JPS5969622A - Fuel cut control device - Google Patents

Abstract

PURPOSE:To make it possible to maintain a watching function all the year round without fail by a method wherein a battery voltage detecting section and a main control section for discriminating a signal from the voltage detecting section every predetermined time and every time when a fuel cut section is driven. CONSTITUTION:The main control section 6 comprises a microcomputer and measures the flow rate of a fuel every desired time by receiving a flow rate signal from a sensor input section 3 and a clock signal from a clock generating section 2. Reference flow rate data on the base of which a fuel cut or an alarm display is made are registered in the microcomputer so that the result of measurement of the flow rate data are compared with each other. Therefore, when it is found as a result of comparison that the measured flow rate and time exceed the data, display data are outputted to a display section 4 and then a fuel cut signal is generated. As an electromagnetic valve in the fuel cut section 5 is of self-retaining type, the fuel cut signal can be outputted only for a predetermined period of time. Then the voltage detecting section 7 is driven after a lapse of a fuel cut signal outputting time, to thereby check the existence of the battery voltage. Further, the clock signal from the clock generating section 2 is counted to thereby perform a periodical battery voltage check.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fuel cutoff control device using a microconbeater powered by a battery.

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 or absence of batteries when using fuel. and maintain that information. In addition, in order to reduce power consumption, a self-holding electromagnetic valve is used in a shutoff device using a battery as a power source, and the current state of the shutoff valve is maintained even when the battery voltage drops. Therefore, even when the battery is exhausted, it appears to be operating normally, but there is a risk that the battery will not be replaced, and the monitoring function will be impaired throughout the year.

Purpose of the Invention The present invention has a function of checking the battery voltage intermittently in order to reduce power consumption. This prevents the battery voltage from dropping before the voltage check, causing the control function to be lost, making it impossible to display a low battery indication, and preventing the shutoff valve from being reset until the battery is replaced. The purpose is to ensure that the monitoring function can be maintained.

Structure of the Invention To achieve the object, the basic structure includes a voltage detection section for battery voltage and a main control section that determines a signal from the voltage detection section at every predetermined time and every time the cut-off section is driven. year,
With this configuration, it is possible to check the battery voltage after large power consumption that occurs irregularly.

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

In the figure, 1 is a power supply section consisting of a battery, 2 is a clock generation section that generates a clock that is a reference for time counting, 3 is a sensor power section that inputs the fuel flow signal, and 4 is a light emitting diode that displays multiple different states. A display section consisting of (LED) or liquid crystal, etc., to display the cause of the abnormality,
Reference numeral 6 denotes a shutoff unit consisting of a self-holding electromagnetic valve that shuts off the fuel supply path, 6 a main control unit consisting of a microcomputer, and 7
is the voltage detection section.

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

First, when the power supply section 1 is turned on, the entire control device starts operating.
' Become active. The main control unit 6 is composed of a microcomputer, and inputs the flow rate signal from the sensor power unit 3 and the clock signal from the clock generation unit 2, and measures the fuel flow rate per unit time from the number of flow rate signals at arbitrary time intervals. . Flow rate data that serves as a reference for shutting off or displaying an alarm is registered in advance in the microcomputer, and the measurement results are compared 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, flow rate data can be used to determine that the appliance was forgotten to be turned off and shut off. . 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 then a cutoff signal is output. Since the solenoid valve with a cut-off part of 5 yen is a self-holding type, it is only necessary to output a cut-off signal of 6 yen for a predetermined period of time. After this cutoff output time elapses, the voltage detection unit 7
By driving υ, a signal is input to the voltage detection section 7 to check 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 voltage detector 7 periodically (for example, every 24 hours), and the battery voltage is also checked periodically. Therefore, for example, if it is necessary to drive the shutoff valve after periodically checking the battery voltage and determining that the battery voltage is good, and the battery voltage has dropped after shutting off, the display unit 4 can be driven to ensure This can 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 1o and is used to generate, for example, a clock pulse with a period of 01 seconds to the input terminal 1 of the main controller 6. Reference numeral 19 is a reed switch for measuring the fuel flow rate, which is installed close to the meter such that the magneto moves back and forth depending on the gas flow rate.
Transistor 20 is responsive to operation of reed switch 19. 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 I2 and the time of counting the clock pulses entering the input terminal of I2. can do. 11-1
Reference numeral 3 designates 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, 02, and 03 of the main control unit 6.
controlled by Reference numeral 17 denotes a transistor for driving the self-holding electromagnetic valve 18, which is controlled by the output terminal 04 of the main control section 6. Reference numeral 21 denotes a transistor, which is connected to the o5 terminal of the main control section 6 and is periodically driven to supply power to the voltage detection section T. 22 is a diode and generates a reference voltage VD. A voltage comparator 23 compares the connection point voltage of the resistors 24 and 25 with the reference voltage VD and outputs the voltage comparison result to the main control section.

In addition, in order to prevent the shutoff valve from failing to shut off, the flow rate pulse is determined even after the shutoff valve is activated, and the shutoff is performed again every time a flow rate pulse is detected. It is also possible to stop the cutoff signal and maintain the display.

Effects of the Invention As described above, the fuel cutoff control device of the present invention provides the following effects. The main control unit can operate the voltage detection unit intermittently to reduce power consumption, and
Since the battery voltage can be checked even after driving a large current load that occurs irregularly, battery voltage check errors can be prevented, the year-round monitoring function of the device will not be impaired, and safety will be improved.

[Brief explanation of the drawing]

FIG. 1 shows a fuel block diagram of an embodiment of the present invention. A block diagram of the ffI control device, FIG. 2 is a specific circuit diagram of FIG. 1. 1--Power supply unit, 3-Sensor power unit, 4-Display unit, 5-Shutoff unit, 6-Main control unit, 7--9
゛′Voltage detection section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Continuation of figure 1 page 0 Inventor: Isao Homma, Tokyo Gas Co., Ltd., 1-2-16 Yaesu, Chuo-ku, Tokyo Applicant: Tokyo Gas Co., Ltd., 1-2-16 Yaesu, Chuo-ku, Tokyo Procedural Amendment 1 Indication of the case 1986 Patent Application No. 180686 2 Name of the invention Fuel cutoff control device 3 Person making the amendment Relationship to the case Patent application
Appointment Address: 1006 Kadoma, Kadoma City, Osaka Prefecture
Name (582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita (1 other person) 4 agents 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Power of attorney within Matsushita Electric Industrial Co., Ltd. (2) Power of attorney as shown in the attached document We will replenish the information. 2. Scope of claims

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-contained solenoid valve that cuts off the fuel supply path, and a display section displaying a pressure drop on the battery.
a voltage detection section that compares the battery voltage with a predetermined voltage; a data storage section in which flow rate data that serves as a criterion for determining whether or not to drive the cutoff section is registered in advance; the display section; and the voltage detection section. , has an output terminal for driving each of the cutoff parts, and an input terminal for inputting signals from the sensor human power part and the voltage detection part, and after driving the cutoff part, drives the voltage detection part and detects the voltage. A fuel cutoff control device comprising a main control section that determines input signals from the main control section.