JPS5965219A - Fuel shut-off controlling device - Google Patents

Abstract

PURPOSE:To prevent the stop of functioning of the device, by providing a voltage detecting part for a battery voltage, and providing a main control part, which stops a clock generating part during the fuel shut-off, drives the voltage detecting part when a value returning signal is imputted, and judging the signal. CONSTITUTION:When a power source 1 is turned ON, the entire control device becomes an operating state. A main control part 6 comprises a microcomputer, receives a flow rate signal from a sensor input part 3 and a clock signal from a clock generating part, and measures the flow rate of fuel per unit time from the number of flow rate signal for every arbitrary time. A reference flow rate data for warning display is registered in the microcomputer in advance, and the measured result and the flow data are compared. As the result of comparison when the measured flow rate and time exceed the maximum data, the data is outputted to a display part 4, and shut-off signal is outputted. A return input part 8 inputs the opening and closing state of a shut-off valve to the main control part 6, and controls the clock generating part 2 so that the operation is stopped when the valve is closed and the operation is performed when the valve is opened.

Description

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

Conventional Structures and Problems There have not been many fuel cutoff control devices that use batteries as a power source. In addition, in many common devices that use batteries as a power source, if the battery voltage drops, the user may be able to avoid an increase in time error, as can be seen in devices that already have a display, such as watches and calculators. It is only when you know that the battery is unable to perform calculations that you can tell that the battery voltage has dropped.

As described above, currently there is no means to reliably grasp and notify the operating state of equipment based on the battery voltage level.

The function of the fuel cutoff control device is to install it at the entrance of a gas supply line, such as the one found in gas meters in each home, and automatically shut down the supply line when it is determined that there is an abnormality based on the flow rate, such as when gas is continuously flowing out. Such equipment must maintain monitoring operations throughout the year. In addition, this type of device is installed far away (outdoors), and daily users cannot frequently check the presence of batteries when using fuel, so they have low power consumption and cannot reliably detect voltage drops. and maintain that information. In addition, in order to reduce power consumption in a shutoff device that uses a battery as a power source, a self-holding solenoid valve is used, which maintains the current state of the shutoff valve even when the battery voltage drops. . Therefore, even if the battery is low after being shut off, even if the valve is manually reset, it will appear to be operating normally, and the battery may not be replaced, which may disrupt the year-round monitoring function. .

Purpose of the Invention The present invention aims to reduce the power consumption of a fuel cutoff control device, and also to reliably detect a drop in battery voltage to prevent the device from stopping, thereby ensuring that the monitoring function can be maintained all year round. The purpose is to

Summary of the structure of the invention In order to achieve the purpose, the present invention basically includes a main control section that detects the battery voltage and drives the voltage detection section when a valve return signal is input to judge the signal from the voltage detection section. This configuration enables low power consumption and allows confirmation of the operating status of the device upon recovery.

DESCRIPTION OF EMBODIMENTS 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 clocks and lags that are the reference for time counting, 3 is a sensor power unit that inputs fuel flow signals, and 4 is a display unit that displays a plurality of different states. A display section consisting of a light emitting diode or liquid crystal display to indicate the cause of an abnormality, 6 a cutoff section consisting of a self-holding electromagnetic valve that shuts off the fuel supply path, 6 a main control section consisting of a microcomputer, and 7 a voltage detection section. 8 is a return input section.

Next, the operation of the second 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 power section 3 and the clock signal from the clock generating section are inputted, and the flow rate of 1 fuel fuel per unit time is calculated from the number of flow rate signals at every arbitrary time. The microcomputer 2 is registered in advance with flow notifications and data that serve as standards for shutting off or displaying alarms, and compares the measurement results with the diverted data.
The registered flow rate is, for example, the data on the most reliable flow rate that must not be exceeded under normal usage conditions, which is specified by the gas meter in each home in the gas supply route.
If the value exceeds this value, there is a suspicion of a leakage accident such as an open gas valve. ), or if the elapsed time for the same diversion exceeds the time specified by the flow rate, it is determined that the device was forgotten to be turned off and the device is shut off. As a result of the comparison, if the measured flow rate and time exceed the data, display data is output to the display section 4, and then a cutoff signal is output. Since the electromagnetic valve seat 1 in the cutoff section 5 is of a self-holding type, the cutoff signal only needs to be output for a predetermined period of time. The return input section 8 has, for example, a reed switch 12 operated by a magnet provided at a position linked to the mechanical operation of the shutoff valve of the shutoff section 6, and the open/closed state of this reed switch mainly controls the open/closed state of the shutoff valve. It is input to the control unit 6, and the clock generator 2 is stopped when the valve closes.

The valve is controlled so that it is in an operating state when it opens.

Therefore, when the power is cut off, the operation of the clock generator 2 is stopped, and power consumption is reduced. Furthermore, when the shutoff valve is manually returned to the open state, the clock generator 2 operates, and
The main control section 6 also receives the rhythmic signal and drives the voltage detection section 7, thereby inputting the signal from the voltage detection section and checking the presence or absence of battery voltage. It also has a repeat timer that counts the clock signal from the clock generator 2 and operates the frost and pressure detector 7 periodically (for example, every 24 hours), and also periodically checks the battery voltage. Therefore, for example, if it is necessary to drive the shutoff valve after periodically checking the battery voltage and determining that there is no abnormality in the battery voltage, and the battery voltage has dropped after the shutoff, the display unit 4 may also be driven. It is possible to reliably notify the user and prevent the battery from being used without being replaced.

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 9 denotes a crystal oscillator whose frequency is divided by a counter 11 to generate, for example, a clock pulse of 0.1 Sunagawa j to an input terminal of the main controller 6. Reference numeral 2o denotes a reed switch for measuring the flow rate of fuel, which is installed close to a part of the meter such that a magnet moves back and forth depending on the gas flow rate, and a transistor 21 responds to the operation of the reed switch 20. Therefore, the main control unit 6 can open the fuel flow rate per unit time at any given time based on the time counted by the clock pulses input to the input terminal of I2. 12 to 14 are transistors connected to light emitting diodes LED15, 16, 17 .
These are main control units o1,
02 and 03 (011). 18 is a transistor for driving the self-holding electromagnetic valve 19, and is controlled by the output terminal 04 of the main control section 6. 22 is a transistor, which is controlled by the main control section 6. It is connected to the 05 terminal of , and is periodically driven to supply the power inside the voltage detection section 7. 23 is a diode and generates the reference voltage V. 24 is the connection point of resistors 25 and 26. This is a voltage comparator that compares the voltage with the reference voltage VD and outputs the voltage comparison result to the main control section.

27 is a reed switch which is actuated by a magnet placed in a position linked to the mechanical operation of the shutoff valve, and is turned on when the valve is open, making transistor 28 conductive and also transistor 29 in clock generator 2. drive Therefore, the clock generator 2 operates. Further, when shutting off, the valve is closed and the reed switch 27 is turned off. Input terminal work for main control section 6. is )・A when the valve is shut off, and becomes low when the valve is manually returned, and is accepted as a return signal.

Advantages of the Invention As described in Section 2, the following effects can be obtained by using the fuel oil 1 cutoff control device of the present invention. In addition to operating the voltage detection section intermittently by the main control section, when the cutoff section is in the cutoff state, it is possible to stop the black/flash generation section to reduce power consumption, and also to reduce power consumption when the cutoff section is in the cutoff state. Because the battery voltage can be checked, this problem occurs due to intermittent checks and pressure checks. Battery voltage chain errors can be prevented and the year-round monitoring function of the device will not be impaired.

[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 specific circuit diagram of FIG. 1. ...Sensor power section, 4...Table 1''-1be5...Shutoff section, 6...Main control section, 7...' 1. Pressure detection section, 8..Return input section. Name of substitute person: Ben 211 Toshi Nakao, male Qj force/
Figure 1 for 1 person

Claims (1)

[Claims] A power supply section consisting of a battery, a sensor power section inputting a fuel flow rate signal, a cutoff section consisting of a self-holding electromagnetic valve that cuts off the fuel supply path, and a display section displaying a battery voltage drop.
a voltage detection unit that compares the battery voltage with a predetermined voltage and outputs a signal to the main control unit; a return input unit that provides a return signal to the main control unit when the shutoff valve is restored; and a determination as to whether or not to drive at least the cutoff unit. A data storage section in which reference flow rate data is registered in advance, an output terminal that drives each of the display section, the cutoff section, and the voltage detection section, the sensor human power section, the return input section, and the voltage detection section. A fuel cutoff control device comprising: an input terminal for inputting a signal; and a main control section that drives the voltage detection section based on the signal from the return input section and determines the input signal from the voltage detection section.