CN111134573B - Method for improving precision of dust detection sensor - Google Patents

Abstract

The invention relates to the field of sensors, in particular to a method for improving the precision of a dust detection sensor, which comprises the following steps: providing an electrical drive VT of a determined value to a transmitter of the dust detection sensor in a calibrated operating environment; receiving a detection electrical signal VR output from the receiver of the dust detection sensor; comparing the value of the detection electric signal VR with the value of a preset reference signal VS, and judging whether the difference value of the two is within a preset range; compared with the prior art, the invention realizes the real-time calibration of the sensitivity of the dust detection sensor in the dust concentration detection process, and avoids the dust sensor working at an improper measurement curve position, thereby effectively improving the measurement precision and the measurement stability of the dust detection sensor.

Description

Method for improving precision of dust detection sensor

Technical Field

The invention relates to the field of sensors, in particular to a method for improving the precision of a dust detection sensor.

Background

A dust sensor of a vacuum cleaner is a device for detecting parameters such as dust concentration and dust particle diameter applied to a vacuum cleaner and the like.

The dust sensor commonly used at present adopts infrared rays to detect dust; the detection principle is as follows: one side of the sensor emits infrared light, and the other side receives the infrared light. When the dust is detected to pass through, the intensity of light received by the sensor is weakened because the infrared light is shielded by the dust. The analog voltage and digital waveform output by the receiving circuit in the dust collector are changed along with the change of the analog voltage and digital waveform, so that the dust state such as dust concentration or dust particle diameter can be detected.

When the dust sensor is used for detecting dust, the sensitivity, the accuracy and the like of the sensor are not consistent in the whole range of the working voltage or the working current, actually, the detection values of the sensor receiver are usually inconsistent in the measurement characteristics such as the accuracy, the stability, the linearity and the like in the whole measurement range, and the better measurement accuracy, the stability and the linearity can be obtained in a range near a certain value of a measurement curve, so that a more accurate detection result can be obtained; the output voltage value or the output current value is referred to as a reference value. If the sensor is operated far from the reference value, the measurement result is either too slow to be low or too sensitive to obtain a stable output result.

In the prior art, the dust sensor is generally calibrated when it leaves the factory, and the receiver is operated near the reference value of the measurement curve by providing a suitable electric drive to the transmitter of the sensor, so as to obtain a more accurate measurement result.

However, dust tends to adhere to the sensor surface during operation of the cleaner. If dust is attached before the concentration is detected, the required reference value can be obtained by using a common method for calibration once, but if dust is attached during the calibration process and leaves the detection area after the calibration, the receiver can work at an excessively high measurement curve position; another situation is that dust adheres to the sensor during real-time dust detection after calibration of the reference values is completed, which directly results in the receiver operating at too low a measurement curve position. The above conditions can lead to inaccurate or unstable measurement results, which is very disadvantageous for the vacuum cleaner to adjust and control by using the measurement results.

There is no good solution to the above problems in the prior art.

Disclosure of Invention

The invention provides a method for improving the precision of a dust detection sensor, which is used for solving the technical problem of reduced precision of the dust sensor caused by dust adhesion.

The invention provides a method for improving the precision of a dust detection sensor, which comprises the following steps: providing an electrical drive VT of a determined value to a transmitter of the dust detection sensor in a calibrated operating environment; receiving a detection electrical signal VR output from the receiver of the dust detection sensor; comparing the value of the detection electric signal VR with the value of a preset reference signal VS, and judging whether the difference value of the two is within a preset range; if yes, the value of the electric drive VT provided currently meets the requirement, and the value is used as the electric drive for the emitter of the dust detection sensor to work;

optionally, if the determination result is negative, the following steps are executed: adjusting the value of the electrical drive VT in the opposite direction according to the comparison result of the value of the detection electrical signal VR and the value of the reference signal VS, and returning to the step of receiving the detection electrical signal VR output from the receiver of the dust detection sensor.

Optionally, the detection electrical signal VR and the reference signal VS are characterized by one of a voltage, a current, a pulse signal and a square wave signal.

Optionally, the electric drive uses a driving voltage, and the detection electric signal VR and the reference signal VS are characterized by voltage values; said providing an electric drive VT of a determined value to an emitter of said dust detection sensor in a calibrated operating environment, comprising the steps of: obtaining voltage values of detection electric signals VR output by a receiver and respectively corresponding to an upper limit voltage value and a lower limit voltage value of the driving voltage in a driving voltage range; establishing a functional relation between the driving voltage and the detection electric signal VR according to two groups of data, namely the upper limit voltage value of the driving voltage, the voltage value of the detection electric signal VR output by the receiver corresponding to the upper limit voltage value of the driving voltage, and the voltage value of the detection electric signal VR output by the receiver corresponding to the lower limit voltage value of the driving voltage, and the lower limit voltage value of the driving voltage; obtaining an estimated value of the driving voltage VT corresponding to the reference signal VS according to the functional relation between the driving voltage and the detection electric signal VR; and taking the estimated value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of providing the determined value for the emitter of the dust detection sensor, and carrying out the subsequent steps.

Optionally, a value of the analog voltage signal obtained after the voltage signal is stabilized is used as a detection electrical signal output by the receiver.

Optionally, after the number of the digital square wave signals to be used for representing the dust state is kept to be 0 at time intervals of a specified length, the voltage value of the obtained detection electric signal VR is used as the detection electric signal output by the receiver.

Optionally, if not, adjusting the electric drive VT in an opposite direction according to a comparison result between the detection electric signal VR and the reference signal VS, specifically: forming a set of data of the value of the electrical drive VT used in the last debugging round and the obtained value of the detected electrical signal VR output by the receiver corresponding thereto as current data; if the value of the detection electrical signal VR is lower than the value of a preset reference signal VS, re-establishing the functional relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is higher than the preset reference signal VS and is closest to the reference signal VS and is obtained in the previous adjusting step; if the value of the detection electrical signal VR is higher than the value of a preset reference signal VS, re-establishing the functional relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is obtained in the previous adjusting step, is lower than the preset reference signal VS and is closest to the reference signal VS; according to the function relation between the driving voltage and the detection signal VR which are reestablished, the calculation value of the driving voltage VT corresponding to the reference signal VS is obtained again; taking the retrieved derived value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of supplying the emitter of the dust detection sensor with the determined value, and performing the subsequent steps; the above steps are repeated until the driving voltage VT meeting the requirements is obtained.

Optionally, the electric drive uses a driving voltage, and the detection electric signal VR and the reference signal VS are characterized by voltage values; said providing an electric drive VT of a determined value to an emitter of said dust detection sensor in a calibrated operating environment, comprising the steps of: obtaining a voltage value of a first detection electric signal VR output by a receiver corresponding to a first driving voltage value, wherein the first driving voltage value is any estimated value in a driving voltage range; obtaining a voltage value of a second detection electrical signal VR output by the receiver corresponding to a second driving voltage value, wherein the second driving voltage value is a value different from the first driving voltage value in a driving voltage range; establishing a functional relation between the driving voltage VT and the detection electric signal VR according to two groups of data of the first driving voltage value, the voltage value of the first detection electric signal VR and the second driving voltage value and the voltage value of the second detection electric signal VR as initial data; obtaining an estimated value of the driving voltage VT corresponding to the reference signal VS according to the functional relation between the driving voltage VT and the detection electrical signal VR; the derived value of the driving voltage VT corresponding to the reference signal VS is used as the value of the electric driving VT in the step of the electric driving VT providing the determined value for the emitter of the dust detection sensor, and the subsequent steps are performed.

Optionally, when the first detection electrical signal VR and the second detection signal VR are both analog voltage signals, the value of the analog voltage signal obtained after the voltage signal is stabilized is used as the detection electrical signal output by the receiver.

Optionally, when the first detection electrical signal VR and the second detection electrical signal VR are both digital pulse signals, after the number of the digital pulse signals is kept to be 0 at a time interval with a specified length, the obtained voltage value of the detection electrical signal VR is used as the detection electrical signal output by the receiver.

Optionally, if not, adjusting the electric drive VT in an opposite direction according to a comparison result between the detection electric signal VR and the reference signal VS, specifically: forming a group of data by using the value of the electric drive VT used in the debugging of the round and the obtained value of the detection electric signal VR output by the receiver corresponding to the value of the electric drive VT as current data; if the value of the detection electrical signal VR is lower than the value of a preset reference signal VS, re-establishing the functional relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is higher than the preset reference signal VS and is closest to the reference signal VS and is obtained in the previous adjusting step; if the value of the detection electrical signal VR is higher than the value of a preset reference signal VS, re-establishing the functional relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is obtained in the previous adjusting step, is lower than the preset reference signal VS and is closest to the reference signal VS; according to the function relation between the driving voltage and the detection signal VR which are reestablished, the calculation value of the driving voltage VT corresponding to the reference signal VS is obtained again; taking the retrieved derived value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of supplying the emitter of the dust detection sensor with the determined value, and performing the subsequent steps; the above steps are repeated until the driving voltage VT meeting the requirements is obtained.

Optionally, if not, adjusting the electric drive VT in an opposite direction according to a comparison result between the detection electric signal VR and the reference signal VS, specifically: forming a group of data by using the value of the electric drive VT used in the current debugging and the obtained value of the detection electric signal VR output by the receiver corresponding to the value of the electric drive VT, and adding the group of data into the data obtained in the previous debugging and the initial data to form current sample data; according to the current sample data, reestablishing the functional relation between the driving voltage and the detection electric signal VR; according to the linear function relation between the re-established driving voltage and the detection signal VR, re-obtaining the calculated value of the driving voltage VT corresponding to the reference signal VS; taking the retrieved derived value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of supplying the emitter of the dust detection sensor with the determined value, and performing the subsequent steps; the above steps are repeated until the driving voltage VT meeting the requirements is obtained.

Optionally, the functional relationship is a linear functional relationship.

The invention also provides a dust collector and a method for improving the precision of the dust detection sensor by adopting any one of the methods.

Compared with the prior art, the method has the following advantages:

the method for improving the precision of the dust detection sensor provided by the invention adopts the steps of providing the emitter of the dust detection sensor with the driving voltage VT with a determined value, comparing the difference value of the analog electrical signal VR obtained under the driving voltage VT with the reference analog signal VS, and enabling the difference value of the two signals to be in a preset range by adopting a repeated iteration mode, thereby realizing the real-time calibration of the sensitivity of the dust detection sensor in the dust concentration detection process, avoiding the dust sensor from working at an improper measurement curve position, and effectively improving the measurement precision and the measurement stability of the dust detection sensor.

Drawings

FIG. 1 is a logic block diagram of the present invention for the various systems of a vacuum cleaner;

FIG. 2 is a logic block diagram of the modules in the vacuum cleaner of the present application;

FIG. 3 is a logic block diagram of the display device of the vacuum cleaner of the present application;

FIG. 4 is a schematic view of the display device of the vacuum cleaner of the present application displaying information;

FIG. 5 is an enlarged view of portion B of FIG. 4;

FIG. 6 is a schematic circuit diagram of a dust detection apparatus according to an embodiment of the present application;

FIG. 7 is a cross-sectional view of the mounting structure of the transmitter and receiver of the present application;

FIG. 8 is a schematic view of the dust detecting apparatus of the present application for detecting dust;

FIG. 9 is a schematic view of a wiper mechanism of the dust detecting apparatus of the present application;

FIG. 10 is a schematic circuit diagram of a transparent window of the present application;

FIG. 11 is a logic block diagram of the present invention for a vacuum cleaner pressure detection and protection system;

FIG. 12 is a flow chart of the operation of the controller of the present application;

FIG. 13 is a logic block diagram of the present application for a vacuum cleaner governor control system;

FIG. 14 is a schematic structural diagram of a touch sensor according to the present application;

FIG. 15 is a schematic view of the structure of a touch panel of the present application;

FIG. 16 is a schematic view of the position relationship between the touch sensing member and the touch pad according to the present invention;

FIG. 17 is a front view of the vacuum cleaner of the present application;

FIG. 18 is a flow chart of a method for adjusting the power of a suction motor of a vacuum cleaner according to the present application;

FIG. 19 is a flow chart of a method of improving the accuracy of a dust detection sensor according to the present application;

fig. 20 is a flow chart of a specific manner of adjusting the electric drive VT in a function-fitting manner;

FIG. 21 is a flow chart of the present application for determining an electrically driven VT;

fig. 22 is another flow chart of the present application for determining an electrically driven VT.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.

Referring to fig. 1 and 2, fig. 1 is a logic block diagram of the vacuum cleaner; FIG. 2 is a logic block diagram of the modules in the vacuum cleaner of the present application;

the application provides a hand-held vacuum cleaner, includes: the dust collector comprises a dust collector display system 100, a dust detection system 200, an air pressure detection protection system 300, a speed regulation control system 400, a motor driving system 500 and a control system 600. In each of the above systems, the control system 600 has a relationship of control and information feedback with each of the other systems, and therefore, there may be a portion of a combination of the other systems and the control system that partially overlaps.

The cleaner display system 100 includes: the portion of the controller in the control system 600 that is related to the display control, and the cleaner display device 110; the cleaner display device 110 includes a light emitting display unit 111, a driving unit 112; a battery level display section 113, a power display section 114, and a display screen 115;

the dust detection system 200 includes: the portion of the controller in the control system 600 that is relevant to dust detection control, and the dust detection device 210; the dust detection device 210 includes: a sensor 211, a transparent window 212, a sensor circuit 213, a motor module 214, a wiper strip 215, and a wiper strip stop 216.

The control system 600 includes: controller 610, converter 620. The controller 610 may be implemented by using an MCU control chip and a related peripheral circuit, a printed circuit board on which the MCU control chip is located may be referred to as a main control board, and symbols of the control chip are sometimes used to show in the drawings.

The air pressure detection protection system 300 includes: the air pressure detecting module 310, the comparator 320, the first controller 611 of the controller 610 for controlling the air pressure, and the first converter 621 of the converter 620 for controlling the air pressure.

The speed control system 400 includes: a second controller 612 for controlling power in the touch sensing element 410, the power control device 420, the touch panel 430, and the controller 610, and a second converter 622 for controlling power in the converter;

the motor drive system 500 includes: a power switch button 510, a battery pack 520, a dust suction motor 530 and a floor brush motor 540.

The controller 610 is provided with a trigger circuit, and after the user turns on the power switch key, the trigger circuit starts a battery signal, so that the battery pack 520 is activated.

The controller 610 has a data interface with the cleaner display 110, the battery pack 520, the cleaning motor 530, the floor brush motor 540, and the power control device 420, and communicates through the data interface.

The battery pack 520 provides electric quantity for the dust collection motor 530, the floor brush motor 540 and the power control device 420, an interface protocol is arranged between the battery pack 520 and the controller 610, and the interface protocol adopts an open protocol to meet the requirement of communication with the controller 610; the interior of the battery pack 520 can be freely designed, the battery pack 520 can adopt battery packs of different manufacturers or battery packs of different types, and the shape of the battery pack can be changed according to dust collectors of different shapes; after obtaining the power information of the battery pack, the controller 610 performs corresponding processing on the battery power information and transmits the processed battery power information to the dust collector display device 110, and the processed battery power information is displayed by the battery power display portion 113 of the dust collector display device 110.

The power control device 420 is connected to the controller 610 through a data interface, and after the controller 610 obtains power information of the cleaner, the motor power information of the cleaning motor 530 is transmitted to the cleaner display device 110 and displayed through the power display part 114 of the cleaner display device 110. The interface protocol also adopts an open protocol, which is sufficient for communication with the controller 610, and the interface protocols appearing hereinafter have the same meaning unless otherwise specified.

The vacuum cleaner display system 100 of the present application is described below. As described above, the cleaner display system 100 includes a portion of the cleaner controller related to display control, and the display device 110. The display device 110 is mainly described below.

Referring to fig. 3, 4 and 5, fig. 3 is a logic block diagram of a display device of a vacuum cleaner according to the present application; FIG. 4 is a schematic view of a display device of the vacuum cleaner displaying information; fig. 5 is an enlarged view of the position B in fig. 4.

The application provides a dust catcher display device is applied to in the dust catcher for parameter information to the dust catcher during operation shows, the parameter information of dust catcher can be for one or several kinds among power information, battery power information, communication information, fault information or dust concentration information. The dust collector display device is generally arranged on a surface which is easy to observe in the working state of the dust collector, such as an upward surface, so that a user can know the change of parameter information at any time when using the dust collector, and the using state of the dust collector is effectively judged. According to the shape of the dust collector, the shape of the display device of the dust collector can be set to be corresponding, such as circular, rectangular or heart-shaped, which is not limited.

In this embodiment, the dust collector display device 110 at least includes: a light emitting display unit 111, a driving unit 112; the battery management system may further include a display screen 115, and the display screen 115 may be provided with a battery level display unit 113, a power display unit 114, a communication display unit (not shown), and a failure display unit (not shown). The light emitting display unit 111 may be separately disposed or disposed integrally with the display screen 115, in some preferred embodiments, the light emitting display unit 111 and the display screen 115 are integrally designed, and the display device may be any one of a LED lamp, an LCD, an OLED, a display with a touch function, and the like. Of course, according to the specific requirements of different models of vacuum cleaners, one or more of the light-emitting display unit 111, the battery level display portion 113, the communication display portion (not shown) and the fault display portion (not shown) or the power display portion 114 can be selected according to the parameter information required to be displayed, and other components can be omitted.

In the embodiment, the communication display part is used for displaying the communication state of the display device, and different communication states are displayed by different patterns; the communication can be in a wired communication mode or a wireless communication mode; specifically, the communication between the display device and the dust collector may be performed, and the communication between the display device and the intelligent terminal may also be performed. The fault display part is used for displaying fault information of the dust collector, the fault information can be any fault information which occurs in the operation process of the dust collector, the fault information comprises fault information such as rolling brush blocking, dust collection pipeline blocking, dust sensor faults and the like, and different fault information can be displayed by different characters and/or patterns.

Wherein, the light-emitting display unit 111 is used for displaying dust concentration information of the dust collector; the driving unit 112 is configured to receive a first display instruction corresponding to a set measurement parameter measurement value from the controller 610, and provide a driving signal to the light-emitting display unit 111, so that the light-emitting display unit 111 presents different light-emitting states according to a specific value of the first display instruction, thereby displaying dust concentration information.

The battery power display part 113 is used for displaying the battery power information of the current state of the dust collector; the power display part 114 is used for displaying the power information of the current dust collection motor 530 of the dust collector. The display screen 115 and the controller 610 have an interface protocol, and after the interface protocol is defined, the display screen of different models, different manufacturers or different shapes can be applied to the dust collector display device 110 in the embodiment of the present application.

The light-emitting display unit 111 is composed of a plurality of light-emitting devices arranged according to a set order, is arranged on the surface of the dust collector, and is generally used for displaying most concerned dust concentration information because the display content of the light-emitting display unit 111 is more obvious, and certainly is not excluded from displaying other information.

The light emitting devices may be a plurality of LED (light emitting diode) lamps, and the arrangement of the light emitting devices in a set order means that the light emitting devices are arranged in a certain shape and order, specifically, may be one of a geometric distribution, a character distribution or a pattern, and a typical arrangement manner of the geometric distribution is that a plurality of LEDs are arranged in a circular ring shape.

The present embodiment will be described by taking an example in which the light emitting devices are LEDs, and the light emitting devices are arranged in a circular ring shape in this order. The LED lamp may comprise two colors arranged alternately or side by side. For example, the LED lamp is a red-blue two-color lamp; in this embodiment, the LED lamps are used for displaying dust concentration information of the dust collector, each LED lamp displays one color at any time when the dust collector operates, the dust amount changes with the increase of the operating time of the dust collector corresponding to the detection result of the dust state of all the LED lamps, and the light-emitting display unit 111 displays the change of the dust concentration, so as to remind a user to perform corresponding operations in different states according to the display effect when the dust collector is used.

The light emitting device can emit light when the driving unit 112 provides electric driving (current or voltage). The light emitting display unit 111 provides corresponding display information to the outside by one or more factors of the light emitting number, the light emitting position and the light emitting manner of the light emitting device; in this embodiment, the dust concentration information is provided.

The driving unit 112 receives a first display instruction corresponding to a set measurement value of the measurement parameter provided by the controller 610, and generates a corresponding electric driving signal, i.e. a suitable current or voltage, according to a specific value of the first display instruction, so as to drive the corresponding light emitting device of the light emitting display unit 111 to emit light as required. That is, the controller 610 forms a corresponding first display instruction according to the dust concentration detection value provided by the dust detection system 200, and the driving unit 112 generates a suitable current or voltage according to the value of the first display instruction, and drives the light emitting devices in a suitable number, color and position to emit light, so as to provide the detection information of the dust concentration to the user. In the present embodiment, the light-emitting display unit 111 includes light-emitting devices of two colors as an example, where more light-emitting devices of a first color are lit indicates a lower dust concentration; the more the light emitting devices of the second color light up, the higher the dust concentration is indicated.

It is hereinafter assumed that the light emitting devices of the light emitting display unit employ circularly arranged LED lamps and have two colors, for example, red and green, and the LED lamps of the two colors are arranged alternately or side by side. In the case of the light-emitting display unit of the above-described form, a specific display mode for displaying the dust concentration using such a light-emitting display unit will be described below; please refer to fig. 4.

When the dust concentration is equal to or less than the lowest threshold, the light emitting devices of the first color are all turned on, and the light emitting devices of the second color are all turned off, see the case shown in a 1; the lowest threshold value is a threshold value set for the dust collector according to the working environment condition of the dust collector, and the numerical value reflects the condition that the dust concentration is very low; if the dust concentration is below this threshold, the cleaner is operating in a very clean state and the suction motor can be run at the lowest power or speed.

When the dust concentration is equal to or higher than the highest threshold, all the light emitting devices of the first color are turned off, and all the light emitting devices of the second color are turned on, see the case shown in a 2; the highest threshold is a threshold set for the dust collector according to the working environment condition of the dust collector, and the value reflects the condition that the dust concentration is very high; if the dust concentration is higher than the threshold value, the cleaner operates in a state of very much dust, and the suction motor should be operated at the maximum power or the maximum rotation speed. At this time, all the light emitting devices of the second color are turned on, and the user can be prompted to take measures.

When the dust concentration is between the lowest threshold and the highest threshold, the light emitting device is lit in the following manner: starting from the circular ring setting starting point, proportionally lightening a second color light-emitting device with a corresponding radian according to the size of the specific numerical value; the remaining arc range then illuminates the light emitting device of the first color, see the situation shown at a 3.

In another optional embodiment, the light emitting device LED lamp displays dust concentration by using a monochromatic lamp, specifically:

when the dust concentration is equal to or less than the lowest threshold, the light emitting devices of the first color are all turned off, see the case shown in a 1;

when the dust concentration is between the lowest threshold and the highest threshold, the number of the light emitting device parts of the first color is lightened according to the specific numerical value of the first display instruction, and the dust concentration is displayed in an arc-shaped lamp strip manner, as shown in a 3; the radian range of the arc-shaped lamp strip shows the dust concentration.

When the dust concentration is equal to or higher than the highest threshold, the light emitting devices of the first color are all lit, and the dust concentration is displayed in a ring-shaped light bar, see the case shown in a 2.

In another optional embodiment, the LED lamp displays the dust concentration by using a two-color lamp, specifically:

when the dust concentration is equal to or less than the lowest threshold, the light emitting devices of the first color are all turned on, and the light emitting devices of the second color are all turned off, see the case shown in a 1;

when the dust concentration is equal to or higher than the highest threshold, all the light emitting devices of the first color are turned off, and all the light emitting devices of the second color are turned on, see the case shown in a 2;

when the dust concentration is between the lowest threshold and the highest threshold, the light emitting device is lit in the following manner: starting from the circular ring setting starting point, proportionally lightening a second color light-emitting device with a corresponding radian according to the size of the specific numerical value; the remaining radian range lights the light emitting device of the first color, and the light emitting device of the first color and the light emitting device of the second color are crossed by a certain number of light emitting devices for overlapped display, so that the effect of color gradient is presented, as shown in a 4.

In still another optional embodiment, the LED lamp displays the dust concentration by using a two-color lamp, specifically:

when the dust concentration is less than or equal to a set threshold, all the light-emitting devices of the first color are turned on, or all the light-emitting devices of the first color are displayed in a breathing state (namely, flash display) and all the light-emitting devices of the second color are turned off;

when the dust concentration is greater than or equal to the set threshold, the light emitting devices of the second color are all lighted, or the light emitting devices of the second color are displayed in a breathing state (namely, in a flashing display), and the light emitting devices of the first color are all extinguished.

The working condition of the dust collector display device in the embodiment of the application is that a user presses a power switch button, a trigger circuit is started, a battery starting signal is given, a ground brush motor works according to a preset gear, the driving unit 112 provides current or voltage to drive the light-emitting display unit 111 to emit light, and the light-emitting state of the light-emitting display unit 111 when the power supply is started correspondingly displays the current dust concentration; the controller receives the changed dust concentration information along with the change of the sucked dust concentration, performs corresponding processing, enables the driving unit 112 to receive the first display instruction, performs corresponding light emission according to any light emission mode, and displays the changed dust concentration corresponding to the light emission state of the light emission display unit 111 at the moment.

The dust collector display device 110 provided by the embodiment of the application adopts the light emitter assemblies arranged according to the set sequence, and provides a first display instruction corresponding to the set measurement parameter through the controller, so that the driving unit drives the light emitting device to emit light as required, the effect of displaying the actually measured parameter information of the dust collector according to the light emitting state of the light emitter assemblies is realized, due to the control of the first display instruction, the number of the display states of the light emitter assemblies is enlarged, further the display range of the parameter information of the dust collector is enlarged, when the dust collector display device is applied to the display of dust concentration, different dust concentrations can be displayed, and the dust collector display device is used for reminding a user to perform subsequent operation control on the dust collector according to the current dust concentration information.

Besides the light emitting display unit 111, the display device 110 may further include a display screen 115, in this embodiment, the display screen 115 is disposed at a central position of the circularly arranged LED lamps; the display screen 115 may be provided with related display items as required, and in this embodiment, the display screen 115 is provided with a battery level display portion 113, a power display portion 115, a communication display portion (not shown) and a fault display portion (not shown). In the prior art, the display screen 115 may be implemented in various manners, such as an LCD screen, an OEDL display screen, or other touch-control display screens.

The battery power display part 113 displays the number representing the battery residual power according to the battery residual power value provided by the dust collector power management element by the battery power display part 113. Specifically, in the discharging or charging process of the wireless dust collector, the battery pack 520 is in real-time communication with the controller 610, after battery power data transmitted by the battery pack 520 is obtained, the controller 610 is in communication with the display screen 115 again, display driving information corresponding to the battery power is provided for the display screen 115, finally the display screen 115 performs corresponding display according to the display driving information, the residual power of the battery pack 520 is displayed in real time, the power is displayed in percentage, and the display range is 0-100.

Optionally, the battery power display portion 113 includes a battery icon 113-1, and when the power is greater than a specific value, the battery icon 113-1 changes to a specific color (for example, green) to indicate that the power is sufficient; when the charge is less than a certain value, the battery icon 113-1 changes to another certain color (e.g., red) to indicate that the charge is insufficient, and thus, the user is alerted to charge.

Referring to fig. 5, a power display part 114 for displaying power is provided on the display screen 115; the power display part 114 displays corresponding power according to the working power of the motor of the dust collector. The power display part 114 adopts equally spaced vertical lines or dots between the set starting position and the set end position to mark the working power of the motor of the dust collector; at maximum power, all vertical lines or dots between the starting position and the end position are displayed; and under other powers, displaying a corresponding number of vertical lines or circular dots from the starting position to the end position according to the power.

Specifically, a low power icon is placed on the left side of the display screen 115, a high power icon is placed on the right side, and a power bar is placed in the middle. The big power icon can place any icon as long as it represents the power size. The middle power bar may be any line, dot, pattern, or the like.

The following are several possible methods shown:

when the power is minimum, the low-power icon is displayed, and the other icons are not displayed.

And secondly, when the power is minimum, displaying one or more power bars on the small-power icon, and not displaying the other power bars.

And thirdly, when the power is increased, the power bar graph marks are synchronously increased with the power of the machine to display the length, and the rest of the power bar graph marks are not displayed.

And fourthly, when the power is increased, the displayed power bar corresponds to the power of the current machine, and the rest of the power bar is not displayed.

When the power is maximum, the power bar is displayed fully, the high-power icon is displayed, and the others are not displayed.

When the power is maximum, the high-power icon is displayed, and the other icons are not displayed.

The light emitting display unit 111 formed by the circular ring-shaped LEDs and the scheme of arranging the display screen 115 in the center of the display device 110 may be configured with a circular transparent cover plate with a corresponding size according to the area size of the circularly arranged LED lamps, so as to protect the display device 110.

In another embodiment of the present invention, the display device 110 includes a driving unit 112 and a display screen 115, the display screen 115 is an integrated display, and the display simultaneously displays one or more of power information, battery level information, communication information, fault information or dust concentration information, and the driving unit 112 is used to drive the display to display corresponding information. In this embodiment, the display screen 115 is a liquid crystal display or an OLED display, the driving unit 112 outputs a corresponding signal to the display screen 115 in response to a signal from the vacuum cleaner control system, and the display screen 115 displays one or more of power information, battery level information, communication information, fault information, and dust concentration information. In combination with a vacuum cleaner, the display device 110 can be arranged at the top end of a dust barrel and a cyclone separator of the vacuum cleaner, the drive unit 112 of the display device is in wired communication connection with a control system of the vacuum cleaner, and a circular display screen is used, so that the display effect of the display device is better, and the user experience of the vacuum cleaner is improved.

The display device of the dust collector provided by the embodiment has the following beneficial effects:

the light emitting device assemblies are arranged according to the set sequence, the controller provides a first display instruction corresponding to the set measurement parameters, the driving unit drives the light emitting device to emit light as required, the effect of displaying the actually measured parameter information of the dust collector according to the light emitting state of the light emitting device assemblies is achieved, the number of the display states of the light emitting device assemblies is increased due to the control of the first display instruction, the display range of the parameter information of the dust collector is further increased, different dust concentrations can be displayed when the dust concentration display device is applied to dust concentration display, and the dust collector can be reminded of performing subsequent operation control on the dust collector according to the current dust concentration information.

The dust detection system 200 of the present application is described below. As described above, the dust detection system 200 includes the part of the controller in the control system 600 related to the dust detection control, and the dust detection device 210.

In this embodiment, the vacuum cleaner includes a dust detection device 210, a main control panel, a dust barrel, an air duct, and a switching tube communicating the dust barrel and the air duct, wherein the dust detection device includes a sensor 211, a transparent window 212, and a sensor circuit 213. The sensor includes: the transmitter 211-1 and the receiver 211-2 are symmetrically arranged in the adapter tube, and a light path passing through the adapter tube is formed between the transmitter 211-1 and the receiver 211-2; the transparent window 212 is arranged on the pipe wall part of the light path passing through the adapter tube; the sensor 211 transmits the detection signal obtained by the sensor circuit 213 to the main control board; and the main control board calculates the dust condition according to the detection signal.

Please refer to fig. 6, 7 and 8; FIG. 6 is a schematic circuit diagram of a dust detection apparatus according to an embodiment of the present application; FIG. 7 is a schematic view showing an installation structure of the transmitter and the receiver according to the present embodiment; FIG. 8 is a schematic view of a dust detecting apparatus detecting dust;

referring to fig. 2, 6 and 7, the dust detecting device 210 includes: a sensor 211, a transparent window 212, and a sensor circuit 213.

As shown in fig. 7, the sensor 211 is disposed in an adapter tube that connects the duct tube and the dust barrel, two transparent windows 212 are respectively embedded in the tube wall of the adapter tube, the adapter tube is semicircular, one of the transparent windows 212 is clamped on the vertical tube wall of the semicircular adapter tube, the other transparent window 212 is disposed on the arc-shaped tube wall of the adapter tube, a part of the tube wall protrudes outward to form an opening on the arc-shaped tube wall, the transparent window 212 extends into the opening to be fixed, and the sensor 211 is located near the dust suction port to detect the amount of dust; the sensor 211 includes: the emitter 211-1 and the receiver 211-2 are symmetrically arranged on a passage through which dust flows, and a light path passing through the adapter tube is formed between the emitter 211-1 and the receiver 211-2; the transparent window 212 is arranged on the wall portion of the light path passing through the adapter tube, and the transparent window 212 made of transparent material can effectively pass the light beam emitted by the emitter 211-1 and be received by the receiver 211-2.

The adapter tube may be configured to have a tube wall portion extending into the dust barrel or the air duct tube, and correspondingly, the sensor 211 may be configured on the tube wall of the dust barrel or the air duct tube corresponding to the tube wall portion.

The transmitter 211-1 and the receiver 211-2 are connected to the controller 610 through the sensor circuit 213, a main control board (hereinafter referred to as a main control board) included in the controller 610 is provided with a reference signal input terminal, a transmitter control terminal and a detection signal input terminal, respectively, the transmitter 211-1 is connected to the transmitter control terminal through a signal, the receiver 211-2 is connected to the reference signal input terminal, and the receiver 211-2 is further connected to the detection signal input terminal of the main control board through the sensor circuit 213 through a signal.

When detecting the amount of dust, the receiver 211-2 receives the optical signal from the transmitter 211-1 and outputs a detection signal corresponding to the amount of received light. The detection signal of the receiver 211-2 is changed into pulse or square wave after passing through the sensor circuit 213, and is input into the main control board through the detection signal input end. According to the number of the pulses or the square waves detected by the main control board, the number of the dust can be obtained, namely the larger the number of the pulses is, the larger the number of the dust is, and the smaller the number of the pulses is, the smaller the number of the dust is. In addition, the larger the particle size of the dust, the wider the width of the pulse, and the smaller the particle size of the dust, the smaller the width of the pulse.

The main control board is preset with an electrical signal preset value, which is a reference voltage value, and can also be represented by current, light intensity and pulse, the setting of the reference voltage value is related to the sensitivity of the sensor 211, and the specific determination mode is obtained by detecting the detection signal of the receiver 211-2 in the calibration environment. The calibration environment is a normal environment in which the dust collector does not work and is in a cleaner environment.

The adjustment of the sensitivity of the dust detection apparatus will be described below.

Referring to fig. 8, normally, during a dust suction process, when dust flows through the dust channel, a part of light emitted from the emitter 211-1 is blocked by the dust, and the light receiving amount of the receiver 211-2 is reduced. The detection signal of the receiver 211-2 is input into the main control board through the reference signal input terminal, and the main control board receives a normal electrical signal value.

In the dust detection process, if dust adheres to the surface of the emitter 211-1, part of the light emitted by the emitter 211-1 is blocked by the dust adhering to the surface of the emitter 211-1 before reaching the dust surface in the dust channel, so that the light receiving amount of the receiver 211-2 is reduced compared with the normal case.

The sensitivity of the sensor is adjusted by setting a preset value in a main control board, and the main control board compares the electrical signal value received by the reference signal input end with the preset value in the main control board, and adjusts the power supply to the control end of the transmitter 211-1 according to the comparison result of the two values to adjust the luminous intensity of the transmitter 211-1 until the difference value between the electrical signal value obtained by the reference signal input end and the preset value is within a predetermined threshold range. There are various specific adjustment methods, and this embodiment provides a specific implementation scheme, which is described in detail in the subsequent section.

The threshold range is reasonably set according to the size of dust particles and the amount of dust corresponding to different conditions in the working environment of the dust collector, and the luminous intensity of the emitter 211-1 is adjusted by adjusting the driving voltage of the emitter 211-1 to increase or decrease the luminous intensity.

Optionally, the preset value can be adjusted according to environmental requirements before dust collection operation. In addition, the preset value can also be calibrated in real time during the dust-collecting operation, as described below:

and the main control board calibrates the preset value according to the detection signal obtained by the detection signal input end and the dust particle value or the dust concentration value so that the preset value is close to or the same as the analog signal value.

Optionally, the main control board obtains the dust concentration value in the following manner: and calculating the dust concentration value according to the number of square waves in unit time in the detection signal.

Optionally, the main control board calculates the size of the dust particles by counting the width of the square wave appearing in the detection signal.

Optionally, as shown in fig. 6, the dust detecting device 210 further includes: the motor module 214, the motor module 214 is connected with the motor control output port of the controller 610, and adjusts the power of the dust collection motor or the rotating speed of the motor according to a given value provided by the motor control output port; and after the main control board calculates the dust condition according to the detection signal, substituting the obtained dust condition into a given value calculation method arranged in the main control board to obtain a given value provided by a control output port of the dust collection motor.

The dust detection device comprises a transparent window 212, wherein the transparent window 212 provides a passing path between an emitter 211-1 and a receiver 211-2 of the sensor 211, so that the dust concentration is measured at the position of the adapter tube; however, since the vacuum cleaner is operated in a dusty environment, the transparent window 212 is quickly contaminated with dust and the transparency thereof is rapidly reduced during the use of the vacuum cleaner, so that the dust detection apparatus cannot accurately measure the dust condition. In order to solve the above problem, in the present embodiment, a special scraping bar is further disposed on the transparent window 212 for cleaning the transparent window 212.

Please refer to fig. 9, which is a schematic diagram of a bar scraping mechanism of the dust detecting device of the present application.

The bar scraping mechanism comprises: the scraper bar 215 and the scraper bar baffle 216, the scraper bar baffle 216 is fixed at both ends of the transparent window 212, the scraper bar 215 is arranged between the scraper bar baffles 216, and can move between the scraper bar baffles 216 in a mode of adhering to the surface of the transparent window 212; the surface to which the transparent window 212 is attached is a surface that is easily contaminated, or a scratch strip 215 is provided on both surfaces of the transparent window 212.

Accordingly, in order to drive the wiper blade 215, the wiper blade mechanism further includes a wiper blade motor (not shown), and a wiper blade motor control unit (not shown); the rotation of the scraping bar motor drives the scraping bar to move through a mechanical mechanism; the bar scraping motor control unit is used for controlling the rotation of the bar scraping motor.

The rotation of the wiper blade motor includes forward rotation and reverse rotation, which are converted into movement of the wiper blade 215 in both the left and right directions by the mechanical mechanism. The bar scraping motor and the mechanical structure thereof can be realized in various ways; for example, the scraper motor may adopt a commonly used small-sized direct current motor, and the mechanical mechanism may adopt a small-sized lead screw; one end of the scraping bar 215 is provided with an internal threaded hole which is in sleeved fit with the lead screw, and the scraping bar moves along the axis of the lead screw along with the rotation of the lead screw driven by the scraping bar motor, so that the scraping bar 215 is attached to the surface of the transparent window 212; when the bar motor changes the direction of rotation, the bar 215 may move in the opposite direction. Of course, there are many possible technical solutions for implementing the movement of the wiper blade 215 driven by the wiper blade motor, and the detailed description thereof is omitted here.

Optionally, the bar scraping motor control unit includes a circuit for supplying power to the bar scraping motor, and a control program on the main control board for controlling the circuit; the bar scraping motor needs to be continuously switched between forward rotation and reverse rotation according to the situation, so that an H-bridge circuit which is easy to change the power supply direction of the direct current motor can be adopted as a circuit for supplying power to the bar scraping motor, and the bar scraping motor is specifically shown in fig. 10. The controller 610 controls the start and stop of the bar scraping motor, and the forward rotation and the reverse rotation by controlling the conduction and the conduction direction of the H-bridge circuit.

Please refer to fig. 10, which is a schematic diagram of a control circuit of the transparent window bar scraping mechanism of the present application; the principle of the circuit for wiping the transparent window is explained below.

The control circuit main body of the bar scraping mechanism is an H-bridge circuit; the circuit consists of four controllable silicon or high-power triodes of Q1, Q2, Q3 and Q4.

When the Q1 and the Q4 are controlled to be turned on and the Q2 and the Q3 are controlled to be turned off, the bar scraping motor rotates forwards, and when the Q1 and the Q4 are controlled to be turned off and the Q2 and the Q3 are controlled to be turned on, the bar scraping motor rotates backwards. The control of the Q1-Q4 is realized by the control voltage output by the output port of the control end of the main control board, and how the output port outputs the control voltage is realized by an internal control program.

A scraping bar baffle 216 is respectively arranged at two sides of the transparent window 212 for limiting, when the motor-controlled scraping bar motor rotates forwards, the scraping bar 215 moves towards one direction, for example, moves from left to right, because the bottom surface of the scraping bar 215 is attached to the transparent window 212, the scraping bar 215 starts to clean dirt on the surface of the transparent window 212, when the scraping bar 215 touches the scraping bar baffle 216, the scraping bar 215 is blocked, the rotation of the scraping bar motor is blocked, so that the current passing through the resistor R1 is obviously increased, at the moment, when the main control board detects that the current passing through the resistor R1 is increased, the rotation direction of the scraping bar motor is switched according to the setting of an internal control program, so that the scraping bar 215 moves towards the opposite direction; similarly, when the bar 215 touches the bar baffle 216 on the other side, the direction is reversed again, and the transparent window 212 is cleaned up in such a reciprocating manner.

As can be seen from the above working principle, in order to control the reciprocating motion of the wiper blade 215, a current detection module is required to be arranged for detecting the current flowing through the wiper blade motor; when the current of the bar scraping motor is larger than a specified threshold value, the detection value output by the current detection module enables the main control board to control the switching of the rotation direction of the bar scraping motor.

In the circuit shown in fig. 10, the resistor R1 and a mechanism for detecting a current flowing through the resistor R1 constitute the current detection module. The specific principle of the circuit for realizing current detection is as follows: the voltage value of the anode of the resistor R1 is introduced into one input port of the main control board, the main control board can calculate the current value flowing through the resistor R1 according to the voltage value accessed by the input port, if the voltage value of the anode of the resistor R1 is higher than a threshold value set inside the main control board, it can be judged that the current flowing through the resistor R1 is too high, which indicates that the movement of the bar wiper 215 is blocked by the bar wiper baffle 216, and the main control board changes the conduction state of the H-bridge circuit by changing the output value of the output port of the control end of the main control board connected with the Q1-Q4, so that the rotation direction of the bar wiper motor is changed, and the reciprocating movement of the bar wiper 215 is realized.

The time for starting the bar scraping mechanism can be judged according to the control of the sensor and the signal receiving condition; for example, when the transmitter 211-1 is powered by the main control board with the current or voltage required by the maximum emission intensity, and the receiver 211-2 still cannot receive a stable signal, the bar scraping mechanism needs to be activated to operate, so as to clean the transparent window 212. After a period of cleaning, a specific cleaning time can be preset with a time parameter, if the receiver 211-2 can smoothly obtain a stable signal, it indicates that the infrared signal can be normally transmitted, and the bar scraping mechanism stops operating.

Set up above-mentioned dust detection device, have following beneficial effect:

(1) the dust detection device is arranged outside the switching pipe for communicating the dust barrel of the dust collector with the air duct pipe, the dust signal is detected from the position near the inlet of the dust suction dust collector, the current dust concentration is accurately collected, the large-particle dust is identified, the dust overstock of the transmitting end and the receiving end of the dust detection device is reduced through the protection of the transparent window, the sensitivity reduction in the use process of the dust sensor is avoided, and the dust concentration detection precision is improved.

(2) With the pipe wall part of sensor setting at dirt bucket or wind channel pipe, realized that the dust sensor can not obstruct the technological effect of the air inlet in wind channel to combine the setting of transparent window, realized carrying out the technological effect that detects to dust concentration.

(3) Through setting up the scraping strip and scraping the strip baffle to can clean transparent window, make the light path between sensor transmitter and the receiver can not sheltered from, improve the sensitivity of receiving dust detection signal.

The air pressure detection protection system 300 of the present application is described below.

The embodiment of the application provides a dust collector air pressure detection protection system, solves the technical problem that the change of air pressure in a dust collector in the prior art can not feed back the actuating elements of the dust collector such as a motor and a display element, and realizes effective protection of the dust collector by performing different control on related actuating elements when the critical value is touched through comparing the air pressure value with a preset critical value.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

the air pressure value detected by the air pressure detection module is input into a comparator, a critical value for controlling each execution element is preset in the comparator, and the corresponding execution element is controlled to perform corresponding control by judging whether the detected air pressure value reaches a certain range of the critical value. The air pressure detection module can be arranged at different positions of the dust collector and can be controlled differently according to detection results of different positions.

For better understanding of the above technical solutions, the following technical solutions will be described with reference to the drawings and specific embodiments of the specification.

Please refer to fig. 11, which is a logic block diagram of a vacuum cleaner air pressure detection protection system according to an embodiment of the present application.

The dust collector air pressure detection and protection system 300 of the embodiment of the application includes an air pressure detection module 310, a first converter 621, a comparator 320, and a first controller 611.

The air pressure detection module 310 is arranged at an air pressure sensitive position of the dust collector. The air pressure sensitive position of the dust collector comprises a main suction port position, a dust barrel position, an air outlet position and a motor inner cavity position, and the air pressure detection module 310 can be arranged in one of the positions or can be arranged in all the positions. The air pressure detection module 310 obtains air pressure sampling through a sampling air pipe communicated to the air pressure sensitive position of the dust collector, and the air pressure detection module 310 detects the air pressure value of the air pressure sensitive position of the dust collector in real time during the operation of the dust collector and converts the air pressure value into an electric signal. The air pressure detecting module 310 may be implemented in various ways, and various pressure sensor chips for measuring air pressure exist in the prior art, and may be selected according to the situation.

The first converter 621 is disposed in the vacuum cleaner and in signal connection with the air pressure detection module 310, and the first converter 621 receives the electrical signal of the air pressure detection module 310 and converts the electrical signal into a digital signal reflecting an air pressure value. The air pressure detecting module 310 and the first converter 621 may be implemented in various ways, and in the prior art, there are various air pressure detecting integrated circuits including an air pressure sensor and a signal processing circuit for measuring air pressure, which may be selected according to situations. These chips actually integrate the air pressure detection module 310 and the first converter 621, so as to realize air pressure detection and output a digital signal reflecting an air pressure value, which can be received by the controller main control board.

The comparator 320 is disposed in the controller, and is in signal connection with the first converter 621, and is configured to receive the digital value provided by the first converter 621 and reflecting the air pressure value, and compare the digital value with each preset threshold value of the comparator 320 to obtain a corresponding comparison result.

The first controller 611 is generally a part of the controller 610 related to the air pressure detection and the control performed according to the air pressure detection, and may of course be a separately established control unit, and may be implemented by a related control program in the controller 610, stored related parameter information, and an operation unit running the related control program; the first controller 611 is used herein for independent explanation thereof. The first controller 611 is configured to receive the comparison result output by the comparator 320, and output a corresponding control command to each actuator of the vacuum cleaner according to the comparison result. The execution element comprises a display unit, a dust collection motor and an alarm element.

In the case that the first converter 621 outputs already digital values, the comparator 320 may actually compare the air pressure detection value provided by the first converter 621 with the critical value data pre-stored in the storage unit of the main control board (i.e., the MCU chip with operation and storage functions) included in the first controller 611, and the comparison process may be implemented by using the operation function provided by the main control board. The comparison result is provided to the first controller 611, and the first controller 611 can control the related actuator according to the comparison result and a preset program.

Please refer to fig. 12, which is a flowchart illustrating the operation of the controller according to the embodiment of the present application; it should be noted that the flowchart is only a schematic flowchart provided according to a specific embodiment, where several determination steps are provided in a logically non-sequential order, that is, the order of steps S110, S120, S130, and S140 provided in the flowchart of fig. 12 may be arbitrary or may be completely concurrent; the above steps S110, S120, S130, and S140 may be performed in any one or more steps, but not all of them.

Depending on whether the detected air pressure reaches a specific threshold, the first controller 611 may select to control one or more of the actuators and not control other actuators.

S110: the detected air pressure value is lower than the lowest allowable threshold value, and the first controller 611 issues a control command for stopping the dust collection motor and a control command for starting the alarm to the alarm component corresponding to the comparison result.

The air pressure value detected in the step is lower than the lowest allowable threshold value, which indicates that outside air is difficult to enter, and the air path is seriously blocked, for example, any part of an air inlet duct or a dust collection channel is blocked, and if the condition lasts for a long time, the dust collection motor generates heat due to overlarge resistance, and the motor and plastic elements of the dust collector are possibly burnt out; for this reason, a shutdown and an alarm are required.

If the detected air pressure value is higher than the maximum allowable threshold value, the first controller 611 issues a control command for stopping the dust collection motor and a control command for alarming the alarm element to start, corresponding to the comparison result.

The air pressure value detected in the step is higher than the highest allowable threshold value, which indicates that the air in the dust collector is difficult to get out, and the air path is seriously blocked, for example, the air outlet channel or the air outlet is blocked, and if the situation lasts for a long time, the dust collection motor generates heat due to excessive resistance, and the motor and the plastic elements of the dust collector can be burnt out; for this reason, a shutdown and an alarm are required.

S120: detecting that the obtained air pressure value is higher than the lowest allowable threshold value and lower than a normal value, and in response to the comparison result, the first controller 611 sends a control command for increasing the operation power to the dust collection motor;

when the detected air pressure value is higher than the lowest allowable threshold value and lower than the normal value, the air inlet path resistance is too large, but the normal working state of the dust collector can be recovered by increasing the suction force, and in this case, a control instruction for increasing the running power can be sent to the dust collection motor until the air pressure value is normal.

Detecting that the obtained air pressure value is lower than the maximum allowable threshold value and higher than a normal value, and in response to the comparison result, the first controller 611 issues a control command to reduce the operation power to the dust collection motor; and when the detected air pressure value reaches a normal value, the controller controls the dust collection motor to recover to normal work again.

When the detected air pressure value is lower than the maximum allowable threshold value and higher than the normal value, the situation shows that the resistance of the air outlet path is too large, but the normal working state of the dust collector can be recovered by reducing the suction force, and in this situation, a control instruction for reducing the running power can be sent to the dust collection motor until the air pressure value is normal.

And when the detected air pressure value reaches a normal value, the controller controls the dust collection motor to recover to normal work again.

S130: the air pressure value detected by the filter element position is lower than the set filter element replacement prompting threshold, and the first controller 611 controls the output element to send out prompting information that the filter element needs to be replaced corresponding to the comparison result.

The step is carried out according to the detection result of the air pressure value of the position of the filter element; when the air pressure value at the filter element position is too low, it indicates that the dust accumulated in the filter element is too much and needs to be replaced, at this time, the first controller 611 may send a control instruction to the output device to prompt the replacement of the filter element, and the output device sends a prompt; the specific prompting mode can be realized according to the output mode of the dust collector, for example, the dust collector with the display screen can display through the display screen, the dust collector with the voice prompting function can prompt through voice, and the prompting mode can also prompt according to the state of an LED lamp arranged on the surface of the dust collector.

S140: the air pressure value at the position of the dust barrel or the motor cavity is lower than a set dust barrel dust full threshold, and the first controller 611 controls the output element to send out a prompt message that the dust needs to be cleaned corresponding to the comparison result.

In this step, a detection result of the air pressure detection value at the position of the dust barrel is utilized, and when the detection result is lower than a set dust full threshold of the dust barrel, it indicates that the dust accumulated in the dust barrel is too much and needs to be cleaned, and the first controller 611 controls the output element to send out a prompt message that the dust needs to be cleaned.

A specific example is described as follows:

minimum allowable threshold	Filter element prompt threshold	Dust bucket dust full threshold	Normal value
				20	40	60	90

When the detected air pressure value is 10, prompting the motor to stop and sending an alarm signal;

when the detected air pressure value is 30, controlling the motor to increase power;

when the detected air pressure value of the filter element position is 40, prompting the filter element to be replaced;

when the detection air pressure value of the position of the dust bucket is 60, the fact that the dust bucket is full of dust is prompted, and the dust in the dust bucket needs to be cleaned.

Because the atmospheric pressure detected value of different positions can be obtained through sampling of atmospheric pressure sampling trachea to multiple reliable cheap atmospheric pressure detection chip has been provided under the prior art, consequently, can set up a plurality of detection positions for a dust catcher, and specifically set up different critical values according to the condition of different detection positions, realize different control effects.

The throttle control system 400 of the present application is described below.

Referring to fig. 13, it is a logic block diagram of the vacuum cleaner speed regulation control system provided in this embodiment.

The present embodiment provides a speed control system 400 for a vacuum cleaner, which comprises: the touch sensing element 410, the power control device 420, the second controller 612, and the second converter 622.

The touch sensing member 410 is disposed on a surface of the cleaner housing, and the touch sensing member 410 is configured to receive touch control and generate a touch sensing electrical signal according to a state of the touch control.

The second converter 622 receives the touch-sensitive electrical signal and converts it into a power indication signal or a rotational speed indication signal that can be recognized by the second controller 612.

The second controller 612 receives the power indication signal or the rotation speed indication signal, and generates a power setting signal corresponding to the power indication signal or a rotation speed setting signal corresponding to the rotation speed indication signal under the control of the internal control element.

The power control device 420 is used for controlling the motor of the dust collector to move at the power given by the power given signal or at the rotating speed corresponding to the rotating speed given signal according to the power given signal or the rotating speed given signal.

The embodiment can be applied to a handheld wireless dust collector or a traditional AC dust collector, if a wireless dust collector is adopted, the corresponding motor is a dc motor, and the corresponding power control device is a MOS (metal) -oxide-semiconductor (semiconductor) field effect transistor or an igbt (insulated Gate Bipolar transistor), that is, an insulated Gate Bipolar transistor; if an AC dust collector is adopted, the corresponding motor is a series motor, and the corresponding power control device is a silicon controlled rectifier. The touch sensing member may be an FPC touch film, and the sensed touch sensing electrical signal is a capacitance signal.

The dust collector speed regulation control system provided by the embodiment adopts the touch sensing part, the second converter, the second controller and the power control device, the sensed touch sensing electric signal is converted into the power indication signal or the rotating speed indication signal through the change of the state of the touch control, the power given signal or the rotating speed given signal is generated through the second controller, the power control device controls the conduction of the dust collection motor, the technical effect of carrying out stepless speed regulation on the dust collector is obtained, and the user experience is improved.

As shown in fig. 14, which is a schematic structural diagram of the touch sensing element 410 provided in this embodiment, the touch sensing element 410 provided in this embodiment includes: a sensing button 411, an independent button 412, and an input/output terminal 413.

The induction keys 411 are formed by arranging more than 3 keys according to a certain rule, the induction keys 411 are sequentially and continuously arranged along a specified direction, and each induction key 411 is connected with a signal line to an input/output terminal 413 of the touch induction piece 410; the input/output terminal 413 also includes a ground line common to the sensor buttons 411. The sensing button 411 may implement touch detection by using a capacitive sensing principle.

The input/output terminal 413 provides signal connection to output the detection results of the sensing button 411 and the independent button 412 to a related circuit or a controller 610, so that the detection result formed by the capacitance change formed by the movement of the user on the sensing button 411 is converted into a speed regulation instruction for manually regulating the speed of the dust collector. The independent key 412 is a key which can be set selectively and is arranged at an interval with the induction key 411; by touching the independent button 412, the cleaner can be automatically adjusted in speed.

Through response button 411 carries out manual speed governing to the dust catcher, and independent button 412 can control the dust catcher and get into automatic speed governing, has obtained the technological effect to the combination of dust catcher automatic speed governing and manual speed governing, has effectively promoted user's operation experience.

Referring to fig. 14, the sensing button 411 of the present embodiment includes: the head button 411-1, the middle buttons 411-2 and the tail button 411-3, adjacent edges of the induction buttons 411 are mutually jogged and jointed, and concretely, the adjacent edges adopt zigzag or wave type mutual jogged and jointed.

For example, in the example of fig. 14, adjacent sides of the sensor button 411 are connected in a zigzag manner, and four adjacent sides of the zigzag are shown, and the middle button 411-2 is located between the four adjacent sides of the zigzag. Specifically, the middle button 411-2 includes: a first middle button 411-21, a second middle button 411-22, and a third middle button 411-23; each of the sensing buttons 411 is arranged in a rectangular shape after being overlapped, and there is a cross-sectional change between adjacent buttons in the touch moving direction instead of gradual handover. When a user touches the head button 411-1 and moves horizontally to the tail button 411-3, the capacitance detection result obtained by each button gradually changes along with the gradual change of the contact area and is transferred among the buttons, so that the instruction input can be smoothly realized, a smoothly-changing speed regulation instruction is sent out, and the smooth speed regulation of the dust collection motor of the dust collector can be realized according to the speed regulation instruction. For convenience of describing the change of the key state of the sensor key 411, the moving direction of the head key 411-1 to the tail key 411-3 is taken as an example for description, in actual operation, a user can move from the middle key 411-2 to the head key 411-1 or the tail key 411-3, and the moving direction is not limited.

When a finger touches the top button 411-1, the top button 411-1 has a first touch area to be contacted by the finger (if the ratio of the top button 411-1 is proper to the ratio of the finger, the top button 411-1 is sensed by 100% touch), when the finger moves from the top button 411-1 to the first middle button 411-21, the finger touches on the adjacent side of the sawtooth shape, and the first touch area of the top button 411-1 decreases and the touch area of the first middle button 411-21 increases.

By means of the mutual engagement and connection between the head button 411-1 and the first middle button 411-21, at the connection between the two adjacent sides, the ratio of the first touch area of the head button 411-1 to be touched changes in the moving direction of the user, that is, the first touch area of the head button 411-1 decreases, and at the same time, the touch area of the first middle button 411-21 increases, so that the ratio of the sensing touch sensing electric signal sensed by the sensing circuit (not shown) connected to the input/output terminal 413 changes; correspondingly, when moving from the first middle key 411-21 to the tail key 411-3, the touch area of the two adjacent keys is changed proportionally, and the sliding direction of the user and which sensing keys 411 are touched can be known through the touch sensing signal sensed by the touch circuit (not shown) connected with the input/output terminal 413, so that the user feels that the speed regulation of the dust collector is consistent, and the technical effect of smoothly and steplessly regulating the speed of the dust collector is further achieved.

In an alternative embodiment, the end button 411-3 and the head button 411-1 are electrically connected to each other, such as by a silver wire, to form the same button unit, and when the user slides from the head button 411-1 to the end button 411-3, the head button 411-1 and the end button 411-3 sequentially generate the same touch-sensitive electrical signal, indicating that a sliding process is finished. The scheme can increase the accuracy and the sensitivity of touch and improve the user experience.

In an alternative implementation, the power may be adjusted as long as it slides in a predetermined direction between any two points between the head button 411-1 and the tail button 411-3. When it is set that the power is increased by sliding from the head button 411-1 to the tail button 411-3, a first point and a second point are arbitrarily selected in order in a direction in which the head button 411-1 points to the tail button 411-3, a sliding adjustment for increasing the power is made when the user slides from the first point to the second point, and a sliding adjustment for decreasing the power is made when the user slides from the second point to the first point. Since the power value of the first point is not equal to the power value of the second point, when any two points between the areas of the head button 411-1 and the tail button 411-3 slide, the power change is generated, and the change is the power adjustment. Similarly, if the sliding movement from the head button 411-1 to the tail button 411-3 is set to reduce the power, the sliding movement between any two points between the two buttons can change the power value, which is also the adjustment power value. The power is adjusted by sliding between the two points, so that the user can use the power more conveniently, and the user experience is improved.

As shown in fig. 15 and 16, fig. 15 is a schematic structural diagram of the touch panel provided in the present embodiment, and fig. 16 is a schematic structural diagram of a position relationship between the touch sensing member and the touch panel;

the dust collector speed regulation control system also comprises: a touch panel 430; the upper part of the touch pad 430 is a touch surface for receiving touch control, and the touch sensing member 410 is attached to the lower part of the touch pad 430; the touch pad 430 can be indifferent to or can assist the touch sensitive element 410 in receiving touch controls that are directly loaded on the touch surface;

optionally, a touch direction icon 430-1 is disposed on the touch pad 430, and the user slides on the touch pad 430 along the prompting direction of the touch direction icon 430-1.

Optionally, the touch direction icon 430-1 includes a start icon 430-11 and a stop icon 430-12, and when the touch sensing member 410 is attached to the lower portion of the touch pad 430, the touch sensing member 410 is correspondingly attached between the start icon 430-11 and the stop icon 430-12, and the head button 411-1 corresponds to the start icon 430-11 and the tail button 411-3 corresponds to the stop icon 430-12. When a user adjusts the speed, the fingers slide between the start icon 430-11 and the end icon 430-12, or move between the start icon 430-11 and the end icon 430-12 in a proximity sensing mode, so that the speed of the dust collector is adjusted.

Optionally, the touch panel 430 may be made of plastic, glass, or metal plating.

As shown in fig. 17, the present application further provides a vacuum cleaner, which adopts the vacuum cleaner speed regulation control system as described above; and the dust collector speed regulating control system is arranged at the position of the outer surface of the dust collector.

The method for adjusting the power or the rotating speed of the dust collection motor of the present application is described below.

The embodiment of the application solves the technical problem that the adjustment of the motor power by a single index in the prior art is not accurate enough by providing a method for adjusting the power or the rotating speed of the dust collection motor, obtains the given value of the motor power by combining at least two indexes, and realizes the accurate adjustment of the motor power.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

the dust detection unit detects at least two dust indexes which are input into a dust collector control system, the dust collector control system is configured with a control scheme combining motor power and the dust indexes in advance, whether the detected dust indexes reach a corresponding range in the dust collector control system is judged, and the dust collection motor is controlled to execute corresponding operation according to an expected value of the motor power or the rotating speed in the range, for example, the existing power is increased or the existing power is reduced, and the expected value of the motor power is reached. It should be noted that, there are some differences in the specific control relationship between controlling the power of the dust collection motor and controlling the rotation speed of the dust collection motor, but the control relationship is completely consistent in nature, the directions of the power and the rotation speed are consistent, and the increase of the power and the rotation speed means the increase of the suction force to the dust collection motor. In order to adjust the suction force of the dust collection motor, power regulation or rotating speed regulation is feasible, and the control scheme is basically consistent.

For better understanding of the above technical solutions, the following technical solutions will be described with reference to the drawings and specific embodiments of the specification.

Please refer to fig. 18, which is a flowchart illustrating a method for adjusting power of a vacuum motor of a vacuum cleaner according to an embodiment of the present disclosure.

The method for adjusting the power or the rotating speed of the dust collection motor of the dust collector comprises the following steps:

s210: receiving dust indexes provided by a dust detection unit, wherein the dust indexes comprise at least two specific indexes reflecting dust conditions;

the dust detection unit is a dust sensor, which may be an infrared sensor, a photoelectric sensor or other type of sensor, and is used for detecting dust indexes in the dust passage.

The dust index specifically refers to a dust concentration index and a dust particle size index; the environmental pressure index, the environmental humidity index, the environmental temperature index, or the like may be included. The dust index is used for evaluating the dust condition in the working environment of the dust collector and other environmental conditions related to the dust, and is not limited to the specific indexes listed above.

S220: and substituting the dust index into a predetermined dust collection motor power or rotating speed control scheme to obtain an expected value of the dust collection motor power or rotating speed.

The dust index in this step is described by taking a dust concentration index and a dust particle index as examples.

The predetermined dust collection motor power or rotation speed control scheme can adopt various forms, wherein one form is a predetermined multidimensional table; the multi-dimensional table corresponds to a numerical range of specific indexes reflecting dust conditions, and sets a corresponding numerical value or numerical range of dust collection motor power or dust collection motor rotating speed for each group of dust index values.

The following is an example of a multi-dimensional table of the corresponding relationship between dust concentration, particle size and motor power:

from the contents of the above table, when the detected data of the dust amount (representing the dust concentration) and the dust particle size are obtained, the expected value of the motor power can be obtained.

Instead of tabular, functional; a method for implementing a predetermined control scheme for the power or speed of the suction motor in a functional manner is described in detail below.

The power or rotating speed control scheme of the dust collection motor is a preset power or rotating speed calculation function; including but not limited to the following functional relationships:

P＝a*T*D³，P＝a(T+D³)，P＝aT+bD，P＝a(T*D)，P＝a(T²+D²)；

wherein a and b are constants, T is a dust concentration value, and D is a dust particle size value; p is power, the power P in the formula can be changed into the rotating speed V, and in the process, the values of a and b constants are changed according to conditions.

The use of the above calculation function is not limited to any one, that is, in the process of adjusting the motor power, various schemes can be flexibly combined according to the situation; the following are specific ways that may be employed:

the calculation function adopts any one of the power calculation functions, or adopts two or more of the power calculation functions in a segmented manner, or simultaneously adopts two or more of the power calculation functions and weights the calculation value of each power calculation function.

For the relevant parameters used in the above functions, the values of the specific parameters can be determined according to methods such as experiments or empirical formulas or theoretical formulas of the dust collection motor.

S230: and providing a corresponding set value for a dust collection motor control unit according to the expected value of the power or the rotating speed of the dust collection motor.

The given value is a command value which is required to be provided by the controller to the dust collection motor control unit in order to obtain the expected value, and according to the command value, the dust collection motor control unit can appropriately control the dust collection motor to enable the power or the rotating speed of the dust collection motor to be on the expected value. The required set value can be calculated according to the expected value of the required motor power or the required rotating speed and the control relation of the control system, which is not described herein.

As a preferred embodiment, an upper limit value P may be set for the motor power_maxAnd a lower limit value P_minAfter the power of the dust collection motor is calculated by using a preset power or rotating speed calculation function, the power required to be output by the dust collection motor is calculated by adopting the following segmentation mode:

wherein, P_{Transfusion system}The expected value of the motor power output in the actual work of the dust collection motor of the dust collector is obtained; p is a calculated value of the power or the rotating speed of the dust collection motor calculated according to the calculation function; p in the formula_{Transfusion system}、P、P_min、P_maxCan be changed into corresponding dust collection motor rotating speed related value V_{Transfusion system}、V、V_min、V_max。

As a preferred embodiment, after the step of using the dust index to substitute a predetermined dust suction motor power or rotation speed control scheme, the following steps may be further performed:

s240: and correcting the obtained numerical value by combining the environmental air pressure index, the environmental humidity index or the environmental temperature index, and taking the corrected numerical value as an expected value of the power or the rotating speed of the dust collection motor.

This step means that in addition to the dust concentration and dust particle size indicators, other dust-related environmental indicators may be taken into account, for example, the suction force required by the cleaner may be very different for the same dust conditions at different humidities, a greater suction force may be required at higher humidities, and a lesser suction force at lower humidities. Therefore, the expected value of the power or the rotational speed of the dust collection motor obtained by the function or the table can be corrected based on the correlation indexes.

Optionally, when the dust collection motor is just started, the dust collection motor is operated by using a set starting power or a set starting rotating speed.

Alternatively, the dust concentration index is expressed by the number of particles at the detection position using a unit time.

Alternatively, the dust particle size indicator is expressed using a mean value of particle diameters passing through the detection positions.

Optionally, the dust detection unit is implemented by using a dust detection sensor including an emitter 211-1 and a receiver 211-2 and a matching circuit, which are disposed between the dust barrel of the dust collector and the air duct pipe.

The method of improving the accuracy of the dust detection sensor of the present application is described below.

The embodiment of the application provides a method for improving the precision of a dust detection sensor, solves the problem that the sensitivity of the dust detection sensor cannot be automatically calibrated when the dust detection sensor detects the dust concentration in the prior art, and realizes the calibration of the sensitivity of the dust detection sensor by using the emission intensity of an automatic dust detector.

In order to solve the problem of the sensitivity of the automatic calibration sensor, the technical scheme in the embodiment of the application has the following general idea:

a reference signal VS for evaluating the sensitivity of the dust sensor is arranged in the main control board, and the reference signal VS is a predetermined numerical value and is a fixed numerical value in the process that the dust sensor executes the current dust detection work; the value may also be provided with a suitable value interval error, specifically, determined according to the error range of the sensitivity of the dust detector in the current detection operation.

The detection electrical signal VR of the dust detection sensor is input into the main control board, and the main control board compares the detection electrical signal VR output by the sensor receiver 211-2 with the reference signal VS to judge the relation between the two signals; when the difference between the two values does not satisfy the preset threshold interval, the electric driving value (generally adopting the power supply voltage) provided to the transmitter 211-1 of the sensor can be adjusted to reduce the difference between the two values until the difference between the two values is within the preset error range, and then the calibration operation is completed. Thus, when the dust sensor detects dust, if the detection electrical signal VT and the reference signal VS are not within the preset error range, the dust sensor automatically controls the light-emitting intensity of the emitter 211-1 by adjusting the electrical drive of the emitter 211-1 of the dust sensor, so as to change the magnitude of the detection electrical signal VR of the dust sensor until the detection electrical signal VR meets the preset requirement; by the adjusting mode, the problem of automatic calibration of the sensitivity of the sensor is effectively solved.

It should be noted that the detection electrical signal VR is not directly used to obtain an output signal of dust concentration or dust particle size, but is directly output from the receiver 211-2 or simply amplified, and the signal generally tends to a stable value in a calibration environment. For example, if the detecting electrical signal is a voltage signal, the detecting electrical signal VR output by the receiver 211-2 will be stabilized soon after the light intensity of the transmitter 211-1 is adjusted; and the detection electric signal VR is the stabilized value. Calibration conditions are conditions in which the cleaner is not operating and the dust conditions of the environment are normal, in which case the sensor can be calibrated.

The detection electrical signal VR and the reference signal VS are generally voltage signals, but other forms of electrical signals, such as current signals, pulse signals, square wave signals, etc., are not excluded.

The dust state detection signal is a digital square wave signal obtained by amplifying and shaping the detection electrical signal VR, and is opposite to the detection electrical signal VR and used as a basis for detecting dust concentration or dust particle size.

In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and specific embodiments of the specification.

Please refer to fig. 19, which is a flowchart illustrating a method for improving accuracy of a dust detection sensor according to an embodiment of the present application.

The method for improving the accuracy of the dust detection sensor comprises the following steps:

s310: in a calibration operating environment, the emitter 211-1 of the dust detection sensor is supplied with an electrical drive VT of a determined value.

Calibration conditions are conditions in which the cleaner is not operating and the dust conditions of the environment are normal, in which case the sensor can be calibrated. The electric drive VT provides a driving power to the emitter 211-1 of the dust sensor, and the emitter 211-1 is typically a light emitting diode, emitting light within a certain driving voltage range. The electrically driven VT may be characterized by a voltage value, a current value, or other electrical signal value; in more cases, the electrically driven VT takes on voltage values.

In this step, the electrically-driven VT is a determined value means any voltage value within a driving voltage range of the dust sensor, the corresponding electrically-driven VT is a voltage value provided in a calibration environment, the electrically-driven VT is provided irrespective of the sensitivity of the dust detection sensor, and is provided as an initial voltage value to be calibrated, and thus is not a voltage value in actual operation, and thus can be arbitrarily determined within an operation characteristic range of the sensor. In a specific embodiment, the electrically driven VT is provided by a voltage output port provided on the controller.

S320: receives a detection electric signal VR output from the receiver 211-2 of the dust detection sensor;

the detection electrical signal VR is a signal obtained after the optical signal of the transmitter 211-1 of the dust sensor is received by the receiver 211-2. As mentioned above, the signal may be a signal simply amplified by an amplifier; the signal is accessed to the main control board through an input port of the main control board in the controller and is read by the main control board.

S330: and comparing the value of the detection electric signal VR with the value of a preset reference signal VS, and judging whether the difference value of the two is in a preset range.

The reference signal VS is a signal value which can be known in advance, and if the detection electric signal VR works on the reference signal VS, the accuracy, stability and linearity are the best, so that the best measurement effect can be obtained; the specific value of the reference signal VS is determined according to factory parameters of the sensor or obtained through experimental measurement, and the value is recorded in a memory of the controller for reading.

Since it is practically difficult to make the detection electrical signal VR equal to the reference signal VS, a range of values around the reference signal VS can be set as a reasonable working area for the detection electrical signal VR. In order to determine whether the detection electrical signal VR is within a predetermined range, it may be determined whether an absolute value of a difference between a value of the detection electrical signal VR and a value of the reference signal VS obtained is equal to or less than a value corresponding to the predetermined range, for example, the reference signal VS is 2.4(v), and the predetermined range is 2.4v ± 0.1 v; then | VR-2.4| ≦ 0.1 may be used to determine whether the detected electrical signal is satisfactory.

S340: if so, the value of the currently provided electric drive VT is satisfactory as the electric drive to be provided to the emitter 211-1 of the dust detection sensor for operation.

This step is performed when the determination result of step S330 is yes, and at this time, according to the determination result of step S330, the value of the electrical drive VT currently provided for the transmitter 211-1 may be considered to be satisfactory and may be used. The step determines that the adopted electric drive VT is a numerical value after being debugged for a plurality of rounds; after the step is entered, the calibration process can be finished.

S350: if not, adjusting the value of the electric drive VT in the opposite direction according to the comparison result of the value of the detection electric signal VR and the value of the reference signal VS, and returning to the step of receiving the detection electric signal VR output by the receiver 211-2 of the dust detection sensor.

This step is executed when the determination result of step S330 is negative, and at this time, according to the determination result of step S330, the value of the electrical drive VT currently provided for the transmitter 211-1 may be considered to be not satisfactory and cannot be directly used. For this reason, if it is necessary to re-provide the value of the electrically-driven VT, and a new value of the electrically-driven VT is adopted, the process returns to step S320 to perform a new round of test.

The re-providing of the value of the electrically driven VT requires adjusting the value of the electrically driven VT in the opposite direction according to the comparison result of the previous step S330; the adjustment in the opposite direction means:

if the detection electrical signal VR is greater than the reference signal VS, it indicates that the brightness of the emitter 211-1 needs to be decreased, and correspondingly, the value of the electrically-driven VT needs to be decreased;

if the detection electrical signal VR is smaller than the reference signal VS, it indicates that the brightness of the emitter 211-1 needs to be increased, and accordingly, the value of the electrical drive VT needs to be increased.

The above-mentioned adjusting the value of the electric drive VT in the opposite direction actually only describes the direction of adjustment, and for the actual adjustment, it is desirable to be able to directly obtain a specific possible value as much as possible so as to determine a reasonable value of the electric drive VT more quickly; for this purpose, calculation methods may be used, which may be preset in the control system 600, determined by calculation from the calculation resources provided by the control system 600, and provided to the transmitter 211-1 via the output port of the controller with the determined electric drive VT.

The specific calculation method includes, in general, taking the already known value set of the electric drive VT and the corresponding detection electrical signal VR in the aforementioned debugging step as a known value, obtaining a fitting function passing through the value set, and then determining the value of the electric drive VT corresponding to the ideal value of the detection electrical signal VR according to the fitting function. By using the function fitting method, the required electric driving VT value can be obtained quickly. In the specific process of function fitting, linear function fitting is generally adopted, and under special conditions, other function fitting can be considered; for example, if the sensor operating characteristic is a quadratic function, fitting a quadratic function may be considered. The following describes a specific process by taking a linear function fitting manner as an example.

Referring to fig. 20, a flow chart of the above-mentioned specific way of adjusting the electric drive VT in a function-fitting manner is shown. In step S350, the step of adjusting the value of the electric drive VT in the opposite direction according to the comparison result between the value of the detection electric signal VR and the value of the reference signal VS, and returning to receive the detection electric signal VR output from the receiver 211-2 of the dust detection sensor specifically includes the following steps:

s351: the value of the electrical drive VT used in the last debugging round, and the obtained value of the detected electrical signal VR output by the receiver 211-2 corresponding thereto, form a set of data as current data;

s352: if the value of the detection electrical signal VR is lower than the value of a preset reference signal VS, reestablishing the linear relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is higher than the preset reference signal VS and is closest to the reference signal VS and is obtained in the previous adjusting step; if the value of the detection electrical signal VR is higher than the value of a preset reference signal VS, reestablishing the linear relation between the driving voltage and the detection electrical signal VR according to the current data and a group of data which is obtained in the previous adjusting step, is lower than the preset reference signal VS and is closest to the reference signal VS;

s353: according to the linear relation between the re-established driving voltage and the detection signal VR, the value of the driving voltage VT corresponding to the reference signal VS is obtained again;

s354: taking the retrieved value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of supplying the emitter 211-1 of the dust detection sensor with the determined value of the electric driving VT, and performing the subsequent steps;

s355: repeating the steps until the driving voltage VT meeting the requirement is obtained; that is, the determination result in step S330 is yes, and the process proceeds to step S340.

Please refer to fig. 21, which is a flowchart illustrating a method for determining an electrically driven VT according to the present application; the method for determining the electrically driven VT is characterized in that an upper limit value and a lower limit value of the electrically driven VT of a sensor are utilized; the upper limit value and the lower limit value can be obtained according to factory parameters of the sensor.

Specifically, before step S310, i.e. before providing the electric drive VT of a determined value to the emitter 211-1 of the dust detection sensor in the calibration operating environment, the method includes the following steps:

s0-301, obtaining voltage values of the detection electric signals VR output by the receiver 211-2 corresponding to the upper limit voltage value and the lower limit voltage value of the driving voltage in the driving voltage range; the voltage value of the electrical detection signal VR corresponding to the upper limit voltage value and the voltage value of the electrical detection signal VR output by the receiver 211-2 corresponding to the lower limit voltage value can be obtained through experimental measurement.

S0-302, establishing a functional relation between the driving voltage and the detection electric signal VR according to two groups of data (the upper limit voltage value, the voltage value of the detection electric signal VR output by the receiver 211-2 corresponding to the upper limit voltage value) and (the lower limit voltage value, the voltage value of the detection electric signal VR output by the receiver 211-2 corresponding to the lower limit voltage value); when a linear function is adopted, the functional relationship is a linear relationship.

And S0-303, obtaining the value of the driving voltage VT corresponding to the reference signal VS according to the functional relation between the driving voltage and the detection electric signal VR.

S0-304, the value of the driving voltage VT corresponding to the reference signal VS is used as the value of the electric driving VT in the step of supplying the emitter 211-1 of the dust detection sensor with the determined value of the electric driving VT, and the subsequent steps are performed.

The data are now illustrated by the following table listing:

the voltage value of the reference signal VS is 1.4 v.

The drive voltage 1.2V is taken as the electric drive VT of the determined value.

When the detection electrical signal is obtained, the actually obtained signal is a signal including a variation process, and therefore, it is necessary to determine a suitable value timing for obtaining the detection electrical signal. Generally, two approaches can be used:

waiting for the value of the analog voltage signal obtained after the voltage signal output by the output end of the receiver 211-2 is stabilized to be used as the detection electrical signal output by the receiver 211-2;

alternatively, after the digital square wave signal to be used for representing the dust state is kept at 0 for a time interval of a prescribed length, the voltage value of the obtained detection electric signal VR is used as the detection electric signal output by the receiver 211-2; the essence of the method is that the situation of the dust state detection signal is used to indicate that the detection electric signal is already in a stable state.

Please refer to fig. 22, which is a flowchart illustrating another method for determining an electrically driven VT according to the present disclosure.

The step of providing the electric drive VT of a determined value to the emitter 211-1 of the dust detection sensor in the non-operating state comprises the following steps before:

s1-301: obtaining a voltage value of a first detection electrical signal VR output by the receiver 211-2 corresponding to a first driving voltage value, wherein the first driving voltage value is any estimated value in a driving voltage range;

s1-302: obtaining a voltage value of a second detection electrical signal VR output by the receiver 211-2 corresponding to a second driving voltage value, wherein the second driving voltage value is a value different from the first driving voltage value within a driving voltage range;

s1-303: establishing a linear relation between the driving voltage and the detection electric signal VR according to the two groups of data (the first driving voltage value, the voltage value of the first detection electric signal VR), and the second driving voltage value, the voltage value of the second detection electric signal VR);

s1-304: obtaining a value of the driving voltage VT corresponding to the reference signal VS according to the linear relation between the driving voltage and the detection electrical signal VR;

s1-305: the value of the driving voltage VT corresponding to the reference signal VS is used as the value of the electric drive VT in the step of supplying the emitter 211-1 of the dust detection sensor with the determined value of the electric drive VT, and the subsequent steps are performed.

In addition to the above-mentioned solutions, the data obtained from each debugging cycle can also be utilized to obtain a more accurate fitting function, in which case the fitting function may not be linear or only approximately linear, and the specific processing method provides many possible processing procedures in the prior art, which are not described in detail herein; roughly, the process is as follows:

forming a group of data by using the value of the electric drive VT used in the current debugging and the obtained value of the detection electric signal VR output by the receiver corresponding to the value of the electric drive VT, and adding the group of data into the data obtained in the previous debugging and the initial data to form current sample data;

according to the current sample data, reestablishing the functional relation between the driving voltage VT and the detection electric signal VR;

according to the linear function relation between the re-established driving voltage and the detection signal VR, re-obtaining the calculated value of the driving voltage VT corresponding to the reference signal VS;

taking the retrieved derived value of the driving voltage VT corresponding to the reference signal VS as the value of the electric driving VT in the step of supplying the emitter of the dust detection sensor with the determined value, and performing the subsequent steps;

the above steps are repeated until the driving voltage VT meeting the requirements is obtained.

By using the method for improving the precision of the dust detection sensor, the dust detection sensor can be effectively ensured to work at a proper position of a working curve of the dust detection sensor, so that the working precision of the dust detection sensor is effectively improved.

The various improvement measures around the dust collector provided by the embodiment of the application can effectively improve the working condition of the dust collector and improve the use experience.

Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application, and those skilled in the art can make variations and modifications without departing from the spirit and scope of the present application, therefore, the scope of the present application should be determined by the claims that follow.

Claims (11)

1. A method of improving accuracy of a dust detection sensor, comprising:

providing a determined value of the electrically driven VT to the emitter of the dust detection sensor in a calibration operating environment, wherein the providing of the determined value of the electrically driven VT to the emitter of the dust detection sensor in the calibration operating environment comprises the following steps:

obtaining a value of a detection electric signal VR output by a receiver and respectively corresponding to an electric drive upper limit value and a lower limit value in an electric drive range; establishing a functional relation between the electric drive and the detection electric signal VR according to two groups of data, namely the value of the detection electric signal VR output by the receiver corresponding to the electric drive upper limit value and the electric drive lower limit value, and the value of the detection electric signal VR output by the receiver corresponding to the electric drive lower limit value and the electric drive lower limit value;

or obtaining the value of the first detection electric signal VR output by the receiver corresponding to a first electric drive value, wherein the first electric drive value is any estimated value in the electric drive range; obtaining a value of a second detected electrical signal VR output by the receiver corresponding to a second electrical drive value, wherein the second electrical drive value is a different value in an electrical drive range than the first electrical drive value; establishing a functional relation between the electric drive and the detection electric signal VR according to two groups of data of the first electric drive value and the value of the first detection electric signal VR and the second electric drive value and the value of the second detection electric signal VR as initial data;

obtaining an estimated value of the electric drive corresponding to the reference signal VS according to the functional relation between the electric drive and the detection electric signal VR; taking the estimated value of the electric drive corresponding to the reference signal VS as the value of the electric drive VT in the step of the electric drive VT providing the determined value to the transmitter of the dust detection sensor, and performing the subsequent steps;

receiving a detection electrical signal VR output from the receiver of the dust detection sensor;

comparing the value of the detection electric signal VR with the value of a preset reference signal VS, and judging whether the difference value of the two is within a preset range;

if yes, the value of the electric drive VT provided currently meets the requirement, and the value is used as the electric drive for the emitter of the dust detection sensor to work;

if not, adjusting the value of the electric drive VT in the opposite direction according to the comparison result of the value of the detection electric signal VR and the value of the reference signal VS, and returning to the step of receiving the detection electric signal VR output by the receiver of the dust detection sensor;

wherein the electrically driven VT comprises a voltage and a current, and the functional relationship is a linear functional relationship.

2. The method of claim 1, wherein the detection electrical signal VR and the reference signal VS are characterized by one of a voltage signal, a current signal, a pulse signal, and a square wave signal.

3. The method of claim 2, wherein the electrical drive uses a drive voltage, and the detection electrical signal VR and the reference signal VS are characterized by voltage values.

4. The method for improving the accuracy of a dust detection sensor according to claim 2, wherein the value of the analog voltage signal obtained after the voltage signal is stabilized is used as the detection electrical signal output by the receiver.

5. The method for improving the accuracy of a dust detection sensor according to claim 2, wherein the voltage value of the detection electrical signal VR is obtained as the detection electrical signal outputted from the receiver after the digital square wave signal to be used for representing the dust state is maintained at 0 for a time interval of a predetermined length.

6. The method of claim 3, wherein "if not, adjusting the value of the electrical drive VT in an opposite direction according to the comparison result of the value of the detection electrical signal VR and the value of the reference signal VS", specifically:

forming a set of data of the value of the electrical drive VT used in the last one of the series of trials and the value of the detected electrical signal VR obtained at the output of the receiver corresponding thereto as current data;

if the value of the detection electric signal VR is lower than the value of a preset reference signal VS, reestablishing the functional relationship between the electric drive and the detection electric signal VR according to the current data and a group of data which is higher than the preset reference signal VS and is closest to the reference signal VS and is obtained in the previous adjusting step; if the value of the detection electrical signal VR is higher than the value of the preset reference signal VS, reestablishing the functional relationship between the electric drive and the detection electrical signal VR according to the current data and a group of data which is obtained in the previous adjusting step, is lower than the preset reference signal VS and is closest to the reference signal VS;

according to the re-established functional relation between the electric drive and the detection signal VR, re-obtaining the calculated value of the electric drive VT corresponding to the reference signal VS;

taking the retrieved derived value of the electrically driven VT corresponding to the reference signal VS as the value of the electrically driven VT in the step of electrically driving the VT to provide a determined value for the emitter of the dust detection sensor, and performing the subsequent steps;

repeating the steps until an electric drive VT meeting the requirement is obtained;

wherein the functional relationship is a linear functional relationship.

7. The method of claim 1, wherein when the first detection signal VR and the second detection signal VR are both analog voltage signals, the value of the analog voltage signal obtained after the voltage signals are stabilized is used as the detection electrical signal output by the receiver.

8. The method of claim 1, wherein the first detecting electrical signal VR and the second detecting electrical signal VR are both digital pulse signals, and the voltage value of the detecting electrical signal VR is obtained as the detecting electrical signal outputted by the receiver after the digital pulse signals are maintained at 0 for a predetermined time interval.

9. The method of claim 1, wherein "if not, adjusting the value of the electrical drive VT in an opposite direction according to the comparison of the value of the detection electrical signal VR and the value of the reference signal VS" specifically:

forming a group of data by using the value of the electric drive VT used in the debugging of the round and the obtained value of the detection electric signal VR output by the receiver corresponding to the value of the electric drive VT as current data;

if the value of the detection electric signal VR is lower than the value of a preset reference signal VS, reestablishing the functional relationship between the electric drive and the detection electric signal VR according to the current data and a group of data which is higher than the preset reference signal VS and is closest to the reference signal VS and is obtained in the previous adjusting step; if the value of the detection electrical signal VR is higher than the value of the preset reference signal VS, reestablishing the functional relationship between the electric drive and the detection electrical signal VR according to the current data and a group of data which is obtained in the previous adjusting step, is lower than the preset reference signal VS and is closest to the reference signal VS;

according to the function relation between the re-established driving voltage and the detection signal VR, re-obtaining the calculated value of the electric drive VT corresponding to the reference signal VS;

taking the retrieved derived value of the electrically driven VT corresponding to the reference signal VS as the value of the electrically driven VT in the step of electrically driving the VT to provide a determined value for the emitter of the dust detection sensor, and performing the subsequent steps;

repeating the steps until an electric drive VT meeting the requirement is obtained;

wherein the functional relationship is a linear functional relationship.

10. The method of claim 1, wherein "if not, adjusting the value of the electrical drive VT in an opposite direction according to the comparison of the value of the detection electrical signal VR and the value of the reference signal VS" specifically:

forming a group of data by using the value of the electric drive VT used in the current debugging and the obtained value of the detection electric signal VR output by the receiver corresponding to the value of the electric drive VT, and adding the group of data into the data obtained in the previous debugging and the initial data to form current sample data;

according to the current sample data, reestablishing a functional relation between the electric drive and the detection electric signal VR;

according to the linear function relation between the reestablished electric drive and the detection signal VR, the calculation value of the electric drive VT corresponding to the reference signal VS is obtained again;

taking the retrieved derived value of the electrically driven VT corresponding to the reference signal VS as the value of the electrically driven VT in the step of electrically driving the VT to provide a determined value for the emitter of the dust detection sensor, and performing the subsequent steps;

repeating the steps until an electric drive VT meeting the requirement is obtained;

wherein the functional relationship is a linear functional relationship.

11. A vacuum cleaner, characterized in that a method for improving the accuracy of a dust detection sensor as claimed in any one of the preceding claims 1-10 is used.

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