A vehicle base shaft chimney effect intelligent combined ventilation system based on an upper cover development

Abstract

The application discloses a vehicle base vertical shaft chimney effect intelligent combined ventilation system based on an upper cover, belongs to the technical field of vehicle base ventilation, and comprises a mechanical ventilation device, further comprises a pre-value analysis module, a regional division unit, a shaft ventilation analysis module, a combined control module and a machine ventilation control and adjustment unit. The combined judgment value is obtained by comprehensively analyzing and calculating the total flux value and the base ventilation judgment value, whether to start the mechanical ventilation is determined according to the comparison between the combined judgment value and the combined judgment threshold value, and the machine ventilation control and adjustment unit is used for flexible control after the mechanical ventilation is started, so that the efficiency of the mechanical ventilation used in the vehicle base and matched with the natural ventilation of the building vertical shaft is higher, the energy consumption of the mechanical ventilation system is further controlled, and the electric power energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle base ventilation, in particular to a vehicle base vertical shaft chimney effect intelligent combined ventilation system based on an upper cover. BACKGROUND

[0002] The building ventilation shaft is an important structure inside the building, which can be used as an air flow channel to discharge indoor dirty air from the building interior when ventilation is needed. This ventilation method helps to improve the air quality inside the building, reduce the feeling of dampness and stuffiness, and provide a healthier and more comfortable environment for users.

[0003] However, since the ventilation principle of the building shaft is basically the chimney effect, the ventilation effect of the building shaft depends on the environmental difference between the vehicle base interior and the outside world. The existing technology lacks comprehensive monitoring and analysis of the building shaft, making it difficult to evaluate its ventilation effect and to achieve linkage with the mechanical ventilation equipment in the existing technology, resulting in poor combined ventilation effect and affecting the efficiency and energy consumption of the mechanical ventilation equipment. SUMMARY

[0004] The purpose of the present application is to solve the problem of poor combined ventilation effect caused by the difficulty of linkage between the building shaft and the mechanical ventilation equipment in the prior art, and to propose a vehicle base vertical shaft chimney effect intelligent combined ventilation system based on an upper cover.

[0005] The purpose of the present application can be achieved by the following technical solution: a vehicle base vertical shaft chimney effect intelligent combined ventilation system based on an upper cover, comprising a mechanical ventilation equipment, further comprising a pre-value analysis module, a region division unit, a shaft ventilation analysis module, a combined control module, and a mechanical ventilation control and adjustment unit:

[0006] The pre-value analysis module obtains the number of all building shafts in the vehicle base and the depth and cross-sectional area of each building shaft, and each building shaft is denoted as SJ i , where i is the serial number of each building shaft, the vehicle base building design blueprint is obtained and the position of each building shaft is marked in the building design blueprint, the building shaft position is analyzed and processed to obtain the region reference value and the shaft ventilation shielding value, and the region reference value, the shaft ventilation shielding value, the depth and the cross-sectional area of each building shaft are substituted into a preset formula to obtain the shaft ventilation pre-parameter value of each building shaft.

[0007] The shaft ventilation analysis module obtains the temperature and wind speed of the upper and lower shaft openings of each building shaft and the wind speed and direction inside the building shaft to calculate and analyze the shaft ventilation judgment value δ' reflecting the ventilation condition of all building shafts.

[0008] The combined control module obtains the spatial size of each independent mechanical ventilation area and the cross-sectional area of ​​each building shaft, draws the wind speed change curve in each building shaft over time, and calculates the total flux value ε′ based on the curve analysis. The total flux value ε′ and the basic flux judgment value δ′ are calculated to obtain the combined judgment value α, and a combined judgment threshold α′ is set. The combined judgment value α is compared with the combined judgment threshold α′. When the combined judgment value is less than the combined judgment threshold, a start-up mechanical ventilation instruction is generated and sent to the mechanical ventilation equipment, and the mechanical ventilation control unit controls the operating power of the mechanical ventilation equipment. Otherwise, no start-up mechanical ventilation instruction is generated.

[0009] As a preferred embodiment of the present invention, the specific process of the pre-value analysis module analyzing and processing the building shaft position is as follows:

[0010] The pre-value analysis module divides the building design blueprint into three areas through the regional division unit, namely the core area, the general area, and the edge area. i The area in the building design blueprint assigns a regional reference value to each building shaft. When a building shaft is located in the core area of ​​the building layout, its regional reference value is assigned to 3; when a building shaft is located in the ordinary area of ​​the building layout, its regional reference value is assigned to 2; when a building shaft is located in the edge area of ​​the building layout, its regional reference value is assigned to 1. Obtain the building plan layout, draw a reference circle with a radius of r1 with the center point of each building shaft as the center, r1 is a preset value, calculate the proportion of building coverage area above the upper wellhead of the building shaft within each reference circle, and obtain the well obstruction value ZD corresponding to each building shaft. i , the regional reference value QY of each building shaft i , Well occlusion value ZD i , Depth SD i And the cross-sectional area MJ i Substitute into the preset formula Calculate and obtain the JD value of the shaft clearance corresponding to each building shaft i , where λ1 and λ2 are preset weight factors, and the depth SD i And the cross-sectional area MJ i The values ​​are normalized.

[0011] As a preferred embodiment of the present invention, the specific division process of the area division unit is as follows:

[0012] The mechanical ventilation area of ​​the entire vehicle base is divided into multiple square areas of equal area as unit areas, a key site is set, the distance between the center point of each unit area and the key site is calculated and recorded as the key distance value, a core distance threshold is set, and the unit area with a key distance value less than or equal to the core distance threshold is marked as the first core area. A circle with a radius of r2 is drawn with the center point of each unit area as the center and recorded as the area judgment circle. R2 is a preset value. The number of walls and the total length of the walls within the range of each area judgment circle are calculated, and the unit wall value is calculated by substituting it into the formula unit wall value = number of walls + total length of walls / k1, where k1 is a preset value. Set a Unit wall threshold. When the unit wall value is greater than the unit wall threshold, the unit area corresponding to the area judgment circle is marked as the second core area. The outer contour line is marked in the entire vehicle base mechanical ventilation area. An edge distance threshold is set. The edge distance threshold is an integer multiple of the unit area side length. The unit area whose center point is less than or equal to the edge distance threshold from the outer contour line of the mechanical ventilation area is recorded as the edge area. The first core area and the second core area are uniformly recorded as the core area. When the same unit area is marked as both the core area and the edge area, it is marked as the core area first, and all other unmarked unit areas in all unit areas are recorded as ordinary areas.

[0013] As a preferred embodiment of the present invention, the specific calculation process of the well connectivity judgment value of the well connectivity analysis module is as follows:

[0014] The building shaft SJ i The corresponding upper wellhead temperature is recorded as JK i 1 , the wellhead temperature is recorded as JK i 2 , the wind speed at the wellhead is recorded as F i 1 , the wind speed at the wellhead is recorded as F i 2 、The wind speed in the building shaft is recorded as F i 3 , the building shaft SJ i The corresponding upper wellhead temperature JK i 1 , lower wellhead temperature JK i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Temperature parameter influence value The building shaft SJ i The corresponding upper wellhead wind speed F i 1 , Wellhead wind speed F i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Wind parameter influence value Fl i 2 , then extract the current building shaft SJ i Temperature parameter influence value Wind parameter influence value Fl i 2 、Jingtong pre-parameter value JD i and the wind speed F in the building shaft i 3 After normalization, substitute into the formula Calculate and get the current building shaft SJ i Well pass judgment value δ i , where μ1, μ2, μ3, μ4, and k2 are all preset weight coefficients, and the value of k1 is 1 or -1. When the wind direction in the building shaft is from bottom to top, the value of k1 is 1, otherwise, the value of k1 is -1.

[0015] As a preferred embodiment of the present invention, the specific calculation process of the basic pass judgment value of the well pass analysis module is as follows:

[0016] Extract the well access judgment value δ of all building shafts i And substitute into the formula Calculation is performed to obtain the basic pass judgment value δ′, where ρ is a preset parameter factor.

[0017] As a preferred embodiment of the present invention, the analysis and calculation process of the combination judgment value by the combination control module is as follows:

[0018] Set a time range threshold, intercept the last segment of each wind speed change curve with a length equal to the time range threshold, calculate the graphic area between the intercepted curve and the time axis, multiply the graphic area value by the cross-sectional area of ​​the building shaft and record the result as the pre-flux value corresponding to the building shaft, sum the pre-flux values ​​of all shafts and divide them by the total space size of the mechanical ventilation area of ​​the entire vehicle base to obtain the total flux value ε′, normalize the total flux value ε′ and the basic flux judgment value δ′ and substitute them into the formula Calculation is performed to obtain the combined judgment value α, where ω1 and ω2 are both preset weight factors.

[0019] As a preferred embodiment of the present invention, the machine ventilation control unit includes a gear controller electrically connected to the mechanical ventilation equipment, the gear controller has three gears: low, medium and high. The three gears of the gear controller correspond to three load values ​​of the mechanical ventilation equipment respectively.

[0020] As a preferred embodiment of the present invention, the specific control process of the mechanical ventilation equipment by the mechanical ventilation control unit is as follows:

[0021] Get the command generated by the combined control module. When the command to start mechanical ventilation is generated, get the current combined judgment value α and substitute the combined judgment value α into the formula Calculate in and get the machine communication control value Among them, β and Q are preset parameter factors, and three range intervals are set. The combination of the three range intervals covers The three ranges correspond to low, medium and high gears respectively. Each gear corresponds to a preset operating power of a mechanical ventilation device. When it is within one of the range intervals, the operating power of the mechanical ventilation equipment is adjusted to the gear corresponding to the range interval.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Analyze each building shaft in the vehicle base separately, combine its location data and spatial data and substitute them into the formula to calculate the well ventilation pre-parameter value of each building shaft, so as to roughly judge the reference value of the influence of the location and spatial information of each building shaft on its functionality, that is, the well ventilation pre-parameter value. Based on the well ventilation pre-parameter value, the well ventilation analysis module further obtains multiple data such as the temperature and wind speed of the upper and lower wellheads of each building shaft, as well as the wind speed and wind direction in the building shaft, and calculates and analyzes multiple data to obtain environmental parameters from multiple angles. The multiple environmental parameters of each building shaft are combined with its own well ventilation pre-parameter value for calculation and analysis, so as to comprehensively consider various current factors and finally obtain the reference value of the influence of all building shafts on the ventilation conditions of the vehicle base, that is, the base ventilation judgment value. Then, the influence of the building shaft on the ventilation conditions of the vehicle base can be analyzed and judged more intuitively, so as to better judge whether mechanical ventilation is needed, and ultimately achieve the goal of saving electricity resources while ensuring the ventilation quality of the undercover area in the vehicle base.

[0024] 2. The combined control module obtains spatial data of the entire vehicle base and combines it with image analysis to calculate the ventilation volume of each building shaft. This is substituted into the mathematical model formula to calculate the total flux value, which can reflect the exchange of air between the entire vehicle base and the outside world. A combined judgment value is then obtained through comprehensive analysis of the total flux value and the basic ventilation judgment value. The combination judgment value is compared with the combination judgment threshold to determine whether to enable mechanical ventilation. After mechanical ventilation is enabled, the mechanical ventilation control unit flexibly controls it, making the mechanical ventilation used in the vehicle base more efficient in combination with the natural ventilation of the building shafts, further controlling the energy consumption of the mechanical ventilation equipment and reducing power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0026] Figure 1 It is a principle block diagram of the present invention;

[0027] Figure 2 Schematic diagram of the wind speed changing with time curve in the present invention. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] See also Figure 1 As shown, an intelligent combined ventilation system for the chimney effect of the vehicle base shaft developed based on the upper cover includes mechanical ventilation equipment, a pre-value analysis module, a regional division unit, a shaft analysis module, a combined control module, and a machine-communication control and adjustment unit.

[0030] The pre-value analysis module obtains the number of all building shafts in the entire vehicle base, and distinguishes each building shaft by marking it as SJ i , where i is the serial number of each shaft, obtain the vehicle base building plan and mark each building shaft SJ in the building layout i The regional division unit divides the building layout into three areas, namely the core area, the general area, and the edge area. A regional reference value QY is set for each building shaft. i , according to each building shaft SJ i The area in the building layout assigns a regional reference value to each building shaft. When a building shaft is located in the core area of ​​the building layout, its regional reference value is assigned to 3; when a building shaft is located in the ordinary area of ​​the building layout, its regional reference value is assigned to 2; when a building shaft is located in the edge area of ​​the building layout, its regional reference value is assigned to 1. The depth and cross-sectional area of ​​each building shaft are obtained and recorded as SD respectively. i and MJ i , obtain the top view of the building base, draw a reference circle with a radius of r1 with the center point of each building shaft as the center, r1 is a preset value, calculate the proportion of the building coverage area within each reference circle that is higher than the upper wellhead of the building shaft, and record it as the well obstruction value ZD corresponding to each building shaft i , the regional reference value QY of each building shaft i , Well occlusion value ZDi , Depth SD i And the cross-sectional area MJ i Substitute into the preset formula Calculate and obtain the JD value of the shaft clearance corresponding to each building shaft i , where λ1 and λ2 are preset weight factors, and the depth SD i And the cross-sectional area MJ i The values ​​are normalized.

[0031] It should be noted that the location of each building shaft can be known through the general building plan layout of the vehicle base. The building layout of the entire vehicle base can be known through the general building plan layout, so that the core area, general area and edge area can be divided more conveniently. According to the area to which the location of each building shaft belongs, its regional reference value is assigned, and the regional reference value can intuitively show the value of the location of each building shaft to the heat dissipation and ventilation of the vehicle base.

[0032] The area division unit divides the entire vehicle base plan into multiple square areas of equal area as unit areas, sets a key point, and the key point is calibrated by the staff according to the center point of the core position area of ​​the vehicle base. The distance from the center point of each unit area to the key point is calculated and recorded as the key distance value. A core distance threshold is set, and the unit area with a key distance value less than or equal to the core distance threshold is marked as the first core area. A circle with a radius of r2 is drawn with the center point of each unit area as the center and recorded as the area judgment circle. r2 is a preset value. The number of walls and the total length of the walls within the range of each area judgment circle are calculated, and the unit wall value is calculated by substituting it into the formula unit wall value = number of walls + total length of walls / k1. Wall value, where k1 is a preset value, a unit wall threshold is set. When the unit wall value is greater than the unit wall threshold, the unit area corresponding to the area judgment circle is marked as the second core area. The contour line of the mechanical ventilation area of ​​the vehicle base is marked in the entire vehicle base plan. An edge distance threshold is set. The edge distance threshold is an integer multiple of the side length of the unit area. The unit area whose center point is less than or equal to the edge distance threshold from the outer contour line of the vehicle base is recorded as the edge area. The first core area and the second core area are collectively referred to as the core area. When the same unit area is marked as both the core area and the edge area, it is marked as the core area first, and all other unmarked unit areas in all unit areas are recorded as ordinary areas.

[0033] It should be noted that the entire vehicle base plan includes a schematic outline of the internal walls of the vehicle base. The walls inside the mechanical ventilation area of ​​the vehicle base are marked with specific line segments in the vehicle base plan. The number of walls within each area judgment circle can be obtained by the number of line segments representing the walls within the area judgment circle, and the total length of the walls within the area judgment circle can be obtained by multiplying the total length of the line segments representing the walls within the area judgment circle by the drawing ratio of the vehicle base plan.

[0034] The well analysis module obtains the temperature, wind speed, and wind direction of the upper and lower wellheads of each building shaft, and calculates the wind speed and wind direction of the building shaft. i The corresponding upper wellhead temperature is recorded as JK i 1 , the wellhead temperature is recorded as JK i 2 , the wind speed at the wellhead is recorded as F i 1 , the wind speed at the wellhead is recorded as F i 2 、The wind speed in the building shaft is recorded as F i 3 , the building shaft SJ i The corresponding upper wellhead temperature JK i 1 , lower wellhead temperature JK i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Temperature parameter influence value The building shaft SJ i The corresponding upper wellhead wind speed F i 1 , Wellhead wind speed F i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Wind parameter influence value Fl i 2 , then extract the current building shaft SJ i Temperature parameter influence value Fl i 1 , wind parameter influence value Fl i 2 、Jingtong pre-parameter value JD i and the wind speed F in the building shaft i 3 After normalization, substitute into the formula Calculate and get the current building shaft SJ i Well pass judgment value δ i, where μ1, μ2, μ3, μ4, and k2 are all preset weight coefficients, and the value of k1 is 1 or -1, which is determined by the wind direction in the building shaft. When the wind direction in the building shaft is from bottom to top, the value of k1 is 1, and when the wind direction in the building shaft is from top to bottom, the value of k1 is -1. The well pass judgment value δ of all building shafts is extracted. i And substitute into the formula , and obtain the basic ventilation judgment value δ′, where ρ is a preset parameter factor. The basic ventilation judgment value can indirectly reflect the overall ventilation function of all building shafts in the entire vehicle base. When δ′ is larger, it means that the ventilation of the building shafts of the vehicle base is good. The air inside the base can be exchanged with the outside air more ideally through the building shafts, ensuring the air circulation in the vehicle base and preventing the deterioration of the air quality and oxygen content in the vehicle base caused by long-term air stagnation. When δ′ is smaller, it means that the ventilation of the building shafts of the vehicle base is poor, and there is air stagnation or one-way circulation, which affects the normal circulation and exchange of air between the vehicle base and the outside world, causing the air quality in the vehicle base to deteriorate.

[0035] It should be noted that when the temperature inside the building is higher than the outside, a positive chimney effect will occur, causing the hot air to rise and be discharged through the top of the shaft. On the contrary, when the temperature inside the building is lower than the outside, a reverse chimney effect will occur, and the air flow direction will be opposite. Therefore, by measuring the temperature of the upper and lower wellheads of the building shaft and calculating through a formula, a reference value for judging the impact of temperature on the air circulation in the building shaft can be obtained, that is, the temperature parameter impact value. The greater the temperature parameter impact value, the greater the impact of the upper and lower wellhead temperatures of the building shaft on the exhaust function of the building shaft, and the smaller the temperature parameter impact value, the greater the impact of the upper and lower wellhead temperatures of the building shaft on the suction function of the building shaft. In addition, the wind speed at the upper and lower wellheads of the building shaft will also affect the air circulation in the building shaft. The pressure is low where the flow rate is high, which will cause the flow rate at one end of the upper and lower wellheads of the building shaft to be significantly greater than that at the other end. Negative pressure will be formed at the end with the high air flow rate and air will be sucked in from the other end. Therefore, by measuring the wind speed at the upper and lower wellheads of the building shaft and calculating through the formula, a reference value can be obtained to judge the impact of the wind speed at both ends of the building shaft on the air circulation in the building shaft, that is, the wind parameter influence value. When the wind parameter influence value is larger, it means that the temperature of the upper and lower wellheads of the building shaft has a greater impact on the exhaust function of the building shaft, and when the wind parameter influence value is smaller, it means that the temperature of the upper and lower wellheads of the building shaft has a greater impact on the suction function of the building shaft.

[0036] The combined control module obtains the total space size of the mechanical ventilation area of ​​the entire vehicle base and the cross-sectional area of ​​each building shaft. It should be noted that the total space size can be estimated by multiplying the base area by the base height, and the wind speed curve of each building shaft over time is drawn, such as Figure 2 As shown, a time range threshold is set, the curve with the last segment of the curve being the time range threshold is intercepted and the graphic area between the curve and the time axis is calculated (the shaded part in the figure). The graphic area value is multiplied by the cross-sectional area of ​​the building shaft and the result is recorded as the pre-flux value corresponding to the building shaft. The pre-flux values ​​of all shafts are summed and divided by the total space size of the mechanical ventilation area of ​​the entire vehicle base to obtain the total flux value ε′. The total flux value ε′ and the basic flux judgment value δ′ are normalized and substituted into the formula , a combined judgment value α is obtained, where ω1 and ω2 are preset weight factors. A combined judgment threshold α′ is set, and the combined judgment value α is compared with the combined judgment threshold α′. When the combined judgment value is less than the combined judgment threshold, a mechanical ventilation start instruction is generated and sent to the mechanical ventilation equipment. Mechanical ventilation is achieved through the mechanical ventilation equipment and the operating power of the mechanical ventilation equipment is controlled, so that the air inside the vehicle base circulates and exchanges with the outside world. When the combined judgment value is greater than or equal to the combined judgment threshold, no mechanical ventilation start instruction is generated, and the vehicle base continues to be ventilated through the building shaft.

[0037] The mechanical ventilation control unit obtains the instruction generated by the combination control module. When the mechanical ventilation start instruction is generated, the current combination judgment value α is obtained and the combination judgment value α is substituted into the formula Calculate in and get the machine communication control value Among them, β and Q are preset parameter factors. Three range intervals are set, and the end values ​​of adjacent range intervals are connected so that the three range interval combinations cover The three ranges correspond to the low, medium and high gears respectively. Each gear corresponds to a preset operating power of a mechanical ventilation device. Adjusting to the corresponding gear can control the mechanical ventilation device to run at the preset power. When the temperature is within one of the three ranges, the operating power of the mechanical ventilation equipment is adjusted to the gear corresponding to the range, thereby achieving ventilation within the base.

[0038] It should be noted that the end values ​​of the three adjacent range intervals are connected, which means that if The range of is [0, c), then the three range intervals are [0, a), [a, b), [b, c), where a, b, and c are all constant values.

[0039] When the present invention is in use, the well ventilation pre-parameter value of the building shaft can be obtained by analyzing the position of each building shaft and other spatial factors. Then, the well ventilation pre-parameter value is further calculated and analyzed in combination with the temperature, wind speed of the upper and lower wellheads of each building shaft, and the wind speed and wind direction in the building shaft, to obtain a basic ventilation judgment value that can indirectly reflect the overall ventilation function of all building shafts in the entire vehicle base, so as to judge the ventilation condition of the mechanical ventilation area of ​​the entire vehicle base. In addition, the combined control module can obtain the total space size of the mechanical ventilation area of ​​the entire vehicle base and the cross-sectional area of ​​each building shaft, and perform time series analysis on the wind speed in each building shaft, and calculate the total flux value of the mechanical ventilation area of ​​the entire vehicle base. The total flux value can reflect the air exchange ratio of the mechanical ventilation area of ​​the vehicle base over a period of time. Further analysis and judgment are performed in combination with the total flux value and the basic ventilation judgment value, so as to control the start and stop and operating gear of the mechanical ventilation equipment, so that the mechanical ventilation equipment can timely improve the air circulation and air quality in the vehicle base.

[0040] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover, including mechanical ventilation equipment, characterized in that: It also includes the pre-value analysis module, regional division unit, well communication analysis module, combined control module, and machine communication control and adjustment unit: The pre-value analysis module obtains the number of all building shafts in the entire vehicle base and the depth and cross-sectional area of ​​each building shaft, and records each building shaft as SJ i , where i is the serial number of each building shaft, obtain the vehicle base building design blueprint and mark the location of each building shaft in the building design blueprint, analyze and process the building shaft location to obtain the regional reference value and shaft obstruction value, substitute the regional reference value, shaft obstruction value, depth, and cross-sectional area of ​​each building shaft into a preset formula to obtain the shaft pre-parameter value of each building shaft; The well ventilation analysis module obtains the temperature and wind speed of the upper and lower wellheads of each building shaft, as well as the wind speed and wind direction in the building shaft, and calculates and analyzes to obtain the basic ventilation judgment value δ′ that reflects the ventilation conditions of all building shafts; The combined control module obtains the spatial size of each independent mechanical ventilation area and the cross-sectional area of ​​each building shaft, draws the wind speed change curve in each building shaft over time, and calculates the total flux value ε′ based on the curve analysis. The total flux value ε′ and the basic flux judgment value δ′ are calculated to obtain the combined judgment value α, and a combined judgment threshold α′ is set. The combined judgment value α is compared with the combined judgment threshold α′. When the combined judgment value is less than the combined judgment threshold, a start-up mechanical ventilation instruction is generated and sent to the mechanical ventilation equipment, and the mechanical ventilation control unit controls the operating power of the mechanical ventilation equipment. Otherwise, no start-up mechanical ventilation instruction is generated.

2. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 1 is characterized in that: The specific process of the pre-value analysis module for analyzing the building shaft position is as follows: The pre-value analysis module divides the building design blueprint into three areas through the regional division unit, namely the core area, the general area, and the edge area. i The area in the building layout assigns a regional reference value to each building shaft. When a building shaft is located in the core area of ​​the building layout, its regional reference value is assigned to 3; when a building shaft is located in the ordinary area of ​​the building layout, its regional reference value is assigned to 2; when a building shaft is located in the edge area of ​​the building layout, its regional reference value is assigned to 1. Obtain the building plan layout, draw a reference circle with a radius of r1 with the center point of each building shaft as the center, r1 is a preset value, calculate the proportion of building coverage area above the upper wellhead of the building shaft within each reference circle, and obtain the well obstruction value ZD corresponding to each building shaft. i , the regional reference value QY of each building shaft i , Well occlusion value ZD i , Depth SD i And the cross-sectional area MJ i Substitute into the preset formula Calculate and obtain the JD value of the shaft clearance corresponding to each building shaft i , where λ1 and λ2 are preset weight factors, and the depth SD i And the cross-sectional area MJ i The values ​​are normalized.

3. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 2 is characterized in that: The specific division process of the regional division unit is as follows: The mechanical ventilation area of ​​the entire vehicle base is divided into multiple square areas of equal area as unit areas, a key site is set, the distance between the center point of each unit area and the key site is calculated and recorded as the key distance value, a core distance threshold is set, and the unit area with a key distance value less than or equal to the core distance threshold is marked as the first core area. A circle with a radius of r2 is drawn with the center point of each unit area as the center and recorded as the area judgment circle. R2 is a preset value. The number of walls and the total length of the walls within the range of each area judgment circle are calculated, and the unit wall value is calculated by substituting it into the formula unit wall value = number of walls + total length of walls / k1, where k1 is a preset value. Set a Unit wall threshold. When the unit wall value is greater than the unit wall threshold, the unit area corresponding to the area judgment circle is marked as the second core area. The outer contour line is marked in the entire vehicle base mechanical ventilation area. An edge distance threshold is set. The edge distance threshold is an integer multiple of the unit area side length. The unit area whose center point is less than or equal to the edge distance threshold from the outer contour line of the mechanical ventilation area is recorded as the edge area. The first core area and the second core area are uniformly recorded as the core area. When the same unit area is marked as both the core area and the edge area, it is marked as the core area first, and all other unmarked unit areas in all unit areas are recorded as ordinary areas.

4. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 1 is characterized in that: The specific calculation process of the well connectivity judgment value of the well connectivity analysis module is as follows: The building shaft SJ i The corresponding upper wellhead temperature is recorded as JK i 1 , the wellhead temperature is recorded as JK i 2 , the wind speed at the wellhead is recorded as F i 1 , the wind speed at the wellhead is recorded as F i 2 、The wind speed in the building shaft is recorded as F i 3 , the building shaft SJ i The corresponding upper wellhead temperature JK i 1 , lower wellhead temperature JK i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Temperature parameter influence value Fl i 1 , the building shaft SJ i The corresponding upper wellhead wind speed F i 1 , Wellhead wind speed F i 2 Substitute into the formula Calculate in and get the current building shaft SJ i Wind parameter influence value Fl i 2 , then extract the current building shaft SJ i Temperature parameter influence value Fl i 1 , wind parameter influence value Fl i 2 、Jingtong pre-parameter value JD i and wind speed F in the building shaft i 3 After normalization, substitute into the formula Calculate and get the current building shaft SJ i Well pass judgment value δ i , where μ1, μ2, μ3, μ4, and k2 are all preset weight coefficients, and the value of k1 is 1 or -1. When the wind direction in the building shaft is from bottom to top, the value of k1 is 1, otherwise, the value of k1 is -1.

5. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 4 is characterized in that: The specific calculation process of the basic pass judgment value of the well pass analysis module is as follows: Extract the well access judgment value δ of all building shafts i And substitute into the formula Calculation is performed to obtain the basic pass judgment value δ′, where ρ is a preset parameter factor.

6. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 1 is characterized in that: The analysis and calculation process of the combined judgment value by the combined control module is as follows: Set a time range threshold, intercept the last segment of each wind speed change curve with a length equal to the time range threshold, calculate the graphic area between the intercepted curve and the time axis, multiply the graphic area value by the cross-sectional area of ​​the building shaft and record the result as the pre-flux value corresponding to the building shaft, sum the pre-flux values ​​of all shafts and divide them by the total space size of the entire vehicle base to obtain the total flux value ε′, normalize the total flux value ε′ and the basic flux judgment value δ′ and substitute them into the formula Calculation is performed to obtain the combined judgment value α, where ω1 and ω2 are both preset weight factors.

7. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 6 is characterized in that: The mechanical ventilation control unit includes a gear controller electrically connected to the mechanical ventilation equipment. The gear controller is provided with three gears: low, medium and high. The three gears of the gear controller correspond to three load values ​​of the mechanical ventilation equipment respectively.

8. The intelligent combined ventilation system for vehicle base shaft chimney effect developed based on the upper cover according to claim 7 is characterized in that: The specific control process of the mechanical ventilation equipment by the mechanical ventilation control unit is as follows: Get the command generated by the combined control module. When the command to start mechanical ventilation is generated, get the current combined judgment value α and substitute the combined judgment value α into the formula Calculate in and get the machine communication control value Among them, β and Q are preset parameter factors, and three range intervals are set. The combination of the three range intervals covers The three ranges correspond to low, medium and high gears respectively. Each gear corresponds to a preset operating power of a mechanical ventilation device. When it is within one of the range intervals, the operating power of the mechanical ventilation equipment is adjusted to the gear corresponding to the range interval.

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