JPS6032781B2 - Heating machine control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a heater, and particularly to a control circuit that enables so-called timer control for starting the heater.

In recent years, electronic control of household goods has been progressing, especially with the use of microcomputers to improve their performance. The improvement of the performance of this type of household appliances began with the provision of timer functions, but even in heating machines, for example, forced intake and exhaust hot air heaters (so-called F/F hot air heaters) Some ideas are starting to be proposed that, when a predetermined time is set, the system automatically starts up at that time and warms the room. This kind of thing is O
Providing the N timer function makes it possible to keep the room warm when the user wakes up, which is convenient in the middle of winter. However, the slave ON timer control in this type of heater mechanically starts the heating at the set time, and sometimes the room is so warm that heating is not necessary, so it is uneconomical in terms of fuel. There is a risk that it will become a thing.

On the other hand, as a consideration for fuel economy, although it is not actually in operation, the air conditioning load for air conditioning in large buildings such as buildings is calculated on a daily basis, and the air conditioning equipment is activated depending on the air conditioning load. A system has been proposed that attempts to eliminate the waste of air conditioning in a building by controlling the timing, such that the building is already being air-conditioned before the user's desired time. However, such control is complicated because the air conditioning load is detected at a high level of precision, and the device configuration is complicated and expensive, so it cannot be applied to home heaters.

Moreover, when looking at household heaters, it is expected that users will often set the set temperature too high, and in addition, heaters have no choice but to set a large control hysteresis for the set temperature. However, once started, operation is maintained until the room temperature is at least 1°C higher than the temperature set by the user, and all of this is done by consuming fuel, so fuel consumption increases. . On the other hand, this is related to the tendency of users to set the temperature higher than mentioned above, but in general, if the room temperature is very slightly lower than the set temperature, there is often no need to start the heater. It can be expected that such situations in which the room temperature and the set temperature become close to each other will occur frequently in early spring and the like. Therefore, the present invention was made in response to the above-mentioned usage situation of the heating machine, and it provides a simple function to the timer-controlled total room unit, thereby preventing the heating machine from being started mechanically. It is an object of the present invention to provide a control circuit for a heater that can reduce fuel consumption.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 is an external view of the heater (stove) main body 1.
The main parts are illustrated.

Reference numeral 2 denotes an operation section disposed on the surface of the stove body 1, in which various operation switches and a display 3 for displaying numerical values are also disposed.

Each component on the operating section 2 will be explained. 4 is a slide switch, and control specifications are specified according to each switching position of the slide switch. When the switching position of the slide switch 4 is in "A", it is "sleeve timer control", when it is in "B", it is "good morning timer control", when it is in "rD", it is "clock adjustment", and in "E". At times, "temperature setting" is designated, and normally the slide switch 4 is in the switching position "C", instructing the display 3 to display "time information". Further, the changeover switches 12 and 13 are switches used to start "sleeve timer control" and command emergency fire extinguishing. FIG. 2 is a block diagram of the control circuit of this embodiment, showing the circuit configuration centered on a central control unit (hereinafter referred to as MPU) 5 which is mainly composed of a so-called microprocessor. In the figure, 6 is a setting unit for setting control conditions, etc., 7 is a clock generator that generates a clock signal to be used when forming a clock mechanism in the MPU 5, and 8 is a sensor including a thermistor for measuring room temperature. 9 is a driven section consisting of various mechanical parts of the stove, the display 3, and the like. Here, the configuration and operation of the embodiment control circuit will be explained with reference to the flowcharts of FIGS. 3 and 4.

FIG. 3 shows the state of control when the slide switch 4 is set to the "A" position to designate so-called "sleeve timer" control which automatically turns off the stove after a predetermined period of time.
First, when the slide switch 4 is set to the "A" position,
This state change is detected at step PI, and the determination result of PI is "YES", indicating that "sleeve timer" control is requested. As a result, step P2 is subsequently executed, and it is determined whether the contents of register x are "0" or not. Register Decrease this value.
In response, in another program routine, the MPU 5 refers to the value of this register
0'', the stove is controlled to turn off, but since such a control method is typical of time-of-day control, it will not be described in detail. This step P2 is to prevent the stove from being turned off immediately by switching the slide switch 4 to the "A" position, and the determination result is "YES", that is, the content of register X is "0". When something is detected,
In the next routine P3, the contents of register X are forcibly preset to "2 pins".

Continuing from this, or if the determination result in step P2 is "NO", that is, the de-energization control will be performed after a certain period of time, and there is no risk of de-energization immediately,
It is determined in step P4 whether or not the minute setting pushbutton switch (abbreviated as minute PB) 10 on the operating section 2 in FIG. 1 has been pressed. Then, when minute PBI0 is pressed and the determination result in step 4 becomes "YES", step P5 is then pressed.
is executed to determine whether the value of register X is greater than 40 minutes, and if the value of register This judgment result is “NO”
Correspondingly, in step P6, the value obtained by subtracting 20 from the contents of register X is re-preset to register X and displayed on display 3. When the minute PBIO is further pressed, similarly to the case described above, if the value of register To go. This allows the operator to preset the contents of register X to a desired value in units of 20 minutes while checking the display on display 3. Minute PB like this
When the contents of the register x become less than 4 minutes while the IO operation is repeated, this state is detected at step P5, the determination result is "YES", and step PT is executed accordingly.

This step P7 determines whether the contents of the register
Determine whether or not. As a result of this judgment, the contents of register
If it is detected that the number is greater than 20 or less than 4, the determination result in step P7 is "NO", and the next step P8 corresponding thereto is executed. Step P8 forcibly presets the contents of register X to 20.

To describe the effect in response to the operator's operation, for example, the contents of register
”. Then, for the current pressing operation of PBIO, the determination result in step P7 becomes "NO" as described above, and the contents of register x are forcibly preset to 20 in step P8. That is, in the routine leading to P8 without steps P5 and P7, the contents of register X are changed to 2 due to the action of step P6.
This is a routine that prevents the value from being set to a value smaller than 0.
Next, the determination result in step P7 becomes "YES",
In other words, if the content of Regis x is 20 or less, step P
At step 9, the value of register x is forcibly preset to the maximum value of 3 hours.

That is, by controlling in this manner, it is possible to avoid a problem in which the stove that was in operation is deenergized during the sleeve timer setting operation because the contents of the register X become "0". When the control related to the sleeve timer settings as described above is completed, the control of the MPU 5 is transferred to other controls of step PIO, such as sleeve timer control based on the above settings, or routines for various controls as described below. Furthermore, from the purpose of prohibiting the stove from turning off while the sleeve timer is being set as mentioned above,
If it is detected in step P2 that the contents of the register x are a small value below a predetermined value, step P3 may be executed to force the number of double-powder large layers. Next, "ON timer control J" so-called "good morning timer control" will be explained with reference to the flowchart of FIG.

First, when attempting to start the stove 1 at, for example, 6:30 a.m., the operator operates the slide switch 4 to change the knob to the "B" position, and then switches the time setting pushbutton shown in FIG. (hereinafter abbreviated as time PB) 11 repeatedly to change the display on the time display section 3a of the display 3 to A.
Set M to “6”.

Subsequently, the minute PBIO is pressed to set the minute display section 3b to 30. This will register what should be "good morning timer control" at 6:30 a.m. Next, the operator switches the knob of the slide switch 4 to the "E" position to set the desired room temperature, and then presses the minute PBIO to set the minute display section 3b of the display 3 to the desired room temperature T2. . When the above operations are shown in the SI in FIG.
Data indicating "6:03 am" and desired set temperature "
Both data indicating "T2" are stored in the RAM in the main memory (
(not shown). After the above operations are completed, time has passed (step S2 in FIG. 4), and at 6:30 p.m., the MPU 5 uses its internal timekeeping function to
It is detected that the "good morning timer" has updated in the evening and has become "6:00 a.m. 3 p.m." (step S3). Subsequently, the MPU 5 executes step S4, detects and stores the current room temperature TI based on the output of a thermistor for room temperature measurement included in the sensor section 8 (FIG. 2).

Next, the MPU 5 reads out the set temperature T2 already stored in the RAM (step S5), and in the subsequent step S6 calculates the difference T3 (=T2-TI) between the set temperature and the room temperature.
Calculate and store. The above routine completes preparations for activation control, and the following routine determines whether or not to activate.This determination control will be explained below.

First, in step S7, based on the previously stored room temperature data TI, it is determined whether the room temperature is below 5°C.
If it is detected that the temperature is below .degree. C., step S8 is executed and the stove 1 is started to ignite. This function is intended to give priority to heating unless there are special circumstances when the temperature is as cold as 5 degrees Celsius, so this function can be removed. On the other hand, if it is detected in step S7 that the room temperature is higher than 500 (the determination result is "NO"), step S9 is executed, and the room temperature T
It is determined whether I is higher or lower than 2000.

If it is detected that the room temperature is higher than 20o0, step S
IO is executed, and in this step SIO, control is performed to reset the registration that there is a request for "good morning timer control", thereby prohibiting automatic startup of the stove 1 based on "good morning timer control". This is 2000
The idea is to save fuel consumption by prohibiting warming operations in relatively warm rooms. Conversely, if it is detected in step S9 that the room temperature TI is less than or equal to 2 pi○ (the determination result is "YES"), step SII is executed, and the diamond T3 of the room temperature with respect to the previously determined set temperature T2 is determined as " It is determined whether the indoor temperature is higher or lower than the set temperature.

If the judgment result is "NO" and it turns out that the room temperature is higher,
Control of the MPU 5 is transferred to the aforementioned step SIO, and automatic startup of the stove is prohibited. Also, if it is found in step SII that the room temperature is lower, then step S12 is performed.
is executed and it is determined whether the difference T3 is larger or smaller than 300, thereby determining whether the degree of low room temperature is 3° C. or more.

As a result, when it is detected that the room temperature TI is 3° C. lower than the set temperature T2, the control of the M circle U5 is moved to step S8, and the stove 1 is automatically started to start heating. On the other hand, if the determination result in step S12 is opposite to the above, and it is detected that the temperature difference T3 is 3° C. or less, the control of the MPU 5 is moved to step S13, and control is performed to postpone starting the stove 1.

That is, by executing the contents of step SI3, the 3-powder timer is activated when the time-up state occurs 30 minutes after startup, which is formed in the software inside the MPU 5, and in the subsequent step S14, the time-up timer is activated. Occurrence will be monitored. Then, after 3 powders, the 30
When the minute timer times out, the determination result in step S14 becomes "YES", and the control of the MPU 5 is transferred to step S8, where the stove 1 is activated and heating is started. In this case, the stop 1 will be forcibly activated after the 30 minutes have elapsed, but as shown by the hot line in the flowchart of FIG. By configuring the program to move to 7:00 a.m. in accordance with this embodiment, the above-described control for determining whether or not to start the stove 1 again can be repeated. can. Additionally, by arranging an air volume sensor or a dew sensing device in the sensor section 8, the MPU 5 can also perform air volume control or emergency fire extinguishing control in the event of an earthquake. As described above, according to the present invention, when performing so-called "good morning timer control" on the heater, it is prohibited to start it immediately if the difference between the room temperature and the desired set temperature is very small. Ineffective heating can be avoided, fuel consumption is saved accordingly, and the provision of such a function does not complicate the control circuit. Therefore, there is almost no increase in product cost, and considering the fact that it is difficult to imagine that an operator in a home would decide on the set temperature after careful consideration every day, the practicality of the present invention is remarkable for home heaters. Become something.

[Brief explanation of the drawing]

FIG. 1 is an external view of the main parts of the stove, FIG. 2 is a block diagram of the control circuit of the embodiment, and FIGS. 3 and 4 are flowcharts. 1...Stove body, 2...Operation unit, 3...Display device,
4...Slide switch, 5...Central control device, 7
...Clock generator. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 timer means, timer setting means, room temperature detector,
a temperature setting means, which automatically starts the heater at a set time and controls the room temperature to be maintained at a predetermined set temperature, comprising: a difference detection means for determining the difference between the room temperature and the set temperature; A control circuit for a heating machine, comprising means for determining whether the difference is larger than or equal to a predetermined value, and means for performing control to extend the activation for a predetermined period when the determining means detects that the difference is small.