Intelligent range hood

Abstract

A smart range hood includes an exhaust fan, a motor, a control unit, a timing unit, and a human body sensor. The exhaust fan is used to exhaust kitchen exhaust gas or fumes. The motor is coupled to the exhaust fan. The control unit is coupled to the motor. The timing unit is coupled to the control unit for timing. The human body sensor is coupled to the control unit for sensing the movement of a human body. When the human body sensor detects the movement of a human body, the human body sensor generates a signal, and the control unit controls the motor to drive the exhaust fan to exhaust kitchen exhaust gas or fumes based on the signal. When the human body sensor does not generate the signal, the control unit controls the timing unit to start timing, and controls the motor to stop driving the exhaust fan when the timing unit finishes timing.

Description

Technical Field

[0001] This invention relates to a range hood, and more particularly to an intelligent range hood that can automatically control the start / stop of the exhaust fan and the exhaust power according to changes in smoke concentration and temperature. Prior Technology

[0002] Range hoods are indispensable equipment in modern kitchens. Their main function is to absorb and expel cooking fumes generated during cooking, thereby reducing indoor air pollution. However, most range hoods can only be started or have their fan speed adjusted manually. This manual operation can easily lead to the accumulation of fumes, affecting indoor air quality and environmental hygiene, and may even harm the respiratory system of family members. To improve fume extraction efficiency and reduce the impact on human health, engineers have successively developed various sensing and automatic start technologies to enhance fume extraction performance and ease of use.

[0003] Currently known technologies include infrared temperature sensors or flame sensors for detection in some range hoods. However, infrared temperature sensing technology is easily interfered with by the human body or surrounding heat sources, which may lead to false alarms. If the sensitivity is lowered to reduce the false alarm rate, it may not be able to accurately detect the stove flame temperature, affecting the smoke extraction effect and causing inconvenience. Flame sensors typically use ultraviolet lamps as sensing elements, with a sensing range of approximately 250~400 nm. However, sunlight also radiates long-wave ultraviolet (315~400 nm) and medium-wave ultraviolet (280~315 nm) ultraviolet rays. Under sunlight, ultraviolet sensors may be interfered with, causing the range hood to malfunction. This may cause additional inconvenience in kitchens with abundant daylight. Summary of the Invention

[0004] This invention provides an intelligent range hood that can automatically control the fan speed according to changes in smoke concentration and temperature, in order to solve the above-mentioned problems.

[0005] According to one embodiment, the present invention discloses an intelligent range hood, comprising an exhaust fan, a motor, a control unit, a timing unit, and a human body sensor. The exhaust fan is used to exhaust exhaust gas or cooking fumes from a kitchen. The motor is coupled to the exhaust fan. The control unit is coupled to the motor. The timing unit is coupled to the control unit for timing. The human body sensor is coupled to the control unit for sensing the movement of a human body. When the human body sensor detects the movement of the human body, the human body sensor generates a signal, and the control unit controls the motor to drive the exhaust fan to exhaust the exhaust gas or cooking fumes from the kitchen based on the signal. When the human body sensor does not generate the signal, the control unit controls the timing unit to start timing, and controls the motor to stop driving the exhaust fan to exhaust the exhaust gas or cooking fumes from the kitchen when the timing unit finishes timing.

[0006] According to one embodiment, the intelligent range hood further includes a first temperature sensor, a second temperature sensor, a smoke sensor, and a light source element. The first temperature sensor is coupled to the control unit to sense the temperature of the exhaust gas or the cooking fumes. The second temperature sensor is coupled to the control unit to sense an ambient temperature. The smoke sensor is coupled to the control unit to sense the smoke level of the exhaust gas or the cooking fumes. The light source element is coupled to the control unit to display the operating status of the intelligent range hood. The control unit controls the light source element to display different light signals and controls the motor to drive the exhaust fan to exhaust the exhaust gas or cooking fumes from the kitchen at different power levels, based on the smoke level of the exhaust gas or cooking fumes sensed by the smoke sensor, or the temperature difference between the temperature of the exhaust gas or cooking fumes sensed by the first temperature sensor and the ambient temperature sensed by the second temperature sensor.

[0007] According to one embodiment, the first temperature sensor is disposed on a panel of the smart range hood, and the second temperature sensor and the smoke sensor are disposed in an air duct of the smart range hood.

[0008] According to one embodiment, when the control unit determines that the smoke value is less than a first predetermined smoke value or the temperature difference is less than a first predetermined temperature difference, the control unit controls the light source element to display a first gear indicator and controls the motor to drive the exhaust fan to discharge the exhaust gas or oil fumes from the kitchen at a first exhaust power.

[0009] According to one embodiment, when the control unit determines that the smoke value is greater than the first predetermined smoke value and less than the second predetermined smoke value, or the temperature difference is greater than the first predetermined temperature difference and less than the second predetermined temperature difference, the control unit controls the light source element to display a second-level light signal, and controls the motor to drive the exhaust fan to exhaust the exhaust gas or oil fumes from the kitchen at a second exhaust power, wherein the second predetermined temperature difference is greater than the first predetermined temperature difference, the second predetermined smoke value is greater than the first predetermined smoke value, and the second exhaust power is greater than the first exhaust power.

[0010] According to one embodiment, when the control unit determines that the smoke value is greater than the second predetermined smoke value or the temperature difference is greater than the second predetermined temperature difference, the control unit controls the light source element to display a third level light, and controls the motor to drive the exhaust fan to exhaust the exhaust gas or oil fumes from the kitchen at a third exhaust power, wherein the third exhaust power is greater than the second exhaust power.

[0011] According to one embodiment, the first exhaust power is 8 cubic meters per minute, the second exhaust power is 14 cubic meters per minute, and the third exhaust power is 18.5 cubic meters per minute.

[0012] According to one embodiment, the time interval between the start and end of the timing unit is 5 minutes.

[0013] According to one embodiment, the human body sensor is a proximity sensor.

[0014] In summary, the intelligent range hood of this invention integrates a human body sensor, a temperature sensor, a smoke sensor, and a control unit. It can automatically adjust the operation of the exhaust fan based on smoke concentration, temperature changes, and human activity, thereby improving smoke extraction efficiency. This invention employs a multi-level control mechanism, adjusting the fan speed according to different smoke levels and temperature differences to adapt to the needs of different cooking environments. Furthermore, the operating status is displayed via an indicator light, allowing users to intuitively understand the device's operation. A timing unit ensures that the intelligent range hood shuts off appropriately when there is no human activity, avoiding unnecessary operation. This invention overcomes the malfunctions caused by insufficient sensor sensitivity or environmental influences in existing technologies, providing a more intelligent and reliable smoke extraction solution.

[0015] The foregoing descriptions and other technical contents, features and effects of this invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. Simple Explanation of the Diagram

[0016] Figure 1 is a schematic diagram of the intelligent range hood according to an embodiment of the present invention. Figure 2A is a flowchart of the upper part of the intelligent range hood according to an embodiment of the present invention. Figure 2B is a flowchart of the lower half of the intelligent range hood according to an embodiment of the present invention. Figure 3 is a functional block diagram of the intelligent range hood according to an embodiment of the present invention. Figure 4 is a diagram showing the relationship between the exhaust power, temperature difference, and smoke level of the intelligent range hood according to an embodiment of the present invention. Implementation

[0017] To enable those skilled in the art to further understand the present invention, preferred embodiments of the present invention are described below, along with a detailed description of the invention's structure and desired effects in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are simplified schematic diagrams; therefore, only elements and combinations related to the present invention are shown to provide a clearer description of the basic structure or implementation method of the present invention, while the actual elements and layout may be more complex. Furthermore, for ease of explanation, the components shown in the various drawings of the present invention are not drawn to scale according to the actual number, shape, and size; the detailed scale can be adjusted according to design requirements.

[0018] The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0019] Although the terms "first," "second," "third," etc., can be used to describe multiple components, the components are not limited to these terms. These terms are used only to distinguish a single component from other components in the specification. The same terms may not be used in the same request, and the components may be designated as "first," "second," "third," etc., in the order they are declared in the request. Therefore, in the following specification, "first component" may be "second component" in the request.

[0020] Please refer to Figures 1, 3, and 4. Figure 1 is a schematic diagram of the intelligent range hood 1000 according to an embodiment of the present invention. Figure 3 is a functional block diagram of the intelligent range hood 1000 according to an embodiment of the present invention. Figure 4 is a graph showing the relationship between the exhaust power, temperature difference, and smoke level of the intelligent range hood 1000 according to an embodiment of the present invention. The intelligent range hood 1000 includes an exhaust fan 1, a motor 2, a control unit 3, a timing unit 4, a human body sensor 5, a first temperature sensor 6, a second temperature sensor 7, a light source element 8, and a smoke sensor 9. The control unit 3 acts as the central hub of the system, coupled to and controlling each component (including the motor 2, the timing unit 4, the human body sensor 5, the first temperature sensor 6, the second temperature sensor 7, the light source element 8, and the smoke sensor 9). Based on the data collected by each component, the control unit 3 controls the motor 2 to drive the exhaust fan 1 to run or stop the exhaust fan 1, or controls the motor 2 to drive the exhaust fan 1 to exhaust kitchen exhaust gas or fumes at different power levels.

[0021] When the human body sensor 5 detects human movement, it generates a signal and transmits it to the control unit 3. The control unit 3 then controls the motor 2 to drive the exhaust fan 1 to expel kitchen fumes or oil fumes based on the signal. Preferably, the human body sensor 5 can be a proximity sensor. In this embodiment, for example, the human body sensor 5 can be a microwave sensor, a passive infrared sensor (PIR sensor), an ultrasonic sensor, or other similar elements or combinations thereof. The invention is not limited to these, and the choice depends on the specific needs.

[0022] Smoke sensor 9 and first temperature sensor 6 are installed in the air duct 11 of the smart range hood 1000, and are used to detect the smoke value and temperature of exhaust gas or fumes, respectively. Second temperature sensor 7 is installed on the panel 10 of the smart range hood 1000 to detect the ambient temperature of the kitchen. Control unit 3 can obtain the temperature difference between the exhaust gas or fumes temperature and the ambient temperature based on the temperature of the exhaust gas or fumes detected by first temperature sensor 6 and the ambient temperature detected by second temperature sensor 7. Control unit 3 controls the light source element 8 to display different light signals based on the temperature difference and smoke value, and adjusts the power of motor 2 to make the exhaust fan 1 run at an appropriate wind speed to ensure that exhaust gas or fumes can be quickly discharged.

[0023] The light source element 8 can remind the user of the current smoke extraction status through different light levels. When the first light level 81 is lit, it indicates that the control unit 3 determines that the smoke value is less than the first predetermined smoke value or the aforementioned temperature difference is less than the first temperature difference. At this time, the intelligent range hood 1000 is in the first exhaust power operation mode, that is, the control unit 3 controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the first exhaust power. When the second light level 82 is lit, it indicates that the control unit 3 determines that the smoke value is greater than the first predetermined smoke value and less than the second predetermined smoke value or the aforementioned temperature difference is greater than the first predetermined temperature difference. When the temperature difference is less than the second predetermined temperature difference, the intelligent range hood 1000 automatically adjusts to the second exhaust power operating mode, that is, the control unit 3 controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the second exhaust power; when the third gear indicator 83 is lit, it indicates that the control unit 3 judges that the smoke value is greater than the second predicted smoke value or the aforementioned temperature difference is greater than the second predetermined temperature difference, and the intelligent range hood 1000 automatically adjusts to the third exhaust power operating mode, that is, the control unit 3 controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the third exhaust power. Wherein, the second predetermined smoke value is greater than the first predetermined smoke value, the second predetermined temperature difference is greater than the first predetermined temperature difference, the third exhaust power is greater than the second exhaust power, and the second exhaust power is greater than the first exhaust power. In this embodiment, for example, the first exhaust power can be 8 cubic meters / minute, the second exhaust power can be 14 cubic meters / minute, and the third exhaust power can be 18.5 cubic meters / minute, but the present invention is not limited to the above values, and the specific values ​​depend on actual needs.

[0024] Furthermore, in this embodiment, for example, the light source element 8 can be a light-emitting diode (LED), a light-emitting diode display (LED Display), a seven-segment display, a liquid crystal display (LCD), or other similar elements or combinations of any of the above elements. The present invention is not limited to this and depends on the actual needs.

[0025] Understandably, the first gear indicator 81, the second gear indicator 82, and the third gear indicator 83 may be distinguished by different colors, positions, and / or patterns.

[0026] On the other hand, when the human body sensor 5 does not detect human activity, the control unit 3 can control the motor 2 to continuously drive the exhaust fan 1 and start the timing unit 4 to ensure that residual exhaust gas or fumes in the kitchen can be fully discharged. In this embodiment, for example, the time interval between the start and end of the timing unit 4 can be 5 minutes. During this period, the exhaust fan 1 can continuously operate at a first, second, or third exhaust power according to the smoke level or temperature difference, so that the kitchen space can be circulated at least once, thereby ensuring the air quality of the kitchen space. When the timing unit 4 finishes timing, the control unit 3 will issue a command to stop the motor 2 from driving the exhaust fan 1, to prevent the equipment from operating unnecessarily for a long time, further improve energy efficiency, reduce power consumption, and extend the service life of the intelligent range hood 1000. This automatic shutdown mechanism ensures that even if the user forgets to manually turn it off, the intelligent control system can still achieve energy saving and environmental protection effects.

[0027] Please refer to Figures 2A and 2B. Figure 2A is a flowchart of the upper half of the intelligent range hood according to an embodiment of the present invention, and Figure 2B is a flowchart of the lower half of the intelligent range hood according to an embodiment of the present invention. The process of the intelligent range hood 1000 of the present invention includes the following steps: Step S100: The human body sensor 5 detects the movement of the human body and generates a signal to the control unit 3; Step S101: The control unit 3 controls the light source element 8 to display the first gear indicator light 81, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the first exhaust power (8 cubic meters / minute); Step S102: The control unit 3 controls the first temperature sensor 6 and the second temperature sensor 7 to sense the temperature of the exhaust gas or oil fume and the ambient temperature respectively, and obtains the temperature difference based on the temperature of the exhaust gas or oil fume sensed by the first temperature sensor 6 and the ambient temperature sensed by the second temperature sensor 7. The control unit 3 also controls the smoke sensor 9 to sense the smoke value of the exhaust gas or oil fume. Step S103: Control unit 3 determines whether the smoke value is greater than a first predetermined smoke value and less than a second predetermined smoke value, or whether the temperature difference is greater than a first predetermined temperature difference and less than a second predetermined temperature difference; if yes, proceed to step S104; if no, proceed to step S101. Step S104: The control unit 3 controls the light source element 8 to display the second gear indicator 82, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the second exhaust power (14 cubic meters / minute); Step S105: Control unit 3 determines whether the smoke value is greater than the second predetermined smoke value or whether the temperature difference is greater than the second predetermined temperature difference; if yes, proceed to step S106; if no, proceed to step S103. Step S106: The control unit 3 controls the light source element 8 to display the third gear indicator light 83, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the third exhaust power (18.5 cubic meters / minute); Step S107: Control unit 3 determines whether human body sensor 5 continuously generates a signal; if yes, proceed to step 105; if no, proceed to step S108. Step S108: Control unit 3 controls timing unit 4 to start timing (5 minutes); Step S109: Control unit 3 determines whether timing unit 4 has finished timing; if yes, proceed to step S110; if no, proceed to step S109. Step S110: Control unit 3 controls motor 2 to stop driving exhaust fan 1 to expel kitchen exhaust gas or fumes.

[0028] The following is a detailed explanation. In steps S100 and S101, if the human body sensor 5 detects human movement, it can generate a signal to the control unit 3. After receiving the signal, the control unit 3 controls the light source element 8 to display the first level light 81, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the first exhaust power (8 cubic meters / minute). This design can prevent users from forgetting to turn on the smart range hood 1000 after entering the kitchen. By automatically detecting and starting the system, it can further improve the convenience of use, reduce the residue of fumes, and improve the air quality in the kitchen.

[0029] In step S102, the control unit 3 controls the first temperature sensor 6 and the second temperature sensor 7 to sense the temperature of the exhaust gas or fumes and the ambient temperature, respectively, and obtains the temperature difference based on the temperature of the exhaust gas or fumes sensed by the first temperature sensor 6 and the ambient temperature sensed by the second temperature sensor 7. In addition, the control unit 3 also controls the smoke sensor 9 to sense the smoke level of the exhaust gas or fumes. The control unit 3 controls the exhaust power of the intelligent range hood 1000 by using the temperature difference and smoke level to prevent a decline in kitchen air quality due to excessive smoke or high temperatures, and to ensure that the intelligent range hood 1000 operates at its optimal efficiency.

[0030] In step S103, if the control unit 3 determines that the smoke value is greater than the first predetermined smoke value and less than the second predetermined smoke value, or the temperature difference is greater than the first predetermined temperature difference and less than the second predetermined temperature difference, the control unit 3 may execute step S104, that is, the control unit 3 controls the light source element 8 to display the second gear light 82, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the second exhaust power (14 cubic meters / minute); if the control unit 3 determines that the smoke value is still less than the first predetermined smoke value or the temperature difference is still less than the first predetermined temperature difference, the control unit 3 executes step S101, that is, the control unit 3 controls the light source element 8 to display the first gear light 81, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the first exhaust power (8 cubic meters / minute).

[0031] In step S105, if the control unit 3 determines that the smoke value is greater than the second predetermined smoke value or the temperature difference is greater than the second predetermined temperature difference, the control unit 3 can execute step S106, that is, the control unit 3 can control the light source element 8 to display the third level light 83, and control the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the third exhaust power (18.5 cubic meters / minute); if the control unit 3 determines that the smoke value is not greater than the second predetermined smoke value and the temperature difference is not greater than the second predetermined temperature difference, the control unit 3 will execute step S103; if the control unit 3 determines that the smoke value is still greater than the first predetermined smoke value and less than the second predetermined smoke value or the temperature difference is still greater than the first predetermined smoke value and less than the second predetermined smoke value, the control unit 3 will execute step S103. If the temperature difference is greater than the first predetermined temperature difference but less than the second predetermined temperature difference, the control unit 3 executes step S104, that is, the control unit 3 controls the light source element 8 to display the second gear light 82, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the second exhaust power (14 cubic meters / minute). If the control unit 3 determines that the smoke value is not greater than the first predetermined smoke value and the temperature difference is not greater than the first predetermined temperature difference, the control unit 3 executes step S101, that is, the control unit 3 controls the light source element 8 to display the first gear light 81, and controls the motor 2 to drive the exhaust fan 1 to exhaust the kitchen exhaust gas or fumes at the first exhaust power (8 cubic meters / minute).

[0032] In step S107, if the control unit 3 determines that the human body sensor 5 is continuously generating a signal, the control unit 3 can execute step S105 to control the light source element 8 to display different light signals according to the temperature difference and smoke value, and adjust the power of the motor 2 so that the exhaust fan 1 continues to run at an appropriate wind speed; if the control unit 3 determines that the human body sensor 5 is not generating a signal (i.e., the human body sensor 5 is not detecting human activity), the control unit 3 executes step S108, that is, the control unit 3 controls the timing unit 4 to start timing (5 minutes) to continuously remove the remaining exhaust gas or fumes. In addition, in this embodiment, for example, the control unit 3 can execute step S107 after executing steps S101, S104 and S106, but the present invention is not limited to this, and it depends on the actual needs.

[0033] In step S109, if the control unit 3 determines that the timing unit 4 has finished timing, the control unit 3 can execute step S110, that is, the control unit 3 controls the motor 2 to stop driving the exhaust fan 1 to prevent the equipment from operating unnecessarily for a long time; if the timing has not finished, the control unit 3 executes step S109, that is, the control unit 3 can determine again whether the timing unit 4 has finished timing.

[0034] In summary, the intelligent range hood of this invention achieves more precise and automated smoke extraction control by integrating human body sensors, temperature sensors, and smoke sensors. The system automatically adjusts the fan speed based on changes in the kitchen environment, such as the concentration and temperature of smoke generated during cooking, ensuring that cooking fumes are effectively and promptly removed. Furthermore, to save energy, the system includes a timer function; when no one is detected in the kitchen, the exhaust fan automatically shuts off. Compared to traditional range hoods, this invention not only improves smoke extraction efficiency but also reduces the frequency of malfunctions, providing users with a more comfortable and safer kitchen environment.

[0035] The above description is only a preferred embodiment of the present invention. Any equivalent structural changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention.

[0036] 1000: Intelligent Range Hood 1: Exhaust fan 2: Motor 3: Control Unit 4: Timing Unit 5: Human body sensor 6: First temperature sensor 7: Second temperature sensor 8: Light source components 81: First gear indicator light 82: Second gear indicator light 83: Third gear indicator light 9: Smoke Detector 10: Panel 11: Air duct

Claims

1. A smart range hood, comprising: an exhaust fan for exhausting exhaust gas or cooking fumes from a kitchen; A motor, coupled to the exhaust fan; a control unit, coupled to the motor; a timing unit, coupled to the control unit, for timing; a human body sensor, coupled to the control unit, for sensing human movement; a first temperature sensor, coupled to the control unit, for sensing the temperature of the exhaust gas or cooking fumes; a second temperature sensor, coupled to the control unit, for sensing the ambient temperature; a smoke sensor, coupled to the control unit, for sensing the smoke level of the exhaust gas or cooking fumes; and a light source element, coupled to the control unit, for displaying the operating status of the intelligent range hood; wherein... When the human body sensor detects human movement, it generates a signal, and the control unit controls the motor to drive the exhaust fan to expel the exhaust gas or fumes from the kitchen based on the signal. When the human body sensor does not generate a signal, the control unit controls the timing unit to start timing, and when the timing unit finishes timing, it controls the motor to stop driving the exhaust fan to expel the exhaust gas or fumes from the kitchen. The control unit controls the light source element to display different light signals and controls the motor to drive the exhaust fan at different power levels to expel the exhaust gas or fumes from the kitchen based on the smoke value of the exhaust gas or fumes sensed by the smoke sensor, or the temperature difference between the exhaust gas or fumes sensed by the first temperature sensor and the ambient temperature sensed by the second temperature sensor. When the control unit determines that the smoke value is less than a first predetermined smoke value or the temperature difference is less than a first predetermined temperature difference, the control unit controls the light source element to display a first gear indicator and controls the motor to drive the exhaust fan to exhaust the exhaust gas or oil fumes from the kitchen at a first exhaust power.

2. The smart range hood as described in claim 1, wherein the second temperature sensor is disposed on a panel of the smart range hood, and the first temperature sensor and the smoke sensor are disposed on an air duct of the smart range hood.

3. The intelligent range hood as described in claim 1, wherein when the control unit determines that the smoke value is greater than the first predetermined smoke value and less than a second predetermined smoke value, or the temperature difference is greater than the first predetermined temperature difference and less than a second predetermined temperature difference, the control unit controls the light source element to display a second-level light indicator, and controls the motor to drive the exhaust fan to exhaust the exhaust gas or fumes from the kitchen at a second exhaust power, wherein the second predetermined temperature difference is greater than the first predetermined temperature difference, the second predetermined smoke value is greater than the first predetermined smoke value, and the second exhaust power is greater than the first exhaust power.

4. The intelligent range hood as described in claim 3, wherein when the control unit determines that the smoke value is greater than the second predetermined smoke value or the temperature difference is greater than the second predetermined temperature difference, the control unit controls the light source element to display a third level light, and controls the motor to drive the exhaust fan to exhaust the exhaust gas or oil fumes from the kitchen at a third exhaust power, wherein the third exhaust power is greater than the second exhaust power.

5. The intelligent range hood as described in claim 4, wherein the first exhaust power is 8 cubic meters per minute, the second exhaust power is 14 cubic meters per minute, and the third exhaust power is 18.5 cubic meters per minute.

6. The intelligent range hood as described in claim 1, wherein the time interval between the start and end of the timing unit is 5 minutes.

7. The intelligent range hood as described in claim 1, wherein the human body sensor is a proximity sensor.

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