TWI673458B - Range hood with image detection and control method thereof - Google Patents

Abstract

An exhaust hood with a thermal image detection function and a control method thereof. The range hood is suitable for detecting the thermal image distribution of the heating device. The range hood includes a thermal image detection circuit, a control circuit and an exhaust circuit. The thermal image detection circuit can obtain the temperature plane distribution data of the heating device. The control circuit obtains a first detection result of the thermal image detection circuit at a first sampling period, and when the first detection result meets a slow start condition, the control circuit starts the exhaust circuit to operate. And the control circuit obtains the second detection result of the thermal image detection circuit at a second sampling period, and when the second detection result meets the fast start condition, the control circuit starts the exhaust circuit to operate, wherein the second sampling period is less than the first Sampling period. Therefore, the present invention can automatically open the exhaust operation of the range hood according to the detection result of the thermal image.

Description

Range hood with thermal image detection function and control method thereof

The invention relates to an exhaust device, and more particularly, to an exhaust hood with a thermal image detection function and a control method thereof.

Exhaust hoods are common household appliances in existing kitchens. The main operation of the range hood is to turn the fan to exhaust the fumes produced during the cooking process. Generally speaking, the range hood is provided with a plurality of buttons with different fan speeds for users to press to start operation. However, in this manual starting method, when a person is cooking, he must lower his cooking utensils in order to start the range hood by manually pressing the button. Similarly, when cooking is complete, the above-mentioned button must be manually pressed again to turn off the range hood.

Embodiments of the present invention provide a range hood with a thermal image detection function and a control method thereof, which allow the range hood to perform intelligent operation control relatively automatically according to a thermal image detection result.

An embodiment of the present invention provides a range hood with a thermal image detection function, which is suitable for detecting the thermal image distribution of a heating device. The range hood includes a thermal image detection circuit, a control circuit and an exhaust circuit. The thermal image detection circuit has a plurality of thermal image detectors to obtain a temperature plane distribution data of the heating device. The temperature plane distribution data includes multi-point temperature detection values, and any temperature detection value is image detection. Device Temperature detection results. The control circuit is electrically connected to the thermal image detection circuit and the exhaust circuit. The control circuit obtains a first detection result of the thermal image detection circuit at a first sampling period, and when the first detection result meets a slow start condition, the control circuit starts the exhaust circuit to operate. And the control circuit obtains the second detection result of the thermal image detection circuit at a second sampling period, and when the second detection result meets the fast start condition, the control circuit starts the exhaust circuit to operate, wherein the second sampling period is less than the first Sampling period.

An embodiment of the present invention provides a control method for a range hood, which is suitable for detecting the thermal image distribution of a heating device. The range hood has a thermal image detection circuit, and the thermal image detection circuit has a plurality of thermal image detectors. Obtaining a temperature plane distribution data of the heating device, wherein the temperature plane distribution data includes multi-point temperature detection values, and any temperature detection value is a temperature detection result of an image detector. The method includes obtaining heat at a first sampling cycle The first detection result of the image detection circuit, and when the first detection result meets the slow start condition, the exhaust circuit of the range hood is started to operate. The second detection result of the thermal image detection circuit is obtained at a second sampling period, and the exhaust circuit is started to operate when the second detection result meets the fast start condition, wherein the second sampling period is shorter than the first sampling period.

In summary, the range hood with a thermal image detection function and a control method thereof provided by the embodiments of the present invention can determine relatively slow or fast startup based on different usage conditions of the cooking heat source through thermal image detection. Exhaust operation. In addition to reducing manual operation, it can also provide automatic startup operation with precision.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and attached drawings are only used to illustrate the present invention, not the right to the present invention. No limitation on scope.

1‧‧‧ Range Hood

10‧‧‧ thermal image detection circuit

101‧‧‧ thermal image detector

12‧‧‧Control circuit

121‧‧‧ Slow Start Circuit

123‧‧‧Quick Start Circuit

125‧‧‧High temperature protection circuit

127‧‧‧Auto close circuit

14‧‧‧Exhaust circuit

141‧‧‧Drive circuit

143‧‧‧fan circuit

301‧‧‧hot spots

S401‧‧‧Enable thermal image detection function

S403‧‧‧Slow start detection

S405‧‧‧Quick start detection

S407‧‧‧Exhaust circuit start

S409‧‧‧Start high temperature detection

S411‧‧‧Start automatic shutdown detection

S413‧‧‧Closed

S415‧‧‧Stop

S501‧‧‧Read thermal image array data

S503‧‧‧Calculation of temperature distribution

S505‧‧‧Offset monitoring

S507‧‧‧ monitoring data is sufficient

S509‧‧‧Data Analysis

S511‧‧‧ meets the slow start conditions

S513‧‧‧Start

S601‧‧‧Read thermal image array data

S603‧‧‧The highest temperature before reading M pen

S605‧‧‧Calculate average temperature

S607‧‧‧ eligible for quick start

S609‧‧‧Start

S701‧‧‧Read thermal image array data

S703‧‧‧climb slope detection

S705‧‧‧Quick judgment detection

S707‧‧‧High temperature abnormal

S709‧‧‧ Output prompt message

S801‧‧‧Read thermal image array data

S803‧‧‧Descent slope detection

S805‧‧‧Closed

S807‧‧‧reduce speed

S809‧‧‧The preset time is up

S811‧‧‧Stop

FIG. 1 is a schematic diagram of a range hood with a thermal image detection function according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a thermal image detection circuit provided by an embodiment of the present invention.

FIG. 3A is a schematic diagram of a thermal image screen according to an embodiment of the present invention.

FIG. 3B is a schematic diagram of a thermal image screen according to an embodiment of the present invention.

FIG. 4 is a control flowchart of a range hood provided by an embodiment of the present invention.

5 is a flowchart of a slow start operation of the range hood provided by an embodiment of the present invention.

6 is a flowchart of a quick start operation of the range hood provided by an embodiment of the present invention.

FIG. 7 is a high-temperature protection operation flowchart of the range hood provided by the embodiment of the present invention.

FIG. 8 is a flowchart of an automatic shutdown operation of a range hood provided by an embodiment of the present invention.

Embodiments of the present invention provide a range hood with a thermal image detection function and a control method thereof. Specifically, the heating device and the range hood in the kitchen equipment are usually used together. However, in addition to the basic range hood function operation, the range hood in this embodiment also integrates a thermal sensing temperature detection function. The active and large-scale heat source change detection can be generated for various cooking behaviors in the heating device, and the operation of the range hood can be automatically started or turned off automatically through this detection result, thereby effectively reducing the manual operation of the range hood. It is inconvenient to operate and can more accurately judge the temperature changes of various heat sources during the cooking process of the heating device, so that the range hood can provide various intelligent controls accordingly. The heating device may be various cooking equipments such as a gas stove or an induction cooker that provide heating and cooking. For the sake of convenience, the gas stove is used as the following explanation.

[An embodiment of a range hood with a thermal image detection function]

Please refer to FIG. 1, which is a schematic diagram of a range hood with a thermal image detection function according to an embodiment of the present invention. The range hood 1 with the thermal image detection function of this embodiment can pass a wide-area detection of the temperature of the heat source, and can relatively provide a friendly operation with intelligent control. In one embodiment, the range hood 1 may include a thermal image detection circuit 10, a control circuit 12 and an exhaust circuit 14. The thermal image detection circuit 10 is electrically connected to the control circuit 12, The control circuit 12 is electrically connected to the exhaust circuit 14. The thermal image detection circuit 10 can detect the temperature of the heat source generated by the gas furnace, and the temperature detection range can cover the range of the heating area provided by the gas furnace. In one embodiment, the thermal image detection circuit 10 has a plurality of thermal image detectors 101, and the thermal image detector 101 is, for example, shown in FIG. 2 and arranged directly above the gas furnace in an array plane distribution. This wide-area setting method can effectively detect various heat source temperature changes in each heating area when the gas furnace is used. However, the present invention is not limited to the number and distribution of the thermal image detectors 101 as long as the heating temperature change of the gas furnace can be successfully detected. Here, the thermal image detector 101 can convert the intensity of thermal radiation emitted from the surface of the object to be detected into thermal images with relatively different temperature distributions. In one embodiment, the thermal image detector 101 can be infrared thermal Image detector, but the invention is not limited to this.

The control circuit 12 can provide intelligent humanized operation control relatively according to the detection result of the thermal image detection circuit 10. In one embodiment, the control circuit 12 can learn the use status of the gas stove according to the detection result of the thermal image detection circuit 10, such as whether there are various possible use conditions such as cooking or the amount of firepower used during cooking. When the control circuit 10 learns the use condition of the gas furnace, it can correspondingly control the automatic start operation or automatic stop operation of the range hood 1. In an embodiment, when the control circuit 12 learns that cooking is started, it may output a driving signal to the exhaust circuit 14 so that the exhaust circuit 14 starts to operate. In an embodiment, when the control circuit 12 learns that the high temperature during cooking continues to increase and harms the cookware, the control circuit 12 may also alert the relevant personnel or wirelessly control the stove to shut down. In an embodiment, when the control circuit 12 learns that the cooking is finished, the control circuit 12 may output a driving signal to the exhaust circuit 14 to stop the exhaust circuit 14 from operating.

The exhaust circuit 14 may include, for example, a driving circuit 141 and a fan circuit 143. The driving circuit 141 is electrically connected to the fan circuit 143 and controls the fan circuit 143 according to a driving signal output by the control circuit 12. In an embodiment, when the driving circuit 141 receives a driving signal representative of starting, the fan circuit 143 is controlled to start running, so that the fume hood 1 can start to exhaust smoke. And when the driving circuit 141 receives a representative When the driving signal is stopped, the fan circuit 143 is controlled to stop the operation, and the exhaust hood 1 is turned off to stop exhausting the smoke. It is also worth noting that the control circuit 12 can further provide driving signals with different rotation speeds to control the fan circuit 143 to operate at different motor rotation speeds through the driving circuit 141.

It is worth noting that, in an embodiment, the control circuit 12 reads multiple temperature plane distribution data of the detection result of the thermal image detection circuit 10 through several sampling cycles, and performs statistics and analysis on the multiple temperature plane distribution data. Related calculations, you can know the current dynamic and static cooking behavior of gas stoves. For example, in a single sampling cycle, the control circuit 12 obtains all the detection results of all the thermal image detectors 101 at the same time, that is, each thermal image detector 101 outputs a temperature detection value, and the temperature detection The numerical value can reflect the temperature change of the heat source image corresponding to the detection position of the thermal image detector 101. For example, for the thermal image detection circuit 10, the temperature plane distribution data formed by the output of all the thermal image detectors 101 can be shown in FIG. 3A and FIG. 3B, for example. In terms of the thermal image in FIG. 3A, the hot spot 301 represents the detection result of a certain thermal image detector 101, and the color depth of the hot spot 301 or the size of the hot spot may change correspondingly with the temperature of the heat source. It can be seen by comparing FIG. 3A and FIG. 3B that the distribution area and density of the hot spots 301 in FIG. 3B are more obvious than those in FIG. 3A. Therefore, for the control circuit 12, by analyzing and calculating the relevant data of the thermal images in FIG. 3A and FIG. 3B, it can be known that the gas stove is cooking, and the temperature rises as the cooking time changes from FIG. 3A to FIG. 3B. high.

In one embodiment, the control circuit 12 may further include a slow start circuit 121, a fast start circuit 123, a high temperature protection circuit 125, and an automatic shutdown circuit 127. The slow start circuit 121 and the fast start circuit 123 are both used to determine when to start the operation of the exhaust circuit 14. The slow-start circuit 121 may detect, for example, a use condition of a low-temperature cooking of a gas stove. The quick-start circuit 123 may detect, for example, the use condition of the gas stove cooking. After the high-temperature protection circuit 125 starts to operate, the high-temperature protection circuit 125 determines whether or not the cooking pot on the gas stove has generated high temperature at this time, and can determine whether to output the prompt information according to the determination result. The automatic shutdown circuit 127 determines whether to stop cooking on the gas stove after the exhaust circuit 14 is started, and can determine whether to control the exhaust circuit 14 to stop operation based on the determination result. The determination processing method of each circuit in the control circuit 12 is only an example, and the present invention is not limited thereto.

In this embodiment, the slow start circuit 121 obtains the first detection result of the thermal image detection circuit 10 at a first sampling period, and when the first detection result meets the slow start condition, the slow start circuit 121 starts. The exhaust circuit 14 operates. For example, the first sampling period includes, for example, multiple sampling periods, so the first detection result may include multiple sampling data of temperature plane distribution data, and the slow start condition is, for example, setting the gas stove to cook on low fire. The corresponding preset heat source density drives the change during cooking. Therefore, after the slow start circuit 121 performs numerical statistics and analysis calculations on the first detection result, if the first detection result conforms to the preset heat source density driving force change, the slow start circuit 121 can control the exhaust circuit 141 Start running.

The quick start circuit 123 obtains the second detection result of the thermal image detection circuit 10 at a second sampling period, and when the second detection result meets the quick start condition, the quick start circuit 123 starts the exhaust circuit 14 to operate. For example, the second sampling period is, for example, a single sampling period, so the second detection result is sampling data of a single temperature plane distribution data, and the fast start condition is, for example, a preset high temperature start value. Therefore, when the fast-start circuit 123 determines that the high-temperature average value of the highest temperature detection value of the first M point temperature in the temperature plane distribution data in the second detection result is equal to or greater than a preset high-temperature start value, the fast-start circuit 123 can control the discharge The gas circuit 14 is started. Since the fast start circuit 123 only needs to determine a single sampling data of a single sampling period is far less than the slow start circuit 121 needs to determine multiple sampling data of multiple sampling periods, the judgment required by the fast start circuit 123 to start the exhaust circuit 14 The time is much shorter than the slow start circuit 121, so it has a fast start effect.

After the high-temperature protection circuit 125 is activated, when the detection result of the thermal image detection circuit 10 meets a high-temperature protection condition after the exhaust circuit 14 is activated, it outputs a prompt message so that a person or a gas furnace can stop the heating operation according to the prompt information. For example, where The high temperature compliance condition is the highest temperature detection value of the highest temperature of the first N points in the temperature plane distribution data. An high temperature average value corresponds to an abnormal high temperature value, or the high temperature compliance condition is each highest temperature value in multiple continuous temperature plane distribution data. The mutually constituted slopes conform to a preset rising slope value.

After the exhaust circuit 14 is activated, the automatic shutdown circuit 127 controls the exhaust circuit 14 to run at a slow speed for a preset time according to the detection result of the thermal image detection circuit 10 when it meets a shutdown condition, or Close directly, the invention is not limited to this. For example, the closing condition is that a slope formed between each of the highest temperature values in a plurality of continuous temperature plane distribution data meets a preset falling slope value.

[Operation Example of Range Hood with Thermal Image Detection Function]

With reference to FIG. 1 and FIG. 4, FIG. 4 is an operation flowchart of the range hood provided by the embodiment of the present invention. In addition to manual operation, the operation method of the range hood 1 described in this embodiment may also automatically start related operations according to the set conditions, but the present invention is not limited thereto. The process shown in FIG. 4 may perform the following steps in cooperation with the architecture of FIG. 1, for example.

In step S401, first the range hood 1 activates the thermal image detection function. Specifically, when the range hood 1 is powered on, the thermal image detection circuit 10 can obtain working power and start temperature detection at this time, but the exhaust circuit 14 at this time has not yet started to operate.

In step S403, the range hood 1 performs slow start detection. In step S403, the control circuit 12 can determine whether it meets the slow start condition according to the detection result of the thermal image detection circuit 10, and then decide whether to start the exhaust circuit 14 to operate. The specific judgment method of step S403 will be described in detail later.

In step S405, the range hood 1 performs a quick start detection. In step S405, the control circuit 12 can determine whether the quick start condition is met according to the detection result of the thermal image detection circuit 10, and then decide whether to start the exhaust circuit 14 to operate. The specific judgment method of step S405 will be described in detail later.

In step S407, it is determined whether the exhaust circuit 14 is activated. According to step S403 Or the judgment result of one of steps S405 can be known whether the exhaust circuit 14 is started or not, and only one step of step S403 or step S405 is required to determine whether the exhaust circuit 14 is started. When the determination in step S407 is no, step S403 and step S405 are repeatedly performed. In addition, the execution of steps S403 and S405 is not limited to the execution order, but may be performed simultaneously, for example.

In step S409, when the exhaust circuit 14 is activated, the high temperature detection is further activated. In step S409, the control circuit 12 can determine whether the high temperature protection condition is met according to the detection result of the thermal image detection circuit 10, and then decide whether to perform a subsequent procedure of the high temperature protection. The specific judgment method of step S409 will be described in detail later.

In step S411, automatic shutdown detection is activated. In step S411, the control circuit 12 can determine whether the shutdown condition is met according to the detection result of the thermal image detection circuit 10, and then decide whether to follow up the procedure of closing the exhaust circuit 14. The specific judgment method of S411 will be explained in detail later.

In step S413, it is determined whether the exhaust circuit 14 is to be turned off. This step S413 can know whether to turn off the exhaust circuit 14 according to the execution result of step S411. When it is determined in step S413 otherwise, return to step S409 to continue execution. When the determination in step S413 is YES, the process stops.

In step S415, the exhaust operation is stopped. In this step S415, when the control circuit 12 learns that it is closed according to the detection result of the thermal image detection circuit 10, the control circuit 12 controls the exhaust circuit 14 in the starting operation to stop operation.

[Operation Example of Slow Start Detection]

With reference to FIG. 1 and FIG. 5, FIG. 5 is a flowchart of a slow start operation of the range hood provided by an embodiment of the present invention. The slow-start operation of the range hood 1 described in this embodiment is further described with reference to S403 in FIG. 4, but the present invention is not limited thereto. The process shown in FIG. 5 can perform the following steps, for example, in cooperation with the architecture of FIG. 1.

In step S501, the thermal image array data is read. Specifically, the thermal image detection circuit 10 reads a piece of temperature plane distribution data according to the control of the control circuit 12. The temperature plane distribution data may be similar to the thermal image distribution situation shown in FIG. 3A or 3B.

In step S503, a temperature distribution amount calculation is performed. In this step S503, the control circuit 12 calculates the distribution status of each temperature according to the first detection result of this temperature plane distribution data according to the execution result of step S501. For example, in this step S503, the number of hot spots at each temperature in the temperature plane distribution data is counted and the number of hot spots with the same temperature is accumulated.

In step S505, offset monitoring is performed. In this step S505, the control circuit 12 can track and track the cumulative number of hot spots at a certain temperature according to the calculation result of step S503. For example, it can track the peak with the highest cumulative number of hot spots.

In step S507, it is determined whether the monitoring data is sufficient. This step S507 is to determine whether the number of temperature plane distribution data read from the foregoing S501 has met the number set in the first sampling period. For example, the first sampling period may be set to read 10 temperature plane distribution data.

In step S509, data analysis is performed. In step S509, the peak with the largest cumulative number of hot spots in each temperature plane distribution data during the execution of the aforementioned first sampling cycle is tracked and analyzed, so that the change in the driving force of the heat source density can be obtained.

In step S511, it is determined whether the slow start condition is met. This step S511 compares the density trend change obtained in step S509 with a slow start condition. The slow start condition is, for example, the change in the preset heat source density corresponding to a gas stove cooking at a low fire. However, the present invention does not use the This is limited.

In step S513, the control circuit 12 starts the operation of the exhaust circuit 14. In step S513, when the density trend change obtained in step S509 is compared with the slow start condition, the exhaust circuit 14 is automatically started to operate. If the comparison result of S511 is not consistent, the process returns to step S501 to continue execution.

[Operation Example of Quick Start Detection]

With reference to FIG. 1 and FIG. 6, FIG. 6 is a flowchart of a quick start operation of the range hood provided by an embodiment of the present invention. The quick start operation of the range hood 1 described in this embodiment is further described with reference to S405 in FIG. 4, but the present invention is not limited thereto. The process shown in FIG. 6 may perform the following steps in cooperation with the architecture of FIG. 1, for example.

In step S601, the thermal image array data is read. Specifically, the thermal image detection circuit 10 reads a piece of temperature plane distribution data according to the control of the control circuit 12, and the temperature plane distribution data may be similar to the thermal image distribution situation shown in FIG. 3A or FIG. 3B.

In step S603, the data of the highest temperature at the previous M point is read. In this step S603, the control circuit 12 reads the highest temperature data of the first M points of the temperature plane distribution data according to the execution result of step S601. For example, the M value is, for example, 5 points, but the present invention is not limited thereto.

In step S605, an average high temperature is calculated. In this step S605, the control circuit 12 performs an average calculation on the temperature value of the M point read in step S603 to obtain an average high temperature.

In step S607, it is determined whether the high-temperature starting condition is met. The high-temperature starting condition described in this step S607 is, for example, a preset high-temperature starting value, and when the average high temperature is greater than or equal to the preset high-temperature starting value, it is determined to be consistent, otherwise it is not consistent.

In step S609, the control circuit 12 starts the operation of the exhaust circuit 14. In step S609, when it is determined in step S607 that the high-temperature starting conditions are met, the exhaust circuit 14 is automatically started to run. If the result of the SS607 judgment is not consistent, the process returns to step S601 to continue execution.

[Operation Example of High Temperature Protection Detection]

With reference to FIG. 1 and FIG. 7, FIG. 7 is a flowchart of the high-temperature protection operation of the range hood provided by the embodiment of the present invention. The high-temperature protection operation of the range hood 1 described in this embodiment is further described with reference to step S409 in FIG. 4, but the present invention is not limited thereto. The process shown in FIG. 7 may perform the following steps in cooperation with the architecture of FIG. 1, for example.

In step S701, the thermal image array data is read. Specifically, the thermal image detection circuit 10 reads a piece of temperature plane distribution data according to the control of the control circuit 12, and the temperature plane distribution data may be similar to the thermal image distribution situation shown in FIG. 3A or FIG. 3B.

In step S703, the climbing slope is detected. In this step S703, the control circuit 12 compares the highest temperature values of each point to obtain a plurality of temperature plane distribution data according to the execution result of step S701, and compares the obtained highest temperature values with the high temperature protection conditions. The high-temperature protection conditions described herein are, for example, a preset slope change or need to be greater than a preset rising slope value. That is to say, when the slope formed by the connection between these obtained maximum temperature values conforms to the preset slope change or is greater than the preset rising slope value, a high temperature abnormality can be determined.

In step S705, a fast decision detection is performed. The execution manner in step S705 is similar to the operation manner in FIG. 6, but only the rapid compliance condition in step S607 is changed to a high temperature protection condition, and the high temperature protection condition may be, for example, an abnormal high temperature value, and the abnormal The high temperature value is greater than a preset high temperature start value. Therefore, when the average high temperature is greater than or equal to the abnormal high temperature value, it is considered that a high temperature abnormality can be identified.

In step S707, it is determined whether the high temperature is abnormal. In step S707, if any high-temperature abnormality occurs according to the execution result of step S703 or step S705, the control circuit 12 directly determines that a high-temperature abnormal phenomenon has occurred.

In step S709, a prompt message is output. In step S709, when it is determined in step S707 that the high temperature abnormality is met, the control circuit 12 outputs a prompt message. In an embodiment, the gas furnace may further be provided with a reminder circuit electrically connected to the control circuit, and the reminder circuit may be used to output a sound signal or display the relevant prompt information of the signal to inform the relevant personnel that an abnormal high temperature has occurred during the cooking process Anomalies. In addition, in an embodiment, the control circuit 12 may further wirelessly output the prompt message to the gas furnace, so that the gas furnace can stop the heating operation of the gas furnace accordingly after receiving the prompt message wirelessly, so as to prevent the abnormal high temperature from continuously rising .

[Example of operation of automatic shutdown]

With reference to FIG. 1 and FIG. 8, FIG. 8 is a flowchart of an automatic shutdown operation of the range hood provided by an embodiment of the present invention. The automatic shutdown operation of the range hood 1 described in this embodiment is further described with reference to S411 in FIG. 4, but the present invention is not limited thereto. The process shown in FIG. 8 may perform the following steps in cooperation with the architecture of FIG. 1, for example.

In step S801, the thermal image array data is read. Specifically, the thermal image detection circuit 10 reads one or more temperature plane distribution data according to the control of the control circuit 12, and the temperature plane distribution data may be similar to the thermal image distribution status shown in FIG. 3A or FIG. 3B.

In step S803, the falling slope is detected. In this step S803, the control circuit 12 compares the highest temperature values of each point to obtain several temperature plane distribution data according to the execution result of step S801, and compares the obtained highest temperature values with the closing conditions, as described herein. The closing condition is, for example, a preset slope change or needs to be smaller than a preset falling slope value. That is, when the slope formed by the connection between these obtained maximum temperature values conforms to the preset slope change or is smaller than the preset falling slope value, the shutdown phenomenon can be considered to have occurred.

In step S805, it is determined whether to close. In this step S805, the control circuit 12 can know whether there is a shutdown or not according to the execution result of step S803. If it is determined as YES in step S805, step S807 is performed, and if it is determined as otherwise in step S805, step S801 is performed.

In step S807, the rotation speed is reduced. When the control circuit 12 can be judged to be closed according to step S805 in this step S807, the control circuit 12 controls the exhaust circuit 14 which is still in operation to reduce the rotation speed and operate for a preset time.

In step S809, it is determined whether the preset time is up. If step S809 determines YES, step S811 is performed, and if step S809 determines otherwise, step S809 is continued.

In step S811, the operation is stopped. In this step S811, the control circuit 12 controls the exhaust circuit 14 to stop running, so that the range hood enters the shutdown to stop the exhaust according to this. status.

In addition, in an embodiment, when the determination in step S805 is YES, the control circuit 12 may also directly control the exhaust circuit 14 to stop operation.

[Effects of Examples]

In summary, the range hood with a thermal image detection function and a control method thereof provided by the embodiments of the present invention can automatically start or close exhaust related operations through the results of thermal image detection without human intervention. . In addition, overheating detection is provided during the cooking process, which can effectively protect the pots from damage due to high temperatures.

The above description is only an embodiment of the present invention, and is not intended to limit the patent scope of the present invention.

Claims (8)

A range hood with thermal image detection function, suitable for detecting the thermal image distribution of a heating device, includes: a thermal image detection circuit with multiple thermal image detectors to obtain a temperature of the heating device Plane distribution data, wherein the temperature plane distribution data includes multi-point temperature detection values, and any of the temperature detection values is the temperature detection result of the image detector; an exhaust circuit; and a control circuit, electrical Connecting the thermal image detection circuit and the exhaust circuit; wherein the control circuit obtains a first detection result of the thermal image detection circuit in a first sampling period, and the first detection result meets a slow speed When starting conditions, the control circuit automatically starts the exhaust circuit operation; wherein the control circuit obtains a second detection result of the thermal image detection circuit in a second sampling period, and when the second detection result matches a In a quick start condition, the control circuit automatically starts the exhaust circuit operation; wherein the second sampling period is less than the first sampling period; wherein the first detection result is multiple temperature plane distribution data obtained through multiple sampling periods Corresponding to the change in the heat source density trend, the slow start condition is that the heating device cooks at a low fire corresponding to the preset heat source density trend change; wherein the second detection result is the temperature plane distribution data obtained through a single sampling period A high temperature average value of the temperature detection value with the highest temperature at the middle and front M points. The fast start condition is a preset high temperature start value; where a single sampling period means that the control circuit obtains all the thermal image detectors at the same time. All detection results are used as the temperature plane distribution data. According to the range hood of claim 1, wherein the control circuit outputs a prompt message when the control circuit meets a high temperature protection condition according to the detection result of the thermal image detection circuit after the exhaust circuit is activated, So that the heating device can stop the heating operation according to the prompt message. The range hood of claim 2, wherein the high-temperature protection condition is a high-temperature average value of the temperature detection value of the highest N-point temperature in the temperature plane distribution data that matches an abnormal high-temperature value, and the high-temperature protection conditions are multiple The slope formed between each maximum temperature value in the continuous temperature plane distribution data conforms to a preset rising slope value. The range hood of claim 2, wherein the control circuit controls the exhaust circuit when the control circuit meets a shutdown condition according to the detection result of the thermal image detection circuit after the exhaust circuit is activated A slow speed rotation is performed after a preset time, and the shutdown condition is that the closing condition is that the slope formed between each maximum temperature value in the continuous temperature plane distribution data conforms to a preset descending slope value. A control method of a range hood, suitable for detecting a thermal image distribution of a heating device, the range hood has a thermal image detection circuit, the thermal image detection circuit has a plurality of thermal image detectors to obtain the A temperature plane distribution data of the heating device, wherein the temperature plane distribution data includes multi-point temperature detection values, and any of the temperature detection values is the temperature detection result of the image detector, the method includes: taking a first Acquiring a first detection result of the thermal image detection circuit during the sampling period, and automatically starting operation of an exhaust circuit of the range hood when the first detection result meets a slow start condition; and Two sampling cycles to obtain a second detection result of the thermal image detection circuit, and when the second detection result meets a quick start condition, automatically start the exhaust circuit operation; wherein the second sampling cycle is less than the first A sampling period; wherein the first detection result is a change in the heat source density trend corresponding to multiple pieces of temperature plane distribution data obtained through multiple sampling periods, and the slow start condition is a preset corresponding to the heating device cooking on a low fire The heat source density trend changes; wherein the second detection result is a high temperature average value of the temperature detection value with the highest temperature at the previous M point in the temperature plane distribution data obtained through a single sampling period, and the quick start condition is a preset High temperature start value; where a single sampling cycle refers to obtaining all the detection results of all the thermal image detectors simultaneously as the temperature plane distribution data. The control method of claim 5, wherein after the exhaust circuit is activated, when the range hood meets a high-temperature protection condition according to the detection result of the thermal image detection circuit, the range hood outputs a prompt message so that The heating device can stop the heating operation according to the prompt message. The control method according to claim 6, wherein the high-temperature compliance condition is a high-temperature average value of the temperature detection value with the highest N-point pen temperature in the temperature plane distribution data conforms to an abnormal high-temperature value, and the high-temperature compliance condition is multiple The slope formed between each maximum temperature value in the continuous temperature plane distribution data conforms to a preset rising slope value. The control method according to claim 6, wherein after the control circuit starts the exhaust circuit, the control circuit controls the exhaust circuit according to the detection result of the thermal image detection circuit when a shutdown condition is met, the control circuit controls the exhaust circuit The operation is performed at a slow speed after a preset time, and the shutdown condition is that the closing condition is that the slope formed between each maximum temperature value in multiple continuous temperature plane distribution data conforms to a preset descending slope value.