle back button 4 is detected to be valid (either button is pressed for at least 0.5 seconds), the control unit 1 switches to the reverse excavation operation mode: outputs an enable signal to the excavation mode hydraulic pilot valve group 8 and the excavation working device electro-proportional valve group 10 to enable the excavation working device; continuously prohibits the operation of the loading working device, adapting to the reverse control requirements of the excavation device at the non-excavation end.

[0030] (4) Real-time feedback of working mode status While outputting mode switching control commands, the control unit 1 simultaneously generates corresponding status prompt signals, driving the human-machine interface 11 to perform feedback actions, ensuring that operators can keep track of the system's working status in real time, forming a "control-feedback" closed loop, and improving operational safety and convenience.

[0031] In some embodiments, a safety verification logic is set in the power-on initialization process of step (1): if the control system detects that the gear signal of the working mode selection switch 2 is not in the middle position when it is powered on, the control unit 1 forcibly maintains the output of the driving working mode control command and locks the working device in the prohibited state; until the control unit 1 detects that the gear signal of the working mode selection switch 2 has switched to the middle position, the mode switching restriction is lifted, and the signal judgment and mode switching logic of step (3) can be executed.

[0032] In some embodiments, in step (4), the status prompt signals output by the human-machine interface 11 include two types: visual icon display signals and auditory sound prompt signals. When in loading mode, the HMI 11 displays a stable bucket icon; when in digging mode, the HMI 11 displays a stable digging bucket icon. When in reverse loading or reverse digging operation mode, the human-machine interface 11 will flash the bucket icon or digging bucket icon and simultaneously output a buzzer alarm signal to clearly distinguish between the normal operation mode and the reverse operation mode.

[0033] In some embodiments, the left handle rear button 3 and the right handle rear button 4 have mode-adaptive function reuse characteristics: In driving mode, loading mode and digging mode, the trigger signals of button 3 on the back of the left handle and button 4 on the back of the right handle will execute the power cut-off control function or the differential control function respectively. In reverse loading and reverse digging operation modes, the trigger signals of button 3 on the back of the left handle and button 4 on the back of the right handle serve only as enable confirmation signals for the operation of the working device. Switching to dedicated functions ensures the safety of reverse operation.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A working mode control system for an excavator loader with reverse operation function, characterized in that, It includes a control unit, a human-machine interface, a working mode selection switch, buttons on the back of the control handle, a seat position range detection device, a hydraulic pilot valve assembly, and an electro-proportional valve assembly for the working device. The control unit is connected to the human-machine interface, the working mode selection switch, the buttons on the back of the control handle, the seat position range detection device, the hydraulic pilot valve group, and the working device electro-proportional valve group respectively. The control unit is configured to: collect the gear signal of the working mode selection switch, the position signal of the seat position range detection device, and the trigger signal of the button on the back of the control handle; based on the logical linkage judgment of multiple signals, output control commands to the hydraulic pilot valve group and the electro-proportional valve group of the working device to realize the switching of the working mode of the excavator loader and the action control of the working device; and at the same time drive the human-machine interface to output the corresponding working mode status prompt.

2. The excavator loader working mode control system with reverse operation function according to claim 1, characterized in that, The working mode selection switch is a three-position self-locking switch with three positions: middle position, loading selection position, and digging selection position, serving as the main control trigger component for switching working modes.

3. The excavator loader working mode control system with reverse operation function according to claim 1, characterized in that, The seat position interval detection device includes a loading end interval detection device and an excavation end interval detection device, which are used to detect whether the seat is in the loading end operation interval and the excavation end operation interval, respectively.

4. The excavator loader working mode control system with reverse operation function according to claim 1, characterized in that, The buttons on the back of the control handle are self-resetting buttons, including the buttons on the back of the left and right handles.

5. A working mode control system for an excavator loader with reverse operation function according to claim 1, characterized in that, The hydraulic pilot valve group includes a loading mode hydraulic pilot valve group and a digging mode hydraulic pilot valve group. The working device electro-proportional valve group includes a loading working device electro-proportional valve group and a digging working device electro-proportional valve group. The control unit enables or disables the loading working device and the digging working device by independently controlling the on / off state and output parameters of the corresponding valve groups.

6. A working mode control system for an excavator loader with reverse operation function according to claim 1, characterized in that, The operating modes include driving operating mode, loading operating mode, digging operating mode, reverse loading operation mode and reverse digging operation mode. The control unit switches to any of the above operating modes based on the collected signal combinations.

7. A method for controlling the working mode of an excavator loader with reverse operation function, characterized in that, The working mode control system for an excavator loader with reverse operation function as described in any one of claims 1-6 specifically includes the following steps: (1) When the control system is powered on and initialized, the control unit outputs the driving working mode control command by default, and prohibits the loading working device and the excavating working device from operating. (2) The control unit collects the gear signal of the working mode selection switch, the position signal of the seat position range detection device and the trigger signal of the button on the back of the control handle in real time; (3) The control unit performs logical linkage judgment on the collected multi-channel signals and outputs corresponding control commands based on the judgment results: If the gear signal is in the neutral position, maintain the driving working mode and prohibit the operation of the two types of working devices; If the gear signal is the loading selection position and the position signal is that the seat is in the loading end range, switch to the loading working mode to enable the loading working device and prohibit the excavation working device from operating; If the gear signal is the excavation selection position and the position signal is that the seat is in the excavation end range, switch to the excavation working mode to enable the excavation working device and prohibit the loading working device from operating. If the gear signal is the loading selection position, the position signal is that the seat is not in the loading end range, and the button trigger signal on the back of the right handle is valid, switch to the reverse loading operation mode to enable the loading work device and prevent the digging work device from operating. If the gear signal is the digging selection position, the position signal is that the seat is not in the digging end range, and the trigger signal of the button on the back of the left or right handle is valid, switch to the reverse digging operation mode to enable the digging working device and prohibit the loading working device from operating. (4) The control unit synchronously drives the human-machine interface to output the status prompt signal corresponding to the working mode.

8. A method for controlling the working mode of an excavator loader with reverse operation function according to claim 7, characterized in that, In step (1), if the gear position signal of the working mode selection switch is not in the neutral position when the control system is powered on, the control unit will forcibly output the driving working mode control command until the gear position signal is detected to switch to the neutral position before the mode switching logic of step (3) can be executed.

9. A method for controlling the working mode of an excavator loader with reverse operation function according to claim 7, characterized in that, In step (4), the status prompt signal includes an icon display signal and an audio prompt signal: a stable bucket icon is displayed in loading mode, and a stable digging bucket icon is displayed in digging mode; in reverse loading / digging operation mode, the corresponding icon is flashed and a buzzer alarm signal is output synchronously.

10. A method for controlling the working mode of an excavator loader with reverse operation function according to claim 7, characterized in that, The trigger signal of the button on the back of the control handle has functional reusability in different working modes: in driving working mode, loading working mode and digging working mode, the trigger signal corresponds to the power cut-off or differential control function; in reverse loading / digging operation mode, the trigger signal only serves as an enable confirmation signal for the operation of the working device.

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