Intelligent control system for garage group type air exhaust and smoke exhaust

Abstract

The invention provides an intelligent control system for garage group type air exhaust and smoke exhaust, relates to the technical field of garage air exhaust and smoke exhaust, and aims to enhance the response speed of starting air exhaust and smoke exhaust according to the carbon monoxide concentration and enhance the safety guarantee of stopping air exhaust and smoke exhaust according to the temperature. Comprising a plurality of air and smoke exhaust fans which are arranged in different sub-areas in a garage respectively, and each air and smoke exhaust fan is provided with a temperature sensor; the carbon monoxide sensor group comprises a plurality of carbon monoxide sensors which are respectively arranged in different sub-areas in the garage; the carbon monoxide concentration prediction module is used for predicting the carbon monoxide concentration of each sub-region at the time point of the next period; and the unit start-stop control module is used for controlling the opening and closing of the air and smoke exhaust fan unit. The control method has the advantages that the response of controlling the opening of the exhaust and smoke ventilator is faster, and the mode of controlling the closing of the exhaust and smoke ventilator is safer and more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation and smoke exhaust in a garage, and in particular to an intelligent control system for group ventilation and smoke exhaust in a garage. Background Art

[0002] In order to give people enough time to escape in the event of a fire or other disaster, garages are equipped with ventilation and smoke exhaust devices.

[0003] Nowadays, multiple sets of exhaust and smoke exhaust devices are usually installed in garages, and the exhaust and smoke exhaust work is usually turned on according to the exhaust and smoke exhaust timetable or the increase of carbon monoxide concentration signal, and then it can be turned off according to the decrease of carbon monoxide concentration or the increase of smoke temperature. However, since the existing technology has a certain lag in turning on the exhaust and smoke exhaust according to the increase of carbon monoxide concentration, the response speed of the exhaust and smoke exhaust to dangerous situations is reduced; at the same time, when it is turned off when the smoke temperature increases, it is a chain closure, that is, when the temperature of one point is reached, the exhaust of all exhaust and smoke exhaust devices in the entire smoke-proof partition will end. However, in fact, the smoke temperature in the fire scene will be different. If the exhaust is stopped after a short time, it may affect the evacuation of personnel.

[0004] Therefore, it is necessary to optimize the exhaust and smoke exhaust control in the garage, enhance the response speed of opening the exhaust and smoke exhaust according to the carbon monoxide concentration, and enhance the safety guarantee of stopping the exhaust and smoke exhaust according to the temperature. Summary of the invention

[0005] The object of the present invention is to provide an intelligent control system for group ventilation and smoke exhaust in a garage, which can enhance the response speed of opening ventilation and smoke exhaust according to carbon monoxide concentration and enhance the safety guarantee of stopping ventilation and smoke exhaust according to temperature.

[0006] The present invention is achieved through the following technical solutions:

[0007] An intelligent control system for group exhaust and smoke exhaust in a garage, comprising:

[0008] The exhaust and smoke exhaust fan unit includes a plurality of exhaust and smoke exhaust fans, which are respectively arranged in different sub-areas in the garage, and each exhaust and smoke exhaust fan is respectively provided with a temperature sensor;

[0009] A carbon monoxide sensor group includes a plurality of carbon monoxide sensors, which are respectively arranged in different sub-areas in the garage;

[0010] A carbon monoxide concentration prediction module, used to predict the carbon monoxide concentration of each sub-area at a next periodic time point based on the historical detection data of the carbon monoxide sensor group;

[0011] The unit start-stop control module is used to control the opening of the exhaust and smoke exhaust fan unit according to the predicted result of the carbon monoxide concentration, and control the closing of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor after the exhaust and smoke exhaust fan unit is turned on.

[0012] Preferably, the temperature sensor is arranged at the air passage inlet of the exhaust and smoke exhaust fan.

[0013] Preferably, the method for predicting the carbon monoxide concentration of each sub-area at the next cycle time point according to the historical detection data of the carbon monoxide sensor group is:

[0014] Build a predictive fitting model:

[0015]

[0016] in, represents the predicted value of carbon monoxide concentration in the jth sub-region at the nth cycle time point, gc i (n-1) represents the carbon monoxide concentration detection value of the carbon monoxide sensor in the first sub-area at the n-1th cycle time point, a i,j represents the weight of the i-th sub-region when predicting the carbon monoxide concentration in the j-th sub-region, b j represents the prediction bias of the j-th sub-region, and M represents the total number of sub-regions;

[0017] Experiments were conducted in an actual garage, and the carbon monoxide concentration detection value of the carbon monoxide sensor in each sub-area was recorded at each periodic point. Parameters of the prediction fitting model were fitted to obtain a i,j and b j .

[0018] Preferably, the least square method or gradient descent method is used when performing the parameter fitting.

[0019] Preferably, the method for controlling the opening of the exhaust and smoke exhaust fan unit according to the prediction result of the carbon monoxide concentration is:

[0020] Determine whether the predicted value of the carbon monoxide concentration in the j-th sub-area at the next periodic time point exceeds a preset carbon monoxide concentration threshold;

[0021] If so, the exhaust and smoke exhaust fan unit of the j-th sub-area is controlled to be turned on, otherwise no operation is performed.

[0022] Preferably, the method for controlling the shutdown of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor is:

[0023] Periodically acquiring detection values ​​of all the temperature sensors;

[0024] If the detection value of the temperature sensor in the jth sub-area at the current time point reaches the preset temperature threshold, the first closing time of the exhaust and smoke exhaust fan that was first closed and the second closing time of the exhaust and smoke exhaust fan that was most recently closed are obtained;

[0025] The closing time of the exhaust and smoke exhaust fan in the j-th sub-area is determined according to the first closing time and the second closing time.

[0026] Preferably, the method for determining the closing time of the exhaust and smoke exhaust fan of the j-th sub-area according to the first closing time and the second closing time is:

[0027] Get the reference time τ:

[0028]

[0029] Wherein, t1 and t2 are the first closing time and the second closing time respectively and the unit is second, e is a natural constant, μ is an empirical bias, and ω is an empirical coefficient;

[0030] If τ>0, the exhaust and smoke exhaust fan of the jth sub-area is turned off after time τ from the current time point, otherwise the exhaust and smoke exhaust fan of the jth sub-area is turned off immediately.

[0031] Preferably, the preset temperature threshold is 280 degrees Celsius.

[0032] Preferably, a remote warning is issued after all the exhaust and smoke exhaust fan units are shut down according to the detection result of the temperature sensor.

[0033] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0034] The present invention improves the response speed of the exhaust and smoke exhaust fan by predicting the carbon monoxide concentration and controlling the opening of the exhaust and smoke exhaust fan of the corresponding sub-area according to the prediction result;

[0035] When predicting the carbon monoxide concentration of each sub-area, the present invention predicts the carbon monoxide concentration based on the historical detection data of all sub-areas, taking into account the correlation between different sub-areas under the fluidity of smoke, and the prediction result has higher reliability;

[0036] The present invention does not use interlocking control when shutting down the exhaust and smoke exhaust fan through temperature monitoring, but performs separate control according to the temperature conditions at the exhaust and smoke exhaust fan of each sub-area, and can perform adaptive shutdown control according to the difference in smoke temperature in the fire scene;

[0037] The present invention also considers the closing time of each exhaust and smoke exhaust fan when individually controlling the temperature condition at each sub-area, so as to prevent the overall closing from being too fast and thus affecting the evacuation of personnel;

[0038] The invention is reasonably designed, easy to implement, and can be easily applied to various garages, and has high cost performance and scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the principle of an intelligent control system for group ventilation and smoke exhaust in a garage provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Example 1

[0042] This embodiment provides an intelligent control system for group exhaust and smoke exhaust in a garage, see Figure 1 ,include:

[0043] The exhaust and smoke exhaust fan unit includes a plurality of exhaust and smoke exhaust fans, which are respectively arranged in different sub-areas in the garage, and each exhaust and smoke exhaust fan is respectively provided with a temperature sensor;

[0044] A carbon monoxide sensor group includes a plurality of carbon monoxide sensors, which are respectively arranged in different sub-areas in the garage;

[0045] A carbon monoxide concentration prediction module, used to predict the carbon monoxide concentration of each sub-area at a next periodic time point based on the historical detection data of the carbon monoxide sensor group;

[0046] The unit start-stop control module is used to control the opening of the exhaust and smoke exhaust fan unit according to the predicted result of the carbon monoxide concentration, and control the closing of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor after the exhaust and smoke exhaust fan unit is turned on.

[0047] Compared with the traditional feedback control after the concentration exceeds the standard, this embodiment can predict the possible dangerous concentration changes in advance through the prediction mechanism, thereby improving the response speed of starting the fan, exhausting harmful gases faster and earlier, reducing smoke accumulation, and improving the operating efficiency and safety of the system. At the same time, the system can make independent judgments based on the temperature changes at the exhaust and smoke exhaust fans in each sub-area, and flexibly adjust the fan shutdown strategy based on the differentiated characteristics of smoke temperature in the fire scene. This method can adapt to the smoke distribution state in complex fire scenes, effectively avoid the problem of premature shutdown due to a single control mode before the evacuation of personnel, and improve the system's operational adaptability and safety.

[0048] In this embodiment, the temperature sensor is arranged at the air passage inlet of the exhaust and smoke exhaust fan.

[0049] As a preferred solution of this embodiment, the method for predicting the carbon monoxide concentration of each sub-area at the next cycle time point based on the historical detection data of the carbon monoxide sensor group is:

[0050] Build a predictive fitting model:

[0051]

[0052] in, represents the predicted value of carbon monoxide concentration in the jth sub-region at the nth cycle time point, gc i (n-1) represents the carbon monoxide concentration detection value of the carbon monoxide sensor in the i-th sub-area at the n-1-th cycle time point, a i,j represents the weight of the i-th sub-region when predicting the carbon monoxide concentration in the j-th sub-region, b j represents the prediction bias of the j-th sub-region, and M represents the total number of sub-regions;

[0053] Experiments were conducted in an actual garage, and the carbon monoxide concentration detection value of the carbon monoxide sensor in each sub-area was recorded at each periodic point. Parameters of the prediction fitting model were fitted to obtain a i,j and b j .

[0054] Furthermore, the least square method or gradient descent method is used when performing the parameter fitting.

[0055] This embodiment comprehensively considers the correlation between different sub-regions due to smoke fluidity during prediction. The established model system can more accurately reflect the flow characteristics of smoke between sub-regions, so that the prediction results are not only limited to the judgment of a single area data, but have the reliability of a global perspective, which significantly improves the accuracy of concentration prediction.

[0056] The method of controlling the opening of the exhaust and smoke exhaust fan unit according to the prediction result of the carbon monoxide concentration in this embodiment is preferably:

[0057] Determine whether the predicted value of the carbon monoxide concentration in the j-th sub-area at the next periodic time point exceeds a preset carbon monoxide concentration threshold;

[0058] If so, the exhaust and smoke exhaust fan unit of the j-th sub-area is controlled to be turned on, otherwise no operation is performed.

[0059] On the other hand, the method for controlling the closing of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor is:

[0060] Periodically acquiring detection values ​​of all the temperature sensors;

[0061] If the detection value of the temperature sensor in the jth sub-area at the current time point reaches the preset temperature threshold, the first closing time of the exhaust and smoke exhaust fan that was first closed and the second closing time of the exhaust and smoke exhaust fan that was most recently closed are obtained;

[0062] The closing time of the exhaust and smoke exhaust fan in the j-th sub-area is determined according to the first closing time and the second closing time.

[0063] Specifically, the method for determining the closing time of the exhaust and smoke exhaust fan of the j-th sub-area according to the first closing time and the second closing time is:

[0064] Get the reference time τ:

[0065]

[0066] Wherein, t1 and t2 are the first closing time and the second closing time respectively and the unit is second, e is a natural constant, μ is an empirical bias, and ω is an empirical coefficient;

[0067] If τ>0, the exhaust and smoke exhaust fan of the jth sub-area is turned off after time τ from the current time point, otherwise the exhaust and smoke exhaust fan of the jth sub-area is turned off immediately.

[0068] On this basis, the preset temperature threshold is 280 degrees Celsius.

[0069] When shutting down the exhaust and smoke exhaust fans due to excessively high temperatures, this embodiment fully considers the shutdown time interval of the exhaust and smoke exhaust fans in each sub-area, avoiding potential safety hazards caused by shutting down the overall fan too quickly. In the event of a fire emergency, the orderliness of the exhaust and smoke exhaust fan shutdown is ensured to provide sufficient time for the evacuation of on-site personnel, further enhancing the system's safety assurance capabilities. τ is equivalent to a delayed shutdown time, μ can be set to 1, and ω can be set based on actual experience. The larger the value, the longer the delayed shutdown time. It should be noted that a safety threshold greater than 280 degrees Celsius can also be set. If the temperature of this sub-area reaches this temperature value during the delayed shutdown process, the corresponding exhaust and smoke exhaust fan can be shut down in advance.

[0070] Finally, a remote warning may be issued after all the exhaust and smoke exhaust fan units are shut down according to the detection result of the temperature sensor.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent control system for group exhaust and smoke exhaust in a garage, characterized in that: include: The exhaust and smoke exhaust fan unit includes a plurality of exhaust and smoke exhaust fans, which are respectively arranged in different sub-areas in the garage, and each exhaust and smoke exhaust fan is respectively provided with a temperature sensor; A carbon monoxide sensor group includes a plurality of carbon monoxide sensors, which are respectively arranged in different sub-areas in the garage; A carbon monoxide concentration prediction module, used to predict the carbon monoxide concentration of each sub-area at a next periodic time point based on the historical detection data of the carbon monoxide sensor group; The unit start-stop control module is used to control the opening of the exhaust and smoke exhaust fan unit according to the predicted result of the carbon monoxide concentration, and control the closing of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor after the exhaust and smoke exhaust fan unit is turned on.

2. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 1, characterized in that: The temperature sensor is arranged at the air passage inlet of the air and smoke exhaust fan.

3. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 1, characterized in that: The method for predicting the carbon monoxide concentration of each sub-area at the next cycle time point based on the historical detection data of the carbon monoxide sensor group is: Build a predictive fitting model: in, represents the predicted value of carbon monoxide concentration in the jth sub-region at the nth cycle time point, gc i (n-1) represents the carbon monoxide concentration detection value of the carbon monoxide sensor in the i-th sub-area at the n-1-th cycle time point, a i，j represents the weight of the i-th sub-region when predicting the carbon monoxide concentration in the j-th sub-region, b j represents the prediction bias of the j-th sub-region, and M represents the total number of sub-regions; Experiments were conducted in an actual garage, and the carbon monoxide concentration detection value of the carbon monoxide sensor in each sub-area was recorded at each periodic point. Parameters of the prediction fitting model were fitted to obtain a i，j and b j .

4. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 3 is characterized in that: The least square method or gradient descent method is used for parameter fitting.

5. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 4, characterized in that: The method for controlling the opening of the exhaust and smoke exhaust fan unit according to the prediction result of the carbon monoxide concentration is: Determine whether the predicted value of the carbon monoxide concentration in the th sub-region at the next periodic time point exceeds a preset carbon monoxide concentration threshold; If so, the exhaust and smoke exhaust fan unit of the j-th sub-area is controlled to be turned on, otherwise no operation is performed.

6. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 1, characterized in that: The method for controlling the closing of the exhaust and smoke exhaust fan unit according to the detection result of the temperature sensor is: Periodically acquiring detection values ​​of all the temperature sensors; If the detection value of the temperature sensor in the th sub-area at the current time point reaches the preset temperature threshold, the first closing time of the exhaust and smoke exhaust fan that was first closed and the second closing time of the exhaust and smoke exhaust fan that was most recently closed are obtained; The closing time of the exhaust and smoke exhaust fan in the th sub-area is determined according to the first closing time and the second closing time.

7. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 6, characterized in that: The method for determining the closing time of the exhaust and smoke exhaust fan of the jth sub-area according to the first closing time and the second closing time is: Get the reference time τ: Wherein, t1 and t2 are the first closing time and the second closing time respectively and the unit is second, e is a natural constant, μ is an empirical bias, and ω is an empirical coefficient; If τ>0, the exhaust and smoke exhaust fan of the jth sub-area is turned off after time τ from the current time point, otherwise the exhaust and smoke exhaust fan of the jth sub-area is turned off immediately.

8. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 7, characterized in that: The preset temperature threshold is 280 degrees Celsius.

9. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 1, characterized in that: After all the exhaust and smoke exhaust fan units are shut down according to the detection result of the temperature sensor, a remote warning is issued.

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