JP2009084792A - Faucet control device and faucet system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a faucet control device which makes a sensor and a control portion separated from each other, and closes a self-holding type electromagnetic valve by means of one microcomputer at power shutdown. <P>SOLUTION: The sensor 11 comprises the microcomputer 25 which performs an opening/closing selection output and a current-carrying command output on the basis of outputs from object detectors 21-23 to first and second signal lines B and A. The control portion 12 comprises a logic circuit 35 which outputs an opening/closing driving signal according to the opening/closing selection output of the first signal line and the current-carrying command output of the second signal line; a valve driving circuit 36 which closes the electromagnetic valve 6 according to the opening/closing driving signal; and a power shutdown detector 32. The microcomputer performs a current-carrying command output according to the detection of the shutdown detection output from the power shutdown detector 32 performed for the first signal line via the first signal line. The logic circuit outputs the closing driving signal according to the shutdown detection output and the current-carrying command output. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a faucet control device that opens and closes a water supply path to a faucet according to a detection result of an object such as a hand.

  In the faucet control device as described above, an electromagnetic valve is often used to open and close the water supply channel. In particular, in order to reduce power consumption, so-called self-holding electromagnetic valves that maintain the state even when energization is stopped after the opening / closing operation are often used.

In addition, in the faucet control device, there may be a case where design and ease of use are improved by separating a sensor unit for detecting an object and arranging it near the water outlet, with respect to the control unit for controlling the electromagnetic valve. (See Patent Documents 1 and 2). In this case, a microcomputer is provided in each of the sensor unit and the control unit, and communication between the two microcomputers enables control of the electromagnetic valve according to the object detection result by the sensor unit.
Japanese Patent Laid-Open No. 2002-70096 JP 2002-180517 A

  In a faucet control device using a self-holding electromagnetic valve, there is a problem that the water discharge state continues if the power supply is cut off due to a power failure or the like when the electromagnetic valve is in the open state (water discharge state).

  For this reason, in the case where a microcomputer is provided in the control unit as in the faucet control device disclosed in Patent Document 2, it is determined whether or not the microcomputer is turned off, and the water discharge state Such a problem can be solved by providing a function of closing the electromagnetic valve when the power source is cut off.

  However, providing a microcomputer in each of the sensor unit and the control unit leads to an increase in cost, so that it is also desired to configure a faucet control device using one microcomputer.

  On the other hand, a microcomputer is not provided in the control unit, and a signal for opening and closing the electromagnetic valve through separate signal lines from the microcomputer of the sensor unit and a signal for closing the electromagnetic valve drive circuit (see, for example, reference numeral 36 in FIG. 2) It is also conceivable that the control unit has a circuit for detecting power-off and inputting a closing operation signal to the drive circuit. However, in this configuration, if a closing operation signal due to power shutoff is input in a state where an opening operation signal is input from the microcomputer of the sensor unit, a through current flows through the driving circuit, which causes a failure of the driving circuit. Connected.

  The present invention relates to a faucet control device in which a sensor unit and a control unit are separated, and using a single microcomputer, the self-holding operation of a self-holding electromagnetic valve with two signal lines and the self-holding when the power is shut off Provided is a faucet control device that can ensure the closing operation (water stopping operation) of the electromagnetic valve.

  A faucet control device according to one aspect of the present invention includes a self-holding electromagnetic valve that opens and closes a water supply path to a faucet, an object detector that detects an object, and an open / closed state that corresponds to an output from the object detector. A sensor unit including a microcomputer for performing a close selection output and an energization command output on the first signal line and the second signal line, respectively, an open / close selection output of the first signal line, and a second signal line A logic circuit that outputs an open / close drive signal according to an energization command output, a valve drive circuit that opens / closes an electromagnetic valve according to an open / close drive signal, and a power shut-off detector that detects power shut-off Including a control unit. The power cutoff detector outputs a cutoff detection output to the first signal line when the power is cut off. The microcomputer outputs an energization command output in response to detecting the interruption detection output via the first signal line, and the logic circuit outputs a closed drive signal in accordance with the interruption detection output and the energization command output. It is characterized by doing.

  According to this configuration, when the power is shut off, the shut-off detection output from the power shut-off detector performed on the first signal line that is the open / close selection output line, and the microcomputer on the second signal line The electromagnetic valve can be closed by the operation of the logic circuit according to the energization command output. For this reason, a single microcomputer (sensor unit) and a logic circuit (control unit) connected by two signal lines can realize an opening / closing operation of the self-holding electromagnetic valve and a water stop function when the power is shut off.

  In this configuration, it is preferable that the shutoff detection output has the same logic value as the closed selection output in the logic circuit, because the configuration of the logic circuit becomes simpler.

  Further, the microcomputer may continue to output the energization command for a predetermined time after detecting the shutoff detection output.

  Thereby, even when the electromagnetic valve is in the open state or when the power is shut off during the opening operation of the electromagnetic valve, the electromagnetic valve can be closed more reliably. That is, a power failure occurs when the electromagnetic valve is open, and the electromagnetic valve closing time can be reliably ensured, so that the water stop operation during a power failure is ensured.

  Further, the microcomputer may stop the operation of the object detector in response to detecting the interruption detection output.

  As a result, the power necessary for closing the electromagnetic valve when the power is shut off (for example, the power accumulated in the device) can be prevented from being consumed by the object detector, and a power failure occurs when the electromagnetic valve is open. However, since the electromagnetic valve closing time can be secured, the closing operation at the time of a power failure can be performed more reliably.

  And by using such a faucet control device, it is possible to realize a faucet system having a water stop function at the time of power interruption at low cost.

  According to the present invention, a single microcomputer (sensor unit) and a logic circuit (control unit) connected by two signal lines can perform the opening / closing operation of the self-holding electromagnetic valve and the water stop function when the power is shut off. An realized faucet control device can be provided.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, the structure of the faucet system provided with the faucet control apparatus which is an Example of this invention is shown.

  In FIG. 1, reference numeral 1 denotes a spout as a water faucet, which is fixed to the upper surface of the wash basin counter 7. A water pipe 2 is accommodated inside the spout 1. The tip opening of the water conduit 2 is fixed to the inside of the spout of the spout 1.

  Reference numeral 3 denotes a water supply channel that supplies water from the water supply to the water pipe 2 through the water stop valve 4 and the constant flow valve 5. The water stop valve 4 is a manually operated valve for switching between the flow of tap water into the water supply channel 3 and the shutoff thereof. The constant flow valve 5 allows tap water having a constant flow rate to flow into the water supply channel 3 regardless of fluctuations in water pressure.

  Reference numeral 6 denotes an electromagnetic valve which is provided downstream of the constant flow valve 5 in the water supply path 3 and opens and closes the water supply path 3 by being controlled by the control unit 12. By opening the electromagnetic valve 6, tap water from the water supply channel 3 flows out from the spout of the spout 1 through the water conduit 2. Moreover, the water discharge from the spout 1 is stopped by the electromagnetic valve 6 being closed.

  The electromagnetic valve 6 is a self-holding electromagnetic valve, also called a latching solenoid valve, which operates from a closed state to an open state (opening operation) by energizing the solenoid coil in one direction, and then energizes the solenoid coil. Even if it is shut off, it remains open. Further, after the solenoid coil is energized in the other direction to operate from the open state to the closed state (closed operation), the closed state is maintained even if the energization to the solenoid coil is interrupted.

  Reference numeral 11 denotes a sensor unit which detects a hand (object) 8 approaching the spout 1. The control unit 12 controls the electromagnetic valve 6 in accordance with signals from the sensor unit 11 (open / close selection output and energization command output described later). The sensor unit 11 is housed inside the spout 1 and is separated from the control unit 12. The electromagnetic valve 6 and the control unit 12 are accommodated below the wash basin counter 7.

  In FIG. 2, the structure of the faucet control apparatus comprised by the sensor part 11 and the control part 12 which were mentioned above is shown. Between the sensor unit 11 and the control unit 12, a power line (denoted as “power source” in the figure), a GND line (denoted as “GND” in the figure), a signal line A (second signal line), and A signal line B (first signal line) is provided.

  The sensor unit 11 includes a light projecting element 21, a light receiving element 22, an object detection processing circuit 23 that constitute an object detector, and a microcomputer 25.

  The object detection processing circuit 23 causes the light projecting element 21 to emit light in response to a command from the microcomputer 25. Infrared light is emitted from the light projecting element 21, and the infrared light reflected by the hand 8 is received by the light receiving element 22 and converted into a current, so that the object detection processing circuit 23 detects the hand 8. The object detection processing circuit 23 outputs an object detection signal to the microcomputer 25 in response to detecting the hand 8.

  The microcomputer 25 operates according to a computer program stored therein. The microcomputer 25 instructs the object detection processing circuit 23 to emit light at a predetermined cycle.

  Further, the microcomputer 25 performs an open selection output (H) for the signal line B in a state where no object detection signal is input from the object detection processing circuit 23, and switches from the state in which no object detection signal is input to the input state. At this time, this open selection output (H) is maintained. On the other hand, when the object detection signal is switched from the input state to the non-input state, the microcomputer 25 performs the closed selection output (L) for the signal line B for a predetermined time, and after the predetermined time has elapsed, the signal is output. An open selection output (H) is performed for line B.

  Further, the microcomputer 25 outputs a non-energization command (H) to the signal line A when no object detection signal is input. On the other hand, when the object detection signal is switched from the non-input state to the input state and when the input state is switched to the non-input state, the energization command output (L) is supplied to the signal line A for a predetermined time ( The predetermined time during which the close selection output is performed may be the same as or different from the predetermined time), and the non-energization command output (H) is performed after the predetermined time has elapsed.

  The control unit 12 includes a power supply circuit 31, a power failure detector 32 as a power interruption detector, a logic circuit 35, and a valve drive circuit 36.

  The power supply circuit 31 generates a DC power supply having a predetermined voltage from (AC power supply) AC as an external power supply. In the power supply circuit 31, there is provided a capacitor 31a for generating a DC power supply and for accumulating charges necessary for driving the electromagnetic valve 6 to be closed during a power failure (when the power supply is shut off).

  The power failure detector 32 monitors the periodic change of the voltage of the commercial power supply AC, and performs the non-power failure detection output (H: High level output) when there is the periodic change (when there is no power failure). On the other hand, when the period change disappears, it is regarded as a power failure and a power failure detection output (L) is performed as a shutoff detection output. These non-power failure / power failure detection outputs (H, L) from the power failure detector 32 are applied to the signal line B. Note that (H) means High level, and (L) means Low level output. This is the same for the other outputs.

  In addition, the “power failure” (or power interruption) in the present embodiment is such that the supply of commercial power from the electric power company is stopped or the supply of commercial power to the apparatus is stopped by the breaker shut-off operation. This includes not only a general power failure but also a case where the supply of AC power to the apparatus is stopped when the plug of the apparatus is unplugged from a commercial power outlet.

  The logic circuit 35 is configured by a logic IC, and the logic circuit 35 corresponds to the open / close selection output (H, L) of the signal line B and the non-energization / energization command output (H, L) of the signal line A. The open / close drive signal is output with the logic shown in FIG.

  Specifically, the logic circuit 35 outputs an open drive signal according to the open selection output (H) of the signal line B and the energization command output (L) of the signal line A. Further, a closed drive signal is output according to the closed selection output (L) of the signal line B and the energization command output (L) of the signal line A. In other cases, the open / close drive signal is not output. Further, when the power failure detection output (L) from the power failure detector 32 is made to the signal line B, the logic circuit 35 responds to the power failure detection output (L) and the energization command output (L) of the signal line A. To output an open drive signal. That is, the power failure detection output has the same logical value L as the closed selection output in the logic circuit 35.

  Here, the microcomputer 25 detects whether or not a power failure detection output (L) has been performed on the signal line B through the detection line b connected to the signal line B (that is, via the signal line B). . Specifically, even though the microcomputer 25 performs the open selection output (H) on the signal line B, the power line detection is detected by the signal line B being at the low level by the power failure detection output (L). It can be detected that the output (L) is being performed. In response to this detection, the microcomputer 25 performs an energization command output (L) for the signal line A.

  During a non-power failure, the power failure detector 32 outputs a non-power failure detection output (H) to the signal line B. In this state, the microcomputer 25 outputs a closed selection output (L) to the signal line B. In this case, the closed selection output, which is a low level output, is input to the logic circuit 35.

  For example, as shown in FIG. 2, the logic circuit 35 includes a negative logic input AND gate G1 that receives the signal line B and the signal line A, a NOT gate G2 that receives the signal line B, and an output of the NOT gate G2. And a negative logic input AND gate G3 having the signal line A as an input. The AND gate G1 outputs a closed drive signal, and the AND gate G3 outputs an open drive signal.

  However, the configuration of the logic circuit 35 shown in FIG. 2 is an example, and other configurations may be adopted as long as the configuration shown in Table 3 can be realized.

  The valve drive circuit 36 has a circuit configuration as shown in FIG. 2, for example, and causes a current to flow in one direction (closed direction) through the solenoid coil 6a of the latching solenoid of the electromagnetic valve 6 in response to a closing drive signal from the AND gate G1. In response to an open drive signal from the AND gate G3, a current is passed through the solenoid coil 6a in the other direction (open direction). The electromagnetic valve 6 opens / closes according to the energization direction to the solenoid coil 6a to open / close the water supply path 3 shown in FIG.

  Here, the AND gate G1 of the logic circuit 35 shown in FIG. 2 is closed only when not only the power failure detection output (L) of the signal line B but also the energization command output (L) of the signal line A is input in the event of a power failure. A logical product gate that outputs a drive signal. For this reason, when the electromagnetic valve 6 is already in the closed state, the energization command output (L) from the microcomputer 25 is not performed so that the close drive signal is not input to the valve drive circuit 36. it can. Thereby, when the electromagnetic valve 6 is in the closed state, it is possible to avoid the occurrence of a so-called reverse latch state in which the electromagnetic valve 6 is rarely opened due to further input of the closing drive signal.

  The configuration of the valve drive circuit 36 shown in FIG. 2 is also an example, and other configurations may be adopted.

  Hereinafter, the operation of the faucet control device of the present embodiment will be described using the flowchart of FIG. 4 and the time charts shown in FIGS. 5 to 7, in order from the top, the presence or absence of detection of the hand 8 by the object detector (the presence or absence of the object detection output C), the deenergization / energization command output state for the signal line A, the open / Closed selection output and power failure detection output status, solenoid valve open / close (water discharge / water stop) status (FIGS. 5 and 6 only), occurrence of power failure, and object detector operation / stop status (FIG. 6) And FIG. 7 only).

  5 is a time chart in a normal state where no power failure occurs, FIG. 6 is a time chart when a power failure occurs during water discharge, and FIG. 7 is a case where a power failure occurs during the opening operation of the electromagnetic valve 6. Each time chart is shown.

  In step (abbreviated as S in the figure) 101, the microcomputer 25 operates the object detector in response to a main power switch (not shown) provided in the control unit 12 being turned on. To start. At this stage, it is assumed that the electromagnetic valve 6 is in a closed state and no power failure has occurred.

  Next, in step 102, the microcomputer 25 outputs a non-energization command output (H) to the signal line A and outputs an open selection output (H) to the signal line B (FIGS. 5 to 7). Time t0 to t1). In this state (signal lines A, B = H, H), as can be seen from FIG. 3, the open / close drive signal is not output from the logic circuit 35, and the electromagnetic valve 6 is maintained in the closed state.

  Next, in step 103, the microcomputer 25 determines whether or not the object detection signal C from the object detector is switched from the non-input state to the input state. This determination is performed by comparing the presence / absence information of the object detection signal C stored in a memory (not shown) in the previous routine with the presence / absence information of the object detection signal C captured in the current routine. When the object detection signal C is switched from the non-input state to the input state (time t1 in FIGS. 5 and 6), the process proceeds to step 104. Otherwise, the process proceeds to step 107.

  In step 104, the microcomputer 25 starts outputting the energization command output (L) for the signal line A and maintains the output of the open selection output (H) for the signal line B. As a result, the signal lines A, B = L, H are generated, an opening drive signal is output from the logic circuit 35 (AND gate G3), and the electromagnetic valve 6 is opened. Therefore, water flows out from the spout of the spout 1 that has been in a water-stopping state so far. The microcomputer 25 also starts a timer count at this step.

  Next, in step 105, the microcomputer 25 monitors the timer count value and determines whether or not a predetermined time has elapsed since the start of output of the energization command output (L) for the signal line A in step 104. As the predetermined time, a time during which the electromagnetic valve 6 operates reliably from the closed state to the open state is set. If the predetermined time has not yet elapsed, the process proceeds to step 120. If the predetermined time has elapsed, the process proceeds to step 110.

  In step 110, the microcomputer 25 performs the de-energization command output (H) for the signal line A and performs the open selection output (H) for the signal line B (time t2 in FIGS. 5 and 6). . Thereby, it becomes signal line A, B = H, H, the electromagnetic valve 6 is maintained in an open state, and the water discharge from the spout 1 is continued.

  Next, in step 111, the microcomputer 25 determines whether or not the signal line B is at a low level, that is, whether or not a power failure detection output is performed on the signal line B from the power failure detector 32 (whether a power failure has occurred). Or not). If the signal line B is not at the low level, the process returns to step 103. If the signal line B is at the low level, the process proceeds to step 130 to start the water stop process at the time of power failure.

  On the other hand, if it is determined in step 103 that the object detection signal C is not switched from the non-input state to the input state and the process proceeds to step 107, the microcomputer 25 switches from the input state of the object detection signal C to the non-input state. It is determined whether or not there was. When the switching has occurred (see time t3 in FIG. 5), the process proceeds to step 108, and when there is no switching, the process returns to step 103.

  In step 108, the microcomputer 25 starts outputting the energization command output (L) to the signal line A and starts outputting the closed selection output (L) to the signal line B. As a result, the signal lines A, B = L, L are obtained, and a closing drive signal is output from the logic circuit 35 (AND gate G1), and the electromagnetic valve 6 is closed. Therefore, water discharge from the spout 1 stops (water stops). The microcomputer 25 also starts a timer count at this step.

  Next, in step 109, the microcomputer 25 monitors the timer count value, and determines whether or not a predetermined time has elapsed from the start of output of the energization command output (L) and the close selection output (L) in step 108. To do. As the predetermined time, a time during which the electromagnetic valve 6 operates reliably from the open state to the closed state is set. If the predetermined time has not yet elapsed, this step is repeated, and if the predetermined time has elapsed, the process proceeds to step 110.

  In step 110, as described above, the microcomputer 25 performs the de-energization command output (H) for the signal line A and performs the open selection output (H) for the signal line B (time in FIG. 5). t4). Thereby, the electromagnetic valve 6 is maintained in the closed state, and the water stop state of the spout 1 is continued. Further, the process proceeds from step 110 to step 111, and the microcomputer 25 determines whether or not the signal line B has become a low level (whether or not a power failure has occurred). If the signal line B is not at the low level, the process returns to step 103. If the signal line B is at the low level, the process proceeds to step 130 to start the water stop process at the time of power failure.

  Next, the water stop process at the time of a power failure is demonstrated, referring FIG.6 and FIG.7. As shown in FIG. 6, when it is determined that the signal line B has become a low level in step 111 during water discharge, and the process proceeds to step 130, the microcomputer 25 determines whether or not the current electromagnetic valve 6 is in a closed state. To do. This determination can be made by updating and storing the state change (open / close selection output) of the electromagnetic valve 6 for each energization command output from the start of operation of the present apparatus. If the electromagnetic valve 6 is in the closed state, the process proceeds to step 135, and if not, the process proceeds to step 131.

  In step 131, the microcomputer 25 outputs an energization command (L) to the signal line A (time t5 in FIG. 6). As a result, the signal lines A, B = L, L, and the closed drive signal is output from the logic circuit 35. In step 132, the microcomputer 25 stops (OFF) the operation of the object detector. The microcomputer 25 also starts timer counting at this step.

  When the closing drive signal is output from the logic circuit 35, the current due to the electric charge accumulated in the capacitor 31a in the power supply circuit 31 flows to the solenoid coil 6a, and the electromagnetic valve 6 is closed. At this time, by stopping the operation of the object detector, the electric power generated by the electric charge accumulated in the capacitor 31a in the object detector is wasted, and the occurrence of the situation where the closing operation of the electromagnetic valve 6 is not completed is avoided. . Further, the capacity of the capacitor 31 can be reduced, and the control unit 12 can be reduced in size.

  In step 133, the microcomputer 25 monitors the timer count value and determines whether or not a predetermined time has elapsed since the start of the output of the energization command output (L) in step 131. As the predetermined time, a time during which the electromagnetic valve 6 operates reliably from the open state to the closed state is set. If the predetermined time has not yet elapsed, this step is repeated, and if the predetermined time has elapsed, the process proceeds to step 134. In this way, the water stop process in the event of a power failure during water discharge is completed.

  In step 134, the microcomputer 25 outputs a non-energization command (H) to the signal line A (time t6 in FIG. 6). Thereby, the signal lines A, B = H, L (L is a power failure detection output), and the electromagnetic valve 6 is maintained in the closed state.

  On the other hand, when it is determined in step 130 that the electromagnetic valve 6 is in the closed state and the process proceeds to step 135, the microcomputer 25 stops the operation of the object detector (OFF). Then, this flow ends.

  If the electromagnetic valve 6 is originally in a closed state, a water stop state can be ensured even if a power failure occurs at this time, so that the energization command output (L) is not output here. Further, if the closing drive signal is output from the logic circuit 35 due to the output of the energization command output (L) when the electromagnetic valve 6 is in the closed state, the above-described reverse latch may occur, so this is avoided. In this sense, the energization command output (L) is not output. However, processing for stopping the operation of the unnecessary object detector is performed.

  If it is determined in step 105 that the predetermined time has not elapsed after the start of the opening operation of the electromagnetic valve 6 (that is, during the opening operation of the electromagnetic valve 6), the microcomputer 25 proceeds to step 111. Do the same process. That is, it is determined whether or not the signal line B has become a Low level (whether or not a power failure has occurred and a power failure detection output has been performed on the signal line B from the power failure detector 32). When the signal line B becomes the Low level (time t7 in FIG. 7), the process proceeds to Step 121, and when not, the process returns to Step 105. When the signal line B becomes low level, since the energization command output (L) has already been made to the signal line A from step 104 for the opening operation of the electromagnetic valve 6, the signal line A, B = L, L, and logic A closed drive signal is output from the circuit 35.

  The microcomputer 25 also starts a timer count at this step.

  Further, in step 121, the microcomputer 25 stops (OFF) the operation of the object detector. The reason is the same as the reason why the operation of the object detector is stopped in the previous step 132.

  When the closing drive signal is output from the logic circuit 35, a current due to the electric charge accumulated in the capacitor 31a flows to the solenoid coil 6a, and the electromagnetic valve 6 is closed. In step 122, the microcomputer 25 monitors the timer count value and determines whether or not a predetermined time T has elapsed after detection of the power failure detection output in step 120 (or after the start of the closing operation of the electromagnetic valve 6). judge. The predetermined time T is a time during which the electromagnetic valve 6 is reliably operated from the state in the middle of the opening operation to the closed state, and may be set longer than the predetermined time in Step 109 and Step 133.

  If the predetermined time T has not yet elapsed, this step is repeated, and if the predetermined time T has elapsed, the process proceeds to step 134. In this way, the water stop process when a power failure occurs during the opening operation of the electromagnetic valve 6 is completed.

  In step 134, the microcomputer 25 outputs a non-energization command (H) to the signal line A (time t8 in FIG. 6). Thereby, the signal lines A, B = H, L, and the electromagnetic valve 6 is maintained in the closed state.

  Note that the flow chart of FIG. 4 does not describe the water stop process associated with a power failure when the electromagnetic valve 6 is in the middle of the closing operation. This is because when the electromagnetic valve 6 is in the closed state (signal lines A, B = L, L), if the closing operation is continued as it is, the closed state is obtained and water stoppage is secured.

  During the closing operation of the electromagnetic valve 6, since the signal line B is at the low level before and after the power failure detection output is performed on the signal line B, whether or not the power failure detection output is performed via the signal line B. Cannot be detected. However, if a non-energization command output (H) is performed on the signal line A when the predetermined time T has elapsed in step 109 (step 110), the signal line B immediately becomes low level due to the power failure detection output. It can be detected (step 111). Therefore, the operation of the object detector can be stopped according to the detection (steps 130 and 135).

  As described above, according to the present embodiment, at the time of a power failure, the power failure detection output from the power failure detector 32 performed on the signal line B which is the open / close selection output line, and the microcomputer in the signal line A The electromagnetic valve 6 can be closed by the operation of the logic circuit 35 according to the energization command output from 25. For this reason, the water stop function at the time of power-off is realized by one microcomputer 25 (sensor unit 11) and logic circuit 35 (control unit 12) separated from each other and connected by two signal lines A and B. it can.

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

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the faucet system provided with the faucet control apparatus which is an Example of this invention. The block and circuit diagram which show the structure of the faucet control apparatus of an Example. The table | surface which shows the logic of the logic circuit used for the faucet control apparatus of an Example. The flowchart which shows operation | movement of the faucet control apparatus of an Example. In an Example, the time chart which shows operation | movement of the faucet control apparatus in the normal state which does not generate | occur | produce a power failure. The time chart which shows the water stop process when a power failure arises in the water discharge in an Example. The time chart which shows the water stop process when a power failure occurs in the middle of opening operation of an electromagnetic valve in an Example. The time chart which shows the water stop process when a power failure occurs in the middle of closing operation of an electromagnetic valve in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spout 2 Water pipe 3 Water supply path 6 Self-holding electromagnetic valve 6a Latching solenoid 11 Sensor part 12 Control part 21 Light emitting element 22 Light receiving element 23 Object detection processing circuit 25 Microcomputer 31 Power supply circuit 31a Capacitor 32 Power failure detector 35 Logic circuit 36 Valve drive circuit A, B Signal line

Claims (5)

A self-holding solenoid valve that opens and closes the water supply path to the faucet;
An object detector for detecting an object, and a sensor including a microcomputer that performs an open / close selection output and an energization command output in accordance with an output from the object detector with respect to the first signal line and the second signal line, respectively. And
A logic circuit for outputting an open / close drive signal in response to the open / close selection output of the first signal line and the energization command output of the second signal line; and the electromagnetic in response to the open / close drive signal. A valve drive circuit for performing the opening / closing operation of the valve, and a control unit including a power shutoff detector for detecting power shutoff,
The power shutoff detector performs a shutoff detection output for the first signal line when the power is shut off,
The microcomputer performs the energization command output in response to detecting the shutoff detection output via the first signal line,
The faucet controller according to claim 1, wherein the logic circuit outputs the closing drive signal according to the shutoff detection output and the energization command output.   The faucet control device according to claim 1, wherein the shutoff detection output has the same logical value as the closed selection output in the logic circuit.   The faucet control device according to claim 1 or 2, wherein the microcomputer continuously outputs the energization command output for a predetermined time after the detection of the shutoff detection output.   4. The faucet control device according to claim 1, wherein the microcomputer stops the operation of the object detector in response to detecting the shutoff detection output. 5.     A faucet system in which water supply to the faucet is controlled by the faucet control device according to any one of claims 1 to 4.