JP3436863B2 - Meter counter integration circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to a measuring instrument such as a gas meter or a water meter, which displays a measured value of a gas usage amount, a tap water usage amount, etc., by a numeral wheel of a motor-driven integrating counter. . More specifically, the present invention relates to an integrating counter control circuit that controls an integrating counter based on a count-up signal from a weighing sensor in such a weighing device.

[0002]

2. Description of the Related Art Conventionally, in a gas meter, for example, as shown in FIG. 5, a metering sensor 1 detects passage of a constant flow rate of gas and outputs a count-up signal, and the integration counter control circuit 2 outputs the signal. In response to this, the motor drive pulse generator 3 outputs a motor drive pulse, the motor drive unit 4 drives the motor 5 to send the numeral wheel of the integration counter 6, and the integration counter 6 displays the measured value in an integrated manner. is there.

[0003]

However, in the conventional gas meter of this type, the integration counter control circuit 2 is used when, for example, the microcomputer in the gas meter body runs out of control, there is a lightning strike, or a train runs nearby. There was a case where electrical noise was introduced into the output and an incorrect motor drive pulse was output and incorrect integration was performed.

Therefore, an object of the present invention is to prevent erroneous integration due to electrical noise in an integration counter control circuit that drives a motor based on a count-up signal from a weighing sensor to send a numeral wheel of an integration counter. .

[0005]

Therefore, according to the invention described in claim 1, for example, as shown in the following embodiment, the motor drive pulse is output by receiving the count-up signal from the weighing sensor 14, and the motor 16 is output. In the integration counter control circuit 10 of a measuring instrument such as a gas meter or a water meter, the next count-up signal is received before a predetermined time elapses. However, it is characterized in that the output of the motor drive pulse is stopped.

According to a second aspect of the present invention, in the integrating counter control circuit 10 of the weighing instrument according to the first aspect, a timer section 11 for measuring a lapse of a predetermined time after receiving a count-up signal is provided. When a count-up signal is received, a count-up signal determination unit 12 that determines whether or not the signal is a signal after a lapse of a predetermined time defined by the timer 11 after receiving the immediately preceding count-up signal,
The count-up signal determination unit 12 is provided with a motor drive pulse generation unit 13 that outputs a motor drive pulse based on the output signal when the count-up signal determination unit 12 determines that the signal has passed a predetermined time.

That is, in the present invention, the weighing sensor 14
However, since it outputs a count-up signal for each constant flow rate of a fluid such as gas or water, pay attention to the fact that the signal has at least a predetermined time interval, and the next count-up signal is sent before the predetermined time elapses. Do not generate motor drive pulse even if received. The predetermined time is arbitrarily set, for example, 1 second according to the measuring instrument.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a block diagram of a display circuit configuration in a gas meter including an integrating counter control circuit according to the present invention.

Reference numeral 10 in FIG. 1 denotes an integrating counter control circuit according to the present invention, which is a timer unit 11 for measuring the elapse of a predetermined time after receiving the count-up signal and a count-up signal connected to the timer unit 11. When the signal is received, the count-up signal determination unit 12 that determines whether or not the signal is a signal after a lapse of a predetermined time determined by the timer unit 11 after receiving the immediately previous count-up signal, and the count-up signal determination unit 12 And a motor drive pulse generation unit 13 that outputs a motor drive pulse based on the output signal when it is determined that the signal is after a predetermined time.

The count-up signal determination unit 12 receives a count-up signal from the weighing sensor 14 that is output each time a certain flow rate of gas has passed. On the other hand, the motor drive pulse of the motor drive pulse generation unit 13 is input to the motor drive unit 15, and the motor drive unit 15 drives the motor 16 to send the numeral wheel of the integration counter 17.

FIG. 2 shows a flow chart of the integration counter control of this gas meter. When the metering sensor 14 of this gas meter detects that a certain amount of gas has passed, the count-up signal is turned ON.

When the count-up signal is turned on as indicated by S1 in FIG. 2, it is determined in S2 whether the timer signal of the timer section 11 is ON. If it is ON, the timer section 11 is turned on in S3. Reset and turn off the timer signal. Next, the count-up signal determination signal is turned on in S4.
Then, the signal is input from the count-up signal determination unit 12 to the motor drive pulse generation unit 13 and the process returns to S1.

By the way, as can be seen from the timing chart of the integration counter control of this gas meter shown in FIG.
The timer signal of the timer unit 11 is turned on again when a predetermined time t has elapsed since the first count-up signal 1 was turned on.

Then, when the metering sensor 14 again detects that the gas has passed a constant flow rate, the count-up signal 2 is turned ON.

Therefore, the immediately preceding count-up signal 1 is O.
When a count-up signal is turned on as shown in S1 of FIG. 2 after a predetermined time t has elapsed since N, similarly, in S2, it is recognized that the timer signal of the timer unit 11 is turned on, and S3 The timer signal is turned off at, the count-up determination signal is turned on at S4, the signal is input to the motor drive pulse generator 13, and the process returns to S1.

As can be seen from the timing chart shown in FIG. 3, the timer signal of the timer section 11 is turned on again when a predetermined time t has passed since the count-up signal 2 was turned on.

Subsequently, when the metering sensor 14 detects again that the gas has passed a constant flow rate, the count-up signal 3
Similarly, every time the metering sensor 14 detects the passage of a constant flow rate of gas again after a predetermined time t has elapsed since the immediately preceding count-up signal was turned ON, Is turned on, the timer signal of the timer unit 11 is turned off, and the output signal from the count-up signal determination unit 12 is supplied to the motor drive pulse generation unit 1
Enter in 3.

Then, the motor drive pulse generator 13
Output a motor drive pulse from the motor drive unit 15 to drive the motor 16 to send the numeral wheel of the integration counter 17,
The gas consumption is cumulatively displayed on the cumulative counter 17.

Now, in the integration counter control circuit 10 according to the present invention, as shown in the timing chart of FIG.
For example, it is assumed that electrical noise enters and the count-up signal 2'is turned on again before a predetermined time t has passed since the immediately preceding count-up signal 1 was turned on.

Then, at that time, in S2 of FIG. 2, it is recognized that the timer signal of the timer unit 11 is OFF, and the count-up signal determination unit 12 does not reset the timer unit 11 without resetting. The process returns to S1 again without turning on the signal. Then, after the elapse of the predetermined time t, the timer signal is turned off and the count-up signal determination signal is turned on in the same manner as described above with the count-up signal 2 after that, and the signal is input to the motor drive pulse generation unit 13 and again. Return to S1.

Then, when the count-up signal 3 is turned on, the timer signal is turned off and the count-up signal determination signal is turned on in the same manner.

[0022]

Therefore, according to the present invention, it is noted that the count-up signal has an interval of at least a predetermined time, and even if the next count-up signal is input before the predetermined time elapses, the motor drive pulse Therefore, even if electrical noise is generated due to a microcomputer in the gas meter running out of control, a lightning strike, or a train passing by nearby, it will not be output for a predetermined period of time after the last count-up signal is input. Before the elapse, the motor drive pulse is not generated, and malfunction due to electrical noise can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a display circuit configuration in a gas meter including an integration counter control circuit according to the present invention.

FIG. 2 is a flowchart of the integration counter control.

FIG. 3 is a timing chart of the integration counter control.

FIG. 4 is a timing chart of the case where electrical noise is included.

FIG. 5 is a block diagram of a display circuit configuration of a conventional gas meter.

[Explanation of symbols]

10 Integration counter control circuit 11 Timer section 12 Count-up signal determination section 13 Motor drive pulse generator 14 Weighing sensor 15 Motor drive 16 motor 17 Integration counter

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Claims (2)

(57) [Claims] 1. An integrating counter control circuit of a weighing instrument, which receives a count-up signal from a weighing sensor, outputs a motor drive pulse, and drives a motor to send a numeral wheel of an integrating counter. The integration counter control circuit of the weighing instrument, which stops the output of the motor drive pulse even if the next count-up signal is received before a predetermined time has passed. 2. A timer unit for measuring the elapse of a predetermined time after receiving the count-up signal, and a predetermined time defined by the timer after receiving the count-up signal when the signal receives the count-up signal immediately before. A count-up signal determination unit that determines whether or not the signal has passed, and a motor drive that outputs a motor drive pulse based on the output signal when the count-up signal determination unit determines that the signal has passed a predetermined time The integrating counter control circuit for a measuring instrument according to claim 1, further comprising a pulse generator.