CN117918590A - Dry combustion method and device for atomizer, controller and atomization equipment - Google Patents

Abstract

The application relates to a dry combustion method and device for an atomizer, a controller and atomization equipment. The method comprises the following steps: at each falling edge moment of a pulse width modulation signal, heating voltage in a preset time period is obtained, the pulse width modulation signal is used for driving the atomizer to heat the aerosol-generating substrate, and the duration of the preset time period is smaller than the low-level duration of the pulse width modulation signal; determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period; and under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information, judging that the atomizer is in a dry-burning state. By adopting the method, whether the atomizer contains aerosol generating matrixes or not can be accurately detected, so that dry burning of the atomizing equipment is accurately prevented.

Description

Dry combustion method and device for atomizer, controller and atomization equipment

Technical Field

The application relates to the technical field of atomizer dry combustion detection, in particular to a dry combustion detection method and device of an atomizer, a controller and an atomization device.

Background

With the development of atomizing devices, the safety use of the atomizing devices is particularly important. The atomizing device cannot distinguish whether the atomizer contains aerosol generating substrates or not when atomizing, if no aerosol generating substrates exist, the user sucking temperature can reach more than 800 ℃, and at the moment, substances which are unfavorable for health can be generated, even explosion is caused, so that the human health is endangered.

In the prior art, whether an aerosol generating substrate is contained is generally judged by self-perception of a user, and if the aerosol generating substrate is sucked, the suction is stopped after the user is slightly burned, so that the experience is poor; or a temperature sensor is added, and whether the atomizer contains aerosol generating substrate is judged through temperature detection.

However, the above methods cannot accurately detect whether the aerosol-generating substrate is contained in the atomizer, thereby accurately preventing dry combustion of the atomizing device.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a dry-fire detection method and apparatus for an atomizer, a controller, and an atomizer that can accurately detect whether an aerosol-generating substrate is contained in the atomizer, thereby accurately preventing dry-fire of the atomizer.

In a first aspect, the present application provides a method for detecting dry combustion of an atomizer, the method comprising:

At each falling edge moment of a pulse width modulation signal, heating voltage in a preset time period is obtained, the pulse width modulation signal is used for driving the atomizer to heat the aerosol-generating substrate, and the duration of the preset time period is smaller than the low-level duration of the pulse width modulation signal;

determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period;

and under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information, judging that the atomizer is in a dry-burning state.

In one embodiment, when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

Under the condition that the resistance change rate curve of the atomizer is not matched with the preset resistance change rate curve, the atomizer is judged to be in a dry burning state, and the resistance change rate curve is used for representing the condition that the resistance change rate changes along with time.

In one embodiment, the heating process includes a rapid temperature rise stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

if the integral value of the resistance value of the atomizer in the rapid temperature rise stage is larger than the reference integral value and/or the resistance value change rate of the resistance value of the atomizer in the rapid temperature rise stage is larger than the reference change rate, judging that the atomizer is in a dry burning state;

the reference integral value is the integral of the preset change resistance value in the rapid temperature rise stage, and the reference change rate is a resistance value change rate determined based on the preset change resistance value in the rapid temperature rise stage.

In one embodiment, when the resistance change information of the atomizer is not matched with the preset change information, determining that the atomizer is in a dry-heating state includes:

And under the condition that the target resistance change rate is larger than the preset resistance change rate, judging that the atomizer is in a dry burning state, wherein the target resistance change rate is a change rate determined based on the heating voltage corresponding to the first pulse width modulation signal and the heating voltage corresponding to the last pulse width modulation signal.

In one embodiment, the heating process includes a fast temperature rise stage and a slow temperature rise stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

if the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate, and the resistance change amount in the slow temperature rise stage is larger than the reference change amount, the atomizer is judged to be in a dry burning state, and the reference change amount is a resistance change amount determined based on the preset change resistance in the slow temperature rise stage.

In one embodiment, the heating process includes a fast temperature rise stage and a slow temperature rise stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

Under the condition that the heating voltage obtained in the target stage has abrupt change, if the integral value of the resistance value of the atomizer in the target stage is larger than the reference integral value, judging that the atomizer is in a dry-burning state; the reference integral value is the integral of the preset change resistance value in a target stage, and the target stage comprises a rapid temperature rise stage or a rapid temperature rise stage and a slow temperature rise stage.

In one embodiment, the heating process includes a fast temperature rise stage, a slow temperature rise stage, and a constant temperature heating stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry heating state includes:

if the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate, and the resistance change amounts of the atomizer in the slow temperature rise stage and the constant temperature heating stage are both larger than the reference change amount of the atomizer in the stage, the atomizer is judged to be in a dry burning state, and the reference change amount is a resistance change amount determined based on the preset change resistance of the atomizer in the stage.

In a second aspect, the present application also provides an atomising device comprising:

An atomizer;

the detection circuit is connected with the atomizer to acquire the heating voltage of the atomizer;

and the controller is respectively connected with the detection circuit and the atomizer, is used for providing pulse width modulation signals to the atomizer so as to drive the atomizer to heat the aerosol-forming substrate, and is also used for executing the steps of the method in the embodiment.

In a third aspect, the present application also provides a dry combustion method detection device for an atomizer, the device comprising:

the sampling module is used for acquiring a heating voltage in a preset time period at each falling edge time of the pulse width modulation signal, the pulse width modulation signal is used for driving the atomizer to heat the aerosol-generating substrate, and the duration of the preset time period is smaller than the low-level duration of the pulse width modulation signal;

The current resistance change information determining module is used for determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period;

and the dry combustion judgment module is used for judging that the atomizer is in a dry combustion state under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information.

In a fourth aspect, the present application also provides a controller comprising a memory storing a computer program and a processor implementing the steps of the method in the above embodiments when the processor executes the computer program.

The dry combustion method, the device, the controller and the atomizing equipment for the atomizer at least comprise the following beneficial effects:

the heating voltage in a preset time period is obtained at each falling edge moment of the pulse width modulation signal, so that the heating state of the atomizer can be monitored in real time, the heating voltage is collected for a period of time after the falling edge moment, and the resistance value obtained through calculation can reflect the current resistance value change condition more timely, and therefore, the dry burning phenomenon can be found and processed timely, and further damage to the atomizer is avoided. And secondly, by comparing the current resistance change information with the preset resistance change information, whether the atomizer is in a dry burning state or not can be accurately judged, so that misjudgment or missed judgment is avoided, and the accuracy of dry burning judgment is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is an application environment diagram of a dry combustion method of a nebulizer in one embodiment;

FIG. 2 is a flow chart of a method of dry combustion detection of a nebulizer in one embodiment;

FIG. 3 is a schematic diagram of pulse width modulated signal waveforms in one embodiment;

FIG. 4 is a graph of resistance change at the time of a falling edge and at the time of a rising edge in one embodiment;

FIG. 5 is a graph of resistance versus time for one embodiment of a atomizer having different aerosol substrate contents and the same heating power;

FIG. 6 is a graph showing the rate of change of resistance of various heater materials in the atomizer during oil-free heating and during oil-free heating in accordance with one embodiment;

FIG. 7 is a graph of resistance versus time for a heating wire made of iron-chromium-aluminum, having a heating power of 6w and a heating time of 1.33 seconds in an atomizer according to an embodiment;

FIG. 8 is a block diagram of a dry heat detection apparatus of a atomizer according to an embodiment;

fig. 9 is an internal structural diagram of a computer device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The dry combustion method of the atomizer provided by the embodiment of the application can be applied to the atomizing equipment shown in fig. 1. The atomization device includes an airflow sensing circuit 2, a controller 4, a detection circuit 6, an atomizer 8, a heating control circuit 10 and an energy storage power supply 12, and the specific connection relationship thereof can be shown in fig. 1, and it is not described herein again, and it is to be noted that the atomizer includes a heating wire and a holding cavity for holding an aerosol generating substrate. The controller 4 obtains a heating voltage within a preset time period through the detection circuit 6 at each falling edge moment of the pulse width modulation signal, wherein the pulse width modulation signal is used for driving the atomizer 8 to heat the aerosol-generating substrate, and the duration of the preset time period is smaller than the low level duration of the pulse width modulation signal; determining current resistance change information of the atomizer 8 in the heating process according to the heating voltage in each preset time period; the controller 4 determines that the atomizer 8 is in a dry-combustion state when the current resistance change information of the atomizer 8 is not matched with the preset resistance change information.

In an exemplary embodiment, as shown in fig. 2, a method for detecting dry combustion of an atomizer is provided, and the method is applied to the controller 4 in fig. 1 for illustration, and includes the following steps 202 to 206. Wherein:

S202, at each falling edge time of a pulse width modulation signal, a heating voltage in a preset time period is obtained, the pulse width modulation signal is used for driving the atomizer to heat the aerosol generating substrate, and the duration of the preset time period is smaller than the low level duration of the pulse width modulation signal.

S204, determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period.

As shown in fig. 1, the pulse width modulation signal may refer to an electrical signal output to the heating control circuit by the controller after the air flow sensing circuit senses the air flow generated when the user performs the pumping action, where the pulse width modulation signal is used to control the on-off of the loop between the energy storage power supply and the atomizer, so as to heat the atomizer. The falling edge time refers to the instant when the pulse width modulation signal changes from the high level to the low level. The preset time period may refer to a period of time beginning at each falling edge of the pulse width modulation signal and lasting until the low level of the pulse width modulation signal ends, as shown in fig. 3; but may also refer to the entire period of time beginning at each falling edge of the pulse width modulated signal and continuing to the end of the low level of the pulse width modulated signal. The heating voltage refers to the voltage across the atomizer measured during the preset time period, and the voltage is used for representing the heating state of the atomizer, such as the temperature of the atomizer, the resistance change of the atomizer, and the like. The resistance change information may refer to information such as a current resistance change speed, a resistance change rate, a resistance change amount and the like of the atomizer, wherein it is to be noted that the resistance change information may also refer to information such as a resistance change speed, a resistance change rate, a resistance change amount and the like after normalization processing.

Illustratively, as shown in fig. 4, the solid line is a resistance value change curve calculated from the heating voltage acquired a period of time before the rising edge timing, and the broken line is a resistance value change curve calculated from the heating voltage acquired a period of time after the falling edge timing. As can be seen from fig. 4, the resistance calculated for a period of time before the rising edge time is smaller than the resistance calculated for a period of time after the falling edge time, so that it can be seen that the current resistance change condition can be reflected more timely by collecting the heating voltage and calculating the resistance at one end of time after the falling edge time, and the heating voltage is collected for a period of time before the rising edge time and calculating the resistance. For the implementation manner of acquiring the heating voltage in a preset time period at each falling edge time of the pulse width modulation signal, sampling can be directly realized through a detection circuit connected with the atomizer, for example, sampling can be realized by setting the sampling frequency to be 100Hz, and adopting a sampling ADC (analog-digital converter) with the sampling precision of 12 bits (namely, the sampling resolution is 0.001V), the sampling speed of more than 1MHz and the conversion time of 68 microseconds, so that the acquisition of the heating voltage is realized, thereby ensuring that the sampling of the heating voltage is completed in a very short time, avoiding lower heating voltage and lower calculated resistance value caused by too long sampling time, and avoiding interference with normal heating of the atomizer.

In addition, if sampling is performed in the high-level heating period, the heating control circuit is required to turn off the power supply output of the energy storage power supply to the atomizer when sampling the heating voltage, namely, the atomizer is stopped to be heated, so that the sampling in the high-level heating period can influence the heating of the atomizer, and the user experience is influenced.

S206, judging that the atomizer is in a dry-burning state under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information.

The preset resistance change information may refer to resistance change information of the atomizer in a normal heating process, including information such as a resistance change speed, a resistance change rate, a resistance change amount and the like in the normal heating process, and may be prestored in a memory in the controller.

The method includes the steps of calculating current resistance change information in a heating process according to collected heating voltage, and judging whether the atomizer is in a dry heating state or not by judging whether the current resistance change information of the atomizer is matched with preset resistance change information. For example, as shown in fig. 5, fig. 5 is a graph of resistance versus time for different contents of aerosol matrix in the atomizer when the heating wire in the atomizer is made of iron-chromium-aluminum and the heating power is 5 w; wherein, the curve X is the resistance-time curve when the atomizer is filled with aerosol matrix, the curve Y is the resistance-time curve when the atomizer is filled with a small amount of aerosol matrix, and the curve Z is the resistance-time curve when the atomizer is free of smoke oil. As can be seen from fig. 5, if the aerosol-generating substrate in the atomizer burns out, the resistance of the atomizer as a whole increases sharply, and the information such as the resistance change speed, the resistance change rate, and the resistance change amount also changes. Therefore, whether the atomizer is in a dry-burning state can be judged by comparing whether the current resistance change information is matched with the resistance change speed, the resistance change rate, the resistance change quantity and other information in the preset resistance change information. It should be noted that the above examples are only illustrative, and a person skilled in the art may adaptively adjust and set the preset resistance change information according to different heating filament materials and different heating powers, so as to adapt to the dry combustion judgment requirements under the scene without passing through the heating filament materials and the different heating powers.

In this embodiment, the heating voltage in the preset time period is obtained at each falling edge time of the pulse width modulation signal, so that the heating state of the atomizer can be monitored in real time, and the current resistance change condition can be reflected more timely by collecting the heating voltage and calculating the resistance value in a period of time after the falling edge time, so that the dry burning phenomenon can be found and processed timely, and further damage to the atomizer is avoided. And secondly, by comparing the current resistance change information with the preset resistance change information, whether the atomizer is in a dry burning state or not can be accurately judged, so that misjudgment or missed judgment is avoided, and the accuracy of dry burning judgment is improved.

In an exemplary embodiment, as shown in fig. 5, in a case where the current resistance change information of the atomizer does not match the preset resistance change information, determining that the atomizer is in a dry-burned state includes:

Under the condition that the current resistance change rate curve of the atomizer is not matched with the preset resistance change rate curve, the atomizer is judged to be in a dry burning state, and the resistance change rate curve is used for representing the condition that the resistance change rate changes along with time.

The preset resistance change rate curve may refer to a resistance change rate curve of the atomizer in a normal heating process, and it should be noted that the resistance change amount may be calculated by the following formula:

E＝R_n-R₀

wherein E is the resistance change, R ₀ is the resistance of the heating wire material in the atomizer when the heating wire material is not heated, and R _n is the resistance at the time of n after the heating wire material is electrified.

The resistance change rate can be calculated by the following formula:

wherein B is the resistance change rate.

Illustratively, as described above, by acquiring the heating voltage of the atomizer, not only the current resistance change speed, the resistance change rate, the resistance change amount, and the like of the atomizer can be determined, but also the current resistance change rate curve of the atomizer can be determined. After determining the current resistance change rate curve of the atomizer, the matching degree of the current resistance change rate curve and the preset resistance change rate curve can be compared in a mode such as image recognition, for example, as shown in fig. 6, fig. 6 is a resistance change rate curve of multiple heating wire materials in oil-free heating and oil-free heating, and it can be seen from the graph that before 200ms, the resistance change rate curve in oil-free heating and the resistance change rate curve in oil-free heating basically overlap, and after 200ms, the resistance change rate curve in oil-free heating and the resistance change rate curve in oil-free heating basically do not overlap, and whether the atomizer is in a dry-burned state can be obtained by judging the matching degree of the resistance change rate curve in oil-free heating and the resistance change rate curve in oil-free heating (such as the overlapping degree of the resistance change rate curve in oil-free heating and the resistance change rate curve in oil-free heating). For example, if the degree of overlap between the resistance change rate curve in the oil-free heating and the resistance change rate curve in the oil-free heating is less than 70%, it is determined that the atomizer is in the dry-combustion state at this time. It should be noted that the foregoing examples are only illustrative, and the specific overlapping degree setting may be adaptively adjusted according to the dry combustion judgment accuracy requirement.

In this embodiment, by comparing the matching degree of the current resistance change rate curve and the preset resistance change rate curve of the atomizer, the heating state of the atomizer can be more intuitively known, and erroneous judgment or missed judgment is avoided.

In an exemplary embodiment, the heating process includes a rapid temperature rise stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

if the integral value of the resistance value of the atomizer in the rapid temperature rise stage is larger than the reference integral value and/or the resistance value change rate of the resistance value of the atomizer in the rapid temperature rise stage is larger than the reference change rate, judging that the atomizer is in a dry burning state; the reference integral value is the integral of the preset change resistance value in the rapid temperature rise stage, and the reference change rate is a resistance value change rate determined based on the preset change resistance value in the rapid temperature rise stage.

In an exemplary embodiment, in order to timely find whether the atomizer is in a dry-heating state in a rapid temperature rise stage of the atomizer (i.e., a heating initial stage of the atomizer), so as to timely control the atomizer in the dry-heating state to stop heating, by judging whether an integral value of the rapid temperature rise stage is larger than a reference integral value, if the integral value is larger than the reference integral value, it is judged that the atomizer is in the dry-heating state at this time, and by comparing the integral values, the area under the curves is actually compared, and compared with the slope of the two resistance change curves, the integral value can be compared in a manner of comparing the integral values when the slope is slightly changed, so that whether the atomizer is in the dry-heating state can be judged more accurately and rapidly. For example, as shown in fig. 7, fig. 7 is a graph of resistance versus time when the heating wire in the atomizer is made of iron-chromium-aluminum, the heating power is 6w, and the heating time is 1.33 seconds, and as can be seen from fig. 7, the change in resistance in the overall heating process is only about 15 milliohms, and the change in slope caused by the change is extremely small.

And secondly, whether the atomizer is in a dry-burning state can be judged by comparing whether the resistance change rate of the atomizer in the rapid temperature rise stage is larger than the reference change rate. As shown in fig. 6, the resistance change rate is used as a factor for determining whether the atomizer is in a dry-combustion state, and the resistance change rate can reflect the operating state of the atomizer in real time, compared with the case where only a single parameter such as a resistance or a resistance change amount is used. During heating, if the rate of change of the resistance value suddenly increases, this may mean that an abnormal condition such as dry combustion occurs inside the atomizer. The change rate of the resistance value can reflect the state change of the atomizer more quickly, so that the potential dry burning problem can be found earlier by using the change rate of the resistance value, and a time advantage is provided for timely taking measures. The resistance change is calculated based on the difference value of the two time points, so that the advantages of dynamic monitoring and early warning are not achieved, and meanwhile, the state change of the atomizer cannot be reflected in real time like the resistance change rate.

In addition, the integral value and the resistance change rate can be combined simultaneously to judge whether the atomizer is in a dry burning state. The method comprises the steps of simultaneously judging whether the integral value of the resistance value of the atomizer is larger than a reference integral value or not, and judging that the resistance value change rate of the atomizer in a rapid temperature rise stage is larger than the reference change rate, wherein the atomizer is in a dry burning state only when the integral value and the reference change rate are in accordance with each other, so that the accuracy of a judgment result is further ensured.

In the embodiment, the working state of the atomizer can be monitored in real time through comparison of the integral value and the resistance change rate, and the potential dry burning problem can be found earlier, so that measures can be taken in time, and equipment damage or safety problems can be avoided. As the resistance change rate is a relatively dynamic parameter, compared with the method which only uses single parameters such as resistance or resistance change quantity, the resistance change rate can more accurately reflect the working state of the atomizer so as to reduce misjudgment caused by improper setting of static parameters.

In an exemplary embodiment, in a case that the resistance change information of the atomizer does not match the preset change information, determining that the atomizer is in a dry-fire state includes:

And under the condition that the target resistance change rate is larger than the preset resistance change rate, judging that the atomizer is in a dry burning state, wherein the target resistance change rate is a change rate determined based on the heating voltage corresponding to the first pulse width modulation signal and the heating voltage corresponding to the last pulse width modulation signal.

The target resistance change rate may specifically refer to a resistance change rate in the whole heating process of the heating atomizer, and the preset resistance change rate may specifically refer to a resistance change rate in the whole normal heating process of the atomizer.

For example, when the target resistance change rate is greater than the preset resistance change rate, it is determined that the atomizer is in the dry-combustion state. For example, as shown in fig. 6, at the end of heating, the resistance change rate of the curve 1 is significantly larger than that of the curve 2, and at this time, it can be determined that the atomizer is in the dry-burned state.

In this embodiment, by determining whether the resistance change rate of the whole heating process is greater than the preset resistance change rate, the material of the heating wire with smaller resistance change rate in the heating process is adapted, so as to avoid erroneous judgment and missed judgment caused by smaller resistance change rate in the heating process.

In an exemplary embodiment, the heating process includes a fast temperature rise stage and a slow temperature rise stage, and determining that the atomizer is in a dry-fire state when the current resistance change information of the atomizer is not matched with the preset resistance change information includes:

If the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate, and if the resistance change amount in the slow temperature rise stage is larger than the reference change amount, the atomizer is judged to be in a dry burning state, the reference change amount is a resistance change amount determined based on the preset change resistance in the slow temperature rise stage, and the reference change rate is a resistance change rate determined based on the preset change resistance in the fast temperature rise stage.

Illustratively, atomizers typically experience a rapid temperature rise phase and a slow temperature rise phase during heating. The rapid temperature rise stage is the initial heating stage, and at the moment, aerosol matrixes in the atomizer start to be heated and evaporated to generate gas, so that the temperature is rapidly increased, and the resistance value is rapidly changed. The slow temperature rise stage is the heating later stage, at this time, the aerosol matrix in the atomizer is basically evaporated, the temperature rise speed is gradually slowed down, and the change of the resistance value is correspondingly slowed down. Therefore, the working state of the atomizer can be more comprehensively known by considering the resistance change conditions of the rapid temperature rise stage and the slow temperature rise stage at the same time, and the judgment accuracy is improved. Specifically, if only the rate of change of the resistance value in the rapid temperature rise phase is considered, the problem in the slow temperature rise phase may be ignored, resulting in erroneous or missed judgment. If only the resistance change in the slow temperature rise stage is considered, the dry combustion condition may not be accurately reflected because the change is too small, resulting in erroneous judgment or missed judgment. For example, consider only the rate of change of resistance in the rapid temperature rise phase: if the atomizer works normally, the resistance change rate in the rapid temperature rise stage is 5 omega/s. But if for some reason (such as dry combustion) the rate of change of the resistance value of the atomizer suddenly increases to 10 q/s. In this case, if we consider only the resistance change rate in the rapid temperature rise phase, we can determine that the atomizer is in the dry combustion state when the resistance change rate is greater than 5 Ω/s. However, if the atomizer is in a slow temperature rise phase after a fast temperature rise phase, the rate of change of the resistance is still high (for example, kept at 5 Ω/s), but due to the slow rate of change, we may misjudge as a normal operation state, which may lead to missed judgment. Only the resistance change amount in the slow temperature rise stage is considered: if only the amount of change in the resistance value at the slow temperature rise stage is considered, for example, the amount of change in the resistance value at this stage is 1Ω in normal operation. When the resistance change amount at this stage suddenly increases to 2Ω due to dry combustion or the like, we can determine that the atomizer is in the dry combustion state. However, there is a problem in that since the amount of change in the resistance value in the slow temperature rise stage is generally small (for example, 1Ω), even a small change may cause erroneous judgment. For example, if the resistance change amount in the slow temperature rise stage reaches 1.5Ω by accident for some reason (such as temperature fluctuation or measurement error), this may lead to erroneous judgment as the dry combustion state.

In this embodiment, in order to more accurately determine whether the atomizer is in a dry-burning state, the resistance change rate in the fast temperature rise stage and the resistance change amount in the slow temperature rise stage are considered at the same time, so as to avoid the problem of erroneous determination or missed determination, and improve the accuracy and robustness of the determination.

In an exemplary embodiment, the heating process includes a fast temperature rise stage and a slow temperature rise stage, and determining that the atomizer is in a dry-fire state when the current resistance change information of the atomizer is not matched with the preset resistance change information includes:

Under the condition that the heating voltage obtained in the target stage has abrupt change, if the integral value of the resistance value of the atomizer in the target stage is larger than the reference integral value, judging that the atomizer is in a dry-burning state; the reference integral value is the integral of the preset change resistance value in a target stage, and the target stage comprises a rapid temperature rise stage or a rapid temperature rise stage and a slow temperature rise stage.

As described above, the current resistance change information of the atomizer is determined by calculating the obtained heating voltage, and the fact that the heating voltage has abrupt change may mean that the heating voltage difference value collected at the front and rear time points exceeds a preset difference value, or that a curve fitted by a plurality of heating voltages does not match (e.g., the two curves do not overlap) a reference linear voltage change curve, or that the heating voltage value of some sampling points on the curve exceeds an allowable deviation range of corresponding sampling points on the reference linear voltage change curve. The reference linear voltage change curve may refer to a change curve of a heating voltage of the atomizer when the atomizer generates dry heating.

The method includes the steps that when the heating voltage obtained in the fast temperature rise stage or the fast temperature rise stage and the slow temperature rise stage suddenly changes, the heating voltage data sampled at the moment is abnormal, and the permissible deviation range of corresponding sampling points on a heating voltage change curve of the sampling atomizer in dry burning is far exceeded, and although the sampling resistance change rate is used for judging whether the atomizer is in dry burning or not, the problem of dry burning can be found more timely, and at the moment, whether the atomizer is in dry burning or not is still judged through the resistance change rate, so that misjudgment can be caused. Therefore, at this time, it is necessary to determine whether the atomizer is in a dry-burning state by determining whether the resistance value of the atomizer is greater than the reference integral value in the fast temperature rise stage, or in the fast temperature rise stage and the slow temperature rise stage. Compared with the mode of adopting the resistance change rate as the judgment basis, the method has the advantages that the judgment speed is low, but the integral value is adopted as the judgment basis, so that the change condition of the resistance can be smoothly considered, and the dry combustion judgment error caused by factors such as abrupt change and the like is reduced. In addition, the integral value also has translational invariance and scale invariance, so that the influence of measurement errors and other factors can be reduced to a certain extent, and the accuracy of dry combustion judgment can be improved.

In this embodiment, when there is a sudden change in the heating voltage, the integral value is used as a criterion for judging whether the atomizer is in dry combustion, so that accuracy and robustness of dry combustion judgment can be improved.

In an exemplary embodiment, the heating process includes a fast temperature rise stage, a slow temperature rise stage, and a constant temperature heating stage, and when the current resistance change information of the atomizer is not matched with the preset resistance change information, determining that the atomizer is in a dry-heating state includes:

If the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate, and the resistance change amounts of the atomizer in the slow temperature rise stage and the constant temperature heating stage are both larger than the reference change amount of the atomizer in the stage, the atomizer is judged to be in a dry burning state, the reference change amount is a resistance change amount determined based on the preset change resistance of the stage, and the reference change rate is a resistance change rate determined based on the preset change resistance of the fast temperature rise stage.

Illustratively, the constant temperature heating phase is an important phase in the heating process, in which the heating voltage has reached a steady state, and thus the rate of change of the resistance value of the atomizer should be small and should remain steady in this phase. If the variation of the resistance value of the atomizer is still large in this stage, it is indicated that the atomizer may be in a dry-burned state. Therefore, it is also necessary to determine whether the resistance change amount in the constant temperature heating stage is greater than the reference change amount, so as to determine whether the atomizer is in a dry heating state, thereby improving the accuracy of determination and avoiding the occurrence of erroneous determination or missed determination.

In this embodiment, by judging the resistance change conditions of the three stages, the working state of the atomizer can be more comprehensively known, and the accuracy of judgment is improved. In practical application, the reference change rate and the reference change amount of the three stages can be adjusted according to specific conditions so as to adapt to different atomizers and heating equipment.

In an exemplary embodiment, as shown in fig. 1, the present application also provides an atomizing device comprising an atomizer 8, a detection circuit 6, and a controller 4. The detection circuit 6 is connected with the atomizer 8 to acquire the heating voltage of the atomizer 8; the controller 4 is connected to the detection circuit 6 and the atomizer 8, respectively, the controller 4 being adapted to provide a pulse width modulated signal to the atomizer 8 for driving the atomizer 8 to heat the aerosol-forming substrate, the controller 4 being further adapted to perform the steps of the method in the above-described embodiments.

The atomization device provided by the application further comprises an airflow sensing circuit 2, a heating control circuit 10 and an energy storage power supply 12, and the atomization device in this embodiment corresponds to the embodiment of the dry-heating detection method of the atomizer, and the specific implementation and the beneficial effects thereof can be referred to the description in the above embodiment and are not repeated herein.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a dry-combustion detection device of the atomizer for realizing the dry-combustion detection method of the atomizer. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the dry combustion detection device for one or more atomizers provided below may be referred to the limitation of the dry combustion detection method for an atomizer hereinabove, and will not be described herein.

In one exemplary embodiment, as shown in fig. 8, there is provided a dry combustion method detecting apparatus of an atomizer, including: a sampling module 802, a current resistance change information determining module 804 and a dry combustion determination module 806, wherein:

the sampling module 802 is configured to obtain a heating voltage during a preset period of time at each falling edge of the pulse width modulation signal, where the pulse width modulation signal is used to drive the atomizer to heat the aerosol-generating substrate, and the duration of the preset period of time is less than the duration of the low level of the pulse width modulation signal.

The current resistance change information determining module 804 is configured to determine current resistance change information of the atomizer during heating according to the heating voltage in each preset time period.

The dry combustion method determining module 806 is configured to determine that the atomizer is in a dry combustion state when the current resistance change information of the atomizer is not matched with the preset resistance change information.

In one exemplary embodiment, the dry combustion determination module 806 includes:

The first judging unit is used for judging that the atomizer is in a dry-burning state under the condition that the current resistance change rate curve of the atomizer is not matched with the preset resistance change rate curve, and the resistance change rate curve is used for representing the condition that the resistance change rate changes along with time.

In an exemplary embodiment, the dry combustion determination module 806 further includes:

the second judging unit is used for judging that the atomizer is in a dry-burning state under the condition that the integral value of the resistance value of the atomizer in the rapid temperature rise stage is larger than a reference integral value and/or the resistance value change rate of the resistance value of the atomizer in the rapid temperature rise stage is larger than a reference change rate;

the reference integral value is the integral of the preset change resistance value in the rapid temperature rise stage, and the reference change rate is a resistance value change rate determined based on the preset change resistance value in the rapid temperature rise stage.

In an exemplary embodiment, the dry combustion determination module 806 further includes:

And the third judging unit is used for judging that the atomizer is in a dry-burning state under the condition that the target resistance change rate is larger than the preset resistance change rate, wherein the target resistance change rate is a change rate determined based on the heating voltage corresponding to the first pulse width modulation signal and the heating voltage corresponding to the last pulse width modulation signal.

In one exemplary embodiment, the dry combustion determination module 806 includes:

And the fourth judging unit is used for judging that the atomizer is in a dry burning state when the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate and the resistance change amount in the slow temperature rise stage is larger than the reference change amount, wherein the reference change amount is a resistance change amount determined based on the preset change resistance in the slow temperature rise stage, and the reference change rate is a resistance change rate determined based on the preset change resistance in the fast temperature rise stage.

In one exemplary embodiment, the dry combustion determination module 806 includes:

a fifth determination unit, configured to determine that the atomizer is in a dry-fire state if the integrated value of the resistance value of the atomizer in the target phase is greater than the reference integrated value in the case where there is a sudden change in the heating voltage acquired in the target phase; the reference integral value is the integral of the preset change resistance value in a target stage, and the target stage comprises a rapid temperature rise stage or a rapid temperature rise stage and a slow temperature rise stage.

In one exemplary embodiment, the dry combustion determination module 806 includes:

And the sixth judging unit is used for judging that the atomizer is in a dry burning state under the condition that the resistance change rate of the atomizer in the fast temperature rise stage is larger than the reference change rate and the resistance change amounts of the slow temperature rise stage and the constant temperature heating stage are both larger than the reference change amount of the stage, wherein the reference change amount is a resistance change amount determined based on the preset change resistance of the stage, and the reference change rate is a resistance change rate determined based on the preset change resistance of the fast temperature rise stage.

The above-mentioned each module in the dry combustion method detection device of the atomizer can be realized by all or part of software, hardware and the combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one exemplary embodiment, a computer device is provided, which may be a controller, the internal structure of which may be as shown in fig. 9. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external controller in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements a method of dry burn detection of a nebulizer. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by persons skilled in the art that the architecture shown in fig. 9 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In an exemplary embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor, when executing the computer program, implementing the steps in the method embodiments described above.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.

In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (10)

1. A method for dry combustion detection of an atomizer, the method comprising:

At each falling edge moment of a pulse width modulation signal, obtaining a heating voltage within a preset time period, wherein the pulse width modulation signal is used for driving an atomizer to heat an aerosol-generating substrate, and the duration of the preset time period is smaller than the low-level duration of the pulse width modulation signal;

Determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period;

And under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information, judging that the atomizer is in a dry-burning state.

2. The method according to claim 1, wherein the determining that the atomizer is in the dry-burned state if the current resistance change information of the atomizer does not match the preset resistance change information includes:

and under the condition that the current resistance change rate curve of the atomizer is not matched with the preset resistance change rate curve, judging that the atomizer is in a dry combustion state, wherein the resistance change rate curve is used for representing the condition that the resistance change rate changes along with time.

3. The method of claim 1, wherein the heating process includes a rapid temperature rise phase, and wherein determining that the atomizer is in a dry-fire state if the current resistance change information of the atomizer does not match the preset resistance change information includes:

If the integral value of the resistance value of the atomizer in the rapid temperature rise stage is larger than a reference integral value and/or the resistance value change rate of the resistance value of the atomizer in the rapid temperature rise stage is larger than a reference change rate, judging that the atomizer is in a dry combustion state;

The reference integral value is an integral of a preset change resistance value in the rapid temperature rise stage, and the reference change rate is a resistance value change rate determined based on the preset change resistance value in the rapid temperature rise stage.

4. The method according to claim 1, wherein the determining that the atomizer is in the dry-combustion state if the resistance change information of the atomizer does not match the preset change information includes:

and under the condition that the target resistance change rate is larger than the preset resistance change rate, judging that the atomizer is in a dry burning state, wherein the target resistance change rate is a change rate determined based on the heating voltage corresponding to the first pulse width modulation signal and the heating voltage corresponding to the last pulse width modulation signal.

5. The method of claim 1, wherein the heating process includes a fast temperature rise phase and a slow temperature rise phase, and wherein determining that the atomizer is in a dry-fire state if the current resistance change information of the atomizer does not match the preset resistance change information includes:

And if the resistance change rate of the atomizer in the rapid temperature rise stage is larger than the reference change rate, and if the resistance change amount in the slow temperature rise stage is larger than the reference change amount, judging that the atomizer is in a dry burning state, wherein the reference change amount is a resistance change amount determined based on the preset change resistance in the slow temperature rise stage, and the reference change rate is a resistance change rate determined based on the preset change resistance in the rapid temperature rise stage.

6. The method of claim 1, wherein the heating process includes a fast temperature rise phase and a slow temperature rise phase, and wherein determining that the atomizer is in a dry-fire state if the current resistance change information of the atomizer does not match the preset resistance change information includes:

Under the condition that the heating voltage obtained in the target stage has abrupt change, if the integral value of the resistance value of the atomizer in the target stage is larger than a reference integral value, judging that the atomizer is in a dry-heating state; the reference integral value is the integral of a preset change resistance value in the target stage, and the target stage comprises the rapid temperature rise stage or the rapid temperature rise stage and the slow temperature rise stage.

7. The method according to claim 1, wherein the heating process includes a fast temperature rise phase, a slow temperature rise phase, and a constant temperature heating phase, and the determining that the atomizer is in a dry-burned state if the current resistance change information of the atomizer is not matched with the preset resistance change information includes:

If the resistance change rate of the atomizer in the rapid temperature rise stage is larger than the reference change rate, and the resistance change amounts in the slow temperature rise stage and the constant temperature heating stage are both larger than the reference change amount in the stage, the atomizer is judged to be in a dry burning state, the reference change amount is a resistance change amount determined based on the preset change resistance in the stage, and the reference change rate is a resistance change rate determined based on the preset change resistance in the rapid temperature rise stage.

8. An atomizing apparatus, the apparatus comprising:

An atomizer;

The detection circuit is connected with the atomizer to acquire the heating voltage of the atomizer;

a controller connected to the detection circuit and the atomizer, respectively, the controller being adapted to provide a pulse width modulated signal to the atomizer to drive the atomizer to heat an aerosol-forming substrate, the controller being further adapted to perform the steps of the method according to any one of claims 1-7.

9. A dry combustion method detection device of an atomizer, the device comprising:

The sampling module is used for acquiring a heating voltage in a preset time period at each falling edge time of a pulse width modulation signal, the pulse width modulation signal is used for driving the atomizer to heat the aerosol-generating substrate, and the duration of the preset time period is smaller than the low-level duration of the pulse width modulation signal;

the current resistance change information determining module is used for determining current resistance change information of the atomizer in the heating process according to the heating voltage in each preset time period;

and the dry combustion judgment module is used for judging that the atomizer is in a dry combustion state under the condition that the current resistance change information of the atomizer is not matched with the preset resistance change information.

10. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 7 when the computer program is executed.