JPH0789511B2 - Temperature control device for sheet heating element - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature control device for a planar heating element capable of comfortable heating without being affected by the presence or absence of a cover.

(Prior Art) In a planar heating element such as an electric carpet, there has been proposed a sheet heating element that eliminates the effect of a user's feeling of a temperature difference due to high and low ambient temperatures and enables comfortable temperature control. Its contents are known from Japanese Patent Publication No. 57-61281.

This is a configuration in which the set temperature is corrected to a low level according to the level of the room temperature, and the energization to the heating element is controlled so that the temperature of the heating element matches the corrected set temperature.

(Problems to be solved by the invention) Recently, without directly using the electric carpet,
Covers are often used to prevent dirt and damage on the surface side, but covers that are now in widespread use have a relatively thick material such as polyurethane sheets as the base material, unlike sheets such as cotton cloth. Needless to say, the seat temperature felt by a person sitting on the carpet is naturally different between when the cover is attached and when the cover is not attached.

Therefore, even if the above-mentioned known device capable of adjusting the set temperature in response to the change in the room temperature is used, it is impossible to deal with the presence or absence of the cover, and it is necessary to further correct the set temperature. The fact is that no sheet heating element that can meet the demand has been provided yet.

By the way, at first glance, it seems that the set temperature should be set slightly higher when the cover is attached,
The temperature sensor that detects the temperature of the heating element is deeply provided inside the carpet layer, and the set temperature is the total temperature of the carpet against the sitting temperature (the temperature actually felt by the human body) at the limited place where the user is seated. Whether the cover is used or not, because it specifies the average temperature of the heat generating part under the temperature distribution condition in the area, so that it is not possible to obtain good results simply by performing a constant value temperature correction. It is difficult to easily realize a device that enables comfortable control by eliminating the seat temperature due to the fact that the demand has not been met until now.

In view of such an actual situation, the present invention has been devised to solve the conventional problem, and in particular, depending on whether the cover is attached or not, the operation of the changeover means such as the changeover switch causes By automatically correcting the set temperature under conditions suitable for each condition, the influence of the room temperature difference and the seat temperature difference due to the presence or absence of the cover is eliminated, and stable and comfortable heating is always maintained. That is the object of the invention.

(Means for Solving Problems) However, according to the present invention, as is clear from FIG. 1 which clearly shows the configuration, a sheet-like heating element (1) detachably provided with a cover (6) attached to the surface thereof. As the temperature control device of (1), heat generation temperature detection means (7), room temperature detection means (8), first temperature setting means (9), second temperature setting means (10), switching means (11), It is characterized by being constituted by a temperature judgment means (12) and a control means (13).

The heat generation temperature detection means (7) detects the temperature of the heating element (2) of the planar heating element (1) and emits an electric signal corresponding to the temperature.

The room temperature detecting means (8) detects the temperature in the room where the sheet heating element (1) is installed and generates an electric signal corresponding to the temperature.

The first temperature setting means (9) generates an electric signal corresponding to the set temperature of the heating element (2) as an electric signal having a linear function relationship with a negative coefficient according to the level of room temperature.

The second temperature setting means (10) has a larger level and a greater degree of change in the electric signal corresponding to the set temperature of the heating element (2) than the first temperature setting means (9) according to the room temperature. It is generated as an electrical signal based on a linear function relationship of coefficients, that is, a correction curve having a different gradient from that of the first temperature setting means.

The switching means (11) is used when the cover (6) of the first and second temperature setting means (9) and (10) based on the correction curves having different slopes depending on the presence or absence of the cover is not attached. Selects the first temperature setting means (9), and when installed, selects the second temperature setting means (10) and operates them respectively.
It is connected to the room temperature detecting means (8) so that the electric signal generated by the detecting means (8) is inputted.

The temperature determination means (12) is provided when the generated electric signal of the heat generation temperature detection means (7) is larger than the generated electric signal of the selected first temperature setting means (9) or second temperature setting means (10). Generates an off signal, and when small, generates an on signal.

The control means (13) operates so that the heating element (2) is energized by the ON signal generated by the temperature determination means (12) and is deenergized by the OFF signal. A transistor is suitable.

(Operation) In the present invention, the first temperature setting means (9) or the second temperature setting means (10) can be operated only by a simple manual operation of automatically operating the switching means (11) or manually switching. It is possible to perform a proper temperature correction based on the correction curves having different gradients depending on the room temperature difference and the presence or absence of the cover to maintain the sitting temperature in a comfortable state.

(Examples) Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows a sheet heating element (1), for example, an electric carpet, wherein a heating element (2) is formed by arranging heating wires in a zigzag plane, and a linear heat-sensitive element is provided in the heating element (2). The temperature sensor (3) formed in close proximity to the lower part of the sheet is sandwiched between the back surface material (4) and the surface material (5) to form an integrally formed thick sheet.

The sheet heating element (1) is provided with a cover (6), which is placed on the surface material (5) in an overlapping manner, as a detachable accessory.

An electric circuit for controlling the temperature of the sheet-like heating element (1) having the above structure is shown in FIG. 3, but a high-voltage control circuit for connecting a 100-volt power source and the heating element (2) and heat generation. It is equipped with a low-power control circuit that automatically adjusts the power supply to the body (2).

The high-voltage control circuit includes a relay (1
4) A switch (15) for switching and using the heating element (2) on the entire surface or a half surface, a power switch (16), a protective temperature fuse (17), and an indicator lamp (18).

On the other hand, the light-electricity control circuit has the temperature sensor (3) as a detection unit, and generates heat signals in response to the average temperature of the heat generating element (2). A room temperature detecting means (8) for generating an electric signal corresponding to room temperature and a switch as the switching means, which has a protective electrode (18) provided for detecting electric leakage and a temperature sensor (19) for detecting room temperature as detecting parts. (11) as an input element, and a microcomputer for processing signals from these input elements (hereinafter referred to as a microcomputer) (2
4) is equipped with a control circuit body composed of a scanner (22) and an A / D converter (23) for processing an analog signal generated from each of the input elements, and an output port of a microcomputer (24) The monitor lamps (25A to 25C) and the solenoid (14s) of the relay (14) are connected to the control lamp for ON / OFF control of the relay (14) and display of each operating state.

Therefore, the microcomputer (24) includes the first temperature setting means (9) and the second temperature setting means (1) among the components of the present invention.
0), a temperature control means corresponding to the temperature determination means (12) and the control means (13), which is an input port, an output port, a read-only memory (ROM), an arbitrary access memory (RAM)
And a central processing unit (CPU), the programs written in the ROM and RAM are shown in a flow chart as shown in FIG. 4, and the similarly written data are shown in a diagram. This is as represented by lines (I) and (II) in FIG.

Next, the operation of the apparatus of the present invention will be described with reference to FIGS. 3 and 4. When the power switch (16) is turned on and the changeover switch (15) is operated appropriately, the first temperature setting means (9) or the second temperature setting means (9) Since the temperature of the heating element (2) is lower than the set temperature set by the temperature setting means (10), the microcomputer (24) issues an output for excitation to the solenoid (14s) of the relay (14), and the relay Since the (14) is closed, the heating element (2) is energized and the temperature gradually rises.

The microcomputer (24) reads the temperature (T _H ) and room temperature (T _R ) of the heating element (2) detected by the detection means (7) and (8) periodically for a predetermined time (A), and then switches. Means (11)
Check which switch the switch (11) is being operated for. If, for example, the cover (6) is not attached and the switch is off, the room temperature (T _R ) will have a preset upper limit value ( T _R1, determines higher or lower than, for example 25 ℃) (c).

If the result of this determination is T _R ≧ T _R1 , the room temperature (T _R ) is set to T _R1 (25
(T), and if T _R <T _R1 , then make a comparison judgment with a preset lower limit (T _R2 , for example 15.8 ° C.) (E).

If the judgment result at this time is T _R > T _R2 , the room temperature (T _R ) is used as the actual value for the next calculation, while T _R ≤T _R2
Then, room temperature (T _R ) is fixed at T _R2 (15.8 ° C) (f).

It should be noted that, in this judgment, if the selected temperature of the heating element (2) is lowered when the room temperature is high, the heating is not effective, while if the temperature of the heating element (2) is extremely raised when the room temperature is low. Since there is a danger of overheating, the upper and lower limits are set in consideration of this point.

Thus, when the room temperature (T _R ) is T _R2 <T _R <T _R1 , the CPU calculates and corrects the set temperature corresponding to the first temperature setting means (9) (g).

That is, the formula for calculating the _OFF control temperature point (T _OFF ) corresponding to the line (I) in FIG. 7, T _OFF = −f · T _R + A (A), where f = 1.2 A = 63 On the basis of the above, the reference set temperature is determined according to the linear function having a negative coefficient according to the room temperature.

In this case, as described above, the lower limit value of T _R (T _R2 = 15.8
℃) and the upper limit (T _R1 = 25 ℃) have been determined.
The upper and lower limits of _OFF are 44 ° C and 33 ° C, respectively. Within this temperature range, the temperature (T _H ) of the heating element (2) is set low when room temperature is high, and conversely it is set high when it is low. is there.

When T _OFF is determined as described above, ON control temperature point (T _ON )
Is calculated by T _ON = T _OFF −C ・ ・ ・ (B), but C = 2.5 ℃ (Differential) ( _H ), and the detected temperature (T _H ) of the heating element (2) is read out. After (i), temperature judgment corresponding to the temperature judgment means (12) is performed (nu).

If the result of this temperature judgment (nu) is T _H <T _ON , an ON signal is issued, and if T _H > T _OFF , an OFF signal is issued.

By turning on / off the transistor, which is connected in series with the solenoid (14s) of the relay (14), for example, by turning on / off the ON / OFF signal, the power supply to the heating element (2) is controlled to be turned on / off. It is possible to keep the body (2) at the set temperature determined by the first temperature setting means (9).

On the other hand, when the cover (6) is attached and the switch (1
If 1) is on, the room temperature (T _R )
Is higher or lower than the upper limit ( _TR1 , for example, 25 ° C) (C).

If the result of this determination is T _R ≧ T _R1 , the room temperature (T _R ) is set to T _R1 (25
C)) (D), and if T _R <T _R1 , then a comparison is made with a preset lower limit value (T _R3 , eg 17.3 ° C.) (L).

If the determination result at this time is T _R > T _R3 , the room temperature (T _R ) is used as the actual value for the next calculation, while T _R ≤
If it is T _R3 , room temperature (T _R ) is fixed at T _R3 (17.3 ° C).

Thus, when the room temperature (T _R ) is T _R3 <T _R <T _R1 , the CPU calculates the correction of the set temperature corresponding to the second temperature setting means (10) (wa).

That is, the calculation formula of the _OFF control temperature point (T _OFF ) corresponding to the line (II) in FIG. 7, T _OFF = −g · T _R + B (B), where g = 2.2 B = 89 Based on the temperature of the room, the first temperature setting means (9)
In comparison with the above case, the reference set temperature is determined by the relationship of the linear function of the negative coefficient under the condition that the level is large (B> A) and the degree of change is large (g> f).

Also in this case, since the lower limit of _{T R (T R3 = 17.3 ℃} ) and the upper limit value (T _R1 = 25 ℃) is determined, the upper limit value and the lower limit value of T _OFF are each 51 ° C. and 34 ° C. Therefore, the temperature (T _H ) of the heating element (2) is low when the room temperature is high in this temperature range.
Conversely, if it is low, it will be automatically set to a high value.

After that, the ON control temperature point (T _ON ) is calculated ( _H ), the detected temperature (T _H ) of the heating element (2) is read (R), and the temperature judgment ( _N ) is performed with the cover (6) attached. It is similar to that when there is no.

As described above, the reference temperature of the heating element (2) is set higher when the cover (6) is attached as shown in FIG. Moreover, the temperature difference between the set temperatures (ΔT) is smaller when the room temperature is higher, and becomes 1 ° C (minimum) at 25 ° C.
On the other hand, when the room temperature is as low as 8.7 ° C (maximum) at 17.3 ° C, it becomes larger, and when the sitting temperature, which is the sensible temperature when actually sitting on the carpet, was measured, as shown in Fig. 7. The temperature values are almost the same regardless of the presence or absence of the cover (6), and good results are obtained in which all the conditions are included in the comfortable temperature range (L), and thus comfort control is realized. It was

In the example described above, the changeover means (11) is applied to a manual changeover switch, but the present invention may be an automatic device for automatically operating the changeover means (11). In the case of the example, as shown in FIG. 5, the cover (6) is provided at two positions apart from each other on the front side of the electric carpet (1).
Cover sensor (26
- _{1), (26-2)} were respectively attached, both sensors (26
- _{1), (26-2)} cover detection circuit a detection signal (27-
_{1), (27-2)} were circuitry configured to send to each via the scanning device (22), the cover sensor (26- _1), (26
- ₂₎ when issuing the actuated signal by the mounting of both the cover (6), switching means taking a logical product of both signals (11)
To the side where the cover is attached, and
- _{1), (26-2)} at least one may be to actuate the switching means (11) to cover the non-mounting side when not actuated (see FIG. 6).

Incidentally, the cover sensor (26- _1), the (26 - _2), an optical sensor such as a phototransistor of CdS may be mentioned as preferred.

(Effects of the Invention) As described above, the present invention changes the set temperature of the heating element (2) with respect to room temperature depending on whether the cover (6) is attached or not, and the cover is also provided. The set temperature when (6) is attached is corrected to a value that has a large degree of change with respect to room temperature and a large level, and correction curves with different slopes are provided, so that the user actually feels it. It is possible to stably maintain the sitting temperature at a comfortable temperature regardless of whether the cover (6) is attached or not, and the comfortable heating control can be surely and easily realized, which is very convenient for the user. The effect is played.

[Brief description of drawings]

FIG. 1 is a block diagram clearly showing the constitution of the present invention, FIG. 2 is a schematic structural diagram of a planar heating element according to one embodiment of the present invention, and FIG.
FIG. 4 is an electric circuit system diagram according to an example of the present invention, FIG. 4 is a flowchart showing a control mode of the present invention, and FIGS. 5 and 6 correspond to an electric circuit partial diagram and switching means according to an embodiment of the present invention. FIG. 7 is a diagram showing the relationship between the sitting temperature of the heating element and the set temperature with respect to the room temperature in the present invention. (1) …… Sheet heating element, (2) …… Heating element, (6) …… Cover, (7) …… Heating temperature detecting means, (8) …… Room temperature detecting means, (9) …… No. 1 temperature setting means, (10) ... second temperature setting means, (11) ... switching means, (12) ... temperature determination means, (13) ... control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-109478 (JP, A) Actually open 57-15096 (JP, U) Actually open 61-54114 (JP, U) Actual public 51- 40895 (JP, Y1)

Claims (1)

[Claims] 1. A planar heating element (1) having a cover (6) attached to the surface thereof, which is detachably provided, for detecting the temperature of the heating element (2) and generating an electric signal corresponding to the temperature. Heating temperature detecting means (7), room temperature detecting means (8) for detecting room temperature and generating an electric signal corresponding to the temperature, temperature setting means for generating an electric signal corresponding to the set temperature, and the heating temperature Temperature determination means (12) for generating an off signal when the generated electric signal of the detection means (7) is larger than the generated signal of the temperature setting means, and for generating an on signal when the electric signal is smaller than the generated signal of the temperature setting means.
And a control means (13) for energizing the heating element (2) by the ON signal and interrupting the energization by the OFF signal, in the temperature control device corresponding to the set temperature as the temperature setting means. First temperature setting means (9) for generating an electric signal as a linear function electric signal having a negative coefficient depending on the room temperature, and an electric signal corresponding to the set temperature according to the room temperature. The second temperature setting means (10) which is generated as an electric signal having a negative coefficient linear function relationship having a greater level and a greater degree of change than the one temperature setting means (9) is provided, and the cover (6) is attached. A switching means (11) for selectively operating the first temperature setting means (9) when not installed, and the second temperature setting means (10) when installed for connecting to the room temperature detecting means (8). Is equipped with Temperature control device for a planar heating element to.