JP2009084791A - Toilet bowl flushing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide toilet bowl flushing equipment using a Doppler sensor which reduces a malfunction of a toilet bowl flushing valve caused by disturbance, and avoids deterioration in the accuracy of the control of the toilet bowl flushing valve caused by a specific moving body. <P>SOLUTION: This toilet bowl flushing equipment comprises the Doppler sensor 2, and a control means 3 which determines the specific moving body 10 by an effect that the level of a first frequency band B of a doppler signal from the Doppler sensor 2 is a first level TB, and controls the toilet bowl flushing valve 50 according to this determination. When the Doppler signal includes a component of a second frequency band A lower than the first frequency band and the level of a partial frequency section B1 of the first frequency band is the first one, the control means resets the other frequency section B2 except the partial frequency section B1 in the first frequency band, and determines the specific moving body by the effect that the level of the first reset frequency band is the first one. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a toilet cleaning device that detects moving objects using a Doppler sensor, controls a toilet cleaning valve such as an electromagnetic valve, and supplies cleaning water to the toilet.

  In a toilet bowl cleaning apparatus, a Doppler sensor that transmits radio waves such as microwaves and millimeter waves and receives radio waves reflected by the human body and urine to detect the movement of the human body and urine flow may be used (see Patent Document 1). ).

  In the toilet bowl cleaning device disclosed in Patent Document 1, the movement of the human body and the urine flow using the difference in the frequency of the Doppler signal obtained by the Doppler sensor (Doppler frequency: frequency difference between the transmitted radio wave and the received reflected wave). Is determined.

  However, the Doppler sensor is susceptible to disturbances such as the movement of the sealing surface due to fluctuations in the water pressure in the sewer pipe and the opening and closing of the toilet door. There is. And a toilet bowl washing | cleaning valve malfunctions by such misidentification, and useless washing water will be supplied to a toilet bowl.

For this reason, in the toilet bowl cleaning device disclosed in Patent Document 1, disturbance is caused by changing the threshold of the Doppler signal level for determining the movement of the human body according to the presence or absence of detection of urine flow by the Doppler sensor. It avoids being misclassified as human movement.
JP 2006-214156 A

  However, if the threshold of the Doppler signal level for discriminating the movement of the human body is changed so as to increase, it may be difficult to discriminate the movement of the human body to be originally discriminated.

  Therefore, the present invention can reduce erroneous determination of a specific moving body (human body) and malfunction of a toilet cleaning valve due to disturbance in a toilet cleaning device using a Doppler sensor, and a toilet cleaning valve corresponding to the specific moving body. Provided is a toilet cleaning device that can avoid a decrease in control accuracy.

  A toilet cleaning device according to one aspect of the present invention includes a toilet cleaning valve that controls the supply of cleaning water to a toilet, a Doppler sensor that transmits radio waves, receives radio waves reflected by moving objects, and generates Doppler signals. And a control means for determining a specific moving body when the level of the first frequency band in the Doppler signal is the first level and controlling the toilet flushing valve in accordance with the determination. The control means includes a component of the second frequency band, which is a low frequency band adjacent to the first frequency band of the Doppler signal, and the level of a part of the frequency portion in the first frequency band is the first level. If there is, the other frequency part excluding the part of the frequency band in the first frequency band is reset to the first frequency band, and the level of the reset first frequency band is the first level. Therefore, the specific moving object is discriminated.

  In the present invention, the first frequency band is set so as to correspond mainly to a human body (specific moving body) that approaches or separates from the toilet, and the second frequency is a low frequency band adjacent to the first frequency band. The band is set so as to mainly deal with disturbances including fluctuations in sealed water. In this case, when the component of the second frequency band is obtained and the level of a part of the frequency part in the level of the first frequency band is the first level, the sensor output of the part of the frequency part Is treated as a result of disturbance. That is, even when the level of the part of the frequency portion in the first frequency band is the first level, it is not determined that it is due to the movement of the human body, and the level of the other frequency part in the first frequency band is the first level. The movement of the human body is determined based on the level.

  Thus, according to the present invention, the second frequency band (the movement of the sealing surface, etc.) that is a low frequency band adjacent to the first frequency band (the frequency band corresponding to the movement of the human body) of the Doppler signal. If there is a component of the frequency band corresponding to (1), the motion of the human body is determined by excluding a part of the first frequency band (for example, the lower frequency band). In other words, when there is a possibility that the disturbance affects a part of the first frequency band in which the movement of the human body is detected, the movement of the human body is determined in the frequency band excluding the part of the frequency part. Thereby, it is possible to avoid a decrease in the control accuracy of the toilet flushing valve corresponding to the movement of the human body while reducing malfunction of the toilet flushing valve.

  In the above invention, on the condition that the level of the second frequency band is a second level higher than the first level, the other frequency part is reset to the first frequency band, and the second frequency band is reset. The specific moving object may be determined based on the set first frequency band level being the first level.

  When the level of the second frequency band (frequency band corresponding to disturbance) is larger than the first level, it is highly possible that the disturbance has an influence on the first frequency band. This makes it possible to determine the movement of the human body more accurately.

  In the above invention, the Doppler signal includes a component of the second frequency band, and the level of the second frequency band is a second level higher than the first level. Is the first level, and when the component of the third frequency band that is a high frequency band adjacent to the first frequency band is not obtained thereafter, the level of the other frequency part is set to the first level. The specific moving object may be determined by resetting the frequency band and determining that the level of the reset first frequency band is the first level.

  If a component of the third frequency band (frequency band corresponding to the urine flow) is not detected after detecting the movement of the human body using the first frequency band, there is a possibility that the disturbance affects the first frequency band. Is expensive. For this reason, in such a case, the movement of the human body is accurately determined by resetting the first frequency band to a frequency band excluding a part of the original frequency band of the first frequency band. It becomes possible to do.

  That is, if the level of a part of the frequency part in the first frequency band is only the first level, it is determined whether the component of the part of the frequency part is caused by disturbance or caused by the movement of the human body. Difficult to do. However, if the component of the part of the frequency part is caused by the movement of the human body, the component of the third or specific frequency band caused by the urine flow should appear after that. Therefore, when a component due to the urine flow cannot be obtained, it is possible to treat the component of the part of the frequency part as being due to disturbance. Thus, by performing the frequency part exclusion process on this condition, erroneous determination and malfunction of the toilet flushing valve can be avoided more reliably.

  And according to the toilet system including these toilet cleaning devices, it is possible to accurately supply wash water to the toilet according to the movement of the human body, and to reduce the use of wasted wash water.

  According to the present invention, in the toilet flushing device using the Doppler sensor, the control accuracy of the toilet flushing valve corresponding to the specific moving body is reduced while reducing the erroneous determination of the specific moving body and the malfunction of the toilet flushing valve due to the disturbance. Can be avoided.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, the structure of the urinal system which incorporated the toilet bowl washing | cleaning apparatus which is Example 1 of this invention is shown.

  The upper part of the urinal 1 accommodates a Doppler sensor 2 constituting a toilet cleaning device and a controller 3 as a control means. The upper lid 4 of the urinal 1 can be opened and closed, and the maintenance work of the Doppler sensor 2 and the controller 3 can be easily performed.

  On the upper back side of the urinal 1, a water supply unit 5 that supplies cleaning water to the ball portion of the urinal 1 is provided. The water supply unit 5 is provided with a toilet cleaning valve described later. A discharge port 6 is provided below the water supply unit 5 to discharge the cleaning water from the toilet cleaning valve into the ball unit.

  Moreover, the trap part 7 and the drain port 8 for forming sealed water are provided in the lower part of the ball part.

  The Doppler sensor 2 transmits radio waves such as microwaves and millimeter waves. Reference numeral 9 denotes a transmission range of radio waves from the Doppler sensor 2. When the human body 10 moves or urinates within the transmission range 9, radio waves are reflected by the human body (specific moving body) 10 and the urine 11 which are moving bodies. At this time, due to the Doppler effect, the frequency of the reflected radio wave (hereinafter referred to as a reflected wave) is shifted from the frequency of the transmitted radio wave (hereinafter referred to as a transmitted wave). Based on the frequency difference between the transmitted wave and the reflected wave, the movement of the human body 10 and the urine flow can be determined.

  FIG. 2 shows the configuration of the Doppler sensor 2 and the controller 3. In the Doppler sensor 2, reference numeral 21 denotes a transmission unit that outputs a transmission wave, and reference numeral 22 denotes a reception unit that receives a reflected wave. Reference numeral 23 denotes a difference detection unit that outputs a Doppler signal having a frequency corresponding to the frequency difference between the transmitted wave and the reflected wave.

  The Doppler signal is a signal having the following Doppler frequency ΔF.

ΔF = F _S −F _b = 2 × F _S × ν / c (1)
F _S : Transmission wave frequency (10.525 GHz)
F _b : frequency of reflected wave ν: moving speed of moving object c: speed of light (about 300 × 10 ⁶ m / s)
The Doppler sensor 2 amplifies and outputs the Doppler signal output from the difference detection unit 23 by an amplifier (not shown). In the following description, the amplified signal is referred to as a Doppler signal.

  As can be seen from the equation (1), the Doppler frequency ΔF changes according to the moving speed of the human body 10 and the urine 11 which are moving objects. Therefore, it is possible to determine whether the moving body is the human body 10 or the urine 11 from the frequency of the Doppler signal (Doppler frequency ΔF) and its level.

  Here, when the frequency of the transmission wave is 10.525 GHz, the Doppler frequency ΔF with respect to the general moving speed of the human body 10 approaching (or moving away) from the urinal 1 is, for example, a frequency band of 20 to 50 Hz. . Moreover, the Doppler frequency (DELTA) F with respect to a general urine flow velocity becomes a frequency band of 50-150 Hz, for example.

  However, the Doppler sensor 2 also detects disturbances such as the movement of the sealing surface accompanying the fluctuation of the water pressure in the sewer pipe connected to the drain port 8 and the opening and closing of the toilet door close to the toilet 1. The Doppler frequency ΔF with respect to the movement of the sealing surface is, for example, a frequency band of 0 to 35 Hz. That is, the frequency band of the Doppler signal corresponding to the movement of the sealing surface and the frequency band of the Doppler signal corresponding to the movement of the human body 10 may partially overlap. Due to the overlap of the frequency bands, the movement of the sealing surface may be erroneously determined as the movement of the human body 10.

  The controller 3 includes a frequency analysis unit 31, a determination unit 32, and a valve drive unit 33.

  The frequency analysis unit 31 analyzes the level of a component for each predetermined frequency width in the Doppler signal output from the Doppler sensor 2 by fast Fourier transform (FFT). In this embodiment, 0 to 150 Hz is divided by a width of 5 Hz, and the level of the Doppler signal at each 5 Hz width (frequency portion) is analyzed.

  In the following description, components of each frequency band and frequency portion of the Doppler signal obtained from the Doppler sensor 2 are referred to as Doppler signals of those frequency bands and frequency portions.

  FIG. 3 shows an example of the frequency analysis result of the Doppler signal obtained from the Doppler sensor 2. In FIG. 3, the horizontal axis indicates the frequency, and the vertical axis indicates the Doppler signal level (output level). A frequency band (0 to 20 Hz) indicated by A is a frequency band (second frequency band: hereinafter referred to as a sealed water frequency band) of a Doppler signal mainly appearing corresponding to the movement of the sealed surface. A frequency band (20 to 50 Hz) indicated by B is a frequency band (first frequency band: hereinafter referred to as a human body frequency band) of a Doppler signal that appears mainly corresponding to the movement (approach and separation) of the human body.

  Furthermore, a frequency band (50 to 150 Hz) indicated by C is a frequency band of a Doppler signal that appears mainly corresponding to the urine flow (third frequency band and specific frequency band: hereinafter referred to as a urine flow frequency band). The vertical bar in the figure indicates the Doppler signal level for each 5 Hz width. This is the same for other frequency analysis results described later. Further, the adjacent frequency bands referred to here are adjacent to each other with 20 Hz as a boundary, such as a frequency band indicated by A (0 to 20 Hz) and a frequency band indicated by B (20 to 50 Hz). Indicates. Actually, a dead band with a certain width may be provided between A and B. The same applies to B and C, and a region including commercial power supply frequencies of 50 Hz and 60 Hz is excluded from the detection determination region.

  In this figure, since the level of the Doppler signal in the human body frequency band B is higher than the human body discrimination threshold TB, the movement of the human body 10 is discriminated by the discriminating unit 33 described later. Note that a level higher than the human body discrimination threshold TB corresponds to a “first level” in the claims. In the present embodiment and Example 2 described later, “higher than (the discrimination threshold)” may or may not include the same value as the discrimination threshold.

  The determination unit 32 determines (detects) the movement of the human body 10 and the presence or absence of the urine flow 11 based on the level of the Doppler signal for each predetermined frequency width analyzed by the frequency analysis unit 31.

  When the level of the Doppler signal as shown in FIG. 3 is obtained, the determination unit 32 determines the movement of the human body 10 (here, the approach to the toilet 1) as described above.

  In FIG. 3, the Doppler signal as noise also appears in the sealed water and urine flow frequency bands A and C with the movement of the human body 10, but the level is based on the sealed water and urine flow discrimination thresholds TA and TC. Therefore, it is not determined as the movement of the sealing surface or the urine flow.

  FIG. 4 shows an example of the frequency analysis result of another Doppler signal. In this figure, since the level of the Doppler signal is higher than the sealing water determination threshold TA in the sealing frequency band A, it is considered that there is a movement of the sealing surface. However, even in a part of the human body frequency band B adjacent to the sealed water frequency band A (here, a frequency part of 20 to 25 Hz), the level of the Doppler signal as noise accompanying the movement of the sealed surface is the human body. It is higher than the discrimination threshold TB. For this reason, conventionally, it is erroneously determined that the human body 10 is approaching by the Doppler signal as the noise.

  Therefore, in this embodiment, as shown in FIG. 4, a Doppler signal having a level higher than the sealing water discrimination threshold TA appears in the sealing frequency band A, and the human body in a part of the frequency band B1 of the human body frequency band B When a Doppler signal having a level higher than the discrimination threshold TB (first level) appears (hereinafter referred to as the first case), the frequency portion B1 is excluded from the human body frequency band B as shown in FIG. . Thereby, thereafter, as the human body frequency band B, the frequency band B ′ corresponding to the other frequency part B2 excluding the frequency part B1 is reset. The process of excluding the frequency part B1 from the human body frequency band B in this way is hereinafter referred to as frequency part excluding process.

  The frequency part exclusion process can also be referred to as a frequency band changing process for changing the human body frequency band B to the human body frequency band B ′.

  By performing such frequency part exclusion processing, even if the level of the Doppler signal in the frequency part B1 is higher than the human body discrimination threshold TB, the level of the Doppler signal in the frequency part B2 (the human body frequency band B ′ after the change) is Since it is lower than the discrimination threshold TB, it can be avoided that the human body 10 is erroneously discriminated by the Doppler signal of the frequency portion B1. Thereafter, the approach of the human body 10 is determined according to the level of the Doppler signal in the human body frequency band B ′ after the change being higher than the human body determination threshold value TB (the first level).

  In FIG. 5, the sealing frequency band A is changed to include the frequency portion B <b> 1 in accordance with the change of the human body frequency band B to the human body frequency band B ′. There is no need to change to include part B1.

  Further, FIG. 5 illustrates the case where the frequency partial exclusion process is performed on the condition that the Doppler signal having a level higher than the sealing water determination threshold TA in the sealing frequency band A is performed. However, the Doppler in the sealing frequency band A is described. The condition is that the signal appears and the Doppler signal level is higher than the sealed water discrimination threshold TA.

  FIG. 6 shows another example of the frequency analysis result of another Doppler signal. In this figure, the level of the Doppler signal in the frequency band A is lower than the sealing water determination threshold TA, but the level of the Doppler signal of only the frequency portion B1 in the frequency band B is higher than the human body determination threshold TB. On the other hand, when the human body 10 is actually approaching, as shown in FIG. 3, the level of the Doppler signal is often higher than the human body discrimination threshold TB in a wider range of the frequency band B including the frequency portion B1, There may be a case where the level of the Doppler signal becomes higher than the human body discrimination threshold TB only in the frequency portion B1. Therefore, in the state shown in FIG. 6, it cannot be clearly determined whether the Doppler signal of the frequency portion B1 is due to the movement of the sealing surface or the approach of the human body 10.

  However, the human body 10 approaching the toilet 1 should urinate after this, and as a result, as shown by a one-dot chain line in FIG. 6, the Doppler signal having a level higher than the urine flow discrimination threshold TC in the frequency band C. Should appear. In other words, if a Doppler signal having a level higher than the urine flow discrimination threshold TC does not appear, the Doppler signal of the frequency portion B1 can be regarded as not due to the approach of the human body 10 but due to the movement of the sealing surface.

  Therefore, in this embodiment, when a Doppler signal appears in the frequency band A and a Doppler signal having a level higher than the human body discrimination threshold TB appears in a part of the frequency portion B1 of the frequency band B, the urine flow is thereafter When a Doppler signal having a level higher than the urine flow discrimination threshold TC does not appear in the frequency band C (hereinafter referred to as the second case), the frequency portion B1 is excluded from the frequency band B as described in FIG. Frequency part exclusion processing (or frequency band change processing) to be performed.

  That is, as shown in the upper diagram of FIG. 7, when the level of the Doppler signal of the frequency portion B1 is higher than the human body discrimination threshold TB at time t1, the urine flow discrimination threshold TC in the urine flow frequency band C by time t2. If a higher level Doppler signal appears, the frequency portion exclusion process is not performed. On the other hand, as shown in the lower diagram of FIG. 7, when the level of the Doppler signal of the frequency portion B1 is higher than the human body discrimination threshold TB at time t1, the urine flow discrimination threshold TC in the urine flow frequency band C by time t2. If a high-level Doppler signal does not appear, frequency part exclusion processing is performed.

  As a result, as in the first case (FIG. 5) described above, even if the level of the Doppler signal in the frequency portion B1 is higher than the human body discrimination threshold TB, the Doppler in the frequency portion B2 (changed human body frequency band B ′). Since the level of the signal is lower than the human body discrimination threshold TB, it can be avoided that the human body 10 is erroneously discriminated by the Doppler signal of the frequency portion B1. Thereafter, the approach of the human body 10 is determined in accordance with the level of the reset Doppler signal in the human body frequency band B ′ being higher than the human body determination threshold value TB (the first level).

  Even when the Doppler signal as shown in FIG. 4 is obtained (first case), the condition is that the Doppler signal having a level higher than the urinary flow discrimination threshold TC in the urinary flow frequency band C appears as described above. Frequency part exclusion processing can also be performed. In this case, since the condition for performing the frequency part exclusion process in the first case can be made stricter, the frequency part exclusion process can be performed more appropriately.

  As described above, according to the present embodiment, even if the level of the Doppler signal of the frequency portion B1 is higher than the human body discrimination threshold TB due to the movement of the sealing surface as in the first and second cases, It is possible to avoid erroneously determining that there is 10 approaches.

  Conventionally, in order to avoid erroneous determination, a method as shown in FIG. 8 has been adopted. That is, as shown in the left diagram of FIG. 8, when a Doppler signal having a level higher than the human body discrimination threshold TB appears in the frequency portion B1 due to the movement of the sealing surface, as shown in the right diagram, The human body discrimination threshold value TB in the frequency band B is changed to a higher TB ′. Thereby, since the Doppler signal of the frequency part B1 becomes lower than the human body discrimination threshold TB ′, the possibility of being erroneously discriminated as being due to the approach of the human body 10 can be reduced.

  However, when the human body discrimination threshold TB ′ is changed to be higher, there is a higher possibility that the level of the Doppler signal in the human body frequency band B actually generated by the approach of the human body 10 is lower than the human body discrimination threshold TB ′. That is, there is a high probability that the determination of the movement of the human body 10 will fail.

  In contrast, in the present embodiment, in the first and second cases described above, the frequency portion B1 is excluded from the human body frequency band B without changing the human body discrimination threshold TB (changed to the human body frequency band B ′). I am doing so. For this reason, if a Doppler signal actually appears in the human body frequency band B ′ due to the approach of the human body 10, it becomes higher than the human body discrimination threshold TB with a high probability. Therefore, the probability that the determination of the movement of the human body 10 fails can be suppressed to a low level, and a decrease in the accuracy of the determination can be avoided.

  In addition, the discrimination | determination part 32 discriminate | determines the separation of the human body 10 when the level of the Doppler signal of the human body frequency band B (or B ') is higher than the human body discrimination threshold TB again after discriminating the approach of the human body 10. When discriminating the separation of the human body 10, the human body frequency band B and the human body discrimination threshold TB may be made different from those when the approach of the human body 10 is discriminated.

  The valve drive unit 33 shown in FIG. 2 controls the toilet flushing valve 50 according to the determination result in the determination unit 32. As the toilet flushing valve 50, a valve that can be controlled by an electric signal such as an electromagnetic valve can be used. In the following description, the toilet flushing valve 50 is an electromagnetic valve. When the determination unit 32 detects the approach of the human body 10, the valve drive unit 33 opens the toilet cleaning valve 50 for a predetermined pre-cleaning time and supplies cleaning water to the toilet 1 (ball unit). So-called pre-cleaning is performed to make it less likely to cause urine stones to accumulate on the ball portion.

  In addition, when the determination unit 32 determines that the urine flow is present, and further determines that the human body 10 is separated, the valve driving unit 33 opens the toilet flushing valve 50 for a predetermined main cleaning time, thereby opening the toilet 1 Supply cleaning water to the (ball part) and perform the main cleaning.

  Hereinafter, a processing procedure in the controller 3 (the determination unit 32 and the valve driving unit 33) will be described with reference to a flowchart of FIG. This process is executed according to a computer program stored in a memory (not shown) in the controller 3.

  In the above description, for the sake of convenience, the determination unit 32 has been described as determining whether there is water sealing, the movement of the human body 10, and the presence of the urine flow itself. However, in practice, the determination unit 32 determines whether the Doppler signal level is higher than the determination threshold values TA, TB, and TC in the three frequency bands A, B, and C. And urine flow discrimination processing.

  First, in step (abbreviated as S in the figure) 112, the determination unit 32 determines that the level of the Doppler signal DB of a part of the frequency portion B1 in the human body frequency band B among the Doppler signals from the Doppler sensor 2 is the human body determination threshold value. It is determined whether it is higher than TB (whether it is the first level). The frequency part B1 can be set as, for example, one or more 5 Hz wide frequency parts adjacent to the sealed water frequency band A. As described above, “whether it is higher than the human body discrimination threshold TB” may be “whether it is higher than the human body discrimination threshold TB”. This also applies to the determination of the magnitude relationship between other Doppler signals and a determination threshold, which will be described later. When the level of the Doppler signal DB is higher than the human body discrimination threshold TB, the process proceeds to step 113, and when it is lower than the human body discrimination threshold TB, this step is repeated.

  In step 113, the determination unit 32 determines whether or not the Doppler signal from the Doppler sensor 2 includes the Doppler signal DA in the sealed water frequency band A. When the Doppler signal DA is included, it is further determined whether or not the level of the Doppler signal DA in the sealing frequency band A is higher than the sealing water determination threshold TA. If it is higher than the sealed water determination threshold TA, the process proceeds to step 114. If it is lower than the sealed water determination threshold TA (and the Doppler signal DA is not included), the process proceeds to step 117.

  In step 114, the determination unit 32 resets another frequency part (B2) obtained by removing the frequency part B1 from the human body frequency band B as a new human body frequency band B (B ′). In other words, a frequency part exclusion process for excluding the frequency part B1 from the original human body frequency band B (or a frequency band changing process for changing the human body frequency band B to the human body frequency band B ′ corresponding to the frequency part B2) is performed. Then, the process proceeds to step 115.

  In step 115, the determination unit 32 determines whether or not the level of the Doppler signal DB in the human body frequency band B reset in step 114 is higher than the human body determination threshold value TB. When the level of the Doppler signal DB is higher than the human body discrimination threshold TB, it is assumed that the human body 10 is approaching, and the process proceeds to Step 117. On the other hand, when the level of the Doppler signal DB is lower than the human body discrimination threshold TB, it is assumed that the Doppler signal DB having a level higher than the human body discrimination threshold TB obtained in Step 112 is caused by the movement of the sealing surface. Proceed to step 116.

  In step 116, the determination unit 32 resets the human body frequency band B to the original human body frequency band B (before resetting in step 114) (returns to the initial value). Then, the process returns to step 112.

  In step 117, the valve drive unit 33 opens the toilet flush valve 50 in response to the approach of the human body 10, and the determination unit 32 starts counting a first timer for measuring a first predetermined time ( ON). Thereby, pre-cleaning is started.

  Subsequently, at step 118, the valve drive unit 33 determines whether or not the measurement of the first predetermined time by the first timer has ended. If the measurement has not ended, repeat this step again. On the other hand, when the measurement is completed, the process proceeds to step 119, and the toilet flushing valve 50 is closed. Thereby, pre-cleaning is completed.

  Next, in step 120, the determination unit 32 starts (ON) the count of the second timer for measuring the second predetermined time.

  In step 121, the determination unit 32 determines whether or not a Doppler signal DC having a level higher than the urine flow determination threshold TC is obtained in the urine flow frequency band C. This determination is a determination as to whether or not urine flow has occurred after the Doppler signal DB having a level higher than the human body discrimination threshold TB is obtained in the human body frequency band B. In other words, it is a determination as to whether or not the Doppler signal DB having a level higher than the human body discrimination threshold TB is due to the approach of the human body 10. If a Doppler signal DC having a level higher than the urine flow discrimination threshold TC is obtained, the process proceeds to step 124. If a Doppler signal DC having a level higher than the urine flow discrimination threshold TC cannot be obtained, the process proceeds to step 122.

  In step 122, the determination unit 32 determines whether or not the measurement of the second predetermined time by the second timer has ended. If the measurement has not ended, the process returns to step 121. On the other hand, when the measurement is completed, the process proceeds to step 123 on the assumption that the Doppler signal DB having a level higher than the human body discrimination threshold TB determined in step 115 is caused by the movement of the sealing surface.

  In step 123, the determination unit 32 resets another frequency part (B2) obtained by removing the frequency part B1 from the human body frequency band B as a new human body frequency band B (B ′). Alternatively, the sealing water determination threshold value TA is changed so as to be lowered to the level of the Doppler signal DA in the sealing water frequency band A detected in Step 113. Then, the process returns to step 112.

  In step 124, the determination unit 32 determines whether or not the Doppler signal DC has become lower than the urine flow determination threshold TC (whether or not urination has ended). If the Doppler signal DC is not lower than the urine flow discrimination threshold TC (if urination is still ongoing), this step is repeated. On the other hand, when the Doppler signal DC becomes lower than the urine flow discrimination threshold TC, the routine proceeds to step 125.

  In step 125, the determination unit 32 determines whether or not the level of the Doppler signal DB in the human body frequency band B is higher than the human body determination threshold value TB. The human body frequency band B and the human body discrimination threshold TB in this determination may be different from the human body frequency band B and the human body discrimination threshold TB used in the approach determination of the human body 10 in step 115. If a Doppler signal DB having a level higher than the human body discrimination threshold TB is obtained, it is assumed that the human body 10 is separated and the process proceeds to step 126. On the other hand, when the Doppler signal DB having a level higher than the human body discrimination threshold TB cannot be obtained (when the human body 10 is not yet separated), this step is repeated.

  In step 126, the valve drive unit 33 opens the toilet flush valve 50 in accordance with the separation determination of the human body 10. Further, the determination unit 32 starts (ON) the count of the third timer for measuring the third predetermined time (main cleaning time). Thereby, the main cleaning is started.

  Subsequently, in step 127, the determination unit 32 determines whether or not the measurement of the third predetermined time by the third timer is finished. If the measurement has not ended, repeat this step again. On the other hand, when the measurement is completed, the process proceeds to step 128 and the toilet flushing valve 50 is closed. Then, the process proceeds to Step 129.

  In step 129, when the human body frequency band B is reset in step 13, the determination unit 32 resets the human body frequency band B to the original human body frequency band B (returns to the initial value). Then, the process returns to step 112.

  As described above, in this embodiment, a Doppler signal in the sealed water frequency band A (a Doppler signal having a level higher than the sealed water discrimination threshold TA) is obtained, and the human body in a part of the frequency portion B1 in the human body frequency band B When a Doppler signal having a level higher than the discrimination threshold TB is obtained (first case), the Doppler signal of the frequency portion B1 is handled as being caused by the movement (disturbance) of the sealing surface.

  Further, in the present embodiment, a Doppler signal (a Doppler signal having a level lower than the sealed water discrimination threshold TA) in the sealed water frequency band A is obtained, and in a part of the frequency portion B1 in the human body frequency band B, from the human body discrimination threshold TB. When a high-level Doppler signal is obtained, and when a Doppler signal in the urine flow frequency band C is not obtained thereafter (second case), the sensor output at the frequency portion B1 is moved to the movement of the sealing surface (disturbance). ). In the first and second cases, the frequency portion B1 is excluded from the human body frequency band B (reset the human body frequency band B). In other words, the Doppler signal of the frequency part B1 is not used for the movement determination of the human body 10.

  As described above, in this embodiment, since the Doppler signal level (human body determination threshold value TB) for determining the movement of the human body 10 is not changed, the Doppler signal caused by the disturbance is excluded and the movement of the human body 10 is determined. In addition, it is possible to avoid a decrease in the control accuracy of the toilet flushing valve 50 according to the movement of the human body 10 while reducing erroneous determination of the movement of the human body 10 due to disturbance and malfunction of the toilet flushing valve 50.

  In FIG. 10, the structure of the toilet bowl washing | cleaning apparatus which is Example 2 of this invention is shown. In this embodiment, the Doppler sensor 2 is the same as that described in the first embodiment.

  The controller 103 includes an A / D converter 135, digital (D) filters 131A, 131B, and 131C, a determination unit 132, and a valve drive unit 133.

  The A / D converter 135 converts the Doppler signal (analog signal) from the Doppler sensor 2 into a digital signal.

  Each of the digital filters 131A, 131B, and 131C passes components in the sealed water frequency band A, the human body frequency band B, and the urine flow frequency band C in the digitized Doppler signal.

  Here, as shown in the table on the right side of FIG. 11, the digital filter 131 </ b> B has a plurality of human body frequency bands B as the pass frequency band of the Doppler signal that are fixed at 100 Hz on the high frequency side and increased by 5 Hz on the low frequency side. Switching can be performed in the frequency band (steps 1 to 7).

  The determination unit 132 performs basically the same processing as the determination unit 32 of the first embodiment based on outputs (Doppler signals) from the digital filters 131A, 131B, and 131C. However, the determination unit 132 controls the filter 131B so as to switch the pass frequency band in the digital filter 131B between Steps 1 to 7 as the frequency part exclusion process (or frequency band change process).

  For example, as shown in the left diagram of FIG. 11, it is assumed that the sealed frequency band A is set to a band of 0 to 20 Hz and the human body frequency band B is set to Step 3 of 20 to 100 Hz. At this time, a Doppler signal exceeding the sealing water determination threshold TA appears in the sealing frequency band A, and a Doppler signal exceeding the human body determination threshold TB in a part of the frequency band B1 (20 to 35 Hz) of the human body frequency band B. In the first case, the discriminating unit 132 sets the human body frequency band B, which is step 6 of 35 to 100 Hz, to the digital filter 131B as shown in the central view of FIG. Instruct to switch (reset) to band B ′.

  As a result, the same processing as the resetting of the human body frequency band B (frequency part exclusion processing or frequency band changing processing) in the first embodiment is performed. In addition, although the sealing frequency band A is not changed here, you may change the sealing frequency band A so that the frequency part B1 may be included.

  Although not shown, the determination unit 132 similarly switches the pass frequency band in the digital filter 131B in the second case described in the first embodiment.

  By using the digital filters 131A, 131B, and 131C in this way, the Doppler signals in the frequency bands A, B, and C can be obtained more easily and faster than when performing frequency analysis by FFT as in the first embodiment. Obtainable.

  FIG. 12 shows a processing procedure in the controller 3 (the determination unit 132 and the valve driving unit 133) in the present embodiment. This process is executed according to a computer program stored in a memory (not shown) in the controller 103.

  First, in step 210, the determination unit 132 determines whether or not the Doppler signal DC obtained in the urinary flow frequency band C is higher than the urine flow determination threshold TC. If the Doppler signal DC is higher than the urine flow threshold TC, the process proceeds to step 211. If the Doppler signal DC is lower than the urinary flow frequency band C, the process proceeds to step 212.

  In step 211, the setting range of the human body frequency band B is switched to one smaller step in the table shown in FIG. 11 (reset). For example, the setting range of the human body frequency band B is switched from step 2 to step 1 shown in FIG. And it progresses to step 224 mentioned later.

  In step 212, the determination unit 132 determines whether or not the level of the Doppler signal DB of the partial frequency portion B1 in the human body frequency band B among the Doppler signals from the Doppler sensor 2 is higher than the human body determination threshold value TB (first step). Or not). The initial setting range of the human body frequency band B is step 1 shown in FIG. Moreover, the frequency part B1 can be set as, for example, one or more 5 Hz wide frequency parts adjacent to the sealed water frequency band A. If the level of the Doppler signal DB is higher than the human body discrimination threshold TB, the process proceeds to step 213, and if it is lower than the human body discrimination threshold TB, the process returns to step 210.

  In step 213, the determination unit 132 determines whether or not the Doppler signal from the Doppler sensor 2 includes the Doppler signal DA in the sealed water frequency band A. When the Doppler signal DA is included, it is further determined whether or not the level of the Doppler signal DA in the sealing frequency band A is higher than the sealing water determination threshold TA. If it is higher than the sealed water determination threshold TA, the process proceeds to step 214. If it is lower than the sealed water determination threshold TA (and the Doppler signal DA is not included), the process proceeds to step 217.

  In step 214, the determination unit 132 switches (resets) the setting range of the human body frequency band B to a step larger by 1 in the table shown in FIG. For example, the setting range of the human body frequency band B is switched from step 1 to step 2 shown in FIG. Then, the process proceeds to Step 215.

  In step 215, the determination unit 132 determines whether or not the level of the Doppler signal DB in the human body frequency band B reset in step 214 is higher than the human body determination threshold TB. When the level of the Doppler signal DB is higher than the human body discrimination threshold TB, it is assumed that the human body 10 is approaching, and the process proceeds to Step 217. On the other hand, when the level of the Doppler signal DB is lower than the human body discrimination threshold TB, it is assumed that the Doppler signal DB having a level higher than the human body discrimination threshold TB obtained in Step 212 is caused by the movement of the sealing surface. Return to step 210.

  In step 217, the valve drive unit 133 opens the toilet flushing valve 50 in response to the approach of the human body 10, and the determination unit 132 starts counting the first timer for measuring the first predetermined time ( ON). Thereby, pre-cleaning is started.

  Subsequently, in step 218, the valve drive unit 133 determines whether or not the measurement of the first predetermined time by the first timer is finished. If the measurement has not ended, repeat this step again. On the other hand, when the measurement is completed, the process proceeds to step 219, and the toilet flushing valve 50 is closed. Thereby, pre-cleaning is completed.

  Next, in step 220, the determination unit 132 starts (ON) the count of the second timer for measuring the second predetermined time.

  In step 221, the determination unit 132 determines whether or not a Doppler signal DC having a level higher than the urine flow determination threshold TC is obtained in the urine flow frequency band C. This determination is a determination as to whether or not urine flow has occurred after the Doppler signal DB having a level higher than the human body discrimination threshold TB is obtained in the human body frequency band B. In other words, it is a determination as to whether or not the Doppler signal DB having a level higher than the human body discrimination threshold TB is due to the approach of the human body 10. If a Doppler signal DC having a level higher than the urine flow determination threshold TC is obtained, the process proceeds to step 224. If a Doppler signal DC having a level higher than the urine flow determination threshold TC cannot be obtained, the process proceeds to step 222.

  In step 222, the determination unit 132 determines whether the measurement of the second predetermined time by the second timer has ended. If the measurement has not ended, the process returns to step 221. On the other hand, when the measurement is completed, the process proceeds to step 223 on the assumption that the Doppler signal DB having a level higher than the human body discrimination threshold TB determined in step 215 is caused by the movement of the sealing surface.

  In step 223, the determination unit 132 switches (resets) the setting range of the human body frequency band B to a step larger by 1 in the table shown in FIG. That is, when a Doppler signal having a level higher than the human body discrimination threshold TB is obtained in a part of the frequency portion B1 in the human body frequency band B, if a Doppler signal in the urine flow frequency band C is not obtained thereafter, the frequency The sensor output at the portion B1 is treated as being caused by the movement (disturbance) of the sealing surface, and processing for removing the frequency portion B1 from the human body frequency band B is performed. Then, the process returns to step 210.

  If the determination unit 132 obtains a Doppler signal DC having a level higher than the urine flow determination threshold value TC in step 221, the determination unit 132 proceeds to step 224.

  In step 224, the determination unit 132 determines whether the Doppler signal DC has become lower than the urine flow determination threshold value TC (whether urination has ended). If the Doppler signal DC is not lower than the urine flow discrimination threshold TC (if urination is still ongoing), this step is repeated. Further, when the Doppler signal DC becomes lower than the urine flow discrimination threshold TC, the process proceeds to step 225.

  In step 225, the determination unit 132 determines whether the level of the Doppler signal DB in the human body frequency band B is higher than the human body determination threshold value TB. The human body frequency band B and the human body discrimination threshold TB in this determination may be different from the human body frequency band B and the human body discrimination threshold TB used in the approach discrimination of the human body 10 in step 215. When the Doppler signal DB having a level higher than the human body discrimination threshold TB is obtained, it is assumed that the human body 10 is separated and the process proceeds to Step 226. On the other hand, when the Doppler signal DB having a level higher than the human body discrimination threshold TB cannot be obtained (when the human body 10 is not yet separated), this step is repeated.

  In step 226, the valve driving unit 133 opens the toilet flushing valve 50 in accordance with the separation determination of the human body 10. Further, the determination unit 132 starts (ON) the count of the third timer for measuring the third predetermined time (main cleaning time). Thereby, the main cleaning is started.

  Subsequently, in step 227, the determination unit 132 determines whether or not the measurement of the third predetermined time by the third timer is finished. If the measurement has not ended, repeat this step again. On the other hand, when the measurement is completed, the process proceeds to step 228, and the toilet flushing valve 50 is closed. Then, the process returns to step 210.

  Also in this embodiment, the movement of the human body 10 is determined by excluding the Doppler signal caused by the disturbance without changing the Doppler signal level (human body determination threshold TB) for determining the movement of the human body 10, so that the movement is caused by the disturbance. It is also possible to prevent the control accuracy of the toilet flushing valve 50 from being lowered according to the movement of the human body 10 while reducing the erroneous determination of the movement of the human body 10 and the malfunction of the toilet flushing valve 50.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  For example, in each of the above-described embodiments, the case where the frequency part exclusion process is performed on the condition that the Doppler signal of the sealed water frequency band A is obtained has been described. However, even when a Doppler signal in the sealed water frequency band A is not obtained, a Doppler signal having a level higher than the human body discrimination threshold TB is obtained in a part of the frequency portion B1 in the human body frequency band B, and then the urine flow frequency band You may make it perform the frequency part exclusion process (or frequency band change process) of the human body frequency band B on the condition that a C Doppler signal is not obtained.

  Thereby, due to the movement of the sealing surface, the Doppler signal of the sealing frequency band A does not appear, but in the case where the Doppler signal of the frequency part B1 appears, the frequency part B1 can be excluded from the human body frequency band B, It is possible to avoid misidentifying the movement of the sealing surface as the movement of the human body 10.

  Further, in the present embodiment, the case where the frequency portion B1 is excluded from the human body frequency band B (the human body frequency band B is changed to another frequency band B ′) has been described in the first and second cases. However, without changing the human body frequency band B, the Doppler signal of the frequency part B1 out of the Doppler signals of the human body frequency band B is invalidated, and the movement of the person 10 is determined using only the Doppler signal of the other frequency part B2. You may do it.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the toilet system provided with the toilet bowl washing | cleaning apparatus which is Example 1 of this invention. 1 is a block diagram illustrating a configuration of a toilet bowl cleaning apparatus according to Embodiment 1. FIG. FIG. 6 is a diagram illustrating an example of a frequency analysis result of a Doppler signal in the first embodiment. FIG. 6 is a diagram illustrating another example of the frequency analysis result of the Doppler signal according to the first embodiment. FIG. 6 is a diagram illustrating frequency part exclusion processing according to the first embodiment. FIG. 10 is a diagram illustrating still another example of the frequency analysis result of the Doppler signal in the first embodiment. 3 is a time chart showing the relationship between human body detection and urine flow detection in the first embodiment. The figure which shows the change process of the conventional human body discrimination | determination threshold value. 3 is a flowchart illustrating a processing procedure in the first embodiment. The block diagram which shows the structure of the toilet bowl washing | cleaning apparatus which is Example 2 of this invention. The figure which shows the frequency band change process in Example 2. FIG. 9 is a flowchart showing a processing procedure in Embodiment 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Urinal 2 Doppler sensor 3,103 Controller 5 Water supply part 9 Sensor detection range 7 Trap part 8 Drain outlet 10 Human body 11 Urine 21 Transmission part 22 Reception part 23 Difference detection part 31 Frequency analysis part 32,132 Discriminating part 33,133 Valve Drive unit 50 Toilet bowl cleaning valve 131A, 131B, 131C Digital filter

Claims (5)

A toilet flush valve that controls the supply of flush water to the toilet;
A Doppler sensor that transmits radio waves, receives radio waves reflected by moving objects, and generates Doppler signals;
Control means for discriminating a specific moving body when the level of the first frequency band in the Doppler signal is the first level, and controlling the toilet flushing valve according to the discrimination,
The control means includes a component of a second frequency band in which the Doppler signal is a low frequency band adjacent to the first frequency band, and the level of a part of the frequency part in the first frequency band is the level If it is the first level, the other frequency parts except the part of the frequency band in the first frequency band are reset to the first frequency band, and the reset frequency band of the first frequency band is reset. The toilet cleaning device, wherein the specific moving object is determined based on the level being the first level.   The control means includes the Doppler signal including a component of the second frequency band, and a level of the second frequency band is a second level greater than the first level, and the partial frequency portion When the level of the first frequency band is the first level, the other frequency portion is reset to the first frequency band, and the level of the reset first frequency band is the first level. The toilet cleaning device according to claim 1, wherein the specific moving object is determined by the method.   The control means includes the Doppler signal including a component of the second frequency band, and a level of the second frequency band is a second level greater than the first level, and the partial frequency portion When the level of the third frequency band that is a high frequency band adjacent to the first frequency band is not obtained thereafter, the other frequency portion is set to the first level. 2. The toilet cleaning according to claim 1, wherein the specific moving object is determined by resetting the frequency band to one frequency band and determining that the level of the reset first frequency band is the first level. apparatus.   In the case where the level of the second frequency band is lower than the second level and the level of the reset first frequency portion is the first level, the control means thereafter performs the first frequency When the component of the third frequency band that is a high frequency band adjacent to the frequency band of the second frequency band is not obtained, the level of the other frequency part is reset to the first frequency band, and the reset first frequency band The toilet bowl cleaning device according to claim 2, wherein the specific moving object is determined based on a frequency band level of the first frequency level being the first level. Toilet bowl washing device according to any one of claims 1 to 4,
A toilet system, comprising: a toilet bowl that is cleaned with cleaning water from the toilet bowl cleaning valve.