A tailgate hydraulic device capable of realizing intelligent control

Abstract

The present invention belongs to the field of fluid transmission and control, and relates to a tailgate hydraulic device capable of intelligent control. The device comprises a hydraulic oil tank, a relief valve, a first solenoid reversing valve, a second solenoid reversing valve, a hydraulically controlled check valve, a door lock cylinder, a tailgate cylinder, a one-way balancing valve, a pressure sensor, a motor pump, a liquid level switch, a microcontroller, and a button box. The present invention utilizes an intelligently controlled tailgate hydraulic device controlled by a microcontroller, enabling one-touch door opening and closing, autonomous determination of the tailgate operating status, and system health status monitoring, reducing operator workload. Fault self-diagnosis and reporting, as well as autonomous entry into a degraded operating mode in the event of sensor failure, improve the reliability of the tailgate hydraulic device's operation and facilitate maintenance.

Description

Technical Field

[0001] The invention belongs to the field of fluid transmission and control, and relates to a tailgate hydraulic device capable of realizing intelligent control. Background Art

[0002] In the prior art, armored vehicle tailgates can be categorized as either side-opening or rocker-type. For vehicles like infantry fighting vehicles and medical vehicles, hydraulically driven rocker-type tailgates are often used. As part of the passageway for soldiers to board and exit the vehicle, these tailgates are heavy and require frequent opening and closing. This often results in the hydraulic drive control device, which is constructed using hardware relays, being prone to malfunction. To ensure the reliability of the tailgate, a manual mechanical locking device is typically installed between the vehicle body and the door after the tailgate is closed. However, this device is complex to open and close; the operator must first unlock the mechanical locking mechanism and then use a button located on the driver's terminal or near the tailgate to open and close the tailgate.

[0003] Although the above solution can basically meet the vehicle's requirements for the tailgate hydraulic device, it has disadvantages such as mechanical manual operation, loose door closure, low level of intelligence, inability to display the tailgate operating status in real time, and inability to communicate with the driver terminal. Summary of the Invention

[0004] (1) Purpose of the present invention

[0005] The purpose of the present invention is to provide a tailgate hydraulic device that is controlled by a microcontroller and can realize one-touch door opening and closing, autonomously determine the tailgate operating status, diagnose and report faults, and autonomously enter a degraded tailgate function operating state, so as to improve the reliability of the tailgate hydraulic device and the convenience of maintenance.

[0006] (2) Solution of the present invention

[0007] A tailgate hydraulic device capable of realizing intelligent control comprises a hydraulic oil tank (1), a relief valve (2), a first electromagnetic reversing valve (3), a second electromagnetic reversing valve (4), a hydraulically controlled one-way valve (5), a door lock oil cylinder (6), a tailgate oil cylinder (7), a one-way balancing valve (8), a pressure sensor (9), a motor pump (10), a liquid level switch (11), a microcontroller (12), and a button box (13); the hydraulically controlled one-way valve (5) is used to lock the door lock oil cylinder circuit to prevent the door lock mechanism from loosening due to vehicle vibration and bumping during vehicle driving; the one-way balancing valve (8) is used as a load holding valve in the tailgate opening circuit to prevent the tailgate from stalling and falling due to the influence of its own weight;

[0008] The oil suction port of the motor pump (10) is connected to the hydraulic oil tank (1) and draws oil from the hydraulic oil tank. The oil outlet of the motor pump (10) is connected to the P port of the overflow valve (2), the electromagnetic reversing valve (1) (3), and the electromagnetic reversing valve (2) (4). The working oil ports A and B of the electromagnetic reversing valve (1) (3) are respectively connected to the working oil ports V1 and V2 of the one-way balance valve (8). The working oil ports C1 and C2 of the one-way balance valve (8) are respectively connected to the rodless cavity and rod cavity oil ports of the tailgate oil cylinder (7) through pipelines. The two tailgate oil cylinders are connected in parallel. The working oil ports A and B of the electromagnetic reversing valve (2) (4) are respectively connected to the V2 and V1 oil ports of the hydraulic control one-way valve (5). The C2 and C1 oil ports of the hydraulic control one-way valve (5) are respectively connected to the rodless cavity and rod cavity oil ports of the door lock oil cylinder (6) through pipelines. The two door lock oil cylinders are connected in parallel. Connection method: The pressure sensor (9) includes a P1 pressure sensor, a P2 pressure sensor, a P3 pressure sensor, and a P4 pressure sensor; the P1 pressure sensor is connected to the B working oil port of the electromagnetic reversing valve (3) to measure the pressure of the door closing action circuit; the P2 pressure sensor is connected to the A working oil port of the electromagnetic reversing valve (3) to measure the pressure of the door opening action circuit; the P3 pressure sensor is connected to the B working oil port of the electromagnetic reversing valve (4) to measure the pressure of the locking action circuit; the P4 pressure sensor is connected to the A working oil port of the electromagnetic reversing valve (4) to measure the pressure of the unlocking action circuit; the T ports of the overflow valve (2), the electromagnetic reversing valve (3), and the electromagnetic reversing valve (4) are connected and merged through a pipeline and then returned to the return oil filter inlet of the hydraulic oil tank (1), thereby forming a complete hydraulic system;

[0009] The microcontroller (12) is connected to the electromagnetic reversing valve 1 (3), the electromagnetic reversing valve 2 (4), and the motor pump (10) through a control cable, and the button box (13) is connected to the microcontroller (12);

[0010] The liquid level switch (11) is installed on the hydraulic oil tank. When the liquid level in the hydraulic oil tank is lower than the alarm value of the liquid level switch (11), the microcontroller (12) reports a low liquid level alarm to the driver terminal and prevents the motor pump (10) from starting.

[0011] Furthermore, a door opening button, a door closing button and a stop button are provided on the button box (13).

[0012] Further, when the door opening button of the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (4) electromagnet Y4 and the motor pump (10) to start the relay first, and the electromagnetic reversing valve (4) A working oil port is connected. The motor pump (10) outputs high-pressure oil and enters the hydraulic control check valve (5) V2 port through the electromagnetic reversing valve (4), and then enters the rodless chamber of the door lock cylinder (6). The piston rod extends to push the door lock to open; when the door lock cylinder (6) runs to the stroke limit, it drives the door lock mechanism to open to the maximum angle. At this time, the pressure in the system will increase instantaneously. The unlocking pressure sensor P4 detects that the circuit pressure rises to the preset value (determined by the overflow pressure of the overflow valve (2)). The microcontroller (12) determines that the unlocking is in place, and the electromagnetic reversing valve (4) electromagnet Y4 loses power; the electromagnetic reversing valve (3) electromagnet Y2 is energized, the electromagnetic reversing valve (3) A working oil port is connected, and the high-pressure oil enters the balance valve V1 port through the reversing valve, and then enters the rodless chamber of the tailgate oil cylinder (7), pushing the tailgate to open; a hydraulically controlled one-way valve is provided at the rod chamber outlet of the tailgate oil cylinder (7) to prevent the pipeline between the tailgate oil cylinder (7) and the one-way balance valve (8) from bursting and causing the tailgate to descend uncontrollably; when the tailgate oil cylinder (7) runs to the stroke limit, it drives the tailgate to open to the maximum angle, at this time the pressure in the system increases, the door opening pressure sensor P2 detects that the pressure rises to the preset value, the microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the starting relay of the motor pump (10) lose power; thereby completing the one-button door opening action.

[0013] Furthermore, the door closing button of the button box (13) is pressed, and the microcontroller (12) controls the electromagnet Y1 of the electromagnetic reversing valve (3) and the starting relay of the motor pump (10) to be energized, and the electromagnetic reversing valve (3) is connected to the right position, and the high-pressure oil enters the balance valve V2 port through the electromagnetic reversing valve (3). At this time, the one-way valve inside the one-way balance valve (8) is opened, and the oil enters the rod chamber of the tailgate oil cylinder (7) through the one-way valve, pushing the tailgate to close. When the tailgate oil cylinder (7) operates to drive the tailgate mechanism to close completely, the pressure in the system will increase instantaneously, the door closing pressure sensor P1 detects that the pressure has risen to a preset value, the microcontroller (12) determines that the door is fully closed, and the electromagnetic reversing valve (3) electromagnet Y1 loses power; the electromagnetic reversing valve (4) electromagnet Y3 is energized, the electromagnetic reversing valve (4) B working oil port is connected, and the high-pressure oil enters the hydraulic control check valve V1 port through the electromagnetic reversing valve (4), and then enters the rod chamber of the door lock oil cylinder (6), and the oil cylinder piston rod retracts to push the door lock mechanism to close; when the door lock oil cylinder runs to the stroke limit, the door lock mechanism has also run to the locking position, at this time the pressure in the system increases, the lock pressure sensor P3 detects that the pressure has risen to a preset value, the microcontroller (12) determines that the lock is fully closed, and the electromagnetic reversing valve (4) electromagnet Y3 and the motor pump (10) start relay lose power; thus completing the door closing action.

[0014] Furthermore, the stop button provided on the button box (13) can stop the action at any position during the door closing and opening process.

[0015] Furthermore, the microcontroller (12) independently determines the operating state of the tailgate device according to the button state of the button box (13) and the real-time pressure value of the pressure sensor (9), and uploads the information to the driver terminal via the bus.

[0016] Furthermore, the microcontroller starts monitoring synchronously during any operation of the tailgate device. If the pressure value of the action circuit does not reach the preset value under certain conditions and time limits, the microcontroller will report the corresponding action pipeline leakage fault to the driver terminal through the bus.

[0017] Furthermore, the microcontroller (12) detects the pressure value of the pressure sensor (9) in real time when the power is on. If the pressure sensor has no data to report or the reported data is abnormal, the microcontroller (12) reports a corresponding sensor fault alarm to the driver terminal; the microcontroller (12) delays the default unlocking, door opening, door closing, and locking actions according to the button status of the button box (13) to ensure the operation of the tailgate device.

[0018] Furthermore, a breather and an oil return filter are provided on the hydraulic oil tank (1).

[0019] Furthermore, the rated voltage of the motor pump (10) is DC24V, and it can be powered directly from the vehicle battery.

[0020] Effects of the present invention

[0021] The present invention adopts an intelligently controlled tailgate hydraulic device, which realizes one-touch door opening and closing, autonomous judgment of the tailgate operating status and system health status monitoring, and reduces the labor intensity of the operator; fault self-diagnosis and reporting, and autonomous entry into a degraded working mode in the event of sensor failure, thereby improving the reliability of the tailgate hydraulic device's operation and the convenience of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the system schematic diagram. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] The present invention provides a tailgate hydraulic device capable of realizing intelligent control. Figure 1The schematic diagram of a tailgate hydraulic device capable of realizing intelligent control mainly comprises: a hydraulic oil tank (1), a relief valve (2), a first electromagnetic reversing valve (3), a second electromagnetic reversing valve (4), a hydraulically controlled one-way valve (5), a door lock cylinder (6), a tailgate cylinder (7), a one-way balancing valve (8), a pressure sensor (9), a motor pump (10), a liquid level switch (11), a microcontroller (12), a button box (13), etc.

[0025] The rated voltage of the motor pump (10) is DC24V and can be directly powered by the vehicle battery; the oil suction port of the motor pump (10) is connected to the hydraulic oil tank (1) and sucks oil from the hydraulic oil tank, and the oil outlet of the motor pump (10) is connected to the overflow valve (2), the electromagnetic reversing valve (3), and the P port of the electromagnetic reversing valve (4); the working oil ports A and B of the electromagnetic reversing valve (3) are respectively connected to the working oil ports V1 and V2 of the one-way balance valve (8), and the working oil ports C1 and C2 of the one-way balance valve (8) are respectively connected to the rodless cavity and rod cavity oil ports of the tailgate cylinder (7) through pipelines, and the two tailgate cylinders are connected in parallel; the working oil ports A and B of the electromagnetic reversing valve (4) are respectively connected to the V2 and V1 oil ports of the hydraulic control one-way valve (5), and the C2 and C1 oil ports of the hydraulic control one-way valve (5) are respectively connected to the door lock oil The rodless chamber and the rod chamber oil ports of the cylinder (6) are connected, and the two door lock oil cylinders are connected in parallel. The pressure sensor (9) is used at four locations in the device: the P1 pressure sensor is connected to the working oil port B of the electromagnetic reversing valve (3) to measure the pressure of the door closing action circuit; the P2 pressure sensor is connected to the working oil port A of the electromagnetic reversing valve (3) to measure the pressure of the door opening action circuit; the P3 pressure sensor is connected to the working oil port B of the electromagnetic reversing valve (4) to measure the pressure of the locking action circuit; the P4 pressure sensor is connected to the working oil port A of the electromagnetic reversing valve (4) to measure the pressure of the unlocking action circuit; the T ports of the overflow valve (2), the electromagnetic reversing valve (3), and the electromagnetic reversing valve (4) are connected and merged through a pipeline and then returned to the return oil filter inlet of the hydraulic oil tank (1), thereby forming a complete hydraulic system.

[0026] The microcontroller (12) is connected to the electromagnetic reversing valve (3), the electromagnetic reversing valve (4), and the motor pump (10) through a control cable, and the button box (13) is connected to the microcontroller (12).

[0027] When the door opening button of the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (4) electromagnet Y4 and the motor pump (10) to start the relay first, and the electromagnetic reversing valve (4) A working oil port is connected. The motor pump (10) outputs high-pressure oil and enters the hydraulic control check valve (5) V2 port through the electromagnetic reversing valve (4), and then enters the rodless chamber of the door lock cylinder (6). The piston rod extends to push the door lock to open; when the door lock cylinder (6) runs to the stroke limit, it drives the door lock mechanism to open to the maximum angle. At this time, the pressure in the system will increase instantaneously. The unlocking pressure sensor P4 detects that the circuit pressure rises to the preset value (determined by the overflow pressure of the overflow valve (2)). The microcontroller (12) determines that the unlocking is in place, and the electromagnetic reversing valve (4) electromagnet Y4 fails. The electromagnetic reversing valve (3) electromagnet Y2 is energized, the electromagnetic reversing valve (3) A working oil port is connected, and the high-pressure oil enters the balance valve V1 port through the reversing valve, and then enters the rodless chamber of the tailgate oil cylinder (7), pushing the tailgate to open; a hydraulically controlled one-way valve is provided at the rod chamber outlet of the tailgate oil cylinder (7) to prevent the pipeline between the tailgate oil cylinder (7) and the one-way balance valve (8) from bursting and causing the tailgate to descend uncontrollably; when the tailgate oil cylinder (7) runs to the stroke limit, the tailgate is also driven to open to the maximum angle, at this time the pressure in the system increases, the door opening pressure sensor P2 detects that the pressure rises to the preset value, the microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the starting relay of the motor pump (10) lose power; thereby completing the one-button door opening action.

[0028] When the door closing button on the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (3), the electromagnet Y1 and the motor pump (10) to start the relay, and the electromagnetic reversing valve (3) is connected to the right position. The high-pressure oil enters the balance valve V2 port through the electromagnetic reversing valve (3). At this time, the one-way valve inside the one-way balance valve (8) opens, and the oil enters the rod chamber of the tailgate oil cylinder (7) through the one-way valve, pushing the tailgate to close. When the tailgate oil cylinder (7) operates to drive the tailgate mechanism to close completely, the pressure in the system will increase instantaneously, the door closing pressure sensor P1 detects that the pressure has risen to a preset value, the microcontroller (12) determines that the door is fully closed, and the electromagnetic reversing valve (3) electromagnet Y1 loses power; the electromagnetic reversing valve (4) electromagnet Y3 is energized, the electromagnetic reversing valve (4) B working oil port is connected, and the high-pressure oil enters the hydraulic control check valve V1 port through the electromagnetic reversing valve (4), and then enters the rod chamber of the door lock oil cylinder (6), and the oil cylinder piston rod retracts to push the door lock mechanism to close; when the door lock oil cylinder runs to the stroke limit, the door lock mechanism has also run to the locking position, at this time the pressure in the system increases, the lock pressure sensor P3 detects that the pressure has risen to a preset value, the microcontroller (12) determines that the lock is fully closed, and the electromagnetic reversing valve (4) electromagnet Y3 and the motor pump (10) start relay lose power; thus completing the door closing action.

[0029] The hydraulically controlled one-way valve (5) is used to lock the door lock oil cylinder circuit to prevent the door lock mechanism from loosening due to vehicle vibration and bumping during vehicle driving.

[0030] The one-way balancing valve (8) is used as a load holding valve in the tailgate opening circuit to prevent the tailgate from stalling and falling due to the influence of its own weight.

[0031] The button box (13) is provided with a stop button, which can stop the action at any position during the door closing and opening process.

[0032] The microcontroller (12) independently determines the operating state of the tailgate device according to the key state of the button box (13) and the real-time pressure value of the pressure sensor (9), and uploads the information to the driver terminal via the bus.

[0033] The microcontroller (12) starts monitoring synchronously during any operation of the tailgate device. If the pressure value of the action circuit does not reach a preset value under certain conditions and time limits, the microcontroller (12) reports a corresponding action circuit leakage fault to the driver terminal through the bus.

[0034] The microcontroller (12) detects the pressure value of the pressure sensor (9) in real time when the power is on. If the pressure sensor does not report any data or the reported data is abnormal, the microcontroller (12) reports a corresponding sensor fault alarm to the driver terminal. At the same time, the control system automatically enters a degraded working mode: the microcontroller (12) performs the unlocking, opening, closing, locking and other actions by delaying the default according to the button status of the button box (13) to ensure the operation of the tailgate device.

[0035] A breather and a return oil filter are provided on the hydraulic oil tank (1). A liquid level switch (11) is installed on the hydraulic oil tank. When the liquid level in the tank is lower than the alarm value of the liquid level switch (11), the microcontroller (12) reports a low liquid level alarm to the driver terminal and prevents the motor pump (10) from starting.

Claims

1. A tailgate hydraulic device capable of realizing intelligent control, characterized in that: It comprises a hydraulic oil tank (1), an overflow valve (2), a first electromagnetic reversing valve (3), a second electromagnetic reversing valve (4), a hydraulically controlled one-way valve (5), a door lock oil cylinder (6), a tailgate oil cylinder (7), a one-way balancing valve (8), a pressure sensor (9), a motor pump (10), a liquid level switch (11), a microcontroller (12), and a button box (13); the hydraulically controlled one-way valve (5) is used to lock the door lock oil cylinder circuit to prevent the door lock mechanism from loosening due to vehicle vibration and bumping during vehicle driving; the one-way balancing valve (8) is used as a load holding valve for the tailgate opening circuit to prevent the tailgate from stalling and falling due to the influence of its own weight; The oil suction port of the motor pump (10) is connected to the hydraulic oil tank (1) and draws oil from the hydraulic oil tank. The oil outlet of the motor pump (10) is connected to the P port of the overflow valve (2), the electromagnetic reversing valve 1 (3), and the electromagnetic reversing valve 2 (4). The working oil ports A and B of the electromagnetic reversing valve 1 (3) are respectively connected to the working oil ports V1 and V2 of the one-way balance valve (8). The working oil ports C1 and C2 of the one-way balance valve (8) are respectively connected to the rodless cavity and rod cavity oil ports of the tailgate cylinder (7) through pipelines. The two tailgate cylinders are connected in parallel. The working oil ports A and B of the electromagnetic reversing valve 2 (4) are respectively connected to the V2 and V1 oil ports of the hydraulic control one-way valve (5). The C2 and C1 oil ports of the hydraulic control one-way valve (5) are respectively connected to the rodless cavity and rod cavity oil ports of the door lock cylinder (6) through pipelines. The two door lock cylinders are connected in parallel. Connection method; the pressure sensor (9) includes a P1 pressure sensor, a P2 pressure sensor, a P3 pressure sensor, and a P4 pressure sensor; the P1 pressure sensor is connected to the B working oil port of the electromagnetic reversing valve (3) to measure the pressure of the door closing action circuit; the P2 pressure sensor is connected to the A working oil port of the electromagnetic reversing valve (3) to measure the pressure of the door opening action circuit; the P3 pressure sensor is connected to the B working oil port of the electromagnetic reversing valve (4) to measure the pressure of the locking action circuit; the P4 pressure sensor is connected to the A working oil port of the electromagnetic reversing valve (4) to measure the pressure of the unlocking action circuit; the T ports of the overflow valve (2), the electromagnetic reversing valve (3), and the electromagnetic reversing valve (4) are connected and merged through pipelines and then returned to the return oil filter inlet of the hydraulic oil tank (1), thereby forming a complete hydraulic system; The microcontroller (12) is connected to the electromagnetic reversing valve 1 (3), the electromagnetic reversing valve 2 (4), and the motor pump (10) through a control cable, and the button box (13) is connected to the microcontroller (12); The liquid level switch (11) is installed on the hydraulic oil tank. When the liquid level in the hydraulic oil tank is lower than the alarm value of the liquid level switch (11), the microcontroller (12) reports a low liquid level alarm to the driver terminal and the protection motor pump (10) is not started.

2. The tailgate hydraulic device capable of realizing intelligent control according to claim 1, characterized in that: The button box (13) is provided with a door opening button, a door closing button and a stop button.

3. The tailgate hydraulic device capable of realizing intelligent control according to claim 2, characterized in that: When the door opening button of the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve 2 (4) electromagnet Y4 and the motor pump (10) to start the relay, which is first energized. The electromagnetic reversing valve 2 (4) A working oil port is connected, and the motor pump (10) outputs high-pressure oil through the electromagnetic reversing valve 2 (4) into the hydraulic control check valve (5) V2 port, and then into the rodless chamber of the door lock cylinder (6). The piston rod extends to push the door lock open; when the door lock cylinder (6) runs to the stroke limit, it drives the door lock mechanism to open to the maximum angle. At this time, the pressure in the system will increase instantaneously. The unlocking pressure sensor P4 detects that the circuit pressure rises to the preset value. The preset value is determined by the overflow pressure of the overflow valve (2). The microcontroller (12) determines that the unlocking is in place, and the electromagnetic reversing valve 2 (4) electromagnet Y 4 loses power; the electromagnetic reversing valve (3) electromagnet Y2 is energized, the electromagnetic reversing valve (3) A working oil port is connected, and the high-pressure oil enters the balance valve V1 port through the reversing valve, and then enters the tailgate cylinder (7) rodless chamber, pushing the tailgate to open; a hydraulically controlled one-way valve is provided at the tailgate cylinder (7) rod chamber outlet to prevent the pipeline between the tailgate cylinder (7) and the one-way balance valve (8) from bursting and causing the tailgate to descend uncontrollably; when the tailgate cylinder (7) runs to the stroke limit, it drives the tailgate to open to the maximum angle, at this time the pressure in the system increases, the door opening pressure sensor P2 detects that the pressure rises to the preset value, the microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the starting relay of the motor pump (10) lose power; thereby completing the one-button door opening action.

4. The tailgate hydraulic device capable of realizing intelligent control according to claim 2, characterized in that: When the door closing button of the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (3) electromagnet Y1 and the motor pump (10) to start the relay, and the electromagnetic reversing valve (3) is connected to the right position. The high-pressure oil enters the balance valve V2 port through the electromagnetic reversing valve (3). At this time, the one-way valve inside the one-way balance valve (8) opens, and the oil enters the rod chamber of the tailgate cylinder (7) through the one-way valve, pushing the tailgate to close. When the tailgate cylinder (7) is running and drives the tailgate mechanism to close completely, the pressure in the system will increase instantaneously. The door closing pressure sensor P1 detects that the pressure rises to the preset value. The microcontroller (12) determines that the door is closed in place, and the electromagnetic reversing valve ( 3) Electromagnet Y1 loses power; electromagnetic reversing valve 2 (4) electromagnetic Y3 is energized, electromagnetic reversing valve 2 (4) B working oil port is connected, high-pressure oil enters the hydraulic control check valve V1 port through electromagnetic reversing valve 2 (4), and then enters the rod chamber of the door lock cylinder (6), and the cylinder piston rod retracts to push the door lock mechanism to close; when the door lock cylinder runs to the stroke limit, it drives the door lock mechanism to run to the locking position. At this time, the pressure in the system increases, and the locking pressure sensor P3 detects that the pressure rises to the preset value. The microcontroller (12) determines that the lock is in place, and the electromagnetic reversing valve 2 (4) electromagnetic Y3 and the motor pump (10) start relay lose power; thus completing the door closing action.

5. The tailgate hydraulic device capable of realizing intelligent control according to claim 2, characterized in that: The stop button provided on the button box (13) can stop the action at any position during the door closing and opening process.

6. A tailgate hydraulic device capable of realizing intelligent control according to claim 3, 4 or 5, characterized in that: The microcontroller (12) autonomously determines the operating state of the tailgate device according to the button state of the button box (13) and the real-time pressure value of the pressure sensor (9), and uploads the information to the driver terminal via the bus.

7. The tailgate hydraulic device capable of realizing intelligent control according to claim 6, characterized in that: The microcontroller starts monitoring synchronously during any operation of the tailgate device. If the pressure value of the action circuit does not reach the preset value under certain conditions and time limits, the microcontroller will report the corresponding action pipeline leakage fault to the driver terminal through the bus.

8. The tailgate hydraulic device capable of realizing intelligent control according to claim 6, characterized in that: The microcontroller (12) detects the pressure value of the pressure sensor (9) in real time when the power is on. When the pressure sensor has no data to report or the reported data is abnormal, the microcontroller (12) reports a corresponding sensor fault alarm to the driver terminal. The microcontroller (12) delays the default unlocking, door opening, door closing, and locking actions according to the button status of the button box (13) to ensure the operation of the tailgate device.

9. The tailgate hydraulic device capable of realizing intelligent control according to claim 1, characterized in that: A breather and an oil return filter are provided on the hydraulic oil tank (1).

10. The tailgate hydraulic device capable of realizing intelligent control according to claim 1, characterized in that: The motor pump (10) has a rated voltage of DC24V and can be powered directly from the vehicle battery.

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