An algorithm for dust concentration sensing of a vacuum cleaner

Abstract

The application discloses a dust cleaner flying dust concentration sensing algorithm, comprising the following steps: S1: when flying dust enters the dust cleaner air inlet, an infrared emission receiving circuit outputs a fast jumping voltage analog quantity between 0V and 5V; S2: sampling the voltage analog quantity at a fHz sampling frequency, sampling N voltage analog quantities in a dust concentration calculation period T, calculating the maximum value V max and the minimum value V min of the voltage analog quantity in the current period T ((n-1)*T~nT) at each n*T (n=1, 2, 3,...) time point, and then calculating the maximum difference V diff of the voltage analog quantity in the current T; S3: according to the voltage analog quantity difference V diff in the current calculation period T and the dust concentration value DustDensityLast in the last calculation period, the dust concentration value DustDensityNow in the current period T is calculated. According to the application, the dust cleaner flying dust concentration sensing is realized through a control algorithm, and experimental results show that the concentration sensing algorithm is sensitive and stable to the dust cleaner flying dust concentration, and the effect is obvious.

Description

TECHNICAL FIELD

[0001] The present application relates to dust cleaner dust concentration sensing technology field, specifically a kind of dust cleaner dust concentration sensing algorithm. BACKGROUND

[0002] With the rapid development of science and technology, dust cleaner has entered thousands of households. Now the rhythm of society is fast, the use of dust cleaner in family cleaning, saves a lot of precious time for people. With the progress of science and technology and the improvement of energy consumption requirements, the demand of different dust concentration corresponding different dust power has been recognized by the majority of users, therefore, a concentration sensing algorithm that can sensitively detect dust concentration and make dust power change smoothly is particularly necessary. SUMMARY

[0003] The present application aims to provide a kind of dust cleaner dust concentration sensing algorithm, to solve the problems in the prior art.

[0004] To achieve the above object, the present application provides the following technical scheme: a kind of dust cleaner dust concentration sensing algorithm, comprising the following steps:

[0005] S1: when dust enters the dust cleaner suction port, infrared emission receiving circuit outputs the voltage analog quantity that jumps between 0V and 5V rapidly;

[0006] S2: voltage analog quantity is sampled with fHz sampling frequency, N voltage analog quantity is sampled in a dust concentration calculation period T, the maximum value V max And minimum value V min Of voltage analog quantity in each n*T (n=1,2,3, …) time calculation current period T ((n-1)*T~nT) is calculated, then the maximum difference V diff Of voltage analog quantity change in current T is calculated;

[0007] S3: according to the difference V diff Of voltage analog quantity in current calculation period T and the last calculation period dust concentration value DustDensityLast, the dust concentration value DustDensityNow in current period T is calculated;

[0008] S4: V diff =0, it indicates that no dust enters in current period T, subsequently dust concentration DustDensityNow is reduced according to the rate of DensityDelta / T;

[0009] S5: At each n*T (n=1,2,3,…) time, based on the dust concentration value DustDensityNow in the current period T, calculate the dust collection power Power in the next period T. The relationship between Power and DustDensityNow is a piecewise function.

[0010] S6: The relevant formula for concentration sensing is as follows:

[0011] V diff =V max -V min

[0012] DustDensityNow=DustDensityLast+α*V diff In the formula, α is the concentration.

[0013] Degree of increase factor;

[0014] α = (MaxDensity - DustDensityLast) * ρ / MaxDensity, where ρ is the concentration change factor, a positive constant that is adjusted according to the actual power change rate. MaxDensity is the maximum concentration value of 100.

[0015] Preferably, in step S1, when dust particles are continuously inhaled, a pulse-like waveform is also continuously output.

[0016] Preferably, in S2, the sampling period t = 1 / f seconds and N = T / t.

[0017] Preferably, S3 needs to limit the amplitude of DustDensityNow, with a maximum value of 100.

[0018] Preferably, the sampling frequency f ≥ 100Hz.

[0019] Preferably, DustDensityNow = DustDensityLast + α*V diff V diff It is a non-negative value.

[0020] Compared with the prior art, the beneficial effects of the present invention are: it realizes the sensing of the dust concentration of the vacuum cleaner through the control algorithm. Experimental results show that the concentration sensing algorithm is sensitive and stable to the dust concentration of the vacuum cleaner, and the effect is obvious. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 In this embodiment of the invention, an algorithm for sensing the concentration of dust in a vacuum cleaner includes the following steps:

[0025] S1: When dust enters the vacuum cleaner's air intake, the infrared transmitting and receiving circuit outputs a rapidly changing analog voltage between 0V and 5V.

[0026] S2: Sample the analog voltage at a sampling frequency of fHz. Sample N analog voltage values ​​within one dust concentration calculation period T. Calculate the maximum value V of the analog voltage within the current period T ((n-1)*T~nT) at each n*T (n=1,2,3,…) time point. max and minimum value V min Then calculate the maximum difference V of the analog voltage change within the current time interval T. diff ;

[0027] S3: Based on the voltage analog quantity difference V within the current calculation period T. diff The dust concentration value DustDensityNow in the current period T is calculated by combining the dust concentration value DustDensityLast from the previous calculation period.

[0028] S4:V diff When the value is 0, it means that no dust enters during the current period T, and the dust concentration DustDensityNow then decreases at a rate of DensityDelta / T.

[0029] S5: At each n*T (n=1,2,3,…) time, based on the dust concentration value DustDensityNow in the current period T, calculate the dust collection power Power in the next period T. The relationship between Power and DustDensityNow is a piecewise function.

[0030] S6: The relevant formula for concentration sensing is as follows:

[0031] V diff =V max -V min

[0032] DustDensityNow=DustDensityLast+α*V diff In the formula, α is the concentration.

[0033] Degree of increase factor;

[0034] α = (MaxDensity - DustDensityLast) * ρ / MaxDensity, where ρ is the concentration change factor, a positive constant that is adjusted according to the actual power change rate. MaxDensity is the maximum concentration value of 100.

[0035] Preferably, in step S1, when dust particles are continuously inhaled, a pulse-like waveform is also continuously output.

[0036] Preferably, in S2, the sampling period t = 1 / f seconds and N = T / t.

[0037] Preferably, S3 needs to limit the amplitude of DustDensityNow, with a maximum value of 100.

[0038] Preferably, the sampling frequency f ≥ 100Hz.

[0039] Preferably, DustDensityNow = DustDensityLast + α*V diff V diff It is a non-negative value.

[0040] This invention is based on the voltage analog quantity change curve output by the infrared transmitting-receiving circuit.

[0041] When dust enters the vacuum cleaner's suction port, the infrared transmitter and receiver circuit (sensor) outputs a rapidly fluctuating analog voltage (SensorVoltage) between 0V (MinVoltage) and 5V (MaxVoltage). This pulse-like waveform is continuously output as dust is continuously sucked in.

[0042] The analog voltage is sampled at a sampling frequency of fHz (sampling period t = 1 / f seconds). N (N = T / t) analog voltage values ​​are sampled within one dust concentration calculation period T. The maximum value V of the analog voltage within the current period T ((n-1)*T ~ nT) is calculated at each n*T (n = 1, 2, 3, ...) time point. max and minimum value V min Then calculate the maximum difference V of the analog voltage change within the current time interval T. diff .

[0043] Based on the voltage analog quantity difference V within the current calculation period T diff The dust concentration value DustDensityLast from the previous calculation period is used to calculate the dust concentration value DustDensityNow in the current period T. Finally, DustDensityNow needs to be limited, with a maximum value of 100 (MaxDensity).

[0044] V diff When the value is 0, it means that no dust enters during the current period T. Subsequently, the dust concentration DustDensityNow decreases at a rate of DensityDelta / T, and DensityDelta is adjusted according to the actual rate of decrease.

[0045] At each n*T (n=1,2,3,…) time, based on the dust concentration value DustDensityNow in the current period T, the suction power Power in the next period T is calculated. There is a piecewise function relationship between Power and DustDensityNow, which realizes the segmented control of the suction motor power. The segment point, the number of segments, and the power of each segment are adjusted according to the actual suction effect.

[0046] The relevant formulas for concentration sensing are as follows:

[0047] V diff =V max -V min

[0048] DustDensityNow=DustDensityLast+α*V diff In the formula, α is the concentration.

[0049] Degree of increase factor,

[0050] α = (MaxDensity - DustDensityLast) * ρ / MaxDensity, where ρ is the concentration change factor, a positive constant that is adjusted according to the actual power change rate requirement, and MaxDensity is the maximum concentration value of 100.

[0051] The sampling frequency f>=100Hz ensures that the peak value of the minimum voltage analog pulse can be sampled.

[0052] With f = 100Hz (t = 10ms) and T = 200ms, N = T / t = 20, the timeliness of dust concentration calculation is ensured, and the sensitivity of dust collection power change is taken into account, while also taking into account the stability of power change.

[0053] DustDensityNow=DustDensityLast+α*V diff V diff non-negative

[0054] This value ensures that the concentration of dust increases during inhalation, preventing sudden drops or rises in suction power.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An algorithm for dust concentration sensing in a vacuum cleaner, characterized by: The method comprises the following steps: S1: When dust enters the suction port of the vacuum cleaner, the infrared emission-receiving circuit outputs a fast jumping voltage analog quantity between 0 V and 5 V; S2: The analog voltage is sampled at a sampling frequency of f Hz. N analog voltage values ​​are sampled within one dust concentration calculation period T. The maximum value V of the analog voltage within the current period T is calculated at each n*T time point. max and minimum value V min Then calculate the maximum difference V of the analog voltage change within the current time interval T. diff Where n = 1, 2, 3, ...; S3: according to the voltage analog quantity difference V diff and the dust concentration value DustDensityLast of the last calculation period, the dust concentration value DustDensityNow in the current period T is calculated; S4: V diff = 0, it means that no dust enters in the current period T, and then the dust concentration DustDensityNow decreases at the rate of DensityDelta / T. S5: At each n*T time, according to the dust concentration value DustDensityNow in the current period T, the dust suction power Power in the next period T is calculated, and Power and DustDensityNow are in a segmented function relationship; wherein n=1, 2, 3, …; S6: The related formula of concentration sensing is as follows: V diff =V max - V min DustDensityNow = DustDensityLast + a * V diff where a is a concentration increase coefficient. α= (MaxDensity- DustDensityLast) *ρ / MaxDensity, wherein ρ is a concentration change rate, which is a positive constant, adjusted according to the actual power change speed requirement, and MaxDensity is the maximum concentration value 100.

2. The algorithm for dust concentration sensing of a dust cleaner according to claim 1, wherein: In S1, when dust is continuously sucked in, a pulse-like waveform is also continuously output.

3. The algorithm for dust concentration sensing of a dust cleaner according to claim 1, wherein: In S3, DustDensityNow needs to be limited in amplitude, and the maximum value is 100.

4. The algorithm for dust concentration sensing of a dust cleaner according to claim 1, wherein: The sampling frequency f is greater than or equal to 100 Hz.

5. The algorithm for dust concentration sensing of a dust cleaner according to claim 1, wherein: DustDensityNow = DustDensityLast + a * V diff , V diff is non-negative.

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