A method for controlling the motor speed of a smoking device by using the amount of oil smoke escaping, and a smoking device

Abstract

A method for controlling the motor speed of a smoking device by the amount of oil smoke escaping, when the real-time detection result of the amount of oil smoke escaping A meets the following conditions: (A n+1 ‑A n ) / A n ≥10%, the rate of change of the motor speed R is consistent with the rate of change of the oil smoke escape amount A, that is, it meets the following relationship: x(A n+1 ‑A n ) / A n =(R n+1 ‑R n ) / R n ; When the real-time detection result of the oil smoke escape volume A meets the following conditions: (A n+1 ‑A n ) / A n ≤‑10%, the rate of change of the motor speed R is y, which satisfies the following relationship: (R n+1 ‑R n ) / R n =y; When the real-time detection result of the oil smoke escape volume A meets the following conditions: -10%<(A n+1 ‑A n ) / A n <10%, the control module controls the motor speed R to remain unchanged. The technical solution provided by the present invention has the following advantages: the motor speed can be flexibly adjusted to avoid fan overload, the motor speed has a large range of variation, the product is smarter and more energy-saving, it is more sensitive to the change in the amount of oil smoke, and smoke can be exhausted in a targeted manner, which is in line with the actual cooking situation and has a more ideal exhaust effect.

Description

Technical Field

[0001] The present invention relates to the field of motor control of smoking equipment, and in particular to a method for controlling the motor speed of smoking equipment by the amount of oil smoke escape and the smoking equipment. Background Art

[0002] At present, most of the kitchen smoking equipment on the market, such as range hoods or integrated stoves, use variable frequency motors to drive the fan blades to rotate so as to discharge the oil smoke generated during cooking to the outside. However, existing products basically use constant power, constant air volume or a combination of the two to control the speed of the motor. The basic principle is: for example, when the smoke inlet of the smoking device is blocked, the output power and output air volume of the motor will be reduced, and the controller MCU will increase the speed of the motor by increasing the current and voltage to ensure constant output power or output air volume. This control method has a major defect, that is, no matter how much oil smoke is generated in the kitchen, as long as the smoke inlet is blocked, the controller will issue a current and voltage increase instruction. When there is not much kitchen oil smoke, it is easy to cause energy waste, and when there is too much kitchen oil smoke, it may not necessarily increase the output power and output air volume of the motor. For example, a similar scheme is disclosed in a Chinese invention application with application publication number CN112833438A, entitled A method and device for controlling constant air volume of a range hood: A method for controlling constant air volume of a range hood, comprising: after the range hood obtains a constant air volume control instruction, collecting initial operating parameters of the range hood, wherein the initial operating parameters include the current speed of the range hood motor, the current back pressure of the common flue and the current outlet static pressure of the range hood duct; based on the initial operating parameters, calculating current operating parameters, wherein the current operating parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct; if the current air volume of the range hood is different from the target air volume, calculating the target speed of the range hood motor based on the current operating parameters; controlling the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

[0003] In response to this major defect, many manufacturers of smoking equipment have developed the following improved products in order to overcome the problem that the actual exhaust volume of the smoking equipment deviates from the preset value due to blockage or damage of the ventilation duct, or due to differences in floors and public flues, resulting in poor exhaust effect. For example, the Chinese invention application entitled Control Method for Range Hood and Range Hood with the authorization announcement number CN109114608B discloses: A control method for a range hood, wherein the range hood includes a controller, a sensor and a fan connected to the controller, the controller obtains the current air volume, and when the current air volume does not reach the default air volume of the fan corresponding to the gear, the controller adjusts the air volume control parameter and sends the adjusted air volume control parameter to the sensor; the sensor obtains the expected fan speed according to the adjusted air volume control parameter and the current oil smoke concentration measured by the sensor, and when the expected fan speed does not meet the current fan speed, the expected fan speed is sent to the controller; the controller adjusts the running gear of the fan according to the expected fan speed. Before the controller adjusts the air volume control parameters, it also includes: obtaining an air volume deviation coefficient according to the current air volume and the default air volume of the current fan gear. The controller calculates the air volume deviation coefficient according to the following formula, that is, air volume deviation coefficient i = [air volume (default, i) - air volume (current, i)] / air volume max, where i represents the gear of the fan, and air volume max is the preset maximum output air volume of the range hood. The technical solution described in this invention patent has the following shortcomings: first, it is necessary to monitor the air volume. Although this operation overcomes the interference caused by, for example, the smoke inlet is blocked, the adjustment of the air volume needs to be compared with the default air volume of the corresponding gear. In fact, it is impossible to flexibly adjust the motor speed according to the amount of oil smoke, or the range of adjustable speed is very limited.

[0004] For another example, a control method for a range hood, the range hood includes a gas sensor placed in a smoke collecting chamber, a controller electrically connected to the gas sensor, and a fan electrically connected to the controller, the gas sensor is used to detect alcohol, coal gas, and organic vapor in the air, and sends the collected information to the controller, the control method includes the following steps:

[0005] (1) Set the first stable value of the air environment detected by the gas sensor after the initial power-on as the operating reference value a, the maximum threshold value of the gas sensor is Ma, and the minimum threshold value of the gas sensor is ma, where Ma = a+c, ma = a+d, c>d; (2) The gas sensor detects the air environment in the smoke collecting chamber in real time, and sends the detected real-time value b to the controller. When the change of b within the time t1 is Δb>s, the controller issues a command to start the fan; (3) When b≥Ma, execute step (i); when Ma>b>ma, execute step (ii); when b≤ma, execute step (iii); (i) The controller issues a command to increase the speed of the fan; (ii) The controller issues a command to reduce the speed of the fan. After the fan reduces the speed, the controller stops issuing commands within t2; (iii) The controller issues a command to stop the fan. After the fan stops working, the controller stops issuing commands within t2. The technical solution described in this invention patent has the following deficiencies: the start-up of the fan is controlled according to the change in b within the time t1, that is, even when the fan is not working, the gas sensor needs to continue to work for monitoring, resulting in a long service life of the sensor and a reduced lifespan; mainly, the invention uses the threshold of the gas sensor as the judgment standard for speeding up, slowing down and stopping the fan. For example, even if the amount of oil smoke has been greatly reduced, as long as it exceeds the range of Ma, the fan speed needs to be continuously increased. This is obviously prone to the situation where the amount of oil smoke is significantly reduced but the fan is still running at high speed. Before reaching the range of Ma>b>ma, the fan is prone to operating overload, which has an adverse effect on the fan.

[0006] For another example, the Chinese invention application with application publication number CN105650818A, entitled A method for purifying a kitchen environment, related devices and systems, discloses: including: detecting the current air quality of the kitchen; determining whether an air purification operation is required based on the air purification parameter value pre-set by the mobile terminal and the current air quality detection result; when it is determined that an air purification operation is required, issuing a first control instruction to the fan of the range hood to control the fan to rotate at a preset speed. Determining whether an air purification operation is required based on the air purification parameter value pre-set by the mobile terminal and the current air quality detection result includes: obtaining the detection parameter value obtained by detecting the current air quality; comparing the pre-set air purification parameter value with the detection parameter value; when the absolute value of the difference between the two is greater than or equal to a preset threshold, determining that an air purification operation is required. According to the absolute value of the difference between the detection parameter value and the air purification parameter value, one is selected from a plurality of preset speeds as the speed of the fan; the plurality of preset speeds are different in size and correspond to a preset absolute value range respectively; the preset speed is positively correlated with the absolute value; the determined speed of the fan is carried in the control instruction and sent to the fan. When the absolute value of the difference between the two is less than the preset threshold value, a second control instruction is issued to the fan of the range hood to control the fan to stop working. Even if the preset speed is positively correlated with the absolute value, the technical solution of the invention application is essentially to compare the current air parameter with the preset value and select the preset fan speed through the comparison result. The wind speed with a large absolute value is large and the wind speed with a small absolute value is small. However, the technical solution of the invention application does not intelligently adjust the fan speed according to the change in the amount of oil smoke within the same threshold range. Therefore, it is easy to appear that even if the amount of oil smoke changes greatly (for example, it decreases rapidly), the fan speed still maintains the set speed because the oil smoke difference is still at the same threshold value. The resulting problem is also similar to the above technical solution. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a control method that can adjust the motor speed according to the rate of change of the amount of oil smoke. The motor speed can be flexibly adjusted to avoid fan overload. The motor speed has a large range of change, the product is smarter and more energy-saving, and is more sensitive to the change in the amount of oil smoke. It can exhaust smoke in a targeted manner, and is more in line with actual cooking conditions, with a more ideal exhaust effect.

[0008] The present invention mainly adopts the following technical solutions:

[0009] A method for controlling the motor speed of a smoking device by the amount of oil smoke escaping, the smoking device is provided with a smoke inlet, and a negative pressure area is formed at the smoke inlet by driving a fan blade to rotate through the operation of a motor, the smoking device is further provided with a control module and a sensor detection module, the control module is connected to the motor and the sensor detection module respectively, the sensor detection module is used to detect the amount of oil smoke escaping outside the negative pressure area in real time and feed back the real-time detection result to the control module at intervals of a period of time T, the control module controls the motor speed R according to the real-time detection result of the oil smoke escaping amount A fed back by the sensor detection module, and sets the oil smoke escaping amount pre-detected by the sensor detection module as A n , at this time the motor speed is set to R n , the amount of oil smoke escape detected by the sensor detection module after a period of time T is set as A n+1 , at this time the motor speed is set to R n+1 , where n is an integer greater than or equal to 0, when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the motor speed R to increase, and the change rate of the motor speed R and the change rate of the oil smoke escape amount A meet the following relationship: x(A n+1 -A n ) / A n =(R n+1 -R n ) / R n , where x is any value between 0.5 and 1.5; when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the motor speed R to decrease, and the rate of change of the motor speed R is y, where y is any value between -0.2 and -0.05, that is, it meets the following relationship: (R n+1 -R n ) / R n =y; when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: -10%<(A n+1 -A n ) / A n <10%, the control module controls the speed R of the motor to remain unchanged.

[0010] The motor is set to have a minimum speed R min and maximum speed R max , when the motor speed R runs to R max / [1+x(A n+1 -A n ) / A n ]<R≤R max Even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the speed R of the motor to remain unchanged to prevent the speed R of the motor from exceeding the minimum speed R max ; When the motor speed R runs to R min ≤R<R min / 1+y, even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the speed R of the motor to remain unchanged to prevent the speed R of the motor from exceeding the minimum speed R min .

[0011] Among them, the minimum speed R of the motor min =800r / min, the maximum speed of the motor R max =1500r / min.

[0012] The time period T is divided into m segments, each segment is t, that is, m*t=T, where m is an integer greater than or equal to 1, and the oil smoke escape amount A n+1 The value of is the amount of oil smoke A detected by the sensor detection module n Starting from the moment t, the average value of the real-time detection result of the oil smoke escape amount A detected by the sensor detection module at intervals of time t, that is, A n+1 =(A t +A 2t +A 3t +A 4t +……+ A mt ) / m.

[0013] The time period T ranges from 30s to 300s.

[0014] The motor is linked to the ignition of the stove core. When the stove core is ignited, the control module controls the motor to start running at an initial speed R0, where R0 = R minAt this time, the oil smoke escape amount A detected by the sensor detection module is the initial oil smoke escape amount A0. When the time interval from the last time the motor stopped running when the stove core was ignited is less than 2h, the control module uses the oil smoke escape amount A'0 detected by the sensor detection module when the stove core was last ignited as the initial oil smoke escape amount A0, that is, A0=A'0. When the time interval from the last time the motor stopped running when the stove core was ignited is greater than or equal to 2h, the oil smoke escape amount A detected by the sensor detection module adopts the initial oil smoke escape amount A0.

[0015] Among them, the sensor detection module includes an infrared transmitter and a light receiver. The infrared transmitter and the light receiver are set to intersect with each other's optical axes. When the oil smoke escaping outside the negative pressure area passes through the area where the optical axes intersect with each other, the oil smoke particles will reflect the infrared rays. The light receiver receives the infrared rays reflected by the oil smoke particles and judges the amount of oil smoke according to the intensity of the light.

[0016] Wherein, the housing of the smoking device forms a smoke collecting chamber, the smoke inlet is located at one side of the smoke collecting chamber, and the sensor detection module is arranged on the housing outside the smoke collecting chamber.

[0017] Wherein, the sensor detection module is arranged on the front side of the smoking device.

[0018] A smoking device adopts the above method of controlling the speed of the motor of the smoking device by the amount of oil smoke escaping.

[0019] According to the technical solution of the present invention, the following beneficial effects are achieved: the motor speed is intelligently adjusted by monitoring the rate of change of the amount of oil smoke, and when the rate of change of the amount of oil smoke is large, the motor quickly adjusts the rate of change to follow the rate of change of the amount of oil smoke, and the motor speed change rate curve is consistent or substantially consistent with the rate of change of the amount of oil smoke, so that there will be no phenomenon such as the amount of oil smoke increasing slightly but the motor speed keeps increasing, thus avoiding motor overload. The technical solution of the present application fully realizes targeted exhaust, the product is more intelligent and more energy-saving, and there will be no excessive motor load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the connection between the control module of this application and the motor and sensor detection module.

[0021] Figure 2 This is a logic diagram of the method for controlling the motor speed of a smoking device by the amount of oil smoke escape in this application.

[0022] Figure 3 This is the logic judgment diagram for the value of A0 in this application.

[0023] Figure 4 This is a structural block diagram of the sensor detection module in this application.

[0024] Figure 5 This is a schematic diagram of the installation position structure of the sensor detection module S in this application. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0026] See also Figure 1 , 2 As shown, a method for controlling the motor speed of a smoking device by the amount of oil smoke escaping is provided. The smoking device is provided with a smoke inlet, and a negative pressure area is formed at the smoke inlet by driving the fan blades to rotate by the operation of the motor. The smoking device is also provided with a control module and a sensor detection module. The control module is connected to the motor and the sensor detection module respectively. The sensor detection module is used to detect the amount of oil smoke escaping outside the negative pressure area in real time and feed back the real-time detection result to the control module at intervals of a period of time T. The control module controls the motor speed R according to the real-time detection result of the oil smoke escaping amount A fed back by the sensor detection module, and sets the oil smoke escaping amount pre-detected by the sensor detection module to A. n , at this time the motor speed is set to R n , the amount of oil smoke escape detected by the sensor detection module after a period of time T is set to A n+1 , at this time the motor speed is set to R n+1 , where n is an integer greater than or equal to 0, when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the motor speed R to increase, and the change rate of the motor speed R and the change rate of the oil smoke escape volume A meet the following relationship: x(A n+1 -A n ) / A n =(R n+1 -R n ) / R n , where x is any value between 0.5 and 1.5; when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the motor speed R to decrease, and the rate of change of the motor speed R is y, where y is any value between -0.2 and -0.05, that is, it meets the following relationship: (R n+1 -R n ) / R n=y; when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: -10%<(A n+1 -A n ) / A n <10%, the control module controls the motor speed R to remain unchanged. Preferably, the value of x is 1. Preferably, the value of y is 0.1. The technical solution of the present invention controls the motor speed by detecting the rate of change of the amount of oil smoke escaping, so that the motor speed change rate curve is consistent or substantially consistent with the oil smoke escaping amount change rate curve, and there will be no phenomenon such as the oil smoke amount increment is not large but the motor speed keeps increasing, thereby avoiding motor overload. Moreover, in this application (A n+1 -A n ) / A n When the motor speed is ≥10%, the change rate of the motor speed and the change rate of the oil smoke escape volume conform to the formula: x(A n+1 -A n ) / A n =(R n+1 -R n ) / R n , which is conducive to quickly and purposefully discharging the oil smoke that suddenly rises during cooking, and avoids the phenomenon that the oil smoke first escapes into the surrounding environment in a large area and then is quickly discharged by the motor-driven fan blades, that is, there will be no "surge" of oil smoke smell, and the oil smoke can be contained before the diffusion stage, avoiding the situation that the kitchen air is "polluted first and then treated", which plays a good protective role on the user's respiratory system; in this application (A n+1 -A n ) / A n When the motor speed is ≤-10%, the rate of change of the motor speed is y, which takes into account the actual situation that the smoking device is at a distance from the oil fume source in the pot, so as to avoid the problem that the oil fume drop rate detected at the location of the sensor detection module is high due to the rapid operation of the motor, but the oil fume in the pot has not risen for a distance, thereby reducing the exhaust effect. In this case, preferably, the motor speed is maintained unchanged for at least 180s, and more preferably, the value of the period of time T is 180s. More importantly, the technical solution of the present invention can significantly reduce the excessive energy consumption generated by the motor, and the exhaust is more power-saving and intelligent. In addition, the inventor of the present application has studied for many years and combined with practical experience, and set the change rate node to y is the most reasonable choice to balance the exhaust effect and the performance of the motor itself.

[0027] See also Figure 2 As shown, the motor is set to have a minimum speed R min and maximum speed R max , when the motor speed R runs to R max / [1+x(A n+1 -A n ) / A n]<R≤R max Even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the motor speed R to remain unchanged to prevent the motor speed R from exceeding the minimum speed R max ; When the motor speed R reaches R min ≤R<R min / 1+y, even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the motor speed R to remain unchanged to prevent the motor speed R from exceeding the minimum speed R min In this application, the upper and lower limits of the motor speed are set. On the one hand, it can effectively ensure that the motor speed meets the national noise standard range and will not cause obvious noise pollution to users. On the other hand, it can also achieve the purpose of exhausting oil smoke within the most reasonable speed range, and obviously limit the energy consumption within a controllable range.

[0028] See also Figure 2 As shown, the minimum speed of the motor R min =800r / min, the maximum speed of the motor R max =1500r / min.

[0029] See also Figure 3 As shown, a period of time T is divided into m segments, each of which lasts for t, that is, m*t=T, where m is an integer greater than or equal to 1, and the amount of oil smoke A n+1 The value is the amount of oil smoke A detected by the sensor detection module n Starting from the moment t, the average value of the real-time detection result of the oil smoke escape volume A detected by the sensor detection module at intervals of time t, that is, A n+1 =(A t +A 2t +A 3t +A 4t +……+A mt ) / m. The present application adopts the above technical solution, which mainly avoids the problem of "floating" data of the sensor detection module caused by uneven oil fume particles. For example, when a large oil fume particle appears and is detected by chance, it will cause the instantaneous data to be very large. This will cause the data to be unstable due to the uneven oil fume particles, which can easily cause the control module to make a misjudgment. Therefore, taking the average of multiple data within the T time period can better fit the real oil fume environment in the kitchen. Preferably, the value of t is 0.5s.

[0030] Further, the time period T is in the range of 30s to 300s. More preferably, the value of T is 30s, 180s, etc.

[0031] See also Figure 3 As shown, the motor is linked to the stove core ignition. When the stove core is ignited, the control module controls the motor to start running at an initial speed R0, where R0 = R min At this time, the oil fume escape amount A detected by the sensor detection module is the initial oil fume escape amount A0. When the time interval from the last time the motor stopped running when the stove core was ignited is less than 2h, the control module uses the oil fume escape amount A'0 detected by the sensor detection module when the stove core was last ignited as the initial oil fume escape amount A0, that is, A0=A'0. When the time interval from the last time the motor stopped running when the stove core was ignited is greater than or equal to 2h, the oil fume escape amount A detected by the sensor detection module adopts the initial oil fume escape amount A0. The present application adopts the aforementioned technical solution mainly to avoid the situation where there are more residual oil fume particles due to the short time since the last cooking (less than 2 hours), and the situation where the amount of oil fume is large but the rate of change is not large when cooking again. The present application defines 2 hours as the node, which is based on the ventilation time required for the kitchen space, the rotation power of the motor to drive the fan blades, and combined with actual experience. In addition, the aforementioned technical solution of the present application also takes into account the situation where the time since the last cooking is short (less than 2 hours), there will be oil fume backflow, resulting in more residual oil fume particles, and the situation where the amount of oil fume is large but the rate of change is not large when cooking again.

[0032] See also Figure 4 As shown, the sensor detection module includes an infrared transmitter and a light receiver, and the infrared transmitter and the light receiver are arranged so that the optical axes intersect. When the oil smoke escaping outside the negative pressure area passes through the area where the optical axes intersect each other, the oil smoke particles will reflect the infrared light, and the light receiver receives the infrared light reflected by the oil smoke particles and determines the amount of oil smoke according to the light intensity. Preferably, the light receiver also includes a signal amplifier.

[0033] See also Figure 5 As shown, a smoke collecting chamber is formed on the shell of the smoking device, a smoke inlet is located at one side of the smoke collecting chamber, and a sensor detection module is arranged on the shell outside the smoke collecting chamber.

[0034] See also Figure 5 As shown, the sensor detection module is arranged on the front side of the smoking device. In some embodiments, the sensor detection module can also be arranged on the left side and / or the right side of the smoking device.

[0035] A smoking device adopts the above method of controlling the speed of the motor of the smoking device by the amount of oil smoke escaping.

[0036] Although the specific embodiments of the present invention have been described above, those skilled in the art may modify them without departing from the spirit and principles of the present invention. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A method for controlling the motor speed of a smoking device by the amount of oil smoke escaping, wherein the smoking device is provided with a smoke inlet, and a negative pressure zone is formed at the smoke inlet by driving the fan blades to rotate by the operation of the motor, and the smoking device is further provided with a control module and a sensor detection module, wherein the control module is connected to the motor and the sensor detection module respectively, and the sensor detection module is used to detect the amount of oil smoke escaping outside the negative pressure zone in real time and feed back the real-time detection result to the control module at intervals of a period of time T, and the control module controls the motor speed R according to the real-time detection result of the oil smoke escaping amount A fed back by the sensor detection module, characterized in that: The amount of oil smoke escape pre-detected by the sensor detection module is set as A n , at this time the motor speed is set to R n , the amount of oil smoke escape detected by the sensor detection module after a period of time T is set as A n+1 , at this time the motor speed is set to R n+1 , where n is an integer greater than or equal to 0, when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the motor speed R to increase, and the change rate of the motor speed R and the change rate of the oil smoke escape amount A meet the following relationship: x(A n+1 -A n ) / A n =(R n+1 -R n ) / R n , where x is any value between 0.5 and 1.5; when the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the motor speed R to decrease, and the rate of change of the motor speed R is y, where y is any value between -0.2 and -0.05, that is, it meets the following relationship: (R n+1 -R n ) / R n =y; When the above-mentioned real-time detection result of the oil smoke escape volume A meets the following conditions: -10%<(A n+1 -A n ) / A n <10%, the control module controls the motor speed R to remain unchanged; the motor is linked to the stove core ignition, and when the stove core is ignited, the control module controls the motor to start running at an initial speed R0, where R0 = R min At this time, the oil fume escape amount A detected by the sensor detection module is the initial oil fume escape amount A0. When the time interval from the last time the motor stopped running when the stove core was ignited is less than 2h, the control module uses the oil fume escape amount A'0 detected by the sensor detection module when the stove core was last ignited as the initial oil fume escape amount A0, that is, A0=A'0. When the time interval from the last time the motor stopped running when the stove core was ignited is greater than or equal to 2h, the oil fume escape amount A detected by the sensor detection module adopts the initial oil fume escape amount A0.

2. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 1, characterized in that: The motor is set to have a minimum speed R min and maximum speed R max , when the motor speed R runs to R max / [1+x(A n+1 -A n ) / A n ]<R≤R max Even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≥10%, the control module controls the speed R of the motor to remain unchanged to prevent the speed R of the motor from exceeding the maximum speed R max ; When the motor speed R runs to R min ≤R<R min / (1+y), even if the above-mentioned real-time detection result of the oil smoke escape amount A meets the following conditions: (A n+1 -A n ) / A n ≤-10%, the control module controls the speed R of the motor to remain unchanged to prevent the speed R of the motor from exceeding the minimum speed R min .

3. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 2 is characterized in that: The minimum speed R of the motor min =800r / min, the maximum speed of the motor R max =1500r / min.

4. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to any one of claims 1 to 3, characterized in that: The time period T is divided into m segments, each segment is t, that is, m*t=T, where m is an integer greater than or equal to 1, and the oil smoke escape amount A n+1 The value of is the amount of oil smoke A detected by the sensor detection module n Starting from the moment t, the average value of the real-time detection result of the oil smoke escape amount A detected by the sensor detection module at intervals of time t, that is, A n+1 =(A t + A 2t + A 3t + A 4t +……+ A mt ) / m.

5. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 1, characterized in that: The time period T ranges from 30s to 300s.

6. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 1, characterized in that: The sensor detection module includes an infrared transmitter and a light receiver. The infrared transmitter and the light receiver are arranged so that their optical axes intersect. When the oil smoke escaping outside the negative pressure area passes through the area where the optical axes intersect each other, the oil smoke particles will reflect the infrared rays. The light receiver receives the infrared rays reflected by the oil smoke particles and determines the amount of oil smoke according to the intensity of the light.

7. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 6, characterized in that: The housing of the smoking device is formed with a smoke collecting chamber, the smoke inlet is located at one side of the smoke collecting chamber, and the sensor detection module is arranged on the housing outside the smoke collecting chamber.

8. The method for controlling the motor speed of a smoking device by the amount of oil smoke escaping according to claim 7, characterized in that: The sensor detection module is arranged at the front side of the smoking device.

9. A smoking device, characterized in that: A method for controlling the motor speed of a smoking device by the amount of oil smoke escaping as described in any one of claims 1 to 8.

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