Search

CN-121993885-A - Control method and system capable of automatically adjusting room fresh air quantity

CN121993885ACN 121993885 ACN121993885 ACN 121993885ACN-121993885-A

Abstract

The invention relates to the technical field of air quantity control and discloses a method and a system for controlling fresh air quantity of an automatically-adjustable room, wherein the method comprises the steps of acquiring and storing room condition time historical data of the room, extracting a room condition change condition set based on environmental parameters and change quantity thereof, and establishing a conditional room rate prediction model; and in each control period, collecting the number of indoor personnel and environmental parameters, combining the personnel change types, utilizing a prediction model to obtain the current conditional indoor rate, calculating the basic fresh air quantity and the corrected fresh air quantity according to the current conditional indoor rate, synthesizing to obtain the target fresh air quantity, generating an execution instruction, and storing and updating the period data. According to the invention, through data-driven historical behavior pattern learning and real-time multi-parameter fusion prediction, the balance of timeliness and stability of fresh air quantity setting is realized, and the problems of slow control response or frequent fluctuation caused by discrete change of personnel and environmental feedback lag are alleviated.

Inventors

  • LIN XIUJUN

Assignees

  • 艾奕康设计与咨询(深圳)有限公司

Dates

Publication Date
20260508
Application Date
20260225

Claims (10)

  1. 1. The method for controlling the fresh air quantity of the room capable of being automatically adjusted is characterized by comprising the following steps of: acquiring and storing room condition time historical data of a room, and extracting a room condition change condition set based on environmental parameters and environmental parameter change amounts in the room condition time historical data; counting the total number of samples meeting the room condition change conditions according to each room condition change condition in the room condition change condition set, counting the number of samples in a manned state, and calculating the conditioned room rate according to the number of samples in the manned state and the total number of samples; Collecting the number of indoor personnel and environmental parameters of a room in each control period, and calculating the environmental parameter variation of the environmental parameters relative to the environmental parameter variation of the previous control period; calculating the difference between the indoor personnel number in the current control period and the indoor personnel number in the previous control period to obtain personnel number difference values, and determining personnel number change categories according to the personnel number difference values; Determining a current room condition change condition based on an environment parameter and an environment parameter change amount of a current control period, and inputting the current room condition change condition into the room rate prediction model to obtain a conditional room rate of a target control period; Determining basic fresh air quantity according to the indoor personnel quantity and the environmental parameter, determining corrected fresh air quantity according to the room rate and the personnel quantity change category of the auxiliary condition, and synthesizing the basic fresh air quantity and the corrected fresh air quantity into target fresh air quantity; And generating an execution parameter set based on the target fresh air quantity, outputting a control instruction to a fan according to the execution parameter set, and storing collected data of a target control period, the current room condition change condition, the conditional room rate, the target fresh air quantity and the execution parameter set into the room condition time history data.
  2. 2. The method according to claim 1, wherein the step of extracting a room condition change condition set based on the environmental parameter and the environmental parameter change amount in the room condition time history data comprises: sorting the historical values of each environmental parameter in the room condition time historical data, and dividing the historical values into at least two value intervals according to the number of samples to obtain value interval boundaries of the corresponding environmental parameters; sorting the environmental parameter variation, dividing the environmental parameter variation into at least two variation intervals according to the number of samples, and obtaining variation interval boundaries of corresponding environmental parameters; For each time sample in the room condition time history data, determining a value interval identifier of the time sample according to a value interval boundary of the corresponding environment parameter, determining a change interval identifier of the time sample according to a change interval boundary of the corresponding environment parameter, and combining the value interval identifiers of the environment parameters and the change interval identifiers to form a room condition change condition; And merging a value interval or a change interval corresponding to at least one environmental parameter in the room condition change conditions with an adjacent interval when the occurrence number of any room condition change condition is smaller than a first number, and reforming the room condition change conditions, and repeatedly counting and merging to obtain a room condition change condition set.
  3. 3. The method as set forth in claim 2, wherein the step of collecting the number of indoor people and the environmental parameter of the room in each control period and calculating the change of the environmental parameter with respect to the environmental parameter of the previous control period comprises: Sequencing the multiple sampling values, removing a plurality of sampling values at the minimum end and a plurality of sampling values at the maximum end after sequencing, and determining the average value of the residual sampling values as the environmental parameter period value of the control period; when the personnel quantity change type is in-room change or out-of-room change, the first sampling interval is adjusted to be a second sampling interval, the plurality of sampling values are acquired again in the control period, and the environmental parameter period value is determined again; and the environmental parameter period value of the current control period is differenced with the environmental parameter period value of the previous control period to obtain the environmental parameter variation, the control period duration is a fixed duration, and the adjustment of the first sampling interval and the second sampling interval does not change the control period duration.
  4. 4. The method for automatically adjusting the fresh air volume of a room according to claim 3, wherein when the room rate is set up in the room rate prediction model according to the room condition change condition and the precondition, the method comprises the steps of: establishing a room condition change condition index table, wherein each record of the room condition change condition index table comprises a room condition change condition, and comprises the total number of samples corresponding to the room condition change condition, the number of samples with persons corresponding to the room condition change condition, and the conditional room rate is calculated by the number of samples with persons and the total number of samples; In each control period, matching the current room condition change condition with a room condition change condition index table, and reading the conditional room rate corresponding to the matching record when the matching is successful; When the matching is unsuccessful, reconstructing the current room condition change condition according to a preset priority order, wherein the preset priority order comprises deleting the environment parameter change interval mark firstly and then deleting the environment parameter value interval mark, and merging adjacent environment parameter value intervals or merging adjacent environment parameter change intervals after the deletion is completed; And when the maximum reconstruction times are not successfully matched, reading the conditional on-room rate corresponding to the record with the highest occurrence times in the room condition change condition index table.
  5. 5. The method of claim 4, wherein determining the basic fresh air volume according to the number of people in the room and the environmental parameter comprises: The method comprises the steps of obtaining room basic parameters from a user input parameter table or a building information parameter table, wherein the room basic parameters comprise room area, room volume and room usage; the method comprises the steps of determining a new air volume increment value corresponding to the environmental parameter according to a falling area of the deviation in a multi-section mapping table, wherein the multi-section mapping table is a monotonic non-decreasing mapping relation between the new air volume increment value and the deviation value; Synthesizing the fresh air quantity increment value corresponding to the environmental parameter to obtain an environmental fresh air quantity demand value; synthesizing the number of people fresh air volume demand value and the environment fresh air volume demand value to obtain basic fresh air volume; And carrying out boundary constraint on the basic fresh air quantity, wherein the boundary constraint comprises more than or equal to the minimum fresh air quantity and less than or equal to the maximum fresh air quantity, and carrying out change rate constraint on the basic fresh air quantity, and the change rate constraint comprises that the change quantity of the basic fresh air quantity of adjacent control periods is not more than a limit value.
  6. 6. The method of claim 5, wherein when determining the corrected fresh air volume based on the room rate and the category of the change in the number of people according to the condition, the method comprises: Reading personnel quantity change types, and reading a correction mode parameter set, wherein the correction mode parameter set comprises an in-room correction coefficient, an out-of-room correction coefficient and an unchanged correction coefficient; determining a probability weight value according to the conditional on-cell rate, and multiplying the probability weight value by the correction coefficient to obtain corrected fresh air quantity; And carrying out limiting constraint on the corrected fresh air quantity, wherein the limiting constraint comprises the fact that the corrected fresh air quantity does not exceed the preset proportion of the basic fresh air quantity, and determining the corrected fresh air quantity.
  7. 7. The method of claim 6, wherein synthesizing the basic fresh air volume and the corrected fresh air volume into the target fresh air volume comprises: calculating a composite value of the basic fresh air quantity and the corrected fresh air quantity; Comparing the synthesized value with the maximum fresh air volume, and taking a value smaller than or equal to the maximum fresh air volume; When the personnel quantity change category is the change of entering the room, the first ascending amplitude limiting rule is adopted to limit the target fresh air quantity, and when the personnel quantity change category is the change of leaving the room, the first descending amplitude limiting rule is adopted to limit the target fresh air quantity; The first ascending amplitude limiting rule, the first descending amplitude limiting rule and the second amplitude limiting rule respectively limit the maximum ascending amount, the maximum descending amount and the maximum change amount of the target fresh air quantity of the adjacent control period, and the target fresh air quantity is determined.
  8. 8. The automatically adjustable room fresh air volume control method according to claim 7, wherein generating the execution parameter set based on the target fresh air volume comprises: Acquiring a fan operation characteristic table, wherein the fan operation characteristic table records the corresponding relation between fresh air quantity and fan rotating speed, and records the corresponding relation between the opening of a fresh air valve and the fresh air quantity; searching a matching interval in a fan operation characteristic table according to the target fresh air quantity to obtain a fan rotating speed set value and a fresh air valve opening set value; at least one item of the fan rotating speed set value and the fresh air valve opening set value is selected as an execution parameter set, and the execution parameter set is subjected to constraint processing, wherein the constraint processing comprises rotating speed limiting, valve opening limiting and adjacent control period change rate limiting; And outputting the execution parameter set to a fan or a fresh air valve to form a control instruction.
  9. 9. The method of claim 8, wherein storing the collection data of the target control period, the current room condition change condition, the conditioned room rate, the target fresh air volume, and the execution parameter set into the room condition time history data comprises: time alignment is carried out on the collected data of the target control period, wherein the time alignment comprises the step of uniformly mapping the number of indoor personnel, environmental parameters and environmental parameter variation to the same control period time stamp; Storing the current room condition change condition, the conditioned room rate, the target fresh air quantity and the execution parameter set in association with the control period time stamp to form a control period record; The method comprises the steps of carrying out integrity check on a control period record, wherein the integrity check comprises field missing check and numerical range check, writing historical data of room condition time when the integrity check passes, deleting the control period record and replacing the control period record by adopting the previous control period record when the integrity check fails; Capacity management is performed on the in-room condition time history data, and capacity management includes deleting the earliest record according to a time window or performing downsampling processing on the history record according to sampling intervals.
  10. 10. An automatically adjustable room fresh air volume control system for implementing the automatically adjustable room fresh air volume control method according to any one of claims 1-9, comprising: the system comprises a historical data acquisition module, a room condition change condition set and a room condition change condition set, wherein the historical data acquisition module is configured to acquire and store room condition time historical data of a room; The room rate statistical modeling module is configured to count the total number of samples meeting the room condition change conditions according to each room condition change condition in the room condition change condition set, count the number of samples in a manned state, and calculate the conditional room rate according to the number of samples in the manned state and the total number of samples; the control period acquisition module is configured to acquire the number of indoor personnel and environmental parameters of a room in each control period and calculate the environmental parameter variation of the environmental parameters relative to the environmental parameter variation of the previous control period; The person number change judging module is configured to calculate the difference between the number of indoor persons in the current control period and the number of indoor persons in the previous control period to obtain a person number difference value, and determine a person number change category according to the person number difference value; The room rate inference output module is configured to determine a current room condition change condition based on an environmental parameter and an environmental parameter change amount of a current control period, and input the current room condition change condition into the room rate prediction model to obtain a conditional room rate of a target control period; The target air volume generating module is configured to determine basic fresh air volume according to the indoor personnel number and the environmental parameter, determine corrected fresh air volume according to the conditional on-room rate and the personnel number change category, and synthesize the basic fresh air volume and the corrected fresh air volume into target fresh air volume; The execution parameter storage module is configured to generate an execution parameter set based on the target fresh air quantity, output a control instruction to a fan according to the execution parameter set, and store the collected data of a target control period, the current room condition change condition, the conditional room rate, the target fresh air quantity and the execution parameter set to the room condition time history data.

Description

Control method and system capable of automatically adjusting room fresh air quantity Technical Field The invention relates to the technical field of air volume control, in particular to a method and a system for controlling fresh air volume of a room capable of being automatically adjusted. Background The fresh air system realizes dilution of carbon dioxide, fine particles, volatile organic compounds, peculiar smell and the like by introducing outdoor air into the room and discharging part of indoor air, and is matched with temperature and humidity regulation to a certain extent, so that the fresh air system is widely applied to houses and small indoor spaces. The setting of the fresh air volume generally requires a balance between air quality, comfort and energy consumption, so the rationality of the control strategy directly affects the use experience and running costs. The existing room fresh air quantity control mode mainly comprises fixed air quantity operation, gear operation, timing operation and regulation operation based on sensor feedback. In the mode based on sensor feedback, the common practice is to use the concentration of carbon dioxide or fine particles as the main control quantity, to adjust the rotation speed of the fan and the opening of the valve by adopting threshold control or proportional control, and to use human body presence detection, people number estimation, door and window opening and closing states and the like as auxiliary information for linkage control. The method is relatively simple in engineering realization, but often faces multi-source uncertain factors in a home scene, namely, on one hand, environmental parameters have measurement noise, drift and sampling delay, indexes such as carbon dioxide and the like have obvious hysteresis characteristics, on the other hand, activities such as opening and closing doors and windows, cooking, smoking, cleaning and the like can introduce short-time strong disturbance to enable the environmental parameters to present non-stable fluctuation, and meanwhile, the residence space is small, the change amplitude of the number of people is limited, and related signals of the number of people are discrete jump rather than continuously change in time. Disclosure of Invention In view of the above, the invention provides a method and a system for controlling the fresh air quantity of an automatically-adjustable room, which aim to solve the problems that the existing fresh air control mode is difficult to realize timeliness and stability of fresh air quantity setting under limited observation conditions and the fresh air quantity adjustment lag or frequent fluctuation is easy to occur under the conditions that personnel in and out are in discrete events in small space scenes such as families, environmental parameter feedback is lagged and is easily influenced by transient disturbance such as door and window opening and living activities. In one aspect, the invention provides a method for controlling the fresh air quantity of a room, which comprises the following steps: acquiring and storing room condition time historical data of a room, and extracting a room condition change condition set based on environmental parameters and environmental parameter change amounts in the room condition time historical data; counting the total number of samples meeting the room condition change conditions according to each room condition change condition in the room condition change condition set, counting the number of samples in a manned state, and calculating the conditioned room rate according to the number of samples in the manned state and the total number of samples; Collecting the number of indoor personnel and environmental parameters of a room in each control period, and calculating the environmental parameter variation of the environmental parameters relative to the environmental parameter variation of the previous control period; calculating the difference between the indoor personnel number in the current control period and the indoor personnel number in the previous control period to obtain personnel number difference values, and determining personnel number change categories according to the personnel number difference values; Determining a current room condition change condition based on an environment parameter and an environment parameter change amount of a current control period, and inputting the current room condition change condition into the room rate prediction model to obtain a conditional room rate of a target control period; Determining basic fresh air quantity according to the indoor personnel quantity and the environmental parameter, determining corrected fresh air quantity according to the room rate and the personnel quantity change category of the auxiliary condition, and synthesizing the basic fresh air quantity and the corrected fresh air quantity into target fresh air quantity; And generating an execution parameter set based on