Control method of range hood

Abstract

According to the control method of the range hood, the range hood comprises a machine shell, an oil smoke suction fan is installed in the machine shell, a left air inlet and a right air inlet are formed in the lower portion of the machine shell, a left smoke guide plate is installed at the left air inlet, and a right smoke guide plate is installed at the right air inlet; an air quality sensor capable of detecting the oil smoke concentration is installed on the left side wall or the right side wall of the machine shell, and according to the control method, the left side cooking position probability and the right side cooking position probability of the kitchen range can be obtained by calculating the concentration change gradient or the sensor response time difference; and then the flow of the left air inlet and the right air inlet is distributed or air volume gear compensation is carried out. According to the range hood, the air quality sensor is installed on the side wall of the machine shell, after flow distribution and gear compensation are carried out according to different cooking position probabilities, the oil smoke locking capacity can be improved when the double stoves are used at the same time, oil smoke escape is reduced, the intelligent degree of the range hood can be improved, and the range hood is convenient to use. The cooking scene can be intelligently judged, and the cooking experience of a user is improved.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a control method for a range hood. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, the impact of kitchen air quality on human health has received increasing attention. As a key appliance in the kitchen for removing cooking fumes, the function of range hoods is no longer limited to simply extracting fumes. More and more range hoods are integrating air monitoring functions, such as air management systems, to monitor pollutants like TVOC (Total Volatile Organic Compounds) and PM2.5, as well as other odors in the kitchen environment, and automatically adjust the range hood's operation to meet users' needs for a healthy kitchen environment and create a healthier and more comfortable cooking environment. However, current products on the market still have many technical shortcomings that need to be addressed in terms of sensor placement, fume control effectiveness, and the implementation of intelligent functions, making it difficult to meet users' needs for a healthy cooking experience and efficient equipment utilization.

[0003] Firstly, regarding the installation layout of sensors used to monitor cooking-related parameters, existing manufacturers generally place these sensors on the front panel of the range hood or near the air inlet. While this installation method facilitates the sensor's perception of the cooking area to some extent, the close proximity of the front panel and air inlet to the cooking area makes it easy for large amounts of grease generated during cooking to adhere to the sensor surface, causing sensor contamination. Actual testing has verified that sensors located in this area are affected by grease, resulting in a shorter lifespan. This not only requires users to frequently replace sensors to maintain normal equipment function, increasing operating costs, but also may cause the range hood to fail to accurately respond to cooking needs due to sensor failure, affecting the oil fume purification effect.

[0004] Secondly, current mainstream range hoods have significant shortcomings in terms of fume control and intelligent adaptation: Firstly, in scenarios where two stoves are used simultaneously, existing range hoods are insufficient in capturing fumes, resulting in a fume escape rate exceeding 30%. A large amount of uncaptured fumes diffuses into the kitchen space, not only polluting indoor air but also potentially posing a threat to the user's respiratory health, while also increasing the difficulty of kitchen cleaning; secondly, physical baffles designed to improve fume capture efficiency cannot automatically adjust according to dynamic changes in the main cooking area; thirdly, some manufacturers have attempted to use camera monitoring technology to achieve location functionality for the main cooking area, but this solution carries serious privacy risks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a control method for a range hood that can intelligently identify the user's main cooking direction and adaptively adjust the air volume, in light of the above-mentioned existing technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a control method for a range hood, the range hood including a casing, a fume extraction fan installed inside the casing, a left air inlet and a right air inlet located at the lower part of the casing, a left smoke guide plate installed at the left air inlet and a right smoke guide plate installed at the right air inlet, characterized in that: an air quality sensor capable of detecting the concentration of cooking fumes is installed on the left or right side wall of the casing, the control method can determine the position probability of cooking on the left and right sides of the stove by calculating the concentration change gradient or the sensor response time difference, and then distribute the flow rate of the left and right air inlets or perform air volume level compensation.

[0007] As a preferred approach, the steps for calculating the cooking location probability based on the concentration change gradient are as follows:

[0008] S11. The air quality sensor detected a concentration change event;

[0009] S12, The controller calculates the concentration gradient change;

[0010] S13. Determine whether the change in concentration gradient is greater than the threshold.

[0011] If so, record the event time and proceed to step S14;

[0012] If not, continue monitoring;

[0013] S14. Compare with historical data;

[0014] S15. Calculate the probability of cooking on the left and right sides of the stove.

[0015] Further optimization, in step S15, defines the location probability model: ,in, The probability of cooking position on the left; As time weight, ; ( ) is the time matching function, if | - |<3min, then Otherwise, it is 0; This is the timestamp of the current event. is the average time of historical events; k is the sequence number of the historical event.

[0016] As another preferred approach, the steps for calculating the probability of the cooking location based on the sensor response time difference are as follows:

[0017] S21. Obtain the stove ignition time t0;

[0018] S22, Detect the air quality sensor response time t1;

[0019] S23. Calculate ∆t = t1 - t0;

[0020] S24. Determine whether ∆t≤threshold holds true;

[0021] If so, then the left side of the stove is designated as the main cooking area;

[0022] If not, then the cooking area is determined to be the right side of the stove.

[0023] Further optimization involves distributing the airflow between the left and right air inlets by adjusting the opening of the left and right smoke guide plates. The opening of the left smoke guide plate is expressed by the formula: The opening degree of the right smoke guide plate is expressed by the formula: ,in, To preset the basic opening of the smoke guide plate, This is the gain coefficient. The minimum opening of the smoke guide plate on one side is ≥ 10%. This setting avoids both sides of the smoke guide plate from opening to their maximum opening, and also ensures that the smoke guide plate on the other side retains its minimum opening when cooking on one side.

[0024] Further optimization involves the following steps for flow distribution based on concentration change gradients:

[0025] S31, System startup;

[0026] S32, Air quality sensor preheating;

[0027] S33, Air quality sensor outputs pollutant concentration;

[0028] S34. Calculate the concentration change gradient;

[0029] S35. Determine whether the concentration change gradient is greater than the set threshold.

[0030] If so, record the timestamp and enter step S36;

[0031] If not, maintain the opening of the left and right smoke guide plates and keep the fume extraction fan in operation;

[0032] S36. Database query and calculation ;

[0033] S37. Calculate the opening of the left and right smoke guide plates;

[0034] S38. Adjust the opening of the smoke guide plate to regulate the flow rate;

[0035] S39, Waiting for the next cycle.

[0036] Further optimization involves the following steps for flow allocation based on sensor response time differences:

[0037] S41. Ignition of the stove;

[0038] S42. Start timing and obtain the stove ignition time t0;

[0039] S43. Determine whether the concentration change gradient is greater than the set threshold.

[0040] If so, record the air quality sensor response time t1, and then proceed to step S44;

[0041] If not, continue monitoring;

[0042] S44. Calculate the time difference ∆t = t1 - t0;

[0043] Determine whether the condition ∆t≤threshold holds true;

[0044] If so, it is determined that the left-hand cooking is the main method, and then proceed to step S45;

[0045] If so, it is determined that the cooking is done by the right main cook, and then proceed to step S46;

[0046] S45, left guide plate opening 50%+x%, right smoke guide plate opening 50%-x%;

[0047] S46, Right guide plate opening 50%+x, Left smoke guide plate opening 50%-x%;

[0048] Where 15≤x≤25.

[0049] There are various ways to compensate for airflow settings. Preferably, the airflow setting compensation includes the following steps:

[0050] S51, System Startup;

[0051] S52, Air quality sensor preheating;

[0052] S53, Air quality sensor outputs pollutant concentration;

[0053] S54. Calculate the concentration change gradient;

[0054] S55. Determine whether the concentration change gradient is greater than the set threshold.

[0055] If so, record the timestamp and enter step S56;

[0056] If not, maintain the opening of the left and right smoke guide plates and maintain the current setting of the range hood;

[0057] S56. Database query and calculation ;

[0058] S57. Compare the probabilities of the cooking positions on the left and right sides, and output the main cooking direction;

[0059] S58. Check whether the airflow interference source side is consistent with the main cooking side;

[0060] If so, the range hood will remain at the current setting, and then proceed to step S59;

[0061] If not, the range hood speed will be increased, and then proceed to step S59;

[0062] S59. Waiting for the next testing cycle.

[0063] Range hoods can have various structures. Preferably, the range hood includes an upper housing and an air inlet body. The range hood fan is installed inside the upper housing. The air inlet body has a left air inlet and a right air inlet. The left smoke guide plate and the right smoke guide plate are installed on the air inlet body.

[0064] The air quality sensor can be installed in multiple different locations. Preferably, the air inlet body has a mounting cavity on its left or right outer wall, the air quality sensor is installed inside the mounting cavity, and an oil-proof component is installed at the opening of the mounting cavity.

[0065] Compared with existing designs, the advantages of this invention are as follows: By installing an air quality sensor on the side wall of the casing, the control method can calculate the probability of cooking on the left and right sides of the stove by calculating the concentration change gradient or the sensor response time difference. This allows for the allocation of airflow between the left and right air inlets or compensation of airflow levels, which is beneficial for energy saving. It not only improves the ability to lock in oil fumes when both stoves are used at the same time, reducing oil fume escape and ensuring the long-term cleanliness of the cabinets on both sides of the range hood, but also enhances the intelligence of the range hood, enabling it to intelligently judge the cooking scenario and improve the user's cooking experience. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the installation structure of a range hood according to an embodiment of the present invention;

[0067] Figure 2 This is a schematic diagram illustrating a usage scenario of the range hood according to an embodiment of the present invention;

[0068] Figure 3 This is a schematic diagram of the sensor mounting structure according to an embodiment of the present invention;

[0069] Figure 4 This is a schematic diagram of the oil fume detection system according to an embodiment of the present invention;

[0070] Figure 5 This is a schematic diagram of the process for calculating the probability of cooking location based on the concentration change gradient in an embodiment of the present invention;

[0071] Figure 6 This is a schematic diagram of the process for calculating the sensor response time difference in an embodiment of the present invention;

[0072] Figure 7 This is a schematic diagram of the process for calculating the probability of cooking position based on the sensor response time difference in an embodiment of the present invention;

[0073] Figure 8 This is a schematic diagram of the process of allocating traffic based on the probability of cooking location in an embodiment of the present invention;

[0074] Figure 9 This is a schematic diagram illustrating the process of supplementing airflow settings based on the probability of cooking location in an embodiment of the present invention.

[0075] Figure 10 This is a schematic diagram of the flow distribution based on sensor response time difference in an embodiment of the present invention. Detailed Implementation

[0076] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0077] like Figures 1 to 3 As shown, the range hood in this embodiment includes a housing 1, an upper casing 11, and an air inlet 12. A range hood fan 2 is installed inside the upper casing 11. The air inlet 12 has a left air inlet and a right air inlet. A left smoke guide plate 3 and a right smoke guide plate 4 are installed on the air inlet 12. The left smoke guide plate 3 is located at the left air inlet, and the right smoke guide plate 4 is located at the right air inlet. The flow rate of the corresponding air inlet is adjusted by regulating the opening of the left smoke guide plate 3 and the right smoke guide plate 4. In this embodiment, an installation cavity 6 is provided on the left outer wall of the air inlet 12. An air quality sensor 5 is installed inside the installation cavity 6 to detect the concentration of cooking fumes. A semiconductor MOS sensor is preferably used. An oil-proof component 7 is installed at the opening of the installation cavity 6. The oil-proof component 7 is preferably a grille with a hole diameter or slit width of 0.5-3mm, which can block large oil particles, prevent sensor contamination, improve detection accuracy, and extend the sensor's service life.

[0078] like Figure 4 As shown, the air quality sensor 5 is electrically connected to the signal processor, which in turn is electrically connected to the main control MCU (controller). The output signal from the air quality sensor 5 is processed by the signal processor and then read by the controller. The controller then drives the left and right smoke guide plates to rotate via a drive motor, thus adjusting the opening degree. The controller can also adjust the speed of the range hood fan, thereby adjusting the range hood's speed setting.

[0079] The control method in this embodiment can calculate the position probability of cooking on the left and right sides of the stove by calculating the concentration change gradient or the sensor response time difference, and then distribute the airflow to the left and right air inlets or perform airflow level compensation.

[0080] like Figure 5 As shown, the steps for calculating the probability of the cooking location based on the concentration change gradient are as follows:

[0081] S11, Air quality sensor 5 detected a concentration change event;

[0082] S12, The controller calculates the concentration gradient change;

[0083] S13. Determine whether the change in concentration gradient is greater than the threshold.

[0084] If so, record the event time and proceed to step S14;

[0085] If not, continue monitoring;

[0086] S14. Compare with historical data;

[0087] S15. Calculate the probability of cooking on the left and right sides of the stove.

[0088] This involves analyzing the timing of each detected surge in cooking fumes to learn when users typically use the left or right stovetop. The system then predicts which stovetop is currently being used (initially, the user needs to specify this), and the prediction becomes increasingly accurate over time. For example, if a user consistently uses the left stovetop for breakfast at 8 AM and the right stovetop for coffee at 7 AM, the system will remember this pattern. If a sudden surge in cooking fumes is detected at 7:05 AM on a particular day, the system will determine that the right stovetop is most likely in use.

[0089] In step S15, the location probability model is defined: ,in, The probability of cooking on the left is set to a value of 0-1; For time weighting, set the value to ; ( ) is the time matching function, if | - |<3min, then Otherwise, it is 0; The timestamp for the current event is the time of the range hood system. The average time between historical events is calculated using database statistics; k is the sequence number of the historical event, i.e., the most recent event (k=1 is the most recent event), k=1, 2, 3...

[0090] Example of judgment: Suppose the system records the three most recent events:

[0091] k=1, historical average time The most recent time was 07:03:15, with a weight of ;

[0092] k=2, historical average time The time was 07:05:40 (the last two times), with a weight of ;

[0093] k=3, historical average time The times are 07:10:20 (last 3 times), weights ;

[0094] Scenario 1: Current time is 07:05:30. If a 3-minute threshold is used for judgment,

[0095] and Difference ;

[0096] and Difference ;

[0097] and Difference ;

[0098] Calculate: Numerator = (0.82×1) + (0.67×1) + (0.55×0) = 1.49; Denominator = 0.82 + 0.67 + 0.55 = 2.04; = 1.49 ÷ 2.04 ≈ 0.73, meaning the probability of cooking on the left is 73%.

[0099] like Figure 6 and Figure 7 As shown, the steps for calculating the probability of the cooking location based on the sensor response time difference are as follows:

[0100] S21. Obtain the stove ignition time t0;

[0101] S22, Detect the response time t1 of air quality sensor 5;

[0102] S23, Calculation ;

[0103] S24. Judgment Does the threshold hold?

[0104] If so, then the left side of the stove is designated as the main cooking area;

[0105] If not, then the cooking area is determined to be the right side of the stove.

[0106] In step S21, the stove ignition signal can be obtained through the linkage between the range hood and the stove.

[0107] In step S22, the sensor response refers to the point of sudden increase in concentration, i.e., dC / dt > threshold.

[0108] Most range hoods nowadays have a linkage between the hood and the cooktop, which can know the ignition time of the cooktop. Therefore, the main cooking direction can be determined by using the time difference between the ignition time and the fluctuation detected by the air quality sensor installed on one side.

[0109] L: Distance from the stove to the sensor (meters);

[0110] v: The speed at which oil fumes diffuse (v≈0.5m / s);

[0111] Δt: The time difference (in seconds) between the ignition of the stove and the response of the sensor, Δt = L / v;

[0112] In this embodiment, the air quality sensor 5 is installed on the left side of the range hood. The distance L between the left stove and the sensor is 0.6m. The theoretical value is 1.2s, while the actual measurement is 1.0~1.4s. The distance L between the right stove and the sensor is 1.2m. The theoretical value is 2.4s, while the actual measured value is 2.0~2.8s.

[0113] like Figure 8 As shown, flow allocation based on concentration change gradient includes the following steps:

[0114] S31, System startup;

[0115] S32, Air quality sensor 5 preheating;

[0116] S33, Air Quality Sensor 5 outputs pollutant concentration;

[0117] S34. Calculate the concentration change gradient;

[0118] S35. Determine whether the concentration change gradient is greater than the set threshold.

[0119] If so, record the timestamp and enter step S36;

[0120] If not, maintain the opening of the left smoke guide plate 3 and the right smoke guide plate 4, and maintain the state of the fume extraction fan 2;

[0121] S36. Database query and calculation ;

[0122] S37. Calculate the opening of the left smoke guide plate 3 and the right smoke guide plate 4;

[0123] S38. Adjust the opening of the smoke guide plate to regulate the flow rate;

[0124] S39, Waiting for the next cycle.

[0125] The airflow distribution between the left and right air inlets is achieved by adjusting the opening of the left and right smoke guide plates 3 and 4. The opening can be increased on the main cooking side to enlarge the air intake area, thus directing the main airflow to that side. The opening of the left smoke guide plate 3 is expressed by the formula: The opening degree of the right smoke guide plate 4 is expressed by the formula: ,in, The preset basic opening of the smoke guide plate is set to, for example, 45%. For example, the gain coefficient, = 0.5% / ppm; To avoid the situation where both sides of the smoke guide plate are fully opened to the maximum; the minimum opening of the smoke guide plate on one side should be ≥ 10% to avoid the smoke guide plate on one side being completely closed. Even if cooking on one side, there is still a possibility that oil fumes will escape from the other side, so the other side needs to retain a certain minimum opening.

[0126] As shown in Figure 9, the airflow level compensation in this embodiment includes the following steps:

[0127] S51, System Startup;

[0128] S52, Air Quality Sensor 5 preheating;

[0129] S53, Air Quality Sensor 5 outputs pollutant concentration;

[0130] S54. Calculate the concentration change gradient;

[0131] S55. Determine whether the concentration change gradient is greater than the set threshold.

[0132] If so, record the timestamp and enter step S56;

[0133] If not, maintain the opening of the left smoke guide plate 3 and the right smoke guide plate 4, and maintain the current setting of the range hood;

[0134] S56. Database query and calculation ;

[0135] S57. Compare the probabilities of the cooking positions on the left and right sides, and output the main cooking direction;

[0136] S58. Check whether the airflow interference source side is consistent with the main cooking side;

[0137] If so, the range hood will remain at the current setting, and then proceed to step S59;

[0138] If not, the range hood speed will be increased, and then proceed to step S59;

[0139] S59. Waiting for the next testing cycle.

[0140] If the user is cooking on the left side, the source of interference is the airflow from the window on the left. Generally, the airflow comes in from the window (left side → right side). Therefore, even if the fumes are blown by the interference when cooking on the left side (the same side as the source of interference), they will blow to the right. At this time, the right side (the middle position of the range hood) is the control area of ​​the range hood. Therefore, the range hood can maintain the current setting.

[0141] If the user is cooking on the left side, and the source of interference is airflow from the window on the right side, the fumes generated by cooking on the left side will continue to blow from the right to the left (the left side of the range hood is the outside), and cannot be effectively sucked away, causing them to escape. Therefore, it is necessary to increase the speed.

[0142] like Figure 10 As shown, flow allocation based on sensor response time difference includes the following steps:

[0143] S41. Ignition of the stove;

[0144] S42. Start timing and obtain the stove ignition time t0;

[0145] S43. Determine whether the concentration change gradient is greater than the set threshold.

[0146] If so, record the response time t1 of the air quality sensor 5, and then proceed to step S44;

[0147] If not, continue monitoring;

[0148] S44. Calculate the time difference ;

[0149] judge Does the threshold hold?

[0150] If so, it is determined that the left-hand cooking is the main method, and then proceed to step S45;

[0151] If so, it is determined that the cooking is done by the right main cook, and then proceed to step S46;

[0152] S45, left guide plate opening 50%+x%, right smoke guide plate opening 50%-x%;

[0153] S46, Right guide plate opening 50%+x%, Left smoke guide plate 3 opening 50%-x%;

[0154] Where 15≤x≤25, preferably x=20.

[0155] In addition, the range hood can be controlled by a voice module, which is equipped with a control module, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

Claims

1. A control method for a range hood, the range hood comprising a housing (1), a range hood fan (2) installed inside the housing (1), a left air inlet and a right air inlet located at the lower part of the housing (1), a left smoke guide plate (3) installed at the left air inlet, and a right smoke guide plate (4) installed at the right air inlet, characterized in that: An air quality sensor (5) capable of detecting the concentration of cooking fumes is installed on the left or right side wall of the casing (1). This control method can calculate the probability of cooking on the left and right sides of the stove by calculating the concentration change gradient or the sensor response time difference, and then distribute the flow of the left and right air inlets or perform air volume level compensation.

2. The control method for a range hood according to claim 1, characterized in that: The steps for calculating the probability of cooking location based on the concentration change gradient are as follows: S11, Air quality sensor (5) detected a concentration change event; S12, The controller calculates the concentration gradient change; S13. Determine whether the change in concentration gradient is greater than the threshold. If so, record the event time and proceed to step S14; If not, continue monitoring; S14. Compare with historical data; S15. Calculate the probability of cooking on the left and right sides of the stove.

3. The control method for a range hood according to claim 2, characterized in that: In step S15, the location probability model is defined: ,in, The probability of cooking position on the left; As time weight, ; ( ) is the time matching function, if | - |<3min, then Otherwise, it is 0; This is the timestamp of the current event. is the average time of historical events; k is the sequence number of the historical event.

4. The control method for a range hood according to claim 1, characterized in that: The steps for calculating the probability of cooking location based on sensor response time difference are as follows: S21. Obtain the stove ignition time t0; S22, Detect the response time t1 of the air quality sensor (5); S23, Calculation ; S24. Judgment Does the threshold hold? If so, then the left side of the stove is designated as the main cooking area; If not, then the cooking area is determined to be the right side of the stove.

5. The control method for a range hood according to claim 1, characterized in that: The airflow distribution between the left and right air inlets is achieved by adjusting the opening of the left smoke guide plate (3) and the right smoke guide plate (4). The opening of the left smoke guide plate (3) is expressed by the formula: ; The opening degree of the right smoke guide plate (4) is expressed by the formula: ,in, To preset the basic opening of the smoke guide plate, This is the gain coefficient. The minimum opening of the single-sided smoke guide plate is ≥ 10%.

6. The control method for a range hood according to claim 5, characterized in that: Flow allocation based on concentration change gradients includes the following steps: S31, System startup; S32, Air quality sensor (5) preheating; S33, Air quality sensor (5) outputs pollutant concentration; S34. Calculate the concentration change gradient; S35. Determine whether the concentration change gradient is greater than the set threshold. If so, record the timestamp and enter step S36; If not, maintain the opening of the left smoke guide plate (3) and the right smoke guide plate (4) and maintain the state of the fume extraction fan (2); S36. Database query and calculation ; S37. Calculate the opening of the left smoke guide plate (3) and the right smoke guide plate (4); S38. Adjust the opening of the smoke guide plate to regulate the flow rate; S39, Waiting for the next cycle.

7. The control method for a range hood according to claim 5, characterized in that: Flow allocation based on sensor response time difference includes the following steps: S41. Ignition of the stove; S42. Start timing and obtain the stove ignition time t0; S43. Determine whether the concentration change gradient is greater than the set threshold. If so, record the air quality sensor (5) response time t1, and then proceed to step S44; If not, continue monitoring; S44. Calculate the time difference ; judge Does the threshold hold? If so, it is determined that the left-hand cooking is the main method, and then proceed to step S45; If so, it is determined that the cooking is done by the right main cook, and then proceed to step S46; S45, left guide plate opening 50%+x%, right smoke guide plate (4) opening 50%-x%; S46, Right guide plate opening 50%+x%, Left guide plate (3) opening 50%-x%; Where 15≤x≤25.

8. The control method for a range hood according to claim 1, characterized in that... The airflow level compensation includes the following steps: S51, System Startup; S52, Air quality sensor (5) preheating; S53, Air quality sensor (5) outputs pollutant concentration; S54. Calculate the concentration change gradient; S55. Determine whether the concentration change gradient is greater than the set threshold. If so, record the timestamp and enter step S56; If not, maintain the opening of the left smoke guide plate (3) and the right smoke guide plate (4) to maintain the current setting of the range hood; S56. Database query and calculation ; S57. Compare the probabilities of the cooking positions on the left and right sides, and output the main cooking direction; S58. Check whether the airflow interference source side is consistent with the main cooking side; If so, the range hood will remain at the current setting, and then proceed to step S59; If not, the range hood speed will be increased, and then proceed to step S59; S59. Waiting for the next testing cycle.

9. The control method for a range hood according to claim 1, characterized in that: The range hood includes an upper housing (11) and an air inlet (12). The range hood fan (2) is installed inside the upper housing (11). The air inlet (12) has a left air inlet and a right air inlet. The left smoke guide plate (3) and the right smoke guide plate (4) are installed on the air inlet (12).

10. The control method for a range hood according to claim 9, characterized in that: An installation cavity (6) is provided on the left or right outer wall of the air inlet (12), the air quality sensor (5) is installed inside the installation cavity (6), and an oil-proof component (7) is installed at the opening of the installation cavity (6).

Images