Resistance detection system and method

Abstract

The application relates to the technical field of heating non-combustion, in particular to a resistance detection system and method of a heater. The resistance detection system comprises a temperature detection unit, a power supply, a resistance measurement unit and a control unit. Since the resistance value of the heater continuously increases or continuously decreases with the increase of temperature, the resistance value of the heater also increases or decreases to a target value when the heater reaches a preset temperature under the condition of power supply. The resistance detection system of the application obtains the target value and records the target value under the condition of simultaneously detecting the temperature and the resistance of the heater, and the target value is used for subsequent heating control. Preferably, one control unit is connected with multiple temperature detection units and resistance measurement units, so that batch detection of the heater is realized.

Description

Technical Field

[0001] This invention relates to a resistance detection system and a resistance detection method for heaters. Background Technology

[0002] Low-temperature heated tobacco, also known as heated non-combustible tobacco, is commonly found in the form of cigarettes. However, unlike traditional cigarettes that produce smoke through combustion, low-temperature heated tobacco, designed with the concept of "heating without combustion," heats tobacco leaves just enough to release their flavor without igniting them, significantly reducing harmful substances in both first-hand and second-hand smoke. PCT / EP2010 / 006598 discloses a smoke-generating system in which the heater includes multiple conductive tracks on an electrically insulating substrate. The electrically insulating substrate is rigid and arranged to be inserted into the substrate forming a float. The conductive tracks have a resistance temperature coefficient characteristic that allows them to function as both resistance heaters and temperature sensors. In actual production processes, the consistency of the heaters is not high enough, resulting in differences in the resistance temperature coefficient characteristics of each heater, which makes temperature control during heater use difficult. Summary of the Invention

[0003] Therefore, in order to solve the temperature control problem of the heater, it is indeed necessary to provide a resistance detection system and resistance detection method for the heater.

[0004] The resistance detection system provided in this embodiment of the invention includes:

[0005] A temperature detection unit includes at least one non-contact temperature sensor for detecting the temperature of the heater;

[0006] A power source for supplying electrical energy to the heater;

[0007] A resistance measuring unit is electrically connected to the heater to measure its resistance value;

[0008] The control unit is connected to the temperature detection unit and the resistance measurement unit respectively. The heater heats up under the power supply. When the temperature detection unit detects that the heater has reached the preset temperature, it records the resistance value of the heater at this temperature.

[0009] In another embodiment of the invention, the resistance measuring unit is integrated into a control board that is electrically connected to the heater.

[0010] In another embodiment of the present invention, the control board includes a storage unit, and the control unit writes the resistance value of the heater when it reaches a preset temperature into the storage unit.

[0011] In another embodiment of the present invention, the control unit includes a first control subunit and a second control subunit, the first control subunit and the second control subunit being communicatively connected, the first control subunit being integrated into the control board, and the second control subunit being communicatively connected to the temperature detection unit; the temperature detection unit detects that the heater has reached a preset temperature, the second control subunit sends a signal to the first control subunit, and the first control subunit records the resistance value of the heater at this temperature.

[0012] In another embodiment of the present invention, the power supply is electrically connected to the control board, and the control board, the heater, and the power supply constitute at least a part of the finished or semi-finished product of the electric heating appliance.

[0013] In another embodiment of the invention, the temperature detection unit includes at least two temperature sensors for measuring the temperature at the same location or area of ​​the heater.

[0014] In another embodiment of the invention, the temperature detection unit includes at least two temperature sensors for measuring the temperature at different locations or areas of the heater.

[0015] In another embodiment of the present invention, the temperature detection unit includes at least two temperature sensors, and the preset temperature is at least one of the average temperature, the highest temperature, and the lowest temperature detected by each temperature sensor.

[0016] In another embodiment of the present invention, the temperature detection unit includes at least two temperature sensors. If the temperature difference detected by the two temperature sensors is less than a threshold, the resistance value of the heater at this temperature is recorded; otherwise, it indicates a detection error and the detection is repeated.

[0017] In another embodiment of the present invention, the temperature sensor is an infrared temperature sensor, and the temperature variation range of the heater is within the range of the infrared temperature sensor.

[0018] In another embodiment of the invention, the heater is positioned at the optimal measurement location of the infrared temperature sensor.

[0019] In another embodiment of the invention, a fixing unit for fixing the heater is also included.

[0020] In another embodiment of the invention, a position adjustment unit is further included, connected to the fixing unit and / or the temperature detection unit, to adjust the relative position of the heater and the temperature sensor.

[0021] In another embodiment of the present invention, the preset temperature includes at least a first preset temperature and a second preset temperature, and the control unit records the first resistance value and the second resistance value of the heater corresponding to the temperature.

[0022] In another embodiment of the present invention, the temperature detection unit detects the temperature of the heater in real time, the resistance measurement unit detects the resistance value of the heater in real time, and the control unit records the relationship between the resistance and temperature of the heater.

[0023] In another embodiment of the present invention, the number of temperature detection units and resistance measurement units in the resistance detection system is greater than two.

[0024] In another embodiment of the invention, the heater is an insertion heater for inserting into the aerosol generating article to heat the aerosol generating substance therein to produce aerosol.

[0025] In another embodiment of the invention, the heater is a cylindrical heater for containing and heating the aerosol-generated product.

[0026] The present invention also provides a resistance detection method, comprising the following steps:

[0027] S1. Fix the distance between the heater and the temperature detection unit so that the heater is within the detection range of at least one temperature sensor installed in the temperature detection unit;

[0028] S2. Supply electrical energy to the heater to raise its temperature, and detect the temperature and resistance value of the heater;

[0029] S3. When the heater reaches the preset temperature, record the resistance value of the heater at this temperature.

[0030] Compared to using the same temperature coefficient of resistance, this invention measures the resistance value of the heater when it reaches a preset temperature and uses this target resistance value for subsequent heating control. If finished or semi-finished electric heating appliances are used for the above testing, the measurement process and the target value writing process are synchronized, making the operation simple, fast, and easily achievable for large-scale industrial production. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the resistance detection system of the present invention;

[0032] Figure 2 This is a schematic diagram of the operation of the resistance detection system in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the operation of the resistance detection system in Embodiment 2 of the present invention;

[0034] Figure 4 This is a schematic diagram of the operation of the resistance detection system in Embodiment 3 of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is described as being "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. The various objects in the accompanying drawings are drawn to scale for ease of illustration, not to scale of the actual components.

[0037] In this invention, "aerosol-generating substances" refers to smoke-producing substances, which are substances that can produce odor and / or nicotine and / or smoke when heated or burned, i.e., atomized substances, i.e., tobacco materials. Tobacco materials can be solid, semi-solid, or liquid. Solid tobacco materials are often processed into thin sheets due to considerations of air permeability, assembly, and manufacturing, hence the common name "sheets," and filamentous sheets are also called thin sheet filaments. The tobacco materials discussed in this invention can be natural or synthetic tobacco liquids, tobacco oils, tobacco gums, tobacco pastes, tobacco shreds, tobacco leaves, etc. For example, synthetic tobacco materials contain glycerin, propylene glycol, and nicotine. The tobacco liquid is liquid, the tobacco oil is oily, the tobacco gum is gel-like, the tobacco paste is paste-like, the tobacco shreds include natural, artificial, or extracted tobacco shreds, and the tobacco leaves include natural, artificial, or extracted tobacco leaves. The tobacco can be heated while encapsulated in other substances, such as in heat-degradable packaging, like microcapsules, where the desired volatile substances are extracted from the degradable or porous encapsulated packaging after heating.

[0038] The tobacco products described in this invention may or may not contain nicotine. Nicotine-containing tobacco products may include at least one of the following: natural tobacco leaf products, e-liquid, e-oil, e-glue, e-paste, shredded tobacco, and tobacco leaves made from nicotine. The e-liquid is water-based, the e-oil is oil-based, the e-glue is gel-based, the e-paste is paste-based, the shredded tobacco includes natural, artificial, or extracted / processed shredded tobacco, and the tobacco leaves include natural, artificial, or extracted / processed tobacco leaves. Nicotine-free tobacco products mainly contain flavoring substances, such as fragrances, which can be atomized to simulate the smoking process and also serve purposes such as smoking cessation. In one embodiment, the fragrance includes peppermint oil. The tobacco products may also include other additives, such as glycerin and / or propylene glycol.

[0039] The "aerosol-generating product" described in this invention refers to a product containing tobacco material that can generate aerosols, such as smoke or mist, through heating, such as cigarettes, cartridges, or cigarette sticks, and is preferably a disposable product. The aerosol-generating product itself cannot provide electrical energy.

[0040] Insertion heaters are configured to be inserted into the interior of low-temperature heated smoke for heating. They are the most common type of heater in the field of heated non-combustible smoke technology, possessing a certain strength and small size. Cylindrical heaters are configured to contain low-temperature heated smoke and heat it externally.

[0041] In existing technologies, heater temperature control is typically based on the temperature coefficient of resistance (TCR). Ideally, the relationship between the conductor's resistance and temperature is essentially linear. However, the conductive path in a small heater volume is usually a thin line distribution, and local variations can significantly impact the resistance characteristics. In actual manufacturing, due to factors such as the materials and processes used, it is difficult to achieve perfect consistency in the initial resistance value and temperature coefficient of resistance. Directly using a fixed temperature coefficient of resistance for temperature control will inevitably lead to inaccurate heating temperature control and directly affect the taste.

[0042] This invention provides a resistance detection system. Figure 1 The structure of the resistance detection system according to an embodiment of the present invention is shown, mainly including a temperature detection unit 100, a power supply 200, a resistance measurement unit 300, and a control unit 400, used for measuring the resistance of a heater 500 (not shown in the figure, see [reference]). Figure 4The resistance of the heater 500 is detected. The heater 500 is preferably an insertion type, and its structure and function are described below. Since the resistance of the heater 500 continuously increases or decreases with increasing temperature, when the heater 500 is powered, its resistance also increases or decreases to a target value when it reaches a preset temperature. The temperature detection unit 100 detects the temperature value, and the resistance measurement unit 300 detects the resistance value. The resistance detection system of this invention acquires and records this target value while simultaneously detecting the heater temperature and resistance for subsequent heating control.

[0043] The temperature detection unit 100 is a core component for detecting the actual heating temperature of the heater 500. It includes at least one temperature sensor 110. When the heater 500 is fixed and at least one temperature sensor 110 is aligned with the heater 500, the resistance detection system can start working. For example, when the heater 500 is powered on, its temperature continuously rises, and the temperature sensor 110 can detect its actual heating temperature. Since the heater 500 is actually inserted into the low-temperature heating smoke for heating during actual use, the detection result of this type of temperature detection unit 100 is close to the temperature condition of the heater 500 under real-world usage conditions.

[0044] 200W power supply, combined with Figure 1 It is understood that the power supply method, such as current, voltage, and pulse frequency, used to supply electrical energy to the heater 500 can be different from that of the actual electric heating appliance, or it can simulate the power supply method of the actual electric heating appliance to achieve an effect closer to the real situation. The form of the power supply 200 can be varied. For example, if the resistance value of the finished or semi-finished heater 500 is directly detected, the power supply 200 of the finished or semi-finished product can be used to power the heater 500. If the object of detection is a single heater 500, it can be directly connected to the external power supply 200.

[0045] Resistance measurement unit 300, combined with Figure 1 It is known that by electrically connecting to the heater 500 and measuring the voltage and current values ​​connected to the heater 500, the resistance value can be calculated. The closer the voltage and current values ​​are to the actual values, the more accurate the measured resistance value will be. Since the resistance value of the heater 500 continuously increases or decreases with the increase of temperature, when the heater 500 is powered, its resistance value also increases or decreases to a target value when it reaches the preset temperature.

[0046] Control unit 400, combined with Figure 1It is known that the heater 500 is connected to the temperature detection unit 100 and the resistance measurement unit 300 respectively. Under the power supply of the power supply 200, the heater 500 heats up. Since the heater 500 is placed on the temperature detection unit 100, the temperature detected by the temperature sensor 110 also rises. If the temperature detection lag or detection error of the temperature sensor 110 is not considered, the temperature detected by the temperature sensor 110 is the actual temperature of the surface of the heater 500. If the temperature detection lag or detection error of the temperature sensor 110 is considered, it can be corrected or compensated by software algorithm. When the temperature detection unit 100 detects that the heater 500 has reached the preset temperature, it retrieves the resistance value detected by the resistance measurement unit 300 at this time and records the resistance value of the heater 500 at this temperature. This resistance value can be used as the target value for subsequent heating control. For example, the optimal heating temperature for a heated non-combustible smoke generator is 300℃. The resistance value of the heater 500 continuously increases with the increase of temperature. The resistance value of the heater 500 when heated to 300℃ is R. In actual use and control, when the measured resistance value of the heater 500 rises to R, it indicates that the optimal heating temperature has been reached, and the power should be reduced or the power supply should be stopped. When the measured resistance value of the heater 500 is lower than R, it indicates that the optimal heating temperature has not yet been reached, and the power supply should continue.

[0047] In another embodiment of the resistance detection system of the present invention, the temperature detection unit 100 includes at least two temperature sensors 110 for measuring the temperature of the same location or area of ​​the heater 500. This location or area refers to the detection range of the temperature detection unit 100 on the surface of the object being measured; only within this detection range will the infrared signal be absorbed by the temperature detection unit 100 and converted into an electrical signal. For example, the same location may be located on the same plane perpendicular to the length extension direction of the heater 500, and the same area may be located within a height range along the length extension direction of the heater 500. The temperature of the heater 500 at this same location or area should be substantially equal. Multiple temperature sensors 110 arranged in this manner can be used for mutual calibration. Similarly, the temperature detection unit 100 includes at least two temperature sensors 110 for measuring the temperature of different locations or areas of the heater 500. They can be arranged in a straight line along the length extension direction of the heater 500, or in a spiral arrangement. The temperature of different positions or areas of the heater 500 should have certain differences. Multiple temperature sensors 110 set in this way can more accurately reflect the temperature distribution on the heater 500, which can be used for more accurate heating temperature control and achieve better smoke taste and flavor.

[0048] In another embodiment of the resistance detection system of the present invention, the shape of the cavity is adapted to the heater 500. See also Figure 2The heater 500 is a long, rod-shaped or needle-shaped device, and the cavity is slightly larger than the heater 500 to facilitate insertion of the heater 500 without excessive gaps. Of course, if the heater 500 has other shapes, such as a sheet, the shape of the cavity should also be adapted to match.

[0049] In another embodiment of the resistance detection system of the present invention, the preset temperature includes at least a first preset temperature and a second preset temperature. For example, the optimal heating temperature for a heated non-combustible smoke is 300°C to 330°C. The resistance value of the heater 500 increases continuously with the increase of temperature. The first preset temperature can be set to 300°C, and the second preset temperature can be set to 330°C. The control unit 400 records the first resistance value and the second resistance value of the heater 500 corresponding to this temperature. The heater 500 has a first resistance value of R1 when heated to 300℃ and a second resistance value of R2 when heated to 330℃. Clearly, R1 < R2. In actual use and control, when the resistance of the heater 500 rises to R1, it indicates that the optimal heating temperature range has been reached. Power supply should continue or be reduced to allow the temperature to continue rising. When the resistance rises to R2, it indicates that the upper temperature limit has been reached. Power supply should be reduced or stopped to allow the temperature to decrease. When the resistance falls back to R1, it indicates that the lower temperature limit has been reached. Power supply should be started or increased. Of course, if the resistance of the heater 500 continuously decreases as the temperature rises, then R1 > R2. The method for maintaining the optimal heating temperature is similar: the resistance of the heater 500 should be between R1 and R2. However, in specific control, when the resistance falls to R2, power supply needs to be reduced or stopped, and when the resistance rises to R1, power supply needs to be started or increased.

[0050] Preferably, if more target values ​​are needed in the heating control process of a heated non-combustible smoke generator for more precise temperature control, more preset temperatures T1, T2, T3, T4... and corresponding resistance values ​​R1, R2, R3, R4... can be set to form a set of discrete temperature-resistance relationships for the heater 500. Any one or two of these preset temperatures can be selected to implement temperature control using the methods described in the foregoing embodiments.

[0051] Preferably, the temperature detection unit 100 detects the temperature of the heater 500 in real time, and the resistance measurement unit 300 detects the resistance value of the heater 500 in real time. This forms a linear temperature-resistance relationship for the heater 500. The control unit 400 records the relationship between the resistance and temperature of the heater 500. The heating temperature can be determined based on the resistance value of the heater 500 at any time, achieving more flexible and diverse control.

[0052] In another embodiment of the resistance detection system of the present invention, at least two temperature sensors 110 are disposed within the cavity of the temperature detection unit 100. The temperature values ​​detected by these different temperature sensors 110 are combined or selectively used to obtain a more accurate temperature value of the heater 500. For example, if two or more temperature sensors 110 simultaneously detect the temperature of the same location or area of ​​the heater 500, and if all these temperature sensors 110 are well aligned, the detected temperatures should be substantially equal without significant deviation. However, the situation is not always ideal during the detection process. Therefore, by using an average temperature method, the error caused by this situation can be reduced to a controllable range.

[0053] For example, each heated tobacco product has its optimal heating temperature. If the heating temperature is too high, the heated tobacco product will undergo excessive thermal decomposition, releasing not only more harmful substances but also affecting the smoking experience. Conversely, if the heating temperature is too low, it will not release enough inhalable components, such as flavorings and salts, thus affecting the smoking experience. Therefore, detecting the highest and lowest temperatures of the heater 500 can serve as important references for subsequent control. Of course, the average temperature, highest temperature, and lowest temperature can also be used in combination. For example, the highest and lowest values ​​can be removed from all detected temperatures, and the average value of the remaining values ​​can be taken. Depending on the type and temperature distribution characteristics of the actual heater 500, a suitable combination of the temperatures detected by each temperature sensor 110 can be selected. The above-described methods of using the detected temperatures are merely exemplary and do not include all instances in specific usage. As long as the individual or combined use of these detected temperatures does not contradict each other, they should be considered within the scope of this specification.

[0054] Preferably, at least two temperature sensors 110 are provided inside the cavity. If two temperature sensors 110 detect temperature values ​​at different locations of the heater 500, there will be a roughly fixed temperature difference between them. If two temperature sensors 110 detect temperature values ​​at the same location of the heater 500, the detected temperatures should be approximately equal. When the positions of two temperature sensors 110 are fixed, the temperature difference they detect in the heater 500 is also roughly fixed. Therefore, a threshold value can be determined based on the actual situation. If the temperature difference detected by two temperature sensors 110 is less than this threshold value, it indicates that the detection is correct, and the resistance value of the heater 500 at this temperature is recorded; otherwise, it indicates that the detection is incorrect, and the detection is repeated.

[0055] In another embodiment of the resistance detection system of the present invention, the resistance detection system includes more than two temperature detection units 100 and more than two resistance measurement units 300, which can share the same control unit 400 or be connected to a control unit 400 respectively, thus forming a situation where multiple detection subsystems operate in parallel. This configuration can enable the simultaneous connection of multiple heaters 500 to achieve batch detection of multiple heaters 500.

[0056] In another embodiment of the resistance detection system of the present invention, the temperature sensor 110 is an infrared temperature sensor. Its sensitive element is not in contact with the heater 500 being measured, making it a non-contact temperature sensor, also known as an infrared thermometer. This type of temperature sensor can be used to measure the surface temperature of moving objects, small targets, and objects with small heat capacity or rapidly changing (transient) temperatures. It can also be used to measure the temperature distribution of a temperature field. In this embodiment, the temperature change range of the heater is within the range of the infrared temperature sensor. The range is the temperature measurement range; when selecting an infrared temperature sensor, its range must be considered. Only by selecting a suitable range can measurement be performed. Furthermore, attention should be paid to the type and size of the sensor to achieve accurate temperature measurement. For example, the distance coefficient D:S of the infrared temperature sensor is an important parameter of the infrared probe, that is, the ratio of the distance D between the thermometer probe and the target to the diameter S of the target being measured. Given a fixed target size, a suitable distance range between the probe and the target can be determined. Simultaneously, the sensor size should not be too large or too small, especially for fixed-focal-length temperature sensors. The focal point of the optical system is the position of minimum spot size; the spot size increases both near and far from the focal point. The sensor size must be selected based on the size of the heater 500 to avoid a measurement spot larger than the sensor size. When selecting an infrared temperature sensor, it is also necessary to determine the optical resolution, wavelength range, response time, and signal processing functions. For example, the material of the object being measured determines the wavelength range for measurement. Furthermore, the effects of factors such as temperature, atmosphere, contamination, and interference on performance indicators need to be carefully considered to determine correction methods to increase measurement accuracy. Preferably, when using a resistance detection system, the heater 500 is positioned at the optimal measurement location of the infrared temperature sensor 110. For example, when using an infrared temperature sensor with an optically assisted positioning unit, the optimal measurement location is preferably its minimum spot size. To accurately measure temperature at distances close to and far from the focal point, the target size should be larger than the spot size at the focal point, achieving the most accurate measurement of the heater 500 surface temperature.

[0057] In another embodiment of the resistance detection system of the present invention, the temperature detection unit 100 detects the temperature of the cylindrical heater, for example, by directly measuring the temperature of the outer wall of the cylindrical heater, or by aligning the temperature detection unit 100 with the inner wall of the cylindrical heater, thus completing the detection of the temperature in the receiving cavity. Simultaneously, the voltage and current values ​​connected to the cylindrical heater are measured and converted into a resistance value. The closer the voltage and current values ​​are to the actual values, the more accurate the measured resistance value. The specific resistance measurement process and the operation of the control unit 400 are the same as in the aforementioned embodiments and will not be repeated here.

[0058] In another embodiment of the resistance detection system of the present invention, a fixing unit 510 is further included to fix the heater 500, ensuring that the distance d between it and the temperature detection unit 100 cannot be arbitrarily shifted, thereby guaranteeing the accuracy and stability of the measurement. Preferably, the resistance detection system further includes a position adjustment unit (not shown in the figure), connected to the fixing unit 510 and / or the temperature detection unit 100, to adjust the relative position of the heater 500 and the temperature sensor 110, specifically adjusting the distance d between the heater 500 and the temperature sensor 110 to the focal length of the temperature sensor 110, so that the heater 500 is located at the optimal measurement position of the temperature sensor 110. The present invention also provides a resistance detection method, reflecting the working process of the aforementioned resistance detection system, including the following steps:

[0059] S1. Fix the distance between the heater and the temperature detection unit so that the heater is within the detection range of at least one temperature sensor installed in the temperature detection unit;

[0060] S2. Supply electrical energy to the heater to raise its temperature, and detect the temperature and resistance value of the heater;

[0061] S3. When the heater reaches the preset temperature, record the resistance value of the heater at this temperature.

[0062] Example 1

[0063] See Figure 1 and Figure 2 In this embodiment, the resistance detection method detects an independent heater 500 that is not connected to a control board. The resistance detection system includes a temperature detection unit 100, a power supply 200, a resistance measurement unit 300, and a control unit 400. The detailed process is as follows:

[0064] 1) Fix the heater 500, for example, use the fixing unit 510 to limit the distance d between the heater 500 and the temperature detection unit 100 to a suitable range. Preferably, the heater 500 is located at the smallest spot of the infrared temperature sensor 110. Connect the leads of the heater 500 to the positive and negative terminals of the power supply 200 input port. The resistance measuring unit 300 retrieves the power supply data of the power supply 200 to the heater 500. Therefore, the detection of the heater 500 by the resistance measuring unit 300 also forms a complete circuit.

[0065] 2) Turn on the switch to supply electrical energy to the heater 500, causing it to heat up. The temperature detection unit 100 and the resistance measurement unit 300 start working simultaneously to detect the temperature and resistance value of the heater 500.

[0066] 3) When the temperature detection unit 100 detects that the temperature of the heater 500 has reached the preset temperature, it sends a signal to the control unit 400. The control unit 400 immediately retrieves and records the resistance value measured by the resistance measurement unit 300. Preferably, the resistance detection system also includes a flash memory, and the detected resistance value is directly written into the flash memory.

[0067] 4) During subsequent installation, this resistance value will be written into the control board of the smoking device for use as a temperature control parameter during subsequent use. During subsequent use, as long as the resistance value of heater 500 reaches the above-mentioned temperature control parameter, it indicates that heater 500 has reached the required target temperature, and the power supply mode can be adjusted, such as adjusting the power or stopping the power supply.

[0068] Example 2

[0069] See Figure 1 and Figure 3 The resistance detection method of this embodiment detects a semi-finished electric heating appliance, which is a heater 500 connected to a control board 600. The resistance detection system includes a temperature detection unit 100, a resistance measurement unit 300, a control unit 400, and a power supply 200. The resistance measurement unit 300 is integrated into the control board 600 which is electrically connected to the heater 500.

[0070] The detailed process is as follows:

[0071] 1) Fix the semi-finished electric heating appliance. For example, use a fixing unit 510 to limit the distance d between the heater 500 and the temperature detection unit 100 to a suitable range. Preferably, the heater 500 is located exactly at the smallest spot of the infrared temperature sensor 110. Connect the leads of the control board 600 to the positive and negative terminals of the power input port 200. The control board 600 and the control unit 400 are connected via a serial port 610 such as USB. The resistance measurement unit 300 retrieves the power supply data to the heater 500. Therefore, the detection of the heater 500 by the resistance measurement unit 300 also forms a complete circuit.

[0072] 2) Turn on the switch 620 on the control board 600 to supply electrical energy to the heater 500, so that it heats up. The temperature detection unit 100 and the resistance measurement unit 300 start working at the same time to detect the temperature and resistance value of the heater 500.

[0073] 3) When the temperature detection unit 100 detects that the temperature of the heater 500 has reached the preset temperature, it sends a signal to the control unit 400. The control unit 400 immediately retrieves and records the resistance value measured by the resistance measurement unit 300. Preferably, the control board 600 includes a storage unit (not shown in the figure), and the control unit 400 writes the resistance value of the heater 500 at the preset temperature into the storage unit.

[0074] 4) During subsequent installation, connect the battery to the control board 600 and add the casing. The stored resistance value can be directly used as the temperature control parameter during subsequent use of the smoking device. During subsequent use, as long as the resistance value of the heater 500 reaches the above-mentioned temperature control parameter, it indicates that the heater 500 has reached the required target temperature, and the power supply mode can be adjusted, such as adjusting the power or stopping the power supply.

[0075] Example 3

[0076] See Figure 1 and Figure 4 The resistance detection method of this embodiment detects a finished electric heating appliance, which includes a heater 500, a control board 600, a battery, and a housing 700. The resistance detection system includes a temperature detection unit 100, a resistance measurement unit 300, a control unit 400, and a power supply 200. The resistance measurement unit 300 is integrated into the control board 600, which is electrically connected to the heater 500. The power supply 200 directly uses the battery of the finished electric heating appliance. The control unit 400 includes a first control subunit and a second control subunit, which are communicatively connected. The first control subunit is integrated into the control board 600, and the second control subunit is communicatively connected to the temperature detection unit 100.

[0077] The detailed process is as follows:

[0078] 1) Fix the heater 500, for example, by using a fixing unit 510 to limit the distance d between the heater 500 and the temperature detection unit 100 to a suitable range. Preferably, the heater 500 is located exactly at the smallest light spot of the infrared temperature sensor 110, and there is no obstruction between the heater 500 and the infrared temperature sensor 110. The control board 600 of the finished electric heating appliance has its leads connected to the positive and negative terminals of the power input port 200. The control board 600 is connected to the control unit 400 via a serial port 610 such as USB. The resistance measurement unit 300 retrieves the power supply data to the heater 500. Therefore, the detection of the heater 500 by the resistance measurement unit 300 also forms a complete circuit.

[0079] 2) Turn on the switch 620 on the control board 600 to supply electrical energy to the heater 500, so that it heats up. The temperature detection unit 100 and the resistance measurement unit 300 start working at the same time to detect the temperature and resistance value of the heater 500.

[0080] 3) When the temperature detection unit 100 detects that the heater 500 has reached a preset temperature, the second control subunit sends a signal to the first control subunit, and the first control subunit records the resistance value of the heater 500 at this temperature. Preferably, the control board 600 includes a storage unit, and the control unit 400 writes the resistance value of the heater 500 at the preset temperature into the storage unit.

[0081] 4) The stored resistance value can be directly used as the temperature control parameter during subsequent use of the smoking device. During subsequent use, as long as the resistance value of the heater 500 reaches the above-mentioned temperature control parameter, it indicates that the heater 500 has reached the required target temperature, and the power supply mode can be adjusted, such as adjusting the power or stopping the power supply.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A resistance detection system, characterized in that, include: A temperature detection unit, externally mounted on a finished or semi-finished electric heating appliance or heater, includes a non-contact temperature sensor for detecting the temperature of the heater or said heater in the finished or semi-finished electric heating appliance; A power source for supplying electrical energy to the heater; A resistance measuring unit is electrically connected to the heater to measure its resistance value; The control unit is connected to the temperature detection unit and the resistance measurement unit respectively. The heater heats up under the power supply. When the temperature detection unit detects that the heater has reached the preset temperature, it records the resistance value of the heater at this temperature. The resistance value is used for subsequent heating control. The temperature detection unit is used to measure the temperature at the same location or area of ​​the heater, or to measure the temperature at different locations or areas of the heater.

2. The resistance detection system according to claim 1, characterized in that, The resistance measurement unit is integrated into a control board that is electrically connected to the heater.

3. The resistance detection system according to claim 2, characterized in that, The control board includes a storage unit, and the control unit writes the resistance value of the heater when it reaches a preset temperature into the storage unit.

4. The resistance detection system according to claim 3, characterized in that, The control unit includes a first control subunit and a second control subunit. The first control subunit and the second control subunit are communicatively connected. The first control subunit is integrated into the control board, and the second control subunit is communicatively connected to the temperature detection unit. When the temperature detection unit detects that the heater has reached a preset temperature, the second control subunit sends a signal to the first control subunit, and the first control subunit records the resistance value of the heater at this temperature.

5. The resistance detection system according to claim 4, characterized in that, The power supply is electrically connected to the control board, and the control board, the heater, and the power supply constitute at least a part of the finished or semi-finished product of the electric heating appliance.

6. The resistance detection system according to claim 1, characterized in that, The temperature detection unit includes a temperature sensor for repeatedly measuring the temperature of the same location or area of ​​the heater.

7. The resistance detection system according to claim 1, characterized in that, The temperature detection unit includes a temperature sensor for repeatedly measuring the temperature at different locations or areas of the heater.

8. The resistance detection system according to claim 1, characterized in that, The temperature detection unit includes a temperature sensor, and the preset temperature is at least one of the average temperature, the highest temperature, and the lowest temperature detected by the temperature sensor multiple times.

9. The resistance detection system according to claim 1, characterized in that, The temperature detection unit includes a temperature sensor. If the temperature difference detected by the temperature sensor multiple times is less than a threshold, the resistance value of the heater at this temperature is recorded; otherwise, it indicates a detection error, and the detection is repeated.

10. The resistance detection system according to claim 1, characterized in that, The temperature sensor is an infrared temperature sensor, and the temperature variation range of the heater is within the range of the infrared temperature sensor.

11. The resistance detection system according to claim 10, characterized in that, The heater is positioned at the optimal measurement location of the infrared temperature sensor.

12. The resistance detection system according to claim 1, characterized in that, It also includes a fixing unit for fixing the heater.

13. The resistance detection system according to claim 12, characterized in that, It also includes a position adjustment unit, connected to the fixing unit and / or the temperature detection unit, to adjust the relative position of the heater and the temperature sensor.

14. The resistance detection system according to claim 1, characterized in that, The preset temperature includes at least a first preset temperature and a second preset temperature, and the control unit records the first resistance value and the second resistance value of the heater corresponding to this temperature, respectively.

15. The resistance detection system according to claim 1, characterized in that, The temperature detection unit detects the temperature of the heater in real time, the resistance measurement unit detects the resistance value of the heater in real time, and the control unit records the relationship between the resistance and temperature of the heater.

16. The resistance detection system according to claim 1, characterized in that, The resistance detection system contains more than two temperature detection units and two resistance measurement units.

17. The resistance detection system according to claim 1, characterized in that, The heater is an insertion heater, used to insert into the aerosol generating article to heat the aerosol generating substance therein to produce aerosol.

18. The resistance detection system according to claim 1, characterized in that, The heater is a cylindrical heater used to contain and heat the aerosol-generated product.

19. A resistance detection method, characterized in that, Includes the following steps: S1. Fix the distance between the finished or semi-finished electric heating appliance or heater and the temperature detection unit, so that the heater is within the detection range of the non-contact temperature sensor installed in the temperature detection unit; S2. Supply electrical energy to the heater to raise its temperature, and detect the temperature and resistance value of the heater; S3. When the heater reaches the preset temperature, record the resistance value of the heater at this temperature. The resistance value is used for subsequent heating control.

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