JP2570333Y2 - Controller for microcomputer meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a microcomputer meter, and more particularly to a controller for a microcomputer meter for remotely controlling a return rod for returning a gas shut-off valve built in a communication type microcomputer gas meter. Things.

[0002]

2. Description of the Related Art Conventionally, a controller for a microcomputer meter of this type generally communicates with a communication-type microcomputer gas meter to display an abnormal flow rate or an abnormal notice determined by the microcomputer gas meter, and to provide a gas leak alarm. A signal from a device or the like can operate a gas shut-off valve built into the microcomputer gas meter to perform gas shut-off.

[0003] This type of microcomputer meter controller is used to construct a system as shown in FIG. In the figure, 1 is a microcomputer meter controller, 2 is a communication type microcomputer gas meter, 3a to 3d are gas leak alarms, 4 is an automatic fire extinguishing device, 5 is a gas leak display panel, and 6 is a remote switch box.

The microcomputer gas meter 2 has a return rod (FIGS. 8 and 2b) for restoring and opening the gas shut-off valve (not shown) incorporated therein when the gas shut-off valve (not shown) is shut off. A return jig 2a having a built-in motor is provided for operating the remote controller 2b by remote operation.

[0005] Each of the gas leak alarms 3a to 3d always outputs a voltage signal of 6V, but outputs a voltage signal of 12V in response to detection of gas leak, and a power outlet caused by self-harm. Is a voltage type which works so as to output a 0V voltage signal in response to the disconnection of the signal line or the disconnection of the signal line.

The microcomputer meter controller 1 is connected to the microcomputer gas meter 2 via a return signal line L1 and a communication line L2, and various display indicators 1a for monitoring various states of the microcomputer gas meter 2 indoors. In addition, a valve close switch 1b for shutting off a gas shutoff valve, a valve open switch 1 for resetting a gas shutoff valve
c and the like are provided on the panel surface.

[0007] Inside the gas leak alarm device 3
a gas shut-off valve in the microcomputer gas meter 2 by a relay unit (not shown) for outputting a gas leak signal from a to 3d to the gas leak display panel 5, a signal from the gas leak alarms 3a to 3d, and an automatic fire extinguisher 4 A communication circuit (not shown) for shutting off the gas, the gas shutoff in the microcomputer gas meter 2 according to the operation of the valve close switch 1b, the valve open switch 1c, the valve close switch 6a of the remote switch box 6, and the valve open switch 6b. Means for shutting off or returning the valve are incorporated.

[0008] As shown in FIG. 9, a return jig 2a attached to the microcomputer gas meter 2 includes a DC motor 2a-1.
And a gear 2a-2 and a return rod operating piece 2a-3 are accommodated in a case 2a-4. DC motor 2
When a + voltage is applied from the controller 1 via the return signal line L1, the a-1 rotates forward to advance the return rod operating piece 2a-3 as shown by the solid line arrow, and this return rod operating piece 2a
By pushing -3 forward, the return rod 2b of the microcomputer gas meter 2 is pushed in, and the gas shutoff valve in the microcomputer gas meter 2 is returned, that is, the valve is opened. After that, the DC motor 2a-1
Are reversed when a negative voltage is applied from the controller 1 via the return signal line L1, thereby the return operation piece 2a
-3 is retracted as shown by the dotted arrow.

The gas shut-off valve built in the microcomputer gas meter 2 is controlled by a shut-off signal sent by the controller 1 via a communication line L2 in a telegram based on signals from the gas leak alarms 3a to 3d and the automatic fire extinguisher 4. Although the valve is electrically closed, the return operation of opening the gas shut-off valve in the valve closed state is performed by pushing the return rod 2b which is always protruded. When the pressing force is released, it returns to the original protruding state. When the return rod 2b is pushed in, the gas shut-off valve is kept in the open state, and the valve cannot be closed.

With the above-described configuration, the controller 1 controls the gas shut-off valve to return, that is, open, by the internal control unit constituted by the microcomputer (CPU) operating according to the flowchart of FIG. It has become.

That is, the control section determines whether or not the valve open switch 1c or the valve open switch 6b of the remote switch box 6 is turned on by the operation in step S1, and waits until these switches are turned on. When transmitting a shutoff signal for shutting off the gas shutoff valve to the microcomputer gas meter 2, the control unit communicates with the microcomputer gas meter 2 to obtain state information (answer back) of the gas shutoff valve, Based on this, the specific indicator 1 in the display indicator 1a indicating that the gas is being cut off
a-1 is turned on, so this indicator is turned on.
It can be determined from the non-lighting whether the valve opening operation is necessary.

If the valve open switch 2c or 6b is turned on and the determination in step S1 is YES, the process proceeds to step S2, in which it is determined whether or not there is an event in which the gas shutoff valve should be shut off. If there is an event to be performed and the determination in step S2 is NO, the process returns to step S1.

On the other hand, if there is no event to be shut off and the determination in step S2 is YES, the process proceeds to step S3, where communication with the microcomputer gas meter 2 is performed again to obtain the state information (answer back) of the gas shutoff valve. Then, based on this state information, it is determined in the next step S4 whether or not the gas shut-off valve is being shut off.
Returning to step 1, if the determination is YES during the interruption, step S
Go to 5.

In step S5, the return signal line L1
To the DC motor 2a of the return jig 2.
Apply -1. Thereafter, the process proceeds to step S6 to detect the current flowing through the return signal line L1, and in the subsequent step S7, whether the return operation piece 2a-3 of the return jig 2 is locked based on the detected current and its duration. Determine whether or not.

In steps S6 and S7, the DC motor 2a-1 locks the return operation piece 2a-3 and stops moving.
Paying attention to the fact that the drive current of the DC motor 2a-1 sharply increases when the load increases, the current flowing through the return signal line L1 sharply increases, and it is detected that this state continues for a predetermined time or more. This is to detect that the return rod 2b is completely pushed in and locked.

If the determination in step S7 is NO, the process proceeds to step S8, where it is determined whether or not a predetermined time has elapsed (time over) since the output of the + voltage to the return signal line L1 in step S5. If the time has not elapsed, the process returns to step S6 and returns to step S6.
Steps S8 to S8 are repeated until either step S7 or S8 becomes YES.
When S is reached, the process proceeds to step S9.

When the determination in step S7 is YES, communication with the microcomputer gas meter 2 is performed to obtain the state information (answer back) of the gas shut-off valve to determine whether the gas shut-off valve has been opened. When it is confirmed that the gas shut-off valve is opened, the shut-off indicator 1a-1 is turned off. However, when the return operation piece 2a-3 is locked halfway for any reason and the gas shut-off valve is not opened, the shut-off indicator 1a-1 is not turned off, so that it is urged to operate the valve open switch again. be able to.

Step S8 is for exiting the flow when the return jig 2a is not locked within a predetermined time. Such a state occurs when the return signal line L1 is disconnected.

In step S9, the return signal line L1
To the DC motor 2a of the return jig 2.
Apply -1. As a result, the DC motor 2a-1 rotates in the reverse direction, and the return operation piece 2a-3 is retracted. Thereafter, the process proceeds to step S10, where the current flowing through the return signal line L1 is detected. In the following step S11, it is determined whether or not the return jig 2 is locked based on the magnitude and duration of the detected current. The above steps S10 and S11 focus on the fact that the drive current of the DC motor 2a-1 sharply increases when the load of the DC motor 2a-1 increases when the return operation piece 2a-3 locks and does not move, and the return signal Line L1
The current flowing through the return rod 2b is suddenly increased, and this state is maintained for a predetermined time or longer, and it is detected that the return rod 2b has completely returned to the projected state and locked.

When the determination in step S11 is NO, the process proceeds to step S12, in which it is determined whether a predetermined time has elapsed (time over) since the negative voltage was output to the return signal line L1 in step S9. If the time has not elapsed, the process returns to the step S10, and the steps S10 to S12 are repeated.
It waits for any one of YES to become YES, and when the determination of any step becomes YES, it proceeds to step S13.

In step S13, the return jig 2a
After completing a series of return operations, perform a return safety check,
For this reason, the microcomputer gas meter 2 determines that there is no gas flow for 2 minutes, for example, and when the gas flow is detected within this time, the gas shutoff valve is shut off and a series of operations is ended.

[0022]

In the conventional microcomputer meter controller described above, the return operation piece 2a-3 of the return jig 2a does not advance at all or attempts to advance halfway when trying to advance. If the gas lock valve is locked and the gas shut-off valve cannot be opened, the shut-off indicator 1a-1
Remains lit, it is possible to prompt the user to operate the valve open switch again. Therefore, the valve can be opened by operating the above-described return operation again by operating the valve open switch.

However, when the return operation piece 2a-3 of the return jig 2a retreats after the gas shut-off valve is opened, if the return operation piece 2a-3 cannot be retracted at all or if it is partially retracted and locked, the return operation is performed. The operation piece 2a-3 is left in the advanced state, and the return rod 2b remains pressed. For this reason,
Even if an attempt is made to shut off by the shut-off signal, a situation occurs in which the gas shut-off valve does not close, causing a very serious problem in safety.

When such a situation occurs, the valve-opening switch is operated again to try to drive the return operation piece 2a-3 forward and backward again, and the return operation piece 2a-3 stopped halfway is released. It is possible to completely retreat.

However, in the conventional controller described above, the return jig 2a is controlled by operating the valve open switch only on the premise that the gas shutoff valve is shut off. Later return operation piece 2a
-3, there is a problem that no hand can be hit when locked during the backward operation.

Therefore, in view of the above-mentioned conventional problems, the present invention is to advance the return operation piece in response to the operation of the valve opening switch and open the gas shut-off valve, and during the retreat after the gas shutoff valve is opened, the return operation piece is When the return operation piece is not completely returned to the original position after being locked, the operation for completely returning the return operation piece to the original position can be performed again to improve safety. It is an object to provide a microcomputer meter controller.

[0027]

In order to solve the above-mentioned problems, a microcomputer meter controller according to the present invention communicates with a communication-type microcomputer gas meter 2 as shown in the basic configuration diagram of FIG. It is possible to display an abnormal flow rate or an abnormal notice determined by the microcomputer gas meter 2 and to operate a gas shut-off valve built in the microcomputer gas meter 2 by a signal from a gas leak alarm device 3a to 3d. And the valve open switch 1c
The DC motor 2a-1 of the return jig 2a attached to the microcomputer gas meter 2 is rotated forward and reverse in accordance with the operation of the microcomputer gas meter 2, and the forward and reverse rotations of the DC motor 2a-1 are
The return operation piece 2a-3 is transmitted to the return operation piece 2a-3 via a-2, whereby the return operation piece 2a-3 is moved forward and backward to return the shut off gas shutoff valve to the valve open state. In the microcomputer meter controller, when the gas shut-off valve is in a closed state, the return operation piece 2a-3 of the return jig 2a is moved forward and backward according to the first operation of the valve open switch 1c. When this is done, the reverse lock detecting means 11c for detecting that the return operation piece 2a-3 is locked during the retreat, and the reverse lock detecting means 11c.
c, when it is detected that the return operation piece 2a-3 is locked during the retreat, regardless of whether the gas shut-off valve is opened or closed, the above-described operation is performed according to the operation of the valve open switch 1c again. Control means 11d for moving the return operation piece 2a-3 of the return jig 2a forward and backward is provided.

In order to solve the above-mentioned problems, the microcomputer meter controller according to the present invention is provided with the control means 1.
1d, when the retraction lock detecting means 11c detects that the return operation piece 2a-3 is locked during retreat, the return jig 2a is returned in response to the operation of the valve open switch 1c again. After the operation piece 2a-3 is retracted, the return operation piece 2a-3 of the return jig 2a is moved forward and backward.

In order to solve the above-mentioned problems, the microcomputer meter controller according to the present invention provides the valve open switch 1c when the gas shut-off valve is in a closed state.
When the return operation piece 2a-3 of the return jig 2a is advanced in response to the first operation of the above, the non-advance detection means 11e for detecting that the return operation piece 2a-3 does not advance at all is further provided. When the control means 11d detects that the return operation piece 2a-3 has not advanced at all by the non-advance detection means 11e, the control means 11d performs a retreat operation of the return operation piece 2a-3 of the return jig 2a. It is characterized in that it is not performed at all or is completed in a short time.

In order to solve the above-mentioned problem, the microcomputer meter controller according to the present invention performs the following steps when the retraction lock detecting means 11c detects that the return operation piece 2a-3 is locked during retreat. Instruction means 1 for instructing to operate the valve open switch 1c again
a.

[0031]

In the above configuration, the microcomputer meter controller communicates with the communication-type microcomputer gas meter 2 to display the abnormal flow rate and the abnormality notice determined by the microcomputer gas meter 2, and to provide a gas leak alarm. In response to signals from the devices 3a to 3d, a gas shut-off valve built in the microcomputer gas meter 2 is operated to shut off gas, and a resetting operation attached to the microcomputer gas meter 2 in response to operation of the valve open switch 1c. Rotation and forward rotation of the DC motor 2a-1 of the fixture 2a.
The forward rotation and the reverse rotation are transmitted to the return operation piece 2a-3 via the gear 2a-2, whereby the return operation piece 2a-3 is moved forward and backward, and the shut off gas shutoff valve is opened. Return to the state.

When the gas shut-off valve is in the closed state, the return operation piece 2a-3 of the return jig 2a is moved forward and backward in accordance with the first operation of the valve open switch 1c. At this time, the backward lock detecting means 11c detects that the return operation piece 2a-3 is locked during the backward movement.

When it is detected that the return operation piece 2a-3 is locked during the retreat, the control means 1
1d is the return jig 2a in response to the operation of the valve open switch 1c again regardless of whether the gas shut-off valve is open or closed.
Is moved forward and backward.

Further, when the reversing lock detecting means 11c detects that the return operation piece 2a-3 is locked during retreat, the control means 11d responds to the operation of the valve opening switch again. After the return operation piece 2a-3 of the return jig 2a is retracted, the return operation piece 2a-3 of the return jig 2a is advanced and retracted.

Further, when the gas shut-off valve is in a closed state, the return operation piece 2a-3 of the return jig 2a is advanced in accordance with the first operation of the valve open switch 1c. , The non-progression detecting means 11e is connected to the return operation piece 2a
The control means 11d does not perform the retreating operation of the return operation piece 2a-3 of the return jig 2a at all, or terminates the operation in a short time when this detection is performed.

Further, when the retraction lock detecting means 1c detects that the return operation piece is locked during the retreat, the instruction means 1a instructs to operate the valve open switch again.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a circuit diagram showing one embodiment of a microcomputer meter controller according to the present invention.
Reference numeral 11 denotes a microcomputer (CPU) constituting a control unit of the controller for the microcomputer meter, which is a ROM.
11a operates according to the control program stored in the
Various processes and controls are performed using the work area of M11b.

The CPU 11 includes a gas leak alarm via a relay unit 12, an automatic fire extinguisher and a remote switch box via an input interface 13, and a reset jig for a communication type microcomputer gas meter via a motor drive circuit 14. However, the communication-type microcomputer meter main body is connected via the communication circuit 15. The display indicator 1a, the valve close switch 1b, and the valve open switch 1c of the controller are also connected to the CPU 11.

It should be noted, in the work area in RAM11b, as shown in FIG. 3, T _L timer b1, T _S timer b
2, T _M timer b3, T _N timer b4, F1 flag b
5, F2 flag b6, F3 flag b7, F4 flag b
8, an area constituting a counter b9 and the like is secured.

With the above configuration, the microcomputer meter controller communicates with the communication-type microcomputer gas meter, and can display the abnormal flow rate and the abnormality notice determined by the microcomputer gas meter on the display indicator 1a, as well as the gas leakage. The gas shut-off valve built into the microcomputer gas meter can be operated by a signal from an alarm or the like to shut off the gas. The basic function is the same as that for the microcomputer meter described above with reference to FIG. It is the same as the controller, and differs only in the part related to the control of the return jig attached to the microcomputer meter. Therefore,
The operation of controlling the return jig will be described below with reference to the flowcharts shown in FIGS.

CPU1 of microcomputer meter controller
Reference numeral 1 denotes a control unit, which determines in step S21 whether or not the valve open switch 1c or the remote switch box valve open switch is turned on by the operation thereof, and waits until these valve open switches are turned on. Note that the CPU 1
When a shut-off command for shutting off the gas shut-off valve is transmitted to the microcomputer gas meter via a communication circuit 15 by a telegram, the microcomputer 1 communicates with the microcomputer gas meter and transmits state information (answer back) of the gas shut-off valve. Obtained and based on this, the gas shut-off indicator in the display indicator 1a is turned on. Therefore, the display indicator 1a
It is possible to judge whether the valve opening operation is necessary by the inside interruption indicator.

When the valve open switch 1c is turned on, step S2 is performed.
If the determination in step 1 is YES, the process proceeds to step S22, in which it is determined whether there is an event to shut off the gas shut-off valve, for example, an event such as gas leak. If the gas shut-off valve must not be opened, the determination in step S22 is NO, and the process returns to step S21.

On the other hand, if there is no event to be gas shut off and the determination in step S22 is YES, the process proceeds to step S23, where communication with the microcomputer gas meter is performed again via the communication circuit 15, and the state information of the gas shutoff valve ( Answerback), and based on this state information, it is determined in the next step S24 whether or not the gas shutoff valve is being shut off. When the gas shutoff valve is shut off and the determination is YES, the process proceeds to step S25, where F1 in the RAM 11b is stored.
It is determined whether any one of the flag b5 and the F4 flag b8 (described later) is “1”. If the determination in step S25 is NO, the process proceeds to step S26 to perform the return jig advance process (see FIG. 5 for details), and then to step S27.
Then, the return jig retreating process (for details, see FIG. 6) is performed. Thereafter, the process proceeds to step S28 to perform a return safety check, and then ends a series of operations.

When the determination in step S24 is NO, that is, when the gas shutoff valve is not shut off, the process proceeds to step S29, in which whether the F1 flag b5 or the F4 flag b8 (to be described later) is 1 or not. Determine whether or not. When the determination in step S29 is NO, that is, when the gas shut-off valve is opened and the return operation piece of the return jig is also normally returned to the predetermined retreat position, the process returns to step S21, and steps S21 to S24 are performed. repeat.

On the other hand, if the determination in step S29 is YES, that is, if the gas shut-off valve is open but the return operation piece of the return jig has not completely returned to the retracted position, the process proceeds to step S30. The same return jig retreating process (FIG. 6) as in step S27 is performed, and step S31 is performed.
Then, in step S31, the re-operation indicator is once turned off, and then steps S26 to S28 are executed to end a series of operations. The reason for performing the retreat process in step S30 is that the starting position of the _TL and T _S timers described later is the normal retreat position or the forward position, so the return jig 2a
This is because if the return operation piece 2a-3 stops halfway, the starting point position will be shifted if it is advanced from that location.

Next, the return jig advance processing of step S26 will be described in detail with reference to the flowchart of FIG. In this return jig advance processing, first, step S26a
In step S26b, the T _L timer b1 configured in the RAM 11b that times out at time T _L is cleared, and the T _S timer b2 that times out at time T _S is cleared in step S26b, and then the process proceeds to step S26c. Note that T _L > T _S.

In step S26c, a positive voltage is applied to the return signal line L1 via the motor drive circuit 14. This allows the DC motor in the return jig (FIGS. 9 and 2a-
1) is driven to rotate in the forward direction, whereby the return operation piece (FIG. 9,
2a-3) is advanced.

Thereafter, the flow advances to step S26d, where the current flowing from the motor drive circuit 14 to the return signal line L1 is detected, and then the flow advances to step S26e. Step S26e
In, it is determined whether or not the _TL timer b1 cleared in step S26a has timed out. If the _TL timer b1 has not timed out and the determination in step S26e is NO, step S2
The process proceeds to 6f, where it is determined based on the current detected in step S26d whether or not the lock current (current higher than a normal level and higher than a normal level) has been detected for a predetermined time T _M. For this determination, a T _M timer b3 that is cleared by the rise of the lock current is used. The predetermined time T _M is for preventing the return jig 2a from being erroneously detected as being completely pushed or returned by a temporary inrush current. In addition,
T _M <T _S.

When the determination in step S26f is NO, the process returns to step S26d, and in step S2 until the determination in step S26e or S26f becomes YES.
6d to S26f are repeatedly executed.

When the determination in step S26f is YES, the process proceeds to step S26g, in which it is determined whether an F4 flag b8 described later is 1 or not. When this determination is NO, that is, when the F4 flag b8 is 0 When there is, the process proceeds to step S26h, and when the determination is YES, that is, when the F4 flag b8 is 1, the process skips step S26h and proceeds to step S261 described later.

[0051] In the step S26h, determined T _S timer b2 has been cleared in step S26b is whether or not it is time over. This T _S timer has not timed out and the determination in step S26h is N
When the O proceeds to step S26i, here it stops the output of the + voltage between the return signal line L1 of the predetermined time T _N, the step S26 after stopping the driving of the DC motor 2a-1
Go to j. In step S26j, the RAM 11b
After the middle counter b9 is incremented, the process returns to step S26b. This predetermined time T _N is equal to T _N timer b4
It is managed by timekeeping.

The above steps S26f to S26j correspond to the gears (FIGS. 9 and 2a-2) used in a large number of return jigs to increase the driving force of the DC motor (FIGS. 9 and 2a-1).
When the meshing of the motor becomes poor, the mechanical load becomes heavy, and the lock current may be detected. To prevent this, the lock current is detected during the predetermined time T _S from the start of driving. In this case, it is provided to determine that the lock current is generated in the middle of the forward operation, to temporarily stop and then restart. The counter b9 counts the number of restarts.

If the determination in step S26h is YES, that is, if the detection of the lock current is performed after the predetermined time T _S has elapsed, it is assumed that the return jig has been completely depressed and the F2 and F3 flags are determined in step S26k. Is set to 0 before proceeding to step S261.

The determination in step S26e is YE
In the case of S, that is, the lock current is not detected at all, or the return operation piece 2a-3 does not move at all or stops even if it moves, and the lock current is not detected after a predetermined time T _S has elapsed. When the predetermined time T _L has elapsed, the process proceeds to step S26m.

In step S26m, step S26
At 26j, it is determined whether or not the count value of the counter b9 that is incremented is equal to or larger than a predetermined value X. The predetermined value X is set to T _L / (T _M + T _N ), and the count value becomes equal to X only when the return operation piece 2a-3 does not move at all, and the determination becomes YES. 3
If a little moves, the determination is NO.

When the determination in step S26m is NO, the F2 flag b6 is set to 1 in step S26n, and when the determination is YES, the F3 flag b7 is set to 1 in step S26p, and then the process proceeds to step S261. The F2 flag b6 is not perfect, but indicates that the return operation piece 2a-3 is slightly advanced and stops halfway, and the F3 flag b7 indicates that the return operation piece 2a-3 is not advanced at all. is there. The predetermined time T _L is a time provided for exiting the flow.

In step S26k, a predetermined time T
_{During N} , the output of the + voltage to the return jig is stopped, and the driving of the DC motor (FIGS. 9 and 2a-1) is stopped, thereby ending a series of operations of the return jig advance processing.

Next, the return jig retreating process of steps S27 and S30 will be described in detail with reference to the flowchart of FIG. 6. Since the processes of both steps are the same, only one of the steps, S27, will be described. .

In the return jig retreating process, first, the _TL timer b1 configured in the RAM 11b, which becomes time-over at the time T _L in step S27a, is set to the time T T which becomes time-over at the time T _S in the following step S27b.
Step S27 after clearing each of the _S timers b2
Proceed to c. In step S27c, a negative voltage is applied to the return signal line L1 via the motor drive circuit 14. This allows the DC motor in the return jig (FIGS. 9 and 2a-
1) is driven in the reverse direction, whereby the return operation piece (FIG. 9,
2a-3) is retracted.

Thereafter, the flow advances to step S27d, where the current flowing from the motor drive circuit 14 to the return signal line L1 is detected, and then the flow advances to step S27e. Step S27e
In, it is determined whether or not the _TL timer b1 has timed out. If the T _L timer b1 has not timed out and the determination in step S27e is NO, the process proceeds to step S27f, where the lock current is detected for a predetermined time T _M based on the current detected in step S27d. Is determined.

When the determination in step S27f is NO, the process returns to step S27d, and returns to step S2 until the determination in step S27e or S27f becomes YES.
7d to S27f are repeatedly executed.

When the determination in step S27f is YES, the process proceeds to step S27g, in which the F3 flag b7 (1 indicating that the return operation piece 2a-3 has not advanced at all) is 1 or not. If the determination is NO, that is, if the F3 flag b7 is 0
If the answer is YES, the process proceeds to step S27h, and the determination is YES.
In other words, when the F3 flag b7 is 1, the process skips step S27h and proceeds to step S271.

In step S27h, it is determined whether or not the T _S timer b2 cleared in step S27b has timed out. If the T _S timer has not timed out and the determination in step S27h is N
In the case of O, the process proceeds to step S27i, where the output of the negative voltage to the return signal line L1 is stopped for a predetermined time T _N , and the drive of the DC motor 2a-1 is stopped.
Go to j. In step S27j, the RAM 11b
After the middle counter b9 is incremented, the process returns to step S27b. This predetermined time T _N is equal to T _N timer b4
It is managed by timekeeping. Since the counter b9 is used in common with the counter incremented in step S26j, it is cleared at the end of step S26. However, if provided separately, both counters are cleared by the valve open switch. It may be performed during operation.

The above steps S27f to S27j correspond to the gears (FIGS. 9 and 2a-2) used in a large number of return jigs to increase the driving force of the DC motor (FIGS. 9 and 2a-1).
When the meshing of the motor becomes poor, the mechanical load becomes heavy, and the lock current may be detected. To prevent this, the lock current is detected during the predetermined time T _S from the drive start. In this case, it is provided to determine that the lock current is generated in the middle of the retreat operation, and to temporarily stop and then restart. The counter b9 counts the number of restarts.

If the determination in step S27h is YES, that is, if the detection of the lock current is performed after the predetermined time T _S has elapsed, it is assumed that the return jig has been completely depressed, and the F1 and F4 flags are determined in step S27k. Is set to 0 before proceeding to step S271.

The determination in step S27e is YE
In the case of S, that is, the lock current is not detected at all, or the return operation piece 2a-3 does not move at all or stops even if it moves, and the lock current is not detected after a predetermined time T _S has elapsed. When the predetermined time T _L has elapsed, the process proceeds to step S27m.

In step S27m, step S27
At 27j, it is determined whether or not the count value of the counter b9 that is incremented is equal to or more than a predetermined value X. The predetermined value X is set to T _L / (T _M + T _N ), and the count value becomes equal to X only when the return operation piece 2a-3 does not move at all, and the determination becomes YES. 3
If a little moves, the determination is NO.

When the determination in step S27m is NO, the F1 flag b5 is set to 1 in step S27n, and when the determination is YES, the F4 flag b8 is set to 1 in step S27p, and then the process proceeds to step S271. The F1 flag b5 is not perfect, but indicates that the return operation piece 2a-3 is slightly retracted and stops halfway, and the F4 flag b8 indicates that the return operation piece 2a-3 is not retracted at all. is there. The predetermined time T _L is a time provided for exiting the flow.

In step S271, a predetermined time T
_After stopping the output of the + voltage to the return jig during _N and stopping the driving of the DC motor (FIGS. 9 and 2a-1), step S2 is performed.
Proceed to 7q. In step S27q, F1 through F
It is determined whether or not any of the four flags b5 to b8 is 1. If the determination is YES, the re-operation indicator is turned on in step S27r, and if the determination is NO, immediately, the return jig retreating process is performed. A series of operations ends.

As is clear from the embodiments described above,
In the microcomputer meter controller according to the present invention, the return jig advance processing S26 and the return jig retreat processing S27 or S
In step S26n, S26p, when the return operation piece of the return jig does not move at all during forward and backward movements, stops halfway without fully advancing, or stops halfway without completely retracting. , S27n, S27
At p, the F1 to F4 flags are set to 1, and the re-operation indicator is turned on at step S27r.

Therefore, even when the gas shutoff valve is open and the shutoff indicator is not lit, it is possible to prompt the user to operate the valve open switch again. When the valve open switch is operated again, even if the gas shutoff valve is not shut off and the determination in step S24 is NO, step S2 is performed.
At S9, it is determined that the F1 flag b5 or the F4 flag b8 is set to 1, so that step S2
By operating the return jig retreating process at 7, it is possible to try an operation for returning the return operation piece of the return jig to the completely retracted position. This eliminates the occurrence of a situation in which the return operation piece of the return jig is not completely retracted and is left halfway, and the gas shutoff valve cannot be shut off when it should be shut off.

Step S27 of the returning jig retreating process
When the determination of g is YES and the F3 flag b7 is 1, it is determined that the return operation piece 2a-3 has not advanced at all, and the retreat operation that is useless and places a load on the return jig is omitted. If the determination in step S26g of the return jig advance processing when the valve open switch is operated again is YES and the F4 flag b8 is 1, it is determined that the return operation piece 2a-3 has not retreated at all, and it is wasteful. The forward movement operation that places a load on the return jig is omitted. That is, when the lock current between T _M is detected when the return jig advances again and when the return jig does not advance at all, the process immediately exits the flowchart regardless of the time over of T _S. It has become.

Therefore, the process proceeds to step S261 or S271 without going through step S26i or S27i, and without the DC motor of the return jig being driven for a long time, the return operation piece of the return jig is moved forward and backward. The retreat operation can be tried.

As described above, since the DC motor is not driven for a long time and the CPU is not driven for a long time, the electrical and mechanical load on the return jig is reduced, and the CPU is reduced. The effect of eliminating the restriction for a long time is obtained.

The determinations in steps S26g and S27g are made before steps S26a and S27a. If the determinations are YES, the process proceeds to step S27 without performing the forward processing step S26, and the retreat processing step S27a is performed.
Alternatively, the process may proceed to step S27q without performing steps S27l.

[0076]

As described above, according to the present invention, when the gas shut-off valve built in the communication type microcomputer gas meter is in the closed state, the return recovery is performed according to the first operation of the valve open switch. When the return operation piece of the tool is moved forward and backward, it is detected that the return operation piece is locked during the retreat, and in this case, regardless of whether the gas shut-off valve is opened or closed, the valve is re-opened. The return operation piece of the return jig is moved forward and backward in response to the opening operation, so the return operation piece is moved forward in response to the operation of the valve open switch and the gas shutoff valve is opened. When the operation piece locks and the return operation piece does not completely return to the original position, the operation for completely returning the return operation piece to the original position can be performed again, improving safety. It is planned.

Further, after the return operation piece of the return jig is retracted in response to the operation of the valve opening switch again, the return operation piece of the return jig is moved forward and backward. Even if it stops halfway, there is no hindrance to subsequent processing.

Further, when it is detected by the non-advance detection means that the return operation piece of the return jig is not advanced at all by the first operation of the valve open switch, the return operation piece of the return jig is detected. Since the retreat operation is not performed or is completed in a short time, it is possible to prevent a meaningless load from being applied to the return jig.

Further, when it is detected by the reverse lock detecting means that the return operation piece is locked during the retreat, the instruction means instructs to operate the valve open switch again, so that the necessity of re-operation is eliminated. I can surely inform you.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a microcomputer meter controller according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a microcomputer meter controller according to the present invention.

FIG. 3 is a diagram showing a work area in a RAM in FIG. 2;

FIG. 4 is a flowchart showing an outline of work performed by a CPU in FIG. 2; You.

FIG. 5 is a flowchart showing details of a part of the flowchart of FIG. 4;

FIG. 6 is a flowchart showing details of another part of the flowchart in FIG. 4;

FIG. 7 is a block diagram showing a general system to which a conventional microcomputer meter controller is applied.

8 is an enlarged perspective view showing the microcomputer meter in FIG. 7;

FIG. 9 is a partially cutaway view showing the return jig in FIG. 8 in an enlarged manner.

FIG. 10 is a flowchart showing work performed by a control unit in the microcomputer meter of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 microcomputer meter controller 1a indicating means (display indicator) 1c valve open switch 11c retraction lock detecting means (CPU) 11d control means (CPU) 11e non-detecting means (CPU) 2 communication type microcomputer gas meter 2a return jig 2a-1 DC Motor 2a-2 Gear 2a-3 Return operation piece 3a-3d Gas leak alarm

Claims (4)

(57) [Scope of request for utility model registration] 1. Communication with a communication-type microcomputer gas meter, which can display an abnormal flow rate and an abnormal notice determined by the microcomputer gas meter, and can be incorporated in the microcomputer gas meter by a signal from a gas leak alarm device or the like. The gas shutoff valve is actuated to perform gas shutoff, and in response to the operation of the valve open switch, the DC motor of the return jig attached to the microcomputer gas meter rotates forward and reverse, and rotates the DC motor forward and reverse. The reverse rotation is transmitted to the return operation piece via the gear, thereby causing the return operation piece to move forward and backward,
In the microcomputer meter controller configured to return the shut-off gas shut-off valve to the valve open state, when the gas shut-off valve is in a closed state, the first operation of the valve open switch is performed. In response, when the return operation piece of the return jig is moved forward and backward, the return operation piece detects that the return operation piece has locked in the middle of retreat, and the return operation piece is detected by the reverse lock detection means. When the lock is detected during the retreat, the return operation piece of the return jig is moved forward and backward according to the operation of the valve open switch again regardless of whether the gas shut-off valve is opened or closed. A controller for a microcomputer meter, comprising: a control unit. 2. The control means according to claim 1, wherein said reversing lock detecting means detects that said return operation piece is locked in the middle of retreat, and operates said return jig in response to an operation of a valve opening switch again. 2. The microcomputer meter controller according to claim 1, wherein after returning the return operation piece, the return operation piece of the return jig is moved forward and backward. 3. When the gas shutoff valve is in a closed state, when the return operation piece of the return jig is advanced in accordance with the first operation of the valve open switch, the return operation piece Further comprises non-advance detection means for detecting that the return jig does not advance at all. When the non-advance detection means detects that the return operation piece has not advanced at all, 3. The microcomputer meter controller according to claim 2, wherein the reversing operation of the return operation piece is not performed at all or is completed in a short time. 4. An instructing means for instructing to operate a valve opening switch again when the retraction lock detecting means detects that the return operation piece is locked during retraction. The controller for a microcomputer meter according to claim 1, wherein