JP2006274761A - Toilet bowl flushing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce electricity consumed by a Doppler sensor in a toilet bowl flushing device which detects a human body and waterflow in the toilet bowl by the Doppler sensor. <P>SOLUTION: The toilet bowl flushing device is provided with the Doppler sensor for generating a differential signal from a difference between a frequency of a transmitted electric wave and that of a reflected wave, and a control means for controlling detection of the human body and the waterflow in the toilet bowl as the objects to be detected. The control means controls the detection by making the Doppler sensor transmit the electric wave periodically in cycles according to the objects to be detected. The control means changes the on-period of the electric wave transmission from the Doppler sensor in cycles according to the objects to be detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a toilet bowl cleaning apparatus for cleaning a urinal, a toilet bowl, and the like, and more particularly, to a toilet bowl cleaning apparatus that performs human body detection and water flow detection using a Doppler sensor using a microwave or the like.

  Conventionally, in the toilet cleaning device, in order to automate the cleaning of the toilet body after the addition, when a human body detection sensor such as an infrared sensor is installed in the toilet bowl, and this human body detection sensor detects a user for a certain time or more, There is one in which a certain amount of washing water is allowed to flow by detecting that the user has left and then opening and closing an electromagnetic valve provided in the water supply channel.

  As a human body detection sensor, an infrared sensor using infrared rays is generally used, and since this sensor is inexpensive, it is widely used. However, since this human body detection sensor uses reflection of light, the installation position of the human body detection sensor is limited to a position where there is no obstacle to light. In addition, if the window becomes dirty, the detection accuracy deteriorates. In addition, in order to widen the detection range, it is necessary to increase the light output and diffuse the light, so that it is difficult to detect a wide range.

  Therefore, in recent years, toilet cleaning devices that detect human bodies with Doppler sensors using radio waves have been proposed or provided. Since this Doppler sensor uses radio waves that can pass through resin and ceramics, it can be hidden in the body cover, looks good, and is not easily mischievous. Moreover, it is possible to detect whether a person is approaching or moving away. Furthermore, not only human body detection but also urine flow and washing water can be detected by this Doppler sensor (see, for example, Patent Document 1).

  The Doppler sensor includes a transmission unit that transmits a microwave, a reception unit that receives a reflected wave of a radio wave transmitted by the transmission unit, a frequency of a signal received by the reception unit, and a signal transmitted by the transmission unit. Difference detection means for obtaining a difference from the frequency and generating a signal corresponding to the difference is provided.

  And this Doppler sensor is used for the object (motion) detection by the following principle using the Doppler effect by an electromagnetic wave.

Basic formula: ΔF = FS−Fb = 2 × FS × ν / c
ΔF: Doppler frequency FS: Transmission frequency Fb: Reflection frequency ν: Moving speed of object c: Speed of light (300 × 10 ⁶ m / s)
The FS transmitted from the antenna is reflected by the object, and becomes Fb after receiving the Doppler frequency shift due to the relative motion ν. At this time, the frequency difference ΔF between the transmitted wave and the reflected wave can be extracted as an output signal.

Since the distance between the antenna and the object to be detected (human body, urine flow, etc.) is inversely proportional to the amplitude of ΔF, the frequency spectrum of ΔF is analyzed to determine whether the person is approaching or moving away. It is possible to detect whether or not there is a water flow in the toilet bowl.
International Publication No. 03/021052 Pamphlet

  By the way, in the toilet cleaning device, in order to improve workability and maintainability and save energy, a generator that generates electricity by rotating the impeller is installed in the cleaning water supply channel, and the power of this generator is opened and closed by a solenoid valve. There is an increasing demand for a toilet cleaning device with a built-in generator that is used as a power source.

  However, although the toilet cleaning device of Patent Document 1 can detect the human body and the water flow in the toilet using the Doppler sensor, the Doppler sensor is operated continuously, so that the power consumption is low. It gets bigger. Therefore, it cannot be easily applied to a toilet cleaning device of a built-in generator type.

  Accordingly, an object of the present invention is to reduce power consumption by a Doppler sensor in a toilet cleaning device that detects a human body and a water flow in a toilet using a Doppler sensor.

  In order to solve this problem, the invention according to claim 1 generates a difference signal from the difference between the frequency of the transmitted radio wave and the frequency of the reflected wave in the toilet flushing apparatus capable of supplying flush water into the toilet bowl body. A Doppler sensor that performs detection control on the human body and running water in the toilet as a detection target, and the control means intermittently transmits radio waves from the Doppler sensor at a period according to the detection target. Thus, the detection control is performed.

  The invention according to claim 2 is the invention according to claim 1, characterized in that the control means performs intermittent reception of the reflected wave in synchronization with intermittent transmission of the radio wave. To do.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the control means causes the radio wave to be intermittently transmitted in an on-time according to the detection target. It is characterized by.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a signal in the first frequency band is extracted from the difference signal to detect the presence or absence of a human body. And a water flow detecting means for extracting a signal in the second frequency band from the difference signal and detecting the presence or absence of a water flow in the toilet.

  The invention according to claim 5 is the invention according to claim 4, wherein the control means changes the detection target based on a detection result of the human body detection means and / or the water flow detection means. It is characterized by doing.

  The invention according to claim 6 is the invention according to claim 4 or claim 5, wherein the control means shortens the period of intermittent transmission of the radio wave when the human body detecting means detects the human body. It is characterized by doing.

  The invention according to claim 7 is the invention according to claim 4 or claim 5, wherein the control means shortens the period of intermittent transmission of the radio wave after detecting the human body by the human body detecting means. In addition, when the water flow is detected by the water flow detection means, the on-time of the intermittent transmission of the radio wave is shortened.

  Further, the invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the control means is configured so that the cleaning water is supplied from the opening / closing valve during the period. The radio wave is transmitted from the Doppler sensor in a short predetermined period.

  According to the first aspect of the present invention, since radio waves can be transmitted intermittently from the Doppler sensor, power consumption due to driving of the Doppler sensor can be reduced. In addition, since the intermittent transmission cycle of the Doppler sensor is changed depending on detection targets such as human body detection and water flow detection, power consumption can be reduced as much as possible. Furthermore, when the toilet bowl cleaning devices are arranged adjacent to each other, in general, there is a possibility of malfunction due to radio wave interference with each other. However, since the time for driving the Doppler sensor is short, it is adjacent. There is little influence on the Doppler sensor of the toilet bowl cleaning device.

  According to the second aspect of the present invention, the reflected wave is received intermittently in synchronization with the intermittent transmission of the Doppler sensor, and reception is performed when reception of the reflected wave is unnecessary. Therefore, power consumption can be reduced by this.

  According to the invention described in claim 3, since the intermittent transmission of the Doppler sensor is changed not only in the intermittent period but also in the on-time, the power consumption can be further reduced.

  According to the invention of claim 4, since the means for extracting the frequency bands necessary for human body detection and water flow detection are provided, human body detection and water flow can be easily performed based on the difference signal of the Doppler sensor. Detection can be performed separately from detection.

  Moreover, according to the invention of Claim 5, the next detection object can be changed according to the result of a human body detection or a water flow detection.

  According to the invention described in claim 6, since the intermittent transmission period of the Doppler sensor is increased for human body detection that may be delayed in detection, power consumption can be reduced.

  Further, according to the invention described in claim 7, after detecting the water flow, the power consumption can be further reduced by shortening the ON time of intermittent transmission.

  According to the eighth aspect of the invention, since the water flow is detected only when the cleaning water is supplied, the power consumption can be further reduced.

  Next, embodiments of the invention will be described. FIG. 1 is a diagram illustrating an overall configuration of a toilet bowl cleaning apparatus according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a functional configuration of a Doppler sensor according to an embodiment of the present invention, and FIG. 3 is an intermittent operation of the Doppler sensor. FIG. 4 is a diagram showing a configuration of a cleaning control unit according to an embodiment of the present invention.

  As shown in FIG. 1, a toilet bowl cleaning device 1 according to an embodiment of the present invention includes a urinal body 2 in which an internal Doppler sensor 5 is housed, and a ball portion of the urinal body 2 connected to the urinal body 2. A water supply pipe 3 for supplying water for cleaning the internal space 2a (hereinafter referred to as "washing water"), and supply of cleaning water to the urinal body 2 disposed in the middle of the water supply pipe 3; A valve 4 which is an on-off valve for stopping the operation and a cleaning control unit 6 which controls the valve 4 to supply and stop the cleaning water and control the Doppler sensor 5 and the like are provided. Further, urine and washing water flowing in the ball space of the urinal body 2 are drained from a drainage channel 7 connected to the urinal body 2.

  The toilet cleaning device 1 configured as described above uses the Doppler sensor 5 to perform human body detection and water flow detection (including urine flow detection and wash water detection) by the cleaning control unit 6, and controls the valve 4 to perform cleaning. Operates to supply the water and wash the toilet bowl. That is, the cleaning control unit 6 performs detection control using human body detection or running water detection as a detection target, and operates according to the detection status.

  Here, the configuration of the Doppler sensor 5 will be specifically described below with reference to FIG.

  The Doppler sensor 5 includes, for example, an oscillation circuit 10 that generates a 10.525 GHz (FS) signal, a transmission circuit 11 that is a transmission unit that transmits the signal generated by the oscillation circuit 10 as a microwave that is a radio wave, The frequency difference between the receiving circuit 12 which is a receiving means for receiving the reflected wave of the microwave transmitted by the transmitting circuit 11, and the frequency FS of the microwave transmitted by the transmitting circuit 11 and the frequency Fb of the microwave received by the receiving circuit 12. And a difference detection circuit 13 which is a difference detection means for outputting a signal of ΔF (hereinafter referred to as “difference signal”).

  Therefore, when the Doppler sensor 5 is operating, a microwave is transmitted from the transmission circuit 11, the reflected wave is received by the reception circuit 12, and a difference signal is output from the difference detection circuit 13.

  Further, the Doppler sensor 5 is provided with switches 14 and 15 for controlling connections between the oscillation circuit 10 and the transmission circuit 11 and between the reception circuit 12 and the difference detection circuit 13. , 15 operate based on a drive signal from the cleaning control unit 6.

  For example, when a high level voltage is applied to the switches 14 and 15 from the cleaning control unit 6 as a drive signal, between the oscillation circuit 10 and the transmission circuit 11 and between the reception circuit 12 and the difference detection circuit 13, These switches 14 and 15 are connected to each other, a microwave is output from the transmission circuit 11, and a difference signal is output from the difference detection circuit 13.

  On the other hand, when a low level voltage is applied as a drive signal from the cleaning control unit 6 to the switches 14 and 15, between the oscillation circuit 10 and the transmission circuit 11 and between the reception circuit 12 and the difference detection circuit 13, These switches 14 and 15 are disconnected from each other, and the output of the microwave from the transmission circuit 11 and the output of the difference signal from the difference detection circuit 13 are stopped.

  As described above, the toilet bowl cleaning device 1 according to the present embodiment outputs a drive signal from the cleaning control unit 6 and operates the Doppler sensor 5 continuously or intermittently based on the drive signal. Is also possible. For example, when a drive signal for intermittent operation is input to the Doppler sensor 5, the difference detection circuit 13 receives the reflected wave intermittently in synchronization with the intermittent transmission of the microwave from the transmission means.

  Instead of providing the switches 14 and 15 in the Doppler sensor 5, as shown in FIG. 3, the switch 16 for turning on / off the power supply to the Doppler sensor 5 is operated by a drive signal, thereby making the Doppler sensor 5 May be operated continuously or intermittently.

  In the toilet cleaning device 1 of the present embodiment, the Doppler effect when using radio waves is used. However, the present invention is not limited thereto, and for example, a Doppler sensor using a sound wave such as an ultrasonic wave may be used. .

  Next, the configuration of the cleaning control unit of the toilet bowl cleaning device 1 will be specifically described.

  As shown in FIG. 4, the toilet bowl cleaning apparatus 1 according to the present embodiment is amplified by a microcomputer 21, an amplification circuit 17 that amplifies a difference signal output from the difference detection circuit 13 of the Doppler sensor 5, and an amplification circuit 17. Based on the signal from the microcomputer 21 and the high-pass filter amplifier circuit 18 (hereinafter referred to as “HPF amplifier circuit”) for reducing the low-frequency component of the differential signal and further amplifying it, the Doppler sensor 5 is intermittently operated. A sensor drive circuit 19 that outputs a drive signal for controlling the valve 4 and a valve drive circuit 20 that opens and closes the valve 4 based on a signal output from the microcomputer 21 are provided.

  Here, the microcomputer 21 incorporates a CPU (central processing unit), storage means 27 such as ROM and RAM, an input / output port, a timer, an A / D converter, and the like. By reading the program, the low-pass filter 22 (hereinafter referred to as “LPF”), the band-pass filter 23 (hereinafter referred to as “BPF”), the comparing means 24 and 25 and the control means 26 of the present invention are operated. It has a configuration. The LPF 22, the BPF 23, and the comparison means 24 and 25 may be hardware circuits. In this case, the microcomputer 21 functions as the control means 26.

  The output signal of the amplifier circuit 17 and the output signal of the HPF amplifier circuit 18 are each digitally processed by the microcomputer 21, thereby analyzing the differential signal output from the Doppler sensor 5, It is configured to perform detection control such as detection of running water. The operation of the digital signal processing in the cleaning control unit 6 will be specifically described below.

  First, the LPF 22 and the comparison unit 24 will be described, and then the BPF 23 and the comparison unit 25 will be described.

  The LPF 22 and the comparison means 24 perform signal processing so as to extract a differential signal in a frequency band of 15 to 30 Hz necessary for human body detection.

  For example, the LPF 22 is a low-pass filter having a characteristic with a cut-off frequency of 40 Hz, and the amplified differential signal output from the amplifier circuit 17 is reduced in the signal level of a frequency near 40 Hz by the LPF 22 and is supplied to the comparison means 24. Entered.

  The difference signal input in this way is compared with a predetermined threshold value in the comparison means 24, and a difference signal equal to or greater than the predetermined threshold value is output. That is, the frequency band FA of the differential signal output by the comparison unit 24 is in the range from 0 to 40 Hz, and it is possible to extract 15 to 30 Hz necessary for human body detection.

  Further, the HPF amplifier circuit 18, the BPF 23, and the comparison means 25 perform signal processing so as to extract a difference signal in the frequency band of 80 to 180 Hz necessary for detecting flowing water.

  For example, the HPF amplifier circuit 18 has a high-pass filter function and an amplification function with a cut-off frequency of 50 Hz, and the amplified differential signal output from the amplifier circuit 17 has a frequency of around 50 Hz or less by the HPF amplifier circuit 18. The signal level is reduced and input to the microcomputer 21.

  The BPF 23 is a bandpass filter having characteristics of a low-frequency cutoff frequency of 80 Hz and a wide-band cutoff frequency of 180 Hz. The amplified differential signal output from the amplifier circuit 17 is a signal having a frequency of about 80 Hz or less and 180 Hz or more by the BPF 23. The level is reduced and input to the comparison means 25.

  The difference signal input in this way is compared with a predetermined threshold in the comparison means 25, and a difference signal equal to or greater than the predetermined threshold is output. That is, the frequency band FB of the differential signal output by the comparison means 25 is in the range from 80 to 180 Hz, and it is possible to extract 80 to 180 Hz necessary for urine flow detection.

  In the toilet bowl cleaning device 1 configured as described above, as shown in FIG. 5, a human body approach detection period (T1), a urine flow detection period (T2), a human body separation detection period (T3), and a cleaning detection period (T4). ), The power consumption is reduced by making the intermittent operation of the Doppler sensor 5 different, and the operation will be specifically described below with reference to FIGS. 5 and 6.

  Here, FIG. 5 is a figure which shows the change of the intermittent operation | movement of the Doppler sensor in the toilet bowl washing | cleaning apparatus of this embodiment, FIG. 6 is a figure which shows the operation | movement flowchart of the human body detection and water flow detection in the toilet bowl washing | cleaning apparatus of this embodiment. It is.

  First, when the toilet bowl cleaning apparatus 1 is turned on, the microcomputer 21 reads the program from the internal memory, and functions as a human body detection unit, a water flow detection unit, and a control unit 26. The human body detecting means is composed of the LFP 22 and the comparing means 24, extracts a signal in the frequency band FA which is the first frequency band of the present invention from the difference signal, and detects the presence or absence of the human body. The water flow detection means is composed of BFP 23 and comparison means 25, extracts a signal in the frequency band FB, which is the second frequency band of the present invention, from the difference signal, and determines whether there is water flow in the urinal body 2 or not. Detect.

  In order to set the human body detection period (T1) shown in FIG. 5, the control means takes out a human body detection sensor drive value from a predetermined area of the storage means 27 and generates a drive signal based on this value. Based on this drive signal, the Doppler sensor 5 is intermittently operated (step S10).

  Here, the storage means 27 stores an intermittent period of 2 s and an on-time of 70 ms as the human body detection sensor drive value, and the control means 26 uses the 70 ms High signal at a 2-second period as a drive signal to drive the sensor. The signal is output to the Doppler sensor 5 via the circuit 19. And based on the drive signal, the Doppler sensor 5 amplifies a differential signal of 70 ms every 2 seconds by outputting a microwave of 70 ms in a cycle of 2 seconds and receiving a reflected wave of the transmission microwave. Output to circuit 17.

  When detecting the approach of the human body, there is no problem even with a detection delay of about 2 seconds, so the intermittent period is 2 seconds, and the approach of the human body can be detected in the frequency band of 15 to 30 Hz. The on-time of 70 ms can be acquired for one period or more.

  Subsequently, the control means 26 determines whether or not the human body has been detected from the difference signal of 70 ms on time with a cycle of 2 seconds (step S11). This determination is performed by cutting the high frequency of the differential signal output from the amplifier circuit 17 with the LPF 22 and comparing it with a predetermined threshold value by the comparison means 24. That is, by detecting a difference signal equal to or greater than a predetermined threshold by the comparison means 24, it is detected that the human body is approaching.

  Regarding the setting of the on-time, the on-time should be shortened to reduce power consumption, but there is a limit to shorten it for accurate detection. This lower limit value is a time corresponding to one cycle at the lower limit frequency when the output signal frequency range of the Doppler sensor is assumed for the detection target. For example, if a signal in the range of 10 Hz to 20 Hz is obtained for a certain detection target, one cycle is 100 ms at the longest. Therefore, if the on-time is set to 100 ms, a waveform of at least one cycle can be obtained. Become. Actually, if the on-time is increased for the purpose of discrimination from noise, etc., accurate detection / determination is possible, but this is inconsistent with the reduction in power consumption. It is desirable to set.

  When the human body is detected (step S11: Y), the control means 26 moves to the urine flow detection period (T2) shown in FIG. The drive signal is generated based on this value. Based on this drive signal, the Doppler sensor 5 is intermittently operated (step S12).

  Here, the storage means 27 stores an intermittent period of 0.5 s and an on-time of 50 ms as the urine flow detection sensor drive value, and the control means 26 drives a 50 ms High signal at a 0.5 second period. The signal is output to the Doppler sensor 5 via the sensor drive circuit 19. And based on the drive signal, the Doppler sensor 5 outputs a microwave of 50 ms with a period of 0.5 seconds, and receives a reflected wave of the transmission microwave, thereby receiving 50 ms every 0.5 seconds. The difference signal is output to the amplifier circuit 17.

  When detecting the urine flow, detection accuracy of about 0.5 seconds is necessary, so that the intermittent period is 0.5 seconds, and the urine flow can be detected in the frequency band FB of 80 to 180 Hz. The on-time of 50 ms is such that the signal of this frequency band FB can be captured for four cycles or more. Note that the ON time of four periods or more of the frequency band FB is set to distinguish noise included in the differential signal of the Doppler sensor 5 as described above.

  Subsequently, the control means 26 determines whether or not the human body separation or the urine flow can be detected from the differential signal of 50 ms with a cycle of 0.5 seconds (steps S13 and S14). This human body separation determination is performed by detecting whether the difference signal output from the amplifier circuit 17 is a difference signal equal to or greater than a predetermined threshold value via the LPF 22. The urine flow determination is performed by detecting whether the difference signal output from the amplifier circuit 17 is a difference signal equal to or greater than a predetermined threshold value via the HPF amplifier circuit 18 and the BPF 23.

  Note that two values, for example, an intermittent period of 0.5 s and an on-time of 70 ms, and an intermittent period of 0.5 s and an on-time of 50 ms are stored in the storage unit 27 as the urine flow detection sensor drive value. Also good.

  As described above, if the urinary flow detection sensor driving value is set to two, the control means first operates the Doppler sensor 5 with the on-time of 70 ms, starts detection of the urine flow by the water flow detection means, and When the urine flow is detected by the water flow detection means, the Doppler sensor 5 can be operated with the ON time of the Doppler sensor 5 set to 50 ms. In this way, by first increasing the on-time to 70 ms, it is possible to improve the accuracy of human body separation detection, and once the urine flow is detected, the human body does not separate immediately, so only the urine flow is detected. By detecting this, the ON time of the Doppler sensor 5 can be shortened.

  When the human body separation is detected (step S13: Y), the control means 26 again shifts to the human body detection period (T1) in step S10.

  On the other hand, when it is determined that the urine flow can be detected and the urine flow cannot be detected (step S14: Y), the control means 26 follows the human body separation period (T3) shown in FIG. A human body separation sensor drive value is extracted from the predetermined area, and a drive signal is generated based on this value. Based on this drive signal, the Doppler sensor 5 is intermittently operated (step S15).

  Here, the storage means 27 stores an intermittent period of 1 s and an on-time of 70 ms as the human body separation sensor drive value, and the control means 26 uses the 70 ms High signal as a drive signal for a 1-second period as a drive signal. The signal is output to the Doppler sensor 5 via the circuit 19. And based on the drive signal, the Doppler sensor 5 amplifies a differential signal of 70 ms every second by outputting a reflected wave of the transmission microwave while outputting a microwave of 70 ms in a cycle of 1 second. Output to circuit 17.

  When detecting human separation, there is no problem even with a detection delay of about 1 second, so an intermittent period of 1 second is used, and the approach of the human body can be detected in a frequency band of 15 to 30 Hz. Similarly to the above, the on-time is 70 ms.

  Subsequently, the control means 26 determines whether or not the human body separation can be detected from the difference signal of 70 ms with a cycle of 1 second in the same manner as in step S13 (step S16). This human body separation detection is performed when the difference signal cannot be detected after the comparison means 24 detects a difference signal of a predetermined value or more.

  When the human body separation is detected in this way (step S16: Y), the control means 26 starts the cleaning water detection period (T4) shown in FIG. 5 and supplies the cleaning water to the urinal body 2. A signal for opening the valve 4 for a predetermined period is output from the valve control circuit 20 (step S17).

  Further, the control means 26 takes out the washing water detection sensor drive value from the predetermined area of the storage means 27, and generates a drive signal based on this value. Then, the Doppler sensor 5 is operated based on this drive signal at the timing of opening the valve 4 in step S17 (step S18).

  The storage means 27 stores an intermittent cycle of 0 and an on-time of 50 ms as the wash water detection sensor drive value, and the control means 26 uses a single 50 ms High signal as a drive signal as a sensor drive circuit. The Doppler sensor 5 is driven via 19. Since the control means 26 knows the supply timing of the cleaning water, the control means 26 performs only the necessary minimum required time of about 50 ms, which is shorter than the time when the cleaning water is supplied.

  Subsequently, the control means 26 determines whether or not the washing water has been detected from the difference signal of 50 ms (step S19). This washing water detection is performed by detecting a difference signal of a predetermined value or more by the comparison means 24.

  In step S19, when it is determined that the washing water has been detected, the control unit 26 returns to step S10 and proceeds to the human body detection period (T1). On the other hand, when it is determined that the washing water has not been detected, Is determined to be abnormal, and the operation is terminated (step S20).

  In step S19 described above, only the supply of the cleaning water is detected, but the stop of the supply may be detected. In this case, the control unit 26 stops the valve drive circuit 20 and then reads the cleaning water stop sensor drive value from the predetermined area of the storage unit 27 and outputs a drive signal to the Doppler sensor 5 for a predetermined period. Detect stoppage of wash water supply. In this case, since the control means 26 detects the frequency band FC of about 10 to 200 Hz, it can reliably detect the stop of the wash water by outputting a drive signal of 100 ms at a predetermined timing.

  In this embodiment, the output signal of the amplifier circuit 17 and the output signal of the HPF amplifier circuit 18 are input to the A / D converter of the microcomputer 21 and filtered by the LPF 22 and the BPF 23, respectively. The output signal of the circuit 17 may be input to one A / D converter, and the LPF 22 and BPF 23 may be switched according to the situation.

The figure which shows the whole structure of the toilet bowl washing | cleaning apparatus which concerns on embodiment of this invention. The figure which shows the function structure of the Doppler sensor which concerns on embodiment of this invention. The figure which shows another structure for operating a Doppler sensor intermittently. The figure which shows the structure of the washing | cleaning control part which concerns on embodiment of this invention. The figure which shows the change of the intermittent operation | movement of the Doppler sensor in the toilet bowl washing | cleaning apparatus of this embodiment. The figure which shows the operation | movement flowchart of the human body and water flow detection in the toilet bowl washing | cleaning apparatus of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toilet bowl washing device 5 Doppler sensor 22 Low pass filter 23 Band pass filter 24,25 Comparison means

Claims (8)

In the toilet cleaning device that can supply cleaning water into the toilet body,
A Doppler sensor that generates a differential signal from the difference between the frequency of the transmitted radio wave and the frequency of the reflected wave;
Control means for performing detection control on the human body and running water in the toilet as a detection target,
The toilet cleaning device according to claim 1, wherein the control means performs detection control by intermittently transmitting radio waves from the Doppler sensor at a cycle according to the detection target.   The toilet cleaning device according to claim 1, wherein the control means causes the reflected wave to be intermittently received in synchronization with the intermittent transmission of the radio wave.   The toilet cleaning device according to claim 1 or 2, wherein the control unit causes the intermittent transmission of the radio wave to be performed in an on time corresponding to the detection target. The toilet bowl cleaning device according to claim 1,
A human body detecting means for extracting a signal of a first frequency band from the difference signal and detecting the presence or absence of a human body;
The toilet cleaning device according to any one of claims 1 to 3, further comprising: a water flow detection unit that extracts a signal in a second frequency band from the difference signal and detects the presence or absence of a water flow in the toilet.   The toilet cleaning device according to claim 4, wherein the control unit changes the detection target based on a detection result of the human body detection unit and / or the water flow detection unit.   The toilet cleaning device according to claim 4 or 5, wherein when the human body is detected by the human body detection unit, the control unit shortens the period of intermittent transmission of the radio wave.   The control unit shortens the intermittent transmission period of the radio wave after detecting the human body by the human body detection unit, and shortens the on-time of the intermittent transmission of the radio wave when the water flow is detected by the water flow detection unit. The toilet bowl cleaning apparatus according to claim 4 or 5, wherein 8. The control device according to claim 1, wherein the control unit causes the Doppler sensor to transmit a radio wave during a predetermined period shorter than the period during which cleaning water is supplied by the on-off valve. The toilet bowl cleaning device described.

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