A logical judgment method for fire detection system

Abstract

This application belongs to the field of aviation design. It is a fire detection system logic judgment method. Two three-diaphragm box pneumatic fire detectors are arranged side by side to form a first fire detector and a second fire detector. The first fire detector and the second fire detector detect the information in the aircraft engine compartment in real time and send it to the fire control box in real time. As long as one of the fire detectors outputs heat and fire signals successively, there is no need to wait for 15 seconds to detect the output status of the other fire detector device. The fire control box directly outputs the fire alarm status to the avionics system. This logic judgment is different from the true and false judgment of the alarm information of the traditional dual-circuit fire detection equipment. It not only truly improves the reliability of the fire detection system, but also effectively shortens the fire detection time.

Description

Technical Field

[0001] The present application belongs to the field of aviation design, and in particular relates to a logic judgment method for a fire detection system. Background Art

[0002] The aircraft engine compartment and APU compartment are the fire zones of the aircraft. The airworthiness regulations require that fire detection devices must be designed in the fire zones of large aircraft to ensure that the fire situation can be reported to the crew cockpit in a timely manner, so that the crew can carry out fire extinguishing and emergency landing procedures in a timely manner. Therefore, the reliability of the engine compartment fire detection system is particularly important. In the past, double-diaphragm box pneumatic fire detectors were mostly used in the fire zones of aircraft models. Two fire detector devices were arranged side by side, and they output three states: fire alarm, fault, and normal. Then the fire control box judged the state signals output by the two fire detector devices and output the alarm signal to the crew. This logic design method can greatly improve the system reliability and reduce the false alarm rate and missed alarm rate of the system. However, since the state of the equipment itself also has the probability of error, the logic judgment design of the fire control box is a trade-off between the true and false output states of the two fire detector devices. Therefore, the fire detection system design is never a true double-redundancy design.

[0003] At present, three-diaphragm pneumatic fire detectors have begun to be used on aircraft. Three-diaphragm pneumatic fire detectors can distinguish between fire alarm and overheating states, and can output five states: overheating and fire alarm, overheating only, fire alarm only, fault, and normal. Therefore, it is very important to carry out scientific and reasonable logical judgment design on the output state of the dual-circuit three-diaphragm pneumatic fire detector equipment to improve system reliability. Summary of the invention

[0004] The purpose of the present application is to provide a fire detection system logic judgment method to solve the problem that the double-diaphragm box fire detector in the prior art is not accurate enough in judging the alarm state.

[0005] The technical solution of the present application is: a fire detection system logic judgment method, comprising: arranging two three-membrane box pneumatic fire detectors side by side to form a first fire detector and a second fire detector, the first fire detector and the second fire detector detect the information in the aircraft engine compartment in real time, and send it to the fire control box in real time; the fire control box first detects the output information of the first fire detector, and then compares the output information of the second fire detector with the first fire detector, performs logic judgment, judges the different states in the aircraft engine compartment according to the different information of the first fire detector and the second fire detector, and outputs the judgment result to send to the avionics alarm system and the health management system.

[0006] Preferably, if the first fire detector circuit outputs overheating and fire alarm status successively, a fire alarm signal is directly outputted without waiting for the control box to detect the status of the second fire detector circuit; as long as the second fire detector circuit does not output overheating and fire alarm status successively, the second fire detector circuit is determined to be faulty, and the fault information of the second fire detector circuit is recorded and isolated.

[0007] Preferably, if the first fire detector circuit only outputs an overheat alarm signal, the fire control box continuously monitors the first fire detector and the second fire detector circuit within 15 seconds. When the first fire detector circuit continues to output only an overheat alarm, if the second fire detector circuit successively outputs an overheat and fire alarm status, the fire control box outputs a fire alarm signal, determines that the first fire detector circuit is faulty, and records and isolates the fault information of the first fire detector circuit; if the second fire detector circuit only outputs an overheat alarm signal, the fire control box outputs an overheat alarm signal; if the second fire detector circuit only outputs a fire alarm status, The fire control box outputs a fire alarm signal, and at the same time determines the first fire detector and the second fire detector circuits to be in a fault state, and records and isolates the fault information of the first fire detector circuit and the second fire detector circuit; if the second fire detector circuit outputs a fault state, the fire control box outputs an overheating alarm signal, and records and isolates the fault information of the second fire detector circuit; if the second fire detector circuit always outputs a normal state, the fire control box does not output a fire alarm, overheating, or fault state, determines that the first fire detector circuit is faulty, and records and isolates the fault information of the first fire detector circuit.

[0008] Preferably, if the first fire detector circuit only outputs a fire alarm signal, the fire control box continuously monitors the first fire detector and the second fire detector circuit within 15 seconds. When the first fire detector circuit continues to output only a fire alarm, if the second fire detector circuit successively outputs an overheat and a fire alarm state, the fire control box outputs a fire alarm signal, determines that the first fire detector circuit is faulty, and records and isolates the fault information of the first fire detector circuit; if the second fire detector circuit only outputs an overheat signal, the fire control box outputs a fire alarm signal, determines that the first fire detector and the second fire detector circuit are in a faulty state, and records and isolates the fault information of the first fire detector circuit and the second fire detector circuit; If the second fire detector circuit only outputs a fire alarm status, the fire control box outputs a fire alarm signal, and at the same time determines that the first fire detector and the second fire detector circuit are in a fault state, and records and isolates the fault information of the first fire detector circuit and the second fire detector circuit; if the second fire detector circuit outputs a fault state, the fire control box outputs a fire alarm signal, determines that the first fire detector circuit is faulty, and records and isolates the fault information of the first fire detector circuit and the second fire detector circuit; if the second fire detector circuit always outputs a normal state, the fire control box does not output a fire alarm, overheating, or fault status, determines that the first fire detector circuit is faulty, and records and isolates the fault information of the first fire detector circuit.

[0009] Preferably, if the first fire detector circuit outputs a fault state, the fire control box continuously monitors the first fire detector and the second fire detector circuit within 15 seconds; if the second fire detector circuit outputs an overheating state and a fire alarm state successively, the fire control box outputs a fire alarm signal, and records and isolates the fault information of the first fire detector circuit; if the second fire detector circuit only outputs an overheating state, the fire control box outputs an overheating alarm signal, and records and isolates the fault information of the first fire detector circuit; if the second fire detector circuit only outputs a fire alarm state, the fire control box outputs a fire alarm signal. The fire alarm control box outputs a fire alarm signal to determine that the second fire alarm detector circuit is faulty, and records and isolates the fault information of the first fire alarm detector circuit and the second fire alarm detector circuit; if the second fire alarm detector circuit outputs a fault state, the fire control box outputs a fire alarm signal to determine that the first fire alarm detector circuit and the second fire alarm detector circuit are faulty, and records and isolates the fault information of the first fire alarm detector circuit and the second fire alarm detector circuit; if the second fire alarm detector circuit outputs a normal state, the fire control box does not output a fire alarm, overheating, or fault state, and records and isolates the fault information of the first fire alarm detector circuit.

[0010] Preferably, if the first fire detector circuit outputs a normal state, and if the second fire detector circuit outputs overheating and fire alarm states successively, the fire protection control box outputs a fire alarm signal, and determines the first fire detector circuit to be faulty, and records and isolates the fault information; if the second fire detector circuit only outputs an overheating state, the fire protection control box does not output a fire alarm, overheating, or fault state, and determines the second fire detector circuit to be faulty, and records and isolates the fault information; if the second fire detector circuit only outputs a fire alarm state, the fire protection control box does not output a fire alarm, overheating, or fault state, determines that the second fire detector circuit is faulty, and records and isolates the fault information of the second fire detector circuit; if the second fire detector circuit outputs a fault state, the fire protection control box does not output a fire alarm, overheating, or fault state, determines that the second fire detector circuit is faulty, and records and isolates the fault information of the second fire detector circuit; if the second fire detector circuit outputs a normal state, the fire protection control box does not output a fire alarm, overheating, or fault state.

[0011] The present application discloses a fire detection system logic judgment method, which arranges two three-diaphragm box pneumatic fire detectors side by side to form a first fire detector and a second fire detector. The first fire detector and the second fire detector detect information in the aircraft engine compartment in real time and send it to the fire control box in real time; the fire control box registers the information of the first fire detector and the second fire detector respectively, and when the output information of the first fire detector or the second fire detector is sent to the fire control box, the fire control box can accurately distinguish the first fire detector from the second fire detector according to the registered information; by performing logical judgment on the output information of the dual-circuit fire detection system, the reliability of the engine compartment fire detection system can be effectively improved and the false alarm rate of the system can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0013] Figure 1 This is a schematic diagram of the overall structure of this application;

[0014] Figure 2 A logical judgment diagram of the first fire alarm detector of the present application combined with the second fire alarm detector when overheating and fire alarms respond successively;

[0015] Figure 3 A schematic diagram of logic judgment of the first fire alarm detector of the present application when it is overheated and combined with the second fire alarm detector;

[0016] Figure 4A schematic diagram of logic judgment of the first fire alarm detector of the present application in combination with the second fire alarm detector when a fire alarm occurs;

[0017] Figure 5 A schematic diagram of logic judgment of the first fire alarm detector of the present application when it fails and is combined with the second fire alarm detector;

[0018] Figure 6 This is a logic judgment diagram of the first fire alarm detector of the present application being combined with the second fire alarm detector under normal conditions;

[0019] 1. First fire detector; 2. Second fire detector; 3. Fire control box; 4. Health management system; 5. Waypoint alarm system. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0021] A fire detection system logic judgment method, such as Figure 1 As shown, the following steps are included:

[0022] Step S100, two three-diaphragm pneumatic fire detectors are arranged side by side to form a first fire detector 1 and a second fire detector 2. The first fire detector 1 and the second fire detector 2 detect information in the aircraft engine compartment in real time and send it to the fire control box 3 in real time;

[0023] The fire control box 3 registers the information of the first fire detector 1 and the second fire detector 2 respectively. When the output information of the first fire detector 1 or the second fire detector 2 is sent to the fire control box 3, the fire control box 3 can accurately distinguish the first fire detector 1 and the second fire detector 2 according to the registered information.

[0024] In step S200, the fire control box 3 first detects the output information of the first fire detector 1, and then compares the output information of the second fire detector 2 with the first fire detector 1, performs logical judgment, and judges the different states in the aircraft engine compartment according to the different information of the first fire detector 1 and the second fire detector 2, and outputs the judgment result to the avionics alarm system 5 and the health management system 4.

[0025] The specific method of logical judgment is:

[0026] like Figure 2As shown, if the first fire detector 1 circuit outputs overheat and fire alarm status successively, the fire alarm signal is directly output without waiting for the control box to detect the status of the second fire detector 2 circuit. As long as the second fire detector 2 circuit does not output overheat and fire alarm status successively, it is determined that the second fire detector 2 circuit is faulty, and the fault information of the second fire detector 2 circuit is recorded and isolated.

[0027] If a fire detector fails, the output information of the fire detector that is not failed shall prevail.

[0028] like Figure 3 As shown, if the first fire detector 1 circuit only outputs an overheat alarm signal, the fire control box 3 will continue to monitor the first fire detector 1 and the second fire detector 2 circuits within 15s. When the first fire detector 1 circuit continues to output only an overheat alarm, if the second fire detector 2 circuit successively outputs an overheat and fire alarm status, the fire control box 3 will output a fire alarm signal, determine that the first fire detector 1 circuit is faulty, and record and isolate the fault information of the first fire detector 1 circuit; if the second fire detector 2 circuit only outputs an overheat signal, the fire control box 3 will output an overheat alarm signal; if the second fire detector 2 circuit only outputs a fire alarm status, The fire control box 3 then outputs a fire alarm signal, and at the same time determines that the first fire detector 1 and the second fire detector 2 circuits are in a fault state, and records and isolates the fault information of the first fire detector 1 circuit and the second fire detector 2 circuit; if the second fire detector 2 circuit outputs a fault state, the fire control box 3 outputs an overheating alarm signal, and records and isolates the fault information of the second fire detector 2 circuit; if the second fire detector 2 circuit always outputs a normal state, the fire control box 3 does not output a fire alarm, overheating, or fault state, determines that the first fire detector 1 circuit is faulty, and records and isolates the fault information of the first fire detector 1 circuit.

[0029] like Figure 4As shown, if the first fire detector 1 circuit only outputs a fire alarm signal, the fire control box 3 will continue to monitor the first fire detector 1 and the second fire detector 2 circuits within 15s. When the first fire detector 1 circuit continues to output only a fire alarm, if the second fire detector 2 circuit successively outputs an overheat and a fire alarm state, the fire control box 3 will output a fire alarm signal, determine that the first fire detector 1 circuit is faulty, and record and isolate the fault information of the first fire detector 1 circuit; if the second fire detector 2 circuit only outputs an overheat signal, the fire control box 3 will output a fire alarm signal, and at the same time determine that the first fire detector 1 and the second fire detector 2 circuits are in a fault state, and record and isolate the fault information of the first fire detector 1 circuit and the second fire detector 2 circuit; If the second fire detector 2 circuit only outputs the fire alarm status, the fire control box 3 outputs a fire alarm signal, and at the same time determines the first fire detector 1 and the second fire detector 2 circuits as fault status, and records and isolates the fault information of the first fire detector 1 circuit and the second fire detector 2 circuit; if the second fire detector 2 circuit outputs the fault status, the fire control box 3 outputs a fire alarm signal, determines that the first fire detector 1 circuit is faulty, and records and isolates the fault information of the first fire detector 1 circuit and the second fire detector 2 circuit; if the second fire detector 2 circuit always outputs the normal status, the fire control box 3 does not output the fire alarm, overheating, or fault status, determines that the first fire detector 1 circuit is faulty, and records and isolates the fault information of the first fire detector 1 circuit.

[0030] This application adds a dual judgment design for overheating and fire alarms, and accurately judges the alarm status by outputting overheating and fire alarm signals at the same time. When any alarm signal appears, while ensuring accurate judgment, there is no need to make multiple judgments, and the status of the two circuits can be accurately known with one judgment. At the same time, any signal is classified, and no unresponsive signal will appear. Any signal is within the judgment range of this application.

[0031] The basic principle of this logical judgment is: fire alarm information must be accompanied by overheating information. When the fire alarm detector outputs fire alarm information, overheating information must appear. If it does not appear, it means that the corresponding fire alarm detector is faulty; if the fire alarm detector outputs overheating information, fire alarm information may not appear. If one of the two fire alarm detectors outputs overheating information and the other outputs fire alarm information, overheating and fire alarm information must appear at the same time, and both fire alarm detectors are faulty. For fire alarm detectors that have already fed back fault information, they can be directly recorded and isolated without the need for re-judgment. The priority of fire alarm is higher than the priority of overheating and fault, the priority of continuous normal state is higher than the priority of fire alarm, and the priority of successively outputting overheating and fire alarm states is higher than the priority of normal state.

[0032] like Figure 5 As shown, if the first fire detector 1 circuit outputs a fault state, the fire control box 3 will continue to monitor the first fire detector 1 and the second fire detector 2 circuits within 15s. If the second fire detector 2 circuit outputs overheating and fire alarm states successively, the fire control box 3 will output a fire alarm signal, and record and isolate the fault information of the first fire detector 1 circuit; if the second fire detector 2 circuit only outputs an overheating state, the fire control box 3 will output an overheating alarm signal, and record and isolate the fault information of the first fire detector 1 circuit; if the second fire detector 2 circuit only outputs a fire alarm state, the fire control box 3 will output a fire alarm signal. The fire alarm control box 3 outputs a fire alarm signal to determine that the second fire alarm detector 2 circuit is faulty, and records and isolates the fault information of the first fire alarm detector 1 circuit and the second fire alarm detector 2 circuit; if the second fire alarm detector 2 circuit outputs a fault state, the fire control box 3 outputs a fire alarm signal to determine that the first fire alarm detector 1 circuit and the second fire alarm detector 2 circuit are faulty, and records and isolates the fault information of the first fire alarm detector 1 circuit and the second fire alarm detector 2 circuit; if the second fire alarm detector 2 circuit outputs a normal state, the fire control box 3 does not output a fire alarm, overheating, or fault state, and records and isolates the fault information of the first fire alarm detector 1 circuit.

[0033] like Figure 6 As shown, if the first fire detector 1 circuit outputs a normal state, if the second fire detector 2 circuit outputs overheating and fire alarm states successively, the fire control box 3 outputs a fire alarm signal, and determines the first fire detector 1 circuit as a fault, and records and isolates the fault information; if the second fire detector 2 circuit only outputs an overheating state, the fire control box 3 does not output a fire alarm, overheating, or fault state, and determines the second fire detector 2 circuit as a fault, and records and isolates the fault information; if the second fire detector 2 circuit only outputs a fire alarm state, the fire control box 3 does not output a fire alarm, overheating, or fault state, determines that the second fire detector 2 circuit is faulty, and records and isolates the fault information of the second fire detector 2 circuit; if the second fire detector 2 circuit outputs a fault state, the fire control box 3 does not output a fire alarm, overheating, or fault state, determines that the second fire detector 2 circuit is faulty, and records and isolates the fault information of the second fire detector 2 circuit; if the second fire detector 2 circuit outputs a normal state, the fire control box 3 does not output a fire alarm, overheating, or fault state.

[0034] The health management system 4 is a database that can store and manage the alarm information of different smoke detectors 1 separately to facilitate staff to check.

[0035] The waypoint warning system 5 is used to receive information from the first fire detector 1 and the second fire detector 2 and send out a warning signal when a fire occurs.

[0036] By performing logical judgment on the output information of the dual-circuit fire detection system, the reliability of the engine compartment fire detection system can be effectively improved and the false alarm rate of the system can be reduced.

[0037] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fire detection system logic judgment method, characterized in that: include: Two three-diaphragm pneumatic fire detectors are arranged side by side to form a first fire detector (1) and a second fire detector (2). The first fire detector (1) and the second fire detector (2) detect information in the aircraft engine compartment in real time and send it to the fire control box (3) in real time. The fire control box (3) first detects the output information of the first fire detector (1), and then compares the output information of the second fire detector (2) with the first fire detector (1), performs logical judgment, judges different states in the aircraft engine compartment according to the different information of the first fire detector (1) and the second fire detector (2), and outputs the judgment result to the avionics warning system (5) and the health management system (4); If the first fire detector (1) circuit outputs overheat and fire alarm status successively, a fire alarm signal is directly output without waiting for the control box to detect the status of the second fire detector (2) circuit; as long as the second fire detector (2) circuit does not output overheat and fire alarm status successively, the second fire detector (2) circuit is determined to be faulty, and the fault information of the second fire detector (2) circuit is recorded and isolated; If the first fire detector (1) circuit only outputs an overheat alarm signal, the fire control box (3) continuously monitors the first fire detector (1) and the second fire detector (2) circuits for 15 seconds. If the second fire detector (2) circuit outputs an overheat and fire alarm status successively while the first fire detector (1) circuit continues to output only an overheat alarm, the fire control box (3) outputs a fire alarm signal, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit. If the second fire detector (2) circuit only outputs an overheat alarm signal, the fire control box (3) outputs an overheat alarm signal. If the second fire detector (2) circuit only outputs a fire alarm status, the fire control box (3) outputs a fire alarm signal. The fire control box (3) outputs a fire alarm signal, and at the same time determines that the first fire detector (1) and the second fire detector (2) circuits are in a fault state, and records and isolates the fault information of the first fire detector (1) circuit and the second fire detector (2) circuit; if the second fire detector (2) circuit outputs a fault state, the fire control box (3) outputs an overheat alarm signal, and records and isolates the fault information of the second fire detector (2) circuit; if the second fire detector (2) circuit always outputs a normal state, the fire control box (3) does not output a fire alarm, overheat, or fault state, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit.

2. The fire detection system logic judgment method according to claim 1, characterized in that: If the first fire detector (1) circuit only outputs a fire alarm signal, the fire control box (3) continuously monitors the first fire detector (1) and the second fire detector (2) circuits for 15 seconds. If the second fire detector (2) circuit successively outputs overheat and fire alarm states while the first fire detector (1) circuit continues to output only a fire alarm, the fire control box (3) outputs a fire alarm signal, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit; if the second fire detector (2) circuit only outputs an overheat signal, the fire control box (3) outputs a fire alarm signal, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit and the second fire detector (2) circuit; if If the second fire detector (2) circuit only outputs a fire alarm state, the fire control box (3) outputs a fire alarm signal, and at the same time determines that the first fire detector (1) and the second fire detector (2) circuits are in a fault state, and records and isolates the fault information of the first fire detector (1) circuit and the second fire detector (2) circuit; if the second fire detector (2) circuit outputs a fault state, the fire control box (3) outputs a fire alarm signal, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit and the second fire detector (2) circuit; if the second fire detector (2) circuit always outputs a normal state, the fire control box (3) does not output a fire alarm, overheating, or fault state, determines that the first fire detector (1) circuit is faulty, and records and isolates the fault information of the first fire detector (1) circuit.

3. The fire detection system logic judgment method according to claim 1, characterized in that: If the first fire detector (1) circuit outputs a fault state, the fire control box (3) continuously monitors the first fire detector (1) and the second fire detector (2) circuits for 15 seconds. If the second fire detector (2) circuit outputs an overheat state and a fire alarm state successively, the fire control box (3) outputs a fire alarm signal and records and isolates the fault information of the first fire detector (1) circuit. If the second fire detector (2) circuit outputs only an overheat state, the fire control box (3) outputs an overheat alarm signal and records and isolates the fault information of the first fire detector (1) circuit. If the second fire detector (2) circuit outputs only a fire alarm state, the fire control box (3) outputs a fire alarm signal. The fire alarm control box (3) outputs a fire alarm signal, determines that the circuit of the second fire alarm detector (2) is faulty, and records and isolates the fault information of the circuit of the first fire alarm detector (1) and the circuit of the second fire alarm detector (2); if the circuit of the second fire alarm detector (2) outputs a faulty state, the fire alarm control box (3) outputs a fire alarm signal, determines that the circuit of the first fire alarm detector (1) and the circuit of the second fire alarm detector (2) are faulty, and records and isolates the fault information of the circuit of the first fire alarm detector (1) and the circuit of the second fire alarm detector (2); if the circuit of the second fire alarm detector (2) outputs a normal state, the fire alarm control box (3) does not output a fire alarm, overheating or fault state, and records and isolates the fault information of the circuit of the first fire alarm detector (1).

4. The fire detection system logic judgment method according to claim 1, characterized in that: If the first fire detector (1) circuit outputs a normal state, and if the second fire detector (2) circuit outputs an overheat state and a fire alarm state successively, the fire control box (3) outputs a fire alarm signal, and determines that the first fire detector (1) circuit is faulty, and simultaneously records and isolates the fault information; if the second fire detector (2) circuit outputs only an overheat state, the fire control box (3) does not output a fire alarm, overheat or fault state, and determines that the second fire detector (2) circuit is faulty, and simultaneously records and isolates the fault information; if the second fire detector (2) circuit outputs only a fire alarm state, the fire control box (3) does not output a fire alarm, overheat or fault state, determines that the second fire detector (2) circuit is faulty, and records and isolates the fault information of the second fire detector (2) circuit; If the second fire alarm detector (2) circuit outputs a fault state, the fire prevention control box (3) does not output a fire alarm, overheating or fault state, determines that the second fire alarm detector (2) circuit is faulty, and records and isolates the fault information of the second fire alarm detector (2) circuit; if the second fire alarm detector (2) circuit outputs a normal state, the fire prevention control box (3) does not output a fire alarm, overheating or fault state.

Images