Aircraft tail cabin door folding and unfolding hydraulic system and control method

Abstract

The invention belongs to the technical field of hydraulic systems, and discloses an aircraft tail cabin door folding and unfolding hydraulic system and a control method. The tail cabin door folding and unfolding control module is used for controlling a hydraulic source to provide pressure for two upper cabin door actuating cylinders, two lower cabin door actuating cylinders, an upper cabin door lock and a lower cabin door lock; control panels are arranged outside the driving cabin, the passenger and cargo cabin and the machine body; the cockpit control panel is provided with a lower cabin door control knob, an upper cabin door control knob and a cockpit passenger and cargo cabin permission switching button; the passenger and cargo cabin control panel is provided with a lower cabin door control switch, an upper cabin door control switch and a horizontal switch; and the external control panel is provided with a tail cabin door control switch.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic systems, and in particular relates to a hydraulic system for retracting and extending an aircraft tail door and a control method thereof. Background Art

[0002] The retraction and extension of the helicopter tail door is one of the necessary functions of large transport helicopters, which is convenient for loading personnel and cargo. At present, there are several ways to open and close the helicopter tail door, such as mechanical, electrical, and hydraulic. Because hydraulic pressure has the characteristics of simple structure, strong load-bearing capacity, convenient and stable operation, the tail door of large transport helicopters mostly uses hydraulic pressure as the power source. The control method is basically to directly operate the on-off of the tail door combination valve in the passenger and cargo compartment to control the opening and closing of the tail door. The control method is single, and it is impossible to achieve multi-zone control or open to a specific angle. The door lock needs to rely on an external mechanical lock to lock, and the pilot cannot monitor the current position of the door and the door lock status in real time. Summary of the invention

[0003] Purpose of the invention: The invention relates to a helicopter tail door retraction and extension hydraulic system control logic, which can control the opening and closing of the door at three positions: the cockpit, the passenger and cargo compartment, and the outside of the fuselage, and can also provide real-time feedback of the door's opening and closing status to the pilot.

[0004] Technical Solution

[0005] A hydraulic system for retracting and extending a tail door of an aircraft, the system comprising:

[0006] A hydraulic source is used to provide pressure;

[0007] The rear hatch door retraction and extension control module controls the hydraulic source to provide pressure for two upper hatch door actuators, two lower hatch door actuators, one upper hatch door lock, and one lower hatch door lock;

[0008] There are control panels in the cockpit, passenger and cargo compartments, and outside the fuselage;

[0009] The cockpit control panel is equipped with a lower door control knob, an upper door control knob and a cockpit passenger and cargo compartment authority switching button;

[0010] The passenger and cargo compartment control panel is equipped with a lower door control switch, an upper door control switch, and a horizontal switch;

[0011] The external control panel has the tailgate control switch.

[0012] A method for controlling a hydraulic system for retracting and extending an aircraft tail door, comprising the following steps:

[0013] Step 1: Determine the control authority. If the authority is in the cockpit, go to step 2, otherwise go to step 3;

[0014] Step 2: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is open, go to step 5;

[0015] Determine the control command of the lower hatch; if it is closed, proceed to step six, if it is horizontal, proceed to step seven, if it is open, proceed to step eight;

[0016] Step 3: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is stopped, go to step 9, if it is opened, go to step 5;

[0017] Determine the control command of the lower hatch; if it is closed, go to step six, if it is horizontal, go to step seven, if it is stopped, go to step ten, if it is open, go to step eight;

[0018] Step 4: driving the upper door actuator to close the upper door;

[0019] Step 5: driving the upper door actuator to open the upper door;

[0020] Step 6: Drive the lower door actuator to close the lower door;

[0021] Step 7: Drive the lower door actuator to adjust the lower door to a horizontal position;

[0022] Step 8: driving the lower door actuator to open the lower door;

[0023] Step 9: Drive the upper door actuator to keep the upper door at the current position;

[0024] Step 10: Drive the lower door actuator to keep the lower door at the current position.

[0025] Further, in step four, the electromechanical management computer receives the "close" command for the upper cabin door, and the electromechanical management computer controls the tail cabin door retraction and extension control module to supply pressure to the rodless chambers of the two actuators on both sides of the upper cabin door at the same time, so that they extend at the same time. After the LVDT detects that the upper cabin door is completely closed, the electromechanical management computer controls the tail cabin door retraction and extension control module to stop supplying pressure to the upper cabin door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the tail cabin door retraction and extension control module to supply pressure to the upper cabin door lock to lock it. After the "position switch" detects that the upper tail cabin door lock has been locked, the electromechanical management computer controls the tail cabin door retraction and extension control module to stop supplying pressure to the upper cabin door lock. At the same time, the "cockpit control panel" and "passenger and cargo compartment control panel" display the upper tail cabin door as "locked", and the cockpit display shows that the upper cabin door is "closed" and the upper cabin door lock is "locked".

[0026] Further, in step five, the electromechanical management computer receives an "open" command for the upper cabin door, and the electromechanical management computer controls the tail cabin door retraction and extension control module to supply pressure to the upper cabin door lock to unlock it. When the "position switch" detects that the upper cabin door lock has been unlocked, the electromechanical management computer controls the tail cabin door retraction and extension control module to stop supplying pressure to the upper cabin door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the upper cabin door. Two seconds later, the electromechanical management computer controls the tail cabin door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the upper cabin door to retract them at the same time. After the LVDT detects that the upper cabin door is fully opened, the electromechanical management computer controls the tail cabin door retraction and extension control module to stop supplying pressure to the upper cabin door actuator, and the actuator stops moving. The cockpit display screen displays that the upper cabin door is "open" and the upper cabin door lock is "unlocked".

[0027] Further, in step six, the electromechanical management computer receives the "close" command for the lower hatch door, and the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower hatch door at the same time, so that they retract at the same time. After the LVDT detects that the lower hatch door is completely closed, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the lower hatch door lock to lock it. After the "position switch" detects that the lower hatch door lock has completed locking, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door lock. At the same time, the "cockpit control panel" and "passenger and cargo compartment control panel" display the lower hatch door as "locked", and the cockpit display shows that the lower hatch door is "closed" and the lower hatch door lock is "locked".

[0028] Further, in step seven, the electromechanical management computer receives the "horizontal" instruction, and the LVDT detects whether the lower door is in the closed position. If it is in the closed position, the electromechanical management computer controls the tail door retracting and extending control module to supply pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock has been unlocked, the "cockpit control panel" and the "passenger and cargo compartment control panel" display "unlock" for the lower tail door. Two seconds later, the electromechanical management computer controls the tail door retracting and extending control module to supply pressure to the rodless chambers of the two actuators on both sides of the lower door to extend them at the same time. After the LVDT detects that the lower door is in the horizontal position, the electromechanical management computer controls the tail door retracting and extending control module to stop supplying pressure to the lower door actuator, and the actuator stops moving.

[0029] If the LVDT detects that the lower door is not in the closed position, and if the LVDT detects that the door opening angle is greater than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower door, so that they are retracted to the horizontal position at the same time. If the LVDT detects that the door opening angle is less than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to control the rodless chambers of the two actuators on both sides of the lower door to supply pressure to the horizontal position at the same time. The cockpit display screen shows that the lower door is "horizontal" and the lower door lock is "unlocked".

[0030] Further, in step eight, the electromechanical management computer receives the "open" command for the lower hatch door, and the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the lower hatch door lock to unlock it. When the "position switch" detects that the lower hatch door lock has been unlocked, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower hatch door. Two seconds later, the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the rodless cavities of the two actuators on both sides of the lower hatch door to extend them at the same time. After the LVDT detects that the lower hatch door is fully opened, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door actuator, and the actuator stops moving. The cockpit display screen displays that the lower hatch door is "open" and the lower hatch door lock is "unlocked".

[0031] Further, in step nine, the electromechanical management computer receives a "stop" command for the upper door, and the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the upper door actuator, thereby controlling the upper door actuator to be in the current position.

[0032] Further, the electromechanical management computer receives a "stop" command for the lower door, and the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door actuator, thereby controlling the lower door actuator to be in the current position.

[0033] Furthermore, in step 3, the ground state is determined. If it is empty, the external control panel is disabled. If it is ground, the instructions of the internal and external control panels are received at the same time, but the control instructions of the internal panel have a higher priority than the external panel.

[0034] Determine the external control panel instruction. If the external control panel instruction is "off", proceed to step 4 and step 6 at the same time. If the external control panel instruction is "on", proceed to step 5 and step 8 at the same time.

[0035] In summary, the beneficial effects of the present invention are as follows:

[0036] The invention relates to a control logic of a helicopter tail door retracting and extending hydraulic system, which can control the opening and closing of the door at three positions: a cockpit, a passenger and cargo compartment, and an exterior of the fuselage, and can also provide real-time feedback of the door's opening and closing status to the pilot. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the control logic diagram of the hydraulic system for the retracting and extending of the tail hatch;

[0038] Figure 2 This is the tail hatch status display diagram;

[0039] Figure 3 This is the cabin door control logic diagram under the cockpit control panel;

[0040] Figure 4 This is the door control logic diagram on the cockpit control panel;

[0041] Figure 5 This is the control logic diagram of the lower hatch door of the passenger and cargo hold control panel;

[0042] Figure 6 This is the cabin door control logic diagram on the passenger and cargo compartment control panel;

[0043] Figure 7 This is the logic diagram of the hatch control for the external control panel. DETAILED DESCRIPTION

[0044] The present invention relates to a tail hatch door retracting and extending hydraulic system, and its logic control diagram is as follows: Figure 1 The main hydraulic system of the helicopter provides a hydraulic source, which controls the rear hatch door retraction and extension control module to provide pressure for two upper hatch door actuators, two lower hatch door actuators, an upper hatch door lock, and a lower hatch door lock. The LVDT (Linear Displacement Transducer) monitors the hatch door opening position by detecting the extension length of the actuator.

[0045] The operator can operate the tail door to open and close in three locations: the cockpit, the cargo compartment, and the outside of the fuselage. The "tail door authority" switch on the cockpit control panel can control the operation authority in the "cockpit control panel" or the "cargo compartment control panel". The "cockpit control panel" can control the opening or closing of the upper and lower doors, and display the "locked" and "unlocked" status of the doors; the "cargo compartment control panel" can control the opening or closing of the upper and lower doors, and the opening of the lower door to the horizontal position; the "external control panel" can only control the opening or closing of the upper and lower doors at the same time.

[0046] At the same time, the "open", "horizontal", "closed" position and "locked" and "unlocked" status of the lower door can be displayed in real time on the cockpit display screen, and the "open", "closed" position and "locked" and "unlocked" status of the upper door can be displayed.

[0047] Cockpit control panel

[0048] (1) Lower hatch:

[0049] 1) Manually turn the "lower tail door switch" to the "open" position, and the tail door retraction and extension control module supplies pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock is unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower tail door, and the tail door retraction and extension control module controls the lower door actuator to extend until the lower door is fully opened;

[0050] 2) Manually turn the "lower tail door switch" to the "closed" position, the tail door retraction control module controls the lower door actuator to retract until the lower door is completely closed, the tail door retraction control module supplies pressure to the lower tail door lock to lock it, and the lower tail door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked";

[0051] 3) Manually turn the "lower tail door switch" to the "horizontal" position. When the lower door is in the closed position, the tail door retraction and extension control module supplies pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock has been unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower tail door, and the tail door retraction and extension control module controls the lower door actuator to extend to the horizontal position; when the lower door is not in the closed position, the tail door retraction and extension control module controls the lower door actuator to move to the horizontal position.

[0052] (2) Upper door:

[0053] 1) Manually turn the "upper tail door switch" to the "open" position, and the tail door retraction and extension control module supplies pressure to the upper tail door lock to unlock it. When the "position switch" detects that the upper tail door lock is unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the upper tail door, and the tail door retraction and extension control module controls the upper door actuator to retract until the lower door is fully opened.

[0054] 2) Manually turn the "upper tail door switch" to the "closed" position, the tail door retraction and extension control module controls the upper door actuator to extend until the lower door is completely closed, the tail door retraction and extension control module supplies pressure to the upper tail door lock to lock it, and the upper tail door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked".

[0055] 2. Passenger and cargo warehouse control panel

[0056] (1) Lower hatch:

[0057] 1) Manually turn the "lower tail door switch" to the "open" position, and the tail door retraction and extension control module supplies pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock is unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower tail door, and the tail door retraction and extension control module controls the lower door actuator to extend until the lower door is fully opened;

[0058] 2) Manually turn the "lower tail door switch" to the "closed" position, the tail door retraction control module controls the lower door actuator to retract until the lower door is completely closed, the tail door retraction control module supplies pressure to the lower tail door lock to lock it, and the lower tail door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked";

[0059] 3) Manually turn the "lower tail door switch" to the "stop" position, the tail door retraction and extension control module stops supplying pressure, and the control actuator is in the current position;

[0060] 4) Manually press the "Horizontal" button. When the lower door is in the closed position, the tail door retraction and extension control module supplies pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock has been unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower tail door, and the tail door retraction and extension control module controls the lower door actuator to extend to the horizontal position; when the lower door is not in the closed position, the tail door retraction and extension control module controls the lower door actuator to move to the horizontal position.

[0061] (2) Upper door:

[0062] 1) Manually turn the "upper tail door switch" to the "open" position, and the tail door retraction and extension control module supplies pressure to the upper tail door lock to unlock it. When the "position switch" detects that the upper tail door lock is unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the upper tail door, and the tail door retraction and extension control module controls the upper door actuator to retract until the lower door is fully opened.

[0063] 2) Manually turn the "upper tail door switch" to the "closed" position, the tail door retraction and extension control module controls the upper door actuator to extend until the lower door is completely closed, the tail door retraction and extension control module supplies pressure to the upper tail door lock to lock it, and the upper tail door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked".

[0064] 3) Manually turn the "upper tail door switch" to the "stop" position, the tail door retraction and extension control module stops supplying pressure, and the control actuator is in the current position;

[0065] 3. External control panel

[0066] When the "wheel-load switch" is in the non-air state, the "tail door switch" is manually turned to the "open" position, and the tail door retraction and extension control module supplies pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock is completely unlocked, the "cockpit control panel" and the "passenger and cargo compartment control panel" display "unlock" for the lower tail door, and the tail door retraction and extension control module controls the lower door actuator to extend until the lower door is fully opened; at the same time, the tail door retraction and extension control module supplies pressure to the upper tail door lock to unlock it. When the "position switch" detects that the upper tail door lock is completely unlocked, the "cockpit control panel" and the "passenger and cargo compartment control panel" display "unlock" for the upper tail door, and the tail door retraction and extension control module controls the upper door actuator to retract until the lower door is fully opened.

[0067] When the "wheel-load switch" is in the non-air state, manually turn the "tail door switch" to the "closed" position, the tail door retraction and extension control module controls the lower door actuator to retract until the lower door is completely closed, the tail door retraction and extension control module supplies pressure to the lower tail door lock to lock it, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "locked" for the lower tail door; at the same time, the tail door retraction and extension control module controls the upper door actuator to extend until the lower door is completely closed, the tail door retraction and extension control module supplies pressure to the upper tail door lock to lock it, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "locked" for the upper tail door.

[0068] When the "wheel-load switch" is in the non-air state, manually turn the "tail door switch" to the "stop" position, the tail door retraction and extension control module stops supplying pressure, and controls the actuator to be in the current position.

[0069] Step 1: Determine the control authority. If the authority is in the cockpit, proceed to step 2. If the authority is in the passenger and cargo compartment, determine whether the forced connection is in the "normal" position. If it is in the "normal position", proceed to step 3. Otherwise, there is no need to consider the "position switch" signal in step 3.

[0070] Step 2: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is open, go to step 5;

[0071] Determine the control command of the lower hatch; if it is closed, proceed to step six, if it is horizontal, proceed to step seven, if it is open, proceed to step eight;

[0072] Step 3: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is stopped, go to step 9, if it is opened, go to step 5;

[0073] Determine the control command of the lower hatch; if it is closed, go to step six, if it is horizontal, go to step seven, if it is stopped, go to step ten, if it is open, go to step eight;

[0074] Step 4: The electromechanical management computer receives the "close" command for the upper door from the cockpit tail door control panel. The electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the two rodless chambers of the actuators on both sides of the upper door at the same time, so that they extend at the same time. After the LVDT detects that the upper door is completely closed, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the upper door lock to lock it. After the "position switch" detects that the upper tail door lock has been locked, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door lock. At the same time, the "cockpit control panel" and "passenger and cargo compartment control panel" display the upper tail door as "locked", and the cockpit display shows that the upper door is "closed" and the upper door lock is "locked".

[0075] Step 5: The electromechanical management computer receives the "open" command for the upper door from the cockpit tail door control panel, and the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the upper tail door lock to unlock it. When the "position switch" detects that the upper tail door lock has been unlocked, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the upper tail door. Two seconds later, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the upper door to retract them at the same time. After the LVDT detects that the upper door is fully opened, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door actuator, and the actuator stops moving. The cockpit display screen displays the upper door as "open" and the upper door lock as "unlocked".

[0076] Step 6: The electromechanical management computer receives the "close" command for the lower door from the passenger and cargo compartment rear door control panel. The electromechanical management computer controls the rear door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower door at the same time, so that they retract at the same time. After the LVDT detects that the lower door is completely closed, the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the rear door retraction and extension control module to supply pressure to the lower door lock to lock it. After the "position switch" detects that the lower rear door lock has been locked, the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door lock. At the same time, the lower rear door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked", and the cockpit display shows that the lower door is "closed" and the lower door lock is "locked".

[0077] Step 7: The electromechanical management computer receives the "horizontal" command from the cockpit control panel or the passenger and cargo compartment rear hatch control panel, and the LVDT detects whether the lower hatch door is in the closed position. If it is in the closed position, the electromechanical management computer controls the rear hatch door retraction and extension control module to supply pressure to the lower hatch door lock to unlock it. When the "position switch" detects that the lower hatch door lock is unlocked, the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower hatch door. After two seconds, the electromechanical management computer controls the rear hatch door retraction and extension control module to supply pressure to the rodless chambers of the two actuators on both sides of the lower hatch door to extend them at the same time. After the LVDT detects that the lower hatch door is in the horizontal position, the electromechanical management computer controls the rear hatch door retraction and extension control module to stop supplying pressure to the lower hatch door actuator, and the actuator stops moving.

[0078] If the LVDT detects that the lower door is not in the closed position, and if the LVDT detects that the door opening angle is greater than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower door, so that they are retracted to the horizontal position at the same time. If the LVDT detects that the door opening angle is less than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to control the rodless chambers of the two actuators on both sides of the lower door to supply pressure to the horizontal position at the same time. The cockpit display screen shows that the lower door is "horizontal" and the lower door lock is "unlocked".

[0079] Step 8: The electromechanical management computer receives the "open" command for the lower door from the passenger and cargo compartment rear door control panel, and the electromechanical management computer controls the rear door retraction and extension control module to supply pressure to the lower rear door lock to unlock it. When the "position switch" detects that the lower rear door lock has been unlocked, the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower rear door. Two seconds later, the electromechanical management computer controls the rear door retraction and extension control module to supply pressure to the rodless cavities of the two actuators on both sides of the lower door to extend them at the same time. After the LVDT detects that the lower door is fully opened, the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door actuator, and the actuator stops moving. The cockpit display shows that the lower door is "open" and the lower door lock is "unlocked".

[0080] Step 9: The electromechanical management computer receives the "stop" command for the upper door from the passenger and cargo compartment rear door control panel, and the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the upper door actuator, and controls the upper door actuator to be in the current position;

[0081] Step 10: The electromechanical management computer receives a "stop" command for the lower door from the passenger and cargo compartment rear door control panel, and the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the lower door actuator, and controls the lower door actuator to be in the current position;

[0082] In step three, the ground state is determined. If it is empty, the external control panel is disabled. If it is ground, the instructions of the internal and external control panels are received at the same time, but the control instructions of the internal panel have a higher priority than the external panel.

[0083] Determine the external control panel instruction. If the external control panel instruction is "off", proceed to step 4 and step 6 at the same time. If the external control panel instruction is "on", proceed to step 5 and step 8 at the same time.

Claims

1. An aircraft tail door retracting and extending hydraulic system, characterized in that: The system includes: A hydraulic source is used to provide pressure; The rear hatch door retraction and extension control module controls the hydraulic source to provide pressure for two upper hatch door actuators, two lower hatch door actuators, one upper hatch door lock, and one lower hatch door lock; There are control panels in the cockpit, passenger and cargo compartments, and outside the fuselage; The cockpit control panel is equipped with a lower door control knob, an upper door control knob and a cockpit passenger and cargo compartment authority switching button; The passenger and cargo compartment control panel is equipped with a lower door control switch, an upper door control switch, and a horizontal switch; The external control panel has the tailgate control switch.

2. A method for controlling an aircraft tail door retractable hydraulic system, used to control the system of claim 1, characterized in that: Here are the steps: Step 1: Determine the control authority. If the authority is in the cockpit, go to step 2, otherwise go to step 3; Step 2: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is open, go to step 5; Determine the control command of the lower hatch; if it is closed, proceed to step six, if it is horizontal, proceed to step seven, if it is open, proceed to step eight; Step 3: Determine the control command of the upper hatch, if it is closed, go to step 4, if it is stopped, go to step 9, if it is opened, go to step 5; Determine the control command for the lower hatch; If it is closed, go to step six, if it is horizontal, go to step seven, if it is stopped, go to step ten, if it is open, go to step eight; Step 4: driving the upper door actuator to close the upper door; Step 5: driving the upper door actuator to open the upper door; Step 6: Drive the lower door actuator to close the lower door; Step 7: Drive the lower door actuator to adjust the lower door to a horizontal position; Step 8: driving the lower door actuator to open the lower door; Step 9: Drive the upper door actuator to keep the upper door at the current position; Step 10: Drive the lower door actuator to keep the lower door at the current position.

3. The method according to claim 2, characterized in that: In step 4, the electromechanical management computer receives the "close" command for the upper door, and the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the two rodless chambers of the actuators on both sides of the upper door at the same time, so that they extend at the same time. After the LVDT detects that the upper door is completely closed, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the upper door lock to lock it. After the "position switch" detects that the upper tail door lock has been locked, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door lock. At the same time, the "cockpit control panel" and "passenger and cargo compartment control panel" display the upper tail door as "locked", the cockpit display shows the upper door as "closed", and the upper door lock is "locked".

4. The method according to claim 2, characterized in that: In step five, the electromechanical management computer receives the "open" command for the upper door, and the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the upper tail door lock to unlock it. When the "position switch" detects that the upper tail door lock has been unlocked, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the upper tail door. Two seconds later, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the upper door to retract them at the same time. After the LVDT detects that the upper door is fully opened, the electromechanical management computer controls the tail door retraction and extension control module to stop supplying pressure to the upper door actuator, and the actuator stops moving. The cockpit display screen displays the upper door as "open" and the upper door lock is "unlocked".

5. The method according to claim 2, characterized in that: In step six, the electromechanical management computer receives the "close" command for the lower hatch door, and the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower hatch door at the same time, so that they retract at the same time. After the LVDT detects that the lower hatch door is completely closed, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door actuator, and the actuator stops moving. Two seconds later, the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the lower hatch door lock to lock it. After the "position switch" detects that the lower hatch door lock has been locked, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door lock. At the same time, the lower hatch door on the "cockpit control panel" and "passenger and cargo compartment control panel" displays "locked", the cockpit display shows that the lower hatch door is "closed", and the lower hatch door lock is "locked".

6. The method according to claim 2, characterized in that: In step seven, the electromechanical management computer receives the "horizontal" command, and the LVDT detects whether the lower door is in the closed position. If it is in the closed position, the electromechanical management computer controls the tail door retracting and extending control module to supply pressure to the lower tail door lock to unlock it. When the "position switch" detects that the lower tail door lock is unlocked, the "cockpit control panel" and the "passenger and cargo compartment control panel" display "unlock" for the lower tail door. After two seconds, the electromechanical management computer controls the tail door retracting and extending control module to supply pressure to the rodless chambers of the two actuators on both sides of the lower door to extend them at the same time. After the LVDT detects that the lower door is in the horizontal position, the electromechanical management computer controls the tail door retracting and extending control module to stop supplying pressure to the lower door actuator, and the actuator stops moving. If the LVDT detects that the lower door is not in the closed position, and if the LVDT detects that the door opening angle is greater than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to supply pressure to the rod chambers of the two actuators on both sides of the lower door, so that they are retracted to the horizontal position at the same time; if the LVDT detects that the door opening angle is less than the horizontal position angle, the electromechanical management computer controls the tail door retraction and extension control module to control the rodless chambers of the two actuators on both sides of the lower door to supply pressure to the horizontal position at the same time, and the cockpit display screen shows that the lower door is "horizontal" and the lower door lock is "unlocked".

7. The method according to claim 2, characterized in that: In step eight, the electromechanical management computer receives the "open" command for the lower hatch door, and the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the lower hatch door lock to unlock it. When the "position switch" detects that the lower hatch door lock has been unlocked, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door lock, and the "cockpit control panel" and "passenger and cargo compartment control panel" display "unlock" for the lower hatch door. Two seconds later, the electromechanical management computer controls the tail hatch door retraction and extension control module to supply pressure to the rodless cavities of the two actuators on both sides of the lower hatch door to extend them at the same time. After the LVDT detects that the lower hatch door is fully opened, the electromechanical management computer controls the tail hatch door retraction and extension control module to stop supplying pressure to the lower hatch door actuator, and the actuator stops moving. The cockpit display screen displays the lower hatch door as "open" and the lower hatch door lock is "unlocked".

8. The method according to claim 2, characterized in that: In step nine, the electromechanical management computer receives a "stop" command for the upper door, and the electromechanical management computer controls the rear door retraction and extension control module to stop supplying pressure to the upper door actuator, controlling the upper door actuator to be in the current position.

9. The method according to claim 2, characterized in that: The electromechanical management computer receives the "stop" command for the lower door, and controls the rear door retraction and extension control module to stop supplying pressure to the lower door actuator, controlling the lower door actuator to be in the current position.

10. The method according to claim 2, characterized in that: In step 3, the ground state is determined. If it is empty, the external control panel is disabled. If it is ground, the instructions of the internal and external control panels are received at the same time, but the control instructions of the internal panel have a higher priority than the external panel. Determine the external control panel instruction. If the external control panel instruction is "off", proceed to step 4 and step 6 at the same time. If the external control panel instruction is "on", proceed to step 5 and step 8 at the same time.

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