JPS58179727A - Controller for fuel shut-off - Google Patents

Abstract

PURPOSE:To simplify the constitution of circuits by providing a bypass changeover section bypassing some function and changing over bypasses according to the number of the circuits of the changeover section in a device in which the abnormal outflow of a gas is detected by a fuel flow-rate signal and the supply of the gas is shut off. CONSTITUTION:A flow-rate data as a reference functioning as shut-off or the display of an alarm is registered previously to a main control section 6 consisting of a micro-computer. A flow-rate signal from a sensor input section 3 and a clock signal from a clock generating section 2 are inputted to the main control section 6, and the flow rate of fuel per unit time is measured at every arbitrary time and compared with said flow-rate data. When the flow rate measured exceeds the flow-rate data as a result of comparison, a display data is outputted to a display section while a shut-off is outputted from a shut-off section 5. A plurality of connecting wires are inputted from the bypass changeover section 7 for bypassing some function, the presence of bypasses is decided according to whether an even number or an odd number of the number (line- line) of the circuits, and a part of the function is bypassed when there are bypasses.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel cutoff control device that has a tributary flow rate sensor manual section and uses a microcomputer that drives a cutoff section based on the flow rate.

Conventionally, there have not been many fuel cutoff control devices that operate a connecting section by comparing data in a data storage section in which flow rate data is registered in advance with a measured flow rate.

This fuel cutoff control device is installed at the entrance of the gas supply path, for example, as seen in gas meters in general homes, and is designed to prevent a relatively large amount of gas from leaking, which could lead to an explosion due to the flow rate, when gas continuously flows out. If it is determined that there is, the fuel supply path is automatically shut off. In addition, by installing microcomputers in such devices and making them multifunctional, it is possible to detect more abnormal conditions (for example, open gas valves, forgetting to turn off appliances, signals from earthquake detectors, etc.) It can prevent dangers such as explosions.

For example, if a flow rate is measured in a gas supply line that exceeds the maximum flow rate that must not be exceeded under normal usage conditions as specified by the gas meter in each home, a leak may occur due to the opening of the gas valve. Or, if the cumulative time at the same flow rate exceeds the time specified by that flow rate, there is a suspicion that the appliance was forgotten to be turned off.

Such flow rate data is registered in advance in the microconbeater, and as a result of the comparison, if a flow rate exceeding the maximum passing rate is measured, for example, the fuel supply path is shut off. However, the latter case may be inconvenient for special families. - If the same appliance is used continuously during the day, it is necessary to bypass the latter function by providing a switching signal. Conventionally, as a means for inputting such a switching signal, it has been common to use a changeover switch having contacts, but this has problems with reliability such as poor contact and is expensive. If this changeover switch malfunctions and fails to bypass even though the above-mentioned gas function has been turned off, it will lead to a false shutoff. If a false shutoff occurs, the gas supply in the home will be interrupted. This causes inconveniences such as not only the shutdown but also the need for additional work to investigate the cause of the shutdown.

The present invention is intended to eliminate such drawbacks, and aims to make it possible to easily recognize the state of bypass when bypassing part of the functions of a control device, and to eliminate poor contact in the bypass circuit. be.

The main controller is equipped with a sensor human power section that inputs the flow rate data, a storage section that stores the flow rate data for the cutoff judgment, and a main control section that binoises some functions of the cutoff judgment according to the number of circuits of the connection line. This is a basic configuration, and this configuration provides a highly reliable bypass function.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a power supply unit consisting of a battery, 2 is a clock generation unit that generates a clock signal that is a reference for time counting, 3 is a sensor power unit that inputs a fuel flow signal, and 4 is a display unit that displays a plurality of different states. A display section consisting of a light-emitting diode and a liquid crystal display to indicate the cause of an abnormality; 6 a shutoff section consisting of a self-holding electromagnetic valve that shuts off the fuel supply path; 6 a main control section consisting of a microconbeater; 7 a plurality of This is a bypass switching section consisting of connecting wires.

Next, the operation based on 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 unit 6 consists of a microcomputer,
The flow rate signal from the sensor human power section 3 and the clock signal from the clock generation section 2 are input, and the fuel flow rate per unit time is measured 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 single-use conditions, as specified by the gas meter in each home in the gas supply line (exceeding this value is the gas valve). ), or if the elapsed time at the same flow rate exceeds the time specified by that flow rate, it is determined that the appliance was forgotten to be turned off, and the flow rate data should be shut off. There is. As a result of the comparison, if the measured flow rate and time exceed the above data, display data is output to the display section 4, and a cutoff output is also made to the cutoff section 6. If a small flow rate that does not pose an explosion risk is detected continuously over a long period of time, a leak from the gas piping is suspected, and display data is output to the display unit. In addition, if a plurality of connection wires (for example, a connection line consisting of six lead wires) are input from the pinox switching unit 7, and the number of circuits (number of wires) is an odd number, the above function will not be bypassed, and if it is an even number, the above function will not be bypassed.・Determine whether Kuinokusu exists.

Therefore, in the embodiment, the number of connection wires is 6, 3, and 1.
When there are books, there is no binoculars for the function, and when there are 4, 2, or 0, the function is bypassed.

In this way, various flow rate data that can be used as standards for shutoffs, alarms, etc. are registered in the main control unit, and in addition to detecting open gas valves, forgetting to turn off appliances, leaks from gas piping, etc., the bypass switching circuit It is designed to determine the presence or absence of non-nokuinokusu and to remove some of the functions. By increasing the number of bypass switching circuits (the number of circuits), it is possible to increase the number of switching operations with and without bypass.

In this way, the flow rate data that serves as the basis for shutoffs and alarms is registered in the main control unit, and in addition to detecting forgetting to turn off gas valve openers and leaks from piping, it is also possible to compare the flow rate data with these data. In addition to refraining from doing some of them,
The state of the bypass switching section can be easily determined just by the number of connection lines.

FIG. 2 shows a specific embodiment based on the block diagram of FIG. The same numbers as in FIG. 1 indicate the same contents. Reference numeral 8 denotes a crystal oscillator whose frequency is divided by a counter 19 to generate, for example, a 0.1 second clock pulse at the input terminal of the main controller 6. Reference numeral 9 denotes a reed switch for measuring the flow rate of fuel, which is installed close to a meter such that a magnet moves back and forth depending on the gas flow rate, for example, and a transistor 1o responds to the operation of the reed switch 9.

Therefore, the main control unit 6 measures the fuel flow rate per unit time at arbitrary time intervals based on the number of pulses entering the input terminal of I7 and the time of counting the clock pulses entering the input terminal. I can do it.

11 to 13 are transistors that supply current to light emitting diodes (LEDs) 14, 15 and 16 connected to each other, and these are connected to output terminals 01 and 0 of the main control unit 6.
17 is a self-holding shutoff valve 1 controlled by 2 and 03.
This transistor is used to drive 8. Connection lines 2o to 24 are respectively connected to input terminals T6 to T6 of the main control unit 60.

This connection line is made up of a jumper wire on a printed circuit board, for example. Therefore, by cutting this jumper wire, the number of circuits in the connecting wire can be changed and the bypass switching state can be changed. Therefore, the main control unit 6 can easily determine the bypass signal depending on whether the number of connected lines is odd or even.

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

By determining the number of connected wires in the bypass switching section, which is made up of multiple connection wires, and switching the bypass according to this number of circuits, it is possible to prevent poor contact at the switching section of the bypass circuit, and also to improve the bypass switching operation. The bypass state can be easily determined from the number of circuits (number of connected wires),
This can be realized with an extremely simple circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a fuel cutoff control device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific embodiment of FIG. 3...Sensor input section, 6...Blocking section, 6...Main control section, 7--Bypass switching section. Name of agent: Patent attorney Toshio Nakao and 1 other person13
figure

Claims (1)

[Claims] A sensor input section that inputs a fuel flow rate signal, a cutoff section that cuts off a fuel supply path, a bypass switching section that has a plurality of connection lines, an output/terminal that drives the cutoff section, and an input section for the sensor. , has an input terminal for inputting each signal of the bypass switching section, and a data storage section in which a plurality of flow rate data serving as a criterion for at least driving the cutoff section are registered in advance, and outputs a cutoff output to the cutoff section, and A fuel cutoff control device comprising a main control section that bypasses determination of a part of the flow rate data according to the number of circuits of connection lines of the bypass switching section.