JPS61285315A - Automatic combustion control device of remote control type - Google Patents

Abstract

PURPOSE:To make it possible to automatically reset a base unit and a remote control unit at an initial state in case of an abnormal condition in a transmission circuit or a reception circuit, by providing an abnormal condition detecting circuit adapted to reset a microcomputer after a set period. CONSTITUTION:Abnormal-condition detecting circuits 15 and 35 monitor data transfer periods by always monitoring the output of receiving circuits 14 and 34 provided in a base unit 10 and a remote control unit 30-i respectively, and comparing the corresponding voltage of pulse period of reception data 17 and 37 outputted by the receiving circuits 14 and 34 with a reference level, thereby judging as to whether transmission-and-reception data transfer interval exceeds a set interval or not. When the former exceeds the latter, the state is judged as abnormal, reset signals 18 and 38 are outputted to imicrocomputers 11 and 31 respectively to reset them.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a remote control V4 type combustion control device, and in particular,
The data signals exchanged between the fixed base unit that directly controls the combustion equipment and the remote control unit connected to the base unit via a transmission line are monitored, and if an abnormality occurs, the base unit A remote-controlled combustion system that has been improved so that it can determine that an abnormality has occurred in the microcomputer or other circuit system contained in each of the base unit and remote control unit and reset the base unit and remote control unit to their initial states. Regarding a control device.

<Prior Art> Recently, remote control type combustion control devices having one or more remote control units have come to be used as control devices for various combustion equipment. The system configuration is as shown in FIG.

That is, the base unit NO directly controls the combustion equipment (not shown), and the remote control unit 30-1.30- is installed at a location apart from the base unit.
2. ,,,． 3O-n (n=1.2., ,,,) are generally MA8 connected by two transmission lines 20, and the transmission lines 20 usually also serve as power supply lines, and there is a power supply between them. A potential EO is given.

Therefore, conversely speaking, the power line 20 is used to connect the base unit 10 and the remote control unit 30.
-1.30-2. ,,,． Data signals are transmitted to and from the terminal 30-n, and there are basically two modes as shown in FIG.

For example, if the data signal is as shown in the top row of FIG. 5, in the first transmission mode t1, the power supply potential EO is turned on and off in synchronization with the data signal.

On the other hand, in the second transmission mode cloud 2, a frequency component or a carrier corresponding to the data signal is superimposed on the DC power supply potential Eo. Level “L”
During a certain period, a carrier signal of a predetermined frequency is transmitted to the DC line 2.
Superimposed on 0. However, the power source may be AC, and even in that case, by using a frequency different from the power source frequency,
This superimposition method can be similarly adopted.

Data signals that are mutually transmitted in this way are generally
While the base unit IO sequentially scans the plurality of remote control units 3O-i (i zero 1.2, 3., . . . , n), data is always transmitted and received in both directions at a constant period.

<Problems to be Solved by the Invention> However, in the conventional remote control type combustion control device having the system configuration as described above, if any abnormality occurs in the base unit or remote control unit, for example, the built-in If a program runaway occurs in a microcomputer, there is no safety structure to properly deal with this, and even after the cause of the abnormality has been removed, if measures such as unplugging the power cord are not taken, the base unit and remote control will be damaged. It was not possible to restore the control unit to its initial or normal state.

The present invention was made with the aim of solving this problem, and when an abnormality occurs in the microcomputer or data transmitting/receiving circuit built in the base unit or remote control unit, The present invention aims to provide a combustion control device that can automatically reset the combustion engine and remote control unit to the initial state.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a remote control type combustion control device having the following configuration.

A base unit that directly controls the combustion equipment and a remote control unit that controls the combustion equipment from a remote location are interconnected via a data transmission line, and data to be loaded on the data transmission line is created. ,
A remote-controlled combustion control device comprising a microcomputer in each of the base unit and a remote control unit for transmitting and receiving data, and transmitting the data at scheduled transmission intervals; If the above-mentioned data is not transmitted to each of the remote control units and the above-described scheduled data transmission interval after a judgment time exceeding the scheduled data transmission interval, an abnormality is detected that resets the above-mentioned microcomputer for a set period of time. A remote control combustion control device characterized by: having a circuit;

<Operation> According to the present invention having the above configuration, when data is normally exchanged via the transmission line at the scheduled transmission interval or transmission cycle, the abnormality detection circuit does not issue a reset signal, but If no data is being transmitted after the judgment time set above the scheduled time, the abnormality detection circuits in the base unit and remote control unit reset their own microcomputers. do.

Then, since the reset signal is released after the set time, the microcomputer is in a state where it can be restarted.

Therefore, when the data transmission interval becomes abnormally long as described above (including stoppage as a special case), it is likely that some kind of abnormality has originally occurred in the microcomputer or data transmission/reception circuit. Because,
According to the present invention, when an abnormality occurs, the base unit and remote control unit can be reset immediately, and the reset state is canceled after a set time, so that the cause of the abnormality is not self-recoverable. In such a case, the base unit and the remote control unit can be restarted without requiring the user's intervention. There is no need to unplug the power cord once.

In addition, even though it is possible to restart after the reset signal is released after the set time has elapsed, if the cause of the abnormality has not been removed, the abnormality detection circuit will work again and reset the microcomputer. From, etc.
No problems arise.

Embodiment FIG. 1 shows a combustion control base unit 10 in an embodiment of a remote-controlled combustion control device according to the present invention, and a plurality of remote controllers each connected to this base unit IO via a transmission line 20. Control unit 30-1.30
-2. ,,,． The schematic internal configuration of 3O-n (n-1, 2, , , , ) is shown, and each remote control unit 3O-i (i=1.2., , , , n) has the same configuration. For this remote control unit, please use the first remote control unit 3.
They are represented by 0-■, and the others are simply enclosed in a frame. however,
The codes in the following explanation are - film code 3
Use 0-i.

Referring also to the waveform diagram of each part in FIG. 2, the microcomputer 11 in the base unit 10 sends the transmission data to the transmission circuit 13 as shown in the first part (■). Send e.

The transmitting circuit 13 that receives this transmits the transmitted data 1B onto the transmission line 20 which also serves as a power supply line using an appropriate transmission mode. Here, it is assumed that transmission mode cloud 2 is followed in the explanation regarding the fifth factor. Therefore, the waveform of the transmission line 20 at this time is as shown in the section (3) in FIG.

Regarding the transmission line 20, each remote control unit 30-i is all parallel, and the above data 16 is input to all remote control units 30=1, but here, first, the first remote control unit) Assuming that only 30-1 is set to receive this transmission data 16, the receiving circuit 34 in the M remote control unit 3o-1 extracts the carrier as a data signal component in the transmission line. , received data 37 as shown by part ■ in FIG.
is obtained and inputted into its own microcomputer 31.

On the other hand, even if it is in the base unit) 10, the receiving circuit 1
4 monitors the transmitted data 16 via the transmitting circuit 13, and therefore, the receiving circuit 14 outputs data 17 as shown in the part ■ in FIG. It is returned to the computer 11.

This feedback signal causes the microcomputer 11 in the base unit 10 to send the currently transmitted data IB
Recognizing that this is for the first remote control unit (30-1), performs the necessary processing.

The remote control unit that received the transmission data 18 sent from the base unit as described above) 3
0-1, the predetermined transmission data 3 days to be sent back to the base unit in accordance with the transmission data 16 is shown in the section ■ in FIG.
The transmission data is created as shown in , and the transmission data is sent out to the transmission line 20 via the transmission circuit 33, as also shown in the part (3).

The receiving circuit 14 in the base unit, unit NO, detects this data as received data 17 and inputs it to the microcomputer 11, as shown by part 2 in FIG.

As before, this remote control unit 30-1
Even within the transmitting circuit 3, the transmission data 36 sent by itself is transmitted to the receiving circuit 3.
4, the signal is monitored as shown by part 3 in FIG. 2, and is similarly fed back to its own microcomputer 31.

While updating the data, the second, third and subsequent remote control units 30 perform this kind of operation.
The illustrated system works by iterating over -i. Of course, from the nth number, it returns to the first one.

If only such a data transmission operation is performed, it is a normal or normal operating state, and such a sequence has been used in the past.

In contrast, the present invention is particularly effective when a periodic abnormality occurs in the data transmission state, as will be explained below.

As described above, under normal conditions, data is always repeatedly loaded on the transmission line 20 at least at a specific time interval or less. In other words, the data transmission interval between data should be within a certain period of time.

Therefore, if you think about it in reverse, the microcomputer ratio in the base unit IO or any remote control (22)) 30-i in the microcomputer 31
Accidents such as runaway can be detected by the data transmission cycle being disrupted. Stopping data transmission is conceptually included in special cases, and is only one example of the Nagaoka periodization anomaly, but as will be explained later, when some kind of abnormality occurs, transmission will generally stop. It often comes to that.

Therefore, in the present invention, conversely, in order to judge an abnormality when no data is transmitted for a predetermined judgment time or more, the data transmission period is set in the base unit 10 and each remote control unit 3o-i. Abnormality detection circuits 15 and 3 that constantly monitor
5 will be provided.

In the illustrated embodiment, each abnormality detection circuit 15, 35 constantly monitors the outputs 17, 37 of the receiving circuits 14, 34 in the respective units. In particular, this abnormality detection circuit 15.35 should have a circuit configuration as shown in FIG.

Since the same configuration can be adopted as the abnormality detection circuit for both the base unit and each remote control unit, the abnormality detection circuit 15 for the base unit) 10 in FIG.
This is a representative example.

The received data 17 from the receiving circuit 14 is first sent to the differentiating circuit 1.
51. However, the output is selected to be unipolar, so that only a differential pulse in the negative direction is generated in response to each rise in the negative direction of the data signal, as shown by the part ■ in Figure 2. has been done.

This differential pulse train 152 in the negative direction is generated by the voltage conversion circuit 1
53, and therefore its output waveform becomes a pulse period corresponding potential 154 which shows a change corresponding to the period of the differential pulse 152, as shown by the portion [share] in FIG.

Therefore, under normal conditions, as clearly shown in the relevant part [phase] in Figure @2, this voltage 154 changes minutely every time a pulse forming each unit of data is received. The average potential does not drop significantly.

On the other hand, if the data transmission period 1 becomes long, the voltage conversion circuit 153 is shortened.
4 is steadily decreasing.

Therefore, by setting the limit of the decrease, it is possible to create a criterion for determining whether the potential is abnormal, and the time from when the potential begins to decrease to reaching the above-mentioned determination level can be considered as the determination time for abnormality detection. I can do it.

In this embodiment, the determination time is set: 1. A stable determination level Et is used to create the inter-chamber standard. X, with this as a critical value, the output potential 15 of the voltage conversion circuit 153 is
4).

That is, under normal conditions, as shown in FIG. 2, the potential determination circuit 1
The output of 5θ is also fixed to one of the binary logical values, l and %.9 For example, in the case of an abnormality, it continues to output a logic "H" which is a non-significant logical value. When the data transmission interval becomes abnormally long, the output potential 154 of the voltage conversion circuit 153 continues to decrease, and as a result, it eventually falls below the 1 judgment level Et, as shown by the part ■ in FIG. The output of the potential determination circuit 156 transitions to a significant logical value "L" indicating an abnormality. In other words, this means that data has not been transmitted even after one determination period has passed.

This transition to the significant logical value "L" causes the reset signal generating circuit 157 to generate the reset signal 18 for a time period of t, thereby resetting the microcomputer 11.

Here, the duration of the reset signal 18, that is, the time Tt during which the microcomputer 11 is in the reset state, is designed to an appropriate value by the time setting circuit 158.

In other words, the microcomputer 11 is maintained in the reset state when the reset signal 18 falls to logic "L", and the microcomputer 11 restarts when it returns to logic "H" after the set time Tt has elapsed. It is now allowed.

Therefore, if the cause of the abnormality is not serious and can be self-recovered, once the microcomputer 11 is reset, the initial state will be automatically realized. Upon canceling the reset, if the cause of the abnormality has already been resolved, the base unit can be reset without any user intervention).
10 can be restarted.

And of course, even after the reset signal 18 returns,
If the cause of the abnormality has not been removed and the abnormal state remains, the above mechanism will occur again and the reset signal 18 will be issued again.

The above action applies to each remote control unit) 30-
The abnormality detection circuit 35 built into i also performs the same process. Therefore, not only the base unit 10 but also
This device functions effectively even when there is an abnormality in each remote control unit 30-1.

In particular, if we consider common abnormality modes, in such a system, if an abnormality occurs in the base unit or one remote control unit 30-i, it will not only result in a longer transmission interval, but will also cause the transmission to stop. It is normal to reach .

That is, for example, if an abnormality occurs in the microcomputer 11 in the base unit, the microcomputers 31 of each remote control unit 0-i that are operating normally will not receive data from the base unit 10. , no longer transmitting data,
This will equivalently result in data transmission being stopped, and conversely, even if an abnormality occurs in the microcomputer 31 of one of the remote control units 7) 3G-i, data transmission from the base unit 10 will not be possible. However, since no reply is received, the next data transmission from the base unit is no longer performed, and data transmission is therefore stopped.

In any case, in such a case, according to the device of the present invention, the base unit 10 and all remote control units) 30-i can be automatically reset to the initial state 7g. It is obvious that this method effectively acts on the long-period abnormality, even if it does not lead to a shutdown.

Furthermore, for the reset signal generation circuit 157 that automatically restores the logical value after the set time Tt has elapsed, various circuits can be assembled by those skilled in the art using known and existing circuit techniques. As will be disclosed separately, a power-on reset circuit often used in circuit systems using this type of microcomputer can also be used.

In other words, when the potential determination circuit 156 sends out an abnormal inverted logic output, it generates a pulse that produces the equivalent state as when the power is turned on, and provides this pulse to the bird power-on reset circuit. 11, 31 can be reset and then restarted.

Although the above embodiment has been described as having a plurality of remote control units, it is clear from the effects of the present invention that the present invention can be effectively applied to any combustion control device having at least one remote control unit. Although it is preferable to do so, the data transmission line is not limited to being shared with the power supply line, and may be provided exclusively.

Regarding the data transmission mode, in the above embodiment, of the two modes shown in FIG. 5, the cloud 2 transmission mode is used, but the cloud 1 transmission mode may be used.

Also, the setting positions of the abnormality detection circuits 15 and 35 are
It is preferable that the receiving circuits 14 and 34 be placed after each of the receiving circuits 14 and 34 as in the above embodiment because it has the ability to detect not only abnormalities in the microcomputer 11.31 but also abnormalities in the transmitting and receiving circuits 13, 33, 14, and 34. .

(Effects of the Invention) According to the present invention, extremely rational countermeasures can be taken when some kind of abnormality occurs in the remote control type I combustion control device consisting of a base unit and a remote control unit.

First of all, since whether or not an abnormality has occurred is determined based on the data transmission interval, regardless of the cause of the abnormality, it can be determined that it is an abnormality for the time being. .

If an abnormality is detected, the microcomputer built into the base unit or remote control unit can be immediately reset.

Therefore, after an abnormality occurs, difficult combustion control will not be performed;

Since the reset signal is released after the set time has elapsed, it is possible to avoid the inconvenience of not being able to restart the system unless the power cord is unplugged.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of the main parts of a remote control combustion control device according to a preferred embodiment of the present invention, Fig. 2 is a signal waveform diagram of the main parts in the circuit shown in Fig. 1, and Fig. 3 is an abnormality detection circuit. J
FIG. 4 is an explanatory diagram of an example of a conventional system configuration of this type of remote control type combustion control device; FIG. 5 is an explanatory diagram of an example of a data signal and its transmission mode;
It is. In lff1, 1G is the base unit/to, 11, 3
1 is a microcomputer, 13 and 33 are transmitting circuits,
14.34 is a receiving circuit, 15.35 is an abnormality detection circuit, 1
7.37 is received data, 18 is a reset signal, and 30 is a remote control unit. , Application: Osaka Hanshin Electric Co., Ltd.
・What?

Claims (1)

[Claims] A base unit that directly controls a combustion device and a remote control unit that controls the combustion device from a remote location are interconnected via a data transmission line, and the data transmission line Create data to be posted on
The base unit and the remote control unit each include a microcomputer for transmitting and receiving the data, and the data is transmitted at scheduled transmission intervals; Each of the remote control units is provided with an abnormality detection circuit that resets the microcomputer for a set period of time if the data has not been transmitted after a judgment time equal to or longer than the scheduled data transmission interval. A remote control combustion control device characterized by;