An intelligent control system for group ventilation and smoke exhaust in a garage

Abstract

The present invention provides an intelligent control system for group exhaust and smoke exhaust in a garage, which relates to the technical field of exhaust and smoke exhaust in a garage. The purpose is to enhance the response speed of starting exhaust and smoke exhaust according to the carbon monoxide concentration and enhance the safety guarantee of stopping exhaust and smoke exhaust according to the temperature. It includes an exhaust and smoke exhaust fan group, which includes multiple exhaust and smoke exhaust fans respectively arranged in different sub-areas in the garage, and a temperature sensor is respectively arranged on each exhaust and smoke exhaust fan; a carbon monoxide sensor group, which includes multiple carbon monoxide sensors respectively arranged in different sub-areas in the garage; a carbon monoxide concentration prediction module for predicting the carbon monoxide concentration in each sub-area at the next cycle time point; a unit start-stop control module for controlling the start and stop of the exhaust and smoke exhaust fan group according to. The present invention has the advantages of faster opening response of controlling the exhaust and smoke exhaust machine and a safer and more reliable way of controlling the closing of the exhaust and smoke exhaust machine.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust and smoke extraction in garages, and more particularly, to an intelligent control system for group exhaust and smoke extraction in garages. Background Art

[0002] In order to buy enough time for people to escape in case of fire or other disasters, exhaust and smoke extraction devices are installed in garages.

[0003] Currently, multiple groups of exhaust and smoke extraction devices are usually installed in garages, and the exhaust and smoke extraction work is usually started according to the exhaust and smoke extraction schedule or the increase in carbon monoxide concentration signal, and then can be stopped according to the decrease in carbon monoxide concentration or the increase in flue gas temperature. However, since the existing technology has a certain lag in starting exhaust and smoke extraction according to the increase in carbon monoxide concentration, the response speed of exhaust and smoke extraction to emergencies is reduced; at the same time, when closing according to the increase in flue gas temperature, it is a chain closure, that is, when the temperature of one point reaches, the exhaust and smoke extraction of all exhaust and smoke extraction devices in the entire smoke prevention zone will end. However, in fact, there are differences in the flue gas temperature in the fire field. If the exhaust and smoke extraction stops after a short time, it may affect the evacuation of people.

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

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

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

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

[0008] An exhaust and smoke extraction fan group, including multiple exhaust and smoke extraction fans, which are respectively arranged in different sub - areas in the garage, and temperature sensors are respectively arranged on each exhaust and smoke extraction fan;

[0009] A carbon monoxide sensor group, including multiple carbon monoxide sensors, which are respectively arranged in different sub - areas in the garage;

[0010] A carbon monoxide concentration prediction module, which is used to predict the carbon monoxide concentration in each sub - area at the next cycle time point according to the historical detection data of the carbon monoxide sensor group;

[0011] The unit start-stop control module is used to control the start of the exhaust and smoke extraction fan unit according to the prediction result of the carbon monoxide concentration, and to control the shutdown of the exhaust and smoke extraction fan unit according to the detection result of the temperature sensor after the exhaust and smoke extraction fan unit is started.

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

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

[0014] Establish a prediction fitting model:

[0015]

[0016] Wherein, represents the predicted value of the carbon monoxide concentration of the j-th sub-region at the n-th cycle time point, gc i (n - 1) represents the detected value of the carbon monoxide concentration of the carbon monoxide sensor in the i-th sub-region 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 of the j-th sub-region, b j represents the prediction bias of the j-th sub-region, and M represents the total number of the sub-regions;

[0017] Conduct experiments in an actual garage, record the detected values of the carbon monoxide concentration of the carbon monoxide sensor in each sub-region at each cycle point, and perform parameter fitting on the prediction fitting model to obtain a i,j and b j .

[0018] Preferably, the least squares method or the gradient descent method is used for the parameter fitting.

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

[0020] Judge whether the predicted value of the carbon monoxide concentration of the j-th sub-region at the next cycle time point exceeds the preset carbon monoxide concentration threshold;

[0021] If so, control the start of the exhaust and smoke extraction fan unit in the j-th sub-region, otherwise do nothing.

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

[0023] Periodically obtain the detected values of all the temperature sensors;

[0024] If the detected value of the temperature sensor in the j-th sub-region at the current time point reaches the preset temperature threshold, obtain the first shutdown time of the first exhaust and smoke extraction fan that was shut down and the second shutdown time of the most recently shut down exhaust and smoke extraction fan;

[0025] Determine the shutdown time of the exhaust and smoke extraction fan in the j-th sub-region based on the first shutdown time and the second shutdown time.

[0026] Preferably, the method for determining the shutdown time of the exhaust and smoke extraction fan in the j-th sub-region based on the first shutdown time and the second shutdown time is as follows:

[0027] Obtain the reference time τ:

[0028]

[0029] where t1 and t2 are the first shutdown time and the second shutdown time respectively, and the unit of both is seconds, e is the natural constant, μ is the empirical bias, and ω is the empirical coefficient;

[0030] If τ>0, then shut down the exhaust and smoke extraction fan in the j-th sub-region τ seconds after the current time point, otherwise immediately shut down the exhaust and smoke extraction fan in the j-th sub-region.

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

[0032] Preferably, after controlling the shutdown of all the exhaust and smoke extraction fan groups according to the detection results of the temperature sensor, a remote warning is carried out.

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

[0034] By predicting the carbon monoxide concentration and controlling the opening of the exhaust and smoke extraction fans in the corresponding sub-regions according to the prediction results, the present invention improves the response speed of the exhaust and smoke extraction fans;

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

[0036] When shutting down the exhaust and smoke extraction fans through temperature monitoring, the present invention does not adopt chain control, but controls the temperature conditions at the exhaust and smoke extraction fans in each sub-region separately, and can better perform adaptive shutdown control according to the differences in the smoke temperature in the fire scene;

[0037] When the present invention separately controls the temperature conditions at the exhaust and smoke extraction fans in each sub-region, it also takes into account the shutdown times of each exhaust and smoke extraction fan to prevent the overall shutdown from being too fast and affecting the evacuation of personnel.

[0038] The present invention is reasonably designed, easy to implement, and convenient to be applied to various garages, with high cost performance and popularization potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the principle of the intelligent control system for group exhaust and smoke extraction in a garage provided in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To make the objectives, 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. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0041] Embodiment 1

[0042] This embodiment provides an intelligent control system for group exhaust and smoke extraction in a garage. Refer to Figure 1 , including:

[0043] An exhaust and smoke extraction fan group, including multiple exhaust and smoke extraction fans, which are respectively arranged in different sub-regions in the garage, and temperature sensors are respectively arranged on each exhaust and smoke extraction fan;

[0044] A carbon monoxide sensor group, including multiple carbon monoxide sensors, which are respectively arranged in different sub-regions in the garage;

[0045] A carbon monoxide concentration prediction module, configured to predict the carbon monoxide concentration in each sub-region at the next cycle time point according to the historical detection data of the carbon monoxide sensor group;

[0046] A unit start-stop control module, configured to control the start of the exhaust and smoke extraction fan group according to the prediction result of the carbon monoxide concentration, and control the shutdown of the exhaust and smoke extraction fan group according to the detection result of the temperature sensor after the exhaust and smoke extraction fan group is started.

[0047] Compared with the traditional feedback control after the concentration exceeds the standard, through the prediction mechanism, this embodiment can anticipate the possible dangerous concentration changes in advance, thereby improving the response speed of starting the fan, being able to discharge harmful gases faster and earlier, reducing the accumulation of flue gas, 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 extraction fans in each sub-region, and flexibly adjust the fan shutdown strategy according to the differentiated characteristics of the flue gas temperature in the fire scene. This method can adapt to the flue gas distribution state in complex fire scenarios, effectively avoiding the problem that the premature shutdown caused by a single control mode may occur before all personnel have been evacuated, and improving the operating adaptability and safety of the system.

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

[0049] As a preferred solution of this embodiment, the method for predicting the carbon monoxide concentration in each sub-region at the next cycle time point according to the historical detection data of the carbon monoxide sensor group is as follows:

[0050] Establish a prediction fitting model:

[0051]

[0052] Wherein, represents the predicted value of the carbon monoxide concentration in the j-th sub-region at the n-th cycle time point, gc i (n - 1) represents the detected value of the carbon monoxide concentration of the carbon monoxide sensor in the i-th sub-region 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 the sub-regions;

[0053] Conduct experiments in an actual garage, record the detected values of the carbon monoxide concentration of the carbon monoxide sensor in each sub-region at each cycle point, and perform parameter fitting on the prediction fitting model to obtain a i,j and b j .

[0054] Furthermore, the least squares method or the gradient descent method is used for the parameter fitting.

[0055] In this embodiment, when making predictions, the correlation caused by the fluidity of the flue gas between different sub-regions is comprehensively considered. The established model system can more accurately reflect the flow characteristics of the flue gas between sub-regions, making the prediction results not only limited to the judgment of single-region data, but having the reliability of a global perspective, and significantly improving the accuracy of concentration prediction.

[0056] The method for controlling the startup of the exhaust and smoke extraction fan group according to the prediction result of the carbon monoxide concentration in this embodiment is preferably as follows:

[0057] Judge whether the predicted value of the carbon monoxide concentration in the j-th sub-region at the next cycle time point exceeds the preset carbon monoxide concentration threshold;

[0058] If so, control the startup of the exhaust and smoke extraction fan group in the j-th sub-region, otherwise do nothing.

[0059] On the other hand, the method for controlling the shutdown of the exhaust and smoke extraction fan group according to the detection result of the temperature sensor is as follows:

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

[0061] If the detection value of the temperature sensor in the j-th sub-region at the current time point reaches the preset temperature threshold, obtain the first shutdown time of the first exhaust and smoke extraction fan to be shut down and the second shutdown time of the most recently shut down exhaust and smoke extraction fan;

[0062] Determine the shutdown time of the exhaust and smoke extraction fan in the j-th sub-region according to the first shutdown time and the second shutdown time.

[0063] Specifically, the method for determining the shutdown time of the exhaust and smoke extraction fan in the j-th sub-region according to the first shutdown time and the second shutdown time is as follows:

[0064] Obtain the reference time τ:

[0065]

[0066] where t1 and t2 are the first shutdown time and the second shutdown time respectively, and the unit of both is second, e is the natural constant, μ is the empirical bias, and ω is the empirical coefficient;

[0067] If τ>0, shut down the exhaust and smoke extraction fan in the j-th sub-region τ seconds after the current time point, otherwise immediately shut down the exhaust and smoke extraction fan in the j-th sub-region.

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

[0069] When shutting down the exhaust and smoke extraction fans at too high temperatures in this embodiment, the shutdown time intervals of the exhaust and smoke extraction fans in each sub-region are fully considered to avoid potential safety hazards that may be brought about by too fast shutdown of the overall fans. In case of a fire emergency, the orderly shutdown of the exhaust and smoke extraction fans is ensured, providing sufficient time for the evacuation of on-site personnel and further enhancing the safety guarantee ability of the system. τ is equivalent to a time for delayed shutdown, μ can be set to 1, and ω can be set according to actual experience. The larger its value, the longer the delayed shutdown time. It should be particularly noted that a safety threshold greater than 280 degrees Celsius can also be set. If the temperature of this sub-region reaches this temperature value during the delayed shutdown process, the corresponding exhaust and smoke extraction fan can be shut down in advance.

[0070] Finally, remote warning can also be carried out according to the detection results of the temperature sensors after the shutdown of all the exhaust and smoke extraction fan groups is completed.

[0071] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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, Including: An exhaust and smoke extraction fan unit, including multiple exhaust and smoke extraction fans, which are respectively arranged in different sub - regions of the garage, and temperature sensors are respectively arranged on each exhaust and smoke extraction fan; A carbon monoxide sensor group, including multiple carbon monoxide sensors, which are respectively arranged in different sub - regions of the garage; A carbon monoxide concentration prediction module, which is used to predict the carbon monoxide concentration of each sub - region at the next cycle time point according to the historical detection data of the carbon monoxide sensor group; A unit start - stop control module, which is used to control the start of the exhaust and smoke extraction fan unit according to the prediction result of the carbon monoxide concentration, and control the shutdown of the exhaust and smoke extraction fan unit according to the detection result of the temperature sensor after the exhaust and smoke extraction fan unit is started; The method for predicting the carbon monoxide concentration of each sub - region at the next cycle time point according to the historical detection data of the carbon monoxide sensor group is as follows: Establish a prediction fitting model: j ∈ [1, M]; Among them, represents the predicted value of the carbon monoxide concentration in the jth sub-region at the nth cycle time point, gc i (n - 1) represents the detected value of the carbon monoxide concentration of the carbon monoxide sensor in the ith sub-region at the (n - 1)th cycle time point, a i,j represents the weight of the ith sub-region when predicting the carbon monoxide concentration in the jth sub-region, b j represents the prediction bias of the jth sub-region, and M represents the total number of the sub-regions; Conduct experiments in an actual garage, record the carbon monoxide concentration detection values of the carbon monoxide sensors in each of the sub-regions at each cycle point, and perform parameter fitting on the prediction fitting model to obtain a i,j and b j ; The method for controlling the shutdown of the exhaust and smoke extraction fan unit according to the detection result of the temperature sensor is as follows: Periodically obtain the detection values of all the temperature sensors; If the detection value of the temperature sensor in the j - th sub - region at the current time point reaches the preset temperature threshold, then obtain the first shutdown time of the first exhaust and smoke extraction fan to be shut down and the second shutdown time of the most recently shut - down exhaust and smoke extraction fan; Determine the shutdown time of the exhaust and smoke extraction fan in the j - th sub - region according to the first shutdown time and the second shutdown time; The method for determining the shutdown time of the exhaust and smoke extraction fan in the j - th sub - region according to the first shutdown time and the second shutdown time is as follows: Obtain the reference time τ: Where t1 and t2 are the first shutdown time and the second shutdown time respectively, and the unit is seconds, e is the natural constant, μ is the empirical bias, and ω is the empirical coefficient; If τ > 0, then shut down the exhaust and smoke extraction fan in the j - th sub - region τ seconds after the current time point, otherwise immediately shut down the exhaust and smoke extraction fan in the j - th sub - region.

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

3. An intelligent control system for group exhaust and smoke exhaust in a garage, as claimed in claim 1, wherein The least - squares method or the gradient - descent method is used for the parameter fitting.

4. An intelligent control system for group exhaust and smoke exhaust in a garage, as claimed in claim 3, wherein The method for controlling the start of the exhaust and smoke extraction fan unit according to the prediction result of the carbon monoxide concentration is as follows: Judge whether the predicted value of the carbon monoxide concentration in the j - th sub - region at the next cycle time point exceeds the preset carbon monoxide concentration threshold; If so, control the start of the exhaust and smoke extraction fan unit in the j - th sub - region, otherwise do nothing.

5. An intelligent control system for group exhaust and smoke exhaust in a garage, according to claim 1, characterized in that The preset temperature threshold is 280 degrees Celsius.

6. The intelligent control system for group exhaust and smoke exhaust in a garage according to claim 1, characterized in that, After controlling the shutdown of all the exhaust and smoke extraction fan units according to the detection result of the temperature sensor, remote warning is carried out.

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