Air circuit integrated distribution device, bus passenger door air circuit connection system and control method

Abstract

The present invention discloses an air path integrated distribution device, a bus passenger door air path connection system and a control method, and relates to the field of bus air path control technology. The air path integrated distribution device includes an integrated distribution device body, the integrated distribution device body is provided with a cross-shaped air duct and a three-way air duct, the cross-shaped air duct and the three-way air duct are provided separately from each other, the end of the cross-shaped air duct and the end of the three-way air duct are respectively provided with ports connected to the outside world, and one of the ports of the cross-shaped air duct is connected to an external air source. The present invention adopts an air path integrated design mode and designs an air path integrated distribution device, which performs integrated control on multiple three-ways existing in the original air path, reduces the number of air path layout joints, and can take into account convenient maintenance and safety in terms of passenger door air path control, solving the air path layout problem from the air path source end. In addition, a passenger door buffer device is added to solve the safety hazards of passenger door movement and improve passenger safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of bus air circuit control, in particular to an air circuit integrated distribution device, a bus passenger door air circuit connection system and a control method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Passenger doors are essential components for public buses, and their reliability and safety are directly related to the personal safety of passengers. They have always been a key evaluation indicator of bus safety. However, the inventors have discovered that the current common passenger door air connection systems on public buses have at least the following technical problems:

[0004] (1) The existing passenger door air connection system is connected by a tee, such as Figure 1 As shown, four tees are used in the entire gas connection system, which has the problem of too many joints and many potential gas leakage risks;

[0005] (2) In the arrangement where the gas connection system is located at the bottom, it is very inconvenient for personnel to carry out inspection and maintenance, and there is a disadvantage of poor maintenance performance;

[0006] (3) Multiple tee joints have different specifications and laying methods for the cut nylon pipes according to the different installation locations and component functions, making it difficult to centrally plan and place them;

[0007] (4) When the passenger operates the passenger door air circuit emergency device, the passenger door cylinder switches from an airless state to an air-vented state. The pressure difference at both ends of the cylinder is too large, and the cylinder will move rapidly. The passenger door pump mechanism will rotate rapidly, and the passenger may not be able to avoid it. Therefore, it will pose a safety hazard to the passengers and there is a risk of hitting or injuring people. Summary of the Invention

[0008] The purpose of the present invention is to provide an air path integrated distribution device, a bus passenger door air path connection system and a control method. An air path integrated design mode is adopted to design an air path integrated distribution device, which integrates the control of multiple tees existing in the original air path, reduces the number of air path layout joints, and can take into account convenient maintenance and safety in passenger door air path control, solving the air path layout problem from the source of the air path. In addition, a passenger door buffer device is added to solve the safety hazards of passenger door movement, improve occupant safety, and solve the problems in the existing technology.

[0009] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0010] A first aspect of the present invention provides a gas path integrated distribution device.

[0011] The air path integrated distribution device includes an integrated distribution device body, wherein the integrated distribution device body is provided with a cross-shaped air duct and a three-way air duct, the cross-shaped air duct and the three-way air duct are arranged separately from each other, and the ends of the cross-shaped air duct and the ends of the three-way air duct are respectively provided with ports connected to the outside world, and one of the ports of the cross-shaped air duct is connected to an external air source.

[0012] Preferably, a quick-insert straight-through is further included, and the ports of the cross-shaped airway include a first port, a second port, a fourth port and an air inlet port, and the quick-insert straight-through is connected to the air inlet port.

[0013] Preferably, a third port is further provided at the center of the cross-shaped airway.

[0014] Preferably, the ports of the three-way air channel include a first distribution port, a second distribution port and a third distribution port.

[0015] A second aspect of the present invention provides a passenger door air path connection system for a bus.

[0016] An air path connection system for passenger doors of buses comprising the air path integrated distribution device described in the first aspect comprises an instrument panel valve, the air inlet end of the instrument panel valve is connected to the second port of the integrated distribution device via a pipeline, and the air outlet port of the instrument panel valve is connected to the third distribution port of the integrated distribution device; the first distribution port and the second distribution port of the integrated distribution device are respectively connected to the front door air supply pipeline and the middle door air supply pipeline, and the air inlet port of the integrated distribution device is connected to an external air source.

[0017] Preferably, the front door air supply pipeline and the middle door air supply pipeline are connected in sequence to the external emergency valve, the internal emergency valve, the oil-water separator, the low-pressure sensor, the suppression valve assembly, the two-position five-way solenoid valve and the cylinder.

[0018] Preferably, a buffer valve is also provided on the connecting pipeline between the low-pressure sensor and the suppression valve assembly, the buffer valve includes an air inlet, an air inlet chamber is provided on one side of the air inlet, a buffer chamber is provided on the upper part of the air inlet chamber, a small-aperture through-chamber is provided on one side of the air inlet chamber, a large-aperture through-chamber is provided on one side of the small-aperture through-chamber, an air outlet is provided on one side of the large-aperture through-chamber, the buffer chamber is communicated with the large-aperture through-chamber; a partition plate is provided in the large-aperture through-chamber, a buffer air path flow opening and a through-air path flow opening are provided on the partition plate; a spring is provided in the small-aperture through-chamber, a movable plug is provided in the large-aperture through-chamber, a central hole is provided in the center of the movable plug, a baffle corresponding to the position of the central hole is provided on the side of the partition plate close to the movable plug, the size of the baffle is larger than the size of the central hole, and the spring is used to press the movable plug against the baffle to prevent gas from flowing out when the intake pressure is lower than the set value.

[0019] Preferably, the movable plug includes a small-diameter part and a large-diameter part, the small-diameter part can slide along the inner wall of the small-aperture through-chamber, and the large-diameter part can slide along the inner wall of the large-aperture through-chamber; the outer diameter of the small-diameter part is adapted to the inner diameter of the small-aperture through-chamber, and the outer diameter of the large-diameter part is adapted to the inner diameter of the large-aperture through-chamber; the spring is in a compressed state.

[0020] Preferably, the first port, the fourth port and the third port of the integrated distribution device are respectively connected to the overhead shield cylinder, the driver's seat airbag and the air horn through pipelines.

[0021] The third invention of the present invention provides a bus passenger door air path control method.

[0022] A method for controlling the air path of a passenger door of a bus based on the air path integrated distribution device of the first aspect comprises the following steps:

[0023] The quick-connect is connected to the external gas source, and the gas enters the cross-shaped airway through the air inlet port of the integrated distribution device;

[0024] The gas passes through the second port of the cross-shaped airway and enters the instrument panel valve;

[0025] The gas coming out of the instrument panel valve enters the three-way air channel through the third distribution port;

[0026] The gas in the three-way air duct reaches the front door air supply pipeline through the first distribution port to control the opening and closing of the front door. The gas in the three-way air duct reaches the middle door air supply pipeline through the second distribution port to control the opening and closing of the middle door.

[0027] The gas in the cross-shaped air passage passes through the first port, the fourth port and the third port to control the overhead shield cylinder, the driver's seat airbag and the air horn respectively.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention provides an integrated air distribution device, a passenger door air connection system, and a control method for buses. The three-way connectors originally located at various functional positions are integrated into an air distribution system, which saves four three-way connectors in the passenger door auxiliary pipeline, thus saving costs. The designed integrated distribution device has basic air distribution functions, including receiving, guiding, and outputting. After the air flows out of the air path and returns through the air path components, it can be further redistributed, completing the functional isolation of the unified interface. The original multiple ordinary three-way passages are effectively distributed, realizing functional integration, and completely solving the scattered layout mode.

[0030] 2. The present invention solves the hidden danger of air leakage in multiple tees while reducing the number of joints in the air path. It can also take into account both convenient maintenance and safety in passenger door air path control, solving the problem of air path maintenance from the source of the air path.

[0031] 3. The integrated distribution device of the present invention can be arranged for different gas paths through a dedicated plug, cope with various interface forms, and achieve a universal level of demand.

[0032] 4. The present invention also adds a passenger door buffer valve to effectively buffer the high pressure of the passenger door air path during instantaneous air supply. During the process of gas pressure change, the valve interface is changed by the spring, thereby solving the safety hazards of passenger door movement and improving occupant safety.

[0033] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 Schematic diagram of the passenger door air circuit connection system in the prior art;

[0036] Figure 2 This is a schematic diagram of the internal structure of the integrated distribution device of the present invention;

[0037] Figure 3 This is a schematic diagram of the passenger door air circuit connection system of the present invention;

[0038] Figure 4 For attachment Figure 3 A schematic diagram of the structure at center A;

[0039] Figure 5 It is a schematic diagram of the structure of the buffer valve of the present invention.

[0040] In the accompanying drawings, the components represented by the reference numerals are as follows: 1 integrated distribution device body, 2 cross-shaped air duct, 3 three-way air duct, 4 first port, 5 second port, 6 third port, 7 fourth port, 8 air intake port, 9 first distribution port, 10 second distribution port, 11 third distribution port, 12 instrument panel valve, 13 front door air supply line, 14 middle door air supply line, 15 external emergency valve, 16 internal emergency valve, 17 oil-water separator, 18 Low-pressure sensor, 19 suppression valve assembly, 20 two-position five-way solenoid valve, 21 cylinder, 22 buffer valve, 23 air inlet, 24 air inlet chamber, 25 buffer chamber, 26 small-aperture through-chamber, 27 large-aperture through-chamber, 28 air outlet, 29 partition plate, 30 spring, 31 movable plug, 32 baffle, 33 small-diameter part, 34 large-diameter part, 35 overhead guard cylinder, 36 driver's seat airbag, 37 air horn, 38 quick-insert straight-through. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example 1:

[0043] See also Figure 2 As shown, the present invention is an air path integrated distribution device, including an integrated distribution device body 1, the integrated distribution device body 1 is provided with a cross-shaped air duct 2 and a three-way air duct 3, the cross-shaped air duct 2 and the three-way air duct 3 are separated from each other, and the ends of the cross-shaped air duct 2 and the ends of the three-way air duct 3 are respectively provided with ports connected to the outside world, and one of the ports of the cross-shaped air duct 2 is connected to an external air source.

[0044] In order to integrate the functions of the three-way air duct 3, the integrated distribution device body 1 is provided with the three-way air duct 3; in order to enable the integrated distribution device body 1 to be able to connect a sufficient number of external devices, the integrated distribution device body 1 of this embodiment is provided with a cross-shaped air duct 2; the cross-shaped air duct 2 and the three-way air duct 3 are arranged separately from each other, and the two do not interfere with each other, thereby realizing functional isolation of the cross-shaped air duct 2 and the three-way air duct 3.

[0045] To provide the integrated distribution device of this embodiment with air path receiving functionality, a port for communication with the outside world is provided at the end of the cross-shaped airway 2. In this embodiment, for ease of distinction and description, the ports at the end of the cross-shaped airway 2 are defined as a first port 4, a second port 5, a fourth port 7, and an air inlet port 8. A third port 6 is also provided at the center of the cross-shaped airway 2. The ports of the three-way airway 3 include a first distribution port 9, a second distribution port 10, and a third distribution port 11. A quick-connect connector is connected to the air inlet port 8, directly connecting it to an external air source to achieve air supply.

[0046] The integrated distribution device is equipped with a special plug, which can be used for different gas line layouts and various interface forms to achieve a universal level of demand.

[0047] In terms of maintainability, the integrated distribution device of this embodiment avoids the difficult problem of air leakage maintenance that is easy to occur in existing air circuits. By opening the front maintenance door of the vehicle, problems can be quickly checked and repaired within a reachable range; the three-way joints originally arranged at various functional positions are designed for air circuit integration, so that four three-way joints can be saved in the passenger door auxiliary pipeline, saving costs; the designed integrated distribution device has basic air circuit receiving, guiding, and output functions. After flowing out of the air circuit and returning through the air circuit components, it can be further redistributed, completing the functional isolation of the unified interface, and effectively distributing the original multiple ordinary three-way passages to achieve functional integration, completely solving the scattered layout mode, and realizing integrated pipeline control.

[0048] Example 2:

[0049] See also Figure 3-Figure 5 As shown, this embodiment discloses a passenger door air path connection system for a bus including the air path integrated distribution device of embodiment one, including an instrument panel valve 12, the air inlet end of the instrument panel valve 12 is connected to the second port 5 of the integrated distribution device through a pipeline, the air outlet port of the instrument panel valve 12 is connected to the third distribution port 11 of the integrated distribution device, the first distribution port 9 and the second distribution port 10 of the integrated distribution device are respectively connected to the front door air supply pipeline 13 and the middle door air supply pipeline 14, and the air inlet port 8 of the integrated distribution device is connected to an external air source.

[0050] In this way, the instrument panel valve 12 is connected in series between the cross-shaped air duct 2 and the three-way air duct 3, and the instrument panel valve 12 is used to control the front door air supply pipeline 13 and the middle door air supply pipeline 14. The other ports of the cross-shaped air duct 2 are connected to external devices. Specifically, the first port 4, the fourth port 7 and the third port 6 of the integrated distribution device are respectively connected to the top guard cylinder 35, the driver's seat airbag 36 and the air horn 37 through pipelines.

[0051] In order to achieve the control of the air supply to the front door and the middle door, the front door air supply pipeline 13 and the middle door air supply pipeline 14 are connected in sequence with the external emergency valve 15, the internal emergency valve 16, the oil-water separator 17, the low-pressure sensor 18, the suppression valve assembly 19, the two-position five-way solenoid valve 20 and the cylinder 21.

[0052] On the other hand, this embodiment improves the hidden dangers of collision and injury caused by the passenger door cylinder 21 switching from an airless state to an air-vented state in the prior art, which results in excessive pressure difference at both ends of the cylinder 21 and rapid movement. The passenger door pump mechanism rotates rapidly, and passengers may not be able to avoid it. A buffer valve 22 is provided on the connecting pipeline between the low-pressure sensor 18 and the suppression valve assembly 19, and the structure of the buffer valve 22 is designed.

[0053] The overall design concept of the buffer valve 22 is: when the pressure of the gas supply is lower than a certain characteristic value, the buffer chamber 25 with a small aperture is used for ventilation to achieve slow gas flow. Figure 5 The movable plug 31 and the baffle 32 are in a closed state, and the gas in the main gas path, that is, the small-aperture through-chamber 26 and the large-aperture through-chamber 27, does not flow. Figure 5 The M buffer gas path in the middle flows, achieving the function of slow gas supply; when the pressure of the gas supply increases to a certain extent, which is greater than the pressure of the spring 30 of the buffer valve 22, the gas in the small-aperture through-chamber 26 and the large-aperture through-chamber 27 is completely connected, Figure 5 The movable plug 31 and the baffle 32 are in an open state. Figure 5 The N through-air route in the valve circulates to supply air pressure to the door pump.

[0054] Specifically, the buffer valve 22 includes an air inlet 23, an air inlet chamber 24 is provided on one side of the air inlet 23, a buffer chamber 25 is provided on the upper part of the air inlet chamber 24, a small-aperture through-chamber 26 is provided on one side of the air inlet chamber 24, a large-aperture through-chamber 27 is provided on one side of the small-aperture through-chamber 26, an air outlet 28 is provided on one side of the large-aperture through-chamber 27, and the buffer chamber 25 is communicated with the large-aperture through-chamber 27.

[0055] A partition plate 29 is provided in the large-aperture through-chamber 27, and a buffer gas path flow opening and a through-gas path flow opening are provided on the partition plate 29; a spring 30 is provided in the small-aperture through-chamber 26, and a movable plug 31 is provided in the large-aperture through-chamber 27, one end of the spring 30 is fixedly connected to the inner wall of the small-aperture through-chamber 26, and the other end of the spring 30 is fixedly connected to the movable plug 31, and a central hole is provided in the center of the movable plug 31 for gas to flow through; a baffle 32 corresponding to the position of the central hole is provided on the side of the partition plate 29 close to the movable plug 31, and the size of the baffle 32 is larger than the size of the central hole, thereby achieving the blocking of the central hole; the spring 30 is used to press the movable plug 31 against the baffle 32 to prevent the gas from flowing out when the intake pressure is lower than the set value, so that when the intake pressure is lower than the set value, the N through-gas route is closed, and the M through-gas route is opened, and gas flows through the M through-gas route.

[0056] The movable plug 31 includes a small-diameter part 33 and a large-diameter part 34. The small-diameter part 33 can slide along the inner wall of the small-diameter through-chamber 26, and the large-diameter part 34 can slide along the inner wall of the large-diameter through-chamber 27; the outer diameter of the small-diameter part 33 is adapted to the inner diameter of the small-diameter through-chamber 26, and the outer diameter of the large-diameter part 34 is adapted to the inner diameter of the large-diameter through-chamber 27; the spring 30 is in a compressed state.

[0057] As the gas supply pressure gradually increases, reaching a value greater than the pressure of spring 30, small-diameter portion 33 of movable plug 31 slides into small-aperture through-chamber 26. Large-diameter portion 34 simultaneously slides along the inner wall of large-aperture through-chamber 27. This creates a certain distance between the end face of large-diameter portion 34 near baffle 32 and baffle 32, allowing gas to flow out through the central hole and simultaneously opening the N through-chamber. The N channel opens only when the pressure at the left large end face exceeds the sum of the pressure at the right small end face and the spring pressure.

[0058] like Figure 3-Figure 5 As shown, the air source first enters the integrated distribution device body 1 through the air inlet port 8, then connects to the air inlet of the instrument panel valve 12 through the second port 5. The air outlet of the instrument panel valve 12 is connected to the third distribution port 11 of the integrated distribution device body 1. Here, a variety of air distribution paths can be achieved by combining different plugs or connectors. One path connects to the external emergency valve 15 and the internal emergency valve 16 through the first distribution port 9, passes through the oil-water separator 17, and enters the buffer valve 22 through the low-pressure sensor 18. It then passes through the suppression valve assembly 19 and enters the two-position five-way solenoid valve 20. It is then distributed to the air inlet and outlet of the cylinder 21, realizing the door opening and closing action.

[0059] Among them, when the air pressure is relatively low, the buffer valve 22 ensures normal air flow through the M through-air route. When the air pressure difference between the two ends is relatively large, the M through-air route and the N through-air route are involved.

[0060] Example 3:

[0061] This embodiment discloses a passenger door air path control method for a bus based on the air path integrated distribution device of embodiment 1, comprising the following steps:

[0062] The quick-connect is connected to the external gas source, and the gas enters the cross-shaped air channel 2 through the air inlet port 8 of the integrated distribution device;

[0063] The gas passes through the second port 5 of the cross-shaped air channel 2 and enters the instrument panel valve 12;

[0064] The gas coming out of the instrument panel valve 12 enters the three-way air channel 3 through the third distribution port 11;

[0065] The gas in the three-way air channel 3 reaches the front door air supply pipeline 13 through the first distribution port 9 to control the opening and closing of the front door. The gas in the three-way air channel 3 reaches the middle door air supply pipeline 14 through the second distribution port 10 to control the opening and closing of the middle door.

[0066] The gas in the cross-shaped air passage 2 passes through the first port 4 , the fourth port 7 and the third port 6 to control the overhead shield cylinder 35 , the driver's seat airbag 36 and the air horn 37 respectively.

[0067] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0068] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A passenger door air connection system for a bus, characterized in that: It includes an instrument panel valve and an integrated air distribution device; the integrated air distribution device includes an integrated distribution device body, which is provided with a cross-shaped air channel and a three-way air channel, the cross-shaped air channel and the three-way air channel are provided separately from each other, and the ends of the cross-shaped air channel and the ends of the three-way air channel are respectively provided with ports communicating with the outside world; the ports of the cross-shaped air channel include a first port, a second port, a fourth port and an air inlet port, one of which is connected to an external air source, and a third port is further provided at the center of the cross-shaped air channel; the ports of the three-way air channel include a first distribution port, a second distribution port and a third distribution port; The air inlet end of the instrument panel valve is connected to the second port of the integrated distribution device through a pipeline, and the air outlet end of the instrument panel valve is connected to the third distribution port of the integrated distribution device; the first distribution port and the second distribution port of the integrated distribution device are connected to the front door air supply pipeline and the middle door air supply pipeline respectively, and the air inlet end of the cross-shaped air channel of the integrated distribution device is connected to the external air source; The front door air supply pipeline and the middle door air supply pipeline are connected in sequence with an external emergency valve, an internal emergency valve, an oil-water separator, a low-pressure sensor, a suppression valve assembly, a two-position five-way solenoid valve and a cylinder. A buffer valve is also provided on the connecting pipeline between the low-pressure sensor and the suppression valve assembly. The buffer valve includes an air inlet, an air inlet chamber is provided on one side of the air inlet, and a buffer chamber is provided on the upper part of the air inlet chamber; a small-aperture through-chamber is provided on one side of the air inlet chamber, a large-aperture through-chamber is provided on one side of the small-aperture through-chamber, and an air outlet is provided on one side of the large-aperture through-chamber. The buffer chamber is connected with the large-aperture through-chamber; a partition plate is provided in the large-aperture through-chamber, and a buffer gas flow opening and a through-gas flow opening are provided on the partition plate; a spring is provided in the small-aperture through-chamber, and a movable plug is provided in the large-aperture through-chamber, and a central hole is provided in the center of the movable plug; a baffle corresponding to the position of the central hole is provided on the side of the partition plate close to the movable plug, and the size of the baffle is larger than the size of the central hole, and the spring is used to press the movable plug against the baffle to prevent gas from flowing out when the intake pressure is lower than the set value.

2. A passenger door air circuit connection system for a bus according to claim 1, characterized in that: The air path integrated distribution device includes a quick-insert straight-through, which is connected to the air inlet port of the cross-shaped air duct.

3. The passenger door air circuit connection system for a bus according to claim 1, characterized in that: The movable plug includes a small-diameter part and a large-diameter part, the small-diameter part can slide along the inner wall of the small-diameter through-chamber, and the large-diameter part can slide along the inner wall of the large-diameter through-chamber; the outer diameter of the small-diameter part is adapted to the inner diameter of the small-diameter through-chamber, and the outer diameter of the large-diameter part is adapted to the inner diameter of the large-diameter through-chamber; the spring is in a compressed state.

4. The passenger door air circuit connection system for a bus according to claim 1, characterized in that: The first port, the fourth port and the third port of the integrated distribution device are respectively connected to the top shield cylinder, the driver's seat airbag and the air horn through pipelines.

5. A passenger car passenger door air path control method based on the passenger car passenger door air path connection system according to any one of claims 1 to 4, characterized in that: The following steps are involved: The quick-connect is connected to the external gas source, and the gas enters the cross-shaped airway through the air inlet port of the integrated distribution device; The gas passes through the second port of the cross-shaped airway and enters the instrument panel valve; The gas coming out of the instrument panel valve enters the three-way air channel through the third distribution port; The gas in the three-way air duct reaches the front door air supply pipeline through the first distribution port to control the opening and closing of the front door. The gas in the three-way air duct reaches the middle door air supply pipeline through the second distribution port to control the opening and closing of the middle door. The gas in the cross-shaped air passage passes through the first port, the fourth port and the third port to control the overhead shield cylinder, the driver's seat airbag and the air horn respectively.

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