A roof greening ventilation irrigation system

Abstract

The application relates to the technical field of roof greening irrigation, in particular to a roof greening ventilation and 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 various planting areas; the trend analysis module is configured to generate a change curve of the soil humidity of 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 curves is within a tolerance range; the control module outputs an irrigation instruction for the corresponding planting area, or a wind vane angle adjustment instruction and a fan starting instruction, based on the determination result, until the curve difference is within the tolerance range; by introducing an intelligent control mechanism based on humidity change trend analysis, the water dynamic state of the plant root area can be automatically determined according to the humidity change law after irrigation or rainfall, and through the collaborative control of ventilation and irrigation, the humidity change trend is actively corrected, so that the irrigation adaptability and stability of the roof greening system are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of roof greening irrigation technology, and more particularly to a roof greening ventilation and irrigation system. Background Technology

[0002] Rooftop planting can effectively improve urban greening levels, alleviate the urban heat island effect, and improve building insulation performance to some extent. However, the rooftop planting environment is affected by multiple factors such as climate, structure, and drainage conditions. The timeliness and effectiveness of irrigation, as well as the ability to monitor the planting status in real time, are crucial. Once irrigation is delayed or monitoring is mishandled, it often leads to the drying out of plant roots or waterlogging, and the remedial process is complex and has limited effect.

[0003] To address the aforementioned technical problems, for example, Chinese Patent Application Publication No. CN120836332A discloses a green, eco-friendly, and energy-saving irrigation roof system and its usage method, relating to the field of building roofing technology. The green, eco-friendly, and energy-saving irrigation roof system includes, from bottom to top, a root-barrier waterproof layer, a blind drain structure layer, a non-woven fabric filter layer, a planting layer, and a vegetation layer installed on the roof. A rainwater collection device is installed within the blind drain structure layer, and an irrigation device is installed on the planting layer. The rainwater collection device is connected to a water storage tank, which is connected to the irrigation device via a water pump. A soil moisture sensor is installed within the planting layer, and both the soil moisture sensor and the water pump are connected to a controller. The system also includes a solar power supply device for powering the water pump, soil moisture sensor, and controller.

[0004] However, the above scheme is mainly based on single-point humidity threshold triggering, which fails to reflect the changing trend of humidity in different plant root zones and makes it difficult to identify the dynamic process of soil moisture after irrigation or rainfall, thus resulting in a lack of adaptability of irrigation and affecting the irrigation effect. Summary of the Invention

[0005] To address this issue, the present invention provides a roof greening ventilation and irrigation system to solve the problem that existing technologies mainly rely on single-point humidity threshold triggering, which fails to reflect the changing trends of humidity in different plant root zones, makes it difficult to identify the dynamic process of soil moisture after irrigation or rainfall, and thus leads to a lack of adaptability in irrigation and affects the irrigation effect.

[0006] To achieve the above objectives, the present invention provides a roof greening ventilation and irrigation system, which includes an elevated layer and a planting layer arranged sequentially from bottom to top on the roof structural layer. A plurality of fans are arranged on one side of the elevated layer for forced replacement of the air in the elevated layer. The system also includes a plurality of adjustable-angle air guides arranged in the elevated layer, each air guide 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.

[0007] The monitoring module collects soil moisture data from 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 is within the allowable tolerance range; the control module responds to any planting area where the curve difference exceeds the allowable tolerance range by outputting an irrigation command for the corresponding planting area, or an air guide angle adjustment and fan start command, until the curve difference is within the allowable tolerance range; the irrigation module receives the irrigation command 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 of end of rainfall or irrigation and the different types of plants in the planting area.

[0008] As a preferred technical solution for the roof greening ventilation and irrigation system, 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 guide the air delivery of the fan to the corresponding planting area and thus adjust the soil moisture change trend of the planting area.

[0009] As a preferred technical solution for roof greening ventilation and irrigation systems, 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.

[0010] As a preferred technical solution for roof greening ventilation and irrigation systems, the trend analysis module is configured to perform the following steps to determine whether the curve difference exceeds the allowable tolerance range:

[0011] 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.

[0012] Calculate the difference sequence for each corresponding sampling point of the monitoring curve and the standard curve;

[0013] 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.

[0014] As a preferred technical solution for a rooftop greening ventilation and irrigation system, the control module, in response to the trend analysis module's determination that the humidity reduction trend is small, executes the following control process:

[0015] 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.

[0016] 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.

[0017] 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°.

[0018] As a preferred technical solution for the roof greening ventilation and irrigation system, the control module responds to the judgment result of the trend analysis module that the humidity decrease trend is too large, outputs an irrigation command for the corresponding planting area, controls the irrigation module to irrigate in an intermittent quantitative manner, and re-acquires the humidity data of the planting area after each irrigation and updates the monitoring curve. When the difference between the updated monitoring curve and the standard curve returns to the tolerance range, the irrigation is automatically stopped.

[0019] As a preferred technical solution for roof greening ventilation and irrigation systems, the monitoring module is also configured to collect the temperatures of the planting layer, the overhead layer, and the outdoor environment, respectively.

[0020] As a preferred technical solution for rooftop greening ventilation and irrigation systems, the control module also includes the following irrigation control process:

[0021] The fan and irrigation module should be kept off during the day;

[0022] 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:

[0023] 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.

[0024] As a preferred technical solution for roof greening ventilation and irrigation systems, 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.

[0025] As a preferred technical solution for roof greening ventilation and irrigation system, the side of the elevated floor opposite to the fan is provided with several ventilation holes to form a ventilation cavity in the elevated floor.

[0026] Compared with the prior art, the beneficial effect of the present invention is that by introducing an intelligent control mechanism based on humidity change trend analysis, dynamic, precise and adaptive adjustment of soil humidity in the roof planting layer is achieved.

[0027] The entire system can automatically determine the dynamic state of water in the plant root zone based on the humidity change pattern 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.

[0028] Furthermore, by linking the trend analysis module and the control module, the system acquires self-learning and self-correction capabilities based on time-series data. Through the angle adjustment mechanism of the air guide vane and fan, the auxiliary influence of airflow on humidity changes is introduced, allowing irrigation regulation to go beyond water replenishment and also consider the balance of humidity distribution. By matching the standard curve library with real-time monitoring data, differentiated control logic is achieved for different plant types and different climatic periods, thereby improving the system's applicability and universality. The introduction of temperature monitoring and nighttime operation strategies coordinates ventilation and irrigation behavior with the diurnal heat exchange pattern, balancing energy efficiency and plant root zone comfort.

[0029] In particular, this invention no longer uses a single-point humidity threshold as the control basis, but instead transforms the humidity change process after irrigation or rainfall into a continuous curve and compares it with a standard curve. By analyzing the average and maximum deviations between the monitoring curve and the standard curve, it is possible to determine whether the moisture changes in the plant root zone deviate from the normal trend. This method can more realistically reflect the absorption and evaporation process of water in the soil, avoiding misjudgments caused by instantaneous humidity fluctuations, thereby achieving more stable and gradual humidity control.

[0030] In particular, this invention incorporates adjustable-angle air guides in the elevated layer. When the trend analysis indicates a slight decrease in humidity, the angle of the air guides and the fan speed are adjusted via a control module. The principle behind this is that by altering the direction and speed of airflow, the air exchange between the elevated layer and the planting layer is strengthened or weakened, thereby indirectly affecting the soil evaporation rate. When the humidity decreases less, the angle of the air guides increases and the fan speed rises, accelerating the airflow to remove some moisture. Conversely, when the humidity decreases more significantly, the airflow is paused or slowed down to prevent excessive evaporation.

[0031] In particular, the trend analysis module of this invention has multiple pre-set standard curves, each corresponding to different plant species, different irrigation times, and initial humidity conditions. By matching the current rainfall or irrigation end time with the real-time humidity value, the system automatically selects the closest standard curve for comparison, ensuring the relevance of the judgment criteria.

[0032] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0033] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0034] Figure 1 This is a structural block diagram of the roof greening ventilation and irrigation system according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the roof greening ventilation and irrigation system according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the air guide plate arrangement according to an embodiment of the present invention;

[0037] In the diagram: 1. Planting module; 2. Soil; 3. Elevated layer; 4. Fan; 5. Soil surface irrigation network; 6. Micro water pump; 7. Rainwater collection tank; 8. Solar photovoltaic panel; 9. Battery; 10. Host computer; 11. Outdoor air temperature sensor; 12. Soil temperature sensor; 13. Top surface temperature sensor of roof structure; 14. Soil moisture sensor; 15. Roof structure layer; 16. Wind guide plate. Detailed Implementation

[0038] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] For a better understanding of this invention, please refer to [link / reference]. Figure 2 As shown, this embodiment first provides an ecological heat-insulating roof based on the integration of solar energy storage and greening, including a planting module 1, which is a container with an open top; soil 2, which is laid inside the planting module 1 as a planting layer for plant growth; an elevated layer 3, which is formed between the bottom of the planting layer and the top surface of the roof structure layer 15, forming a ventilation cavity; and a fan 4, which is installed on one side of the elevated layer 3, for forcibly replacing the air in the elevated layer 3.

[0042] The irrigation module in this embodiment includes: a rainwater collection tank 7, used to collect and store rainwater;

[0043] The surface irrigation network 5 is laid on top of the soil 2;

[0044] The micro water pump 6 has its inlet end connected to the rainwater storage tank 7 and its outlet end connected to the soil surface irrigation network 5, and is used to provide irrigation power.

[0045] And, solar photovoltaic panels 8, used to convert solar energy into electrical energy;

[0046] Battery 9, connected to solar photovoltaic panel 8, stores electrical energy and powers the host computer 10 and execution components at night. The control module and trend analysis module are both integrated into the host computer 10.

[0047] The monitoring module in this embodiment includes an outdoor air temperature sensor 11, used to monitor the outdoor ambient temperature;

[0048] Soil temperature sensor 12 is installed in the planting layer to monitor soil temperature;

[0049] The roof structure layer temperature sensor 13 is installed on the top layer of the roof structure layer 15 to monitor the temperature of the open layer near the roof.

[0050] Soil moisture sensor 14, installed in the planting layer and electrically connected to the host computer, is used to monitor real-time soil moisture. Multiple soil moisture sensors are configured for different planting areas. Figure 2 Only one is shown for illustration.

[0051] Based on the above roof structure, please combine Figure 2 See Figure 1 and Figure 3As shown, this embodiment provides a roof greening ventilation and irrigation system, which includes several adjustable-angle wind guides 16 configured in the elevated layer, each wind guide 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.

[0052] The monitoring module collects soil moisture data from 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 is within the allowable range; the control module responds when the curve difference for any planting area exceeds the allowable range by outputting an irrigation command for the corresponding planting area, or an air guide angle adjustment and fan start command, until the curve difference is within the allowable range; the irrigation module receives the irrigation command from the control module and irrigates the corresponding planting area; the standard curve is plotted with time on the x-axis and soil moisture on the y-axis, and the standard curve is configured according to the time of end of rainfall or irrigation and the different types of plants in the planting area.

[0053] In the above embodiments, the system is designed to identify the changing trend of soil moisture, rather than a single instantaneous value, and thus determine the direction and rate of moisture change in the plant root zone, making irrigation and ventilation control more consistent with the actual physiological water requirements of plants. It should be understood that there are multiple planting areas, defined based on the different types of plants being planted, and the elevated layer and the planting layer should be ventilated, not completely isolated.

[0054] In detail, the fan delivers air horizontally in the elevated layer. The air guide plate is normally parallel to the horizontal direction. Upon receiving an angle adjustment command, the air guide plate tilts clockwise relative to its normal position to direct the fan's airflow to the corresponding planting area, thereby adjusting the soil moisture trend in that area. By controlling the tilt angle of different air guide plates, the airflow path within the elevated layer can be dynamically switched. Based on real-time temperature and humidity sensor signals from each planting area, the airflow rate and direction in the corresponding area can be directionally adjusted to achieve precise control over the soil moisture trend in different planting areas. In this embodiment, the angle adjustment of the air guide plate is driven by an electric push rod or a stepper motor, and its control unit is electrically connected to the control module.

[0055] Specifically, 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.

[0056] For example, the steps for creating a standard curve library include:

[0057] In multiple experiments or historical monitoring, data sequences of soil moisture changes over time after natural rainfall or artificial irrigation were recorded for different types of plants (such as herbaceous plants, shrubs, shallow-rooted plants, and deep-rooted plants).

[0058] Set the end time of each rainfall or irrigation as the starting point t0 of the horizontal axis, and set the soil moisture value at the corresponding time as the starting point H0 of the vertical axis.

[0059] Using this as a benchmark, the rate of change of humidity over subsequent time periods (obtained by continuous monitoring by soil moisture sensors) is normalized to form a humidity decay curve or a humidity recovery curve.

[0060] Multiple sets of experimental curves were smoothed and their features extracted to obtain standard curves representing typical humidity variation characteristics of the plant species. In practice, a subset of curves containing various environmental conditions (different light intensities, temperatures, and substrate types) can be established for the standard curve library, allowing for dynamic matching based on real-time environmental parameters during system operation.

[0061] When the system is running, the trend analysis module obtains the time t1 of the day when precipitation or irrigation ends in each planting area and the corresponding soil moisture H1, and uses the two as search parameters to call the corresponding standard curve from the standard curve library.

[0062] Specifically, the trend analysis module is configured to perform the following steps to determine whether the curve difference exceeds the tolerance range:

[0063] 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.

[0064] Calculate the difference sequence for each corresponding sampling point of the monitoring curve and the standard curve;

[0065] Calculate the average deviation and maximum deviation of the difference sequence and compare them with the corresponding thresholds. Based on the comparison results, determine whether it exceeds or is within the tolerance range. If it exceeds the tolerance range, further determine whether the humidity reduction trend is too large or too small.

[0066] In detail, within a preset time interval after rainfall or irrigation, the trend analysis module synchronously samples the monitoring curve and the standard curve at a fixed time resolution to obtain a set of soil moisture data points for the corresponding time series. The monitoring curve is M(t), the standard curve is S(t), and the time sampling interval is Δt. Then, at each time point ti (i∈[1,N]), the soil moisture values ​​extracted from the monitoring curve and the standard curve are M(ti) and S(ti), respectively.

[0067] For each corresponding sampling point ti of the monitoring curve and the standard curve, calculate the sequence of differences between them:

[0068] ΔH(ti)=∣M(ti)−S(ti)∣,

[0069] Where ΔH(ti) represents the difference in soil moisture at time point ti.

[0070] After obtaining the difference sequence, the trend analysis module calculates the following two deviation indicators:

[0071] Average deviation: the average value of each ΔH(ti); maximum deviation: the maximum value among each ΔH(ti);

[0072] Each value is compared to its corresponding threshold to determine if it falls within the acceptable tolerance range. The threshold settings should be tailored to the specific scenario, taking into account at least the plant type and soil type. For example, in this embodiment, the scenario is sandy soil with herbaceous plants; the average deviation threshold is set to 0.06, and the maximum deviation threshold is set to 0.1. Of course, the thresholds should be set such that abnormal growth occurs when the deviation exceeds the threshold; these settings can be calibrated using empirical data.

[0073] Specifically, 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:

[0074] When the average deviation of the difference sequence is less than or equal to the preset threshold, the air guide plate angle adjustment command is output, so that the corresponding air guide plate is deflected clockwise relative to the normal horizontal position to the first angle range (25°-45°);

[0075] 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 (45°-80°) and the fan speed is increased accordingly.

[0076] The second angle range is larger than the first angle range, and the deflection angle of the air guide plate does not exceed 90°. In this implementation, the preset threshold is 0.1, which is used to quantify and differentiate different humidity adjustment measures. This can be set according to the specific scenario, and should, of course, be greater than the corresponding average deviation threshold. Through the above control process, the system can intelligently adjust environmental conditions to adapt to different soil moisture states, thereby achieving precise water management and ensuring the healthy growth of plants.

[0077] Specifically, in response to the trend analysis module's judgment that the humidity is decreasing significantly, the control module outputs an irrigation command for the corresponding planting area, controls the irrigation module to irrigate in an intermittent and quantitative manner, re-acquires 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.

[0078] Specifically, the monitoring module is also configured to collect the temperatures of the planting layer, the raised floor, and the outdoor environment, respectively. Based on the above embodiments, to further ensure irrigation effectiveness, for high-temperature summer scenarios, considering that currently solar photovoltaic panels are used to drive fans to ventilate the raised floor during the day, and water pumps are used to irrigate the soil with water collected in rainwater collection troughs, this daytime ventilation logic is counterproductive: in summer, the outdoor temperature is much higher than the soil temperature during the day. Ventilation at this time not only fails to cool the soil but also raises the soil temperature, increasing the roof's cooling load. Furthermore, it ignores the problem of reverse heat transfer at night due to the soil's high thermal inertia, i.e., heat stored during the day is transferred back into the room at night. Therefore, for the above scenarios, the control module also includes the following irrigation control process:

[0079] Keep the fans and irrigation modules off during the day;

[0080] The nighttime control module reads the temperatures of the planting layer, the raised platform, and the outdoor environment; when it determines that the temperature of the planting layer is higher than the temperature of the raised platform:

[0081] The irrigation module irrigates the planting layer. Simultaneously, it compares the planting layer temperature with the outdoor ambient temperature. The fan is activated to cool the planting layer only if the outdoor ambient temperature is lower than the planting layer temperature. When the control module determines that the planting layer temperature is lower than or equal to the outdoor ambient temperature, it stops operating the fan and irrigation module. This effectively prevents heat stored in the roof from transferring into the room at night, significantly reducing nighttime air conditioning energy consumption.

[0082] It should be understood that the above irrigation control process is not used for irrigation of a single planting area based on trend analysis. Irrigation is carried out in an intermittent, quantitative manner only after the irrigation of the entire planting layer has ended or after rainfall has ended.

[0083] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention; various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

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 irrigation instructions for the corresponding planting area, or instructions for adjusting the wind deflector angle and starting the fan, 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 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. 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.

2. The roof greening ventilation and irrigation system according to claim 1, 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.

3. The roof greening ventilation and irrigation system according to claim 2, 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°.

4. The roof greening ventilation and irrigation system according to claim 2, 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.

5. 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.

6. The roof greening ventilation and irrigation system according to claim 5, 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.

7. The roof greening ventilation and irrigation system according to claim 6, 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.

8. 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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