JPS6014042A - Heating control device - Google Patents

Abstract

PURPOSE:To prevent a heating device from wrong operation and improve the safety of the heating device by a method wherein a transmission microcomputer is provided to detect a malfunction generated in a processing microcomputer and a transmission line, then the power supplying for the heating device is cut-off and the operation of the heating device is stopped. CONSTITUTION:A microcomputer 15 for processing control and a microcomputer 10 for signal transmission are arranged, the microcomputer 15 controls the heating of a heating device 14, the microcomputer 10 connected with the microcomputer 15 via transmission lines 16-23 transmits and receives the transmission signals having a certain format. The microcomputer 10 detects the regularity of said transmission signals, when detects at least one malfunction in either the microcomputer 15 or the transmission lines, cuts-off the power supply for the heating device 14 by a relay circuit 27. Therefore, the wrong operation such as an abnormal heating and the like in the heating device can be prevented, accordingly, the safety of the heating device can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a process microcomputer that controls the operation of equipment such as a water heater, and a transmission system that sends and receives signals such as the heating status of the equipment and set temperature input by a remote controller. This relates to a heating control device that is equipped with a microcomputer and shuts off the power supply to the device when an abnormality is detected based on the above-mentioned signals.Conventional configuration and problems thereofIn recent years, heating control devices have been used in devices such as water heaters. With the diversification of device functions, it has become important for devices to have complex and highly accurate heating control and advanced information processing capabilities that improve operability using remote controls and the like.

FIG. 1 is an overall configuration diagram of a first conventional heating control device. In FIG. 1, reference numeral 1 denotes a microcomputer (hereinafter referred to as a microcomputer) that receives set temperature and operation start/stop signals input from a remote controller 3 connected via a transmission line 2, and controls the operation of a water heater 4 based on the signals. It is called a microcomputer.) 6 is a power source that supplies power to the water heater 4.

In such a conventional configuration, when the functions of the water heater 4 are diversified and complex and highly accurate heating control is required, the capacity of the microcomputer becomes extremely large.
control signal from the remote controller 3,
It has been extremely difficult to detect abnormalities in the transmission line 2, prevent malfunctions of the water heater 4, and ensure sufficient safety.

FIG. 2 shows a second conventional heating control device constructed using a plurality of microcomputers in order to solve such problems.

In FIG. 2, reference numeral 6 denotes a transmission microcomputer that transmits signals sent from the remote controller for starting and stopping the operation of the water heater 4 connected to the power source 5 and the set temperature to the process microcomputer 8. Heating control of the water heater 4 is performed via a transmission line 9 connected between the water heater 4 and the water heater 4.

However, in the above-mentioned conventional heating control device, if the transmission signal is disturbed by external noise or the transmission line 11 is disconnected or comes into contact, there is a risk that the process microcomputer 8 will malfunction and the water heater 4 will cause abnormal combustion. It had disadvantages such as high quality.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and includes a process microcomputer that controls a heating device and a transmission microcomputer that transmits and receives signals via a transmission path, and the transmission microcomputer is configured to control the process microcomputer or transmission based on the signal. The purpose of this system is to improve the safety of the heating device by detecting road abnormalities and stopping the operation of the heating device when an abnormality is detected.

Structure of the Invention In order to achieve the above object, the heating control device of the present invention is connected to a process microcomputer that performs heating control of a heating device via a transmission path, and transmits and receives a transmission signal having a certain rule. a transmission microcomputer, the transmission microcomputer having a cutoff means that detects regularity of the transmission signal and cuts off power supply to the heating device when an abnormality is detected in at least one of the process microcomputer and the transmission path. It becomes.

With this configuration, when any abnormality occurs in the process microcomputer and the transmission line, the transmission microcomputer cuts off the power supply to the heating device and stops the operation of the heating device.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is an overall configuration diagram of a heating control device according to an embodiment of the present invention.

In FIG. 3, reference numeral 10 transmits data indicating the set temperature and start/stop of operation entered by remote controllers 11 to 13 to the water heater 14 side, while the hot water temperature and operating status of the water heater 14 sent from the water heater 14 This is a transmission microcomputer that receives data indicating the data and transmits it to the remote controllers 11 to 13. 15
uses the signal sent from the transmission microcomputer 10 to
At the same time as starting and stopping the operation and controlling the temperature in step 4,
Data indicating the hot water temperature and operation status is sent to the remote controllers 11 to 1.
There is a process Miko: /f that sends to 3.

8 between the process microcomputer 16 and the transmission microcomputer 1o.
In order to transmit bit data in parallel, eight data lines 16 to 23 are used, and a handshake signal is sent from the transmission microcomputer 1° to the process microcomputer 15.
A (CTL) line 24 indicating the validity of the data on the data lines 16 to 23, a handshake signal from the process microcomputer 16 to the transmission microcomputer 1o, and a (FLG) line 25 indicating the input of data on the data lines 16 to 23, and the process microcomputer 16 027 is connected to the reset line 26 that sets the water heater 14 to the initial state. When the relay circuit 27, which is connected to the water heater 14, is de-energized, the terminals 30a and 3ob are connected. Open to cut off power supply.

FIG. 4 is an overall configuration diagram of the water heater 14 of the heating control device. In FIGS. A driver 35 is a driver for the combustion detector 34 that checks the operating state, 35 is a driver used for the igniter 37 that ignites the burner 36, and 38 is a driver that operates the solenoid valve 39 that adjusts the amount of gas to the burner 36. All are connected to the process microcomputer 15.

FIG. 5 is an external view of the remote controllers 11 to 13 of the heating control device, in which reference numeral 40 is an operation switch for starting and stopping the operation of the water heater 14, and 41 is an operation lamp that indicates the operating state and is lit during operation. 42 is a digital display that displays the water supply temperature, and 43 is a temperature setting knob that sets the temperature of the water heater 14.The operation of this embodiment configured as above 0 will be explained below.0 First, the transmission microcomputer 1o Data indicating the start of operation of the water heater 14 and temperature data set by the user using the remote controllers 11 to 13 are input, and data for heating control is transmitted to the process microcomputer 15.

6a and 6b show signal transmission diagrams using a full handshake procedure, and data transmission between the transmission microcomputer 10 and the process microcomputer 15 uses this full handshake procedure.

Now, the case where the transmission microcomputer 10 transmits data on start, stop, and set temperature of operation to the process microcomputer 15 will be explained using FIG. 6a.

First, at time t1, the transmission microcomputer 10 checks the state of the (FLG) line 25. If it is in the off state, the data line 1
Output data on 6-23. After a delay time tn until the data stabilizes, at time t2 (CTL) line 2
4 is turned on to indicate that data may be input.

On the other hand, from time t2 when the data line 24 of the microcomputer 15 ('CT L) is turned on, the data line 1
6 to 23 are input, and at time t3, the (FLG) line 26 is turned on to notify that the (CTL) signal has been received. Therefore, when the (F L G) line 26 turns on, the transmission microcomputer 10 turns on the (CTL
) Turn off line 24. Then, at time t5 when data input ends, the process microcomputer 15 (FLG
) Indicates that line 25 may be returned to the OFF state and primary data reception may be performed.

Next, the sixth section describes the case where the transmission microcomputer 10 receives data on operation status and hot water temperature from the process microcomputer 15.
This will be explained using a diagram.

First, the transmission microcomputer 10 turns on the (CTL) line 24 at time t1 when the (FLG) line 25 is off and requests data, and at time t2, the process microcomputer 15, which has received this request, ○Then, at time t6, (FLG) line 2 is output.
5 is turned on to notify that the data is valid. When the transmission microcomputer 10 detects this signal, it inputs the data, and then turns off the (CTL) line 24 at time t.
At time t5, when the process microcomputer 16 detects that the data has been received, it returns the (FL(,) line 25 to the OFF state.

FIG. 7 is a configuration diagram of the transmission data used in this embodiment. First there is an address 44 indicating each remote control 11, 12, 13, and then setting data 45 indicating the set temperature, start of operation, etc.
, parity data 46 for checking the data contents, and finally end data 47 indicating the end of the data.

Each data item still has a parity controller to check the data, and performs an operation (exclusive OR) on each bit to ensure that all data are even numbers.

As described above, each time one operation is performed, such 8-bit data is input through eight data lines 16 to 23, and this operation is repeated to transmit the data.

In addition, when the transmission microcomputer 10 transmits data in this manner, it confirms the reception of the process microcomputer 15 on the receiving side by checking the ON state of the (FLG) line 26, so that the reception signal from the process microcomputer 16 is not transmitted. Check for presence and if there is no received signal, process microcomputer 15
is not transmitting normally, or (FLG) line 2
It is possible to detect wire breakage abnormalities, etc. Further, by checking the parity data 46 and the bit contents of each data, the data lines 16 to 23 are disconnected.

Data abnormalities due to contact abnormalities and external noise,
Alternatively, a transmission abnormality of the process microcomputer 15 can be detected.

In this way, when the transmission microcomputer 10 detects an abnormality, it stops power supply to the relay circuit 27 and
3.35 and '38 are all turned off, so the operation of the water heater 14 is stopped without combustion in the burner 36.

As described above, the present embodiment includes a process microcomputer 15 that controls the operation of the water heater 14, and a transmission microcomputer 10 that transmits and receives data on set temperature and start and stop of operation, and the transmission microcomputer 1o is a process microcomputer 10. The regularity of the transmission signal from the processor 16 is detected, and abnormalities in the transmission of the microcomputer 15, transmission paths such as the data lines 16 to 23, and data abnormalities due to noise from the outside are constantly detected. When an abnormality is detected, power is not supplied to the water heater 14 and the water heater 14
The process microcomputer 15 in the event of an abnormality will stop operation.
It is possible to prevent abnormal heating of the water heater 14 due to malfunction of the water heater 14, and at the same time improve the safety of the water heater 14.

In this embodiment, the relay circuit 27 is used to cut off the power supply to the water heater 14 to stop the operation, but the reset line 26 of the process microcomputer 16 can be used to stop the operation of the water heater 14. .

Effects of the Invention As described above, according to the heating control device of the present invention, the transmission microcomputer detects an abnormality between the process microcomputer and the transmission line, and when an abnormality occurs, the power supply to the heating device is cut off and the operation of the heating device is stopped. Malfunctions such as abnormal heating of the device can be prevented, and the safety of the heating device can be improved, which has significant effects.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an overall configuration diagram of a first conventional heating control device, FIG. 2 is an overall configuration diagram of a second conventional heating control device, and FIG.
The figure is an overall configuration diagram of a heating control device according to an embodiment of the present invention, FIG. 4 is an overall configuration diagram of a water heater of the same heating control device, FIG. 5 is an external view of a remote control of the same heating control device, and FIG. 7 is a signal transmission diagram of the heating control device, and FIG. 7 is a configuration diagram of transmission data of the heating control device. 1o...Transmission microcomputer, 14...Water heater, 15...Process microcomputer, 16-23.
Old... Cheetah line, 24... (CTL) line, 25... (Fbe) line, 27...
...Relay circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
figure . Figure 6゜7

Claims (1)

[Claims] A process control microcomputer (hereinafter referred to as a process microcomputer) that performs heating control of a heating device, and a signal transmission microcomputer (hereinafter referred to as a process microcomputer) that is connected to the process microcomputer via a transmission path and transmits and receives transmission signals having certain rules. (referred to as a transmission microcomputer), the transmission microcomputer detects the regularity of the transmission signal, and when an abnormality is detected in at least one of the process microcomputer and the transmission path, cuts off the power supply to the heating device. A heating control device having a shut-off means.