JPH0377896B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides water supply to water washers such as toilet bowls and hand wash basins.
The present invention relates to a water supply control device that automatically controls the water supply based on the detection of the use of a water washer by a sensing unit, and particularly relates to a water supply control device whose driving power source is a battery.

<Prior art> Conventionally, as this type of water supply control device,
-126831 publication is known.

To explain the method disclosed in Japanese Unexamined Patent Publication No. 59-126831, the sensing section constantly emits infrared rays several thousand times per second from a light emitting element, and when this infrared ray hits the user of the toilet, it is reflected. It is composed of a diffuse reflection type photoelectric sensor that generates a sensing signal when a light receiving element receives the reflected light. When the light receiving element receives the reflected light, it energizes a timer installed in the control unit and starts its operation. The valve opening signal is output to the water supply unit only when light continues to be received until after the timer times up, and the valve opening signal is not output when the reflected light is no longer received before the timer times up. This prevents malfunction of the parts.

Therefore, the sensing unit is constantly emitting infrared rays, which consumes a lot of power, and the timer installed in the control unit to prevent malfunctions also needs to be energized, which further increases power consumption. I've grown up.

In other words, although the conventional device described above uses a battery as a driving power source, it consumes a large amount of power, so the battery life is short and it is necessary to replace the battery frequently, which is not only troublesome but also uneconomical. .

<Problems to be Solved by the Invention> A problem to be solved by the present invention is to reduce the power consumption of the sensing section and the control section.

<Means for Solving the Problems> Technical means taken by the present invention to solve the above problems include a water washer, a sensing part that detects the use of the water washer, and a sensing signal from this sensing part. a control unit that sends an opening/closing signal to the water supply unit based on the control unit, and a water supply unit that opens and closes the valve based on the opening/closing signal from the control unit,
In the water supply control device using a battery as a driving power source, the sensing section is configured with an infrared sensor having a light emitting element and a light receiving element, and the infrared light emitted from the light emitting element is emitted intermittently at a predetermined period. The apparatus is characterized in that it counts the number of times the reflected light is received by the light receiving element, and outputs a valve opening signal to the water supply section only when the counted number reaches a predetermined number.

<Operation> The present invention intermittently projects infrared rays from a light projecting element to create a non-light emitting state intermittently that does not consume power, and sets the count number of the number of times the reflected light received by the light receiving element to 0. If the count is counted and the reflected light disappears when the count is less than a predetermined number, the valve opening signal will not be output, and the count of the number of light reception will reach the predetermined number and the count will become 0. By outputting a valve opening signal to the water supply valve section only when the temperature has deteriorated, the water supply section is opened without using a separate timer for preventing malfunction.

<Example> An example of the present invention will be described below based on the drawings.

In this embodiment, as shown in FIG. 1, the water washer 1 is a urinal 1a, and above the urinal 1a,
To be more precise, the sensing part 2 is embedded in the wall A at a height corresponding to the height of the user's chest when the user is standing in front of the urinal 1a, and a latching solenoid is installed in the water supply part 4. This is what I used.

The sensing part 2 is a light emitting element 2 made of a light emitting diode.
It is a diffuse reflection type infrared sensor equipped with a light receiving element 2b made of a phototransistor and a light receiving element 2b, and is connected to a battery 5 as a drive power source via a control section 3, which will be described later.

The light emitting element 2a communicates with a light emitting drive circuit _3a5 of the control unit 3, which will be described later, and emits infrared light using the output from the circuit _3a5 , and this infrared light illuminates the urinal 1a for urination. The light hits the user standing in front and is diffusely reflected, and a part of this reflected light is received by the light receiving element 2b and output to the light receiving amplifier circuit _3a6 , which will be described later.

The control section 3 can be roughly divided into a human body detection control section 3a that communicates with the sensing section 2, and a human body detection control section 3a.
The human body detection control section 3a is constructed of only hardware in this embodiment.

The configuration of the human body detection control unit 3a will be explained according to FIG. 2. First, a pulse signal is continuously transmitted from the multivibrator _3a1 at a predetermined period t, for example, a period of 1 second, and this pulse signal is divided into 1/2. The signal is output to the multiplexer _3a2 and the multiplexer _3a3 .

1/2 frequency divider 3a ₂ is the above multivibrator 3
It obtains a frequency that is 1/2 of the pulse signal from _a1 , and continuously transmits a pulse signal with a period of 2t, that is, a period of 2 seconds, and this pulse signal with a period of 2t is also output to the multiplexer _3a3 .

The multiplexer _3a3 receives the selection signal given from the OR circuit _3a4 and outputs a pulse signal with a period t from the multivibrator _3a1 , or outputs a pulse signal with a period 2t from the 1/2 frequency divider _3a2 . The multiplexer 3a ₃
The selected output from the light projection drive circuit _3a5 is inputted to the light projection drive circuit _3a5 , and infrared rays are projected from the light projection element 2a based on the output from the light projection drive circuit 3a5.

That is, the period of infrared rays emitted from the light emitting element 2a is
Either t or 2t is selected by the selection signal from the OR circuit _3a4 .

On the other hand, if the light-receiving amplifier circuit _3a6 connected to the light-receiving element 2b emits infrared light from the light-emitting element 2a but the light-receiving element 2b does not receive any light, it outputs a one-shot pulse signal from the no-reflected-light one-shot circuit _3a7 . This pulse signal is sent to the flip-flop 3.
Input to clear _a8 and clear counter _3a9 .

When light is received by the light receiving element 2b, a one shot pulse signal is output from the reflected light one shot circuit _3a10 , and this pulse signal is output to set the flip-flop _3a8 and count the counter _3a9 .

Normally, when the user is not in front of the urinal 1a, the multiplexer _3a3 selects a period of 2t, and the light emitting element 2a emits light at a period of 2t, but a pulse signal is sent from the no-reflected one-shot circuit _3a7 to the flip-flop _3a8. In order to output a clear signal, the flip-flop _3a8 outputs a low signal, and this low
In addition to inputting the output to the OR circuit _3a4 , there is also no output from the flip-flop _3a13 , which will be described later, to the water supply control section 3b, so the multiplexer _3a3
The selection of period remains 2t.

Here, when the light receiving element 2b receives reflected light even once and detects the presence of a user, the reflected light is output from the one-shot circuit _3a10 to the set of flip-flops _3a8 , so that from the flip-flops _3a8 to the OR circuit _3a4. Output Hi to multiplexer 3
_a3 is switched from period 2t to period t as shown in FIG. 2, and thereafter light is emitted from the light projecting element 2a at period t.

When the counter _3a9 is not detecting a user, the pulse signal is clearly input from the one shot circuit _3a7 with no reflected light, so the count is 0, but when the user is detected, the one shot circuit with reflected light is activated. Since a pulse signal is input to the counter from 3a ₁₀ , if the count starts and this state continues, there will be reflected light.One shot circuit Every time a pulse signal is input to the counter from 3a ₁₀ , the count number will be increased and this count number will be increased. The pulse signal is output to the digital comparator _3a11 , and when the user leaves from in front of the urinal 1a, a clear pulse signal is input from the no-reflection light one-shot circuit _3a8 to return the count number to zero.

The digital comparator _3a11 receives the count input from the counter _3a9 , the detection count setting value preset by the detection count setting circuit _3a12 ,
For example, if the count number is smaller than the detection count setting value 2, the flip-flop 3
It does not output to _a13 , but it outputs Hi to flip-flop _3a13 as soon as the count becomes larger than the detection count setting value 2, and then outputs Low at the same time as the count 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 control unit 3b.

The AND circuit 3a ₁₄ connects another input terminal to the light projection drive circuit 3a ₅ , and when outputting from the circuit 3a ₅ and when the water supply control unit 3b outputs Hi, the shift register 3a ₁₅ Output to shift.

Shift register 3a ₁₅ is the light projection drive circuit 3
A plurality of Q outputs that change to Hi each time an output is output from a ₅ are provided, and the output count setting value is set depending on the number of Q outputs. In this embodiment, when the fourth Q output becomes Hi, the one shot pulse circuit 3a ₁₆ Output a pulse signal from.

This pulse signal is input to the shift register 3a ₁₅ and the flip-flop 3a ₁₃ to clear both of them, and the water supply control unit 3 is sent from the flip-flop 3a ₁₃ .
While switching the output to b from Hi to Low,
Set the output to OR circuit _3a4 to Low. Therefore, when the user uses the urinal 1a and leaves the urinal 1a, the water supply control unit 3b is released from the flip-flop 3a _13.
When a Hi output is input to the flip-flop 3a ₁₅ and a pulse signal from the one-shot pulse circuit 3a ₁₆ is output from the shift register 3a 15, the output from the flip-flop 3a ₁₃ is switched to Low. At this time, since there is no user, the output from the flip-flop _3a8 is also low, and the output from the OR circuit _3a4 disappears, and the multiplexer _3a3 is switched to a period of 2t, and from then on, light is emitted from the light emitting element 2a at a period of 2t. Let it shine.

A time chart of the human body detection control section 3a is shown in FIG.

Next, the configuration of the water supply control section 3b will be explained with reference to FIG. 4. The input, that is, the Hi output from the flip-flop _3a13 is passed through the open AND circuit _3b1 and the NOT circuit _3b2 to the closed AND circuit 3b. ₃ and is also input to the exclusive OR circuit _3b4 .

The exclusive OR circuit _3b4 has a resistor R on one input side.
By interposing a capacitor C and a capacitor C, a pulse signal is output when the output from the flip-flop _3a13 switches from Low to Hi and when it switches from Hi to Low.

Normally, when a user is not detected, the input to the exclusive OR circuit _3b4 is low, so no pulse signal is output from the circuit _3b4 , and the open drive transistor _3b9 and the close drive transistor described later 3
b ₁₉ maintains the OFF state.

Here, when the output from the flip-flop 3a ₁₃ to the water supply control unit 3b switches from Low to Hi, the open side
Hi is input to one input terminal of AND circuit 3b ₁ , and NOT circuit 3 is input to one input terminal of closed side AND circuit 3b ₃ .
A low signal is input via _b2 , and a pulse signal is output from the exclusive OR circuit _3b4 .

This pulse signal is input to the flip-flop _3b5 and outputs Hi, and is input to another flip-flop _3b6 to make the Q output Hi and the output Low, and is also input to the 50ms one-shot timer _3b7 . to start its operation and output Q.
Set to Hi.

The output of the flip-flop _3b5 and the output of the 50ms one-shot timer _3b7 are input to the AND circuit _3b8 , but since both are Hi, the circuit _3b8 is connected to the other input terminal of the open side AND circuit _3b1 and the closed side. A Hi level is output to the other input terminal of the AND circuit _3b3 .

Therefore, the open side AND circuit _3b1 has both input terminals
It becomes Hi and outputs to the open drive transistor _3b9 , turning it on.

When the opening drive transistor _3b9 turns on, the drive current I starts flowing from the battery 5, which is the drive current, to the operating coil 4a of the latching solenoid 4, which will be described later, and the drive current I passed through the coil 4a is used for opening drive. It returns to the battery 5 via the transistor _3b9 and the resistor R.

At this time, the voltage generated in the open drive transistor 3b ₉ is detected by the voltage detection circuit 3b ₁₀ , and this detected voltage is sent to the peak detection circuit 3b ₁₁ , the margin addition circuit 3b ₁₂ , the bottom detection circuit 3b ₁₃ , and the margin subtraction circuit 3b ₁₄ . Output.

Also, the Q output of the flip-flop _3b6 is Hi.
When this happens, the peak detection circuit 3b ₁₁ starts operating, but since the output is low, the bottom detection circuit 3b ₁₃ starts operating.
operation remains stopped.

On the other hand, the time versus current characteristics when the latching solenoid 4 is energized, which will be described later, are as shown in FIG.
When the operating coil 4a or the return coil 4b starts to be energized, the current increases due to the current applied to the coil, and then, after a predetermined time, the current decreases once due to the generation of a back electromotive force due to the movement of the plunger 4c. The back electromotive force becomes 0 when the valve is opened or closed in step 4d, so the current continues to rise after that, and the time required from when the current starts to flow until the current once drops and then starts to rise again is The longest estimate was found to be within about 10 milliseconds.

The peak detection circuit 3b ₁₁ detects only the high voltage, detects the current maximum value due to the current applied to the operating coil 4a, and turns the current maximum value ON for peak detection.
output to comparator _3b15 .

The peak detection ON comparator 3b ₁₅ compares the maximum current value with the output obtained from the margin addition circuit 3b ₁₂ which adds a predetermined margin to the current waveform when the latching solenoid 4 is energized.
When the output obtained from _b12 exceeds the current maximum value and becomes smaller, at that point it outputs a clear signal to flip-flop _3b6 .

When the clear signal of the flip-flop 3b ₆ is input, the Q output goes low and the peak detection circuit 3b ₁₁
At the same time, the output becomes Hi and the bottom detection circuit _3b13 starts operating.

The bottom detection circuit 3b ₁₃ tracks only low voltage, and detects the current minimum value when the valve portion 4d is open, that is, the back electromotive force is 0, and turns the current minimum value into a bottom detection ON state.
output to comparator _3b16 .

The bottom detection ON comparator 3b ₁₆ compares the minimum current value with the output obtained from the margin subtraction circuit 3b ₁₄ , which is obtained by subtracting a predetermined margin from the current waveform when the latching solenoid 4 is energized.
When the output obtained from _b14 exceeds the current minimum value, it outputs a clear signal to flip-flop _3b5 .

When the clear signal of flip-flop _3b5 is input, the output goes low and the open side AND is output from the AND circuit _3b8 .
In order to output a Low signal to the circuit _3b1 , the open driving transistor _3b9 is turned off, and the driving current I from the battery 5 to the operating coil 4a is stopped.

Note that while the open drive transistor _3b9 is in the ON state, due to some abnormality, the output obtained from the margin addition circuit _3b12 does not exceed the current maximum value or the margin subtraction circuit 3
There may be cases in which the output obtained from _b14 is not large enough to exceed the current minimum value, and in these cases, there is no input to clear the flip-flop _3b5 , so the open driving transistor _3b9 remains on, and the battery 5
The energization to the operating coil 4a is not stopped and the energization ends up being turned off.

However, even if such an abnormal condition occurs, 50 m after the input to the water supply control unit 3b becomes Hi.
After 50ms, the one-shot timer _3b7 times out, the Q output goes low, and the output from the AND circuit _3b8 switches from Hi to Low, so the opening drive transistor _3b9 turns OFF, and the operating coil 4a is transferred from the battery 5. The power is stopped and the output becomes Hi.
Therefore, the output from the NAND circuit 3b ₁₇ is set low and the inoperable lamp 3b ₁₈ is turned on to notify the user of the abnormal state.

And with the output from shift register 3a ₁₅ ,
A pulse signal is generated from the one-shot pulse circuit 3a ₁₆ , and this pulse signal changes the output from the flip-flop 3a ₁₃ to the water supply control unit 3b from Hi to Low.
When switched to , Low is input to one input terminal of the open-side AND circuit 3b ₁ , Hi is input to one input terminal of the closed-side AND circuit 3b ₃ via the NOT circuit 3b ₂ , and exclusive OR is input. A pulse signal is output from the circuit _3b4 to flip-flops _3b5 , _3b6 and a 50 msec one-shot timer _3b7 .

Therefore, both input terminals of the closed-side AND circuit _3b3 are
It becomes Hi and outputs to the closing drive transistor _3b19 , turning it on.

When the closing drive transistor _3b19 is turned on, the drive current I starts flowing from the battery 5 to the return coil 4b of the latching solenoid 4, which will be described later.

After that, the open drive transistor 3b described above ₉
Similarly, the peak detection circuit 3b ₁₁ causes the return coil 4 to
The peak detection ON comparator _3b15 compares the maximum current value obtained by applying current to b and the margin addition output obtained from the margin addition circuit _3b12 , and when the margin addition output becomes smaller than the maximum current value, At this point, the flip-flop _3b6 is cleared, and the bottom detection circuit _3b14 outputs the minimum current value obtained when the valve portion 4d is closed and the margin subtraction output obtained from the margin subtraction circuit _3b14 to the bottom detection ON comparator _3b16. When the margin subtraction output increases beyond the current minimum value, at that point the flip-flop _3b5 is cleared and the closing drive transistor _3b19 is turned off, thereby reducing the drive current from the battery 5 to the return coil 4b. I
energization is stopped.

A time chart of the water supply control section 3b is shown in FIG.

As shown in FIGS. 7 and 8, the latching solenoid 4 has a conventionally well-known structure that opens and closes the valve portion 4d by moving the plunger 4c up and down by energizing the operating coil 4a and the return coil 4b. First, the lower surface of the plunger 4c is brought into contact with and separated from the pilot hole 4f opened in the center of the diaphragm 4e, and the valve part 4d is opened and closed to open and close the diaphragm 4e.
By letting water in and out of a pressure chamber 4g formed behind the diaphragm 4e, the diaphragm 4e is moved up and down to bring the lower surface of the diaphragm 4e into contact with and away from the valve seat 4h,
The main valve 4i is opened and closed to supply flush water to the urinal 1a.

The operating coil 4a and the return coil 4b are stacked vertically in a metal case 4j, and
A metal head 4k is inserted inside both of these coils 4a and 4b, and the upper part of the head 4k is inserted into the case 4.
A plunger 4c is provided below the head 4k.

The plunger 4c is disposed within the return coil 4b so as to be movable up and down, and the plunger 4c is disposed at the bottom of the return coil 4b.
A spring 4l that always presses the plunger 4c in the valve closing direction, that is, downward, is loaded, and a permanent magnet 4m is provided on the outer periphery of the plunger 4c so as to be in contact with the lower surface of the case 4j.

To explain the operation of the latching solenoid 4, in a state where no user is normally detected, the plunger 4c is pressed downward by the spring 4l to close the pilot hole f.
At this time, the magnetic flux of the permanent magnet 4m acts in the direction of attracting the plunger 4c, so that the pilot hole 4f is kept closed by the lower surface of the plunger 4c, and the main valve 4e is kept closed.

If current is applied to the operating coil 4a in this state,
A magnetic flux is generated that tries to attract the plunger 4c upward, and this magnetic flux gradually becomes stronger. For example, within about 10 milliseconds after the operation coil 4a starts to be energized, the plunger 4c starts to move upward, and a counter electromotive force is generated. , the closed pilot hole 4f opens, the valve portion 4d opens, and the counter electromotive force becomes zero.
When the valve portion 4d opens, water in the pressure chamber 4g is discharged from the pilot hole 4f to the secondary side, 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 upward and compresses the spring 4l, until the upper surface of the plunger 4c comes into contact with the lower surface of the head 4k, and the counter electromotive force becomes zero.

At this time, the magnetic flux of the permanent magnet 4m is distributed from the outside of the magnetic flux 4m to the case 4j, the head 4k, and the plunger 4c.
A circulation path is formed to return to the inside of the permanent magnetic flux 4m, and the plunger 4c remains attracted to the head 4k, that is, maintains the open state shown in FIG. 8.

In addition, in order to change the valve from the open state to the closed state again, when the return coil 4b is energized, the permanent magnet 4m
A magnetic flux is generated in the opposite direction to the magnetic flux circulation path, and this magnetic flux gradually becomes stronger, for example, within about 10 milliseconds after the return coil 4b starts being energized, the spring 4l
Due to the elastic force, the plunger 4c begins to move downward and a counter electromotive force is generated, and the lower surface of the plunger 4c closes the pilot hole 4f, closing the valve portion 4d, and the counter electromotive force becomes zero. When the valve portion 4d opens, water on the primary side flows into the pressure chamber 4g from a small hole 4n formed on the outer circumferential side of the diaphragm 4e, and the water supply pressure causes the lower surface of the diaphragm 4e to press against the valve seat 4.
The main valve 4i closes when the vehicle is seated at the seat h, resulting in the state shown in FIG.

In this embodiment, water is supplied to the urinal 1a after the user stands in front of the urinal 1a for a predetermined period of time, and water is continued to be supplied to the urinal 1a until the user leaves and the predetermined period of time has elapsed. However, the present invention is not limited to this, and for example, when a user stands in front of the urinal 1a, water is supplied to the urinal 1a after a predetermined period of time to pre-clean the urinal 1a,
Further, water may be supplied for a predetermined period of time after the user leaves for post-cleaning.

In addition, when the human body detection control section 3a described above does not detect a user, it emits infrared rays at a cycle of 2t, for example, every 2 seconds, and when it detects a user and outputs Hi to the water supply control section 3b, i.e. When the latching solenoid 4 is opened, infrared light is emitted at a period of t, for example, 1 second, but the invention is not limited to this. When user is not detected and latching solenoid 4
The light projection period when the valve is open may be 2t, 2 seconds.

Furthermore, FIG. 9 shows another embodiment, in which a microcomputer 3a ₂₀ is used as a part of the human body detection control section 3a.

The microcomputer 3a ₂₀ is conventionally known and includes an input port 3a ₂₁ , a CPU 3a ₂₂ , a RAM 3a ₂₃ ,
Consisting of ROM3a ₂₄ , timer 3a ₂₅ , and output port 3a ₂₆ , a program to control the CPU 3a ₂₂ is written in the ROM3a ₂₄ , and the CPU 3a ₂₂ reads external data from the input port 3a ₂₁ according to this program. Alternatively, arithmetic processing is performed while exchanging data between the RAM 3a ₂₃ and the timer 3a ₂₅ , and the processed data is output to the output port 3a ₂₆ as necessary, and the output to the water supply control unit 3b is set to Hi. Or set it to Low.

The output port 3a ₂₆ starts measurement by outputting a pulse signal to the light projection drive circuit 3a ₅ connected outside the microcomputer 3a ₂₀ according to the signal given from the CPU 3a ₂₂ , and this measurement end signal is input to the input port 3a ₂₁ . Then, a pulse signal is continuously transmitted to the light projection drive circuit _3a5 again at a period of 2t or t to cause the light projection element 2a to emit infrared rays.

A light receiving element 2b based on the light emitted from this light emitting element 2a.
The reflected light presence/absence determination circuit _3a17 detects whether or not light is received by the light receiving amplifier circuit _3a6 , and this detection data is input to the input port _3a21 .

In addition, the input port 3a ₂₁ uses a signal given from the CPU 3a ₂₂ to set the detection count setting value preset by the detection count setting circuit 3a ₁₂ connected outside the microcomputer 3a ₂₀ , and the output count setting preset by the output count setting circuit 3a ₁₈ . Import each value.

The flowchart of the program written in ROM3a ₂₄ is shown in Figures 10a and 10b.
The flow of the program will be explained according to this.

When the program starts, the microcomputer first starts the timer _3a25 (step) with a light emitting period of 2t, and the detection count setting circuit 3
Input the detection count setting value, for example 2, from a ₁₂ and store it in _RAM3a23 at address DSET (step), then input the detection count value into address DCNT.
Set the contents of RAM 3a ₂₃ to 0 (step), output count setting value from output count setting circuit 3a ₁₈ ,
For example, input 4, store it in RAM3a ₂₃ at OSET address (step), and input the output count value.
The contents of RAM3a ₂₃ at address OCNT are set to 0 (step), and the output to water supply control unit 3b is turned OFF to output a low level (step), and the output state OFF is stored in RAM3a ₂₃ at address OFLAG (step). The initial state ends when the measurement start for the optical drive circuit _3a5 is turned off (step).

Next, the timer 3a ₂₅ is checked (step), and the timer 3a ₂₅ determines whether 2t has elapsed (step). When 2t has elapsed, the measurement start output is turned on and a pulse signal is sent to the light projection drive circuit 3a ₅ . Output (step).

Checks the measurement end input (step), determines whether there is an input (step), turns off the measurement start output if there is an input (step), and inputs the output from the reflected light presence/absence determination circuit _3a17 (step). ), and determine whether the reflected light is hot (step).

When the user is detected and the reflected light hits, the light emission period of timer _3a25 is changed from 2t to t (step), 1 is added to the detection count value at address DCNT (step), and the light emission period at address OFLAG is Check the output status (step) and determine whether it is outputting (step).

In this case, since the output remains OFF in the above step, the result is NO, and the detection count value at the DCNT address is checked (step), and it is determined whether it is 0 (step).

In this case, the detection count value is 1 in the above step.
, so the answer is NO, and the program steps return again to .

When the user leaves and the reflected light disappears, the NO condition is established in step 〓〓, and the process proceeds to step 〓〓.

Here, the detection count value of DCNT address and DSET
Read the address detection count setting value and compare the two.

DCNT when it is determined that the detection count value is not larger (step) than the detection count setting value 2.
Set the detection count value of the address to 0 (step 〓〓),
The program steps return again to ~, but since the detection count value becomes 0 at the above step 〓〓, the YES condition is satisfied in the step 〓〓, and the program goes to step 〓〓, where the light emitting period of timer 3a ₂₅ is set to t. to 2t, and subsequent program steps return to 2t.

On the other hand, when the detection count value is determined to be larger than the detection count setting value 2 at step 〓〓, the output to the water supply control unit 3b is changed from OFF to ON and from LOW to LOW.
Switch to Hi (step 〓〓), RAM at OFLAG address
3a ₂₃ stores the output state ON (step 〓〓), further sets the detection count value of the DCNT address to 0 (step 〓〓), and the subsequent steps of the program return to .

In this case, even if there is no reflected light, the process proceeds to steps .

In this state, since the output was turned ON in the above step 〓〓, the YES condition is met in the step 〓〓, and the process goes to step 〓〓, where 1 is added to the output count value of the OCNT address, and the output count value of the OCNT address is
Read the output count setting value of the OSET address and compare the two (step).

When it is determined that the output count value is not larger (step) than the output count set value 4, the process returns to .

If the output count value is greater than or equal to the output count setting value 4, the step will say YES.
If the conditions are met, proceed to step.

Here, turn the output to the water supply control unit 3b from ON to OFF.
to switch from Hi to Low (step),
The output state OFF is stored in RAM 3a ₂₃ at the OFLAG address (Step 〓〓), and the output count value at the OCNT address is set to 0 (Step 〓〓).Then, the process returns to the step again and checks the detection count value at the DCNT address, which is 0. The user is detected and the detection count is 0.
If it is determined that the detection count value is 0 because the user has left, the light emission period _{of timer 3a 25 is} changed to t. Change from t to 2t (step 〓〓) and then return to step again.

A time chart of the human body detection control section 3a is shown in FIG.

Incidentally, in the above embodiment, the water washer 1 is the urinal 1.
Although a case is shown, the washing machine 1 is not limited to this, and for example, as shown in FIG. 12, the water washer 1 may be a hand washing machine 1b.

In this case, a sensing unit 2 is installed on the wall A of the rear upper surface of the handwash basin 1b, and when the sensing unit 2 detects a user approaching the handwash basin 1b to wash their hands, the water supply unit 4 is energized and water is discharged. Start water supply from tool 1b ₁ ,
When the user leaves the hand wash basin 1b after washing his hands, the water supply is stopped.

That is, as shown in FIG. 15, the one-shot pulse circuit with reflected light _3a10 causes the flip-flop _3a13 to output an output from low to high, and the one-shot pulse circuit without reflected light _3a7 causes the flip-flop _3a13 to output an output from high to low. issue. From Low to Hi or from Hi from this flip-flop 3a ₁₃
At the time of output to Low, the water supply control unit 3b operates in the same manner as in the previous embodiment.

Also, when the flip-flop 3a ₁₃ outputs Hi to the water supply control unit 3b, the multiplexer 3
Switch _a3 from period 2t to period t, and when outputting Low, switch from period t to period 2t.

Furthermore, in the embodiment described above, the sensing section 2 is connected to the wall surface A.
Although the sensing section 2 is installed in an embedded manner, the mounting structure of the sensing section 2 is not limited to that shown in the drawings and may be any structure.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

By emitting infrared rays intermittently from the light emitting element, we created intermittent non-emitting states that do not consume power, making it possible to eliminate the need for conventional sensing units that constantly emit infrared rays several thousand times per second. It is possible to reduce the number of infrared rays emitted without significantly reducing the response accuracy compared to a device equipped with an infrared ray, which reduces power consumption accordingly. , if the reflected light disappears while the count number is less than a predetermined number, the count number is set to 0, and only when the count number reaches a predetermined number, a valve open signal is output to the water supply section, thereby starting the timer. Since the water supply part is opened without being used, a valve opening signal is output to the water supply part and the valve is opened only when light continues to be received until the timer for preventing malfunction installed in the conventional control part times up. In comparison, there is no need to energize the malfunction prevention timer, and power consumption can be reduced accordingly.

Therefore, the life of the battery is extended, and there is no need to frequently replace the battery, which not only provides an economical advantage of significantly reducing maintenance costs, but also greatly reduces the effort required to replace the battery.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of a water supply control device showing an embodiment of the present invention, Fig. 2 is a block diagram of the human body detection control section, Fig. 3 is a time chart of the same, and Fig. 4 is a block diagram of the water supply control section. , Figure 5 is a graph showing the time vs. current characteristics when the latching solenoid is energized, Figure 6 is a time chart of the water supply control section, and Figure 7 is a graph showing the time vs. current characteristics when the latching solenoid is energized.
The figure is an enlarged vertical sectional view of the water supply section showing the main valve in the closed state, FIG. 8 is an enlarged longitudinal sectional view of the water supply section showing the main valve in the open state, and FIGS. 9 is a block diagram of the human body detection control section, FIG. 10a and FIG. 10b are the same flowchart, FIG. 11 is the same time chart, and FIG. 12 is the water washer is a hand wash basin. A partially cutaway front view showing the case where
FIG. 13 is a block diagram of the human body detection control section. DESCRIPTION OF SYMBOLS 1...Washer, 2...Sensing unit, 2a...Light emitter, 2b...Light receiving element, 3...Control unit, 4...Water supply unit, 5...Battery.

Claims (1)

[Claims] 1 A water washer, a sensing section that detects the use of the water washer, a control section that sends an opening/closing signal to the water supply section based on a sensing signal from the sensing section, and a water supply that opens and closes a valve based on the opening/closing signal from the control section. In the water supply control device which uses a battery as a driving power source, the sensing section is configured with an infrared sensor having a light emitting element and a light receiving element, and the infrared light emission from the light emitting element is controlled to be intermittent light emission at a predetermined period. At the same time, the control section counts the number of reflected lights received by the light receiving element, and outputs a valve opening signal to the water supply section only when the counted number reaches a predetermined number.