JPH0771064A - Feed-water controller - Google Patents

Abstract

PURPOSE:To reduce maintenance, and to lower the labor hour of the exchange of batteries by a method wherein light is projected intermittently for a fixed period from the light projecting element of a sensing section, reflected light is sensed by the use of a photodetector, light is projected for a period shorter than the fixed period and light projection for the short period is continued until a valve closing signal is output to a water supply section. CONSTITUTION:When a photodetector 2b receives reflected light and the presence of a user is detected, Hi is output from a flip-flop 3a8 to an OR circuit 3a4, a multiplexer 3a3 is changed over to a period (t) from a period 2t, and subsequently light is projected for the period (t) from a light projecting element 2a. A digital comparator 3a11 compares a count input from a counter 3a9 and a detecting count set value preset by a detecting count setting circuit 3a12. When an input from the digital comparator 3a11 falls from Hi to Low, a flip-flop 3a13 outputs Hi to an AND circuit 3a14 and a feed-water control section 3b. When the user separates from a urinal 1a, the output of Hi is input from the flip-flop 3a13 to the feed-water control section 3b, and an output from the flip- flop 3a13 is changed over to Low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically supplies water to a flushing device such as a toilet bowl or a hand-washing device on the basis of the detection of the use of the flushing device by a sensing unit including an optical sensor having a light projecting element and a light receiving element. The present invention relates to a water supply control device to be controlled, and in particular, to a device whose driving power source is a battery.

[0002]

2. Description of the Related Art Conventionally, a water supply control device of this type is known from Japanese Patent Application Laid-Open No. 59-126831.
This is because the sensing unit constantly projects infrared rays several thousand times per second from the light projecting element, the infrared rays are reflected by the user of the toilet bowl, and the reflected light is received by the light receiving element. It is composed of a diffuse reflection photoelectric sensor that generates a sensing signal. Therefore, the above-mentioned conventional one is the same as the sensing part constantly emitting infrared rays continuously, so the power consumption is large even though the driving power source is a battery, the battery life is short, and the battery is frequently used. Need to be replaced,
Not only is it troublesome, but it is also uneconomical.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object thereof is to reduce the power consumption of the sensing unit.

[0004]

In order to achieve the above object, the water supply control device of the present invention comprises a water washing device and an optical sensor having a light projecting element and a light receiving element to sense and detect the use of the water washing device. A sensing unit that outputs a signal, a control unit that outputs an opening / closing signal to the water supply unit based on the sensing signal from the sensing unit, and a water supply unit that opens / closes the valve by the opening / closing signal input from the control unit, In a water supply control device using a battery as a driving power source, the light projecting element of the sensing unit intermittently projects light at a predetermined cycle, and the light receiving element senses reflected light and then projects light at a cycle shorter than the predetermined cycle. The light emission is continued in the short cycle until the valve closing signal is output to the water supply unit.

[0005]

The present invention, when the sensing unit does not sense the human body,
When the infrared ray is intermittently projected from the light projecting element and the sensing unit is sensing the human body, the cycle of intermittent intermittent light projection is further shortened to reduce the number of infrared rays projected without significantly lowering the response accuracy. is there.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This embodiment shows a case where the flushing device 1 is a urinal 1a as shown in FIG. 1, and the user's chest is placed above the urinal 1a, to be precise, in a state in which the user stands in front of the urinal 1a. The sensing unit 2 is embedded in the wall surface A having a height corresponding to the hit, and the latching solenoid is used in the water supply unit 4.

The sensing section 2 is a diffuse reflection type infrared sensor having a light emitting element 2a made of a light emitting diode and a light receiving element 2b made of a phototransistor, and is connected to a battery 5 of a driving power source via a control section 3 described later. contact.

The light projecting element 2a is a light projecting device of the control unit 3 described later.
Live circuit 3a_FiveContact the circuit 3a _FiveOutput from
Urinal 1a for projecting infrared light and using this infrared light for convenience
The user standing in front of the diffused reflection of this reflected light
By receiving a part of the light with the light receiving element 2b,
Amplifier circuit 3a₆Output to.

The control section 3 is roughly divided into a human body detection control section 3a which communicates with the sensing section 2 and a water supply control section 3b which operates the latching solenoid 4 by the output from the human body detection control section 3a. In the example above, the human body detection control unit 3a
Shows the case where is configured only by hardware.

The structure of the human body detection controller 3a will be described with reference to FIG. 2. First, a pulse signal is continuously transmitted from the multivibrator 3a _{1 at a} predetermined cycle t, for example, a cycle of 1 second,
This pulse signal is a 1/2 frequency divider 3a ₂ and a multiplexer 3a.
Output to ₃ .

The ½ frequency divider 3a ₂ obtains ½ the frequency of the pulse signal from the multivibrator 3a _1, and continuously oscillates the pulse signal at a period of 2t, that is, a period of 2 seconds. The pulse signal of the cycle 2t is also used by the multiplexer 3a ₃
Is output to.

The multiplexer 3a ₃ receives the selection signal given from the OR circuit 3a _{4 and} receives the selection signal from the multivibrator 3a.
Output pulse signal with cycle t from ₁ or 1/2
From the frequency divider 3a ₂ performs one of selection outputs a pulse signal having a period 2t, selecting an output from the multiplexer 3a ₃ is inputted to the drive circuit 3a ₅ floodlight, from the light projecting drive circuit 3a ₅ Infrared rays are emitted from the light projecting element 2a based on the output. That is, the projection cycle of infrared rays from the light projecting element 2a is selected to t or 2t by the selection signal from the OR circuit 3a ₄ .

On the other hand, the light-receiving amplifier circuit 3a _{6 connected} to the light-receiving element 2b receives the infrared light from the light-emitting element 2a.
One-shot circuit with no reflected light when no light is received by 2b 3a ₇
A more one-shot pulse signal is output, and this pulse signal clears flip-flop 3a ₈ and counter 3a ₉
Input to clear. Further, if there is a light receiving element 2b, and outputs a one-shot pulse signal from the one-shot circuit 3a ₁₀ has the reflected light, the pulse signal is output to the count of the set and the counter 3a ₉ of flip-flop 3a _8.

[0014] Normally, when the user is not in front of the urinal 1a, first multiplexer 3a ₃ but is projected light with a period 2t from projecting element 2a select period 2t, reflected light without the one-shot circuit 3a ₇ for outputting a pulse signal to clear flip-flop 3a _8, outputs Low from the flip-flop 3a _8, causes input the Low output to the OR circuit 3a _4, flip flop 3a ₁₃ further described below
Since there is no output from the water supply controller 3b from the multiplexer,
The selection of 3a ₃ remains the period 2t.

[0015] Here, to detect the presence of a user by receiving the reflected light at the light receiving element 2b once, for output from the one-shot circuit 3a ₁₀ located reflected light to the set of flip-flops 3a _8, the flip-flop 3a ₈ to OR circuit 3a ₄ H
i is output to switch the multiplexer 3a ₃ from the period 2t to the period t as shown in FIG. 2, and thereafter, the light projecting element 2a emits light at the period t.

The counter 3a ₉ has a count value of 0 because the pulse signal is clearly input from the one-shot circuit 3a ₇ without reflected light when the user is not detected. One-shot circuit with reflected light
Since the pulse signal is input to the count from 3a _10, if this state continues and there is reflected light, the count number is incremented each time a pulse signal is input from the one-shot circuit 3a ₁₀ to the count. Is output to the digital comparator 3a _11, and if the user then walks away from the urinal 1a, the one-shot circuit 3a without reflected light
_The pulse signal is input to clear from ₈ and the count number becomes 0.
Return to.

The digital comparator 3a ₁₁ has a count number input from the counter 3a ₉ and a detection count setting value preset by the detection count setting circuit 3a ₁₂ , for example, 2
When the count number is smaller than the detection count set value 2 and is not output to the flip-flop 3a ₁₃ , the count number is larger than the detection count set value 2 and at the same time Hi is output to the flip-flop 3a ₁₃ and then Low is output at the same time as the count number becomes 0.

When the input from the digital comparator 3a ₁₁ falls from Hi to Low, the flip-flop 3a ₁₃ outputs Hi to the AND circuit 3a ₁₄ and the water supply controller 3b.
When AND circuit 3a ₁₄ is to contact the input terminal of the other one to the drive circuit 3a ₅ for the light projection, and outputs and Hi feedwater control unit 3b when the output from the circuit 3a _5, the shift register 3a
Output to ₁₅ shifts.

The shift register 3a ₁₅ is a drive circuit for projecting light.
Each time 3a ₅ is output, multiple Q outputs that replace Hi are provided, and the output count set value is set according to the number of Q outputs.
In this embodiment, when the fourth Q output becomes Hi, the one-shot pulse circuit 3a ₁₆ outputs a pulse signal.

This pulse signal is applied to the shift register 3a.₁₅as well as
Flip flip 3a₁₃Clear both of them by typing in
And flip-flop 3a₁₃Output to the water supply control unit 3b from
Switching from Hi to Low and the OR circuit 3a_FourTo
Set the output to Low. Therefore, the user uses the urinal 1a
And then away from urinal 1a, flip-flop 3a₁₃From
When the output of Hi is input to the water control unit 3b,
Dista 3a₁₅Output from the one-shot pulse circuit 3a
₁₆When the pulse signal of is output, the flip-flop 3a₁₃Out of
The force switches to Low. At this time there are no users so pretend
Flip-flop 3a ₈The output from is also low, and the OR circuit
3a_FourNo output from multiplexer 3a₃The cycle
After switching to 2t, after that, the light is emitted from the light emitting element 2a at a cycle of 2t.
Light up. The time chart of the human body detection control unit 3a
3 shows.

Next, will be described in accordance with FIG. 4 the construction of the water supply control unit 3b, an input, i.e., H from the flip-flop 3a ₁₃
with i output is inputted via the open side AND circuit 3b ₁ and a NOT circuit 3b ₂ to the closed side AND circuit 3b _3, is also input to the exclusive OR circuit 3b _4.

The exclusive OR circuit 3b ₄ is pulsed when the output from the flip-flop 3a ₁₃ is switched from Low to Hi and when it is switched from Hi to Low by interposing a resistor R and a capacitor C on one input side. Output a signal.

Normally, when the user is not detected, the
Alternative OR circuit 3b_FourInput to the circuit is low
3b_FourNo pulse signal is output from the
Randista 3b₉And closing drive transistor 3b₁₉Is OFF
Holds the state of. Flip flop 3a here₁₃Or
The output to the water supply control unit 3b from Low to Hi,
Open side AND circuit 3b₁Hi is input to one input terminal and closed
Side AND circuit 3b ₃NOT circuit 3b on one input terminal₂To
After that, Low is input and the exclusive OR circuit 3b_Four
Outputs a pulse signal.

This pulse signal is input to the flip-flop 3b ₅ to output Hi, and is also input to the other flip-flop 3b ₆ to output Q output at Hi and Q'output at L.
becomes ow, starts its operation are further inputted to 50m sec one shot timer 3b _7, the Q output to Hi.

Output of the above flip-flop 3b ₅ and 50 m
The output of the second one-shot timer 3b ₇ is input to the AND circuit 3b ₈ , but since both are Hi, the circuit 3b ₈ is open side A
Hi is output to the other input terminal of the ND circuit 3b _{1 and} the other input terminal of the close side AND circuit 3b ₃ , respectively. Therefore, both the input terminals of the open side AND circuit 3b ₁ become Hi and output to the open drive transistor 3b ₉ to be turned on.

When the open drive transistor 3b ₉ is turned on, the drive current I is started to be supplied from the battery 5 which is the drive current to the operating coil 4a of the latching solenoid 4 which will be described later.
Drive current is energized to the coil 4a I returns again to the battery 5 through the transistor 3b ₉ and a resistor R for driving opening. At this time, the voltage generated in the open drive transistor 3b ₉ is detected by the voltage detection circuit 3b ₁₀ , and this detection voltage is detected by the peak detection circuit 3b ₁₁
And is output to the margin adding circuit 3b ₁₂ and the bottom detecting circuit 3b ₁₃ and margin subtracting circuit 3b _14. When the Q output of the flip-flop 3b ₆ becomes Hi, the peak detection circuit 3b ₁₁
While starting the actuation, Q 'operation output is Low because the bottom detection circuit 3b ₁₃ remains stopped state.

On the other hand, the time-current characteristics when the latching solenoid 4 is energized, which will be described later, as shown in FIG. 5, when energization of the operating coil 4a or the return coil 4b starts, the current rises due to the application of current to the coil. Then, after a predetermined period of time, the current once decreases due to the generation of the counter electromotive force accompanying the movement of the plunger 4c, but since the counter electromotive force becomes 0 by opening or closing the valve portion 4d, the current continues to increase thereafter. It was found that the time required from the start of energization to the time when the current once drops and the current starts to rise again is about 10 msec at the longest estimate.

The peak detection circuit 3b ₁₁ follows only a high voltage, detects the maximum current value due to the current application to the operating coil 4a, and outputs the maximum current value to the peak detection ON comparator 3b ₁₅ . Peak detection ON comparator 3b
₁₅ and the current maximum value, compares the output obtained from the margin adding circuit 3b ₁₂ obtained by adding a predetermined margin to the current waveform when the latching solenoid 4 energized, the output obtained from the circuit 3b ₁₂ is a current maximum value When it becomes smaller than that, it is output to the clear of the flip-flop 3b ₆ at that time.

When the clear of the flip-flop 3b ₆ is inputted, the Q output becomes Low and the operation of the peak detection circuit 3b ₁₁ is stopped, and the Q'output becomes Hi and the operation of the bottom detection circuit 3b ₁₃ is started. Start.

Bottom detection circuit 3b₁₃Chase only low voltage
When the valve portion 4d is opened, that is, the minimum value of the counter electromotive force is 0.
Is detected and the minimum current value is detected by the bottom detection ON comparator.
3b ₁₆Output to. Bottom detection ON comparator 3b₁₆
Is the minimum current value and the voltage when the latching solenoid 4 is energized.
Margin subtraction circuit that subtracts a specified margin from the flow waveform
3b₁₄Output from the circuit 3b₁₄Got from
When the output exceeds the minimum current value and becomes large,
With flip-flop 3b_FiveOutput to clear. Flip
Flop 3b_FiveWhen the clear of is input, the output becomes Low.
AND circuit 3b₈From open side AND circuit 3b₁To Low
Open drive transistor 3b for output ₉Is in the OFF state
And the drive current I is passed from the battery 5 to the operating coil 4a.
Stop.

The open drive transistor 3b ₉ is turned on.
Margin addition circuit due to some abnormality in
It is conceivable that the output obtained from 3b ₁₂ does not become smaller than the maximum current value, or the output obtained from the margin subtraction circuit 3b ₁₄ does not become larger than the minimum current value.In these cases, the flip-flop 3b _Since there is no input for clearing ₅ , the open drive transistor 3b ₉ remains ON, and the energization from the battery 5 to the operating coil 4a is not stopped but is energized and left. However, even if such an abnormal state occurs, 50 ms after the input to the water supply control unit 3b becomes Hi, the 50 ms one-shot timer 3b ₇ times up and the Q output becomes Low, and the AND circuit 3b
_Since the output from ₈ is switched from Hi to Low, the open drive transistor 3b ₉ is turned off and the energization from the battery 5 to the operating coil 4a is stopped, and further the Q'output becomes Hi, so the NAND circuit 3b ₁₇ inform the abnormal state to the user by lighting the in the Low inoperative lamp 3b ₁₈ the output from.

Then, a pulse signal is generated from the one-shot pulse circuit 3a ₁₆ at the output from the shift register 3a ₁₅ ,
When the output from the flip-flop 3a ₁₃ to the water supply controller 3b is switched from Hi to Low by this pulse signal, the open side A
Low is input to one input terminal of the ND circuit 3b ₁ and closed side A
Hi is input to one input terminal of the ND circuit 3b ₃ via the NOT circuit 3b ₂ , and the exclusive OR circuit 3b ₄ outputs a pulse signal to the flip-flops 3b ₅ , 3b ₆ and the 50 ms one-shot timer 3b ₇ . Is output. Therefore the closed side AN
Both of the input terminals of the D circuit 3b ₃ become Hi, and the D circuit 3b ₃ outputs it to the close driving transistor 3b ₁₉ to turn it on.

Close drive transistor 3b₁₉Turns on
And return of the latching solenoid 4 which will be described later from the battery 5.
Energization of the drive current I to the coil 4b is started. After that
The open drive transistor 3b described above₉Similar to peak detection
Circuit 3b₁₁The voltage obtained by applying a current to the return coil 4b is
Maximum value and margin addition circuit 3b ₁₂Merge obtained from
Peak detection ON comparator 3b₁₅Ratio
In comparison, the margin addition output exceeds the maximum current value and becomes smaller.
Then at that point flip-flop 3b₆Clear, and
Bottom detection circuit 3b₁₄The current pole obtained when the valve 4d is closed
Small value and margin subtraction circuit 3b₁₄Margin reduction from
Computation force and bottom detection ON comparator 3b₁₆Compare with
However, the margin subtraction output exceeds the minimum current value and increases.
And then flip-flop 3b_FiveClear and close drive
Transistor 3b₁₉By turning off the
Stop energizing the drive current I from the pond 5 to the return coil 4b
It FIG. 6 shows a time chart of the water supply controller 3b.

The latching solenoid 4 is shown in FIGS.
As shown in Fig. 5, the plunger 4c is moved up and down by energizing the operating coil 4a and the return coil 4b to open and close the valve portion 4d. The diaphragm 4e is moved up and down by moving the diaphragm 4e up and down by opening and closing the pilot hole 4f opened and closed and opening and closing the valve portion 4d to move water into and out of the pressure chamber 4g formed behind the diaphragm 4e.
The lower surface of the urinal 1a by moving it toward and away from the valve seat 4h and opening and closing the main valve 4i.
This is to supply the wash water to.

The operation coil 4a and the return coil 4b are vertically stacked in a metal case 4j, and a metal head 4k is inserted inside the coils 4a and 4b so that the upper part of the head 4k is inserted. Fix it to the case 4h and
Plunger 4c is provided below 4k. The plunger 4c is provided in the return coil 4b so as to be movable up and down, and a spring 4l for constantly pressing the plunger 4c in the valve closing direction, that is, downward is mounted on the lower portion of the plunger 4c. Is placed in contact with the bottom surface of case 4j.

The operation of the latching solenoid 4 will be described. Normally, when the user is not detected, the spring 4l elastically presses the plunger 4c downward to close the pilot hole 4f. Magnet 4m
Magnetic flux acts in a direction to attract the plunger 4c, the pilot hole 4f is kept closed by the lower surface of the plunger 4c, and the main valve 4e is kept closed.

In this state, when the operating coil 4a is energized, a magnetic flux for attracting the plunger 4c upward is generated, and this magnetic flux gradually becomes stronger. For example, the operating coil 4a
The plunger 4c starts to move up within about 10 msec after the start of energization to generate the counter electromotive force, and the blocked pilot hole 4f opens and the valve portion 4d opens, and the counter electromotive force becomes 0. Become. When the valve portion 4d opens, the water in the pressure chamber 4g is discharged to the secondary side from the pilot hole 4f, and the main valve 4i opens when the lower surface of the diaphragm 4e separates from the valve seat 4h.

Thereafter, the plunger 4c continues to move further upward, compresses the spring 4l, and finally the upper surface of the plunger 4c contacts the lower surface of the head 4k, and the counter electromotive force becomes zero. The magnetic flux of the permanent magnet 4m at this time is from the outside of the magnet 4m to the case 4j and the head.
A circulation path that returns to the inside of the permanent magnet 4m via 4k and the plunger 4c is formed, and the plunger 4c remains attracted by the head 4k, that is, the valve open state shown in FIG. 8 is maintained.

In order to close the valve from the open state to the closed state again, when the return coil 4b is energized, a magnetic flux in the direction opposite to the circulation path of the magnetic flux of the permanent magnet 4m is generated, and this magnetic flux is gradually strengthened. For example, within about 10 ms after the energization of the return coil 4b starts, the elastic force of the spring 4l causes the plunger 4c to start moving downward to generate a counter electromotive force, and the lower surface of the plunger 4c closes the pilot hole 4f. The valve portion 4d is closed and the back electromotive force becomes zero. When the valve portion 4d opens, water on the primary side flows into the pressure chamber 4g through the small hole 4n opened on the outer peripheral side of the diaphragm 4e, and the lower surface of the diaphragm 4e is seated on the valve seat 4h by the water supply pressure. The main valve 4i is closed and the state shown in FIG. 7 is obtained.

In this embodiment, the user stands in front of the urinal 1a to supply water to the urinal 1a after a lapse of a predetermined time, and the water is continuously supplied until the user leaves the urinal 1a for a predetermined time. The toilet bowl 1a has been washed, but the invention is not limited to this.
When the user stands before 1a, water may be supplied to the urinal 1a after a predetermined time for pre-washing, and after the user has left, water may be supplied for a predetermined time for post-washing.

Further, the human body detection control section 3a described above emits infrared rays at a cycle of 2t, for example, every 2 seconds when the user is not detected, and when the user is detected and outputs Hi to the water supply control section 3b. At the time, that is, when the latching solenoid 4 is opened, infrared rays are projected at a cycle t, for example, a 1 second cycle.
However, the present invention is not limited to this.
The light projection cycle may be set to 1 second, and the light projection cycle may be set to 2t, 2 seconds when the user is not detected and when the latching solenoid 4 is opened.

Further, FIG. 9 shows another embodiment, which is constructed by using a microcomputer 3a ₂₀ as a part of the human body detection control section 3a. The microcomputer 3a ₂₀ is well known in the art, and the input port 3a
₂₁ , CPU3a ₂₂ , RAM3a ₂₃ , ROM3a ₂₄ , timer 3a
₂₅ and output port 3a ₂₆ , ROM3a ₂₄ has C
A program to control PU3a ₂₂ is written, and C
According to this program, the PU3a ₂₂ fetches external data from the input port 3a ₂₁ or exchanges data with the RAM 3a ₂₄ and the timer 3a ₂₅ to perform arithmetic processing and output the processed data as necessary. The output to the port 3a ₂₆ and the output to the water supply control unit 3b are set to Hi or Low.

The output port 3a ₂₆ outputs a pulse signal to the light emission drive circuit 3a ₅ connected to the outside of the microcomputer 3a ₂₀ by a signal given from the CPU 3a ₂₂ to start the measurement, and this measurement end signal is input to the input port 3a. _When input to ₂₁ , the drive circuit 3a ₅ for projecting light again has a cycle of 2t or t.
The pulse signal is continuously emitted by the to project infrared rays from the light projecting element 2a. Light receiving element based on the light emitted from the light emitting element 2a
Whether reception of the 2b detects reflected light availability determination circuit 3a ₁₇ through the light receiving amplifier circuit 3a _6, Tokomu the detection data to the input port 3a _21. In addition, the input port 3a ₂₁ is a CPU
Microcomputer 3a by the signal given from 3a _{22
20 The} detection count set value preset by the detection count setting circuit 3a ₁₂ connected outside is output to the output count setting circuit 3a ₁₈
The preset output count set values are fetched respectively.

The programs written in the ROM 3a ₂₄ are shown in the flow charts of FIGS. 10 and 11, and the flow of the programs will be described in accordance with the flow charts. When the program starts, the mylok computer first starts the timer 3a ₂₅ at the light emission period 2t (step 1), inputs the detection count setting value, for example 2, from the detection count setting circuit 3a ₁₂ and enters the RAM 3a ₂₃ at the DSET address. Store (step 2) and put detection count value in DCNT
The contents of the RAM 3a ₂₃ at the address are set to 0 (step 3), the output count setting value, for example, 4 is input from the output count setting circuit 3a ₁₈ and stored in the RAM 3a ₂₃ at the address OSET (step 4), and the output count value is inserted. RA at OCNT
The content of M3a ₂₃ is set to 0 (step 5), and the water supply controller
The output to 3b is turned OFF and Low is output (step 6), the output state OFF is stored in the RAM 3a ₂₃ at the OFLAG address (step 7), and the measurement start to the light emission drive circuit 3a ₅ is turned off (step 8). ) The initial state ends.

Next, the timer 3a ₂₅ is checked (step 9), and it is judged whether or not the timer 3a ₂₅ has passed 2t (step 10). When 2t has passed, the measurement start output is turned on and the light emission drive circuit 3a. _A pulse signal is output to ₅ (step 11). Check the measurement end input (step 12) and judge whether there is input (step 1)
3) When there is an input, the measurement start output is turned off (step 14), the output from the reflected light presence / absence determining circuit 3a ₁₇ is input (step 15), and it is determined whether there is reflected light (step 16).

When the user is detected and there is reflected light, the projection period of the timer 3a ₂₅ is changed from 2t to t (step 17), and 1 is added to the detected count value of the DCNT address (step 18). ), The output state of the OFLAG address is checked (step 19), and it is determined whether or not it is being output (step 20). In this case, the output is turned off in step 6 above.
Since it remains as it is, the result is NO, the detection count value at the DCNT address is checked (step 21), and it is determined whether it is 0 (step 22). In this case, since the detection count value is 1 in step 18 above, the determination is NO, the program step returns to 9, and steps 9 to 22 are repeated, and the detection count value is incremented by 1 each time step 18 is passed. . When the user leaves and the reflected light disappears, the condition of NO is satisfied in step 16, and the process proceeds to step 23.

Here, the detection count value of the DCNT address and D
The detection count setting value of the SET address is read and both are compared. When it is determined that the detected count value is not larger than the detected count set value 2 (step 24), the detected count value at the DCNT address is set to 0 (step 25), the program step returns to 19, and steps 19 to 25 are repeated. Proceed to
Since the detection count value becomes 0 in step 25, the condition of YES is satisfied in step 22, and the process proceeds to step 26,
The projection period of the timer 3a ₂₅ is changed from t to 2t, and the subsequent program step returns to 9. On the other hand, when it is determined in step 24 that the detection count value is larger than the detection count setting value 2, the output to the water supply control unit 3b is switched from OFF to ON and is switched from Low to Hi (step 27),
The output state ON is stored in the RAM 3a ₂₃ of the OFLAG address (step 28), the detection count value of the DCNT address is set to 0 (step 29), and the subsequent program step returns to 9. In this case, the process proceeds to steps 9 to 16, but even if there is no reflected light here, step 23-24-
Go through 25 steps, even if there is reflected light
Proceed through steps 17-18, and eventually proceed to step 19-20.

In this state, the output is turned on in step 27 above.
Therefore, the condition of YES is satisfied in step 20, the process proceeds to step 30, and 1 is added to the output count value of the OCNT address, the output count value of the OCNT address and the output count set value of the OSET address are read, and both are compared. (Step 31). When it is judged that the output count value is not larger than the output count set value 4 (step 32), the process returns to 9 again,
Each time step 31 is repeated by repeating steps 9 to 31, the output count value is incremented by one. If the output count value becomes greater than or equal to the output count set value 4 among them, the condition of YES is satisfied in step 32, and the process proceeds to step 33.

Here, the output to the water supply controller 3b is changed from ON to O.
Set to FF and switch from Hi to Low (step 33), O
The output state OFF is stored in the RAM 3a ₂₃ of the FLAG address (step 34), and the output count value of the OCNT address is set to 0 (step 35). Then, the process returns to step 21 and D
The detection count value of the CNT address is checked and it is judged whether it is 0 or not (step 22). However, when it is judged that the user is detected and the detection count is not 0, the projection cycle of the timer 3a ₂₅ is set. When the user walks away and determines that the detection count value is 0 at t, the projection cycle of the timer 3a ₂₅ is changed from t to 2t.
(Step 26) and then returns to step 9.
FIG. 12 shows a time chart of the human body detection control unit 3a.

In the above-described embodiment, the case where the flushing device 1 is the urinal 1a is shown, but the flushing device 1 is not limited to this. For example, as shown in FIG. 13, the flushing device 1 is the hand washing device 1b. May be. In this case, the sensing unit 2 is provided on the wall surface A on the rear upper surface of the hand washing device 1b. When the sensing unit 2 detects a user approaching the hand washing device 1b for hand washing, the water supply unit 4 is energized to discharge water. start the water supply from the tool 1b _1, and is adapted to stop the water supply and the user leaves from the hand washing after wash unit 1b. That is, as shown in FIG. 14, the one-shot pulse circuit 3a ₁₀ with reflected light causes the flip-flop 3a ₁₃ to shift from Low to Hi.
One shot pulse circuit 3a ₇
As a result, the flip-flop 3a ₁₃ outputs a Low output from Hi. Low to Hi from this clip-flop 3a ₁₃
The water supply control unit 3b operates in the same manner as in the previous embodiment at the time of the output to or from Hi to Low. Further, when Hi is output from the flip-flop 3a ₁₃ to the water supply control unit 3b, the multiplexer 3a ₃ is switched from the cycle 2t to the cycle t, and when outputting Low, the cycle t is switched to the cycle 2t.

Further, although the sensing unit 2 is embedded in the wall surface A in the above-described embodiment, the mounting structure of the sensing unit 2 is not limited to that shown in the drawing, and is arbitrary.

[0052]

The present invention has the following advantages because of the above configuration. When the sensing unit is not sensing the human body, infrared rays are intermittently projected from the light projecting element, and when the sensing unit is sensing the human body, the intermittent light projecting cycle is further shortened. Compared to a sensor equipped with a sensor that projects infrared rays several thousand times per second, the number of times infrared rays are projected can be reduced without significantly lowering the response accuracy, and power consumption can be reduced accordingly. You can Therefore, the life of the battery is extended and it is not necessary to frequently replace the battery. Therefore, not only the economical advantage of greatly reducing the maintenance cost but also the labor of replacing the battery is significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a water supply control device showing an embodiment of the present invention.

FIG. 2 is a block diagram of a human body detection control unit.

FIG. 3 is the same time chart.

FIG. 4 is a block diagram of a water supply control unit.

FIG. 5 is a graph showing time-current characteristics when a latching solenoid is energized.

FIG. 6 is a time chart of a water supply control unit.

FIG. 7 is an enlarged vertical sectional view of a water supply section showing a closed state of a main valve.

FIG. 8 is an enlarged vertical cross-sectional view of a water supply section showing an opened state of a main valve.

FIG. 9 is a block diagram of a human body detection control unit showing another embodiment of the present invention.

FIG. 10 is the same flowchart.

FIG. 11 is a continuation of FIG. 10 in the same flowchart.

FIG. 12 is the same time chart.

FIG. 13 is a partially cutaway front view showing a case where the water washing device is a hand washing device.

FIG. 14 is a block diagram of a human body detection control unit.

[Explanation of symbols]

 1 Water washer 2 Sensing part 2a Light emitting element 2b Light receiving element 3 Control part 4 Water supply part 5 Battery

Claims (1)

[Claims] 1. A water washing unit, a sensing unit comprising an optical sensor having a light projecting element and a light receiving element, for sensing the use of the water washing unit and outputting a sensing signal, and a water supply unit based on the sensing signal from the sensing unit. In a water supply control device that includes a control unit that outputs an opening / closing signal to and a water supply unit that opens / closes a valve by inputting an opening / closing signal from the control unit, a predetermined amount is provided from a light emitting element of the sensing unit in a water supply control device that uses a battery as a driving power source. We perform intermittent light emission in a cycle,
After sensing the reflected light by the light receiving element, the light is projected in a cycle shorter than the predetermined cycle, and the light projection is continued in the short cycle until a valve closing signal is output to the water supply section. Control device.