CN111813276A - Sitting detection device - Google Patents
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- CN111813276A CN111813276A CN201910355528.3A CN201910355528A CN111813276A CN 111813276 A CN111813276 A CN 111813276A CN 201910355528 A CN201910355528 A CN 201910355528A CN 111813276 A CN111813276 A CN 111813276A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
A sitting detection device of an embodiment of the present invention includes: a reference sensor; a seating sensor connected to the reference sensor and varying a capacitance according to seating; a frequency generating unit connected to the seating sensor and the reference sensor, and sequentially generating a plurality of frequency bands; a plurality of calculation units for detecting changes in capacitance of the seat sensor and the reference sensor in a plurality of frequency bands generated by the frequency generation unit and calculating frequencies corresponding to the detected changes in capacitance; and a seating determination unit that individually determines seating in the plurality of frequency bands based on the calculated values calculated by the multiple calculation unit.
Description
Technical Field
The present invention relates to a sitting detection device. More particularly, the present invention relates to a sitting detection method and a sitting detection device for accurately detecting sitting in an environment where noise occurs frequently by using a capacitive sensor in a plurality of frequency bands, thereby improving the reliability of the device.
Background
Recently, in many digital devices such as smartphones, refrigerators, and notebook computers, an input means for controlling an operation has been changed from a button switch to a touch detection device such as a touch pad, a touch sensor, and a touch screen.
As a representative example, the touch detection device uses a capacitive type, a resistive type, a pressure type, an optical type, an ultrasonic type, or the like, and in the case of the capacitive type, there is a detection method of detecting (Sensing) a change amount of a voltage accumulated according to a change in Capacitance (Capacitance), generating a clock signal (clock signal) according to a change in oscillation frequency of an internal oscillator, calculating a value counted by a calculator (Counter), and comparing the calculated value, thereby detecting a touch of a user as a comparison result.
In other words, when an object or a user approaches or touches a detection electrode of a capacitive touch sensor (hereinafter, referred to as a touch sensor), a capacitance change occurs between the object or the user and the detection electrode, and an oscillation frequency is generated according to the capacitance change, so that the touch detection device can detect whether the object or the user touches or approaches.
That is, the above method is affected not only by a change in capacitance maintained by an object approaching or contacting the touch sensor but also by external Noise (Noise) which is applied in a protruding manner, and may be affected by power supply Noise, high-frequency in-phase and differential Noise which change with time.
As a result, the touch detection device recognizes that the capacitance increases or decreases in response to the ambient noise, and even if a touch is not made, a predetermined operation or touch occurs, and the sensitivity decreases, thereby causing a problem that the operation cannot be performed.
On the other hand, when the touch detection device is operated in an environment with high humidity, temperature, water vapor, and the like act as noise, and even if the touch detection device is subjected to waterproofing, there is a concern that the external environment may change, a predetermined gap may be formed in the device, and moisture may permeate due to aging of the device, and the device may malfunction due to noise.
Therefore, a new capacitive seating detection device is required that minimizes the influence of externally generated noise to improve the accuracy of touch sensitivity, and the present invention is related thereto.
Documents of the prior art
Patent document
Patent document 0001: korean granted patent publication No. 10-1135358 (04 month/04 days 2012)
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sitting detection method and a sitting detection device for performing the method, in which: the frequency is transferred to the reference sensor and the seating sensor at the same time, and seating of the user can be more accurately judged by observing noise or a change in capacitance based on seating.
Another object of the present invention is to provide a sitting detection method and a sitting detection apparatus for performing the same, the sitting detection method including: even if noise occurs according to the external temperature and humidity, the sitting of the user can be accurately judged.
Another object of the present invention is to provide a seating detection device including: the center frequency value in the frequency band generated for detecting sitting is constituted by a prime number (prime number), whereby the influence of the generated frequency band on external noise can be minimized.
Technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood from the following description by a person of ordinary skill in the art to which the present invention pertains.
A sitting detection device of an embodiment of the present invention includes: a reference sensor; a seating sensor connected to the reference sensor and varying a capacitance according to seating; a frequency generating unit connected to the seating sensor and the reference sensor, and sequentially generating a plurality of frequency bands; a plurality of calculation units that detect changes in capacitance of the seat sensor and the reference sensor in a plurality of frequency bands generated by the frequency generation unit, and calculate frequencies corresponding to the detected changes in capacitance; and a seating determination unit that individually determines seating in the plurality of frequency bands based on the calculated values calculated by the multiple calculation unit.
According to an embodiment, the frequency generating unit may transmit the plurality of frequency bands to the seating sensor and the reference sensor at the same time.
According to an embodiment, the plurality of frequency bands may be formed of first to nth frequency bands (N is a natural number of 2 or more), and the first to nth frequency bands may be formed of first to mth frequencies (M is a natural number of 2 or more) that vary within a predetermined range with respect to the respective center frequencies.
According to an embodiment, the center frequency value may have a prime value in the first to nth frequency bands.
According to an embodiment, the plurality of calculation units may collect a plurality of frequencies respectively corresponding to first to mth frequencies among the plurality of frequency bands, and may group the collected plurality of frequencies into first to mth synthesis frequency bands.
According to an embodiment, the multi-calculating part counts frequencies corresponding to changes in capacitance detected by the seat sensor and the reference sensor, and calculates the calculated capacitance value of the seat sensor in each of the plurality of frequency bands.
According to an embodiment, the seating determination part may determine that the seating detection in the corresponding frequency band is valid in a case where the capacitance calculation value of the seating sensor is greater than or equal to a preset sensitivity value, and determine that the seating of the seating detection device is valid in a case where the number of frequency bands determined to be valid is greater than or equal to a preset number.
According to an embodiment, when the seating detection device generates noise that changes with time, the seating sensor and the reference sensor may change the magnitude of capacitance in the same manner.
A sitting detection method of another embodiment of the present invention is a sitting detection method of a sitting detection device, the sitting detection device including: a reference sensor; a seating sensor connected to the reference sensor and varying a capacitance according to seating; a frequency generating unit connected to the seating sensor and the reference sensor, and sequentially generating a plurality of frequency bands; and a multi-calculation section connected to the frequency generation section for determining sitting, the sitting detection method including: detecting a change in capacitance of the seat sensor and the reference sensor in the plurality of frequency bands; calculating a frequency corresponding to each of the detected capacitance changes; and a step of individually determining the seating detection in each of the plurality of frequency bands based on the calculated frequency values.
According to an embodiment, the plurality of frequency bands may be formed of first to nth frequency bands (N is a natural number of 2 or more), the first to nth frequency bands being formed of first to mth frequencies (M is a natural number of 2 or more) that vary within a predetermined range with respect to respective center frequencies.
According to an embodiment, the center frequency value may have a prime number (prime number) value in the first to nth frequency bands.
According to an embodiment, before the step of detecting the capacitance change, a step of collecting a plurality of frequencies corresponding to first to nth frequencies in the plurality of frequency bands and grouping the collected frequencies into first to nth sub-bands may be further included, and the step of detecting the capacitance change may be a step of detecting capacitance changes of the seating sensor and the reference sensor in first to mth composite bands of the grouping.
According to an embodiment, the step of calculating the frequency may be a step of counting frequencies corresponding to changes in capacitance detected by the seat sensor and the reference sensor and calculating capacitance calculation values of the seat sensor in the plurality of frequency bands, respectively.
According to an embodiment, the step of individually determining the sitting detection may further include: comparing the calculated capacitance value of the seating sensor with a preset sensitivity value; and a step of judging that the seating detection in the corresponding frequency band is valid when the capacitance calculation value of the seating sensor is greater than or equal to a preset sensitivity value.
According to an embodiment, the determining step may be followed by a step of determining that the sitting of the sitting detecting device is valid when the number of the frequency bands for which the sitting detection is valid is determined to be equal to or greater than a preset number.
According to an embodiment, the seating sensor and the reference sensor may simultaneously receive the plurality of frequency bands, and the seating sensor and the reference sensor may change the same magnitude of capacitance when noise that changes with time occurs in the seating detection device.
According to the present invention, the same frequency band is transmitted to the reference sensor and the seating sensor, and the seating of the user is determined in a plurality of frequency bands in order to observe a change in capacitance due to noise or seating, thereby improving the accuracy of the seating determination.
Further, the present invention has an effect that even if noise occurs due to moisture permeating into the device, the change in capacitance can be observed in a plurality of frequency bands to accurately detect the sitting of the user.
Further, the present invention has an effect that the center frequency value of the frequency band transmitted by the frequency generation unit in the sitting detection device is constituted by a prime number, and the influence based on the frequency corresponding to the positive multiple (multiple frequency) is minimized, thereby calculating the accurate frequency for detecting sitting.
Further, the present invention has an effect that frequencies belonging to a plurality of frequency bands are clustered, and seating is detected for each clustered frequency, whereby it is possible to accurately determine whether seating detected by the seating detection device is effective seating.
Also, the present invention has an effect that a seating calculation value can be accurately detected even if noise whose magnitude changes from moment to moment occurs as the frequency change of the reference sensor and the seating sensor is detected at the same time period, thereby preventing malfunction of the seating detection device.
The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood from the following description by those skilled in the art to which the present invention pertains.
Drawings
Fig. 1 is a diagram showing a structure of a seating detection device according to an embodiment of the present invention.
Fig. 2 is a diagram showing the circuit configuration of the reference sensor and the seating sensor of an embodiment of the present invention.
Fig. 3 is a graph for explaining frequency changes of the reference sensor and the seating sensor according to an embodiment of the present invention.
Fig. 4 is a diagram for explaining a plurality of frequency bands generated by the frequency generating unit according to the embodiment of the present invention.
Fig. 5a and 5b are diagrams for explaining a manner in which a plurality of frequency bands change according to noise that changes with time in the conventional and the present invention.
Fig. 6a to 6f are diagrams for explaining a manner of determining seating of the seating determination section in a plurality of frequency bands according to various embodiments of the present invention.
Fig. 7 is a diagram for explaining a manner in which a plurality of computing units cluster frequencies according to an embodiment of the present invention.
Fig. 8 is a flowchart showing a flow of a sitting detection method using the sitting detection apparatus according to an embodiment of the present invention.
Fig. 9 is a flowchart embodying step S130 and step S140 shown in fig. 8.
Description of reference numerals
100: sitting detection device
110: reference sensor
120: sitting sensor
130: frequency generating part
140: multi-calculation part
150: sitting judgment part
160: control unit
170: power supply unit
180: output unit
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention and methods of accomplishing the same will become more apparent from the detailed description of the embodiments set forth below when taken in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various forms, and the embodiments are provided to enable those skilled in the art to fully understand the scope of the present invention, which is defined by the scope of the claims. Throughout the specification, like reference numerals denote like structural elements.
Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Also, unless explicitly defined otherwise, terms defined by commonly used dictionaries should not be interpreted in an ideal or exaggerated sense. The terminology used in the description is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In this specification, the singular forms also include the plural forms unless specifically mentioned in the context.
The use of "comprising" and/or "comprising" … … in this specification means that the stated structural elements, steps, acts and/or elements do not preclude the presence or addition of one or more other structural elements, steps, acts and/or elements.
Fig. 1 is a diagram showing the structure of a sitting detection device 100 according to an embodiment of the present invention. Fig. 2 is a diagram showing the circuit configuration of the reference sensor 110 and the seating sensor 120 according to an embodiment of the present invention.
However, this is only a preferred embodiment for achieving the object of the present invention, and a part of the structures may be added or deleted as necessary, and the functions performed by one structure may be performed by the other structures together.
Referring to fig. 1, the seating detection device 100 may include a reference sensor 110, a seating sensor 120, a frequency generation part 130, a multi-calculation part 140, a seating determination part 150, a control part 160, a power supply part 170, and an output part 180.
The reference sensor 110 and the seating sensor 120 are sensors that collect an index for determining whether the user is in contact with the seating detection device 100, and each sensor may include a capacitor to receive a change in capacitance (change in capacitance). To this end, the seating sensor 120 may be formed in a housing form including a seating plate exposed to a user.
More specifically, referring to fig. 2, as shown in (a), the reference sensor 110 may have a circuit structure in which a resistor (R) is connected in series with a capacitor C1, and as shown in (b), the seating sensor 120 may have a circuit structure in which two capacitors C2, C3 are connected in parallel. Here, one of the two capacitors C2 and C3 formed in the seating sensor 120 may have the same capacitance value as that generated in the seating plate, and the remaining one capacitor may be added to adjust the seating sensitivity. The resistance R and the capacitor C1 formed in the reference sensor 110 are also adjusted in resistance value and capacitance value for adjusting the sitting sensitivity, or may be added in number. On the other hand, the circuit configuration forming the reference sensor 110 and the seating sensor 120 is connected to the frequency generating unit 130 described later for receiving the frequency, and the sensors are connected to the different frequency generating units 130a and 130b, whereby seating of the seating detection device 100 and noise can be effectively detected.
On the other hand, the reference sensor 110 is a sensor for acquiring a reference value for determining whether the sitting of the user is effective, and may be provided in the same environment as the sitting sensor 120. That is, the reference sensor 110 has the same environment as the seat sensor 120 except for the connection of the seat plate, and thus the reference sensor 110 is affected only by the ambient temperature, humidity, and noise of the power supply.
Meanwhile, the seating sensor 120 is a sensor that receives a capacitance variation value of the seating plate, and the capacitance in the seating sensor 120 increases at the moment when the user sits on the seating plate, whereby a frequency value transmitted for detecting seating changes, on the basis of which it can be judged whether the user touches the seating plate.
On the other hand, the seating sensor 120 including the seating plate may include: a Printed Circuit Board (PCB) comprising a sensor circuit formed by two capacitors C1, C2; a housing forming an outline of the sensor; and a metal wire connected to the seating detection device 100, and in case of a printed circuit board, may be manufactured by an injection molding method or an epoxy molding method. Also, the sensor circuit may include metal lines connected to power (VDD), Ground (GND) and OUTPUT (OUTPUT) terminals and metal lines connected to a board detecting a user's contact. The configuration of the seating sensor 120 is merely an example for explaining the present invention, and any one of the components may be added or deleted.
The frequency generating part 130 may be connected to the reference sensor 110 and the seating sensor 120 to generate a frequency for detecting seating and transmit the frequency to the reference sensor 110 and the seating sensor 120 at the same time.
In connection with this, fig. 3 is a diagram for explaining frequency changes of the reference sensor 110 and the seating sensor 120 according to an embodiment of the present invention, and referring to fig. 3, it can be confirmed that the magnitude of capacitance changes is the same even if noise such as ambient temperature, humidity, and power supply occurs in the reference sensor 110 and the seating sensor 120 disposed in the same environment except for the seating plate, and as shown in (a), there is no difference in frequency value between the reference sensor 110 and the seating sensor 120. Where Fr is the frequency value of the reference sensor 110 and Fs is the frequency value of the seating sensor 120.
In contrast, in the case where the sitting of the user is detected in the sitting plate connected to the sitting sensor 120, only the capacitance of the sitting sensor 120 is increased, as shown in (b), it can be confirmed that only the frequency value (Fs) of the sitting sensor 120 is decreased, and thus, a difference in frequency value occurs between the reference sensor 110 and the sitting sensor 120, and the sitting of the user can be detected.
On the other hand, in the process of transmitting the frequency to the reference sensor 110 and the seating sensor 120 at the same time by the frequency generating unit 130, a plurality of frequency bands are sequentially generated and transmitted in order to improve discrimination of noise.
In connection with this, fig. 4 is a diagram for explaining a plurality of frequency bands generated by the frequency generation unit 130 according to an embodiment of the present invention, and referring to fig. 4, as shown in (a), it can be confirmed that the plurality of frequency bands (SBF1, SBF2, … SBFN) generated by the frequency generation unit 130 are simultaneously transmitted to the reference sensor 110 and the seating sensor 120.
Fig. 5a and 5b are diagrams for explaining a manner in which a plurality of frequency bands change according to noise that changes with time in the conventional and the present invention.
Referring to fig. 5a, in the conventional device in which the frequency generating unit 130 is connected in parallel to the reference sensor 110 and the seat sensor 120, when noise that changes with time is generated, changes in the frequency bands transmitted to the reference sensor 110 and the seat sensor 120 are sequentially checked. That is, the frequency value (Fr) of the reference sensor 110 and the frequency value (Fs) of the seating sensor 120 become a value corresponding thereto according to the magnitude of noise, so that an accurate value for detecting seating can be acquired.
In contrast, referring to fig. 5b, in the case where the reference sensor 110 is connected to the seating sensor 120 as shown in fig. 2 (c), a plurality of frequency bands can be simultaneously received, and even if noise that changes with time occurs, the frequency value can be made not to change according to the magnitude of the noise. That is, the seating detection device 100 measures the capacitance change (DPFS) of the reference sensor 110 and the seating sensor 120 at the same time period, and thus can confirm that the Frequency value (Fr) of the reference sensor 110 and the Frequency value (Fs) of the seating sensor 120 are changed identically, and thus can accurately detect the seating of the user even if noise occurs. On the other hand, the Frequency generation section 130 may generate first to nth Frequency bands (N is a natural number of 2 or more) (SBF1-SBFN, Sense Band Frequency), preferably, each Frequency Band includes first to mth frequencies (M is a natural number of 2 or more) that are changed within a preset range with reference to the center Frequency, and the Frequency generation section 130 may generate a total of (NxM) frequencies. The preset range can be designated in various ways according to more than one frequency band value and user settings. For example, the first to mth frequencies may correspond to frequencies belonging to about ± 30% with respect to the center frequency. That is, in the case where the center frequency is 97Hz, the first to nth frequencies may be 68Hz, 69Hz, 99.9Hz which belong to about ± 30%.
Furthermore, the center frequencies of the first to nth frequency bands may have prime values, and each frequency band may minimize interference based on a frequency of noise occurring adjacent to the corresponding frequency band or a frequency corresponding to a positive multiple of the corresponding frequency.
That is, the center frequency of each frequency band is a prime number, and even if the sitting of the user is detected when noise occurs, only 1 to 2 frequency bands adjacent to the noise among the plurality of frequency bands transmitted to the reference sensor 110 and the sitting sensor 120 are subjected to frequency interference based on the noise as shown in (b), and thus the noise may not act as a variable in the process of detecting the sitting.
Referring again to fig. 1, the multiple calculation unit 140 detects changes in capacitance of the reference sensor 110 and the seating sensor 120 in a plurality of frequency bands generated by the frequency generation unit 130, and may calculate frequencies corresponding to the detected changes in capacitance.
More specifically, the multi-calculation part 140 regards one signal (signal) forming the frequency as one count, and may count the frequency corresponding to the capacitance change detected at the reference sensor 110 and the seating sensor 120, and calculate a calculation value for determining seating using the frequency value.
That is, the multi-calculating unit 140 can calculate the capacitance calculation value of the seating sensor 120 using the frequency value, as shown in equation 1. Also, as described above, the capacitance change is detected in a plurality of frequency bands, and the frequency count value of the seating sensor 120 is "CF" in the nth frequency bandRN", the calculated value of capacitance based thereon is" TSN", in the Nth band, can be represented by" CFRN"shows a frequency count value (α is a proportional constant) of the reference sensor 110.
The seating determination unit 150 can individually determine seating in a plurality of frequency bands based on the values calculated by the multi-calculation unit 140. For example, the capacitance calculation value (T) of the seating sensor 120 calculated in the nth frequency band in the multi-calculation section 140SN) A predetermined sensitivity value (T) greater than the Nth frequency bandTHN) In this case, the sitting determination section 150 may determine that the sitting detection in the nth frequency band is valid. Meanwhile, in this case, when the design is performed, a preset sensitivity value (T) may be arbitrarily setTHN) Depending on the use of the sitting detection device 100, various functions can be providedAnd setting the mode.
On the other hand, the above-mentioned contents may be represented by the following numerical expressions 2 and 3, "TN"is a sitting judgment in the nth frequency band. I.e. if T N1, is regarded as sitting in the corresponding frequency band, if TN0, it is considered to be not seated in the corresponding band.
Mathematical formula 2
TN＝1，if TSN≥TTHN
Mathematical formula 3
TN＝0，if TSN＜TTHN
Thus, the seating determination unit 150 confirms that T is in a plurality of frequency bandsNThe number of valid frequency bands having a value of 1, in the case where the number of confirmations is the preset number or more, can be determined that the user sitting by the sitting detection device 100 is valid, as shown in equation 4. Wherein NT isNMeans that it is judged as TNN is an arbitrary value set when designing the seating detection device 100, N is a plurality of frequency bands, and LT is an index indicating a final seating determination result of the seating detection device 100.
Mathematical formula 4
LT＝1，if NTN≥n(1≤n≤N)
Fig. 5a to 6f are diagrams for explaining the manner in which the seating determination section 150 determines seating in a plurality of frequency bands according to various embodiments of the present invention, and the seating determination section 150 may determine whether the seating detection device 100 is seated or not by using various conditions and result values.
First, fig. 6a shows a case where a user sits on the detection device 100 in a normal state where noise does not occur, sitting is detected in a plurality of frequency bands, and a capacitance calculation value (T) is calculatedS1、TS2、TS3、TS4) Greater than a predetermined sensitivity value (T)THN) Therefore, the sitting determination section 150 may determine that the sitting of the user is detected in the sitting detection device 100 (LT ═ 1, Touch on).
Next, fig. 6b shows a case where the user is not seated in the detecting device 100 in the normal state, and the calculated value of the capacitance (T) is calculated in a plurality of frequency bandsS1、TS2、TS3、TS4) Less than a predetermined sensitivity value (T)THN) Therefore, the seating determination unit 150 determines that the seating detection device 100 does not detect the seating of the user (LT ═ 0, Touch off).
Next, fig. 6c and 6d show the capacitance calculated value (T) in 1-2 frequency bands of the plurality of frequency bands determined by the noise when the user is not seated in the detecting device 100 in the noise stateSN) Greater than a predetermined sensitivity value (T)THN)，T N1 or more, the number of valid frequency bands is less than the number of preset frequency bands (e.g., n is 3), and the sitting determination part 150 may determine that the sitting of the user is not detected (LT is 0, Touch off).
Finally, fig. 6e and 6f show the calculated capacitance value (T) in one of the frequency bands determined by sitting and noise when the user sits on the sitting detection device 100 in a noisy stateSN) Less than a predetermined sensitivity value (T)THN)，TNThe number of valid frequency bands is equal to or greater than 1, the number of valid frequency bands is equal to the number of preset frequency bands (for example, n is 3), and the sitting determination unit 150 may determine that the sitting of the user is detected (LT is 1, Touch on)
That is, the sitting determination unit 150 confirms sitting among a plurality of frequency bands, adds the number of frequency bands for confirming that sitting is effective, and improves the discrimination of noise together with effective sitting of the user.
Fig. 7 is a diagram for explaining a manner in which the multiple calculating units 140 cluster frequencies according to an embodiment of the present invention.
Referring to fig. 7, the seating determination section 150 may use a plurality of frequency bands for more accurate seating detection. More specifically, the multiple calculating sections 140 may newly cluster the frequencies sequentially listed according to the frequency value before the seating judging section 150 judges seating using the capacitance calculation value and the reference calculation value.
That is, if (a) the multiple calculation unit 140 clusters the multiple frequency bands (SBF1, SBF2, … SBFN) based on the frequencies that sequentially change within a predetermined range from the center frequency, then (b) the multiple calculation unit 140 may collect the frequencies corresponding to the first to nth frequencies in the multiple frequency bands (SBF1, SBF2, … SBFN), and cluster the collected frequencies into the first to nth synthesized frequency bands (MSBF1, … MSBFN).
As described above, the multi-calculating section 140 sets the frequency value having no predetermined rule as one frequency band, instead of setting the frequency values having continuity as one frequency band, on the basis of which the seating determination section 150 determines seating, and can disperse the influence of noise, and can improve the accuracy of the capacitance calculation value for seating determination.
Reference is again made to fig. 1 for explanation.
The control unit 160 may control the operation of the seating detection device 100 as a whole. More specifically, the control section 160 may sequentially process the functions of the frequency generation section 130, the multi-calculation section 140, and the sitting determination section 150 in order to determine whether the sitting detection by the user is effective. For this purpose, the control Unit 160 may be formed of one of a Central Processing Unit (CPU), a Micro Processing Unit (MPU), a Micro Control Unit (MCU), and a control Unit of a known type in the art to which the present invention pertains.
Then, the power supply part 170 may supply power required for the sitting detection device 100 to detect sitting of the user. For example, the power supply unit 170 can supply 3 to 5.5V power.
Finally, the output part 180 may execute the function that has been set in the seating detecting device 100 according to the seating determination by the seating determination part 150. For example, in the case where the seating detection device 100 is connected to a toilet stool, the output part 180 drives a Light Emitting Diode (LED) connected in a wired or wireless manner, or performs preset various functions such as an electric heating wire that heats the toilet stool, according to the seating detection of the seating determination part 150.
The seating detection device 100 according to the embodiment of the present invention is described above. According to the present invention, the sitting detection device 100 simultaneously transmits a frequency band to the reference sensor 110 and the sitting sensor 120, and observes a change in capacitance in the state of the transmitted frequency band, thereby minimizing an influence due to noise and accurately detecting sitting of the user.
Also, the center frequency value of the frequency band is composed of prime numbers, and the frequency value for sitting detection can be accurately calculated by minimizing the influence based on the multiple frequency corresponding to the positive number multiple in addition to noise.
Fig. 8 is a flowchart showing a flow of a sitting detection method using the sitting detection apparatus 100 according to an embodiment of the present invention. Fig. 9 is a flowchart illustrating steps S130 and S140 shown in fig. 8.
This is merely a preferred embodiment for achieving the object of the present invention, and a part of the steps may be added or deleted as necessary, and further, one step may be included in other steps.
First, the seating detection device 100 sequentially generates a plurality of frequency bands (SBF1 to SBFN), and simultaneously transmits the generated plurality of frequency bands (SBF1 to SBFN) to the seating sensor 120 and the reference sensor 110 (step S110). In this case, N is a natural number of 2 or more among the plurality of frequency bands (SBF1 to SBFN) generated by the seating detection device 100, each frequency band is formed of the first to mth frequencies that change within a preset range with reference to the center frequency, the center frequency has a prime value, and the influence of frequencies that are multiples of positive numbers based on each frequency band can be minimized.
After step S110, the seating detection device 100 detects changes in capacitance of the seating sensor 120 and the reference sensor 110 in a plurality of frequency bands (SBF1 to SBFN) (step S120), and calculates frequencies corresponding to the detected changes in capacitance (step S130).
More specifically, referring to fig. 9, the seating detection device 100 regards one signal (signal) forming the frequency as one count, whereby the frequency corresponding to the change in capacitance detected in the reference sensor 110 and the seating sensor 120 can be counted, and the capacitance calculation value of the seating sensor 120 is calculated in a plurality of frequency bands (SBF1 to SBFN) by the frequency counted in the reference sensor 110 and the seating sensor 120 (step S132).
After step S130, the seating detection device 100 individually determines seating in the plurality of frequency bands (SBF1 to SBFN) based on the calculated frequency values (step S140).
More specifically, the seating sensor 120 has the same capacitance variation value as the reference sensor 110 by external noise such as power supply noise, and has a capacitance variation value greater than that of the reference sensor 110 in the case where seating of the user is detected. Thereby, the seating detection device 100 determines whether the capacitance calculation value of the seating sensor 120 has a value greater than a preset sensitivity value in the frequency band (step S141).
In the case where the calculated value of the capacitance of the seating sensor 120 is larger than the preset sensitivity value according to the judgment at step S141, the seating detection device 100 judges that the seating detection is valid in the corresponding frequency band (YES at step S142), and judges that valid seating is detected in several frequency bands (SBF1 to SBFN).
In contrast, according to the judgment of step S141, in the case where the calculated value of the capacitance of the seating sensor 120 is smaller than the preset sensitivity value, the seating detection device 100 judges that the seating detection in the corresponding frequency band is invalid (step S141, NO).
After step S142, the sitting detection device 100 confirms the number of the effective frequency bands, and determines whether the effective number is greater than or equal to the preset number of frequency bands (step S143). That is, the seating detection device 100 may set in advance the number of frequency bands in which the seating detection of the user is determined among the N frequency bands.
As a result of the determination in step S143, in the case where the number of valid frequency bands is greater than or equal to the preset number of frequency bands, the sitting detection device 100 finally determines that the sitting of the user is valid (YES in step S145), and in the case where it is less than the preset number of frequency bands, finally determines that the sitting of the user is invalid (NO in step S146).
The seating detection method of the seating detection device 100 according to the embodiment of the present invention is described above. According to the present invention, the sitting detection device 100 transmits the same frequency to the reference sensor 110 and the sitting sensor 120 in order to more accurately observe the change in capacitance, and does not use a preset reference value in the process of observing the change in capacitance due to noise or sitting, thereby newly setting a reference value according to the situation, and improving the accuracy for determining sitting. That is, according to the present invention, even if noise occurs according to external temperature and humidity, whether a user is seated or not is determined in a plurality of frequency bands, so that the user can be accurately determined to be seated.
In another aspect, the present invention can also be embodied as computer readable codes in a computer readable recording medium. The computer readable recording medium includes all storage media such as a magnetic storage medium, an optical reading medium, and the like. Further, the data format of the message used in the present invention may be recorded on a recording medium.
The embodiments of the present invention have been described above with reference to the drawings, and those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical idea or essential features of the present invention. Therefore, the embodiments of the above technology are merely exemplary in all aspects and are not intended to limit the present invention.
Claims (16)
1. A seating detection device, comprising:
a reference sensor;
a seating sensor connected to the reference sensor and varying a capacitance according to seating;
a frequency generating unit connected to the seating sensor and the reference sensor, and sequentially generating a plurality of frequency bands;
a plurality of calculation units that detect changes in capacitance of the seat sensor and the reference sensor in a plurality of frequency bands generated by the frequency generation unit, and calculate frequencies corresponding to the detected changes in capacitance; and
a sitting determination unit for individually determining sitting in the plurality of frequency bands based on the calculated values calculated by the plurality of calculation units.
2. A seating detection device according to claim 1, wherein the frequency generation unit transmits the plurality of frequency bands to the seating sensor and the reference sensor at the same time.
3. Seating detection device according to claim 2,
the plurality of frequency bands are formed by a first frequency band to an Nth frequency band, wherein N is a natural number more than 2,
the first to nth frequency bands are formed of first to mth frequencies that vary within a preset range with respect to respective center frequencies, where M is a natural number of 2 or more.
4. A seating detection device as claimed in claim 3, wherein the center frequency value has a prime value in the first to nth frequency bands.
5. A sitting detection device as claimed in claim 3 wherein the multi-calculating section collects a plurality of frequencies corresponding to first to mth frequencies respectively among the plurality of frequency bands, and groups the collected plurality of frequencies into first to mth synthesis frequency bands.
6. A seating detection device according to claim 1, wherein the multiple calculation unit counts frequencies corresponding to changes in capacitance detected by the seating sensor and the reference sensor, and calculates capacitance calculation values of the seating sensor in the plurality of frequency bands, respectively.
7. A seating detection device as claimed in claim 6,
the seating determination part determines that seating detection in a corresponding frequency band is valid in a case where a capacitance calculation value of the seating sensor is greater than or equal to a preset sensitivity value,
when the number of frequency bands determined to be valid is equal to or greater than a predetermined number, it is determined that the seating of the seating detection device is valid.
8. A seating detection device according to claim 2, wherein the seating sensor and the reference sensor change capacitance in the same manner when noise that changes with time occurs in the seating detection device.
9. A sitting detection method which is a sitting detection method of a sitting detection device, the sitting detection device comprising:
a reference sensor;
a seating sensor connected to the reference sensor and varying a capacitance according to seating;
a frequency generating unit connected to the seating sensor and the reference sensor, and sequentially generating a plurality of frequency bands; and
a multi-calculating part connected with the frequency generating part for judging sitting,
the sitting detection method is characterized by comprising the following steps:
detecting a change in capacitance of the seat sensor and the reference sensor in the plurality of frequency bands;
calculating a frequency corresponding to each of the detected capacitance changes; and
and a step of individually determining the seating detection in each of the plurality of frequency bands based on the calculated frequency values.
10. A seating detection method according to claim 9,
the plurality of frequency bands are formed by a first frequency band to an Nth frequency band, wherein N is a natural number more than 2,
the first to nth frequency bands are formed of first to mth frequencies that vary within a preset range with respect to respective center frequencies, where M is a natural number of 2 or more.
11. A seating detection method according to claim 10, wherein the center frequency value has a prime value in the first to nth frequency bands.
12. A seating detection method according to claim 10,
before the step of detecting the capacitance change, the method further includes the step of collecting a plurality of frequencies corresponding to the first to nth frequencies in the plurality of frequency bands and grouping the collected frequencies into a first to nth synthesized frequency bands,
the step of detecting the capacitance change is a step of detecting capacitance changes of the seating sensor and the reference sensor in first to mth sub-bands of the cluster.
13. A seat detection method as set forth in claim 9, wherein the step of calculating the frequency further comprises the step of counting frequencies corresponding to changes in capacitance detected by the seat sensor and the reference sensor and calculating calculated values of capacitance of the seat sensor in the plurality of frequency bands, respectively.
14. A seating detection method as claimed in claim 13, wherein the step of individually judging the seating detection further comprises:
comparing the calculated capacitance value of the seating sensor with a preset sensitivity value; and
and a step of judging that the seating detection in the corresponding frequency band is valid when the capacitance calculation value of the seating sensor is greater than or equal to the capacitance reference calculation value as a result of the comparison.
15. A seating detection method according to claim 14, further comprising a step of determining that seating by the seating detection device is valid when the number of frequency bands for which seating detection is valid is determined to be equal to or greater than a preset number after the step of determining.
16. A seating detection method according to claim 9,
the seating sensor and the reference sensor simultaneously receive the plurality of frequency bands,
when the seating detection device generates noise that changes with time, the seating sensor and the reference sensor change the capacitance in the same manner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020190041784A KR102193785B1 (en) | 2019-04-10 | 2019-04-10 | Seating detection device |
| KR10-2019-0041784 | 2019-04-10 |
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| CN111813276A true CN111813276A (en) | 2020-10-23 |
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| CN201910355528.3A Pending CN111813276A (en) | 2019-04-10 | 2019-04-29 | Sitting detection device |
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Cited By (1)
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| WO2022170590A1 (en) * | 2021-02-10 | 2022-08-18 | 深圳市汇顶科技股份有限公司 | Method for determining capacitance reference, apparatus for determining capacitance reference, and device |
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| KR20200119517A (en) | 2020-10-20 |
| KR102193785B1 (en) | 2020-12-21 |
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