A distributed-centralized fire-fighting two-bus system

Abstract

The application provides a distribution-centralized fire-fighting two-bus system, belonging to the field of fire safety engineering, comprising a host module, a detector module and a pre-warning and alarm module, wherein the host module is used for reading the working state of the detector module and issuing an alarm to the pre-warning and alarm module through the read parameters; the detector module is distributedly installed in a detection area and used for detecting fire in the detection area; and the detection area is increased through the distributed arrangement. The application designs a distribution-centralized fire-fighting two-bus protocol, greatly improving the response speed of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fire safety engineering, in particular to a distributed-centralized fire two-wire bus system. BACKGROUND

[0002] In the field of fire safety engineering, the technical core of the vast majority of fire alarm systems is a typical fire two-wire bus system. The host of the system can simultaneously realize power supply and communication with slave detectors through two wires, and has the advantages of simple layout and low power consumption. However, this system also has obvious disadvantages. First, its communication efficiency is low. It uses a host bus polling mechanism, which requires the host to constantly poll the status of each detector, and then observe whether an alarm is triggered. When there are many bus detectors, the system response is slow. Second, since it uses a distributed detection mode, each detector has a microprocessor that independently determines whether to trigger a fire alarm by measuring fire parameter data in the area. Due to the comprehensive requirements of low power consumption and cost, the processor of the distributed detector has very low capability and cannot perform complex calculations. To prevent false alarms, the system often sets the detector alarm threshold very high, resulting in low system fire alarm monitoring sensitivity.

[0003] To solve the above problems, some fire safety manufacturers use RS485, CAN, and other general bus systems to replace the fire two-wire bus system. The advantage of the general bus system is that it can transmit fire parameter data information collected by all detectors in the system to the host in real time, and then perform intelligent analysis through the host, greatly improving the system's sensitivity and response time.

[0004] However, the above bus requires upgrading the related hardware system, which not only increases system power consumption and system cost, but also increases cost and field construction difficulty compared to the typical two-wire bus system. The upgrade difficulty is also greatly increased for the existing fire two-wire bus market, and the market acceptance is low. SUMMARY

[0005] To solve the above technical problems, the present application provides a distributed-centralized fire two-wire bus system, which includes a host module, a detector module, and a pre-alarm and alarm module. The host module is used to read the working status of the detector module and issue an alarm to the pre-alarm and alarm module based on the read parameters. The detector module is distributedly installed in the detection area and is used for fire detection in the detection area. When the system is working, the following steps need to be performed:

[0006] System initialization, numbering of the detector modules in the system, numbering method: according to the time of accessing the system, the serial number of the detector module is increased one by one from small to large, forming the module number of the detector module.

[0007] In the area configuration stage, the host module sets the area according to a predefined detector relationship, and sends the area number to each detector module.

[0008] In the inspection stage, the host module inspects through the inspection bus protocol, and reads the working state of the detector module.

[0009] In the alarm stage, the host module inspects the alarm of the detector module through the inspection bus, and enters the early warning query mode; through the query protocol, the host module collects the maximum data of the fire parameters collected by all the detector modules in the same area, and judges whether there is a fire alarm according to the change trend of the fire parameters.

[0010] In the fault state, if there is a fault in the bus inspection, the fault detector module label is directly analyzed and reported according to the protocol, and the fault flag bit is cleared.

[0011] Further, the bus protocol includes an inspection protocol and a query protocol, and the basic instruction format of the inspection protocol is: inspection function code + inspection result response + detector module number response + check bit, wherein the inspection function code is a fixed format code, the competition rule of the inspection result response is: fire alarm > fault > early warning > normal, and the competition rule of the detector module number response is high priority, the detector number is converted into 8 bits, and the competition is performed according to the high priority rule. Once a fire alarm occurs, the detector with the relatively largest code is read preferentially when multiple detectors alarm.

[0012] Further, the basic format of the query protocol instruction is: query function code + detector area + detector area data response + check bit, the query function code is a fixed format code, the detector area is the position code of the host built-in detector module, and the competition rule of the detector area data response is: the detector module first normalizes the current fire data, and competes according to the high priority rule.

[0013] Further, when the detector module accesses the system, it needs to be registered on the host module, and the system records the time stamp of each detector module accessing the system, and takes the time stamp as the basis for numbering, and the system allocates an increasing serial number to the detector module according to the order of the time stamp.

[0014] Further, the predefined detector relationship: the system administrator will define the relationship between the detector modules in advance according to the layout of the building and the fire-fighting requirements, which includes the floor, area, and functional partition where they are located; the host module will assign a unique number to each area according to these predefined relationships; the host module will send the area number to each detector module through the communication bus; after receiving the area number, the detector module will combine it with its own module number to form a format like "area number-detector module".

[0015] Further, during the inspection process, if the host module finds that any detector module reports a fire alarm or a pre-alarm state, it will immediately start the alarm process; the host module enters a special query mode to obtain more detailed fire parameter information; the host module collects fire parameters from all detector modules in the same area through the query protocol.

[0016] Further, the fault state is that, during the inspection process, if the host module cannot communicate with a certain detector module or the detector module returns an error message, the system will identify it as a fault; the host module will parse the number of the faulty detector module according to the protocol and report the fault information to the monitoring center or the administrator; after the fault is repaired, the system administrator or the maintenance personnel will manually or automatically clear the fault flag bit so that the detector module can rejoin the system and resume normal work.

[0017] The beneficial effects of the present application compared with the prior art are: the present application designs a distributed-centralized fire-fighting two-bus protocol, which greatly improves the system response speed. A centralized-distributed detection decision mode is adopted, which fully utilizes the maximum computing power of the system, and the host and the distributed detector jointly realize the alarm. When the detector detects a fire alarm, it directly reports to the host. When the detector detects a pre-alarm, the host combines the fire parameter data information collected by other detectors in the area where the pre-alarm detector is located to perform comprehensive intelligent algorithm analysis, realizes tight coupling of information within the area, performs overall situation awareness on whether there is a fire alarm in the area, and thus makes a judgment on whether there is a fire alarm, greatly improving the sensitivity of the system fire monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 An exemplary block diagram of the module distribution of the present application.

[0019] Figure 2 An exemplary block diagram of the system configuration of the present application. DETAILED DESCRIPTION

[0020] Embodiment: As Figure 1The distributed-concentrated fire-fighting two-bus system includes a host module, a detector module and a pre-warning and alarm module, the host module is used for reading the working state of the detector module and issuing an alarm to the pre-warning and alarm module according to the read parameters; the detector module is distributedly installed in a detection area and is used for detecting fire in the detection area, and the system needs to perform the following steps when working:

[0021] System initialization, the detector module in the system is numbered, the numbering mode is that the serial number of the detector module is increased one by one from small to large according to the time of accessing the system, thereby forming the module number of the detector module.

[0022] In the area configuration stage, the host module sets the area according to the pre-defined detector relationship and issues the area number to each detector module, and the detector module splices the area number and the module number to form the unique number of the detector module.

[0023] In the inspection stage, the host module inspects through the inspection bus protocol and reads the corresponding working state of the detector module.

[0024] In the alarm stage, the host module inspects the detector module alarm through the inspection bus, the host module enters the pre-warning query mode, collects the maximum data of the fire parameters collected by all the detector modules in the same area of the pre-warning and alarm module through the query protocol, and judges whether there is a fire alarm according to the change trend of the fire parameters through the detection algorithm.

[0025] Fault state, if the bus inspection exists a fault, the fault detector module label is directly analyzed and reported according to the protocol, and the fault flag bit is cleared.

[0026] The bus protocol includes the inspection protocol and the query protocol, the basic instruction format of the inspection protocol is: inspection function code + inspection result response + detector module number response + check bit, wherein the inspection function code is a fixed format code, the competition rule of the inspection result response is: fire alarm > fault > pre-warning > normal, and the competition rule of the detector module number response is high priority, the detector number is converted into 8 bits, and the competition is performed according to the high priority rule. Once a fire alarm occurs, the detector with the relatively largest code is read preferentially when multiple detectors alarm.

[0027] The basic format of the query protocol instruction is: query function code + detector area + detector area data response + check bit, the query function code is a fixed format code, the detector area is the position code of the built-in detector module in the host, and the competition rule of the detector area data response is that the detector module first normalizes the current fire data and competes according to the high priority rule.

[0028] When the detector module accesses the system, it needs to be registered on the host module, and the system will record the time stamp of each detector module accessing the system. The system assigns an increasing serial number to the detector module according to the order of the time stamp.

[0029] Predefined detector relationship: The system administrator will define the relationship between the detector modules in advance according to the layout of the building and the fire protection requirements, which includes the floor, area, and functional partition where they are located. The host module will assign a unique number to each area according to these predefined relationships. For example, the first module accessed is numbered 001, the second is numbered 002, and so on. The host module sends the area number to each detector module through the communication bus. After receiving the area number, the detector module combines it with its own module number to form a format like "area number-detector module". For example, the format is "1-001", where "1" represents the area number and "001" represents the module number. The assigned number is stored in the database of the host module and also written into the memory of the detector module for subsequent identification and communication.

[0030] If the host module finds any detector module reporting a fire or pre-alarm state during the inspection process, it will immediately start the alarm process. The host module enters a special query mode to obtain more detailed fire parameter information. The host module collects fire parameters from all detector modules in the same area through the query protocol.

[0031] Fault state: If the host module cannot communicate with a certain detector module during the inspection process, or the detector module returns an error message, the system will identify it as a fault. The host module will parse the number of the faulty detector module according to the protocol and report the fault information to the monitoring center or management personnel. After the fault is repaired, the system administrator or maintenance personnel will manually or automatically clear the fault flag bit so that the detector module can rejoin the system and resume normal work.

[0032] The above content is only an example and description of the invention. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the invention or exceed the scope defined by the present claims.

Claims

1. A distributed-centralized fire protection two-bus system, characterized by: The application comprises a host module, a detector module and a pre-warning and alarm module, wherein the host module is used to read the working state of the detector module and to issue a warning to the pre-warning and alarm module according to the read parameters; the detector module is distributedly installed in a detection area and used to detect fire in the detection area; and the system needs to perform the following steps when working: System initialization, numbering of the detector modules in the system, the numbering method being that the serial numbers of the detector modules are increased one by one from small to large according to the time of access to the system to form the module numbers of the detector modules; Area configuration stage, area setting by the host module according to the pre-defined detector relationship and issuance of the area numbers to the detector modules, the detector modules splicing the area numbers with the module numbers to form the unique numbers of the detector modules; Pre-defined detector relationship: the system administrator will predefine the relationship between the detector modules according to the layout of the building and the fire-fighting demand, which includes the floor, area and functional partition where the detector modules are located; the host module will allocate a unique number to each area according to the pre-defined relationship; the host module will send the area numbers to the detector modules through the communication bus; and the detector modules will combine the area numbers with their own module numbers to form the format of "area number-detector module" after receiving the area numbers; Inspection stage, inspection by the host module through the inspection bus protocol to read the corresponding working state of the detector modules; the bus protocol comprises an inspection protocol and a query protocol, the basic instruction format of the inspection protocol being: inspection function code + inspection result response + detector module number response + check bit, wherein the inspection function code is a fixed format code, the competition rule of the inspection result response being: fire alarm > fault > pre-warning > normal, and the competition rule of the detector module number response being high-bit competition, the detector number being converted into 8-bit, and the high-bit priority rule being used for competition; once a fire alarm occurs, the detector with the relatively largest code is read preferentially when multiple detectors alarm; The basic instruction format of the query protocol being: query function code + detector area + detector area data response + check bit, wherein the query function code is a fixed format code, the detector area is the location code of the built-in detector module of the host, and the competition rule of the detector area data response being that the detector module first normalizes the current fire data and uses the high-bit priority rule for competition; Alarm stage, detection of the alarm of the detector module by the host module through the inspection bus, entry of the host module into a pre-warning query mode, collection of the maximum data of the fire parameters collected by all the detector modules in the same area of the pre-warning and alarm module through the query protocol, and judgment by the host module whether a fire alarm exists according to the change trend of the fire parameters through a detection algorithm; Fault state, direct analysis of the fault detector module index according to the protocol for reporting the fault and clearing the fault index at the same time if the bus inspection exists a fault.

2. A distributed-centralized fire protection two-bus system according to claim 1, characterized in that: The detector module needs to be registered on the host module when accessing the system, and the system will record the time stamp of each detector module accessing the system. The system assigns an increasing serial number to the detector module according to the order of the time stamp.

3. A distributed-centralized fire protection two-bus system according to claim 1, characterized in that: If the host module finds any detector module reporting a fire alarm or a pre-alarm state during the inspection process, the alarm process will be started immediately. The host module enters a special query mode to obtain more detailed fire parameter information. The host module collects fire parameters from all detector modules in the same area through the query protocol.

4. A distributed-centralized fire protection two-bus system according to claim 1, characterized in that: The fault state is that, during the inspection process, if the host module cannot communicate with a certain detector module or the detector module returns error information, the system will identify it as a fault. The host module will parse the number of the faulty detector module according to the protocol and report the fault information to the monitoring center or the administrator. After the fault is repaired, the system administrator or the maintenance personnel will manually or automatically clear the fault flag.

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