JPS6359048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fuel cutoff control device using a microcomputer with a battery as a power source.

Structure of conventional example and its problems This type of fuel cutoff control device is installed at the entrance of a gas supply path, for example, as seen in gas meters in ordinary homes, and when gas continuously flows out, the flow rate may cause an explosion accident. If it is determined that there is a relatively large amount of gas leaking, the supply path is automatically shut off. In addition, by installing a microcomputer in such a device and making it multifunctional, it will be able to detect more abnormal conditions, such as opening a gas valve, forgetting to turn off appliances, and signals from earthquake detectors. , it is possible to prevent dangers such as gas explosions, but there is an appropriate process for shutting off, for example, there is a function to judge and shut off the signal of an earthquake sensor, etc., and even if it is shut off for this reason, gas appliances, gas piping etc. Not only will extensive inspection work such as this be necessary, but focused measures cannot be taken.

Therefore, it is necessary to display many reasons for the interruption.

Further, for example, if the system has a function of determining the suspicion of a small amount of gas leaking from a gas pipe, it is not necessary to shut off the fuel, but it is necessary to issue an alarm. However, in this case, there is no problem in using the gas appliance, so there is a possibility that it will be left unattended for a relatively long period of time, and it is necessary to maintain the alarm display during that time. In this way, maintaining a large number of blockage cause indications and long-term indications, and furthermore,
The display element must be of a self-luminous type that can be seen outdoors under natural light or in the dark. Therefore, providing a large number of display elements using the usual method has the disadvantage that the battery voltage drops rapidly during display, causing the display function to disappear.

Purpose of the Invention The present invention aims to eliminate such conventional drawbacks, and to enable more reasons to be displayed with a smaller number of display devices, and to reduce power consumption. be.

Composition of the Invention In order to achieve the above object, the present invention includes a display unit that displays a plurality of states, a sensor input unit that inputs a fuel flow rate signal, a return signal input unit that receives a return signal, and a shutoff determination unit. It has a storage section that stores flow rate data for this purpose, display data corresponding to the type of flow rate data, and other alarm cause data,
The basic configuration includes a main control unit that outputs the shutdown reason preferentially to the display unit when the signal from the sensor input unit reaches the flow rate data, and this configuration temporarily displays other alarm reasons. It can be masked to

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a power supply unit consisting of a battery, 2 is a clock generator unit that generates a clock signal that is a reference for time counting, 3 is a sensor input unit that inputs a fuel flow signal, and 4 is an external device such as an earthquake sensor. An external sensor input section for inputting the sensor, 5 a return signal input section to which a return signal is input when the interrupter is reset, 6 a main control section consisting of a microcomputer, and 7 a light emitting diode that displays a plurality of different states. A display section for displaying a shut-off event or an alarm event; 8 a shut-off section consisting of a self-holding electromagnetic valve that shuts off the fuel supply path; and 9 a battery voltage check section for checking the battery voltage.

Next, the operation of the above configuration will be explained.

First, when the power supply section 1 is turned on, the entire control device becomes operational. The main control section 6 consists of a microcomputer, which inputs the flow rate signal from the sensor input section 3 and the clock signal from the clock generation section 2, and measures the fuel flow rate per unit time from the number of flow rate signals at arbitrary time intervals. . The microcomputer has registered in advance flow rate data that serves as a reference for shutting off or displaying an alarm, and compares the measurement results with the flow rate data. The registered flow rate is, for example, data on the maximum flow rate that must not be exceeded under normal usage conditions as specified by the gas meter in each home in the gas supply route (exceeding this value is when the gas valve is opened). ), or if the elapsed time at the same flow rate exceeds the time specified by that flow rate, or furthermore, flow rate data to determine that the appliance was forgotten to be turned off and shut off. There is.
As a result of the comparison, for example, if the maximum passing amount data is exceeded, the display shown in A of Fig. 3 is displayed. When the time has elapsed at the same flow rate, data is outputted to the display section 7 as shown in FIG. If a small flow rate is detected continuously over a long period of time at a level that poses no risk of explosion, there is a suspicion that there is a leak from the gas piping, so for example, the display data shown in FIG. 3 (b) is output. Further, when there is a signal from the external sensor input section 4, and the cut-off condition, for example, when the signal is continuously input for a predetermined period of time, is satisfied, the display data shown in FIG. 3C is output.

Further, if a flow rate signal is input from the sensor input section 3 even though the cutoff section 8 is driven, it is assumed that there is a leak in the cutoff section, and the display data shown in FIG. 3 (E) is outputted to the display section 7. The battery voltage check section 9 is checked periodically (for example, once every 24 hours) by the main control section 6.
times) and sends a signal representing the determination result to the main control unit 6. As a result, if the battery voltage has decreased, the main control section 6 outputs the display data shown in FIG. 3D to the display section 7. In this way, various flow rate data that serve as standards for shutoffs, alarms, etc. are registered in the main control unit 6, and it is possible to detect such things as opening gas valves, forgetting to turn off appliances, and leaking from gas piping. Display data is output depending on the type of data to notify the reason. Now, if a small amount of gas leakage and a drop in battery voltage that are not likely to lead to an explosion as shown in Fig. 3B are detected, B and D in Fig. 3 are displayed at the same time.

Note that in this case, there is no interruption, so the display is performed as a warning display. At this time, if you perform the shutoff operation shown in Figure 3 A, the displayed content will be the same as the shutoff reason in E if it is A + B + D.
According to the present invention, the alarm display is masked with priority given to the reason for the interruption, so the display content becomes the state of A. At this time, the reasons B and D are temporarily masked, and when a return signal is input to the return signal input circuit 5 at the time of the return operation of the interrupter 8, the above-mentioned interrupter reasons disappear and are temporarily masked. The masked alarm reason is displayed.

In this way, the main control unit 6 controls the opening of the gas valve,
We decided to separate the data into a group of data indicating reasons for disconnection, such as forgetting to turn off an appliance, and a group of data indicating reasons for alarm, such as a small leakage from piping or a drop in battery voltage that would not lead to an explosion, and prioritize them. Therefore, by temporarily masking one or the other, it is possible to display a large number of reasons using a small number of display elements.

FIG. 2 shows a specific embodiment based on the block diagram of FIG. The same numbers as in FIG. 1 indicate the same contents. 10 is a crystal oscillator and counter 2
The frequency is divided by 1, and is used to generate a clock pulse with a period of 0.1 seconds at the _I1 input terminal of the main controller 6, for example. Reference numeral 11 denotes a reed switch for measuring the flow rate of fuel, which is installed close to the meter such that a magnet moves back and forth depending on the gas flow rate.
Transistor 12 is responsive to the operation of reed switch 11. Therefore, the main control unit 6 calculates the fuel flow rate per unit time at any given time based on the number of pulses input to the input terminal of _I3 and the time counted by the clock pulses input to the input terminal of _I1 . can be measured. 13 to 15 are transistors that supply current to light emitting diodes (LEDs) 16, 17, and 18 connected to each one, and these are connected to the output terminals O ₁ , O ₂ , and
Controlled by _O3 . 19 is a transistor for driving the self-holding shutoff valve 20. 22 is a transistor that turns on and off in response to a signal input to an external sensor terminal 26. 2
3 is a switch for generating a return signal and is a shutoff valve 2
It is sufficient if the structure is configured so that it is turned on when returning to 0, and the I ₄ of the main control section 6 is connected via the transistor 24.
Input to input terminal. 25 is a voltage comparator.

Effects of the Invention As described above, the fuel cutoff control device of the present invention provides the following effects.

(1) By displaying only the reason for interruption during interruption, it is possible to reduce the current consumption during the display and maintain the reason for interruption for a long period of time.

(2) The number of reasons that can be displayed due to the number of display elements can be greatly increased.

(3) The reason for the shutdown becomes clear, and appropriate measures can be taken in a short period of time, allowing for more reliable maintenance.

(4) Since the number of display elements is small, it can be configured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a fuel cutoff control device showing one embodiment of the present invention, Fig. 2 is a circuit diagram showing a specific embodiment of Fig. 1, and Fig. 3 shows the operating state of the display section of the main part. FIG. 1...Power supply section, 3...Sensor input section, 5...
Return signal input section, 6... Main control section, 7... Display section, 8... Cutoff section.

Claims (1)

[Claims] 1 A flow rate measuring device and a shutoff device installed in the gas supply line and gas proper usage conditions are memorized in advance, and the usage status is determined based on the flow rate signal sent from the flow rate measuring device, and any deviation from the proper usage conditions is determined to be abnormal. and a control device that issues a closing signal to the shut-off device when the shut-off device shuts off, a display device that displays the reason when the shut-off device shuts off, and the displayed reason is divided into a shut-off reason group and an alarm reason group,
A fuel cutoff control device that displays both event groups on the display device and displays the cutoff event group with priority over the alarm event group.