阅读说明：本技术 一种电子烟漏油防护装置及方法 (Electronic cigarette oil leakage protection device and method ) 是由 王善喜 于 2020-07-31 设计创作，主要内容包括：本发明创造涉及一种电子烟漏油防护装置及方法,包括气流感应器、气流感应判别电路和电热丝控制单元；气流感应器用于检测流过电子烟的气流流向和流量,并将其转换为输出电容；气流感应判别电路用于检测气流感应器的输出电容,判断该输出电容是否超过第一电容阈值和第二电容阈值,其中,仅当该输出电容超过第二电容阈值,并且该输出电容从第一电容阈值增加到第二电容阈值所花费的时间小于第一时间间隔时,判定为吸烟状态；电热丝控制单元基于所述气流感应判别电路的判别结果控制电热丝加热；其中,第一电容阈值小第二电容阈值。本发明通过电容阈值和时间间隔对吸烟、漏油状态进行准确判别,避免了漏油误判引发自燃,保障了电子烟的使用安全。(The invention relates to an electronic cigarette oil leakage protection device and a method, comprising an airflow sensor, an airflow sensing discrimination circuit and an electric heating wire control unit; the airflow sensor is used for detecting the airflow direction and the flow rate of the airflow flowing through the electronic cigarette and converting the airflow direction and the flow rate into an output capacitor; the airflow induction judging circuit is used for detecting an output capacitor of the airflow inductor and judging whether the output capacitor exceeds a first capacitor threshold value and a second capacitor threshold value, wherein the smoking state is judged only when the output capacitor exceeds the second capacitor threshold value and the time spent by the output capacitor to increase from the first capacitor threshold value to the second capacitor threshold value is less than a first time interval; the heating wire control unit controls the heating wire to heat based on the judgment result of the airflow induction judgment circuit; wherein the first capacitance threshold is less than the second capacitance threshold. According to the invention, the smoking and oil leakage states are accurately judged through the capacitance threshold value and the time interval, spontaneous combustion caused by oil leakage misjudgment is avoided, and the use safety of the electronic cigarette is ensured.)

1. An electronic cigarette oil leakage protection device comprises an airflow sensor, an airflow sensing discrimination circuit and an electric heating wire control unit;

the airflow sensor is used for detecting the airflow direction and the flow rate of the airflow flowing through the electronic cigarette and converting the airflow direction and the flow rate into an output capacitor;

the airflow induction judging circuit is used for detecting an output capacitor of the airflow inductor and judging whether the output capacitor exceeds a first capacitor threshold value and a second capacitor threshold value, wherein the smoking state is judged only when the output capacitor exceeds the second capacitor threshold value and the time spent by the output capacitor to increase from the first capacitor threshold value to the second capacitor threshold value is less than a first time interval;

the heating wire control unit controls the heating wire to heat based on the judgment result of the airflow induction judgment circuit;

wherein the first capacitance threshold is less than the second capacitance threshold.

2. The electronic cigarette oil leakage prevention apparatus of claim 1, wherein when the output capacitance does not exceed the first capacitance threshold, the airflow induction determination circuit determines that the electronic cigarette is in a non-smoking state, the heating wire control unit does not heat the heating wire, and the first capacitance threshold and the second capacitance threshold remain unchanged.

3. The electronic cigarette oil leakage prevention apparatus of claim 1, wherein when the output capacitance exceeds a first capacitance threshold but does not exceed a second capacitance threshold within a first time interval, the airflow sensing determination circuit determines that an oil leakage state exists, the heater wire control unit does not heat a heater wire, and the airflow sensing determination circuit detects the output capacitance of the airflow sensor within a plurality of detection cycles, resetting the first capacitance threshold and the second capacitance threshold.

4. The electronic cigarette oil leakage prevention apparatus of claim 1, 2 or 3, wherein the first and second capacitance thresholds are set based on an initial output capacitance value of the airflow sensor, the initial output capacitance value being an output capacitance value of the airflow sensor when the electronic cigarette is initially powered up.

5. The electronic cigarette oil leakage protection device of claim 4, wherein in the no-smoking state or the oil leakage state, when the airflow sensing determination circuit detects that the output capacitance of the airflow sensor is always smaller than the initial output capacitance value in a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold and the second capacitance threshold are reset accordingly.

6. The electronic cigarette oil leakage protection device of claim 4, wherein in the smoking state or oil leakage state, when the airflow sensing determination circuit detects that the output capacitance of the airflow sensor is always greater than the first capacitance threshold value in a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are reset accordingly.

7. The electronic cigarette oil leakage protection device of claim 4, wherein in the smoking state or oil leakage state, when the airflow sensing determination circuit detects that the output capacitance of the airflow sensor is always smaller than the first capacitance threshold value within a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are reset accordingly.

And the smoking unit judges smoking through the output signals of the second capacitance threshold value judging unit and the time interval judging unit.

8. An electronic cigarette oil leakage protection method is characterized by comprising the following steps:

detecting the flow direction and the flow rate of the airflow flowing through the electronic cigarette, and converting the flow direction and the flow rate into an output capacitor;

determining whether the output capacitance exceeds a first capacitance threshold and a second capacitance threshold, and determining a smoking state only if the output capacitance exceeds the second capacitance threshold and the time taken for the output capacitance to increase from the first capacitance threshold to the second capacitance threshold is less than a first time interval;

when the smoking state is judged, controlling the heating wire to heat;

wherein the first capacitance threshold is less than the second capacitance threshold.

9. The electronic cigarette oil leakage protection method according to claim 8, wherein when the output capacitance does not exceed the first capacitance threshold all the time, it is determined as a no-smoking state, the heating wire is not heated, and the initial capacitance, the first capacitance threshold and the second capacitance threshold remain unchanged.

10. The electronic cigarette oil leakage prevention method of claim 8, wherein when it is detected that the output capacitance exceeds a first capacitance threshold but does not exceed a second capacitance threshold within a first time interval, an oil leakage state is determined, a heating wire is not heated, and the initial capacitance, the first capacitance threshold and the second capacitance threshold are reset.

Technical Field

The invention relates to the technical field of electronic cigarettes, in particular to an electronic cigarette oil leakage protection device and method.

Background

The electronic cigarette in the market mainly comprises a smoke tube filled with nicotine solution, an evaporation device and a battery, wherein airflow and tobacco tar share the same channel, as is known, the medium coefficient of the tobacco tar is much higher than that of air, and the tobacco tar moves or gravity flows into the airflow channel during use, so that the capacitance detected by an airflow sensor is increased; in the prior art, the electronic cigarette smoking control device judges the smoking state through capacitance change, the electronic cigarette device cannot distinguish smoking or capacitance rise caused by oil leakage, misjudgment smoking is easily caused, spontaneous combustion burns a user, electronic cigarette explosion is caused in serious cases, and safe use of the electronic cigarette is not facilitated. How to accurately judge whether smoking or oil leakage state is a problem to be solved urgently in the prior art.

Disclosure of Invention

The invention aims to solve the problem that spontaneous combustion is generated because oil leakage and smoking states cannot be distinguished in the prior art, and provides an oil leakage device and method for an electronic cigarette.

The specific technical scheme is as follows:

an electronic cigarette oil leakage protection device comprises an airflow sensor, an airflow sensing discrimination circuit and an electric heating wire control unit;

the airflow sensor is used for detecting the airflow direction and the flow rate of the airflow flowing through the electronic cigarette and converting the airflow direction and the flow rate into an output capacitor;

the airflow induction judging circuit is used for detecting an output capacitor of the airflow inductor and judging whether the output capacitor exceeds a first capacitor threshold value and a second capacitor threshold value, wherein the smoking state is judged only when the output capacitor exceeds the second capacitor threshold value and the time spent by the output capacitor to increase from the first capacitor threshold value to the second capacitor threshold value is less than a first time interval;

the heating wire control unit controls the heating wire to heat based on the judgment result of the airflow induction judgment circuit;

wherein the first capacitance threshold is less than the second capacitance threshold.

Furthermore, the airflow induction judging circuit comprises a capacitance detection unit, a first capacitance threshold value judging unit, a second capacitance threshold value judging unit, a time interval judging unit and a smoking unit.

Further, the capacitance detection unit is configured to detect an output capacitance of the airflow sensor.

Further, the capacitance detection unit is further configured to set an initial capacitance.

The first capacitance threshold value judging unit is used for comparing whether the output capacitance exceeds a first capacitance threshold value.

The second capacitance threshold value judging unit is used for comparing whether the output capacitance exceeds a second capacitance threshold value.

Further, the time interval determination unit further includes a reference clock circuit, an oscillator, and a timing circuit.

Further, when the output capacitance does not exceed the first capacitance threshold, the airflow induction determination circuit determines that the smoking is not done, the heating wire control unit does not heat the heating wire, and the first capacitance threshold and the second capacitance threshold remain unchanged.

Further, when the output capacitance exceeds a first capacitance threshold but does not exceed a second capacitance threshold within a first time interval, the airflow sensing and determining circuit determines that the oil leakage state exists, the heating wire control unit does not heat the heating wire, and the airflow sensing and determining circuit detects the output capacitance of the airflow sensor within a plurality of detection periods and resets the first capacitance threshold and the second capacitance threshold.

Further, the first capacitance threshold and the second capacitance threshold are set based on an initial output capacitance value of the airflow sensor, where the initial output capacitance value is an output capacitance value of the airflow sensor when the electronic cigarette is initially powered on.

Further, the initial capacitance C0, a first capacitance threshold value discrimination unit threshold value C1, and a second capacitance threshold value discrimination unit threshold value C2;

further, the first capacitance threshold discrimination unit threshold calculation method comprises: c1 ═ C0+ Δ 1, C2 ═ C0+ Δ 2; wherein, Δ 1 can be 1/64-3/64 of C0, and Δ 2 can be 3/64-5/64 of C0.

Further, in the smoking state or the oil leakage state, when the airflow sensing judgment circuit detects that the output capacitance of the airflow sensor is always smaller than the initial output capacitance value within a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are correspondingly reset, wherein the second time interval is larger than the first time interval.

Further, in the smoking state or the oil leakage state, when the airflow sensing judgment circuit detects that the output capacitance of the airflow sensor is always greater than the first capacitance threshold value in a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are correspondingly reset, wherein the second time interval is greater than the first time interval.

Further, in the smoking state or the oil leakage state, when the airflow sensing judgment circuit detects that the output capacitance of the airflow sensor is always smaller than the first capacitance threshold value within a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are correspondingly reset, wherein the second time interval is larger than the first time interval.

Further, in the smoking state or the oil leakage state, when the airflow sensing judgment circuit detects that the output capacitance of the airflow sensor is always greater than the second capacitance threshold value in a second time interval, the initial output capacitance value is reset to the output capacitance of the airflow sensor at the end of the second time interval, and the first capacitance threshold value and the second capacitance threshold value are correspondingly reset, wherein the second time interval is greater than the first time interval.

An electronic cigarette oil leakage protection method comprises the following steps:

detecting the flow direction and the flow rate of the airflow flowing through the electronic cigarette, and converting the flow direction and the flow rate into an output capacitor;

determining whether the output capacitance exceeds a first capacitance threshold and a second capacitance threshold, and determining a smoking state only if the output capacitance exceeds the second capacitance threshold and the time taken for the output capacitance to increase from the first capacitance threshold to the second capacitance threshold is less than a first time interval;

when the smoking state is judged, controlling the heating wire to heat;

wherein the first capacitance threshold is less than the second capacitance threshold.

Further, the initial capacitance, the first capacitance threshold, and the second capacitance threshold are reset when the output capacitance exceeds a second capacitance threshold and the time it takes for the output capacitance to increase from the first capacitance threshold to the second capacitance threshold is less than a first time interval.

Further, when the output capacitance does not exceed the first capacitance threshold all the time, the smoking-free state is determined, the electric heating wire is not heated, and the initial capacitance, the first capacitance threshold and the second capacitance threshold are kept unchanged.

Further, when it is detected that the output capacitance exceeds a first capacitance threshold but does not exceed a second capacitance threshold within a first time interval, it is determined that an oil leakage state exists, the electric heating wire is not heated, and the initial capacitance, the first capacitance threshold and the second capacitance threshold are reset.

Further, when the output capacitance exceeds a second capacitance threshold value, but the time taken for the output capacitance to increase from the first capacitance threshold value to the second capacitance threshold value is greater than a first time interval, it is determined that an oil leakage state exists, the heating wire is not heated, the initial capacitance is reset, and the first capacitance threshold value and the second capacitance threshold value are set according to the reset initial capacitance.

Further, when the output capacitance exceeds the second capacitance threshold, but the time taken for the output capacitance to increase from the second capacitance threshold to the third capacitance threshold is greater than the second time interval, it is determined that the oil leakage state is present, the heating wire is not heated, the initial capacitance is reset, and the first capacitance threshold and the second capacitance threshold are set according to the reset initial capacitance.

Further, when the output capacitor does not exceed the initial capacitance value all the time, the reverse suck-back state is determined, the electric heating wire is not heated, the initial capacitor is reset, and the first capacitor threshold value and the second capacitor threshold value are set according to the reset initial capacitor.

Furthermore, when the output capacitance does not exceed the second capacitance threshold all the time, the time interval determination unit is not required to perform determination.

Further, the smoking unit is configured to receive output signals of the second capacitance threshold determination unit and the time interval determination unit for determination.

Further, the electric heating wire control unit receives signals of the smoking control unit and controls the electric heating wire to heat or close.

Further, the smoking control unit is connected with an indicator light or an audio circuit.

Further, the reset initial capacitance is the output capacitance at the end of the second time interval.

The invention has the beneficial effects that:

(1) according to the invention, the airflow induction distinguishing circuit is arranged to analyze and distinguish the smoking, oil leakage and non-smoking states of the electronic cigarette, a smoking signal is output only after the electronic cigarette is distinguished as the smoking state, and the electric heating wire control unit heats the electric heating wire after receiving the smoking signal distinguishing signal, so that the device is simple, the control method is direct, and the distinguishing is clear;

(2) according to the invention, the threshold value of the output capacitor and the time interval from the first threshold value to the second threshold value are judged, so that the misjudgment of the oil leakage state caused by controlling smoking by only detecting the rise of the capacitor is avoided, and the problem of spontaneous combustion caused by misjudgment due to the misjudgment of omission is prevented;

(3) the method for protecting the electronic cigarette against the oil leakage is simple and direct, and can be used for judging the states of smoking, oil leakage and no smoking, when the output capacitance does not exceed the second capacitance threshold value, the electronic cigarette does not need to enter a time interval unit for judgment, is directly judged as oil leakage or no smoking, and does not need to heat an electric heating wire; when the output capacitance is larger than the second capacitance threshold, the time interval judging unit is started, so that unnecessary judging links are reduced, and the judging time is saved;

(4) the electronic cigarette control method and the electronic cigarette control system judge whether the initial capacitance value of the next period is reset or not according to the state of the electronic cigarette, avoid the interference of capacitance change generated by oil leakage on a judgment result, and simultaneously guarantee the condition that the electronic cigarette cannot be heated normally after oil leakage.

Drawings

Fig. 1 is a structural frame diagram of an electronic cigarette oil leakage protection device according to the present invention;

FIG. 2 is a schematic diagram of the capacitance determination unit and the time interval determination unit of the apparatus of the present invention;

FIG. 3 is a schematic diagram of the output capacitance and time interval for a smoking state in the device of the present invention;

FIG. 4 is a schematic diagram of the output capacitance and time interval for a long-term smoking status of the device of the present invention;

FIG. 5 is a schematic diagram of the output capacitance and time interval for a no-smoking state of the device of the present invention;

FIG. 6 is a schematic diagram of the output capacitance and time interval during reverse suck-back of the device of the present invention;

FIG. 7 is an intention of the apparatus of the present invention to output capacitance and time in a slow oil leakage state;

FIG. 8 is a schematic diagram of the output capacitance and time of the apparatus of the present invention in a rapid oil leak state;

fig. 9 is a schematic view of an electronic cigarette oil leakage protection method according to the present invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that equivalent changes or substitutions in function, method or structure according to the embodiments are included in the scope of the present invention.

Certain terms are used throughout the description and claims to refer to particular components as would be understood by one of ordinary skill in the art. The present specification and the appended claims are intended to cover all such modifications, equivalents, and alternatives falling within the spirit and scope of the present invention as defined by the appended claims. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to," and "couple" is meant to encompass both direct and indirect electrical connections. Therefore, if the first circuit is coupled to the second circuit, it means that the first circuit can be directly electrically connected to the second circuit, or indirectly connected to the second circuit through other components such as resistors.

Referring to fig. 1, an electronic cigarette oil leakage protection device includes an airflow sensor, an airflow sensing and judging circuit, and a heating wire control unit; the airflow sensor is used for detecting the airflow direction and the flow rate of the airflow flowing through the electronic cigarette and converting the airflow direction and the flow rate into an output capacitor; the airflow induction judging circuit is used for detecting an output capacitor of the airflow inductor and judging whether the output capacitor exceeds a first capacitor threshold value and a second capacitor threshold value, wherein the smoking state is judged only when the output capacitor exceeds the second capacitor threshold value and the time spent by the output capacitor to increase from the first capacitor threshold value to the second capacitor threshold value is less than a first time interval; the heating wire control unit controls the heating wire to heat based on the judgment result of the airflow induction judgment circuit;

furthermore, the airflow induction judging circuit comprises a capacitance detection unit, a first capacitance threshold value judging unit, a second capacitance threshold value judging unit, a time interval judging unit and a smoking unit, wherein the first capacitance threshold value is smaller than the second capacitance threshold value.

Further, the capacitance detection unit is used for detecting the output capacitance of the airflow sensor.

Further, the capacitance detection unit is also used for setting an initial capacitance.

Further, the output capacitance varies depending on the flow direction and flow rate of the airflow.

The first capacitance threshold value judging unit is used for comparing whether the output capacitance exceeds a first capacitance threshold value.

The second capacitance threshold value judging unit is used for comparing whether the output capacitance exceeds a second capacitance threshold value.

Referring to fig. 2, a diagram is set for an initial capacitance, a first capacitance threshold, a second capacitance threshold, a first time interval, and a second time interval of the present invention, where the first capacitance threshold and the second capacitance threshold are set based on an initial output capacitance value of the airflow sensor, and the initial output capacitance value is an output capacitance value of the airflow sensor when the electronic cigarette is initially powered on.

Further, the initial capacitance C0, the first capacitance threshold C1, the second capacitance threshold C2, the output capacitance Cx, and the time t at which the output capacitance Cx appears at the first capacitance threshold C1₁Time t at which the second capacitance threshold C2 occurs₂At t₃A third capacitance Cx3 at which the output capacitance Cx appears at the time; .

The first and second capacitance threshold calculation methods are as follows: c1 ═ C0+ Δ 1, C2 ═ C0+ Δ 2; the electronic cigarette smoking state judgment method comprises the steps of obtaining 1/64-3/64 of C0 for delta 1, obtaining 3/64-5/64 of C0 for delta 2, and obtaining values of delta 1 and delta 2, wherein the values of the first time interval and the second time interval are not limited to the ranges, the first time interval and the second time interval are T1-T2-T1 and T2-T3-T2, the second capacitance threshold value C2 is larger than the first capacitance threshold value C1, and the second time interval T2 is larger than the first time interval T1.

Referring to fig. 3, a diagram of capacitance threshold and time interval of the smoking status of the e-cigarette is shown, wherein the time t1' when the first capacitance threshold occurs on the output capacitance Cx, the time t2' when the second capacitance threshold occurs are marked, and the time t2' when the first capacitance threshold occurs on the output capacitance Cx is shown₃The third capacitance Cx3 where the output capacitance Cx appears at the time point, the first time interval of the time when the output capacitance reaches the second threshold value from the first threshold value is T1 ﹦ T2 '-T1', the second time interval is Tx2 ﹦ T3 '-T2', and the second time interval is greater than the first time interval. When the output capacitance Cx exceeds the second capacitance threshold C2 and the time taken for the output capacitance to increase from the first capacitance threshold C1 to the second capacitance threshold C2 is less than the first time interval, it is determined that the smoking state is at this time, and the smoking time is less than the second time interval, Tx2 — T2.

Further, the smoking status is different from the long-term smoking status, specifically referring to fig. 4, which is a schematic diagram of the capacitance threshold and the time interval of the electronic cigarette in the long-term smoking status, when the output capacitance Cx exceeds the second capacitance threshold C2, and the time T2 taken for the output capacitance to increase from the first capacitance threshold C1 to the second capacitance threshold C3 is less than the first time interval T2₁When the smoking time is equal to the second time interval Tx 2-T2, the smoking state is determined to be a long-term smoking state, the heating wire is heated, and the smoking time is T₃The third capacitance Cx3 appearing at the time of the output capacitance Cx is reset to the initial capacitance C0 of the next cycle, and the first capacitance threshold C1 and the second capacitance threshold C2 are set according to the new initial capacitance C0.

Referring to fig. 5, which is a schematic diagram illustrating the capacitance threshold and the time interval in the no-smoking state, when the output capacitance Cx does not exceed the first capacitance threshold C1, the airflow sensing determination circuit determines that the no-smoking state is achieved, the heating wire control unit does not heat the heating wire, and the initial capacitance C0, the first capacitance threshold C1 and the second capacitance threshold C2 are kept unchanged. Furthermore, when the output capacitance Cx does not exceed the first capacitance threshold value, C1 does not need to enter a time interval unit, and the airflow induction judging circuit judges that the cigarette is in a non-smoking state, so that the judging path effectively saves the judging time.

Further, when the output capacitance Cx exceeds the first capacitance threshold C1 but does not exceed the second capacitance threshold C2 within the first time interval T1, without entering the time interval unit, the airflow sensing determination circuit determines that the oil leakage state is present, the heating wire control unit does not heat the heating wire, and the airflow sensing determination circuit detects the output capacitance of the airflow sensor within the second time interval, and will detect the output capacitance at T₃The third capacitance Cx3 occurring at the time of the output capacitance Cx is reset to the initial capacitance C0, the first capacitance threshold C1, and the second capacitance threshold C2 will also be reset accordingly.

The time interval judging unit is used for detecting the time required by the output capacitance to rise from the first capacitance threshold to the second capacitance threshold and the time of the second capacitance threshold rising to the third capacitance Cx3 threshold.

Furthermore, the time interval judging unit further comprises a reference clock circuit, an oscillator and a timing circuit, wherein the reference clock circuit is used for providing a reference clock; an oscillator for outputting an oscillating clock signal; the timing circuit is used for correcting the reference clock; the electrical connections and signal transmission of the reference clock circuit, the oscillator and the timing circuit are known to those skilled in the art and will not be described herein.

It is worth mentioning that the smoking unit receives a determination signal indicating whether the output capacitance of the second capacitance threshold determination unit is larger than the second capacitance threshold and a determination signal indicating whether the time required by the time interval determination unit to raise the output capacitance from the first capacitance threshold to the second capacitance threshold is smaller than the first time interval, combines the two determination signals to determine the smoking state, and only when the output capacitance exceeds the second capacitance threshold and the time taken by the output capacitance to raise the output capacitance from the first capacitance threshold to the second capacitance threshold is smaller than the first time interval, the smoking unit outputs a smoking signal to be sent to the electric heating wire control unit to heat the electric heating wire. The device of the invention has simple and comprehensive judgment on the smoking state, does not output smoking signals to other people who do not meet the smoking state, prevents the spontaneous combustion of the electronic cigarette and ensures the use safety of users. Furthermore, the smoking unit can be connected with an indicator light, when a smoking signal is output, the indicator light gives out light indication, of course, the smoking unit can also be connected with an audio circuit, and when the smoking unit gives out the smoking signal, a prompt tone or music and the like are given out.

Referring to fig. 6, in the reverse blowing state of the electronic cigarette, when the airflow sensing determination circuit detects that the output capacitance Cx of the airflow sensor is always smaller than the initial output capacitance C0 in the second time interval, the initial output capacitance is reset to the output capacitance Cx3 of the airflow sensor at the end of the second time interval, and the first capacitance threshold and the second capacitance threshold are correspondingly reset, where the second time interval is greater than the first time interval.

When the output capacitance Cx exceeds the first capacitance threshold C1 but does not exceed the second capacitance threshold C2 within the first time interval, the airflow sensing judgment circuit judges that the oil leakage state exists, the heating wire control unit does not heat the heating wire, and the airflow sensing judgment circuit detects the output capacitance of the airflow sensor within the second time interval and resets the third capacitance Cx3 to the initial capacitance C0, and the first capacitance threshold and the second capacitance threshold are also reset correspondingly.

In a smoking state or an oil leakage state, when the airflow induction judging circuit detects that the output capacitance Cx of the airflow inductor is always larger than the first capacitance threshold value C1 in a second time interval, the initial output capacitance C0' value is reset to the output capacitance Cx3 of the airflow inductor at the end of the second time interval, the first capacitance threshold value C1 and the second capacitance threshold value C2 are correspondingly reset, and the second time interval T2 is larger than the first time interval T1.

When the output capacitance Cx is always greater than the first capacitance threshold C1 in the second time interval, there are two oil leakage situations: in case one, referring to fig. 7, when Cx is greater than the first capacitance threshold C1 and is less than the second capacitance threshold C2, the time interval determination unit is not entered, the oil leakage is directly determined, the heating wire is not heated, and the initial capacitance C0 is reset to the output capacitance Cx3, specifically, the capacitance increase caused by the slow oil leakage; in case two, referring to fig. 8, when Cx is greater than the first capacitance threshold C1 and greater than the second capacitance threshold C2, the time interval determination unit is entered, when the time Tx2 taken for the output capacitance Cx to increase from the first capacitance threshold to the second capacitance threshold is greater than or equal to the first time interval T1, it is determined that oil is leaked, the heating wire is not heated, the initial capacitance C0 is reset to the output capacitance Cx3, the output capacitance of the airflow sensor is detected in the second time interval, and the third capacitance Cx3 is reset to the initial capacitance, and the first capacitance threshold and the second capacitance threshold are also reset accordingly. In particular a rapid increase in capacitance caused by a rapid oil leak.

In a specific implementation, when the airflow sensing judgment circuit detects that the output capacitance Cx of the airflow sensor is always smaller than the first capacitance threshold C1 in the second time interval, the initial output capacitance C0 value is reset to the output capacitance Cx3 of the airflow sensor at the end of the second time interval, and the first capacitance threshold C1 and the second capacitance threshold C2 are correspondingly reset; when the air flow induction judging circuit detects that the output capacitance Cx is always larger than the second capacitance threshold value C2 in the second time interval, and the first time interval of the output capacitance is larger than Tx1 and is always smaller than the first time interval T1, the initial capacitance C0, the first capacitance threshold value C1 and the second capacitance threshold value C2 are kept unchanged.

The inventor summarizes through a large number of experiments that the initial capacitance, the first capacitance threshold value and the second capacitance threshold value of the electronic cigarette device can be kept unchanged without resetting in the smoking state and the non-smoking state. When the electronic cigarette device is in a long-term smoking state, a reverse blow-down state and an oil leakage state, the initial capacitance, the first capacitance threshold value and the second capacitance threshold value are reset. Therefore, it is within the scope of the present invention to identify different states of the electronic cigarette to determine whether the capacitor needs to be reset.

The device judges the smoking state through the capacitance threshold value and the time interval, and accurately judges whether the initial capacitance is reset or not, the device accurately and quickly judges the state of the electronic cigarette, resets the initial capacitance of the smoking state, the long-term smoking state, the reverse blow-down state and the oil leakage state of the electronic cigarette, ensures the normal heating work and the state judgment accuracy of the electronic cigarette under the condition of increasing the output capacitance, and more effectively prevents the oil leakage and spontaneous combustion of the electronic cigarette.

For the sake of convenience in examining and helping those skilled in the art to understand the invention more directly, referring to the following table, the electronic cigarette status corresponds to the discrimination parameters and the reference figures.

Referring to fig. 9, the invention further provides an electronic cigarette oil leakage protection method, which includes the following steps:

detecting the flow direction and the flow rate of the airflow flowing through the electronic cigarette, and converting the flow direction and the flow rate into an output capacitor; determining whether the output capacitance exceeds a first capacitance threshold and a second capacitance threshold, and determining a smoking state only if the output capacitance exceeds the second capacitance threshold and the time taken for the output capacitance to increase from the first capacitance threshold to the second capacitance threshold is less than a first time interval;

when the smoking state is judged, controlling the heating wire to heat;

wherein the first capacitance threshold is less than the second capacitance threshold.

Specifically, when the output capacitance does not exceed the first capacitance threshold all the time, the smoking-free state is determined, the electric heating wire is not heated, and the first capacitance threshold and the second capacitance threshold are kept unchanged.

When the output capacitor is detected to exceed a first capacitor threshold value but not exceed a second capacitor threshold value within a first time interval, an oil leakage state is determined, the electric heating wire is not heated, and the first capacitor threshold value and the second capacitor threshold value are reset.

When the output capacitance does not exceed the second capacitance threshold all the time, the time interval judging unit is not needed to judge.

Further, the smoking unit is configured to receive output signals of the second capacitance threshold determination unit and the time interval determination unit for determination.

Further, the electric heating wire control unit receives signals of the smoking control unit and controls the electric heating wire to heat or close.

The method for judging the oil leakage protection device of the electronic cigarette comprises the steps that when Cx is smaller than a threshold value C1 of a first capacitance threshold value judging unit, a judging time interval unit is not needed, and the electronic cigarette is directly judged not to smoke; and when Cx is larger than the threshold value C2 of the second capacitance threshold value judging unit, entering a time judging unit, comparing whether the first time interval Tx1 of Cx capacitance is smaller than the first time interval T1, and further judging oil leakage and smoking.

It is worth noting that the oil leakage protection method also sets the reset capacitance judgment aiming at different states, namely the initial capacitance C0 is not needed to be reset only in the non-smoking state and the smoking state, and the output capacitance CX2 at the end of the second time interval is set as the initial capacitance C0 in other states, so that the detection accuracy of the electronic cigarette state is ensured, and the normal heating and burning after the electronic cigarette capacitance changes are also ensured.

The electronic cigarette oil leakage protection method comprises the steps that an output capacitor and a time interval are judged through an airflow judging circuit, and a smoking state is judged only when the output capacitor exceeds a second capacitor threshold value and the time spent by the output capacitor to increase from a first capacitor threshold value to the second capacitor threshold value is less than a first time interval; the parameters for judging the smoking state are clear, the electric heating wires are not heated in other states, the judging method is simple and quick, the judgment omission and the misjudgment are avoided, when the initial capacitance Cx is smaller than the threshold value C1 of the first capacitance threshold value judging unit, the judgment time interval unit does not need to be entered, and the judging link and the judging time are saved.

The inventor summarizes according to the rule of the capacitance and the time interval of the electronic cigarette, judges the smoking state from the two aspects of the time interval of the output capacitance and the capacitance threshold value, also distinguishes and judges smoking, long-term smoking, oil leakage, no smoking and reverse suck-back, and outputs a judging signal to a heating wire control unit to control a heating wire; and whether the initial capacitor is reset correspondingly in a further refinement state ensures the normal working problem after the capacitor is changed. The device has compact structure and reasonable arrangement of the judging method, prevents spontaneous combustion caused by judging smoking conditions only through capacitance change, and ensures the use safety of electronic cigarette users.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.