JP6282460B2 - Water supply control device - Google Patents

Description

  The present invention relates to a water supply control device used for an automatic faucet or the like.

  Automatic faucets are widely used in kitchens and washstands. In this automatic faucet, a water supply control device is usually used that includes an electromagnetic valve installed in a water supply channel connected to a water outlet and a control unit that outputs a control signal to the electromagnetic valve and controls the opening and closing of the electromagnetic valve. Under the control of the control unit, the solenoid valve opens and closes the water supply channel, and water supply to the water outlet and water stoppage are switched.

  In this automatic water faucet, the electromagnetic valve may not open or close even if a valve opening signal or a valve closing signal is output from the control unit due to a foreign matter biting into the electromagnetic valve. In order to suppress the occurrence of the opening / closing failure of the electromagnetic valve, in the technology of Patent Document 1, a generator is installed in the water supply channel. After outputting a valve opening signal or valve closing signal to the solenoid valve, it detects the presence or absence of power generation by the generator, and if it detects that the solenoid valve is not opened or closed, it re-outputs the valve opening signal or valve closing signal The solenoid valve is controlled to open and close.

No. 06-16177

  As a result of investigation by the present inventor, it has been found that there is a case where it is not possible to suppress the occurrence of the opening / closing operation failure of the electromagnetic valve only by re-outputting the valve opening signal or the valve closing signal as in the technique of Patent Document 1. It was.

  This invention is made in view of such a subject, and the objective is to provide the technique which can suppress effectively generation | occurrence | production of the opening / closing operation | movement malfunction of a solenoid valve.

  In order to solve the above-described problem, an aspect of the present invention relates to a water supply control device. The water supply control device outputs a control signal to an electromagnetic valve installed in the water supply channel, a generator that generates power by the water flow in the water supply channel, a power generation detection unit that detects whether power is generated by the generator, A controller that controls the opening and closing of the solenoid valve, and the controller, when the power generation by the generator is detected within a predetermined time after the output of the first valve closing signal for closing the solenoid valve, A second valve closing signal having a longer output time than the first valve closing signal is output.

  According to this aspect, by outputting the second valve closing signal having a longer output time than the first valve closing signal to the electromagnetic valve, the first valve closing signal is output to the moving body that opens and closes the valve portion of the electromagnetic valve. A force is applied to move to the valve closing position for a longer time than when outputting. The output of the first valve closing signal stops before the moving body completely stops at the valve closing position when the first valve closing signal is output, the moving body continues to move due to inertia, and the moving body bounces from the valve closing position. Consider the case of returning to the valve open position. Even in this case, at the time of outputting the second valve closing signal, it becomes easy to push back the bounced moving body to the valve closing position, and the occurrence of operation failure at the time of valve closing can be effectively suppressed.

  Further, a water supply control device according to another aspect of the present invention includes an electromagnetic valve installed in a water supply channel, a generator that generates electricity by a water flow in the water supply channel, and a power generation detection unit that detects whether or not power is generated by the generator. A control unit that outputs a control signal to the electromagnetic valve and controls the opening and closing of the electromagnetic valve, and the control unit outputs the first valve opening signal for opening the electromagnetic valve within a predetermined time. When power generation by the generator is not detected, a second valve opening signal having a longer output time than the first valve opening signal is output.

  According to this aspect, the first valve opening signal is output to the moving body that opens and closes the valve portion of the electromagnetic valve by outputting the second valve opening signal having a longer output time than the first valve opening signal to the electromagnetic valve. A force is applied to move to the valve open position for a longer time than at the time of output. The output of the first valve opening signal stops before the moving body completely stops at the valve open position when the first valve opening signal is output, the moving body continues to move due to inertia, and the moving body bounces from the valve opening position. Consider the case of returning to the closed position. Even in this case, at the time of outputting the second valve opening signal, it becomes easy to push the bounding moving body back to the valve opening position, and it is possible to effectively suppress the occurrence of operation failure at the time of valve opening.

  According to the present invention, it is possible to effectively suppress the occurrence of a defective opening / closing operation of the solenoid valve.

It is a block diagram of the automatic water tap with which the water supply control apparatus which concerns on 1st Embodiment is used. It is a functional block diagram which shows the structure of the water supply control apparatus which concerns on 1st Embodiment. It is sectional drawing which shows the state which the valve part of the solenoid valve which concerns on 1st Embodiment is open. It is sectional drawing which shows the state which the valve part of the solenoid valve which concerns on 1st Embodiment is closed. (A) is a time chart showing the output of the power generation detection circuit when there is no abnormality in the closing operation of the solenoid valve, and (b) shows the output of the power generation detection circuit when there is an abnormality in the valve closing operation of the solenoid valve. It is a time chart which shows. It is a flowchart explaining the flow of the valve closing control process of a solenoid valve. (A) is a time chart showing the output of the power generation detection circuit when there is no abnormality in the valve opening operation of the solenoid valve, and (b) is the output of the power generation detection circuit when there is an abnormality in the valve opening operation of the solenoid valve. It is a time chart which shows. It is a flowchart explaining the flow of the valve opening control processing of a solenoid valve.

[First Embodiment]
FIG. 1 shows a configuration diagram of an automatic faucet 100 in which a water supply control device 10 according to the first embodiment is used. The automatic faucet 100 includes a water discharge pipe 101 and a water supply control device 10.

  The water discharge pipe 101 is fixed to the upper surface side of the counter 103 of the washstand. The water discharge pipe 101 is provided with a water discharge port 105 at the tip thereof. From the water outlet 105, the water supplied through the water supply path 107 for supplying water to this is discharged. The water supply channel 107 is provided from the water supply 108 to the water outlet 105, and is provided inside a water supply hose or the like.

  The water supply control device 10 controls water supply to the water outlet 105 and water stoppage. The water supply control device 10 includes a solenoid valve 20, a generator 50, an object detection sensor 60 (hereinafter also simply referred to as a sensor 60), and a control unit 70.

  The solenoid valve 20 is installed in the middle of the water supply channel 107. As will be described later, the solenoid valve 20 is controlled by a control unit 79 (described later) so as to switch water supply and water stop to the downstream side of the water supply channel 107 and to switch presence / absence of water discharge from the water discharge port 105.

  The generator 50 is installed on the downstream side of the electromagnetic valve 20 in the water supply channel 107. The generator 50 has a water wheel installed in the water supply channel 107, and the water wheel rotates when the water flow flowing through the water supply channel 107 hits the blades of the water wheel, and power is generated by the rotation. The generator 50 is configured such that the magnet and the coil are relatively rotated by the rotation of the water turbine, and the coil generates power by electromagnetic induction.

  The sensor 60 is an infrared distance measuring sensor having a light emitting unit and a light receiving unit. The sensor 60 is attached to the tip of the water discharge pipe 101. The sensor 60 projects light from the light emitting unit, receives light reflected from the detected object such as a human hand by the projected light by the light receiving unit, and is in a detection area within a predetermined range with respect to the sensor 60. It detects whether or not there is an object to be detected. The sensor 60 outputs a signal indicating the detection result of the detection object to the control unit 79 (described later).

  FIG. 2 is a functional block diagram showing the configuration of the water supply control device 10 according to the first embodiment. The control unit 70 controls the operation of the electromagnetic valve 20 and the sensor 60. The control unit 70 includes a power generation detection circuit 71 (power generation detection unit), a power source unit 73, and a control unit 79.

  The power generation detection circuit 71 detects the presence or absence of power generation by the generator 50. The power generation detection circuit 71 outputs a signal to the control unit 79 when there is power generation by the power generator 50, and does not output a signal to the control unit 79 when there is no power generation by the power generator 50. The power generation detection circuit 71 is configured by a shaping circuit that shapes the output waveform from the rectifier circuit that rectifies the alternating current output from the generator 50 into a rectangular wave and outputs the rectangular wave to the control unit 79.

  The power supply unit 73 supplies power to the control unit 79, the sensor 60, and the electromagnetic valve 20. The power supply unit 73 includes a power storage unit 75 and a backup battery 77. The power storage unit 75 is a capacitor, but may be configured by a secondary battery or the like. The power storage unit 75 stores a current obtained by rectifying an alternating current output from the generator 50 by a full-wave rectifier circuit or the like. The control unit 79, the sensor 60, and the electromagnetic valve 20 are driven using the power storage unit 75 as a main power source. The backup battery 77 is a dry battery, but is not limited to this. The backup battery 77 supplies electric power when the voltage of the power storage unit 75 becomes equal to or lower than a predetermined voltage, and drives the control unit 79, the sensor 60, and the electromagnetic valve 20.

  The control unit 79 is configured by a microcomputer. The control unit 79 outputs a control signal to the electromagnetic valve 20 based on the output signal from the sensor 60 and controls the opening and closing of the electromagnetic valve 20. Note that the control unit 79 may be realized by combining elements and circuits including a computer CPU and memory.

  3 shows a state where the valve portion 21 of the electromagnetic valve 20 is open, and FIG. 4 shows a state where the valve portion 21 is closed. The solenoid valve 20 is a latch type solenoid valve. The electromagnetic valve 20 includes a moving body 26, a permanent magnet 27, a fixed core 29, a coil 31, a spring 33 (biasing member), a ring body 35, and a housing 37. As will be described in detail, the latch electromagnetic valve moves the moving body 26 by energizing the coil 31, opens and closes the water supply passage 107 by opening and closing the valve portion 21 by moving the moving body 26, and magnetizes the permanent magnet 27. The movable body 26 is configured to be held in the valve opening position or the valve closing position by the fixed core 29 or the spring 33.

  The moving body 26 includes a plunger 23 and a valve body 25. The plunger 23 is held in an accommodating portion 37 a provided in the housing 37 so as to be capable of reciprocating in the axial direction. The valve body 25 is provided at the tip of the plunger 23. A valve chamber 109 is provided in the middle of the water supply passage 107, and the valve body 25 is disposed in the valve chamber 109. In the valve chamber 109, an inflow port 109a connected to the upstream side of the water supply channel 107 and an outflow port 109b connected to the downstream side of the water supply channel 107 are formed, and a valve seat 111 is provided at the peripheral portion of the outflow port 109b. The valve body 25 contacts and separates from the valve seat 111 to open and close the valve portion 21. The valve body 25 is provided with an elastic portion 25a formed of an elastic member such as rubber at a position where the valve body 25 is in contact with and separated from the valve seat 111.

  The permanent magnet 27 is disposed coaxially with the plunger 23. The fixed core 29 is disposed between the permanent magnet 27 and the plunger 23. The fixed core 29 is magnetized by the permanent magnet 27 and attracts the plunger 23 by its attractive force. The coil 31 is disposed so as to surround the plunger 23. The spring 33 is interposed between the fixed core 29 and the plunger 23, and biases the plunger 23 in the valve closing direction (downward direction in FIG. 3). The ring body 35 is disposed below the coil 31. The housing 37 is formed in a cup shape and houses the plunger 23 and the like.

  When the movable body 26 is in the valve opening position where the fixed core 29 and the plunger 23 are in contact with each other, the plunger 23 is attracted to the fixed core 29 by the magnetic force of the permanent magnet 27 and held in the valve opening position. On the other hand, the movable body 26 is held in the closed position by the urging force of the spring 33 when the elastic portion 26 a of the valve body 25 is in the closed position where it contacts the valve seat 111. The water supply channel 107 is opened when the moving body 26 is in the valve opening position, and is closed when the moving body 26 is in the valve closing position.

  In the electromagnetic valve 20, a magnetic path is formed from the permanent magnet 27 to the permanent magnet 27 through the fixed core 29, the plunger 23, the ring body 35, and the housing 37 when the coil 31 is not energized.

  In moving the moving body 26 of the electromagnetic valve 20 from the valve-opening position to the valve-closing position, the coil 31 generates a magnetic flux in a direction opposite to the flow direction of the magnetic flux flowing in the magnetic path (hereinafter referred to as the forward direction A). Energize to. As a result, the suction force of the fixed core 29 with respect to the plunger 23 is weakened, and the urging force of the spring 33 becomes larger than this suction force. The urging force moves the moving body 26 from the valve opening position and stops at the valve closing position. At this time, since the distance between the plunger 23 and the fixed core 29 is large, the attractive force of the fixed core 29 becomes weak, and even if the energization to the coil 31 is stopped, the urging force of the spring 33 is larger than the attractive force of the fixed core 29. The moving body 26 is stably held at the valve closing position.

  On the other hand, when the coil 31 is energized so as to generate a magnetic flux in a direction opposite to the forward direction A, the attractive force of the fixed core 29 against the plunger 23 is increased, and the attractive force of the fixed core 29 is greater than the urging force of the spring 33. The moving body 26 moves from the valve closing position by this suction force and stops at the valve opening position. At this time, since the distance between the plunger 23 and the fixed core 29 is small, the attractive force of the fixed core 29 becomes strong, and even if the energization to the coil 31 is stopped, the attractive force of the fixed core 29 remains larger than the urging force of the spring 33. Thus, the moving body 26 is stably held at the valve opening position. Thus, the moving body 26 of the electromagnetic valve 20 is stably held at the two positions of the valve closing position or the valve opening position.

  In moving the moving body 26 from the valve opening position to the valve closing position, the control unit 79 outputs a valve closing signal as a control signal for closing the electromagnetic valve 20. When receiving the valve closing signal, the solenoid valve 20 energizes the coil 31 so that a magnetic flux of a flow in the positive direction A is generated. On the other hand, when moving the moving body 26 from the valve closing position to the valve opening position, the control unit 79 outputs a valve opening signal as a control signal for opening the electromagnetic valve 20. When the solenoid valve 20 receives the valve opening signal, it energizes the coil 31 so that a magnetic flux in a direction opposite to the forward direction A is generated.

  While the valve opening signal is output, the electromagnetic valve 20 is subjected to a force for moving the moving body 26 from the valve closing position to the valve opening position. Further, the solenoid valve 20 is subjected to a force for moving the moving body 26 from the valve opening position to the valve closing position while the valve closing signal is output. This force refers to the suction force of the fixed core 29 and the biasing force of the spring 33.

  Here, the present inventor has come to recognize the following new problem in controlling the opening and closing of the electromagnetic valve 20.

  In the solenoid valve 20, the moving speed of the moving body 26 becomes slow due to the biting of foreign matter between the moving body 26 and the accommodating portion 37a or the elastic portion 25a of the moving body 26, adhesion, or adhesion of scale. There is a case where the output of the control signal stops before 26 completely stops at the planned stop position. In this case, if the moving body 26 continues to move due to inertia and the speed immediately after the stop of the output of the control signal is slow, the moving body 26 is pressed against the planned stop position by the suction force of the fixed core 29 and the biasing force of the spring 33, and the planned stop position. Stop completely. However, when the speed immediately after the stop of the output of the control signal is high, the moving body 26 tries to stabilize at the two positions of the valve opening position or the valve closing position, and therefore bounces due to the collision with the valve seat 111 or the fixed core 29, It was found that there was a case where the planned stop position was moved away to the movement start position by the momentum and stopped at the movement start position.

  In this case, according to the technique described in Patent Document 1, it is detected that the electromagnetic valve is not opened or closed, and the valve opening signal or the valve closing signal having the same output time as the initial valve opening signal or the valve closing signal is reproduced. Output. However, if a foreign object remains caught between a part of the moving body 26 and another member, the moving speed of the moving body 26 remains low, and even if a control signal having the same output time is output. The same operation was repeated, and the occurrence of the opening / closing failure of the solenoid valve 20 could not be sufficiently suppressed.

  Therefore, in the water supply control device 10 according to the present embodiment, the following control is executed. First, the control method for suppressing the occurrence of the valve closing malfunction of the electromagnetic valve 20 will be described. FIG. 5A is a time chart showing the output of the power generation detection circuit 71 when there is no abnormality in the closing operation of the electromagnetic valve 20.

  The electromagnetic valve 20 is open until time a1, and water is supplied from the electromagnetic valve 20 to the downstream side of the water supply passage 107, and water is discharged from the water outlet 105. At this time, the generator 50 generates power, and a rectangular pulse signal is output from the power generation detection circuit 71 to the control unit 79. The control unit 79 outputs a first valve closing signal of a predetermined output time Ta1 (s) to the electromagnetic valve 20 at time a1.

  The control unit 79 generates power by the generator 50 by the power generation detection circuit 71 within a predetermined detection time ta2 (s) after a predetermined standby time ta1 (s) has elapsed from the start of output of the first valve closing signal. It is determined whether or not is detected. In the illustrated example, the generator 50 does not generate power within the detection time ta <b> 2, and no pulse signal is output from the power generation detection circuit 71. In this case, the electromagnetic valve 20 is in a closed state, and it can be grasped that the water stoppage to the water discharge port 105 has been completed. Therefore, the control unit 79 does not perform any particular process.

  On the other hand, in the example of FIG. 5B, the generator 50 generates power within the detection time ta <b> 2, and a pulse signal is output from the power generation detection circuit 71. In this case, it can be grasped that the electromagnetic valve 20 is in the open state, the generator 50 generates power, and the water stoppage to the water outlet 105 is not completed.

  In this case, the control unit 79 according to the present embodiment outputs the second valve closing signal of the output time Ta2 (s) longer than the output time Ta1 of the first valve closing signal to the electromagnetic valve 20 after the elapse of the detection time ta2. To do. Thereby, the force which moves the mobile body 26 to a valve closing position acts for a time longer than the time of the output of a 1st valve closing signal. Here, the output of the first valve closing signal is stopped before the moving body 26 completely stops at the valve closing position when the first valve closing signal is output, and the moving body 26 continues to move due to inertia, Consider the case of bouncing from the valve closing position and returning to the valve opening position. Even in this case, when the second valve closing signal is output, it is easy to push the bounding moving body 26 back to the valve closing position, and it is possible to effectively suppress the occurrence of an operation failure when the valve is closed.

  The output time Ta2 only needs to be longer than the output time Ta1 of the first valve closing signal, and the range thereof is not limited. However, the lower limit thereof may be twice or more the output time Ta1. This lower limit is a value derived from experimental knowledge. The inventor studied the phenomenon in which the moving body 26 bounces from the planned stop position and returns to the movement start position. As a result, if the output time Ta2 of the second valve closing signal is set to be twice or more the output time Ta1 of the first valve closing signal, the moving body 26 is effectively stopped at the planned stop position without returning to the movement start position. And gained knowledge. Note that if the output time Ta2 is too long, the power consumption becomes excessive. Therefore, the required length may be set as the upper limit value in consideration of the power consumption.

  The standby time ta1 is set as a time that is assumed in design as the time from when the moving body 26 completely stops at the valve closing position after the first valve closing signal is output until the power generation by the generator 50 stops. . As the detection time ta2, when the generator 50 is generating power after the lapse of the standby time ta1, a time that is assumed in terms of design is set as a time required to detect this by the power generation detection circuit 71.

  FIG. 6 is a flowchart for explaining the flow of the valve closing control process of the electromagnetic valve 20 executed by the control unit 79 of the water supply control device 10. Here, the flow after the electromagnetic valve 20 is opened under the control of the control unit 79 and water is discharged from the water outlet 105 will be described.

  If the control part 79 acquires the detection signal which shows that a to-be-detected object does not exist in a detection area from the sensor 60 while the water discharge port 105 is discharging water (S10), it will output the 1st valve closing signal of output time Ta1. It outputs to the solenoid valve 20 (S12).

  The control unit 79 determines whether or not power generation by the power generator 50 is detected by the power generation detection circuit 71 within the detection time ta2 after the elapse of the standby time ta1 from the output start of the first valve closing signal (S14). If the control unit 79 does not acquire a pulse signal from the power generation detection circuit 71 (N in S14), the control unit 79 determines that the water stop of the water outlet 105 has been completed, and ends this flow (S16). On the other hand, when acquiring the pulse signal from the power generation detection circuit 71 (Y in S14), the control unit 79 outputs the second valve closing signal of the output time Ta2 to the electromagnetic valve 20 after the detection time ta2 has elapsed (S18).

  The control unit 79 determines whether or not power generation by the power generator 50 is detected by the power generation detection circuit 71 within the detection time ta2 after the elapse of the standby time ta1 from the start of output of the second valve closing signal (S20). If the control unit 79 does not acquire a pulse signal from the power generation detection circuit 71 (N in S20), the control unit 79 determines that the water stop of the water outlet 105 has been completed, and ends this flow (S16). On the other hand, if the control part 79 acquires a pulse signal from the electric power generation detection circuit 71 (Y of S20), it will determine whether the frequency | count of output of a 2nd valve closing signal is the 2nd time (S22).

  When it is determined that the number of times of output of the second valve closing signal is not the second time (N in S22), the control unit 79 outputs the second valve closing signal of the output time Ta2 to the solenoid valve 20 again after the detection time ta2 has elapsed. (S18). On the other hand, when it is determined that the number of times the second valve closing signal is output is the second time (Y in S22), the control unit 79 determines that an operation failure has occurred in the electromagnetic valve 20, and ends this flow (S16). ). In S22, it is determined whether or not the number of outputs of the second valve closing signal is the second time, but the number of times is not particularly limited as long as it can be determined whether or not the number of outputs is a predetermined number.

  The output times Ta1 and Ta2 are stored in advance in a recording unit (not shown) of the control unit 79, and the control unit 79 reads out from the recording unit and acquires them.

  Next, a control method for suppressing occurrence of valve opening malfunction of the electromagnetic valve 20 will be described. FIG. 7A is a time chart showing the output of the power generation detection circuit 71 when there is no abnormality in the opening operation of the electromagnetic valve 20.

  The electromagnetic valve 20 is in a closed state until time b1, the downstream side of the water supply passage 107 is stopped from the electromagnetic valve 20, and water is not discharged from the water outlet 105. At this time, the generator 50 does not generate power, and no pulse signal is output from the power generation detection circuit 71 to the control unit 79. The control unit 79 outputs a first valve opening signal for a predetermined output time Tb1 (s) to the electromagnetic valve 20 at time b1.

  The controller 79 generates power by the generator 50 by the power generation detection circuit 71 within a predetermined detection time tb2 (s) after the elapse of a predetermined standby time tb1 (s) from the output start of the second valve opening signal. It is determined whether or not is detected. In the example shown in the figure, the generator 50 is generating power within the detection time tb2, and a pulse signal is output from the power generation detection circuit 71. In this case, since the solenoid valve 20 is in the open state and it can be grasped that the water discharge to the water discharge port 105 is completed, the control unit 79 does not particularly perform the process.

  On the other hand, in the example of FIG. 7B, the generator 50 does not generate power within the detection time tb2, and no pulse signal is output from the power generation detection circuit 71. In this case, it can be grasped that the electromagnetic valve 20 is in a closed state and the water discharge to the water discharge port 105 is not completed.

  In this case, after the elapse of the detection time tb2, the control unit 79 according to the present embodiment outputs a second valve closing signal having an output time Tb2 (s) longer than the output time Tb1 of the first valve opening signal to the electromagnetic valve 20. To do. Thereby, the force which moves the mobile body 26 to a valve-opening position acts over a longer time than when the first valve-opening signal is output. Here, the output of the first valve opening signal stops before the moving body 26 completely stops at the valve opening position when the first valve opening signal is output, and the moving body 26 continues to move due to inertia, Consider the case of bouncing from the valve opening position and returning to the valve closing position. Even in this case, when the second valve opening signal is output, the bound moving body 26 can be easily pushed back to the valve opening position, and the occurrence of an operation failure at the time of valve opening can be effectively suppressed.

  Similarly to the output time Ta2 of the second valve closing signal, this output time Tb2 may be longer than the output time Tb1 of the first valve opening signal, and the range thereof is not limited. It is good also as 2 times or more of Tb1. The reason is the same as the output time Ta2 of the second valve closing signal.

  Note that the standby time tb1 is set as a time that is assumed in design as the time from when the moving body 26 completely stops at the valve opening position after the first valve closing signal is output and when power generation by the generator 50 starts. . As the detection time tb2, when the generator 50 is generating power after the standby time tb1 has elapsed, a time that is assumed in design is set as a time required to detect this by the power generation detection circuit 71.

  FIG. 8 is a flowchart for explaining the flow of the valve opening control process of the electromagnetic valve 20 executed by the control unit 79 of the water supply control device 10. Here, the flow after the electromagnetic valve 20 is closed under the control of the control unit 79 and the water outlet 105 is stopped will be described.

  If the control part 79 acquires the detection signal which shows that the to-be-detected object exists in a detection area from the sensor 60 while the water outlet 105 has stopped water (S30), the 1st valve opening signal of output time Tb1 Is output to the solenoid valve 20 (S32).

  The control unit 79 determines whether or not power generation by the generator 50 is detected by the power generation detection circuit 71 within the detection time tb2 after the elapse of the standby time tb1 from the output start of the first valve opening signal (S34). If the control part 79 acquires a pulse signal from the electric power generation detection circuit 71 (Y of S34), it will judge that the water discharge to the water discharge port 105 was completed, and will complete | finish this flow (S36). On the other hand, if the control unit 79 does not acquire the pulse signal from the power generation detection circuit 71 (N in S34), after the detection time tb2 has elapsed, the control unit 79 outputs the second valve opening signal of the output time Tb2 to the electromagnetic valve 20 (S38). ).

  The control unit 79 determines whether or not power generation by the generator 50 is detected by the power generation detection circuit 71 within the detection time tb2 after the elapse of the standby time tb1 from the output start of the second valve opening signal (S40). If the control part 79 acquires a pulse signal from the electric power generation detection circuit 71 (Y of S40), it will judge that the water discharge to the water discharge port 105 was completed, and will complete | finish this flow (S36). On the other hand, if the control unit 79 does not acquire the pulse signal from the power generation detection circuit 71 (N in S40), the control unit 79 determines whether or not the second valve opening signal is output for the second time (S42).

  When it is determined that the number of times the second valve opening signal is output is not the second time (N in S42), the control unit 79 outputs the second valve opening signal at the output time Tb2 to the solenoid valve 20 again after the detection time tb2 has elapsed. (S38). On the other hand, when it is determined that the number of times the second valve opening signal is output is the second time (Y in S42), the control unit 79 determines that an operation failure has occurred in the electromagnetic valve 20, and ends this flow (S36). ).

  According to the water supply control device 10 according to the above-described embodiment, the occurrence of the opening / closing operation failure of the electromagnetic valve 20 can be suppressed.

  Further, as another means for suppressing the occurrence of the opening / closing failure of the electromagnetic valve 20, it is conceivable that the time interval for outputting the first valve opening signal or the first valve closing signal is made longer in advance. However, the output time of the control signal is usually set to be short so as to approach the minimum necessary time until the moving body 26 is moved from the movement start position to the planned stop position and stopped in order to reduce power consumption. . In this respect, according to the water supply control device 10 according to the present embodiment, it is not necessary to lengthen the output time of the first valve opening signal or the first valve closing signal, and the opening / closing operation of the electromagnetic valve 20 while suppressing power consumption. The occurrence of defects can be suppressed.

  As mentioned above, although this invention was demonstrated based on embodiment, embodiment only shows the principle and application of this invention. In the embodiment, many modifications and arrangements can be made without departing from the spirit of the present invention defined in the claims.

  The case where the water supply control device 10 according to the above-described embodiment is used for the automatic faucet 100 is illustrated. In addition to this, the water supply control device 10 may be used for a urinal, a urinal, and the like.

  The solenoid valve 20 is not limited to a latch solenoid valve, and may be a continuous energization solenoid valve. The generator 50 only needs to be able to generate power with the water flow in the water supply channel 107, and a known structure for the power generation may be used. Further, the mounting position of the sensor 60 is not limited to the water discharge pipe 101. Moreover, the sensor 60 should just detect whether the to-be-detected object exists in a predetermined detection area, and the other well-known detection system for that may be used.

  The power generation detection circuit 71 according to the above-described embodiment is exemplified as a power generation detection unit that detects the presence or absence of power generation by the generator 50. The power generation detection unit only needs to be able to detect the presence or absence of power generation by the generator 50 and to output a signal to the control unit 79 when there is power generation by the power generator 50. You may comprise by a rotation sensor etc.

  In addition, the water supply control device 10 may include an error notification unit that notifies the user of the occurrence of an opening / closing failure of the electromagnetic valve 20. The error notification unit includes a light emitting unit such as an LED and a display unit such as a liquid crystal display. When the opening / closing operation failure occurs in the electromagnetic valve 20, the error notification unit notifies the user of this by turning on the light emitting unit or displaying the display unit. When determining that the number of times the second valve closing signal is output is the predetermined number in S22 described above, the control unit 79 notifies the user of the occurrence of the opening / closing failure of the electromagnetic valve 20 by controlling the error notification unit. Good. The same applies when it is determined in S42 described above that the number of outputs of the second valve opening signal is a predetermined number.

  DESCRIPTION OF SYMBOLS 10 Water supply control apparatus, 20 Solenoid valve, 50 Generator, 71 Power generation detection circuit (power generation detection part), 79 Control part, 107 Water supply path.

Claims (2)

A solenoid valve installed in the water supply channel;
A generator for generating electricity by a water flow in the water supply channel;
A power generation detector for detecting the presence or absence of power generation by the generator;
A control unit that outputs a control signal to the solenoid valve and controls opening and closing of the solenoid valve, and
The control unit is configured to detect power generation by the power generator by the power generation detection unit within a predetermined detection time after a lapse of a standby time from the start of output of the first valve closing signal for closing the electromagnetic valve. A water supply control device that outputs a second valve closing signal having a longer output time than the first valve closing signal. A solenoid valve installed in the water supply channel;
A generator for generating electricity by a water flow in the water supply channel;
A power generation detector for detecting the presence or absence of power generation by the generator;
A control unit that outputs a control signal to the solenoid valve and controls opening and closing of the solenoid valve, and
The control unit has not detected power generation by the generator by the power generation detection unit within a predetermined detection time after elapse of a standby time from the start of output of the first valve opening signal for opening the electromagnetic valve. In this case, the water supply control device outputs a second valve opening signal having a longer output time than the first valve opening signal.

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