CN-121128505-B - Temperature control method and device for seedling greenhouse cultivation environment and storage medium

CN121128505BCN 121128505 BCN121128505 BCN 121128505BCN-121128505-B

Abstract

The invention relates to the technical field of temperature control, in particular to a temperature control method, a device and a storage medium for a seedling greenhouse cultivation environment. The method comprises the steps of establishing a temperature influence model in the greenhouse, predicting the temperature of air in the greenhouse according to the temperature of soil in the greenhouse, optimizing the influence of the temperature of air outside the greenhouse on the temperature of air in the greenhouse, acquiring a seedling target soil temperature range and a target air temperature range in the current seedling growth stage, starting an air temperature regulation strategy when the fact that the temperature of air in the greenhouse is not in the target air temperature range is monitored in real time, judging whether the temperature of the soil in the greenhouse is in the range of the temperature of the soil in the target greenhouse, and regulating the temperature of the soil if the temperature of the soil in the greenhouse is not in the range of the temperature of the soil in the target soil. The method greatly improves the response speed and adaptability to environmental changes, and provides more stable and proper growth conditions for the seedlings.

Inventors

LV TINGLIANG
LIU YING
LUO YUNXIA
LIU JIE

Assignees

山东广为智能科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250910

Claims (9)

1. The temperature control method of the seedling greenhouse cultivation environment is characterized by comprising the following steps of: S1, respectively burying distributed sensors at different depths of soil, collecting soil temperature in a greenhouse in real time, and simultaneously deploying the distributed sensors at the height of a plant canopy to measure air temperature in the greenhouse; S2, establishing a greenhouse temperature influence model according to the greenhouse soil temperature and the greenhouse air temperature acquired in real time and the historical greenhouse soil temperature and the greenhouse air temperature, wherein the greenhouse air temperature can be predicted according to the greenhouse soil temperature by the greenhouse temperature influence model, and the influence of the greenhouse air temperature on the greenhouse air temperature is considered for optimization when the greenhouse air temperature influence model is established, and the specific steps of establishing the greenhouse air temperature influence model are as follows: s21, establishing soil temperature With the temperature of the air in the greenhouse Dynamic relationship between them and consider soil humidity Is a nonlinear regulation of (a); S22, calculating a cross-correlation function through historical data so as to determine the lag time And at the soil temperature With the temperature of the air in the greenhouse Introducing a hysteresis term in the dynamic relationship between the two; S23, finally, the temperature outside the shed Adding soil temperature as a linear term With the temperature of the air in the greenhouse In the dynamic relation between the two, the noise items of illumination fluctuation and artificial interference are considered at the same time Finally, generating a temperature influence model in the greenhouse; S3, determining a seedling target soil temperature range and a target air temperature range based on a growth stage of the seedling, judging whether the seedling target soil temperature range and the target air temperature range are within the target air temperature range by monitoring the real-time air temperature in the greenhouse so as to determine an air temperature error between the air temperature in the greenhouse and the target air temperature in the greenhouse, and predicting air temperature adjustment completion time based on an air temperature adjustment strategy and an in-greenhouse temperature influence model ; S4, in the temperature regulation process, monitoring the soil temperature in the greenhouse in real time, and predicting the time according to the temperature influence model in the greenhouse And if the temperature of the soil in the greenhouse is not within the range of the soil temperature in the target greenhouse, adjusting the soil temperature.
2. The method for controlling the temperature of the cultivation environment of the nursery-grown plant greenhouse according to claim 1, wherein the step S2 of optimizing the influence of the temperature of the air outside the greenhouse on the temperature of the air inside the greenhouse is performed by considering the influence of the temperature of the air outside the greenhouse when the temperature influence model inside the greenhouse is established, comprises the specific steps of S24 of quantifying the nonlinear influence of the ventilation intensity on the heat exchange inside and outside the greenhouse by adopting an exponential function to generate a heat leakage coefficient, S25 of capturing the temperature hysteresis effect caused by heat accumulation or heat release of the greenhouse by weighting the temperature difference inside and outside the greenhouse in the past time period and passing through an attenuation factor S26, controlling the attenuation rate of the historical influence based on the current outside temperature of the shed Is combined with the cumulative effect of the direct effect and the historical temperature hysteresis effect to generate the temperature influence coefficient outside the greenhouse And further generating an optimized temperature influence model in the greenhouse.
3. The method for controlling the temperature of the cultivation environment of the seedling greenhouse according to claim 2, wherein the step S3 is characterized in that the target soil temperature range and the target air temperature range of the seedling are determined based on the growth stages of the seedling, specifically, the growth state data of the seedling are collected in real time through a sensor installed in the greenhouse, the growth stage of the current seedling is judged based on the collected growth state data of the seedling, the target soil temperature and the target air temperature range corresponding to each growth stage of the seedling are determined, the target soil temperature and the target air temperature range are adjusted according to the current environment, and finally the target soil temperature range and the target air temperature range are determined.
4. The method for controlling the temperature of a cultivation environment in a nursery-grown plant greenhouse according to claim 3, wherein the specific steps of the air temperature regulation strategy in S3 are that S31 compares the real-time data of the temperature of the air in the greenhouse at the current time point with the air temperature range in the target greenhouse, and calculates an air temperature error S32, air temperature error is generated based on the nonlinear mapping function Mapping to primary control force, and simultaneously utilizing PID controller to output nonlinear mapping function and combining proportional, integral and differential control action to finally generate regulation signal containing heating power and heating time 。
5. The method for controlling temperature in a nursery-grown plant greenhouse cultivation environment as set forth in claim 4, wherein in S3, the air temperature adjustment completion time is predicted based on an air temperature adjustment strategy and an intra-greenhouse temperature influence model S33, the control variable including heating power is to be included Inputting the temperature influence model into the greenhouse, predicting the greenhouse air temperature of the next time step, S34, judging whether the greenhouse air temperature of the next time step is within the range of the target greenhouse air temperature, if not, iteratively updating the air temperature error and the regulation signal until the predicted greenhouse air temperature enters the target range, S35, adopting the golden section search method to quickly solve the minimum regulation time And adjusts the prediction time based on the compensation factor for the historical prediction error.
6. The method for controlling temperature of a nursery-grown plant greenhouse cultivation environment according to claim 5, wherein in S4, the time is predicted according to a greenhouse temperature influence model S41, obtaining a heat transfer coupling coefficient according to on-line fitting And heat loss rate Thereby obtaining the soil temperature response time constant And steady state temperature S42, considering the inherent time lag of the system based on the data of S41 And predicting soil temperature dynamic response and prediction time in the greenhouse by adopting a first-order inertial system model The soil temperature in the greenhouse.
7. A temperature control device of an intelligent seedling greenhouse cultivation environment comprises a sensor, a storage, a processor and a computer program which is stored in the storage and can run on the processor, and is characterized in that the processor executes the computer program to realize the steps of the temperature control method of the seedling greenhouse cultivation environment according to any one of claims 1 to 6.
8. The device for controlling the temperature of the cultivation environment of the nursery-grown plant greenhouse of claim 7, wherein the sensor at least comprises a soil temperature sensor, an air temperature sensor, a soil humidity sensor, a high-definition camera and an outside air temperature sensor.
9. A storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor realizes the steps of the method according to any of claims 1 to 6.

Description

Temperature control method and device for seedling greenhouse cultivation environment and storage medium Technical Field The invention relates to the technical field of temperature control, in particular to a temperature control method, a device and a storage medium for a seedling greenhouse cultivation environment. Background In modern gardening and agricultural planting, temperature control of the nursery greenhouse cultivation environment is one of the key factors to ensure healthy growth of crops. The growth of the nursery stock not only depends on proper air temperature, but also has strict requirements on the soil temperature where the root system is located. The temperature requirements for different growth stages are different, for example, higher soil temperatures are required to promote germination during seed germination, while more stable temperature conditions are required to support healthy root development and photosynthesis during seedling stage. However, in practice, maintaining such an ideal temperature profile is extremely challenging. Because of the difference of heat conduction efficiency between soil and air and the change of external climate conditions, a single whole temperature control strategy is difficult to meet the specific requirements of each part of the nursery stock. The limitations of conventional temperature control systems are more pronounced especially in large greenhouses or in severe weather conditions for many consecutive days. These systems generally lack fine regulation and control capability for deep soil temperature and micro-climate of canopy, which results in problems such as energy waste caused by excessively high canopy temperature while the soil temperature reaches an ideal state in the heating process, or influence on healthy development of root system caused by excessively fast soil temperature drop during aeration and cooling. Therefore, a temperature control method, a temperature control device and a storage medium for a seedling greenhouse cultivation environment are provided. Disclosure of Invention The invention aims to provide a temperature control method, a device and a storage medium for a seedling greenhouse cultivation environment, and aims to solve the problems that the temperature of the whole greenhouse is always uniformly regulated by a traditional temperature control system provided in the background art, so that a canopy is overheated when soil is heated, energy consumption is wasted, the soil temperature suddenly drops when ventilation and cooling are performed, and root growth is affected. In order to achieve the above purpose, the invention aims to provide a temperature control method of a nursery stock greenhouse cultivation environment, which comprises the following steps: S1, respectively burying distributed sensors at different depths of soil, collecting soil temperature in a greenhouse in real time, and simultaneously deploying the distributed sensors at the height of a plant canopy to measure air temperature in the greenhouse; s2, establishing a greenhouse temperature influence model according to the greenhouse soil temperature and the greenhouse air temperature acquired in real time and the historical greenhouse soil temperature and greenhouse air temperature, wherein the greenhouse air temperature can be predicted according to the greenhouse soil temperature by the greenhouse temperature influence model, and the influence of the greenhouse air temperature on the greenhouse air temperature is considered to be optimized when the greenhouse air temperature influence model is established; S3, determining a seedling target soil temperature range and a target air temperature range based on a growth stage of the seedling, judging whether the seedling target soil temperature range and the target air temperature range are within the target air temperature range by monitoring the real-time air temperature in the greenhouse so as to determine an air temperature error between the air temperature in the greenhouse and the target air temperature in the greenhouse, and predicting air temperature adjustment completion time based on an air temperature adjustment strategy and an in-greenhouse temperature influence model ; S4, in the temperature regulation process, monitoring the soil temperature in the greenhouse in real time, and predicting the time according to the temperature influence model in the greenhouseAnd if the temperature of the soil in the greenhouse is not within the range of the soil temperature in the target greenhouse, adjusting the soil temperature. As a further improvement of the technical scheme, the specific steps for establishing the temperature influence model in the shed in the S2 are as follows: s21, establishing soil temperature With the temperature of the air in the greenhouseDynamic relationship between them and consider soil humidityIs a nonlinear regulation of (a); S22, calculating a cross-correlation function through