A locking device capable of preventing door killing

Abstract

The application provides a locking device capable of preventing door opening killing, comprising an external detection unit, a main control unit, a door locking device and a vehicle door lock connected with a vehicle door handle; the external detection unit is used for collecting video information of the rear of the vehicle body and sending the video information to the main control unit; the main control unit is used for processing the received video information, judging a door opening danger state and sending corresponding locking or releasing control instructions to the door locking device according to the door opening danger state; and the door locking device is used for locking or releasing the vehicle door according to the received locking or releasing control instructions. The application can assist a user in judging whether the environment outside the vehicle door is safe, enhances the restraint on the safety of getting off the vehicle for the driver and the passenger through the door locking device, and thus avoids the occurrence of the door opening killing phenomenon.

Description

Technical Field

[0001] This invention belongs to the field of automotive safety technology, specifically relating to a locking device that can prevent door-opening kills. Background Technology

[0002] With societal progress, the number of cars on the road will continue to increase. This increase in car ownership has brought heightened safety concerns. Many drivers and passengers fail to check their rearview mirrors and surrounding traffic (including other vehicles, pedestrians, etc.) before opening car doors, leading to "door-opening accidents." While the popular Dutch Reach method (using the hand furthest from the door to open it to reduce blind spots) can help ensure passengers check behind them to some extent, most passengers lack awareness of this method or simply don't use it as a rule. Furthermore, despite significant advancements in blind spot monitoring, which effectively mitigates door-opening accidents, this system is not yet perfect. It may fail to detect smaller moving objects like bicycles and motorcycles.

[0003] Patent CN 216893912 U discloses a novel door damping limiter that dampens the opening of a vehicle door, preventing it from opening and alerting the user to approaching objects behind, thus avoiding "door-opening-and-kill" accidents. Simultaneously, it can increase thrust in emergency situations to open the door and ensure the escape of occupants. However, this device uses an infrared detector, which is susceptible to external environmental influences and may fail to detect suddenly moving objects in a timely manner. Furthermore, the internal structure of the door damping limiter is complex, requiring functional expansion of the original vehicle infotainment system and adjustments to the internal door structure, making modification difficult. The device also exhibits significant internal displacement, which may lead to delayed door locking when faced with an opening restriction command, posing a considerable safety hazard.

[0004] Patent document CN202122376389.8 discloses a vehicle door anti-collision blocking system, which includes an infrared detector, a telescopic electromagnet, and an internal control module electrically connected to a power supply. The power supply provides operating power to the infrared detector and the telescopic electromagnet. The infrared detector is located on the side of the vehicle door, with its detection direction facing the rear of the vehicle body. The internal control module controls its on / off state with the power supply. The telescopic electromagnet is located at the hinge between the door and the vehicle body, with one end connected to the door and the other end connected to the vehicle body. When the telescopic electromagnet is energized and attracted, it can drive the door to close. This device uses a mechanical connection between the telescopic electromagnet and the vehicle body. In emergency situations or in the event of electrical failure, occupants cannot forcefully push open the door, thus posing a significant safety hazard.

[0005] Patent CN 215056293 U discloses a door limiter to prevent door-opening stop, including a limiter box, a limiter rod, a stop block, a limiter rod locking mechanism, and an inner handle. When the driver or passenger opens the door, they must first pull up the inner door latch of the vehicle body. When the door is opened to a small angle, the limiter rod locking mechanism locks the door. The driver or passenger must then close the limiter rod locking mechanism using the inner handle to fully open the door. This invention relies heavily on the driver's and passenger's active observation and fails to consider the mechanism's restraint on the door in cases where the driver or passenger's observation is not timely or in the event of an emergency.

[0006] Patent CN 112793529 A relates to a vehicle door warning device, method, and system. The device includes: an infrared camera, a processor, and a locking structure; the infrared camera is positioned at a predetermined location on the vehicle, ensuring that it captures environmental images within a predetermined range on the side of the vehicle door when the door is open; the processor, connected to both the infrared camera and the locking structure, receives the environmental images from the infrared camera, determines whether a moving object is present on the side of the door based on the images, and if so, generates and sends a locking command to the locking structure; the locking structure, connected to the rotating part of the vehicle door, locks the door hinge upon receiving the locking command, preventing the door from opening. The door locking mechanism of this system is described in a relatively simple manner and lacks a display structure, therefore its applicability to all vehicles is limited. Summary of the Invention

[0007] The purpose of this invention is to provide a locking device that can prevent door-opening-and-kill, thereby solving the problems mentioned in the background art, assisting users in determining whether the environment outside the vehicle door is safe, and strengthening the restraint on the safe exit of drivers and passengers through the door locking device, thereby preventing door-opening-and-kill phenomena from occurring.

[0008] This invention is achieved through the following technical solution:

[0009] A locking device for preventing door-opening kill includes: an external detection unit, a main control unit, a door locking device, and a door lock for connecting to the door handle;

[0010] The external detection unit is used to collect video information from the side and rear of the vehicle body and send it to the main control unit;

[0011] The main control unit is used to process the received video information, determine the danger of opening the door, and send corresponding locking or releasing control commands to the door locking device according to the danger of opening the door.

[0012] The door locking device is used to lock or release the vehicle door according to the received lock or release control command.

[0013] Preferably, the external detection unit includes a support block, an upper pressure plate, and a monitor;

[0014] The support block is connected to the upper pressure plate, and the monitor is pressed onto the support block by the upper pressure plate.

[0015] Furthermore, a vacuum suction cup is connected to the support block.

[0016] Furthermore, the support block is connected to the upper pressure plate via tension bolts.

[0017] Furthermore, the support block has an upper cavity, and a bottom support nest is provided inside the upper cavity. The monitor is located inside the bottom support nest, and an upper pressure ring is sleeved on the upper part of the monitor. The upper pressure plate is sleeved on the upper pressure ring.

[0018] Preferably, the door locking device includes a mounting plate and an emergency locking structure disposed on one side of the mounting plate; the emergency locking structure includes a driving device and a latching structure;

[0019] The drive unit receives locking or releasing control commands from the main control unit, and drives the latch structure to lock or release the door according to the received control commands.

[0020] Furthermore, the locking structure includes a worm gear, a semi-worm gear structure, and a locking latch; the output shaft of the drive device is connected to a first bevel gear, and one end of the worm gear is connected to a second bevel gear, with the first and second bevel gears meshing; the worm gear meshes with the semi-worm gear structure, and when the semi-worm gear structure rotates, it can actuate the locking latch to lock or release the door.

[0021] Furthermore, the door lock is mounted on the other side of the mounting plate.

[0022] Preferably, the main control unit includes a central processing unit, a displacement detector, and a signal transmitter;

[0023] The displacement detector is used to obtain the speed of the moving object based on the video information collected by the external detection unit.

[0024] The central processing unit is used to process the video information sent by the external detection unit and, in combination with the speed of the moving object obtained by the displacement detector, determine the dangerous state of opening the door.

[0025] The signal transmitter is used to send corresponding locking or releasing control commands to the door locking device according to the dangerous state of the door opening.

[0026] Preferably, the determination of the danger of opening the door specifically involves: segmenting the video information to generate a driving object and the driving area of ​​the driving object; if the speed of the driving object reaches a set speed threshold or the driving area of ​​the driving object is within a set danger area, then it is considered that there is a danger of opening the door; otherwise, it is considered that there is no danger.

[0027] Specifically, sending corresponding locking or releasing control commands to the door locking device based on the danger of opening the door means: when it is determined that there is a danger of opening the door, a locking control command is sent to the door locking device; when it is determined that there is no danger of opening the door, a releasing control command is sent to the door locking device.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The locking device for preventing door-opening accidents described in this invention uses an external detection unit to collect video information from the side and rear of the vehicle. The main control unit processes this video information to determine the movement status of objects moving behind the vehicle. Based on the object's movement status (including speed and position), it determines whether a door-opening accident is imminent. Based on the determination result, it controls the door locking device to lock or release the door. This invention adds a door locking device to existing door locks, thus serving as a supplementary device to car door locks. It can operate independently, even when the door lock is not engaged. Its advantages include a high level of security in safely locking the door, preventing accidental opening of the door under the control of the interior handle. When the door locking device is engaged, the door cannot be opened under either central locking or interior handle control, effectively reducing the burden of opening the door independently under separate latch control. Furthermore, this technology relies entirely on the detection device, reducing passenger anxiety when getting out of the vehicle during peak hours due to insufficient visibility. This door-opening-kill locking device assists drivers and passengers in assessing the safety of the outside environment when opening the vehicle door from the inside. The door locking device enhances the restraint on the safe exit of drivers and passengers, thus preventing them from opening the door in dangerous situations, even if they lack awareness of the "Dutch Reach" rule. The device can detect moving objects to the side and rear of the vehicle in advance, locking them in time when danger is imminent, preventing losses due to passengers' lack of timely observation, and preventing injury from vehicles passing by after the door has been opened. The door locking device created in this invention will lock the door once or twice under the drive of the main control unit. It has a rapid response, simple internal structure, strong security, and can be installed in any vehicle door. Compared with the related patents described above, it has advantages such as timeliness, safety, simple structure, and strong adaptability.

[0030] Furthermore, the external detection unit is equipped with a vacuum suction cup, which allows it to be easily installed on the rearview mirror.

[0031] Furthermore, the worm gear drive technology can improve the reliability of the overall structure, avoid worm gear drive failure, and greatly improve the real-time performance of the entire device. Attached Figure Description

[0032] Figure 1 A schematic diagram of the entire device's installation on the vehicle body;

[0033] Figure 2 This is a schematic diagram showing the installation location of the external detection unit;

[0034] Figure 3 This is a schematic diagram of the entire locking device's operating process;

[0035] Figure 4 This is a schematic diagram of the external detection unit structure according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the cross-sectional structure of the external detection unit according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the disassembled structure of the external detection unit according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the conventional locking structure inside the mounting plate according to an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the emergency locking structure on the outer side of the mounting plate according to an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the drive device for the emergency locking mechanism on the outer side of the mounting plate according to an embodiment of the present invention.

[0041] Figure 10 The diagram shows two working states of the emergency locking mechanism on the outer side of the mounting plate according to an embodiment of the present invention: (a) the car door is open; (b) the car door is closed.

[0042] Figure 11 This is a schematic diagram of the inner structure of the mounting plate according to an embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the outer structure of the mounting plate according to an embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of the overall installation structure according to an embodiment of the present invention;

[0045] Figure 14 This is a schematic diagram of the circuit connection principle of an embodiment of the present invention;

[0046] In the diagram: 100, External detection unit; 1, Vacuum suction cup; 2, Support block; 201, Block threaded hole; 202, Upper cavity of the block; 203, Lower cavity of the block; 3, Bottom support nest; 4, Monitor; 5, Upper pressure ring; 6, Upper pressure plate; 601, In-plate ring; 602, Pressure plate hole; 7, Spring cover; 8, Spring; 9, Tension bolt; 200, Door locking device; 10, Locking ring; 11, Mounting plate; 12, Drive device; 13, First bevel gear; 14, Worm gear; 15, Limiting component; 16, No. 1 latch; 17, First pull rod; 18, Sliding rod; 19, Second pull rod; 20, Rotating rod; 21, Third pull rod; 22, Moving plate; 23, Semi-worm gear structure; 24, No. 2 latch; 25, Drive motor; 300, Main control unit; 26, Central processing unit; 27, Displacement detector; 28, Signal transmitter. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0048] Please see Figures 1-14 The illustrated locking device for preventing door opening and locking includes a door locking device 200, an external detection unit 100 electrically connected to the door locking device 200, and a main control unit 300. The external detection unit 100 and the main control unit 300 employ a wired / wireless connection scheme, while the main control unit 300 and the door locking device 200 are connected via a wired connection. Connecting the external detection unit to the main control unit using wired / wireless technology ensures real-time information transmission, while the wired connection between the main control unit and the door locking device ensures timely and secure locking.

[0049] See Figure 2 When in use, the external detection unit 100 is installed on the rearview mirror. The entire external detection unit should be small enough not to affect the driver's driving vision. It can acquire video of vehicles (including motorcycles, motor vehicles, etc.) approaching from the side and rear of the vehicle in real time when the vehicle is traveling at low speed or even stopped, and transmit it to the main control unit 300 in real time. The external detection unit 100 is set in two sets, which are installed on the rearview mirrors on both sides of the vehicle respectively, and capture the effective driving status within its detection range.

[0050] See Figure 4 and Figure 5The external detection unit 100 includes a vacuum suction cup 1, a support block 2, an upper pressure plate 6, and a monitor 4. The specific structure of the monitor 4 is existing technology and will not be described in detail here. The vacuum suction cup 1 is connected to one side of the support block 2, and the monitor 4 is mounted on the opposite side and connected to the upper pressure plate 6 via a spring cover 7, a spring 8, and a tension bolt 9. The mating structure between the support block 2 and the upper pressure plate 6 corresponds to the external contour of the monitor 4. The monitor 4 is pressed firmly onto the support block 2 by the upper pressure plate 6, and the lens of the monitor 4 extends beyond the upper pressure plate 6. (See reference...) Figure 6 The support block 2 has a hollow structure, with one end being an upper cavity 202 and the other end being a lower cavity 203. Both the upper and lower cavities 202 and 203 have spherical walls. The lower cavity 203 is opposite to the center hole of the vacuum suction cup 1. A bottom support nest 3 is provided inside the upper cavity 202, and the monitor 4 is located inside the bottom support nest 3. An upper pressure ring 5 is fitted around the upper end of the monitor 4. The inner ring 601 of the upper pressure plate 6 is fitted onto the upper pressure ring 5. The upper pressure ring 5 is used to press and fix the monitor 4. The support block 2 has a threaded hole 201, and the upper pressure plate 6 has a pressure plate hole 602. The threaded hole 201 and the pressure plate hole 602 correspond one-to-one. The tension bolt 9 passes through the pressure plate hole 602 and enters the threaded hole 201.

[0051] Specifically, the upper pressure ring 5 is made of rubber, the bottom support 3 is made of Teflon, the bottom support 3 can reduce its rotational resistance after the monitor 4 is released, and the bottom support 3 is connected to the support block 2.

[0052] The door locking device 200, as a supplement to the conventional door lock, can replace the conventional door lock for locking when necessary. Upon receiving a locking command, it will lock the door again once or twice, based on the control of the door lock. (See also...) Figure 8 , Figure 10 and Figure 13 The door locking device 200 includes a mounting plate 11 for installation on the vehicle door. An emergency locking structure is provided on the outer side (or the inner side depending on the actual situation) of the mounting plate 11. The emergency locking structure includes a drive device 12, a worm gear 14, a semi-worm gear structure 23, and a second latch 24. A first bevel gear 13 is connected to the output shaft end of the drive device 12. One end of the worm gear 14 also has a bevel gear. The two bevel gears mesh with each other to achieve the purpose of the drive device 12 driving the worm gear 14 to rotate. The worm gear 14 meshes with the semi-worm gear structure 23. The outer side of the semi-worm gear structure 23 has teeth that cooperate with the worm gear 14. The semi-worm gear structure 23 is an eccentric arc; rotating around a fixed point will actuate the second latch 24 to hook onto the lock ring (i.e., stop block) 10 on the vehicle to close the door. The drive device 12 is signal-connected to the main control unit 300. A conventional vehicle door lock is provided on the inner side (or the outer side depending on the actual situation), which will be described below.

[0053] For details, please refer to Figure 9 The drive unit 12 includes a drive motor 25. The drive motor 25 is fixed to the mounting plate 11 via a motor mounting plate, and a first bevel gear 13 is fixedly mounted on its output end to save space. The drive motor 25 can respond promptly and quickly, thereby driving the latching structure to lock the door.

[0054] For details, please refer to Figure 11 , Figure 12 This is a structural schematic diagram of the mounting plate 11, which can be used to install mechanisms, etc.

[0055] See Figure 3 and Figure 14 The main control unit 300 includes a central processing unit 26, a displacement detector 27, and a signal transmitter 28. The central processing unit 26 is electrically connected to the displacement detector 27 and the signal transmitter 28, and is also electrically connected to the monitor 4. The signal transmitter 28 is also electrically connected to the drive motor 25. The displacement detector 27 is used to process in real time the motion state information of objects captured by the external detection unit 100, i.e., whether objects to the side and rear of the vehicle are moving and their speed. The central processing unit 26 is used to process the video information collected by the monitor 4 and determine dangerous situations. Specifically, it segments the video information to generate a moving object and its driving area. If the speed of the moving object (obtained by the displacement detector 27) reaches a set speed or the driving area of ​​the moving object is within a set danger zone, then danger is considered to exist; otherwise (i.e., no moving object or, although there is a moving object, its driving area is within a set safety zone and its speed is less than the set speed), then no danger is considered to exist. The signal transmitter 28 is used to send information to drive the drive motor 25 based on the judgment result of the central processing unit 26, so that the door locking device 200 locks or releases. Specifically, when the judgment result is that there is danger, the door locking device 200 locks; when the judgment result is that there is no danger, the door locking device 200 releases. The signal transmitter 28 is essentially a Bluetooth communication module. The central processing unit 26 also includes various externally attached components, such as a motherboard and a power supply.

[0056] See Figure 7 and Figure 13The conventional car door lock is an existing car door lock that can be opened and closed via the door handle. The conventional car door lock includes a limiting member 15, a first latch 16, a sliding rod 18, and a rotating rod 20 mounted on the mounting plate 11. The first latch 16 has a groove that mates with the limiting member 15, preventing it from rotating; similarly, the first latch 16 hooks onto the lock ring 10 to lock the car door. A first pull rod 17 is connected to the limiting member 15. The first pull rod 17 is slidably mounted on the mounting plate (11). The limiting member 15 is elastically connected to the mounting plate 11 via a spring, and the first pull rod 17 is rotatably connected to the limiting member 15. The first pull rod 17 connects the outer door handle to the limiting member 15 and rotates the limiting member 15 when the outer door handle is pulled. A second pull rod 19 is connected to one end of the sliding rod 18. The second pull rod 19 connects the inner door handle to the sliding rod 18 and slides the sliding rod 18 when the inner door handle is pulled. The rotating rod 20 has a third pull rod 21 mounted on one end and a movable plate 22 rotatably and slidably mounted on the other end. The third pull rod 21 is used to connect the existing central locking switch device and the rotating rod 20, and rotates the rotating rod 20 under the control of the central locking switch device. The connection methods between the exterior door handle and the first pull rod 17, the interior door handle and the second pull rod 19, and the central locking switch device and the third pull rod 21 are existing technologies and will not be described in detail here.

[0057] This door-opening locking device works by fixing the external detection unit 100 to the vehicle's rearview mirror using a vacuum suction cup 1, loosening the tension bolt 9 to release the position lock of the monitor 4, and rotating the monitor 4 to adjust its lens to the desired detection direction. The monitor 4 captures traffic conditions to the side and rear of the vehicle, including motor vehicles and non-motor vehicles. Furthermore, the monitor 4 transmits the traffic information in real time to the central processing unit 26. The central processing unit 26 determines the speed and area of ​​the vehicles to the side and rear, and makes a hazard assessment. If a risk is deemed present, the signal transmitter 21 drives the drive motor 25 to lock the door, preventing it from opening. The processing algorithm of the central processing unit 26 is existing technology. The central processing unit 26 analyzes video information in real time, segments the video information, and generates driving objects and driving areas. When a driving object is within a dangerous area, the signal transmitter 21 drives the drive motor 25 to move the second latch 24, thereby locking the locking ring 10.

[0058] The vehicle will also be locked when it is within a safe area and its speed exceeds a set speed threshold. In other words, the vehicle will be locked when either its speed or its travel area is reached. This will take effect when the car is stopped, which helps to reduce traffic accidents caused by the driver or passengers opening the door.

[0059] Specifically, the drive motor 25 drives the first bevel gear 13 at the rear end to rotate the worm 14. The rotation of the worm 14 drives the worm wheel 23 meshing with it, and the worm wheel 23 will produce two motion states, such as... Figure 10 As shown, the two states respectively drive the second latch 24 to lock and release the locking ring 10.

[0060] Under normal circumstances, such as when the vehicle is in motion, latch number two is in the released state, and the door is completely locked by latch number one. When the vehicle is traveling at low speed and about to reach zero speed, the external detection unit starts working, and then this type of device starts working. When passengers get off the vehicle, latch number one can be released under the control of the inner handle. If a moving object is observed to be in a dangerous situation to the side and rear, latch number two is forced to lock, and the door is in a closed state. At this time, the inner handle will not be able to open the door. When the main control unit determines that there is no danger signal, it sends a command to the door locking device to release latch number two. At this time, the inner handle can open the door, reducing the danger and improving travel efficiency.

[0061] The above description is merely a preferred embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the invention, should be included within the scope of protection of the invention.

Claims

1. A locking device to prevent door-opening-and-kill, characterized in that, include: External detection unit (100), main control unit (300), door locking device (200) and door lock for connection with door handle; The external detection unit (100) is used to collect video information from the side and rear of the vehicle body and send it to the main control unit (300). The main control unit (300) is used to process the received video information, determine the danger of opening the door, and send corresponding locking or releasing control commands to the door locking device (200) according to the danger of opening the door. The door locking device (200) is used to lock or release the vehicle door according to the received lock or release control command; The door locking device (200) includes a mounting plate (11) and an emergency locking structure disposed on one side of the mounting plate (11); the emergency locking structure includes a drive device (12) and a latching structure; The drive unit (12) receives the locking or releasing control command from the main control unit (300) and drives the latch structure to lock or release the door according to the received control command; the door lock is installed on the other side of the mounting plate (11).

2. The locking device for preventing door opening and locking according to claim 1, characterized in that, The external detection unit (100) includes a support block (2), an upper pressure plate (6), and a monitor (4). The support block (2) is connected to the upper pressure plate (6), and the monitor (4) is pressed onto the support block (2) by the upper pressure plate (6).

3. The locking device for preventing door opening and locking according to claim 2, characterized in that, A vacuum suction cup (1) is connected to the support block (2).

4. The locking device for preventing door opening and locking according to claim 2, characterized in that, The support block (2) is connected to the upper pressure plate (6) by a tension bolt (9).

5. The locking device for preventing door opening and locking according to claim 2, characterized in that, The support block (2) has an upper cavity (202), and a bottom support nest (3) is provided in the upper cavity (202). The monitor (4) is located in the bottom support nest (3). An upper pressure ring (5) is sleeved on the upper end of the monitor (4), and an upper pressure plate (6) is sleeved on the upper pressure ring (5).

6. The locking device for preventing door opening and locking according to claim 1, characterized in that, The locking structure includes a worm (14), a half-worm gear structure (23), and a locking buckle; the output shaft end of the drive device (12) is connected to a first bevel gear (13), and one end of the worm (14) is connected to a second bevel gear, the first bevel gear (13) meshes with the second bevel gear; the worm (14) meshes with the half-worm gear structure (23), and when the half-worm gear structure (23) rotates, it can move the locking buckle to lock or release the door.

7. The locking device for preventing door opening and locking according to claim 1, characterized in that, The main control unit (300) includes a central processing unit (26), a displacement detector (27), and a signal transmitter (28). The displacement detector (27) is used to obtain the speed of the moving object based on the video information collected by the external detection unit (100); The central processing unit (26) is used to process the video information sent by the external detection unit (100) and, in combination with the speed of the moving object obtained by the displacement detector (27), determine the dangerous state of opening the door. The signal transmitter (28) is used to send corresponding locking or releasing control commands to the door locking device (200) according to the dangerous state of opening the door.

8. The locking device for preventing door opening and locking according to claim 1, characterized in that, The process of determining the danger of opening the door is as follows: the video information is segmented to generate the driving object and the driving area of ​​the driving object. If the speed of the driving object reaches a set speed threshold or the driving area of ​​the driving object is within a set danger area, it is considered that there is a danger of opening the door; otherwise, it is considered that there is no danger. Specifically, the step of sending a corresponding locking or releasing control command to the door locking device (200) based on the danger of opening the door is as follows: when it is determined that there is a danger of opening the door, a locking control command is sent to the door locking device (200); when it is determined that there is no danger of opening the door, a releasing control command is sent to the door locking device (200).

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