A method and system for synergistically regulating the wind speed and ultraviolet power of an extractor hood

Abstract

The application discloses a kind of range hood wind speed and ultraviolet power synergic control method and system, belong to intelligent range hood control technical field, comprising: real-time acquisition of oil fume concentration;The oil fume concentration is substituted into the pre-stored fan control model to obtain target fan wind speed;Oil fume concentration and target fan wind speed are substituted into the pre-stored ultraviolet control model to obtain target ultraviolet power;Fan control model and ultraviolet control model are mathematical relationship established by experiment calibration, and parameter optimization is carried out in the process of establishing to maintain indoor oil fume concentration stable at safety threshold as target;The control signal of target fan wind speed is output to adjust fan speed, while the control signal of target ultraviolet power is output to adjust the emission intensity of ultraviolet module.The application realizes the real-time linkage of fan wind speed and ultraviolet power by establishing accurate mathematical model, ensures that indoor oil fume concentration can be stably controlled below safety threshold under any cooking condition, while realizing energy-saving operation.

Description

Technical Field

[0001] This invention belongs to the field of intelligent range hood control technology, and particularly relates to a method and system for coordinated regulation of range hood fan speed and ultraviolet power. Background Technology

[0002] Currently, household range hoods primarily use negative pressure generated by a fan to expel kitchen fumes outdoors. To purify residual fumes, some high-end models integrate ultraviolet (UV) photolysis modules. However, existing control logic has the following drawbacks:

[0003] Isolated control logic: The fan speed adjustment usually relies only on odor sensors or simple infrared sensors, while the ultraviolet module is often in a normally open state or works independently on a timer, and there is a lack of data interaction and coordination between the two.

[0004] Low energy efficiency: When the concentration of oil fumes is low, the fan often operates at a high power, resulting in a waste of electricity; while when the concentration of oil fumes is high, if the ultraviolet power does not increase in line with the wind speed, the oil fumes passing through the duct will not be completely decomposed, causing secondary pollution.

[0005] Lack of quantitative models: Existing technologies mostly adopt "threshold trigger" control (such as turning on a high setting when the concentration is > a certain value), which lacks the support of continuous mathematical models based on fluid dynamics and photochemical reaction dynamics, resulting in large fluctuations in indoor air quality. Summary of the Invention

[0006] This invention provides a method and system for coordinated control of range hood fan speed and ultraviolet power. By establishing a fan control model and an ultraviolet control model, the real-time linkage between fan speed and ultraviolet power is realized, ensuring that the indoor oil fume concentration can be stably controlled below the safety standard (0.1mg / m³) under any cooking conditions, while achieving energy-saving operation.

[0007] To achieve the above-mentioned objectives, the first objective of this invention is to provide a method for coordinated control of range hood fan speed and ultraviolet power, comprising: Real-time acquisition of oil fume concentration, including the current oil fume concentration value c at the exhaust outlet, the oil fume concentration c1 of the cookware, and the oil fume concentration c2 in the room; Substitute the oil fume concentration into the pre-stored fan control model v(c1, c2) to obtain the target fan speed v; Substitute the oil fume concentration and the target fan speed v into the pre-stored ultraviolet control model P(v, c, c1, c2) to obtain the target ultraviolet power P; The fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2) are mathematical relationships established through experimental calibration, and the establishment process aims to maintain the indoor oil fume concentration at a safe threshold C. set Optimize parameters for the target; The control signal for the target fan speed v is output to adjust the fan speed, and the control signal for the target ultraviolet power P is output to adjust the emission intensity of the ultraviolet module.

[0008] Furthermore, the process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by using quadratic polynomial fitting: ; Where a1 to a5 are the wind turbine control coefficients obtained by quadratic polynomial fitting based on experimental data.

[0009] Furthermore, the process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by logarithmic fitting:

[0010] Where p1 to p8 are the fan control coefficients obtained by logarithmic fitting based on experimental data.

[0011] Furthermore, the process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by exponential fitting:

[0012] Where q1 to q7 are the wind turbine control coefficients obtained by exponential fitting based on experimental data.

[0013] Furthermore, the process of establishing the ultraviolet control model P(v, c, c1, c2) specifically includes: Under the condition of setting a fixed target fan speed v, change the current oil fume concentration value c at the smoke outlet and record the ultraviolet power P required to maintain indoor air quality. The relationship between ultraviolet power P and target fan speed v, oil fume concentration c1 in the boiler, and current oil fume concentration c at the exhaust port was obtained by data fitting:

[0014] Among them, a6 to a 23 The UV power control coefficients are fitted based on experimental data.

[0015] Furthermore, the security threshold C set It is 0.1 mg / m³.

[0016] Furthermore, it also includes closed-loop feedback: real-time monitoring of indoor cooking fume concentration; if the detected value consistently exceeds the safety threshold C... set If the target fan speed v and / or target ultraviolet power P are increased proportionally within a preset time period, the indoor concentration will drop below the threshold.

[0017] The second objective of this invention is to provide a range hood fan speed and ultraviolet power coordinated control system, comprising: The concentration detection module is used to collect the concentration c of oil fumes at the smoke outlet in real time; The core control module stores the fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2). It calculates the target fan speed v based on the oil fume concentration c1 of the cookware and the oil fume concentration c2 in the room, and calculates the ultraviolet power P based on the oil fume concentration and the target fan speed v. The actuator module includes a fan speed control unit and an ultraviolet power drive unit connected to the output of the control core module. The human-computer interaction module is used to set the safety threshold C. set It also displays the current running status.

[0018] Furthermore, the concentration detection module includes: The No. 1 oil fume concentration sensor installed at the air inlet of the range hood obtains the current oil fume concentration value c at the smoke outlet in real time; The No. 2 oil fume concentration sensor installed above the cookware can obtain the oil fume concentration c1 of the cookware in real time. The No. 3 oil fume concentration sensor installed in the room acquires the real-time oil fume concentration c2 in the room.

[0019] Furthermore, the ultraviolet module is an ultraviolet lamp installed in the internal air duct of the range hood. The control core module adjusts the brightness of the ultraviolet lamp through a PWM signal based on the calculated target ultraviolet power P(c), thereby achieving real-time coordination with the fan speed.

[0020] The advantages and positive effects of this application are: This invention uses closed-loop control to strictly lock the indoor oil fume concentration within the healthy threshold of 0.1 mg / m³.

[0021] Compared to traditional technologies, this invention avoids excessive operation of the fan and UV lamp under low load conditions. For example, when a small amount of oil smoke is detected, this invention automatically reduces the fan speed and matches a lower UV power, significantly improving the overall energy efficiency of the unit.

[0022] This invention can reduce the ineffective working time of motors and ultraviolet lamps, thus saving energy. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart of a preferred embodiment of the present invention; Figure 2 This is a system block diagram of a preferred embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1 A method for coordinated control of range hood fan speed and ultraviolet power, mainly including: S1. Real-time acquisition of oil fume concentration, including the current oil fume concentration value c at the exhaust outlet, the oil fume concentration c1 from the cookware, and the oil fume concentration c2 in the room; specifically: Using the No. 1 oil fume concentration sensor installed at the air inlet of the range hood, the current oil fume concentration value c at the exhaust outlet is obtained in real time; The oil fume concentration c1 of the cookware is obtained in real time using the No. 2 oil fume concentration sensor installed above the cookware. The concentration of oil fumes in the room, c2, is obtained in real time using the No. 3 oil fume concentration sensor installed in the room.

[0027] S2. Substitute the oil fume concentration into the pre-stored fan control model v(c1, c2) to obtain the target fan speed v; S3. Substitute the oil fume concentration and the target fan speed v into the pre-stored ultraviolet control model P(v, c, c1, c2) to obtain the target ultraviolet power P; In S2 and S3, the fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2) are mathematical relationships established through experimental calibration, and the establishment process aims to maintain the indoor oil fume concentration at a stable safety threshold C. set Optimize parameters for the target; S4. Output the control signal of the target fan speed v to adjust the fan speed, and at the same time output the control signal of the target ultraviolet power P to adjust the emission intensity of the ultraviolet module.

[0028] The wind turbine control model v(c1, c2) is one of the core models of this invention, and its specific construction process includes: Scheme 1: Based on quadratic polynomial fitting; First, the indoor oil fume concentration C was controlled in the experimental environment. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by using quadratic polynomial fitting: ; Where a1 to a5 are the wind turbine control coefficients obtained by quadratic polynomial fitting based on experimental data.

[0029] For example, the relationship between the fan speed and the cooking fumes c1 and the room fumes c2 was determined through experiments, as shown in Table 1 below; Table 1 shows the data from the first set of experiments.

[0030] After fitting with a quadratic polynomial, we obtain the following values ​​for a1 to a5: 3.150089, 7.932289, -11.5895, 2.69122, and 1.930085, respectively.

[0031] Scheme 2: Based on logarithmic fitting; First, the indoor oil fume concentration C was controlled in the experimental environment. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; Then, logarithmic fitting was used to obtain the relationship between the target fan speed v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room:

[0032] Where p1 to p8 are the fan control coefficients obtained by logarithmic fitting based on experimental data.

[0033] Using the data in Table 1, logarithmic fitting yielded the following values ​​for p1 to p8: 21.5915724851025, 49.5806352765163, 29.2101099158495, -0.286027277344862, -3.05361010486504, 0.871900951620523, 1.3510569134489, and 1.08120206615298.

[0034] Scheme 3: Construction based on exponential fitting; First, the indoor oil fume concentration C was controlled in the experimental environment. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; Then, exponential fitting was used to obtain the relationship between the target fan speed v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room:

[0035] Where q1 to q7 are the wind turbine control coefficients obtained by exponential fitting based on experimental data.

[0036] Using the data in Table 1, the exponential fitting yields the following values ​​for q1 to q7: -47.5947042034476, 0.487326862677665, 0.166935109494234, 27.0599563083048, -1.57005701525689, 1.81089559032224, and 62.6388815029118.

[0037] The process of establishing the ultraviolet control model P(v, c, c1, c2) specifically includes: Under the condition of setting a fixed target fan speed v, change the current oil fume concentration value c at the smoke outlet and record the ultraviolet power P required to maintain indoor air quality. The relationship between ultraviolet power P and target fan speed v, oil fume concentration c1 in the boiler, and current oil fume concentration c at the exhaust port was obtained by data fitting:

[0038] Among them, a6 to a 23 The UV power control coefficients are fitted based on experimental data.

[0039] For example: fix c2 at 0.1 mg / m 3 Find the value of v(c1) for a given c1. The relationship between ultraviolet power P and wind speed v, oil fume concentration c1 in the pot, and oil fume concentration c at the exhaust port was obtained from the experiment, as shown in Table 2 below. Table 2 shows the experimental data for the second group.

[0040] Using the data in Table 2, logarithmic fitting was performed to obtain a6 to a 23 The numbers are as follows: 94672.0209220755, -13822.1390161834, -5447.88107037462, 41498.8589031369, -49.3789544917758, 497.018805407909, -9774.81704073622, 570.404967723166, and 102741.514522249. , 42.0094980237553, 34.0307311738362, 177.887386161137, 38.7306737212364, -59.2948347 721901, 1.22110699175509E-20, -1.57468655339911, -88706.0510732919, 13851.1946834019.

[0041] It also includes closed-loop feedback: real-time monitoring of indoor cooking fume concentration; if the detected value continues to exceed the safety threshold C... set If the target fan speed v and / or target ultraviolet power P are increased proportionally within a preset time period, the indoor concentration will drop below the threshold.

[0042] Please see Figure 2 A range hood fan speed and ultraviolet power coordinated control system, comprising: The concentration detection module is used to collect the concentration c of oil fumes at the smoke outlet in real time; The core control module stores the fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2). It calculates the target fan speed v based on the oil fume concentration c1 of the cookware and the oil fume concentration c2 in the room, and calculates the ultraviolet power P based on the oil fume concentration and the target fan speed v. The actuator module includes a fan speed control unit and an ultraviolet power drive unit connected to the output of the control core module. The human-computer interaction module is used to set the safety threshold C. set It also displays the current running status.

[0043] The concentration detection module includes: The No. 1 oil fume concentration sensor installed at the air inlet of the range hood obtains the current oil fume concentration value c at the smoke outlet in real time; The No. 2 oil fume concentration sensor installed above the cookware can obtain the oil fume concentration c1 of the cookware in real time. The No. 3 oil fume concentration sensor installed in the room acquires the real-time oil fume concentration c2 in the room.

[0044] The ultraviolet module includes an ultraviolet lamp installed in the internal air duct of the range hood. The control core module adjusts the brightness of the ultraviolet lamp through a PWM signal based on the calculated target ultraviolet power P(c), thereby achieving real-time coordination with the fan speed.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for coordinated control of fan speed and ultraviolet power in a range hood, characterized in that, include: Real-time acquisition of oil fume concentration, including the current oil fume concentration value c at the exhaust outlet, the oil fume concentration c1 of the cookware, and the oil fume concentration c2 in the room; Substitute the oil fume concentration into the pre-stored fan control model v(c1, c2) to obtain the target fan speed v; Substitute the oil fume concentration and the target fan speed v into the pre-stored ultraviolet control model P(v, c, c1, c2) to obtain the target ultraviolet power P; The fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2) are mathematical relationships established through experimental calibration, and the establishment process aims to maintain the indoor oil fume concentration at a safe threshold C. set Optimize parameters for the target; The control signal for the target fan speed v is output to adjust the fan speed, and the control signal for the target ultraviolet power P is output to adjust the emission intensity of the ultraviolet module.

2. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, The process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by using quadratic polynomial fitting: ； Where a1 to a5 are the wind turbine control coefficients obtained by quadratic polynomial fitting based on experimental data.

3. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, The process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by logarithmic fitting: Where p1 to p8 are the fan control coefficients obtained by logarithmic fitting based on experimental data.

4. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, The process of establishing the wind turbine control model v(c1, c2) specifically includes: In the experimental environment, the indoor oil fume concentration C was controlled. indoor Stabilized at the safety threshold C set Change the current oil fume concentration value c at the smoke outlet and record the corresponding optimal target fan speed v; The relationship between the target fan velocity v and the concentration of cooking fumes c1 and the concentration of cooking fumes c2 in the room was obtained by exponential fitting: Where q1 to q7 are the wind turbine control coefficients obtained by exponential fitting based on experimental data.

5. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, The process of establishing the ultraviolet control model P(v, c, c1, c2) specifically includes: Under the condition of setting a fixed target fan speed v, change the current oil fume concentration value c at the smoke outlet and record the ultraviolet power P required to maintain indoor air quality. The relationship between ultraviolet power P and target fan speed v, oil fume concentration c1 in the boiler, and current oil fume concentration c at the exhaust port was obtained by data fitting: Among them, a6 to a 23 The UV power control coefficients are fitted based on experimental data.

6. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, The security threshold C set It is 0.1 mg / m³.

7. The method for coordinated control of range hood fan speed and ultraviolet power according to claim 1, characterized in that, It also includes closed-loop feedback: real-time monitoring of indoor cooking fume concentration; if the detected value continues to exceed the safety threshold C... set If the target fan speed v and / or target ultraviolet power P are increased proportionally within a preset time period, the indoor concentration will drop below the threshold.

8. A range hood fan speed and ultraviolet power coordinated control system, characterized in that, include: The concentration detection module is used to collect the concentration c of oil fumes at the smoke outlet in real time; The core control module stores the fan control model v(c1, c2) and the ultraviolet control model P(v, c, c1, c2). It calculates the target fan speed v based on the oil fume concentration c1 of the cookware and the oil fume concentration c2 in the room, and calculates the ultraviolet power P based on the oil fume concentration and the target fan speed v. The actuator module includes a fan speed control unit and an ultraviolet power drive unit connected to the output of the control core module. The human-computer interaction module is used to set the safety threshold C. set It also displays the current running status.

9. The range hood fan speed and ultraviolet power coordinated control system according to claim 8, characterized in that, The concentration detection module includes: The No. 1 oil fume concentration sensor installed at the air inlet of the range hood obtains the current oil fume concentration value c at the smoke outlet in real time; The No. 2 oil fume concentration sensor installed above the cookware can obtain the oil fume concentration c1 of the cookware in real time. The No. 3 oil fume concentration sensor installed in the room acquires the real-time oil fume concentration c2 in the room.

10. The range hood fan speed and ultraviolet power coordinated control system according to claim 8, characterized in that, The ultraviolet module is an ultraviolet lamp installed in the internal air duct of the range hood. The control core module adjusts the brightness of the ultraviolet lamp through a PWM signal based on the calculated target ultraviolet power P(c), so as to achieve real-time coordination with the fan speed.

Images