JPH0642994A - Appliance discrimination - Google Patents

Abstract

PURPOSE:To exactly estimate the working condition of each gas appliance even with accumulation of water on a measuring diaphragm and resulting change in measuring a flowrate by correcting stored ignition flowrate information when a change in state from non-use of gas to use of gas is estimated. CONSTITUTION:A flowrate conversion part 11 calculates flowrate from the frequency measured with a flowrate measuring means 9 using a conversion factor and stores it in a storage part 13. A change judgment part 14 compares the present flowrate with the previous flowrate in the storage part 13 and calculates the flowrate change when it is larger than a predetermined threshold. An appliance information storage means 16 stores an ignition flowrate of a gas appliance in advance. An individual flowrate estimation part 17 estimates the working conditions of each gas appliance from the flowrate change of the judgment part 14 and ignition flowrate information stored in the storage means 16. An ignition flowrate comparator 20 compares the ignition flowrate information stored in the storage means 16 with the flowrate change of the judgment part 14 and calculates a corrected ignition flowrate when use of gas is estimated by the estimation part 17 and renews the ignition flowrate in the storage means 16 with the corrected ignition flowrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors the flow rate of gas or the like built in a gas meter or the like and estimates what kind of gas appliance is currently used according to how the flow rate changes, and the gas appliance is used abnormally. The present invention relates to a device discriminating apparatus built in a gas meter, which is a so-called microcomputer meter, which shuts off gas when it is judged that the gas is being used.

[0002]

2. Description of the Related Art An example of a conventional appliance discriminating apparatus used in a membrane gas meter will be described with reference to FIG. In FIG. 2, reference numeral 1 is a disk that makes one revolution in association with one reciprocating movement of the membrane of the membrane gas meter, 2 is a plurality of magnets arranged on the outer periphery of the disk 1 at equal intervals, and 3 is near the disk 1. A magnetoresistive element 4 which is fixedly arranged and detects a change in a magnetic field and outputs a pulse signal, a first timer section 5 which measures one second from the rising portion of the pulse signal from the magnetoresistive element 3 and outputs a signal after one second, The time measurement is started by the signal from the first timer unit 4, the time (a second) until the pulse signal rising portion is input from the magnetoresistive element 3 is measured, and the start signal of the first timer unit 4 is input after the pulse signal rising portion is input. 2 is a second timer unit, 6 is a pulse counting unit that counts the number of pulses (N) output from the magnetoresistive element 3 while the first timer unit 4 is measuring one second, and 7 is a second timer unit 5. time to calculate For example, greater than 10 seconds flow rate is no flow determination unit for outputting a signal as a zero. Zero flow rate determination unit 7 is 1
The reason why the zero flow rate is determined based on 0 seconds is that the minimum flow rate of the gas appliance is 400 [kcal / h], and when this flow rate is converted to frequency, it becomes 0.1 [Hz]. Reference numeral 8 is a frequency calculation unit that calculates the frequency {(N + 1) / (1 + a)} using the information from the second timer unit 5, the pulse count unit 6, and the zero flow rate determination unit 7. Then, the flow rate measuring means 9 is composed of the disk 1 and the frequency calculating section 8. Reference numeral 10 denotes a conversion coefficient storage unit that stores a conversion coefficient for converting the frequency output from the flow rate measuring means 9 into a flow rate in liters in advance. The conversion coefficient is, for example, 0.1 [liter / pulse] in the case of the measuring means 9 which can measure a flow rate of 0.8 liter by one reciprocating movement of the metering membrane of the membrane meter and output 8 pulses in the meantime. Becomes Reference numeral 11 is a flow rate conversion unit that converts the frequency from the flow rate measurement means 9 into a flow rate in liters by the conversion factor stored in the conversion factor storage unit 10. Then, the conversion coefficient storage unit 10 and the flow rate conversion unit 1
1 constitutes the converted flow rate calculation means 12. A storage unit 13 stores the flow rate calculated by the conversion flow rate calculation unit 12, and 14
Is the difference | Q between the current flow rate calculated by the conversion flow rate calculating means 12 and the previous flow rate stored in the storage unit 13, for example, between the current flow rate value Qi and the flow rate value Qi-1 at the immediately preceding time | Q.
If i−Qi−1 | Then, the storage unit 13 and the change determination unit 14 constitute a change detection unit 15 that detects the change flow rate. Reference numeral 16 is an appliance information storage means that stores the ignition flow rate of the gas appliance in advance. Reference numeral 17 is an individual flow rate estimation unit that estimates the usage state of each gas appliance based on the change flow rate from the change detection unit 15 and ignition flow rate information from the appliance information storage unit 16, and 18 is each individual gas estimated by the individual flow rate estimation unit 17. It is an individual flow rate storage unit that stores the usage state of the device. Then, the individual flow rate estimation unit 17 and the individual flow rate storage unit 18 constitute the estimation means 19.

Next, the operation of the individual flow rate estimating unit 17 will be described. For example, regarding the usage status of the owned gas appliance, consider a case where the gas fan heater is first used at 400 [liter / h] and then the gas table is ignited at 300 [liter / h]. The individual flow rate estimation unit 17 is currently 40
The gas fan heater, which is a gas appliance in use at 0 [l / h], increases the flow rate of 300 [l / h] to 7
The possibility of changing to 00 [liter / h] and the possibility that a holding instrument which is not currently used is ignited are calculated. The possibility calculation method uses a function representing the relationship between the gas usage flow rate range of each gas appliance and the possibility of use, and the ratio of the flow rate value at ignition and the changed flow rate value stored in the appliance information storage means 16. Then, the possibility of change of each gas appliance is calculated (a specific calculation method is shown in Japanese Patent Application No. 2-240791 Gas appliance discriminating apparatus). Instrument information storage means 16
In the table, a flow rate value 300 [liter / h] at the time of ignition of the gas table is stored.
The probability that the gas table has been ignited is calculated to be 1 because it coincides with h]. Next, the probability of change is calculated for each of the other gas appliances held, and it is estimated that the change is the gas appliance with the greatest potential. In this case, it is estimated that the gas table ignition is the possibility 1.

[0004]

However, in the above-described conventional configuration, for example, the appliance information storage unit 16 stores the ignition flow rate at 400 [liters / hour] for the gas appliance 1 and 500 [liters / hour] for the gas appliance 2. Therefore, when water is accumulated in the metering film due to the moisture contained in the gas and the flow rate of only 0.6 liters can be measured in one reciprocation of the metering film, when the gas instrument 1 is ignited, the converted flow rate calculation means 12 causes 500 [liters]. / H] is calculated, and the change detecting means 15 detects a change flow rate of 500 [liter / h]. And estimation means 1
9 indicates that the ignition flow rate of the instrument 1 is 500 in the instrument information storage means 16.
Since it is stored as [liter / h] and coincides with the changed flow rate, the individual flow rate estimating unit 17 estimates that the appliance 1 is ignited, and there is a problem that the usage state of each gas appliance cannot be accurately estimated.

The present invention solves the above-mentioned problems. Even if the water contained in the gas accumulates in the measuring film and the measured flow rate in one reciprocation of the measuring film changes, the individual use of each gas appliance can be accurately performed. The first object is to provide an appliance discriminating apparatus capable of estimating the state.

A second object is to accurately estimate the usage state of each gas appliance, even if the water contained in the gas causes water to accumulate on the measuring membrane and the measured flow rate for one reciprocation of the measuring membrane changes. The purpose is to obtain flow rate information at the time of combustion of the possession equipment corresponding to the change.

[0007]

In order to achieve the above first object, the appliance discriminating apparatus of the present invention uses a flow rate measuring means for measuring the flow rate of gas and a change in the flow rate based on information from the flow rate measuring means. Change detection means for detecting and calculating a change flow rate, instrument information storage means for storing flow rate information at the time of combustion of a holding gas instrument, flow rate information at the time of ignition of the instrument stored by the instrument information storage means, and Estimating means for estimating the cause of the flow rate change from the change flow rate from the change detecting means and storing the estimation result, and the appliance information storing means when the estimating means estimates that gas has been used from a state where no gas is used. Equipped with correction means for correcting the flow rate information at the time of combustion stored in the tool information storage means from the flow rate information at the time of combustion of the used appliance stored by A.

In order to achieve the second object, according to the present invention, the difference between the change flow rate information from the change detecting means and the flow rate information at the time of burning of the appliance stored in the appliance information storing means is greater than a threshold value set in advance. If it is larger, a comparison unit that outputs a signal, a correction ignition flow rate storage unit that stores the change flow rate information from the change detection means by the signal of the comparison unit, and a correction ignition flow rate storage unit that stores the change ignition flow rate information by the signal from the comparison unit If the difference between the previous changed flow rate information and the changed flow rate information from the change detection means is smaller than a predetermined threshold value, the changed flow rate information stored in the corrected ignition flow rate storage section is stored in the appliance information storage means. The correction means is composed of a determination unit that updates the flow rate information at the time of combustion.

[0009]

According to the present invention, according to the above-mentioned configuration, when the estimating means estimates that the appliance is used from the state where no gas is used, the flow rate information at the time of combustion of the used appliance stored in the appliance information storage means and the flow rate measurement. The flow rate information at the time of combustion of the used instrument stored in the instrument information storage section is corrected by the flow rate information measured by the section.

Further, if the difference between the change flow rate information from the change detecting means and the flow rate information at the time of burning of the appliance stored in the appliance information storing means is larger than a predetermined threshold value, the comparing portion for outputting a signal to the gas Even if the water contained in the metering film accumulates due to the water content and the measured flow rate for one reciprocation of the metering film changes, the estimating means accurately estimates the usage status of each gas appliance in response to the change. The timing for obtaining the flow rate information at the time of combustion regarding the possessed appliance corresponding to the change in the measured flow rate is given, and the determination unit updates the flow rate information at the time of combustion stored in the appliance information storage means only with the change in the measured flow rate by the metering film.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals. In FIG. 1, reference numeral 1 denotes a disk that makes one revolution in association with one reciprocating movement of the membrane of the membrane gas meter, 2 denotes a plurality of magnets arranged on the outer periphery of the disc 1 at equal intervals, and 3 denotes near the disc 1. A magneto-resistive element 4 which is fixedly arranged and detects a change in the magnetic field and outputs a pulse signal. 4 is a second which measures one second from the rising portion of the pulse signal from the magneto-resistive element 3 and outputs a signal after one second
The timer unit 5 starts the time measurement with the signal from the first timer unit 4, measures the time (a second) until the pulse signal rising portion is input from the magnetoresistive element 3, and the first timer after the pulse signal rising portion is input. A second timer unit for outputting the start signal of the unit 4, and 6 for the first timer unit 4
Is a pulse counting unit that counts the number of pulses (N) output from the magnetoresistive element 3 during one second measurement, and 7 indicates that the flow rate is zero if the measurement time of the second timer unit 5 is larger than 10 seconds, for example. It is a flow rate zero determination unit that outputs a signal. The zero flow rate determination unit 7 makes a zero flow rate determination based on 10 seconds because the minimum flow rate of the gas appliance is 400 [kcal / h], and when this flow rate is converted to frequency, it becomes 0.1 [Hz]. is there. 8 is a second timer unit 5 and a pulse counting unit 6
And frequency {(N + 1)
It is a frequency calculation unit that calculates / (1 + a)}. Then, the flow rate measuring means 9 is provided from the disk 1 by the frequency calculating section 8.
Is configured. Reference numeral 10 is a conversion coefficient storage unit that presets and stores a conversion coefficient for converting the frequency measured by the flow rate measuring unit 9 into a flow rate in kcal unit, and 11 is a conversion coefficient and flow rate measurement stored in the conversion coefficient storage unit 10. It is a flow rate conversion unit that calculates the converted flow rate with the frequency from the means 9. Then, the conversion coefficient storage unit 10 and the flow rate conversion unit 11 constitute a conversion flow rate calculation means 12. 13 is a converted flow rate calculation means 12
The storage unit 14 stores the flow rate calculated by the current flow rate calculation unit 12, and the current flow rate calculated by the conversion flow rate calculation unit 12 and the previous flow rate stored in the storage unit 13, for example, the current flow rate value Qi and the previous time. If the difference | Qi-Qi-1 | with the flow rate value Qi-1 is greater than or equal to a predetermined threshold, it is determined that the flow rate has changed and the change determination unit calculates the changed flow rate. Reference numeral 16 is an appliance information storage means that stores the ignition flow rate of the gas appliance in advance. Reference numeral 17 is an individual flow rate estimation unit that estimates the usage state of each gas appliance based on the change flow rate from the change detection unit 15 and the ignition flow rate information stored in the appliance information storage unit 16, and 18 is estimated by the individual flow rate estimation unit 17. It is an individual flow rate memory | storage part which memorize | stores the use condition of each individual gas appliance. The individual flow rate estimation unit 17 and the individual flow rate storage unit 18 constitute the estimation means 19. Reference numeral 20 denotes the ignition flow rate F stored in the appliance information storage means 16 of the gas appliance in which the estimating means 19 has estimated that the gas appliance has been used from the state where the gas is not used, and the change flow rate T detected by the change detecting means 15 this time. _m
Difference (| F- _Tm |) is larger than a predetermined threshold value. Ignition flow rate comparison unit 21 indicates | F- _Tm | If it is larger, the corrected ignition flow rate storage unit that stores the current changed flow rate T _m as the corrected ignition flow rate, 22 is detected by the ignition flow rate F stored in the appliance information storage unit 16 by the ignition flow rate comparison unit 20, and the change detection unit 15. When the difference (| F−T _m |) of the current change flow rate T _m is larger than a threshold value determined in advance, the previous correction ignition flow rate T _m and the current correction ignition flow rate T _m stored in the correction ignition flow rate storage unit 22. _If the difference of ₊₁ (| T _m −T _{m + 1} |) is smaller than a predetermined threshold value, the ignition flow rate value stored in the appliance information storage means 10 is corrected ignition stored in the corrected ignition flow rate storage unit 21. Flow rate T _This is a determination unit that updates to _m . Further, the ignition flow rate comparison unit 20 to the determination unit 22 further constitute the correction unit 23.

In the above structure, the gas appliance stored in the appliance information storage means 16 used when the correcting means 23 estimates that the gas appliance is ignited from the state in which the gas is not used. Of the current ignition flow rate detected by the change detecting means 15 is compared twice, and a state in which there is a difference equal to or larger than a predetermined threshold value occurs twice in succession, and the difference between the corrected ignition flow rates calculated at that time is calculated in advance. If it is smaller than the agreed threshold value, it acts to update the ignition flow rate stored in the appliance information storage means 16, and even if the water contained in the gas accumulates in the measuring membrane and the measured value changes, the accurate value of each retained appliance can be obtained. The usage status can be estimated.

[0013]

As described above, in the appliance discriminating apparatus of the present invention, the correcting means corrects the flow rate information at the time of burning of the appliance stored in the appliance information storing means by the flow rate information detected by the change detecting means. It is possible to accurately estimate the usage status of each possessed instrument even if water accumulates on the measuring membrane of the membrane meter and the measured value changes. This has the effect of improving the performance of the safety device that safely shuts off.

Further, if the difference between the change flow rate information from the change detecting means and the flow rate information at the time of burning of the appliance stored in the appliance information storing means is larger than a predetermined threshold value, the comparing section for outputting a signal to the gas Even if the measured flow rate changes in one reciprocation of the measuring film due to the water contained in the measuring film due to the contained moisture, the estimation means corresponding to the change accurately estimates the usage status of each gas appliance. By giving the timing to obtain the flow rate information for the meter and updating the flow rate information at the time of combustion stored in the instrument information storage means only by the change in the measured flow rate by the measuring membrane, This has an effect of being able to obtain absolute flow rate information at the time of combustion of each possessed device.

[Brief description of drawings]

FIG. 1 is a block diagram of an appliance discrimination device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional appliance discrimination device.

[Explanation of symbols]

 9 flow rate measuring means 12 converted flow rate calculating means 15 change detecting means 19 estimating means 23 correcting means

Claims (2)

[Claims] 1. A flow rate measuring means for measuring the flow rate of gas, a change detecting means for detecting a change in the flow rate based on information from the flow rate measuring means and calculating a changed flow rate, and flow rate information at the time of combustion of a holding instrument. A device information storage unit for storing, an estimation unit for estimating the cause of the flow rate change from the flow rate information at the time of combustion of the device stored in the device information storage unit and the change flow rate from the change detection unit, and storing the estimation result. And when the estimating means estimates that gas is used from a state where no gas is being used, the flow rate information at the time of combustion stored in the appliance information storage means is corrected from the flow rate information measured by the flow rate measuring means. A device discriminating device comprising a correcting means. 2. A comparing section for outputting a signal if the difference between the flow rate information from the change detecting means and the flow rate information at the time of combustion of the appliance stored in the appliance information storage means is larger than a predetermined threshold value. And a corrected ignition flow rate storage unit that stores the changed flow rate information from the change detection unit according to the signal from the comparison unit, and the previous changed flow rate information stored in the corrected ignition flow rate storage unit according to the signal from the comparison unit. If the difference in the change flow rate information from the change detection means is smaller than a predetermined threshold value, the flow rate information at the time of combustion stored in the appliance information storage means is updated with the change flow rate information stored in the corrected ignition flow rate storage section. The device discriminating apparatus according to claim 1, further comprising: