JPH0330780B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a remote-controlled combustion device in which the main body of a combustion equipment such as a gas boiler or an oil boiler can be operated by an operator installed at a location apart from the main body. Regarding the improvement of

<Conventional technology> In recent years, in various types of combustion equipment, the equipment body (base unit) that directly controls the combustion part, such as a boiler, is installed outdoors, and operation commands to the base unit are issued from an operation installed indoors. Remotely controlled combustion devices have been developed that can be delivered from a remote unit.

In such a case, the base unit and remote unit must be connected via an electrical data signal line and a power line, but in order to prevent an increase in the number of crossover wiring lines, the data signal is superimposed on the power line. The two-wire type is currently considered the most rational.

Typical conventional examples of such two-wire remotely controlled combustion devices are, for example, Conventional Example 1: Japanese Patent Application Laid-Open No. 120027/1983; Publication No. 60-228820; can be seen in the name "Remotely controlled combustion device".

On the other hand, however, when considering the basic operating functions that are required of the remote unit in such remotely controlled combustion equipment,
It is a command operation to start and stop combustion in the combustion section.

In other words, by operating the operation switch by the user,
Start combustion in a combustion section installed outdoors,
The ability to stop combustion in a burning combustion section is the minimum necessary basic operating function for this type of remote-controlled combustion device, regardless of manufacturer or model.

As will become clear from the purpose of the present invention, which will be described later, what we would like to focus on in this book regarding these conventional examples is what type of operation switch is used, how it is operated, and what kind of signal is sent to the combustion section. Questions include whether a combustion command or a fire extinguishing command can be given, and how stable it is when the operation switch is turned on and when it is not.

However, although it has been recognized that the operation switch itself is fundamentally necessary as described above, no in-depth consideration has been given to the various points mentioned above.

For example, in Conventional Example 1, a switch is simply inserted to open and close the power supply line, and this obviously must be an alternate type electric switch.

In other words, when the user attempts to start combustion of the equipment from the remote unit side, he/she switches the switch to the on position, and the switch contact steadily closes the power supply line to start combustion. Even after various electrical mechanisms occur and ignition occurs, combustion continues as long as the switch contact remains in the closed state.

Therefore, in order to extinguish a burning combustion part, the operating switch is placed in the stop position to open the alternate switch contact from the previously closed state and open the power supply line.

On the other hand, in Conventional Example 2, it is not disclosed what type of operation switch is used.

As is well known, there are two types of electric switches of this type in terms of operating mechanism.One is the above-mentioned alternate type, which toggles the contact position each time it is operated, and when the contact is placed in the closed position. , the contact will remain closed even if you remove your hand from the operation, and if you put it in the open position, the contact will remain open even if you release your hand from the operation, but other One type is called a momentary type, in which the contacts are placed in a different state only when an artificial operating force is applied, such as when the user is pressing the switch.

However, in Conventional Example 2, it seems as if either an alternate type or a momentary type operation switch can be used in principle, but as mentioned above, there are practical problems with Conventional Example 2. , there is nothing disclosed about the operation switch, and if it is an alternate type that selectively keeps the power line closed or open, then this operation switch will be substantially the same as Conventional Example 1, and it will not be momentary. If a type operating switch were to be used, some type of circuit would be required to change the state of the system each time the switch was operated. However, even if one can imagine that it is necessary, the details are unclear as there is no specific disclosure.

<Problems to be Solved by the Invention> It has already been mentioned that in Conventional Example 1, the operation switch is limited to the alternate type, but in Conventional Example 2, the product embodying the configuration similarly has the alternative type operation. If a switch is to be used, the following drawbacks common to conventional examples 1 and 2 arise.

One of the demands from customers these days is the ability to have multiple remote units. In other words, there is a desire to control the base unit from any of a plurality of remote units installed at arbitrary locations indoors.

However, if an alternate type operation switch is used, even if one remote unit wants to stop combustion in the combustion section via the base unit, the operation switch of another remote unit may be set to the closed state (combustion state). If it were, it would be impossible. In order to stop combustion, the operation switches of all remote units must be turned off. This is actually an unrealistic requirement for users.

On the other hand, if it is possible to use a momentary operation switch in a remote-controlled combustion device like Conventional Example 2, how can combustion start and stop be determined by operating the momentary switch? It becomes necessary to disclose such circuits, but as mentioned earlier, there is no disclosure of this at all, so I have to say that the current situation is such that I look forward to future development.

However, the drawing attached to the publication of Conventional Example 2 shows a reset switch (hereinafter referred to as an emergency switch) as a switch that is provided in the remote unit and is completely separate from the operation switch. From the explanation regarding this,
The emergency switch is constructed such that it may be of a momentary type.

However, this is a dedicated switch that is independent of the operation switch, and is not used all the time.As a result of an abnormality occurring in the microcomputer built in the base unit due to runaway, etc., the microcomputer built in the remote unit This is provided so that even if communication with the computer becomes impossible, the microcomputer built into the base unit can be reset by operation from the remote unit. When this emergency switch is operated, the remote unit An overcurrent is generated from the built-in overcurrent generation circuit, and this is detected by the detection circuit provided on the base unit side via two-wire cross wiring, causing the microcomputer built in the base unit to is reset, or the power supply from the base unit's built-in power supply circuit to the remote unit is cut off. Naturally, such an emergency switch does not have the function of an operating switch, so it cannot command the start or stop of combustion under normal conditions.

Moreover, in this second conventional example, it is necessary to consider that another problem arises. In other words, as mentioned above, in this conventional example 2, only in an emergency, the microcomputer built in the base unit is reset by intentional operation of the emergency switch. There is no need to operate the emergency switch unless there is an abnormality in the microcomputer. Therefore, even when combustion is stopped, the microcomputer built into the remote unit and the microcomputer built into the base unit are able to communicate with each other via the two-wire data transmission line.

As a result, although Conventional Example 2 provides a safety circuit, it contains quite dangerous elements.

After all, if noise gets on the two-wire data transmission line when combustion is stopped, it is very likely that the microcomputer built into the base unit will malfunction, and the probability of an accident resulting in the microcomputer running out of control is also increased. This is because there is no difference from combustion.

When combustion is stopped, fuel such as raw gas must be stopped without fail, but such noise could cause the microcomputer to malfunction, causing even the worst accident of fuel leakage. , is a serious problem. No matter how many emergency switches are installed, there is no point in having them unless the user is aware of the fact of an accident and does not operate them.

The present invention has been made in view of the current state of the prior art, and first of all, when at least two or more remote units are each provided with an operation switch, all of the operation switches can be of the momentary type. In order to make it possible for any remote unit to command the start and stop of combustion without being affected by other remote units, and to ensure the safe operation of this type of device that handles the mechanism of combustion, the operation switch and provides a remote-controlled combustion device that does not require a separate emergency switch or reset switch and takes sufficient consideration to reset the microcomputer by reasonable means, and further,
The present invention aims to disclose a configuration that can reliably prevent fuel leakage accidents by using a circuit that is separate and independent from the microcomputer when combustion is stopped in such a remotely controlled combustion device.

Of course, the main meaning of using a momentary switch is that when multiple remote units are used, each remote unit can control the base unit without being affected by the other remote units. In particular, it is possible to control the start and stop of combustion, and by using a circuit that is separate and independent from the microcomputer,
The main meaning of keeping the fuel valve closed during the combustion shutdown to prevent leakage of raw fuel is that even if the microcomputer is alive during the combustion shutdown, the erroneous fuel valve control signal The aim is to nullify this false signal and prevent the worst-case accident of raw fuel leaking.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides power to a base unit that directly controls combustion equipment and two or more remote units that operate the base unit from a remote location. The base unit and remote unit are connected by a two-wire data transmission line that also serves as a railway line, and each unit has a built-in microcomputer to create and send/receive various data for combustion control to be carried on the data transmission line. It must be an operable combustion device; in addition to satisfying the prerequisite configuration requirements, it must also be equipped with a momentary operation switch that changes its output state only when the remote unit is equipped with it and operated by the user; A mode signal output circuit that differentially indicates the on mode when the combustion equipment is in the combustion state and the off mode when it is in the rest state; What is the microcomputer provided in the remote unit and built in the remote unit? It is a separate hardware circuit, and if the operation switch is operated while the mode signal described above indicates the off mode, it emits an on mode instruction signal in a form different from the various data for combustion control, A mode designation circuit that outputs an off mode instruction signal in a form different from the on mode instruction signal when the operation switch is operated when the mode signal indicates the on mode; It is a hardware circuit separate from the microcomputer, and when it differentially detects the off mode instruction signal sent via the two-wire data transmission line, it gives a forced off mode signal to the microcomputer built in the base unit. A mode instruction signal detection circuit that moves the combustion stop function when the on-mode instruction signal is detected differentially, resets the microcomputer built in the base unit, and then moves the combustion start function; The forced off mode signal output from the circuit forcibly stops the function of the combustion valve drive circuit to maintain the fuel valve in a closed state, and the reset signal output from the mode instruction signal detection circuit allows the fuel valve drive circuit to operate. This paper proposes a remotely controlled combustion device with a safety circuit.

<Operations and Effects> In the case of the remote-controlled combustion device according to the configuration of the present invention, a mode signal representing the state of the combustion equipment is always outputted from the mode signal output circuit.

Of course, this mode signal may be extracted from a separately provided hardware circuit, but
Even if this is not done, it can be extracted as a signal from the microcomputer.

The mode designation circuit, which is a hardware circuit provided in the remote unit and separate from the microcomputer built into the remote unit, is
Since such a mode signal is received, it is possible to know whether the combustion equipment is currently burning or not.

In this way, if the current state of the combustion equipment is input to the mode designation circuit, when operating the operating switch as a momentary switch, the momentary switch will output a signal of the same form every time it is operated. (For example, the signal line is closed only when the operation switch is operated.) However, the mode designation circuit can easily determine which mode should be outputted each time the operation switch is operated. The circuit that realizes this is also extremely simple, although it is a matter of design by those skilled in the art.

For example, when the mode signal indicates the off mode, the combustion equipment is in a dormant state, so if the operation switch is operated at this time, it is a command by the user to start the combustion equipment. Therefore, the mode designation circuit only needs to output a mode designation signal that designates the on mode.
Conversely, if the operation switch is operated while the mode signal indicates the on mode, it can be determined that the user has requested to stop the combustion equipment.
Therefore, the mode designation circuit only needs to output a mode designation signal that designates the off mode.

The on-mode instruction signal and off-mode instruction signal may be defined as signals with specific distinguishable binary codes, but they can also be simply configured as signals with different pulse widths.

On the other hand, at least the base unit is provided with a detection circuit that detects the mode instruction signal as a hardware circuit separate from the microcomputer built into the base unit, and this mode instruction signal detection circuit detects the ON mode instruction signal. When this is detected, the microcomputer built into the corresponding base unit is reset, and then the function for starting combustion can be activated. When the off mode instruction signal is detected, the forced off mode signal is activated to stop combustion. functions can be activated. Particularly, as mentioned above, if the mode signal is marked as an on-mode instruction signal or an off-mode instruction signal depending on its pulse width, this mode instruction signal detection circuit detects the pulse of the corresponding pulse. It can be easily configured as a width monitoring circuit.

With this type of action, even though a momentary switch is used as the operation switch, no matter how many remote units are added, the problem like the conventional one does not occur, and commands can be operated only from one remote unit. Commands can be given to stop and start combustion.

For example, even if combustion is started by operating the operation switch of a remote unit, combustion can be stopped by operating the operation switch of that remote unit again, or by operating the operation switch of another remote unit. Yes, in that case you do not have to operate the remote unit that started the combustion.

As is clear from the above structure and operation, the momentary switch referred to in the present invention does not only refer to the structure of a switch as a mechanical component, but also has an equivalent output signal similar to that of a momentary switch. In a broad sense, it includes those equipped with an appropriate electric circuit system to output the output. For example, even if the structure is an alternate type as described in line with the conventional example, if it is attached to one position, it will output an electrical signal in a different state for a set period of time from that moment onwards. Similarly, when the switch is placed in the other position, it may be a switch circuit that outputs an electrical signal in a different state only for a predetermined period of time, or it may be a momentary switch circuit. Even if type switches are used, a total of one pair may be used, one each for the combustion start command and one for the combustion stop command.

Also, as mentioned above, before starting combustion, the microcomputer built into the base unit is reset once.
There is no need to provide a special reset switch or emergency switch, and excellent results can be obtained in terms of safety.Furthermore, the on mode and off mode can be specified using a hardware circuit separate from the microcomputer. By doing so, reliability can be improved compared to when only a microcomputer judges all signal systems.

One manifestation of this is, for example, that in the off mode, the microcomputer can be in a state where the data transmission line is reliably stopped by the command of the forced off mode signal. The data normally transferred at this time should originally be only the on mode instruction signal sent from the remote unit to start combustion, but on the other hand, the circuit that detects this on mode instruction signal is a microcomputer. This is because it is a separate and independent hardware circuit.

For these reasons, if the microcomputer is left unrelated to the data transmission line when the combustion equipment is stopped, even if some noise signal or other signal is superimposed on the data transmission line when the combustion equipment is stopped, There is no possibility that this information will be input incorrectly into the microcomputer and combustion will start unexpectedly, thereby preventing danger.

In addition, the safety circuit of the present invention ensures almost complete safety against the problem of raw fuel leakage, which is the most serious cause of accidents.

In other words, this safety circuit can be configured as a hardware circuit that is separate and independent from the microcomputer, but when the mode instruction signal detection circuit issues a forced off mode signal, the circuit that drives the fuel valve is forcibly stopped. Therefore, even if the microcomputer is working during fuel stop and an erroneous signal is given to this fuel valve drive circuit due to an unforeseen cause such as a runaway accident, the fuel valve will not be activated by mistake. Risks of opening can be prevented.

In other words, this means that even when combustion is at a standstill, the microcomputer can be used to process signals related to, for example, a heating circuit to prevent freezing in the winter, or, alternatively, Contrary to the above, in some cases, even if a system is constructed that transmits some data via a data transmission line even during combustion cessation, the worst accident, fuel leakage, may occur. This also means that sufficient safety can be obtained.

There are various ways in which the safety circuit can force the fuel valve drive circuit to stop.
The simplest yet most reliable method is to cut off the power supply to the fuel valve drive circuit when the forced off mode signal is issued.

In a normal circuit arrangement of this type, the combustion flow path is opened only when the fuel valve drive circuit supplies a solenoid valve opening current to the solenoid of the solenoid valve; otherwise, the solenoid is supplied with current. When the fuel is not being supplied, the spring mechanism in the solenoid valve automatically closes the valve, so if you cut off the power supply to the fuel valve drive circuit in the first place, you can This is because there is no fear that current will be applied to the electromagnetic valve drive solenoid.

<Embodiment> FIG. 1 shows a schematic circuit diagram of a preferred embodiment of a remotely controlled combustion apparatus constructed according to the present invention.

First, for convenience, we will explain the circuits that have been provided in the past.
Microcomputers 11, 21 and transmitting circuits 12, 2 are also used in the remote unit 20.
2, receiving circuits 13, 23, and power supply circuits 14, 24, the power supply circuit 14 of the base unit is connected to the commercial power supply G, and the drive circuit 17 of the solenoid valve that generally opens the fuel valve only when current is applied. is controlled by a control signal S8 from the microcomputer 11, and opens and closes the solenoid valve in accordance with the control signal.

Various data necessary for controlling combustion equipment are
A two-wire power supply/data transmission line 30 (hereinafter simply referred to as data transmission line 30) which also serves as a power supply line is superimposed from each microcomputer 11, 21 via respective transmission circuits 13, 23, and from the base unit to a remote unit. The signals are sent from the remote unit to the base unit, decoded by the corresponding receiving circuits 23 and 13, and input to the own microcomputers 21 and 11.

Furthermore, each receiving circuit can also monitor the transmission data output from its own unit.

Normal combustion control is performed by such a circuit system, but since the present invention does not directly specify its specific form, further detailed explanation will be omitted.

The configurations added to such a combustion apparatus according to the present invention are a mode instruction signal detection circuit 15 and a safety circuit 16 in the base unit 10, and a mode instruction signal detection circuit 25, a mode designation circuit 26, and an operation control circuit in the remote unit 20. Switch 2 identified as a momentary type switch
It is 7. However, as described in the section on operation, the momentary type operating switch 27 may be any equivalent as long as it is equivalent to a momentary type.

In other words, even if it has an operation knob that is structurally similar to an alternate type, when it is placed in one position, it outputs an electrical signal in a different state for a predetermined amount of time from that moment onwards. However, similarly, a switch circuit or the like may be used that can output an electrical signal in a different state from that time only for a predetermined period of time when it is attached to the other position.

Therefore, in such a case, even though the shape is the same as a conventional alternate type switch, the combustion position and rest position are clearly separated, whereas in the past there is no such definition. Every time it is tilted from its current position to the other position, combustion starts and stops alternately.

In addition, in the illustrated case, a plurality of remote units 20 are shown, but each may have the same configuration, so the intermediate units from the second remote unit 20-2 to the n-th remote unit 20-n are omitted. The internal circuit configuration of only the first remote unit 20 is shown only by being surrounded by an imaginary line frame.

Hereinafter, the operation of this embodiment will be explained using such a schematic circuit configuration, that is, in conjunction with a more specific example of a signal format.

First, an operating switch 27 provided in the remote unit 20 and used by the user to command the start and stop of combustion in the combustion equipment is, in this embodiment, a conventional mechanical momentary switch 27 in a narrow sense. In such a case, as shown in the first row of Fig. 2, the state will only occur when the user is operating the switch by pushing the operating knob, etc.
The situation will be different from before.

In the figure, the state indicated as "operation" corresponds to logic "1" as the output state of the switch signal S1, and the output state indicated as "non-operation" corresponds to logic "0". However, from the circuit example shown in Figure 1, "operation"
corresponds to the case where the signal line including the switch contact is closed by the contact 27 shown, and is "non-operated".
corresponds to when you release your hand and open it.

On the other hand, a microcomputer 21 built into the remote unit 20 outputs a mode signal S2 representing the current state of the combustion equipment.
The mode signal S2 is an on mode signal S2on when combustion is in progress, and an off mode signal S2on when at rest.
2off, but in reality, these can be expressed reciprocally using a binary relationship of signal levels.

In this embodiment, as shown in the second row of FIG. 2, when the combustion equipment is at rest, the off mode signal S2off of logic "0" or logic "L" is output from the microcomputer 21. ,
During combustion, an on-mode signal S2on of logic "1" or logic "H" is output.

Therefore, in this embodiment, the microcomputer 21 built in the remote unit serves as the mode signal output circuit in the summary structure.

The mode signal S2 is input to the mode designation circuit 26, and the mode designation circuit 26 receives the mode signal S2.
When the operation switch 27 is operated when 2 is the off mode signal S2off, the on mode instruction signal S3on of the first pulse width T1 is generated as shown in the third row of FIG. If the exercise switch 27 is operated while inputting,
An off-mode instruction signal S3off with a second pulse width T2 shorter than the pulse width T1 is output, and these on-mode instruction signals S3on and off-mode instruction signals S3off are transmitted via a data transmission line through a transmitting circuit 22 built in each remote unit. It will be posted on the 30th.

A mode instruction signal detection circuit 15 built in each of the base unit 10 and the remote unit 20,
25 receives the received signal S4 from the receiving circuits 13 and 23 which receive the signal on the data transmission line 30, respectively. In Figure 3, the remote unit 20
The received signal S4 related to the base unit 10 and the received signal S4 related to the base unit 10 are both shown, and as indicated by the same reference numerals, they have the same waveforms unless transfer distortion is considered.

In addition to the above-mentioned on mode instruction signal S3on and off mode instruction signal S3off, the received signal S4 includes various data signals Sd necessary for normal combustion control as before, and these data signals Sd are transmitted in one packet. The time T3 required for this is set at a certain design value.

The pulse width T2 defined in the off-mode instruction signal S3off mentioned above is set longer than this one packet transfer time T3, and therefore the pulse width T1 defined in the on-mode instruction signal S3on is as follows.
It is set even longer than these.

However, mode instruction signal detection circuits 15 and 25
When a signal that continues to be logic "1" for a time t1 longer than the one-packet transfer time T3 of the normal data signal Sd included in the received signal S4 is detected, a forced off mode signal S5 is output.

Therefore, in the case of this embodiment, the signals that continue to be logic "1" for a time t1 longer than the one packet transfer time T3 mentioned above are the off mode instruction signal S3off with a pulse width T2 and the on mode instruction signal S3on with a pulse width T1. This corresponds to both. In other words, in this embodiment, the off mode instruction signal S3
Even when the on mode instruction signal S3 is on instead of off, the forced off mode signal S5 is once output. However, it will be understood from what will be described later that this does not cause any problems. What I would like to confirm here is that in this embodiment, even if the pulse width T2 of the off mode instruction signal S3off, which has a relatively short pulse width, the mode instruction signal detection circuits 15 and 25 output the forced off mode signal S5. This means that the time is set longer than the time t1, which is sufficient for making a determination.

The mode instruction signal detection circuits 15 and 25 further detect that the on mode instruction signal S is longer than the pulse width T2 set in the off mode instruction signal S3off.
When a signal that continues to be logic "1" for a time t2 that is equal to or actually slightly shorter than the pulse width T1 set to 3on is detected, a reset signal S6 is output. In this embodiment, the input signal at this time cannot be any other than the on mode instruction signal S3on.

However, when the forced off mode signal S5 is output from the mode instruction signal detection circuit 15, the microcomputer 11 built into the base unit 10 operates the function related to combustion stop and then enters a dormant state, and preferably from then on. Stop the transfer operation. Further, in this embodiment, the microcomputer 21 built in the remote unit is also connected to the mode instruction signal detection circuit 25 built in the remote unit.
The forced off mode signal S5 outputted by the controller enters a dormant state and stops the transfer operation.

However, in the configuration of the gist of the present invention, the microcomputer within the base unit 10 may be the only microcomputer that is affected by the mode instruction signal detection circuit, including the reset operation described later. At the very least, it is the microcomputer built into this base unit that directly controls fuel distribution and combustion, which tend to have serious consequences when an accident occurs.

In parallel with this operation, a forced off mode signal S5 is generated from the mode instruction signal detection circuit 15.
is given to the safety circuit 16, and the safety circuit 16
A closure signal S7 is output from the fuel valve drive circuit 17 to instruct the fuel valve drive circuit 17 to maintain the valve in the closed state. In the illustrated embodiment, as shown in FIG. 2, this signal S7 is shown as logic "0" and significant, but it is actually a power cutoff signal for cutting off the power supply to the fuel valve drive circuit 17. It is desirable that there be.

This is because fuel valves used in this type of combustion equipment usually open the valve only when a valve opening current is applied to the solenoid, and otherwise close the valve using a built-in spring mechanism. Since what is maintained is normal, the occlusion signal S
7, if the power supply itself of the fuel valve drive circuit 17, which is a supply circuit that selectively supplies current to the fuel valve (electromagnetic valve), is cut off, it will be possible to prevent current from being supplied to the solenoid. Because it is completely avoidable.

However, this is not limiting, and various other methods can be considered, such as fixing the input of a certain transistor in the fuel valve drive circuit to a certain specific value.

On the other hand, when the reset signal S6 is issued from the mode instruction signal detection circuits 15 and 25, the microcomputers 11 and 21 built into the base unit 10 and remote unit 20 are reset, and restarted at the falling edge of the reset signal. The fuel starts the fuel, and after ignition, performs the function of continuing combustion.

At this time, of course, by receiving the reset signal S6 in the base unit, the safety circuit 16 generates a signal that allows normal operation of the fuel valve drive circuit 17, in this case, a blockage signal S7.
It outputs a signal "1" which is an inversion of the significant logical value "0".

Because of these signal relationships, the operation of the device of this embodiment can be explained as follows over time.

First, for convenience, a case will be described in which a user performs an operation to stop combustion while the combustion equipment is in a burning state, as shown in the right half of FIG. 2.

When combustion continues, the microcomputer 11 built in the base unit 10 and the microcomputer 2 built in the remote unit 20 are activated.
1 and the data signals Sd are alternately transferred to each other.
Particularly, when a plurality of remote units (n units) are provided, the microcomputer 11 built in the base unit 10 generally scans each remote unit in order to transfer data. However, such matters are not directly stipulated by the present invention.

While combustion is continuing, due to the time-related agreement mentioned above, no signal that continues to be logic "1" for more than one packet transfer time T3 occurs in the received signal S4 appearing at the output of each receiving circuit 13, 23. Of course,
Mode instruction signal detection circuits 15 and 25 do not output any significant signals. In this state, the mode specifying circuit 26 is continuously supplied with the on-mode signal S2on, which is logic "1" and significant.

Here, the user switches the momentary operation switch 27.
When you press or otherwise operate, the logic "1" is displayed as shown in Figure 2 only at the moment when you do not release your hand.
A signal representing this is obtained as the switch signal S1.

When this is given to the mode designation circuit 26, an off mode designation signal S3 with a pulse width T2 is generated.
off is output, and this is superimposed on the data transmission line 30 via the transmission circuit 22.

There are various known methods for superimposing this signal on the power supply potential applied to the data transmission line 30, but as with the normal data signal Sd, the pulse of each signal The most common, simple, and reliable method is to superimpose an oscillation frequency from an oscillation circuit of a predetermined frequency on a DC potential for a time corresponding to the width (modulation method). However, there is also a method to disconnect the power line itself. In either case, each unit has a built-in power supply circuit 14, 16.
By incorporating a low-pass filter or an integrating circuit system therein, ripples caused by such signal components can be removed.

However, when the off mode instruction signal S3off sent via the data transmission line 30 is detected by the mode instruction signal detection circuit 15 via the reception circuit 13 built into the base unit 10, it is determined that time t1 has elapsed since the input. After that, as shown in the right half of FIG. 2, a forced off mode signal S5 is output, and in response to this, the microcomputer 11 performs a combustion stop operation, and after stopping, Preferably, the transfer operation is suspended.

At the same time, the safety circuit 16 that receives the forced off mode signal S5 sets the blockage signal S7 to a significant logical value "0".
Even if an erroneous control signal S8' is given from the microcomputer 11 to prompt the opening of the fuel valve by mistake as shown in FIG. As shown,
Keep the fuel valve closed.

Furthermore, in the case of this embodiment, as a desirable consideration, a mode instruction signal detection circuit 25 is also provided within the remote unit 20, and on the other hand, the signal output from its own transmitting circuit 13 is also monitored by its own receiving circuit 23. Therefore, upon detection of the off mode instruction signal S3off, its own microcomputer 21 is also put into a hibernation state.

When the combustion equipment is in a state in which combustion is suspended in this way, as shown in the left half of FIG. The mode signal S2 of is the off mode signal S
2off and is applied to the mode designation circuit 26.

The next time the user momentarily operates the operating switch 27, this is a command to start combustion.

In such a case, the switch signal S1 causes
The mode designation circuit 26 outputs an on mode designation signal S3on with a pulse width T1, which is transmitted to the data transmission line 30 via the transmission circuit 23.

At this time, the microcomputer 11 built in the base unit is in a suspended state regarding data transfer as described above, but the mode instruction signal detection circuit 1
5 is assembled as a hardware circuit separate and independent from this microcomputer 11, and is always in an "alive" state.
on is detected.

However, the above first and second pulse widths T1 and T2
From the relationship, looking at the passage of time from the moment when the on mode instruction signal S3on is input, the forced off mode signal S5' in the left half of FIG. 2 is output at the time t1 elapses. It ends up.

However, under this state, since the microcomputer 11 is originally in off mode, no particular problem occurs. Furthermore, even if some kind of response occurs in the circuit actually assembled due to the circumstances of the circuit, after the time t
2, as shown in the left half of FIG. 2, the reset signal S6 is immediately output, so this forced off mode signal S5' is ignored as a result. , and no problem occurs. This also applies to the safety circuit 16.

Conversely, for this reason, in this embodiment, the simplest means of indicating the difference between the on and off mode instruction signals is the difference in pulse width.

When the reset signal S6 is output from the mode instruction signal detection circuit 15, the microcomputer 11 built in the base unit 10 is reset, and the microcomputer 11 starts at the fall of the reset signal S6 and starts combustion. After combustion, it performs the data transfer operations necessary to continue combustion.

At the same time, on the other hand, the safety circuit 16 outputs the blocking signal S7 to a non-significant logical value "1".
At this time, the fuel valve drive circuit 17 is enabled to operate.

Therefore, after that, microcomputer 1
1 outputs a control signal S8 to open the fuel valve, the fuel valve drive circuit 17 can open the fuel valve in response, as shown in FIG.

On the other hand, in this embodiment, the mode instruction signal detection circuit 25 detects the on mode instruction signal S3on via the receiving circuit 23 in the remote unit and generates a reset pulse, and similarly the microcomputer 21 built in the remote unit is activated. Reset.

The operation of the illustrated embodiment circuit has been explained above, and the mode signal S2 representing the current state of the combustion equipment is
The mode signal output circuit that outputs the
It may be assembled as a separate hardware circuit. In such a case, the method of detecting whether the device is currently in the on mode or the off mode can be any of various methods. For example, it is possible to detect whether there is a logic inversion within one packet of the data signal Sd, that is, within time T3. This can be done by detecting

Furthermore, instead of expressing the meaning of each signal mainly by the pulse width as shown in the figure, the meaning may be expressed by a specific frequency or specific logical value or logical data.

In particular, when the forced off mode signal S5 or the reset signal S6 is required to output a specific level continuously instead of a pulse type, such as a continuous output of logic "1", and When employing the discrimination method regarding the mode instruction signal S3 as in the illustrated embodiment, the forced off mode signal S5' and the reset signal S6 at the time when they should be invalidated may overlap; This can be easily handled by lightly using an OR circuit or the like, and when the two overlap, giving priority to the reset signal.

Similarly, the configurations of the mode designation circuit 26, the mode designation signal detection circuit 26, and the safety circuit 16 themselves can be easily arbitrarily selected by those skilled in the art, whether they are analog circuits or logic circuits that satisfy the above operations. You can design anything.

Furthermore, if one momentary switch is used for starting combustion and one for stopping combustion, the operation described above will occur even if they are simply connected in parallel, but in that case the user will accidentally operate the stop switch. However, if the equipment is in the combustion pause state at that time, it will start combustion, and if you operate the combustion start switch, it will stop, so please take the trouble to expect a clear operation and set it for starting and stopping. There is little point in using two momentary switches.

Therefore, in such a case, the on mode signal S
When 2on appears, the operation of the combustion start switch is disabled, and on the contrary, the off mode signal S2off is disabled.
The present invention can be effectively used by adding a logic circuit or the like that disables the combustion stop switch when the combustion stop switch appears.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a preferred embodiment of a remotely controlled combustion device according to the present invention, and FIG. 2 is an explanatory diagram of the operation of the circuit device shown in FIG. 1. In the figure, 10 is a base unit, 11 and 21 are microcomputers, 12 and 22 are transmitting circuits, and 1
3 and 23 are receiving circuits, 14 and 24 are power supply circuits, 1
5 and 25 are mode instruction signal detection circuits, 16 are safety circuits, 17 are fuel valve drive circuits, 20 are remote units, 26 are mode designation circuits, 27 are momentary operation switches, 30 are two-wire power supply and data transmission It's a railway line.

Claims (1)

[Claims] 1. A base unit that directly controls combustion equipment and two or more remote units that operate the base unit from a remote location are connected by a two-wire data transmission line that also serves as a power supply line. In addition, a remotely controlled combustion device is provided in which each of the base unit and the remote unit has a built-in microcomputer for creating and transmitting and receiving various data for combustion control to be carried on the data transmission line; A momentary operation switch is provided in the remote unit and changes its output state only when operated by the user; A momentary operation switch is provided in the remote unit and has an on mode when the combustion equipment is in the combustion state and a momentary operation switch in the rest state. A mode signal output circuit that differentially represents the off mode in a certain case; a hardware circuit provided in the remote unit and separate from the microcomputer built in the remote unit, If the operation switch is operated while the mode signal is in the off mode, an on mode instruction signal in a form different from the various data for combustion control will be generated, while when the mode signal is in the on mode, the operation switch will be operated. a mode specifying circuit that outputs an off mode instruction signal in a form different from the on mode instruction signal when the switch is operated; When the hardware circuit differentially detects the off mode instruction signal sent through the data transmission line, it gives a forced off mode signal to the microcomputer built in the base unit to activate the combustion stop function. and a mode instruction signal detection circuit that resets the microcomputer built in the base unit and then activates a combustion start function when the on mode instruction signal is differentially detected; The output forced off mode signal forcibly stops the function of the fuel valve drive circuit to maintain the fuel valve in a closed state, and the reset signal output from the mode instruction signal detection circuit allows the fuel valve drive circuit to operate. A remotely controlled combustion device having a safety circuit;