Aircraft cargo hold smoke detection system and aircraft

Abstract

The invention relates to an aircraft cargo hold smoke detection system and an aircraft. The smoke detection system for the airplane cargo hold comprises a smoke detector and a controller, when the cargo hold door is in a closed state, if the smoke detector detects smoke, the smoke detector transmits a smoke alarm signal to the cockpit through the controller, and if the smoke detector does not detect smoke, the airplane cargo hold smoke detection system continues to monitor the state of the cargo hold; in the opening state of the cargo hold door, if the smoke detector detects smoke and if the smoke alarm signal is not suppressed, the smoke detector transmits the signal to the cockpit through the controller, and if the signal is suppressed, the airplane cargo hold smoke detection system continues to monitor the state of the cargo hold; when the cargo hold door is in an open state, if the smoke detector does not detect smoke and if the smoke manual alarm signal is triggered, the signal is transmitted to the cockpit through the controller, and if the signal is not triggered, the airplane cargo hold smoke detection system continues to monitor the cargo hold state.

Description

Technical Field

[0001] This invention relates to the field of aircraft fire protection systems, and more particularly to an aircraft cargo hold smoke detection system. Background Technology

[0002] In the past, aircraft cargo hold fire protection systems were typically equipped with smoke detection systems and Halon 1301 fire suppression systems. However, due to the ozone-depleting effects of Halon 1301 fire extinguishing agent, both EASA (European Aviation Safety Agency) and CAAC (Civil Aviation Administration of China) have issued timelines to prohibit the use of Halon 1301 fire suppression systems in cargo holds, requiring that aircraft applying for Type Certificates (TCs) after 2018 be prohibited from using Halon 1301 fire suppression systems in their cargo holds.

[0003] Currently available alternatives to Halon 1301 fire extinguishing agent (such as CF3I, CO2, BLEND D, etc.) have effective concentrations higher than its non-toxic and low-toxicity levels. This means that the concentration of fire extinguishing agent used to extinguish fires in cargo holds is toxic and harmful to personnel inside the cargo hold. Summary of the Invention

[0004] One objective of this invention is to provide an aircraft cargo hold smoke detection system that can prevent injury to personnel inside the cargo hold when extinguishing fires with fire extinguishing agents, reduce the false alarm rate of cargo hold fire alarms, and improve the system alarm efficiency.

[0005] The above-mentioned objectives of the present invention are achieved by an aircraft cargo hold smoke detection system, which includes a smoke detector and a controller. The smoke detector is installed in the cargo hold, and the controller is connected to the smoke detector and connected to the cockpit. The controller is also configured to receive cargo hold door opening / closing signals. When the cargo door is closed, the controller receives a cargo door closing signal. If the smoke detector detects smoke, it transmits a smoke alarm signal to the cockpit through the controller so that the pilot can perform cargo compartment fire extinguishing operations. If the smoke detector does not detect smoke, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector detects smoke and the smoke alarm signal is not suppressed, the smoke detector transmits the smoke alarm signal to the cockpit through the controller so that the pilot can carry out cargo compartment fire extinguishing operations. If the smoke alarm signal is suppressed, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector does not detect smoke, and if a manual smoke alarm signal is triggered, the manual smoke alarm signal is transmitted to the cockpit through the controller so that the pilot can carry out cargo hold fire extinguishing operations. If the manual smoke alarm signal is not triggered, the aircraft cargo hold smoke detection system continues to monitor the cargo hold status.

[0006] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: it can avoid injury to personnel in the cargo hold when fire extinguishing agents are used to extinguish fires, and it can also reduce the false alarm rate of cargo hold fire alarms and improve the alarm efficiency of the system.

[0007] Preferably, the aircraft cargo hold smoke detection system further includes a smoke alarm suppression switch and a smoke alarm trigger switch. When the smoke alarm suppression switch is pressed, the smoke alarm signal is suppressed, and when the smoke alarm trigger switch is pressed, the manual smoke alarm signal is triggered.

[0008] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by appropriately setting smoke alarm suppression switch and smoke alarm trigger switch, the personnel in the cargo hold can suppress the smoke alarm signal when necessary, reduce the false alarm rate of cargo hold fire alarm, and trigger the manual smoke alarm signal when necessary, thereby improving the system alarm efficiency.

[0009] Preferably, the smoke alarm suppression switch and the smoke alarm trigger switch are disposed on the smoke detector.

[0010] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by setting the appropriate positions of the smoke alarm suppression switch and the smoke alarm triggering switch, it is easier for the staff in the cargo hold to suppress the smoke alarm signal or trigger the manual smoke alarm signal when necessary, and can isolate the smoke detector that gives a false alarm in a timely manner.

[0011] Preferably, the smoke alarm suppression switch and the smoke alarm trigger switch are located at or near the cargo door.

[0012] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by setting the smoke alarm suppression switch and the smoke alarm triggering switch in another suitable location, it is more convenient for the personnel in the cargo hold to suppress the smoke alarm signal or trigger the manual smoke alarm signal when necessary.

[0013] Preferably, the smoke alarm suppression switch and the smoke alarm trigger switch are integrated into a single switch, namely a smoke alarm suppression / trigger switch. When the smoke alarm suppression / trigger switch is pressed briefly, the smoke alarm signal is suppressed. When the smoke alarm suppression / trigger switch is pressed for a long time, the smoke alarm signal is triggered.

[0014] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: it simplifies the structural design of the smoke alarm suppression / trigger switch and reduces the possibility of personnel in the cargo hold accidentally touching the switch.

[0015] Preferably, there are multiple smoke detectors, which are installed in corresponding locations within the cargo hold.

[0016] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: improve the system alarm efficiency, and can promptly send the alarmed smoke detector information to the cockpit or instruct the personnel in the cargo hold, thus realizing smoke location indication.

[0017] Preferably, the smoke detector includes a smoke alarm indicator light and / or a smoke alarm speaker.

[0018] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: when the smoke detector detects smoke, it can issue an effective smoke alarm instruction to the personnel in the cargo hold through the smoke alarm indicator light and / or smoke alarm speaker.

[0019] Preferably, the controller has a preset countdown time value. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector detects smoke, the controller starts a countdown. If the smoke alarm signal is not suppressed when the first countdown time value is reached, the smoke detector transmits the smoke alarm signal to the cockpit through the controller so that the pilot can perform cargo hold fire suppression operations. If the smoke alarm signal is suppressed during the first countdown time value, the aircraft cargo hold smoke detection system continues to monitor the cargo hold status.

[0020] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by presetting a first countdown time value in the controller, the personnel in the cargo hold can have a certain amount of time to evacuate the cargo hold when a fire alarm occurs (at which time the smoke detector will automatically alarm), so as to avoid injury to the personnel in the cargo hold when the fire extinguishing agent is used to extinguish the fire, and also allow the personnel in the cargo hold a certain amount of time to check whether there is a false alarm, thereby reducing the false alarm rate of the cargo hold fire alarm.

[0021] Preferably, the controller has a preset second countdown time value. When the cargo door is open, the controller receives the cargo door open signal. If the smoke detector does not detect smoke, and if the manual smoke alarm signal is triggered, the controller starts a countdown after the manual smoke alarm signal is triggered. When the second countdown time value is reached, the manual smoke alarm signal is transmitted to the cockpit through the controller so that the pilot can carry out cargo compartment fire extinguishing operations.

[0022] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by presetting a second countdown time value in the controller, the personnel in the cargo hold can have a certain amount of time to evacuate the cargo hold when a fire alarm occurs (at this time, the personnel in the cargo hold will manually raise the alarm, rather than the smoke detector will automatically raise the alarm), so as to avoid injury to the personnel in the cargo hold when the fire extinguishing agent is used to extinguish the fire.

[0023] The above-mentioned objectives of the present invention are also achieved by an aircraft comprising an aircraft cargo hold smoke detection system as described in any of the above aspects.

[0024] According to the above technical solution, the aircraft of the present invention can achieve the following beneficial technical effects: it can avoid injury to personnel in the cargo hold when extinguishing fire with fire extinguishing agents, and can also reduce the false alarm rate of cargo hold fire alarms and improve the system alarm efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the architecture of an aircraft cargo hold smoke detection system according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of a smoke detector in an aircraft cargo hold smoke detection system according to an embodiment of the present invention.

[0027] Figure 3 This is a flowchart illustrating the operation of an aircraft cargo hold smoke detection system according to an embodiment of the present invention.

[0028] List of reference numerals

[0029] 1: Smoke detector; 2: Controller; 3: Cockpit; 11: Smoke alarm indicator light; 12: Smoke alarm suppression / trigger switch; 13: Smoke detection unit; 14: Smoke alarm speaker. Detailed Implementation

[0030] The following describes specific embodiments of the present invention. It should be noted that, in order to provide a concise description, this specification cannot exhaustively describe all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, just as in any engineering or design project, various specific decisions are often made to achieve the developer's specific goals and to meet system-related or business-related constraints, and this can change from one embodiment to another. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, some design, manufacturing, or production modifications based on the technical content disclosed herein are merely conventional technical means and should not be construed as insufficient content of this disclosure.

[0031] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the patent application description and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0032] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0033] Figure 1 This is a schematic diagram of the architecture of an aircraft cargo hold smoke detection system according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a smoke detector in an aircraft cargo hold smoke detection system according to an embodiment of the present invention. Figure 3 This is a flowchart illustrating the operation of an aircraft cargo hold smoke detection system according to an embodiment of the present invention.

[0034] like Figures 1 to 3As shown, an embodiment of the aircraft cargo hold smoke detection system of the present invention includes a smoke detector 1 and a controller 2. The smoke detector 1 is installed in the cargo hold, and the controller 2 is connected to the smoke detector 1 (e.g., signal connection) and connected to the cockpit 3 (e.g., signal connection). The controller 2 is also configured to receive cargo hold door opening / closing signals. When the cargo door is closed, controller 2 receives a cargo door closed signal. If smoke detector 1 detects smoke, smoke detector 1 will transmit a smoke alarm signal (also known as an automatic smoke alarm signal, to distinguish it from the manual smoke alarm signal mentioned below) to cockpit 3 through controller 2 so that the pilot can carry out cargo compartment fire extinguishing operations. If smoke detector 1 does not detect smoke, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, controller 2 receives the cargo door open signal. If smoke detector 1 detects smoke and the smoke alarm signal (also known as the automatic smoke alarm signal, to distinguish it from the manual smoke alarm signal mentioned below) is not suppressed, smoke detector 1 transmits the smoke alarm signal to cockpit 3 through controller 2 so that the pilot can carry out cargo compartment fire extinguishing operations. If the smoke alarm signal is suppressed, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, controller 2 receives the cargo door open signal. If smoke detector 1 does not detect smoke, and if a manual smoke alarm signal is triggered, the manual smoke alarm signal is transmitted to cockpit 3 through controller 2 so that the pilot can carry out cargo compartment fire extinguishing operations. If the manual smoke alarm signal is not triggered, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status.

[0035] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: it can avoid injury to personnel in the cargo hold when fire extinguishing agents are used to extinguish fires, and it can also reduce the false alarm rate of cargo hold fire alarms and improve the alarm efficiency of the system.

[0036] Specifically, a closed cargo hold door usually means there are no personnel inside, while an open cargo hold door usually means there are personnel inside. This application focuses particularly on the scenario where the cargo hold door is open (i.e., there are personnel inside). In this case, if a smoke detector issues a smoke alarm, and the personnel inside the cargo hold check and find that there is actually no smoke or fire around the alarmed smoke detector, the smoke alarm signal can be suppressed to avoid false alarms in the cargo hold and reduce the false alarm rate in cargo hold fires. If the smoke detectors do not detect smoke, but the cargo hold crew discovers smoke or a fire, they can trigger a manual smoke alarm signal. This signal is then transmitted to the cockpit via the controller, allowing the crew to evacuate the cargo hold in time so the pilots can begin firefighting operations. Therefore, even if some smoke detectors fail or do not detect smoke in time, the cargo hold crew can still trigger a manual smoke alarm signal, improving the system's alarm speed and efficiency.

[0037] The phrase "aircraft cargo hold smoke detection system monitoring cargo hold status" mentioned above refers to the aircraft cargo hold smoke detection system monitoring the open / closed status of the cargo hold doors, whether the smoke detectors detect smoke, whether the smoke alarm signal (automatic smoke alarm signal) is suppressed, whether the manual smoke alarm signal is triggered, and so on.

[0038] Ideally, the suppression of the smoke alarm signal means that the aircraft cargo hold smoke detection system will generate an alarm suppression signal. Once the controller receives the alarm suppression signal, the smoke alarm signal will no longer be transmitted to the cockpit through the controller.

[0039] In some embodiments, such as Figures 1 to 2 As shown, the aircraft cargo hold smoke detection system also includes a smoke alarm suppression switch and a smoke alarm trigger switch. When the smoke alarm suppression switch is pressed, the smoke alarm signal is suppressed, and when the smoke alarm trigger switch is pressed, the manual smoke alarm signal is triggered.

[0040] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by appropriately setting smoke alarm suppression switch and smoke alarm trigger switch, the personnel in the cargo hold can suppress the smoke alarm signal when necessary, reduce the false alarm rate of cargo hold fire alarm, and trigger the manual smoke alarm signal when necessary, thereby improving the system alarm efficiency.

[0041] In some embodiments, such as Figures 1 to 2 As shown, the smoke alarm suppression switch and the smoke alarm trigger switch are installed on the smoke detector 1.

[0042] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by setting the appropriate positions of the smoke alarm suppression switch and the smoke alarm triggering switch, it is easier for the staff in the cargo hold to suppress the smoke alarm signal or trigger the manual smoke alarm signal when necessary, and can isolate the smoke detector that gives a false alarm in a timely manner.

[0043] In some embodiments, the smoke alarm suppression switch and the smoke alarm trigger switch are located at or near the cargo door.

[0044] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by setting the smoke alarm suppression switch and the smoke alarm triggering switch in another suitable location, it is more convenient for the personnel in the cargo hold to suppress the smoke alarm signal or trigger the manual smoke alarm signal when necessary.

[0045] In some embodiments, such as Figures 1 to 2 As shown, the smoke alarm suppression switch and the smoke alarm trigger switch are integrated into the same switch, namely the smoke alarm suppression / trigger switch 12. When the smoke alarm suppression / trigger switch 12 is pressed briefly (e.g., pressed for less than 3 seconds), the smoke alarm signal is suppressed. When the smoke alarm suppression / trigger switch 12 is pressed for a long time (e.g., pressed for more than 3 seconds), the smoke alarm signal is triggered.

[0046] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: it simplifies the structural design of the smoke alarm suppression / trigger switch and reduces the possibility of personnel in the cargo hold accidentally touching the switch.

[0047] Of course, those skilled in the art will understand, based on the disclosure of this application, that the smoke alarm suppression switch and the smoke alarm trigger switch can also be set separately, which also falls within the protection scope of this application.

[0048] In some embodiments, the number of smoke detectors 1 is multiple, and the multiple smoke detectors 1 are arranged in corresponding multiple locations in the cargo hold.

[0049] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: improve the system alarm efficiency, and can promptly send the alarmed smoke detector information to the cockpit or instruct the personnel in the cargo hold, thus realizing smoke location indication.

[0050] In some embodiments, such as Figures 1 to 2 As shown, the smoke detector 1 includes a smoke alarm indicator light 11 and / or a smoke alarm speaker 14.

[0051] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: when the smoke detector detects smoke, it can issue an effective smoke alarm instruction to the personnel in the cargo hold through the smoke alarm indicator light and / or smoke alarm speaker.

[0052] In some embodiments, such as Figures 1 to 2 As shown, the smoke detector 1 also includes a smoke detection unit 13, used to detect the presence of smoke in the cargo hold.

[0053] In some embodiments, such as Figures 1 to 3As shown, controller 2 is preset with a first countdown time value. When the cargo door is open, controller 2 receives the cargo door open signal. If smoke detector 1 detects smoke, controller 2 starts the countdown. If the smoke alarm signal is not suppressed when the first countdown time value is reached, smoke detector 1 transmits the smoke alarm signal to cockpit 3 through controller 2 so that the pilot can carry out cargo compartment fire extinguishing operations. If the smoke alarm signal is suppressed during the first countdown time value, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status.

[0054] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by presetting a first countdown time value in the controller, the personnel in the cargo hold can have a certain amount of time to evacuate the cargo hold when a fire alarm occurs (at which time the smoke detector will automatically alarm), so as to avoid injury to the personnel in the cargo hold when the fire extinguishing agent is used to extinguish the fire, and also allow the personnel in the cargo hold a certain amount of time to check whether there is a false alarm, thereby reducing the false alarm rate of the cargo hold fire alarm.

[0055] Ideally, the first countdown time is 5 seconds.

[0056] Preferably, when the cargo hold door is open, after smoke detector 1 detects smoke, the system will flash the smoke alarm indicator 11 and sound an alarm through the smoke alarm speaker 14 to alert the personnel inside the cargo hold. Simultaneously, controller 2 will start a 5-second countdown. During this time, the personnel inside the cargo hold can visually check whether there is smoke or fire around the smoke detector where the smoke alarm indicator is flashing / smoke alarm speaker is sounding. If there is no smoke or fire, the personnel can press the smoke alarm suppression switch to suppress the cargo hold smoke alarm signal to avoid a false alarm. After receiving the alarm suppression signal, controller 2 will determine that the previous smoke alarm was a false alarm, determine that the smoke detector that previously issued the alarm is faulty, and isolate the detector. The system will continue to monitor the cargo hold status. If the personnel confirm that there is smoke or fire, they can evacuate the cargo hold and close the cargo hold door before the countdown ends to provide a good fire-fighting environment. At this time, the smoke alarm signal is not suppressed and will be transmitted to the cockpit 3 through controller 2, and the pilot will carry out cargo hold fire-fighting operations.

[0057] In some embodiments, such as Figures 1 to 3 As shown, controller 2 has a preset second countdown time value. When the cargo door is open, controller 2 receives the cargo door open signal. If smoke detector 1 does not detect smoke, and if the manual smoke alarm signal is triggered, controller 2 starts counting down after the manual smoke alarm signal is triggered. When the second countdown time value is reached, the manual smoke alarm signal is transmitted to the cockpit 3 through controller 2 so that the pilot can carry out cargo compartment fire extinguishing operations.

[0058] According to the above technical solution, the aircraft cargo hold smoke detection system of the present invention can achieve the following beneficial technical effects: by presetting a second countdown time value in the controller, the personnel in the cargo hold can have a certain amount of time to evacuate the cargo hold when a fire alarm occurs (at this time, the personnel in the cargo hold will manually raise the alarm, rather than the smoke detector will automatically raise the alarm), so as to avoid injury to the personnel in the cargo hold when the fire extinguishing agent is used to extinguish the fire.

[0059] Ideally, the second countdown timer should be 5 seconds.

[0060] Preferably, if smoke detector 1 does not detect smoke when the cargo hold door is open, but cargo hold personnel discover smoke or a fire, they can trigger a manual smoke alarm signal by pressing the smoke alarm trigger switch. The signal is then transmitted to controller 2, which simultaneously begins a 5-second countdown. Personnel can evacuate the cargo hold and close the cargo hold door before the countdown ends to provide a suitable environment for firefighting. After the countdown ends, controller 2 transmits the smoke alarm signal to the cockpit 3, where the pilot will initiate firefighting operations in the cargo hold. If smoke detector 1 does not detect smoke and cargo hold personnel do not trigger the manual smoke alarm signal, the system will continue to monitor the cargo hold status.

[0061] The aircraft cargo hold smoke detection system of this application can realize cargo hold smoke alarm, smoke location indication, smoke alarm suppression, and smoke alarm triggering.

[0062] Furthermore, those skilled in the art will understand, based on the disclosure of this application, that the cargo door opening and closing signal can also be replaced with an aircraft wheel-mounted signal, which also falls within the protection scope of this application.

[0063] According to an embodiment of the present invention, the aircraft includes a cargo hold smoke detection system as described in any of the above aspects. Based on the above technical solution, the aircraft of the present invention can achieve the following beneficial technical effects: it can avoid injury to personnel in the cargo hold when extinguishing fires with fire extinguishing agents, reduce the false alarm rate of cargo hold fire alarms, and improve the system alarm efficiency.

[0064] The specific embodiments of the present invention have been described above. However, those skilled in the art will understand that the above specific embodiments do not constitute a limitation on the present invention. Those skilled in the art can make various modifications based on the above disclosure without exceeding the scope of the present invention.

Claims

1. An aircraft cargo hold smoke detection system, the aircraft cargo hold smoke detection system comprising a smoke detector and a controller, the smoke detector being disposed in the cargo hold, the controller being connected to the smoke detector and connected to the cockpit, the controller being further configured to receive cargo hold door opening / closing signals; in, When the cargo door is closed, the controller receives a cargo door closed signal. If the smoke detector detects smoke, it transmits a smoke alarm signal to the cockpit through the controller so that the pilot can perform cargo compartment fire extinguishing operations. If the smoke detector does not detect smoke, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector detects smoke and the smoke alarm signal is not suppressed, the smoke detector transmits the smoke alarm signal to the cockpit through the controller so that the pilot can carry out cargo compartment fire extinguishing operations. If the smoke alarm signal is suppressed, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector does not detect smoke, and if a manual smoke alarm signal is triggered, the manual smoke alarm signal is transmitted to the cockpit through the controller so that the pilot can carry out cargo compartment fire extinguishing operations. If the manual smoke alarm signal is not triggered, the aircraft cargo compartment smoke detection system continues to monitor the cargo compartment status.

2. The aircraft cargo hold smoke detection system as described in claim 1, characterized in that, The aircraft cargo hold smoke detection system also includes a smoke alarm suppression switch and a smoke alarm trigger switch. When the smoke alarm suppression switch is pressed, the smoke alarm signal is suppressed, and when the smoke alarm trigger switch is pressed, the manual smoke alarm signal is triggered.

3. The aircraft cargo hold smoke detection system as described in claim 2, characterized in that, The smoke alarm suppression switch and the smoke alarm trigger switch are mounted on the smoke detector.

4. The aircraft cargo hold smoke detection system as described in claim 2, characterized in that, The smoke alarm suppression switch and the smoke alarm trigger switch are located at or near the cargo door.

5. The aircraft cargo hold smoke detection system as described in claim 2, characterized in that, The smoke alarm suppression switch and the smoke alarm trigger switch are integrated into one switch, namely the smoke alarm suppression / trigger switch. When the smoke alarm suppression / trigger switch is pressed briefly, the smoke alarm signal is suppressed. When the smoke alarm suppression / trigger switch is pressed for a long time, the smoke alarm signal is triggered.

6. The aircraft cargo hold smoke detection system as described in claim 1, characterized in that, The number of smoke detectors is multiple, and the multiple smoke detectors are installed in corresponding locations within the cargo hold.

7. The aircraft cargo hold smoke detection system as described in claim 1, characterized in that, The smoke detector includes a smoke alarm indicator light and / or a smoke alarm speaker.

8. The aircraft cargo hold smoke detection system as described in claim 1, characterized in that, The controller is preset with a first countdown time value. When the cargo door is open, the controller receives a cargo door open signal. If the smoke detector detects smoke, the controller starts a countdown. If the smoke alarm signal is not suppressed when the first countdown time value is reached, the smoke detector transmits the smoke alarm signal to the cockpit through the controller so that the pilot can perform cargo hold fire extinguishing operations. If the smoke alarm signal is suppressed during the first countdown time value, the aircraft cargo hold smoke detection system continues to monitor the cargo hold status.

9. The aircraft cargo hold smoke detection system as described in claim 1, characterized in that, The controller is preset with a second countdown time value. When the cargo door is open, the controller receives the cargo door open signal. If the smoke detector does not detect smoke, and if the manual smoke alarm signal is triggered, the controller starts counting down after the manual smoke alarm signal is triggered. When the second countdown time value is reached, the manual smoke alarm signal is transmitted to the cockpit through the controller so that the pilot can carry out cargo compartment fire extinguishing operations.

10. An aircraft comprising a cargo hold smoke detection system as claimed in any one of claims 1-9.

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