CN109579246B - Control method and control system for fresh air fan and fresh air fan - Google Patents

Control method and control system for fresh air fan and fresh air fan Download PDF

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CN109579246B
CN109579246B CN201811516659.7A CN201811516659A CN109579246B CN 109579246 B CN109579246 B CN 109579246B CN 201811516659 A CN201811516659 A CN 201811516659A CN 109579246 B CN109579246 B CN 109579246B
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gear
ventilation
air
running
concentration
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CN109579246A (en
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陈文恭
熊建民
刘磊
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Beijing Huandu Top Air Conditioning Co ltd
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Beijing Huandu Top Air Conditioning Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Chemical & Material Sciences (AREA)
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  • Mechanical Engineering (AREA)
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  • Physics & Mathematics (AREA)
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  • Mathematical Physics (AREA)
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Abstract

The invention provides a control method for a fresh air machine, which comprises the following steps: (1) measuring a pollutant concentration value of indoor air; (2) calculating a concentration interval to which the pollutant concentration value belongs, generating an execution gear by using a delay algorithm, and automatically operating; (3) judging whether the running time under the same running gear is longer than the preset maximum running time or not, and if not, continuing running with the currently running gear; if so, the operation is switched to the ventilation gear operation corresponding to the currently operated gear. According to the control method, the operation gear of the fresh air fan is automatically controlled according to the single indoor pollutant concentration value, the operation time of the fresh air fan at the same gear is detected, and the currently operated gear is switched to the ventilation gear to perform override operation in due time, so that the oxygen content of indoor air can be kept at a relatively stable level. The invention also provides a control system and a new fan for realizing the control method.

Description

Control method and control system for fresh air fan and fresh air fan
Technical Field
The invention relates to a control method of a fresh air fan, and also relates to a control system for realizing the control method and the fresh air fan, belonging to the field of ventilation equipment.
Background
With the rapid development of economy and the continuous acceleration of urbanization process, more and more automobile exhaust and industrial waste gas are discharged into the atmosphere, so that the air pollution phenomenon is seriously aggravated, and the haze is serious year by year. In addition, impurities, viruses and harmful gases generated in the room due to various decorations, newly purchased furniture materials and the like also pollute the indoor living of people, so that the hidden health trouble is generated, and the diseases of people are seriously caused.
At present, for the purification of indoor air, an air purifier is selected for treatment in a common family; however, the air purifier can only purify indoor air, and since outdoor air is not introduced, the oxygen content in the indoor air cannot be supplemented in time. If it is desired to replenish the indoor oxygen content while purifying the indoor air, it is best to introduce purified outdoor air from the outdoor side to the indoor side by a fresh air blower.
The new fan is a novel indoor ventilation and exhaust device, belongs to an open circulating system, and enables people to breathe fresh, clean and high-quality air indoors. The existing fresh air machine is generally provided with multiple operation modes and multiple operation gears, and different gears can be selected to operate according to different indoor air quality and outdoor air quality. In the automatic control method of the fresh air machine, in order to ensure the indoor air quality and simultaneously meet the supplement of the indoor oxygen content, a plurality of devices for detecting the indoor air quality, such as a PM2.5 sensor, a temperature and humidity sensor and a CO sensor, are generally required to be arranged on the inner side of the fresh air machine room2The automatic control methods for setting according to the sensors are complex and high in cost. Therefore, the problem to be solved urgently is to provide a low-cost fresh air control method and system while ensuring the indoor air purification effect and keeping the indoor oxygen content.
Disclosure of Invention
The invention aims to provide a control method for a fresh air machine.
Another technical problem to be solved by the present invention is to provide a control system for implementing the above control method.
The invention also provides a new fan comprising the control system.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiments of the present invention, there is provided a control method for a fresh air machine, including the steps of:
(1) measuring a pollutant concentration value of indoor air;
(2) calculating a concentration interval to which the pollutant concentration value belongs, generating an execution gear by using a delay algorithm, and automatically operating;
(3) judging whether the running time of the new fan at the same running gear is longer than the set maximum running time or not, and if not, continuing running at the current running gear; if yes, entering the step (4);
(4) and the air exchange gear is switched to the air exchange gear corresponding to the currently operated gear for operation, the air exchange gear is a gear higher than the currently operated gear, and the air purification capacity of the air exchange gear is greater than that of the currently operated gear.
Preferably, the step (2) further comprises the following sub-steps:
(21) calculating a concentration interval to which the pollutant concentration value belongs, and acquiring a gear corresponding to the concentration interval to which the pollutant concentration value belongs as a new gear;
(22) acquiring a currently running gear, and judging whether a new gear is the same as the currently running gear or not; if the result is no, entering the step (23); if yes, entering step (24);
(23) storing the new gear as an unchanged gear, timing, judging whether the timed length reaches a preset delay time, if so, executing gear shifting operation, controlling the new fan to start running at the new gear, and then returning to the step (1); if the result is negative, the gear shifting operation is not executed, the current running gear is still used for running, and the step (3) is carried out;
(24) judging whether an unchanged gear is stored or not, if not, continuing to operate with the currently operated gear, and then entering the step (3); if yes, stopping timing, deleting unchanged gears, operating in the currently operated gear, and then entering step (3).
Preferably, the pollutant concentration value is divided into a plurality of concentration intervals from low to high according to the air quality state, each concentration interval has a unique gear corresponding to the concentration interval, and the gear corresponding to each concentration interval has air purification capacity matched with the pollution degree of the concentration interval;
in step (21), the measured pollutant concentration value is compared with the critical end point value of each concentration interval, the concentration interval to which the pollutant concentration value belongs is calculated, and then the gear corresponding to the concentration interval is obtained as a new gear.
Preferably, in the gear corresponding to each concentration interval, the air supply voltage is always greater than the air exhaust voltage, so that the indoor air always keeps a micro-positive pressure operation mode.
Preferably, the control device of the fresh air fan is provided with a plurality of gears for respectively increasing the air supply voltage and the air exhaust voltage step by step, and is also provided with an ultra-clean gear with stronger purification capacity, wherein the air supply fan keeps full load operation in the ultra-clean gear, and the air exhaust fan selects the middle-low air exhaust voltage for operation.
Preferably, the step (4) further comprises the following steps: judging whether the concentration value of the pollutants is greater than a threshold value of the concentration of the heavy pollutants, if not, judging that the indoor air does not reach the level of the heavy pollutants, and entering a step (401);
(401) acquiring a ventilation gear corresponding to the currently running gear, and acquiring the maximum ventilation time of the ventilation gear;
(402) judging whether the operation time of the ventilation gear is longer than the maximum ventilation time or not, if so, returning to the step (1); if the result is negative, entering the step (403);
(403) acquiring a new pollutant concentration value, and judging whether the new pollutant concentration value is greater than a concentration threshold value corresponding to a ventilation gear; if yes, returning to the step (2); if the result is negative, entering the step (404);
(404) operation in the ventilation gear is continued and the process returns to step (402).
Preferably, the step (4) further comprises the following steps: judging whether the concentration value of the pollutants is greater than a heavy pollution concentration threshold value, if so, judging that the indoor air is heavily polluted or seriously polluted, and entering a step (411);
(411) according to the times that the same gear reaches the maximum operation time in the same time period, acquiring a ventilation gear corresponding to the currently operated gear and acquiring the maximum ventilation time of the ventilation gear; the more times that the same gear reaches the maximum operation time in the same time period, the stronger the air purification capacity of the acquired ventilation gear is;
(412) judging whether the operation time of the ventilation gear is longer than the maximum ventilation time or not, if so, returning to the step (1); if not, entering step (413);
(413) operation in the ventilation gear is continued and step (412) is returned.
Preferably, in step (3), different maximum operating times are set for different gears;
in the step (4), for different gears, setting a single or a plurality of ventilation gears corresponding to the different gears; the ventilation gears corresponding to different gears can be the same, and each ventilation gear is preset with the maximum ventilation time.
According to a second aspect of the embodiments of the present invention, there is provided a control system for a fresh air machine, configured to implement the above control method, including: the pollutant concentration value measuring device is used for measuring the indoor air pollutant concentration value; and the control device is used for controlling the running gears of the air supply fan and the air exhaust fan according to the control method.
According to a third aspect of the embodiments of the present invention, there is provided a new fan including the control system described above.
According to the control method for the fresh air fan, the operation gear of the fresh air fan is automatically controlled by measuring the single indoor pollutant concentration value, the operation time of the fresh air fan at the same gear is detected, the currently operated gear is timely switched to the ventilation gear with higher purification capacity to perform override operation, and purified air is rapidly supplemented to indoor air, so that the oxygen content of the indoor air can be kept at a relatively stable level, the comfort level of the indoor air is ensured, and the control method is suitable for being used in places such as houses, markets and the like.
Drawings
FIG. 1 is a flow chart illustrating a control method for a fresh air machine according to the present invention;
FIG. 2 shows a flowchart of an algorithm for generating an execution gear using a delay algorithm;
FIG. 3 shows a flow chart of an algorithm for determining air quality status during the override step;
FIG. 4 shows a flow chart of an algorithm suitable for use when the air quality condition has not reached a severe level of contamination in the override operation step;
FIG. 5 shows a flow chart of an algorithm suitable for use when the air quality condition exceeds heavy pollution during the override operation step;
fig. 6 shows a block diagram of a control system for a fresh air machine according to the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The control method provided by the invention can automatically control the fresh air fan only by measuring the indoor air quality, has low cost and simple control logic, and can simultaneously ensure the air purification effect and the indoor oxygen content. Specifically, according to a single index of a pollutant concentration value of indoor air collected in real time, operation gears of an air supply fan and an air exhaust fan in the fresh air fan are controlled. The pollutant concentration value includes but is not limited to any one of the parameters of PM2.5, PM10 and the like representing the air pollution degree. The following description will be made by taking the PM2.5 concentration value as an example.
Fig. 1 shows a control method for a fresh air machine provided by the present invention, which includes the following steps:
step S10, measuring the pollutant concentration value of indoor air;
step S20, calculating a concentration interval to which the pollutant concentration value belongs, generating an execution gear by using a delay algorithm, and then operating;
step S30, judging whether the running time of the new fan in the same running gear is longer than the maximum running time, if not, executing step S50, and continuing running in the current running gear; if yes, go to step S40;
and step S40, switching to the ventilation gear operation corresponding to the current operation gear, wherein the ventilation gear is a gear higher than the current operation gear, and the air purification capacity of the ventilation gear is larger than that of the current operation gear.
Specifically, in step S10, a PM2.5 concentration value in the indoor air may be measured using a PM2.5 measurement device, which may alternatively be a PM2.5 sensor, a PM2.5 detector, or the like. The PM2.5 measuring device may be disposed in one end of the fresh air fan located indoors, and preferably, the PM2.5 measuring device is disposed at the return air inlet, and the PM2.5 measuring device is used for measuring a PM2.5 concentration value in air extracted from indoors. In the automatic control mode of the new fan, the PM2.5 measuring device is controlled to start working first.
In step S20, the process of calculating the concentration section to which the pollutant concentration value belongs and generating the execution range using the delay algorithm is shown in fig. 2.
Step S20 includes the following sub-steps:
s21, calculating a concentration interval to which the pollutant concentration value belongs, and acquiring a gear corresponding to the concentration interval to which the pollutant concentration value belongs as a new gear;
s22, acquiring the current running gear, and judging whether the new gear is the same as the current running gear; if no, go to step S23; if yes, go to step S24;
s23, storing the new gear as the unchanged gear, timing, judging whether the timed length reaches the preset delay time, if so, executing the gear shifting operation, controlling the new fan to start running at the new gear, and then returning to the step S10; if not, the gear shifting operation is not executed, the current running gear is still used for running, and the process goes to step S30;
s24, judging whether there is any gear which has not been changed, if not, continuing to operate with the current gear, and then entering step S30; if so, the timing is stopped, the unchanged gear is deleted, the operation is continued in the currently operated gear, and the process proceeds to step S30.
As can be seen from the foregoing sub-steps, in step S20, the execution shift generated by using the delay algorithm is a new shift only when the pollutant concentration value collected within the delay time is continuously in a new concentration interval; when only a few sporadic pollutant concentration values are in a new concentration interval, the execution gear generated by the delay algorithm is still the gear in operation, namely the gear in original operation does not cause gear shifting, so that the interference of occasional data fluctuation on the stable operation of the new fan is avoided.
The following describes an exemplary data processing procedure of step S20 with reference to a specific example.
In the control device of the fresh air fan, a pollutant concentration value is divided into a plurality of concentration intervals from low to high according to the air quality state, each concentration interval has a unique gear corresponding to the concentration interval, and the gear corresponding to each concentration interval has air purification capacity matched with the pollution degree of the concentration interval. In step S21, the measured pollutant concentration value is compared with the critical end point values of each concentration interval to obtain a concentration interval to which the pollutant concentration value belongs, and then the gear corresponding to the concentration interval is obtained as a new gear.
For example, according to different indoor air quality states, the concentration value of PM2.5 is divided into the following 6 concentration intervals, and the operation gear corresponding to each concentration interval is shown in table 1. The supply and exhaust voltages for each gear are shown in table 2.
PM2.5 number (. mu.g/m)3) Quality of airState of measurement Operating gear
0≤PM2.5≤35 Superior food 1
35＜PM2.5≤75 Good wine 2
75＜PM2.5≤115 Slight pollution 4
115＜PM2.5≤150 Moderate pollution 5
150＜PM2.5≤250 Severe pollution 7
PM2.5＞250 Severe pollution 8
TABLE 1 corresponding relation table of indoor PM2.5 concentration interval and operation gear
Figure BDA0001902140570000071
TABLE 2 air supply and exhaust voltage lists corresponding to the new fan operation gears
As can be seen from Table 1, the critical end point values of 6 concentration intervals are 35μg/m375 μ g/m3, 115 μ g/m3, 150 μ g/m3 and 250 μ g/m3, 6 concentration intervals correspond to the air quality states "excellent", "good", "light pollution", "moderate pollution", "heavy pollution" and "severe pollution", respectively.
As shown in table 2, in the present embodiment, in the control device of the fresh air fan, 8 stages that change from low to high are provided according to the difference in air purification capacity, and the supply voltage and the discharge voltage in the 8 stages are increased step by step. Wherein, at every operation gear, supply voltage is greater than the voltage of airing exhaust all the time, makes the operating mode that the room air kept the pressure-fired all the time to can prevent other routes such as outdoor air through door, window from getting into indoorly, outdoor air can only get into indoorly through new fan, has guaranteed the purifying effect of room air.
In addition, three ultra-clean gears (clean 1, clean 2 and clean 3) with stronger air purification capacity are also arranged in the control device of the fresh air fan. In three ultra-clean gears, the air supply fan keeps full load operation, and the exhaust fan selects middle and low exhaust voltage to operate. Compared with 8 grades of full load operation of the air supply fan and the air exhaust fan, the three ultra-clean grades have stronger air purification capacity. When the air supply fan keeps full load operation, the lower the exhaust voltage of the exhaust fan is, the stronger the air purification capacity of the corresponding gear is.
After the indoor PM2.5 concentration value is obtained, according to the concentration interval to which the indoor PM2.5 concentration value belongs, the control device of the new fan selects a gear corresponding to the concentration interval as a new gear, an execution gear is generated according to a delay algorithm, the air supply fan and the air exhaust fan are controlled to operate according to the execution gear, and the air supply voltage and the air exhaust voltage corresponding to each gear refer to table 2. For example, when PM2.5 is more than or equal to 0 and less than or equal to 35, the air quality state is 'excellent', the fresh air fan operates at 1 gear, the air supply voltage is 2.1V, and the air exhaust voltage is 1.1V. When PM2.5 is more than 36 and less than or equal to 75, the air quality state is 'good', the fresh air fan operates at 2 grades, the air supply voltage is 2.3V, and the air exhaust voltage is 1.3V. The specific operating states of the other gears are shown in table 2, and are not described in detail herein.
In an ideal state, the air supply voltage and the air supply quantity of the air supply fan satisfy a linear relation, and the air supply voltage is larger, and the air supply quantity of the air supply fan is larger; similarly, the air exhaust voltage and the air exhaust quantity of the air exhaust fan satisfy a linear relation, and the larger the air exhaust voltage is, the larger the air exhaust quantity of the air exhaust fan is. Therefore, the magnitudes of the supply voltage and the discharge voltage represent the air purifying capacities of the supply fan and the discharge fan.
It should be noted that, as shown in table 1, in order to simplify the control process of the automatic operation of the fresh air machine, on the premise of ensuring that the fresh air machine has corresponding air purification capacity, for 6 air quality states, only 6 gears are selected from 8 gears in table 2 as the operation gears corresponding to each concentration interval, and 3 gears and 6 gears are not used. This is because the air cleaning capabilities of 3 th and 4 th gears are close and the air cleaning capabilities of 5 th and 6 th gears are close. Therefore, in the case where the air quality state is "light pollution", only one of the 3 th gear and the 4 th gear is selected as the corresponding operating gear, and it is not necessary to separately divide the 3 rd gear and the 4 th gear into different concentration sections for correspondence. In other words, when the operation program is set, the setting manner shown in table 1 is not necessarily limited to the case where the air quality state is "light pollution", and 4 th gear or 3 rd gear may be selected as the corresponding gear as shown in table 1. Similarly, for the case that the air quality state is "moderate pollution", any gear can be selected from the 5 th gear and the 6 th gear as a corresponding gear, which is not described herein again.
In the above example, in order to ensure the reasonableness of the gear operation and avoid unnecessary gear shift operation caused by occasional data fluctuation, a delay time (for example, 20s) is set for the condition of the gear shift operation, and only if all results obtained within the delay time indicate the gear shift operation, the control device controls the air supply fan and the air exhaust fan to operate at a new gear, otherwise, the gear shift operation is not executed, and the new fan operates continuously only at the currently operating gear.
For example, when the fresh air machine runs at 1 gear, if the PM2.5 measuring device detects that the concentration value of indoor PM2.5 is 35 μ g/m3It became 36. mu.g/m3Then new windThe new gear obtained by the machine is the 2 gear, and the 2 gear is stored as the unchanged gear and is timed; at the moment, the gear change is delayed for 20 seconds, and if the concentration value of PM2.5 obtained in 20 seconds is always larger than 35, the operating gear of the new fan is changed from 1 gear to 2 gear after 20 seconds; if the concentration value of PM2.5 is changed from 36 to 35 or lower in 20 seconds, the operation gear of the fresh air fan keeps the 1 gear unchanged, and gear shifting is not needed. As can be seen from the above example, in step S20, by setting a delay time of 20 seconds for the gear change, unnecessary gear shift operation caused by occasional data fluctuation is avoided, and the running stability of the new fan is ensured.
Step S30, judging whether the running time of the new fan in the same running gear is longer than the maximum running time, if not, executing step S50, and continuing running in the current running gear; if so, step S40 is executed to switch to the ventilation gear operation corresponding to the currently operated gear.
The air cleaning capability of the ventilation gear corresponding to the currently-operated gear used in step S40 is greater than that of the currently-operated gear. Preferably, the ventilation gear is set to be one or more gears which are higher than the currently running gear by at least two steps, so that the air purification capacity of the ventilation gear is far larger than that of the currently running gear.
In step S40, the indoor air is rapidly ventilated by performing the skip-shifting operation on the gear whose operation duration exceeds the maximum operation duration, so as to increase the oxygen content of the indoor air and maintain the oxygen content of the indoor air at a stable level. The comfort level of the indoor air is further ensured while the purification effect of the indoor air is ensured.
In this step, different maximum operating times are set for different gears and correspondingly different ventilation gears. One or more corresponding ventilation gears can be set for the same gear; the ventilation gears corresponding to different gears can be the same, and each ventilation gear is preset with the maximum ventilation time to ensure the ventilation effect.
In step S40, different override operation algorithms are set for different air quality states in consideration of the economy of operation of the new air handling unit. As shown in fig. 3, step S40 further includes the following steps: judging whether the pollutant concentration value is greater than a heavy pollution concentration threshold value, if not, judging that the indoor air does not reach the heavy pollution level, entering step S401, and then executing the algorithm shown in FIG. 4; if the result is yes, the indoor air has reached heavy pollution or more, the process proceeds to step S411, and the algorithm shown in FIG. 5 is executed.
As shown in FIG. 4, for "pollutant concentration ≦ heavy pollution concentration threshold" (e.g., PM2.5 ≦ 150 μ g/m)3) The following algorithm is executed:
s401, acquiring a ventilation gear corresponding to the currently running gear, and acquiring the maximum ventilation time of the ventilation gear;
s402, judging whether the operation time of the ventilation gear is longer than the maximum ventilation time, and if so, returning to the step S10; if not, the step S401 is entered;
s403, acquiring a new pollutant concentration value, and judging whether the new pollutant concentration value is greater than a concentration threshold value corresponding to a ventilation gear; if yes, return to step S20; if not, go to step S404;
s404, the operation in the ventilation gear is continued, and the process returns to step S402.
In step S403, the concentration threshold value corresponding to the ventilation shift position is an upper limit value of the allowable pollutant concentration during the operation in the ventilation shift position. In the process of override operation, when the pollutant concentration value is greater than the concentration threshold value corresponding to the ventilation gear, the override operation program is ended in advance and then the automatic operation program is started; and when the concentration value of the pollutants does not exceed the concentration threshold value corresponding to the ventilation gear, the override operation process is continued until the maximum ventilation time is finished, so that the air purification effect is ensured while the override operation is performed for quick ventilation.
This is because, in the process of the override operation, if the pollutant concentration value is greater than the concentration threshold corresponding to the ventilation gear, it indicates that the air quality is not improved but worsened when the ventilation gear with stronger air purification capability is operated, and therefore, it is necessary to end the override operation procedure in advance, directly return to step S20, and perform the automatic operation after calculating the execution gear by using the delay algorithm; the execution gear obtained at this time should be higher than the originally operated gear, and even higher than the previously operated ventilation gear. In the process of the override operation, if the concentration value of the pollutants does not exceed the concentration threshold value corresponding to the ventilation gear, the air quality is improved, at the moment, the override operation process is returned to the step S10 after being completed according to the maximum ventilation time, a new round of automatic operation is started, the quick ventilation effect can be achieved, and the indoor oxygen content can still be kept at a relatively stable level when the new fan operates at a lower gear for a long time. At this time, the execution gear obtained after the steps S10 and S20 are executed again should be equal to or lower than the original running gear.
As shown in FIG. 5, for "pollutant concentration > heavy pollution concentration threshold" (e.g., PM2.5 > 150 μ g/m)3) The following algorithm is executed:
s411, acquiring a ventilation gear corresponding to the currently operated gear according to the number of times that the same gear reaches the maximum operation time in the same time period, and acquiring the maximum ventilation time of the ventilation gear; the more times that the same gear reaches the maximum operation time in the same time period, the stronger the air purification capacity of the obtained ventilation gear is;
s412, judging whether the operation time of the ventilation gear is longer than the maximum ventilation time, and if so, returning to the step S10; if not, go to step S413;
s413, the operation in the ventilation gear position is continued, and the process returns to step S412.
In the above steps, when the indoor air quality is in 'severe pollution' or 'severe pollution' for a long time, and the indoor air quality is poor, the ventilation gear is operated for the maximum ventilation time through the override operation, so that the indoor air quality can be better improved, and then the automatic operation is performed. The shift position to be executed again after the override operation should be lower than the ventilation shift position, or even lower than the shift position in the previous operation. In step S411, when the continuous operation time of the fresh air machine in the "heavily polluted" or "heavily polluted" state in the same time period reaches two or more maximum operation times, which indicates that the indoor air quality needs to be improved urgently, a higher gear should be called to perform the override operation, so as to supplement the purified air to the indoor more quickly, improve the indoor air quality to a greater extent, and improve the indoor oxygen content at the same time.
In the following, for the case of different air qualities, the following is exemplified,
a. aiming at the condition that the indoor air quality is 'good' and 'good', when continuously running for 20 minutes in the interval of PM2.5 being more than or equal to 0 and less than or equal to 75, automatically switching to 5-gear running for 10 minutes, and recovering to a normal automatic running state after finishing running; the concentration threshold corresponding to the 5 th gear is set to be 75 mu g/m3If the PM2.5 concentration value changes to be more than 75 in the operation 10-minute interval, the corresponding automatic operation state is entered in advance.
b. Aiming at the conditions that the indoor air quality is light pollution and moderate pollution, when the indoor air is continuously operated for 40 minutes in an interval of PM2.5 being more than 75 and less than or equal to 150, the indoor air is automatically switched to 8-gear operation for 5 minutes, and the indoor air is restored to a normal automatic operation state after the operation is finished; the concentration threshold corresponding to the 8-gear is set to be 150 mu g/m3If the PM2.5 concentration value is changed to be less than or equal to 75 within the 5-minute operation interval, continuing the override operation until the 5-minute operation is finished; if the PM2.5 concentration value changes to be more than 150 in the running 5-minute interval, the corresponding automatic running state is entered in advance.
c. Aiming at the conditions that the indoor air quality is 'heavy pollution' and 'heavy pollution', when the indoor air is continuously operated for 40 minutes in an interval of 150 < PM2.5, the indoor air is automatically switched to a 'net 1' gear to operate for 10 minutes, and the indoor air is restored to a normal automatic operation state after the operation is finished;
d. aiming at the conditions that the indoor air quality is 'heavy pollution' and 'heavy pollution', when the indoor air is continuously operated for 80 minutes in the interval of 150 < PM2.5, the indoor air is automatically switched to a 'net 2' gear to operate for 10 minutes, and the indoor air is restored to a normal automatic operation state after the operation is finished.
From the above examples, it can be known that, for the common conditions of "excellent", "good", "light pollution" and "moderate pollution" of air quality status, because indoor pollution is not serious, the air conditioner can operate for a long time at medium and low grades, at this time, fresh air cannot be supplemented in time, and indoor oxygen content is low; purified fresh air can be supplemented into the room in time through the override operation, so that the indoor oxygen content is kept at a stable level. In the process of the off-step gear shifting operation, when the indoor air quality state becomes worse, the air exchange gear which is in operation is directly skipped, and the automatic operation is carried out by the gear corresponding to the real-time PM2.5 concentration; when the indoor air quality state is improved, the air conditioner runs at the ventilation gear for the maximum ventilation time, and then runs at the gear corresponding to the real-time PM2.5 concentration value, so that the quick ventilation effect can be ensured, and the oxygen content can be supplemented in time while the air purification effect is ensured. Aiming at the rare condition that the air quality state is 'heavy pollution' and 'heavy pollution', because the indoor pollution is serious, in the process of the override shift operation, the air quality can be improved to the maximum extent by operating the ventilation gear which is in operation for the maximum ventilation time and then operating the ventilation gear corresponding to the real-time PM2.5 concentration no matter how the indoor air quality state changes.
As shown in fig. 6, in an embodiment of the present invention, a control system for a fresh air machine includes: pollutant concentration measuring means (e.g., PM2.5 measuring means) for measuring a pollutant concentration value of indoor air; and a control device 52 for controlling the operation gears of the air supply fan and the air exhaust fan according to the control method.
Specifically, the control device is used for automatically controlling the operation gears of the exhaust fan and the air supply fan by utilizing a delay algorithm according to the concentration value of the indoor air pollutants. And the control device is also used for controlling the operation gear of the fresh air fan according to the operation time of the fresh air fan at the same gear, and when the operation time of the fresh air fan at the same operation gear is judged to exceed the maximum operation time corresponding to the operation gear, the fresh air fan is switched to the ventilation gear with stronger purification capacity to operate in a cross-stage mode, and the air is quickly ventilated, so that the purified outdoor air is timely supplemented to the indoor air, and the indoor oxygen content is kept at a stable level.
The specific working principle of the control system for the fresh air machine provided by the invention is similar to that of the control method for the fresh air machine, and the detailed description is omitted here.
Correspondingly, the invention also provides a fresh air fan, which comprises the control system for the fresh air fan.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by hardware related to program instructions, where the program is stored in a storage medium and includes several instructions to enable a single chip (which may be a chip, etc.) or a processor to execute all or part of the steps of the method according to the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In summary, the present invention provides a control method, a control system and a fresh air machine for a fresh air machine, wherein a control device can automatically control an operation gear of the fresh air machine according to a single index of an indoor pollutant concentration value, and timely switch the currently operated gear to an air exchange gear for override operation by detecting the operation duration of the fresh air machine at the same gear, so as to rapidly supplement purified air to the indoor, so that the oxygen content of the indoor air can be maintained at a relatively stable level, thereby ensuring the comfort level of the indoor air, and the control method and the control system are suitable for being used in places such as houses, markets and the like. Compared with the control of the fresh air fan by measuring multiple indexes of indoor air pollution, the control logic is simple, and the cost is low.
The control method and the control system for the fresh air machine and the fresh air machine provided by the invention are described in detail above. Any obvious modifications to the invention, which would occur to those skilled in the art, without departing from the true spirit of the invention, would constitute a violation of the patent rights of the invention and would carry a corresponding legal responsibility.

Claims (9)

1. A control method for a fresh air machine is characterized by comprising the following steps:
(1) measuring a pollutant concentration value of indoor air;
(2) calculating a concentration interval to which the pollutant concentration value belongs, generating an execution gear by using a delay algorithm, and automatically operating;
wherein the step (2) comprises the following substeps:
(21) calculating a concentration interval to which the pollutant concentration value belongs, and acquiring a gear corresponding to the concentration interval to which the pollutant concentration value belongs as a new gear;
(22) acquiring a currently running gear, and judging whether a new gear is the same as the currently running gear or not; if the result is no, entering the step (23); if yes, entering step (24);
(23) storing the new gear as an unchanged gear, timing, and judging whether the timed length reaches a preset delay time or not; if so, executing a gear shifting operation, controlling the fresh air fan to start running at a new gear, and then returning to the step (1); if the result is negative, the gear shifting operation is not executed, the current running gear is still used for running, and the step (3) is carried out;
(24) judging whether an unchanged gear is stored or not, if not, continuing to operate with the currently operated gear, and then entering the step (3); if so, stopping timing, deleting the unchanged gears, operating the gears in the currently operated gear, and then entering the step (3);
(3) judging whether the running time of the new fan at the same running gear is longer than the set maximum running time or not, and if not, continuing running at the current running gear; if yes, entering the step (4);
(4) the method comprises the steps of switching to a ventilation gear corresponding to a currently running gear for running, wherein the ventilation gear is a gear higher than the currently running gear, and the air purification capacity of the ventilation gear is greater than that of the currently running gear;
wherein, the step (4) comprises the following steps: judging whether the concentration value of the pollutants is greater than a heavy pollution concentration threshold value, if so, judging that the indoor air is heavily polluted or seriously polluted, and entering a step (411);
(411) acquiring a ventilation gear corresponding to the currently operated gear according to the number of times that the same gear reaches the maximum operation time in the same time period, and acquiring the maximum ventilation time of the ventilation gear; the more times that the same gear reaches the maximum operation time in the same time period, the stronger the air purification capacity of the acquired ventilation gear is;
(412) judging whether the operation time of the ventilation gear is longer than the maximum ventilation time or not, if so, returning to the step (1); if not, entering step (413);
(413) operation in the ventilation gear is continued and step (412) is returned.
2. The control method according to claim 1, characterized in that:
dividing a pollutant concentration value into a plurality of concentration intervals which are changed from low to high in advance according to the air quality state, wherein each concentration interval has a unique gear corresponding to the concentration interval, and the gear corresponding to each concentration interval has air purification capacity matched with the pollution degree of the concentration interval;
in step (21), the measured pollutant concentration value is compared with the critical end point value of each concentration interval, the concentration interval to which the pollutant concentration value belongs is calculated, and then the gear corresponding to the concentration interval is obtained as a new gear.
3. The control method according to claim 2, characterized in that:
in the gear corresponding to each concentration interval, the air supply voltage is always greater than the air exhaust voltage, so that the indoor air always keeps a micro-positive pressure operation mode.
4. The control method according to claim 2, characterized in that:
the control device of the fresh air fan is provided with a plurality of gears for respectively increasing the air supply voltage and the air exhaust voltage step by step, and is also provided with an ultra-clean gear with stronger purification capacity, wherein the air supply fan keeps full load operation in the ultra-clean gear, and the air exhaust fan selects the middle-low air exhaust voltage for operation.
5. The control method according to claim 1, characterized in that the step (4) further comprises the steps of: judging whether the concentration value of the pollutants is greater than a threshold value of the concentration of the heavy pollutants, if not, judging that the indoor air does not reach the level of the heavy pollutants, and entering a step (401);
(401) acquiring a ventilation gear corresponding to the currently running gear, and acquiring the maximum ventilation time of the ventilation gear;
(402) judging whether the operation time of the ventilation gear is longer than the maximum ventilation time or not, if so, returning to the step (1); if the result is negative, entering the step (403);
(403) acquiring a new pollutant concentration value, and judging whether the new pollutant concentration value is greater than a concentration threshold value corresponding to a ventilation gear; if yes, returning to the step (2); if the result is negative, entering the step (404);
(404) operation in the ventilation gear is continued and the process returns to step (402).
6. The control method according to claim 1, characterized in that in step (3), different maximum operating times are set for different gears.
7. The control method according to claim 1, characterized in that in the step (4), for different gear positions, a single or a plurality of ventilation gear positions corresponding thereto are set; the ventilation gears corresponding to different gears can be the same, and each ventilation gear is preset with the maximum ventilation time.
8. A control system for a fresh air machine for implementing the control method of any one of claims 1 to 7, characterized by comprising:
pollutant concentration measuring device, is used for measuring the indoor air pollutant concentration value;
and the control device is used for controlling the running gears of the air supply fan and the air exhaust fan according to the control method.
9. A new fan characterized by comprising the control system of claim 8.
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