JPS6053254B2 - stove control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for electrically controlling the operation of a stove, such as a forced air supply/exhaust kerosene stove, and particularly to a countermeasure against malfunction of an operation selector switch.

Recent forced air supply and exhaust type kerosene stoves incorporate control devices centered on microcomputers, which not only switch between continuous operation such as fire extinguishing, but also switch off timer control that automatically stops operation after a set time, and settings. In addition to being able to perform on-timer control that automatically starts operation when the specified time is reached, it also functions as a clock, and has display functions such as displaying the time on a numeric display and displaying the set time related to timer control. I have more and more things.

In the case of this type of stove control device, an operation selector switch is provided to select at least one of the following modes: fire-off mode, continuous operation mode, and timer operation mode, but in most cases, the operation selector switch is an interlocking selection type or self-holding type. A push button switch is used.

In other words, there are three push-button switches, each corresponding to the fire break mode, continuous operation mode, and timer operation mode, and as is well known, under normal conditions, one push-button switch is always pressed and locked in the on state. , when another push button switch is pressed, the locked push button switch is reset and the newly pressed push button switch is locked in the on state. The control device performs predetermined controls such as driving, stopping, and timer monitoring according to the mode selected by the operation changeover switch. by the way,
The interlocking selection type/self-holding type push button switch shown above is
Due to its structure, strong vibrations may cause the locked pushbutton switches to return to normal, resulting in an abnormal state in which all pushbutton switches are turned off.

Moreover, if a certain push button switch is pressed down halfway, the locked push button switch will only be reset, but the newly pressed push button switch will not be locked, and all the push button switches may turn off. The conventional control device is configured to stop the operation of the stove when an abnormal state occurs in which all the push buttons of the operation changeover switch are turned off due to the above reasons.

Although this conventional method is preferable in terms of safety,
Considering that the user is a general consumer, this is not necessarily preferable in terms of practical operability. For example, when the continuous operation switch of the operation selector switch is on and the stove is burning, when you press the timer operation switch to switch to the off timer operation mode, the pressing operation is half-hearted as described above. If all operation selector switches are left in the OFF state, combustion will stop in conventional devices, and even if the user notices this and presses the timer operation switch again, once the fire is extinguished, the combustion will stop. has the disadvantage that combustion does not start. This is because even if the timer operation switch is pressed again and the stove goes into operation, safety measures have been taken in this type of stove to prevent it from being relit unless the burner cools down to a certain temperature. In the case of a kerosene heater, even if it is restarted immediately after it is stopped, it will take 1 hour before it is actually re-ignited.
It takes about 0-2 minutes of time. For this reason, there are mistakes in the operation of the switches as mentioned above, and even if they are corrected immediately, the fire ends up going out for a considerable amount of time, leaving the room cold. Note that a slide switch or rotary switch is sometimes used as the operation selector switch, but even in this case, if it is left in an intermediate position other than the normal selection position where the slide knob or rotation axis click is attached, all contacts will be turned off. Someday. This mode also exhibits an abnormal state in which it is not selected, resulting in the same inconvenience as described above.

The present invention has been made to solve the above-mentioned inconveniences, and the stove control device according to the present invention memorizes the mode selected by the operation selector switch, and stores all the modes selected by the operation selector switch. If an abnormal condition is detected in which the contacts are off and no mode is selected,
Continuing control in the memorized selected mode before the abnormality occurred, and also using the fact that an abnormality has occurred in the operation selector switch and that control is continued in the previously selected mode in response to the abnormality. In order to notify the person and call their attention, the system is configured so that a code specifying the previous selection mode and a special pattern indicating an abnormality are displayed together on the display that displays the time and timer setting time.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 schematically shows the overall wiring of a control system of a pot-type kerosene stove to which the present invention is applied.

1 is the main control unit, which starts operating when power is applied, preheats the burner, supplies fuel, ignites, monitors the ignition state, drives the air supply/exhaust fan and convection fan, and adjusts the set temperature. The main combustion controls of the stove, such as increasing or decreasing the amount of fuel supplied based on the difference between the two, are performed in a predetermined sequence.

The power supply path to the main control unit 1 includes a normally open contact of the output relay X2 (operation drive relay) of the timer control unit 2.
Normally open contact of relay X1 and self-holding relay X, normally open contact! A parallel circuit with is inserted in series.

Relay X1 is connected in series with burner temperature switch 3 between power supply terminals, and when the burner reaches a predetermined temperature (upper limit temperature at which ignition is possible) or higher, temperature switch 3 closes and relay X1 is driven. When the relay contact = is closed, the output of the timer control section 2 causes the relay contact ! When the main control unit 1 is closed, power is supplied to the main control unit 1, and the above-mentioned combustion operation is started.

At the same time, relay Even if it opens, the relay contact! Power continues to be supplied to the main control unit 1 via the main control unit 1. In addition, in a normal combustion state, if the relay contact, point j opens, or the power supply is cut off due to a power outage, the combustion operation under the control of the main control unit 1 will stop and the fire will ignite, and at the same time, the relay X3 will also return. do. Relay contact immediately after that! is closed again or the above power outage is restored,
The burner is at a high temperature due to previous combustion, and is it a relay contact? Since the is open, power is not immediately supplied to the main control unit 1, and the burner cools down to a predetermined temperature and the contact is closed. When the valve is closed, power is supplied and combustion control is restarted. Second
The figure shows details of the timer control section 2, and FIG. 3 shows the appearance of a control panel section related to the timer control section 2.

The timer control unit 2 is composed of a so-called one-chip microcomputer, and as is well known, the arithmetic processing unit CP
Input/output ports IN, O that connect the fixed storage unit ROM, read/write storage RAMl, and each external device described later
The program stored in the fixed memory MROM is sequentially decoded and executed by the arithmetic processing unit CPU, and the read/write memory mλAM is used as a storage area for various control data to store predetermined information corresponding to the input state from each switch described later. Create the output state as described below. In FIGS. 2 and 3, reference numeral 4 denotes an operation changeover switch consisting of the above-mentioned three-point interlocking selection type self-holding type push button switches SW1, SW2, and SW3.

SWl is the fire cutoff switch that is pressed (closed) to completely stop the operation of the stove.As shown in Figure 3, the button is accompanied by the notation "゜Firebreak゛" and is a symbol for the firebreak mode. It is written as ゜゜1゛.
SW2 is a continuous operation switch that is pressed when operating the stove continuously, and the notations "continuous" and "゜゜2" are attached to this push button.SW3 is used for the above-mentioned off timer control or on timer control. This is a timer operation switch that is pressed to enter the timer operation mode, which turns the operation on and off. Each switch SWl,
SW2 and SW3 each have two circuits of contacts as shown in FIG. 2, and one contact of each is connected between the output port 0UT1 and the input port INl of the timer control section 2.

The remaining contacts of the continuous operation switch SW2 are connected to the base of the transistor 5 that drives the relay X2 and the power supply +V.
Similarly, the remaining contacts of the ignition switch SWl are inserted between the base of the transistor 5 and the ground. The base of this transistor 5 is the output port 0UT
2, and the transistor 5 and relay X2 are controlled to be turned on and off according to the calculation result of the timer control section 2. If the fire cutoff switch SWl is closed,
Even if the timer control unit 2 malfunctions, the output port 0UT2
Even if the signal of 66r5 becomes high level, the transistor 5
Since the base of is grounded via the ignition switch SWl, the transistor 5 and the relay X2 are not driven. Similarly, if the continuous operation switch SW2 is closed, the timer control unit 2 malfunctions and the signal of the output boat 0UT2 becomes low level 6.
011, the base current flows to the transistor 5 via the switch SW2 and drives the relay X2.
One contact is not used. Reference numeral 6 denotes a 4-digit, 7-segment numerical display, which is connected to the output port 0UT3 of the timer control section 2, and in addition to displaying the time or timer setting time as described later, also displays an abnormality according to the present invention.

SW4, SW5, and SW6 are interlocking display changeover switches that can be selectively closed by one slide knob 7. When displaying the time on the display 6, close the switches SW,
To display the set time for off timer mode, press switch S.
Close W5 and close switch SW6 to display the set time of the on timer mode.

SW7, SW8, and SW9 are time setting switches each consisting of an independent momentary type push button switch, and a clock register RcK and an off timer register R set in the storage RAM.

l, input register R. It is used when storing desired time data in N. SW,. is an on-timer reservation switch consisting of an alternate push-button switch, which is also closed when entering the above-mentioned timer mode. Each of the above switches SW
,~SWl. are output boat 0UT, and input boat IN2
connected between. 8 is a light emitting diode that is turned on via the output port 0UT5 in the on-timer mode.

Next, the control and processing procedures of the timer control unit 2 defined by the program stored in the memory 90M will be explained with reference to FIG.

When power is applied to the timer control unit 2, an initializer routine (1) is first executed, and the CPU, RAM, and each input/output board are set to the initial state.

In the next time data processing routine (2), time is measured based on the power frequency of 50Hz or 60Hz, and J
RAI! The contents of the clock register RCK in i are sequentially incremented, and the time data stored in the off timer register ROFp is sequentially decremented.

In the next step (3), the state of the operation selector switch 4 is read.

That is, a signal is issued from the output port 0UT1, the states of the switches SW1, SW2, and SW are fetched from the input port IN1, and are temporarily stored in the input register R1N set in the RAM. In the next step (4), step (3)
Check the status of the operation selector switch 4 read into the above registers R and N, and check whether the switches SWl, SW2, and SW3 are all in an abnormal state of ゜゜0゛ (off), or one of the switches is ``゜゜1''. It is determined whether the state is normal or not.

If the state of the operation selector switch 4 is normal, the process advances to step (5), and the operation mode register R. Transfer the contents of input register R1N to n. That is, the operation mode selected by the operation changeover switch 4 (one of the fire cutoff mode, continuous operation mode, and timer/operation mode) is stored in the operation mode register Rrll. In the next step (6), display changeover switches SW, SW5
, SW6, time setting switch SW, , SW8, SW9 input timer reservation switch SWl.

Read the status of. That is, a signal is emitted from the output port 0UT'4 to each switch SW, to SWl. The state is fetched from the input port IN2 and stored in a predetermined area of the RAM. In the next display routine (7), the status of each switch SW, to SWlO stored in the RAM and the operation mode register R. ．． Depending on the contents of the clock register "RCK,"
Control to display the time data of any of the input timer registers RO8 on the display 6 by hitting the off timer register RO, and input the data set by operating the data setting switches SW, SW8, SW9 to the clock register Rc. Or off timer register R.

control to be stored in pp or input timer register RON;
On-timer reservation switch SWl. The light emitting diode 8 is controlled according to the state. In the next relay control routine (8), the operation mode Zista F. ．． and input timer reservation switch SWl.

The relay X2 is controlled to be turned on or off based on the state of the clock register RCK, the off timer register RO group, and the time data of the on timer register RON. That is, the operation mode register R. ．． When the content of is fire cutoff mode, output boat 0UT2 is set to ゜“0”, relay X2 is not driven, and operation mode register Rw
．． When the content of is continuous operation mode, output boat 0UT2
is set to ゜゜1゛, relay X2 is not driven, and the operation mode register R. ．． When the content is continuous operation mode, output port 0UT2 is set to ゜"1゛5 and relay X2 is driven.
Also, the operation mode register R. ．． When the content of is the timer operation mode, when the time data of the off timer register ROpp is not zero, relay X2 is driven, and when it is zero, relay X2 is driven.
do not drive. Furthermore, the operation mode register Rfi. The contents of the timer reservation switch SWl are entered in the timer operation mode.
. If it is also ゜゜1゛, the relay X2 is controlled by comparing the current j time in the clock register RCK and the operation start time in the input timer register RON. If the operation selector switch 4 is normal and one of the modes is selected, the above step (2)
)→(3)→(4)→(5)→(6)→(7) are repeatedly executed at high speed, and relay X2 is controlled according to the selected mode.

By the way, if the push button switches SWl, SW2, SW of the operation changeover switch 4 all return to the OFF state due to the cause mentioned above, this abnormal state will be detected in step (4).
), and the process branches from step (4) to step (9). In step (9), it is determined whether or not the contents of the operation mode register Rm are in the timer operation mode. If the contents are in the timer operation mode, the process proceeds to step (13). If not, in step AO, the contents of the operation mode register Rm are set continuously. It is determined whether or not the mode is the operation mode, and if it is the continuous operation mode, the process proceeds to step (12), and if not, the process proceeds to step (11) (determined to be the fire break mode).

In step (11), the symbol RlJ of the fire extinguishing mode and the special pattern 1-- representing the abnormal state are displayed together on the display 6.

That is, the time display on the display 6 disappears, and the display shows r1--. Similarly, in step (12), R2 consisting of the continuous operation mode symbol and the above special pattern is selected.
- - is displayed on the display 6.

Similarly, in step (13), the display 6 displays a message R3-- which is composed of the symbol of the timer operation mode and the above-mentioned special pattern.

After the abnormality is displayed in any of steps (11), (12), and (13) above, the relay control routine (18)
Return to

Therefore, control based on the operation mode selected before the operation changeover switch 4 became abnormal continues. For example, if continuous operation is selected with the operation selection switch 4, steps (2) → (3rd step (4) → (5th step (6th step (7th step)
When code (8) is repeated and the switch is operated to switch to timer operation as described above while the loop X2 is being driven, all switches SWl, SWl,
If SW2 and SW3 are left in the reset state, the control goes to steps (2) (3) (4) (9) 0I (12
) (8) is repeated, the operation mode register R. ．． The contents of are saved in continuous operation mode, and step (8)
), processing is performed based on the continuous operation mode, and relay X2 continues to be driven.

Further, by executing step (12), an abnormality message R2-- is displayed on the display 6. By looking at this abnormality display, the user knows that the operation selector switch 4 is in an abnormal state, and also that the continuous operation mode with the symbol ゜゜2゛ is currently being controlled. . In this way, there is no possibility of an unexpected fire breakout, and safety is ensured by displaying the abnormality. Note that even when a slide switch or a rotary switch is used as the operation changeover switch, the same effect as described above can be obtained.

As explained in detail above, according to the stove control device according to the present invention, there is no possibility of a practically inconvenient flame out state in response to an abnormality in which no mode is selected with the operation selector switch. The operability is greatly improved, and since the abnormality display alerts the user, there is no problem in terms of safety.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of the control system according to the present invention, Fig. 2 is a block diagram showing details of the timer control section, Fig. 3 is an external view of the control panel section, and Fig. 4 is an operation program of the timer control section. This is a flowchart. 1... Main control section, 2... Timer control section, 3... Burner temperature switch, 4 (SWl, SW2
, SW3)...Operation selector switch, 6...
Display, X2... Operation drive relay, Rm...
Operation mode register.

Claims (1)

[Claims] 1. An operation selector switch that selects at least one mode from fire break mode, continuous operation mode, and timer operation mode, and the status of this operation selector switch is repeatedly monitored, and when one of the above modes is selected, An input reading means for setting the selected mode in the storage section, an output control means for controlling the operation according to the mode set in the storage section, and a display of the time obtained by the timekeeping means or the set time related to the timer operation. The display control means selectively displays the display on the display according to the changeover switch, and the input reading means sets the information in the storage unit when an abnormal state is detected in which no mode is selected with the operation changeover switch. A control device for a stove, comprising means for forcibly displaying a combination of a code representing a mode in which an abnormality has occurred and a special pattern representing an abnormal state on the display.