Roof greening ventilation irrigation system

Abstract

The invention relates to the technical field of roof greening irrigation, in particular to a roof greening ventilation irrigation system which comprises a monitoring module, a trend analysis module, a control module and an irrigation module. The monitoring module is used for collecting soil humidity in each planting area; the trend analysis module is configured to generate a soil humidity change curve of each planting area after rainfall or irrigation, compare the soil humidity change curve with a prefabricated standard curve, and judge whether the difference between the two curves is within an allowable range; the control module outputs an irrigation instruction for the corresponding planting area or an air deflector angle adjusting and fan starting instruction based on the judgment result until the curve difference is within the allowance range; by introducing an intelligent control mechanism based on humidity change trend analysis, the dynamic moisture state of the plant root zone can be automatically judged according to the humidity change rule after irrigation or rainfall, and the humidity change trend is actively corrected through cooperative control of ventilation and irrigation, so that the irrigation adaptability and stability of the roof greening system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roof greening irrigation, and in particular to a roof greening ventilation irrigation system. BACKGROUND

[0002] Roof planting can effectively improve the urban greening level, alleviate the urban heat island effect, and improve the building insulation performance to some extent. However, the roof planting environment is affected by multiple factors such as climate, structure and drainage conditions, and the timeliness and effectiveness of irrigation and the real-time monitoring capability of the planting state are crucial. Once the irrigation is delayed or the monitoring is failed, it often leads to plant root drying or water accumulation, and the remediation process is complex and the effect is limited.

[0003] To solve the above technical problems, for example, Chinese patent publication No. CN120836332A discloses a green ecological energy-saving irrigation roof system and its use method, which relates to the technical field of building roof. The green ecological energy-saving irrigation roof system comprises a root-resistant waterproof layer, a blind ditch structure layer, a non-woven fabric filter layer, a planting layer and a vegetation layer arranged on the roof from bottom to top. The blind ditch structure layer is provided with a rainwater collecting device, the planting layer is provided with an irrigation device, the rainwater collecting device is communicated with a water storage tank, and the water storage tank is communicated with the irrigation device through a water pump. The planting layer is provided with a soil humidity sensor, and the soil humidity sensor and the water pump are connected with a controller. The system also includes a solar power supply device for supplying power to the water pump, the soil humidity sensor and the controller.

[0004] However, the above scheme is mainly based on single-point humidity threshold triggering, and cannot reflect the change trend of different plant root zone humidity, making it difficult to identify the soil moisture dynamic process after irrigation or rainfall, and further leading to the lack of adaptability of irrigation and affecting the irrigation effect. SUMMARY

[0005] Therefore, the present application provides a roof greening ventilation irrigation system to solve the problem that the prior art is mainly based on single-point humidity threshold triggering, and cannot reflect the change trend of different plant root zone humidity, making it difficult to identify the soil moisture dynamic process after irrigation or rainfall, and further leading to the lack of adaptability of irrigation and affecting the irrigation effect.

[0006] To achieve the above purpose, the present application provides a roof greening ventilation irrigation system, which comprises an overhead layer and a planting layer arranged in sequence from bottom to top on a roof structure layer. One side of the overhead layer is provided with a plurality of fans for forcibly replacing the air in the overhead layer. The overhead layer is also provided with a plurality of adjustable angle air deflectors, each air deflector corresponding to a single planting area in the planting layer. The system also comprises a monitoring module, a trend analysis module, a control module and an irrigation module. The monitoring module is configured to collect soil humidity in various planting areas; the trend analysis module is configured to generate a change curve of soil humidity in various planting areas after rainfall or irrigation, and compare the change curve with a pre-prepared standard curve to determine whether the difference between the two is within a tolerance range; the control module is configured to output an irrigation instruction, or a vane angle adjustment instruction and a fan start instruction for the corresponding planting area in response to the difference between the curve of any planting area and the tolerance range, until the difference between the curve is within the tolerance range; and the irrigation module is configured to receive the irrigation instruction of the control module to irrigate the corresponding planting area.

[0007] As a preferred technical solution of the roof greening ventilation irrigation system, the fan sends air in the horizontal direction of the overhead layer, and the vane is parallel to the horizontal direction in the normal state, and the vane is inclined clockwise relative to the normal state to guide the air sent by the fan to the corresponding planting area and adjust the soil humidity change trend of the planting area under the vane angle adjustment instruction.

[0008] As a preferred technical solution of the roof greening ventilation irrigation system, the trend analysis module has a standard curve library of different types of plants, and the standard curve library includes a standard curve with a time point after each rainfall or irrigation as a starting point of the horizontal coordinate, and a soil humidity after different rainfall or irrigation as a starting point of the vertical coordinate. The trend analysis module obtains the time point after rainfall or irrigation and the soil humidity after rainfall or irrigation of the planting area, and calls the corresponding standard curve from the standard curve library based on the two to compare.

[0009] As a preferred technical solution of the roof greening ventilation irrigation system, the trend analysis module is configured to perform the following steps to determine whether the curve difference is beyond the tolerance range: Within a preset time interval after rainfall or irrigation, the monitoring curve and the standard curve are sampled at the same time resolution to obtain a set of soil humidity data points corresponding to the time sequence; The difference sequence is calculated for each corresponding sampling point of the monitoring curve and the standard curve; The average deviation and the maximum deviation of the difference sequence are calculated and compared with the corresponding threshold value respectively, and the comparison result is determined to be beyond or within the tolerance range, and if the tolerance range is exceeded, it is further determined that the humidity reduction trend is too large or the humidity reduction trend is too small.

[0010] As a preferred technical scheme of the roof greening ventilation irrigation system, the control module executes the following control process in response to the determination result of the trend analysis module that the humidity reduction trend is small: When the average deviation of the difference value sequence is less than or equal to a preset threshold, an angle adjustment instruction of the deflector is output, so that the corresponding deflector is deflected clockwise to a first angle range relative to a normal horizontal position; When the average deviation of the difference value sequence is greater than the preset threshold, the angle adjustment instruction of the deflector and the fan speed increasing instruction are output simultaneously, so that the deflector is deflected to a second angle range and the fan speed is increased correspondingly; Wherein, the second angle range is greater than the first angle range, and the deflection angle of the deflector does not exceed 90°.

[0011] As a preferred technical scheme of the roof greening ventilation irrigation system, the control module outputs an irrigation instruction for the corresponding planting area in response to the determination result of the trend analysis module that the humidity reduction trend is large, controls the irrigation module to irrigate in an intermittent and quantitative manner, reacquires the humidity data of the planting area after each irrigation and updates the monitoring curve, and automatically stops irrigation when the difference between the updated monitoring curve and the standard curve returns to the tolerance range.

[0012] As a preferred technical scheme of the roof greening ventilation irrigation system, the monitoring module is further configured to collect the temperatures of the planting layer, the overhead layer and the outdoor environment respectively.

[0013] As a preferred technical scheme of the roof greening ventilation irrigation system, the control module further has the following irrigation control process: During the day, the fan and the irrigation module are kept off; At night, the control module reads the temperatures of the planting layer, the overhead layer and the outdoor environment; when it is determined that the temperature of the planting layer is greater than that of the overhead layer: The irrigation module is controlled to irrigate the planting layer, and the control module compares the temperature of the planting layer and the temperature of the outdoor environment; when and only when the temperature of the outdoor environment is less than that of the planting layer, the fan is started to cool down.

[0014] As a preferred technical scheme of the roof greening ventilation irrigation system, when the control module determines that the temperature of the planting layer is less than or equal to the temperature of the outdoor environment, the operation of the fan and the irrigation module is stopped.

[0015] As a preferred technical scheme of the roof greening ventilation irrigation system, the side of the overhead layer opposite to the fan is provided with a plurality of ventilation holes to form a ventilation cavity in the overhead layer.

[0016] Compared with the prior art, the application has the beneficial effects that, by introducing an intelligent control mechanism based on humidity change trend analysis, dynamic, accurate and adaptive adjustment of the soil humidity of the roof planting layer is realized.

[0017] The whole system can automatically determine the water dynamic state of the plant root zone according to the humidity change law after irrigation or rainfall, and actively correct the humidity change trend through the coordinated control of ventilation and irrigation, thereby significantly improving the irrigation adaptability and stability of the roof greening system.

[0018] Further, through the linkage of the trend analysis module and the control module, the system has self-learning and self-correction capabilities based on time series data; through the angle adjustment mechanism of the wind deflector and the fan, the auxiliary influence of air flow on the humidity change process is introduced, so that the irrigation adjustment is no longer limited to water supply, but also takes into account the humidity distribution uniformity; through the matching of the standard curve library and the real-time monitoring data, differentiated control logic for different plant types and different climate periods is realized, thereby improving the applicability and universality of the system; through temperature monitoring and the introduction of night operation strategy, the ventilation and irrigation behavior is coordinated with the diurnal heat exchange law, and the energy saving and the plant root zone comfort are taken into account.

[0019] Especially, the application no longer uses a single-point humidity threshold as a control basis, but converts the humidity change process after irrigation or rainfall into a continuous curve and compares it with a standard curve. By analyzing the average deviation and maximum deviation between the monitoring curve and the standard curve, it can be determined whether the water change in the plant root zone deviates from the normal trend. This way can more truly reflect the absorption and evaporation process of water in the soil, avoid misjudgment caused by instantaneous humidity fluctuations, and thus realize more stable and gradual humidity control.

[0020] Especially, the application sets an adjustable-angle wind deflector in the overhead layer, and when the humidity reduction trend is small, the wind deflector angle and the fan speed are adjusted by the control module. The principle is to strengthen or weaken the air exchange between the overhead layer and the planting layer by changing the incident direction and speed of the airflow, thereby indirectly affecting the soil evaporation rate. When the humidity reduction trend is small, the wind deflector angle is increased and the wind speed is increased to accelerate the airflow to take away part of the water vapor; on the contrary, when the humidity reduction trend is large, the airflow is suspended or slowed down to prevent excessive evaporation.

[0021] Especially, the trend analysis module of the application is pre-prepared with multiple standard curves, respectively corresponding to different plant categories, different irrigation time points and initial humidity conditions. By matching the current rainfall or irrigation end time and real-time humidity value, the system automatically selects the closest standard curve for comparison to ensure the pertinence of the judgment basis.

[0022] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The purposes and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. The drawings are intended for illustrative purposes, and therefore are not to scale.

[0024] Figure 1 It is a structural diagram of the roof greening ventilation and irrigation system of the embodiment of the present application; Figure 2 It is a structural diagram of the roof greening ventilation and irrigation system of the embodiment of the present application; Figure 3 It is a structural diagram of the air deflector layout of the embodiment of the present application; In the figure: 1, planting module; 2, soil; 3, overhead layer; 4, fan; 5, soil surface irrigation pipe network; 6, micro water pump; 7, rainwater storage tank; 8, solar photovoltaic panel; 9, storage battery; 10, upper computer; 11, outdoor air temperature sensor; 12, soil temperature sensor; 13, roof structure layer temperature sensor; 14, soil humidity sensor; 15, roof structure layer; 16, air deflector. DETAILED DESCRIPTION

[0025] In order to make the objects and advantages of the present application clearer, the present application will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein merely serve to explain the present application and do not limit the present application.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “connecting” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] For a better understanding of the present application, please refer to Figure 2 As shown in the drawings, the embodiment first provides an ecological heat insulation roof based on solar energy storage and greening integration, which comprises a planting module 1, which is a container with an open top; soil 2, which is laid inside the planting module 1 and serves as a planting layer for plant growth. An air layer 3 is formed between the bottom of the planting layer and the top surface of the roof structure layer 15, constituting a ventilation cavity; a fan 4 is installed on one side of the air layer 3 for forced replacement of air in the air layer 3; The irrigation module of the embodiment comprises a rainwater storage tank 7 for collecting and storing rainwater; A soil surface irrigation pipe network 5 is laid at the upper end of the soil 2; A micro water pump 6 is connected to the rainwater storage tank 7 at the inlet and to the soil surface irrigation pipe network 5 at the outlet, for providing irrigation power.

[0029] In addition, a solar photovoltaic panel 8 is used to convert solar energy into electrical energy; A storage battery 9 is connected to the solar photovoltaic panel 8 for storing electrical energy and providing power for the upper computer 10 and the execution components at night. The control module and the trend analysis module are integrated in the upper computer 10, The monitoring module of the embodiment comprises an outdoor air temperature sensor 11 for monitoring the outdoor ambient temperature; A soil temperature sensor 12 is arranged in the planting layer for monitoring the soil temperature; A roof structure layer temperature sensor 13 is installed on the top layer of the roof structure layer 15 for monitoring the temperature of the air layer close to the roof; A soil moisture sensor 14 is arranged in the planting layer and electrically connected to the upper computer for monitoring the real-time soil moisture. The soil moisture sensor is configured with multiple for different planting areas, Figure 2 Only one is shown for illustration.

[0030] On the basis of the above roof structure, please refer to Figure 2 As shown in the drawings, Figure 1 and Figure 3 The embodiment provides a roof greening ventilation irrigation system, which comprises a plurality of adjustable angle wind deflectors 16 arranged in the air layer, each wind deflector corresponding to a single planting area in the planting layer, as well as a monitoring module, a trend analysis module, a control module and an irrigation module. The monitoring module is configured to collect soil humidity in various planting areas; the trend analysis module is configured to generate a change curve of the soil humidity in various planting areas after rainfall or irrigation, and compare the change curve with a pre-prepared standard curve to determine whether the difference between the two is within a tolerance range; the control module outputs an irrigation instruction, or a vane angle adjustment instruction and a fan start instruction for the corresponding planting area in response to the difference between the curve of any planting area and the tolerance range, until the difference between the curve is within the tolerance range; the irrigation module receives the irrigation instruction of the control module to irrigate the corresponding planting area; the standard curve takes time as the horizontal coordinate and soil humidity as the vertical coordinate, and the standard curve is configured according to the time when the rainfall or irrigation ends and the different types of plants in the planting area.

[0031] In the above embodiment, the design purpose of the system is to determine the direction and rate of water change in the plant root zone by identifying the change trend of soil humidity, rather than a single instantaneous value, so that the irrigation and ventilation control is more in line with the actual physiological water requirement law of plants. It should be understood that the planting area is distributed in multiple areas, which are divided based on different types of plants planted, and the air ventilation should be provided between the overhead layer and the planting layer, not completely isolated.

[0032] In detail, the fan sends air in the horizontal direction in the overhead layer, and the vane is parallel to the horizontal direction in the normal state. Under the vane angle adjustment instruction, the vane is inclined clockwise relative to the normal state to guide the air sent by the fan to the corresponding planting area and adjust the change trend of the soil humidity in the planting area. By controlling the inclination angle of different vanes, the dynamic switching of the airflow path in the overhead layer can be realized, so as to adjust the air flow and airflow direction of the corresponding area according to the real-time temperature and humidity sensing signals of various planting areas, so as to realize fine control of the change trend of the soil humidity in different planting areas. The power output device for adjusting the angle of the vane in this embodiment is realized by an electric push rod or a stepping motor, and the control unit thereof is electrically connected with the control module to receive the vane angle adjustment instruction. Of course, the control unit of the fan is also electrically connected with the control module.

[0033] Specifically, the trend analysis module has a standard curve library of different types of plants, which includes a standard curve with a starting point of the time when each rainfall ends or the time when irrigation ends as the horizontal coordinate, and a starting point of the soil humidity after different rainfall or irrigation ends as the vertical coordinate. The trend analysis module obtains the time after rainfall or irrigation ends and the soil humidity after rainfall or irrigation ends in the planting area and calls the corresponding standard curve from the standard curve library based on the two for comparison.

[0034] Exemplarily, the establishment steps of the standard curve library include: In multiple experiments or historical monitoring, the data sequence of soil moisture change over time after natural precipitation or artificial irrigation is recorded for different plant categories (e.g. herbaceous plants, shrubs, shallow-rooted plants, and deep-rooted plants, etc.); The time point at which each precipitation or irrigation ends is set as the starting point t0 of the horizontal coordinate, and the soil moisture value at the corresponding time point is set as the starting point H0 of the vertical coordinate; Based on this reference point, the humidity change rate in the subsequent time (obtained by continuous monitoring of the soil moisture sensor) is normalized to form a humidity decay curve or a humidity recovery curve; The standard curve representing the typical humidity change characteristics of the plant category is obtained by smoothing and feature extraction of multiple experimental curves. In implementation, a curve subset containing various environmental conditions (different light intensities, air temperatures, and substrate types) can be established for the standard curve library, and dynamic matching can be performed according to real-time environmental parameters during system operation.

[0035] The trend analysis module obtains the single-day time point t1 at which the precipitation or irrigation ends for various planting areas and the soil moisture H1 corresponding to the time point, and calls the corresponding standard curve from the standard curve library as the retrieval parameters.

[0036] Specifically, the trend analysis module is configured to perform the following steps to determine whether the curve difference exceeds the tolerance range: Within a preset time interval after the rainfall or irrigation ends, the monitoring curve and the standard curve are sampled at the same time resolution to obtain a set of soil moisture data points corresponding to the time sequence; The difference sequence is calculated for each corresponding sampling point of the monitoring curve and the standard curve; The average deviation and the maximum deviation of the difference sequence are calculated and compared with the corresponding threshold values, respectively, based on the comparison result to determine whether it exceeds or is within the tolerance range, and if it exceeds the tolerance range, it is further determined whether the humidity reduction trend is too large or too small.

[0037] In detail, within a preset time interval after the rainfall or irrigation ends, the trend analysis module will sample the monitoring curve and the standard curve synchronously at a fixed time resolution to obtain a set of soil moisture data points corresponding to the time sequence. The monitoring curve is M(t), the standard curve is S(t), and the time sampling interval is Δt. At each time point ti (i∈[1,N]), the soil moisture values M(ti) and S(ti) are extracted from the monitoring curve and the standard curve, respectively; For each corresponding sampling point ti of the monitoring curve and the standard curve, the difference sequence is calculated: ΔH(ti)=∣M(ti)-S(ti)∣, where ΔH(ti) is the soil moisture difference value at time point ti.

[0038] After obtaining the difference sequence, the trend analysis module calculates the following two deviation indicators respectively: average deviation: the average value of each ΔH(ti), maximum deviation: the maximum value in each ΔH(ti); Compare them with the corresponding threshold values respectively to determine whether they are within the allowable range. The setting of the respective threshold values should be combined with the actual scene and at least consider the plant type and soil type. For example, in the scene of this embodiment, the sand soil and the herbaceous plant, the threshold value of the average deviation is set to 0.06, and the threshold value of the maximum deviation is set to 0.1. Of course, the threshold value is set to exceed the threshold value after the growth anomaly, which can be set by empirical data.

[0039] Specifically, in response to the determination result of the trend analysis module that the humidity reduction trend is small, the control module executes the following control process: When the average deviation of the difference sequence is less than or equal to the preset threshold value, output the deflector angle adjustment instruction to make the corresponding deflector deflect clockwise relative to the normal horizontal position to the first angle range (25°-45°); When the average deviation of the difference sequence is greater than the preset threshold value, output the deflector angle adjustment instruction and the fan speed increasing instruction at the same time to make the deflector deflect to the second angle range (45°-80°) and correspondingly increase the fan speed; Wherein, the second angle range is greater than the first angle range, and the deflection angle of the deflector does not exceed 90°. In this embodiment, the preset threshold value is 0.1, which is used to quantitatively distinguish and select different humidity adjustment measures in combination with the scene setting. Of course, it should be greater than the threshold value of the corresponding average deviation. Through the above control process, the system can intelligently adjust the environmental conditions to adapt to different soil humidity states, thereby realizing accurate water management and ensuring the healthy growth of plants.

[0040] Specifically, in response to the determination result of the trend analysis module that the humidity reduction trend is large, the control module outputs the irrigation instruction for the corresponding planting area to control the irrigation module to irrigate in an intermittent and quantitative manner. After each irrigation, the humidity data of the planting area is reacquired and the monitoring curve is updated. When the difference between the updated monitoring curve and the standard curve returns to the allowable range, the irrigation is automatically stopped.

[0041] Specifically, the monitoring module is further configured to collect the temperature of the planting layer, the overhead layer and the outdoor environment respectively. On the basis of the above embodiment, in order to further ensure the irrigation effect, for the high-temperature summer scene, considering that the solar photovoltaic panel is currently used to drive the fan to ventilate the overhead layer during the day and drive the water pump to irrigate the soil with the water in the rainwater collection tank. But its daytime ventilation logic is counterproductive: the outdoor air temperature in summer is much higher than the soil temperature during the day, at this time, ventilation not only cannot cool down, but also increases the soil temperature and increases the cooling load of the roof. And ignores the problem of night reverse heat transfer caused by the high thermal inertia of the soil, that is, the heat stored during the day is transferred into the room in reverse at night. Therefore, for the above scenario, the control module further has the following irrigation control process: The fan and the irrigation module are kept closed during the day; The control module reads the temperature of the planting layer, the overhead layer and the outdoor environment at night; when it is determined that the temperature of the planting layer is greater than that of the overhead layer: Control the irrigation module to irrigate the planting layer, and at the same time, the control module compares the temperature of the planting layer and the outdoor environment, and starts the fan to cool down only when the outdoor environment temperature is less than the temperature of the planting layer. When the control module determines that the temperature of the planting layer is less than or equal to the outdoor environment temperature, stop the operation of the fan and the irrigation module. Effectively prevent the roof heat storage from transferring to the room at night, significantly reduce the night air conditioning energy consumption.

[0042] It should be understood that the above irrigation control process is not used for the irrigation of a single planting area based on trend analysis, and the intermittent quantitative irrigation is only carried out after the irrigation of the entire planting layer is completed or after the rain is over.

[0043] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0044] The above is only the preferred embodiment of the present application, and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A roof greening ventilation and irrigation system, comprising an elevated layer and a planting layer arranged sequentially from bottom to top on a roof structural layer, wherein a plurality of fans are arranged on one side of the elevated layer for forced replacement of the air within the elevated layer, characterized in that, The roof greening ventilation and irrigation system also includes several adjustable-angle air guides configured on the elevated layer, each corresponding to a single planting area within the planting layer, and further includes: The monitoring module is used to collect soil moisture data in each planting area; The trend analysis module is configured to generate soil moisture change curves for each planting area after rainfall or irrigation, and compare them with a pre-made standard curve to determine whether the difference between the two is within the allowable range. The control module, in response to any curve difference in any planting area exceeding the tolerance range, outputs an irrigation command for the corresponding planting area, or a wind deflector angle adjustment command and a fan start command, until the curve difference is within the tolerance range; The irrigation module receives irrigation instructions from the control module and irrigates the corresponding planting area; The standard curve is plotted with time on the horizontal axis and soil moisture on the vertical axis, and the standard curve is configured according to the time when rainfall or irrigation ends and the different types of plants in the planting area. The air guide plate angle adjustment command and the fan start command are respectively output to the power output device of the air guide plate and the fan for response and execution.

2. The roof greening ventilation and irrigation system according to claim 1, characterized in that, The fan delivers air horizontally in the elevated layer. The air guide plate is parallel to the horizontal direction in the normal state. Under the air guide plate angle adjustment command, the air guide plate tilts clockwise relative to the normal state to direct the air delivery of the fan to the corresponding planting area and thus adjust the soil moisture change trend of the planting area.

3. The roof greening ventilation and irrigation system according to claim 2, characterized in that, The trend analysis module has a pre-built standard curve library for different types of plants. The standard curve library includes standard curves with the time after each rainfall or irrigation as the starting point of the horizontal axis, and the soil moisture after different rainfall or irrigation as the starting point of the vertical axis. The trend analysis module obtains the time after rainfall or irrigation in the planting area and the soil moisture after rainfall or irrigation, and calls the corresponding standard curve from the standard curve library for comparison based on the two.

4. The roof greening ventilation and irrigation system according to claim 3, characterized in that, The trend analysis module is configured to perform the following steps to determine whether the curve difference exceeds the allowable range: Within a preset time interval after rainfall or irrigation, the monitoring curve and the standard curve are sampled at the same time resolution to obtain a set of soil moisture data points for the corresponding time series. Calculate the difference sequence for each corresponding sampling point of the monitoring curve and the standard curve; The average deviation and maximum deviation of the difference sequence are calculated and compared with the corresponding thresholds respectively. Based on the comparison results, it is determined whether the deviation exceeds or is within the tolerance range. If the deviation exceeds the tolerance range, it is further determined whether the humidity reduction trend is too large or too small.

5. The roof greening ventilation and irrigation system according to claim 4, characterized in that, In response to the trend analysis module's determination that the humidity reduction trend is relatively small, the control module executes the following control process: When the average deviation of the difference sequence is less than or equal to a preset threshold, an air guide plate angle adjustment command is output to make the corresponding air guide plate deflect clockwise relative to the normal horizontal position to the first angle range. When the average deviation of the difference sequence is greater than the preset threshold, the guide vane angle adjustment command and the fan speed increase command are output simultaneously, so that the guide vane deflects to the second angle range and the fan speed is increased accordingly. Wherein, the second angle range is greater than the first angle range, and the deflection angle of the air guide plate does not exceed 90°.

6. The roof greening ventilation and irrigation system according to claim 4, characterized in that, The control module responds to the trend analysis module's determination that the humidity is decreasing significantly, and outputs an irrigation command for the corresponding planting area. It controls the irrigation module to irrigate in an intermittent, quantitative manner. After each irrigation, the humidity data of the planting area is reacquired and the monitoring curve is updated. When the difference between the updated monitoring curve and the standard curve returns to the tolerance range, the irrigation is automatically stopped.

7. The roof greening ventilation and irrigation system according to claim 1, characterized in that, The monitoring module is also configured to collect the temperatures of the planting layer, the overhead layer, and the outdoor environment, respectively.

8. The roof greening ventilation and irrigation system according to claim 7, characterized in that, The control module also includes the following irrigation control process: The fan and irrigation module should be kept off during the day; At night, the control module reads the temperatures of the planting layer, the overhead layer, and the outdoor environment; when it determines that the temperature of the planting layer is greater than the temperature of the overhead layer: The control module irrigates the planting layer. At the same time, the control module compares the temperature of the planting layer with the outdoor ambient temperature, and starts the fan to cool down the planting layer only when the outdoor ambient temperature is lower than the temperature of the planting layer.

9. The roof greening ventilation and irrigation system according to claim 8, characterized in that, When the control module determines that the temperature of the planting layer is less than or equal to the outdoor ambient temperature, it stops the operation of the fan and irrigation module.

10. The roof greening ventilation and irrigation system according to claim 1, characterized in that, The side of the elevated floor opposite the fan is provided with several ventilation holes to form a ventilation cavity in the elevated floor.

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