Tail gate hydraulic device capable of achieving intelligent control

Abstract

The invention belongs to the field of fluid transmission and control, and relates to a tail gate hydraulic device capable of achieving intelligent control. The device comprises a hydraulic oil tank, an overflow valve, a first electromagnetic directional valve, a second electromagnetic directional valve, a hydraulic control one-way valve, a door lock oil cylinder, a tail door oil cylinder, a one-way balance valve, a pressure sensor, a motor pump, a liquid level switch, a microcontroller and a button box. The intelligent control tail door hydraulic device is adopted, the microcontroller is adopted for control, one-key door opening and closing action, autonomous judgment of the running state of the tail door and system health state monitoring are achieved, and the labor intensity of operators is relieved; fault self-diagnosis and report are carried out, a degradation working mode is automatically entered under the condition that the sensor loses efficacy, and the operation reliability and the maintenance convenience of the tail gate hydraulic device are improved.

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, the tailgate opening forms of armored vehicles can be divided into side-opening type and seesaw type. For vehicles such as infantry fighting vehicles and medical vehicles, most use hydraulically driven seesaw tailgates. As part of the passage for soldiers to get on and off the vehicle, it has the characteristics of heavy weight and frequent opening, which leads to frequent failures of the hydraulic drive control device built by hardware relays. In order to ensure the reliability of the tailgate device, a manual mechanical locking device is generally set between the vehicle body and the door after the tailgate is closed. However, the opening and closing of this device is more troublesome. The operator must first open the mechanical locking structure, and then open the tailgate through the operation button set at the driver terminal or near the tailgate, and the same is true for closing the door.

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

[0004] (I) Purpose of the present invention

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

[0006] (II) 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 for 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 sucks 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 chamber and rod chamber 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 hydraulically controlled one-way valve (5). The C2 and C1 oil ports of the hydraulically controlled one-way valve (5) are respectively connected to the rodless chamber and rod chamber 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 electromagnetic reversing valve one (3) B working oil port to measure the pressure of the door closing action circuit; the P2 pressure sensor is connected to the electromagnetic reversing valve one (3) A working oil port to measure the pressure of the door opening action circuit; the P3 pressure sensor is connected to the electromagnetic reversing valve two (4) B working oil port to measure the pressure of the locking action circuit; the P4 pressure sensor is connected to the electromagnetic reversing valve two (4) A working oil port to measure the pressure of the unlocking action circuit; the T ports of the overflow valve (2), the electromagnetic reversing valve one (3), and the electromagnetic reversing valve two (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;

[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 protects the motor pump (10) from starting.

[0011] Furthermore, a door opening button, a door closing button and a stop button are arranged 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 through the electromagnetic reversing valve (4) into the hydraulic control check valve (5) V2 port, 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 a 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 arranged 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, and the pressure in the system increases at this time. The door opening pressure sensor P2 detects that the pressure rises to a preset value, and the microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the start relay of the motor pump (10) lose power; thereby completing the one-touch door opening action.

[0013] Furthermore, by pressing the door closing button of the button box (13), the microcontroller (12) controls the electromagnetic reversing valve (3) electromagnet Y1 and the motor pump (10) start relay to be energized, 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) 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 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 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, the door lock mechanism has also been driven to run to the locking position, and the pressure in the system increases at this time, the lock pressure sensor P3 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 (4) electromagnet Y3 and the motor pump (10) start relay lose power; thereby 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 process of closing and opening the door.

[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 result 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 reports 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 it is powered 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 can be powered directly from a vehicle battery.

[0020] Effects of the Invention

[0021] The present invention adopts an intelligently controlled tailgate hydraulic device, which realizes one-touch door opening and closing, autonomously determines the tailgate operating status and system health status monitoring, and reduces the labor intensity of operators; fault self-diagnosis and reporting, and autonomous entry into a degraded working mode in the event of sensor failure, improves the reliability of the tailgate hydraulic device 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 further described in detail below in conjunction with 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 it 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 chamber and rod chamber 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 hydraulically controlled one-way valve (5), and the C2 and C1 oil ports of the hydraulically controlled one-way valve (5) are respectively connected to the door lock oil ports through pipelines. 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 places in the device: 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 overflow valve (2), the electromagnetic reversing valve (3), and the T port of 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) start relay to be energized first, the electromagnetic reversing valve (4) A working oil port is connected, the motor pump (10) outputs high-pressure oil through the electromagnetic reversing valve (4) into the hydraulic control check valve (5) V2 port, and then into the rodless chamber of the door lock cylinder (6), and 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 a 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) is energized by the electromagnet Y2, and the electromagnetic reversing valve (3) A working oil port is connected. 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 arranged 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, and the door opening pressure sensor P2 detects that the pressure rises to a preset value. The microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the start relay of the motor pump (10) lose power. Thus, the one-touch door opening action is completed.

[0028] When the door closing button on the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (3) electromagnet Y1 and the motor pump (10) start relay to be energized, 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) 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 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 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, the door lock mechanism has also been driven to run to the locking position, and the pressure in the system increases at this time, the lock pressure sensor P3 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 (4) electromagnet Y3 and the motor pump (10) start relay lose power; thereby 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 its own weight.

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

[0032] The microcontroller (12) autonomously 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 result 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 it is powered 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. At the same time, the control system autonomously enters a degraded working mode: the microcontroller (12) performs the actions of unlocking, opening, closing, locking, etc. 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 arranged on the hydraulic oil tank (1). A liquid level switch (11) is installed on the hydraulic oil tank. When the liquid level in the 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.

Claims

1. A tailgate hydraulic device capable of realizing intelligent control, characterized in that: The invention 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 the driving process; 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 sucks 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 chamber and rod chamber 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 hydraulically controlled one-way valve (5). The C2 and C1 oil ports of the hydraulically controlled one-way valve (5) are respectively connected to the rodless chamber and rod chamber 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 electromagnetic reversing valve one (3) B working oil port to measure the pressure of the door closing action circuit; the P2 pressure sensor is connected to the electromagnetic reversing valve one (3) A working oil port to measure the pressure of the door opening action circuit; the P3 pressure sensor is connected to the electromagnetic reversing valve two (4) B working oil port to measure the pressure of the locking action circuit; the P4 pressure sensor is connected to the electromagnetic reversing valve two (4) A working oil port to measure the pressure of the unlocking action circuit; the T ports of the overflow valve (2), the electromagnetic reversing valve one (3), and the electromagnetic reversing valve two (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 protects the motor pump (10) from starting.

2. A tailgate hydraulic device capable of realizing intelligent control as claimed in 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. A tailgate hydraulic device capable of realizing intelligent control as claimed in 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 (4) electromagnet Y4 and the motor pump (10) start relay to be energized first, the electromagnetic reversing valve (4) A working oil port is connected, the motor pump (10) outputs high-pressure oil through the electromagnetic reversing valve (4) into the hydraulic control check valve (5) V2 port, and then into the rodless chamber of the door lock cylinder (6), and 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 a 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) is energized by the electromagnet Y2, and the electromagnetic reversing valve (3) A working oil port is connected. 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 arranged 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, and the door opening pressure sensor P2 detects that the pressure rises to a preset value. The microcontroller (12) determines that the door is fully opened, and the electromagnetic reversing valve (3) electromagnet Y2 and the start relay of the motor pump (10) lose power. Thus, the one-touch door opening action is completed.

4. A tailgate hydraulic device capable of realizing intelligent control as claimed in claim 2, characterized in that: When the door closing button on the button box (13) is pressed, the microcontroller (12) controls the electromagnetic reversing valve (3) electromagnet Y1 and the motor pump (10) start relay to be energized, 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) 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 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 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, the door lock mechanism has also been driven to run to the locking position, and the pressure in the system increases at this time, the lock pressure sensor P3 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 (4) electromagnet Y3 and the motor pump (10) start relay lose power; thereby completing the door closing action.

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

6. A tailgate hydraulic device capable of realizing intelligent control as claimed in claim 3, 4 or 5, characterized in that: The microcontroller (12) autonomously 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 result to the driver terminal via the bus.

7. A tailgate hydraulic device capable of realizing intelligent control as claimed in 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 as claimed in claim 6, characterized in that: The microcontroller (12) detects the pressure value of the pressure sensor (9) in real time when it is powered 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) performs the unlocking, door opening, door closing and locking actions by delaying the default 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 as claimed in claim 1, characterized in that: A breather and an oil return filter are arranged on the hydraulic oil tank (1).

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

Images