JPH04360211A - Method for adjusting temperature of electric carpet - Google Patents

Abstract

PURPOSE:To prevent persons from receiving an unpleasant feeling from an electronic carpet by approaching the once raised temperature of a carpet main body to a set OFF temperature stepwise after starting a power supply. CONSTITUTION:A 1st OFF temperature Tup higher than a set OFF temperature T0 inputted from a set OFF temperature input part 81 only by a prescribed temperature is set up. When a power supply switch S1 is turned on, current supply to a heater 2 is started, and when the temperature of the carpet main body 1 reaches the 1st OFF temperature Tup, a relay contact is opened and the energizing to the heater 2 is interrupted. Then 1st ON temperatures T1 to T3 are calculated as shown in equations I. Thus persons can be prevented from receiving an unpleasant feeling from the carpet.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the temperature of an electric carpet that is spread on a floor and used for heating.

0002

2. Description of the Related Art Conventionally, there has been a hot carpet as a floor heating machine in which the temperature is controlled by turning on and off electricity to a built-in heater. In recent years, it has become common for hot carpets to be used by placing a separate carpet cover over the top of the carpet body containing a built-in heater.

This electric carpet temperature control method has the advantage that electricity costs can be saved because the carpet body is kept warm by the carpet cover.

0004

[Problems to be Solved by the Invention] However, in this method of controlling the temperature of an electric carpet, it takes time for the heat of the carpet body to be transferred to the surface of the carpet cover after the power is turned on. When the carpet cover is thick, there is a problem in that the surface temperature of the carpet cover rises slowly.

[0005] In order to solve this problem, the temperature of the carpet body is temporarily raised higher than the set off temperature immediately after the power is turned on, and as a result, the temperature of the electric carpet is adjusted to perform so-called rapid heating. A method is provided. However, in this hot carpet, the temperature of the carpet body is less likely to drop than the surface temperature of the carpet cover due to the heat retention effect of the carpet cover. Therefore, there were the following problems. That is, the temperature of the carpet body shown in FIG. 5 (solid line)
After rapid heating, the power to the heater is first turned off (indicated by A in Figure 5), and then the power to the heater is turned on, with reference to the change in surface temperature (dotted chain line) of the carpet cover. (Indicated by B in FIG. 5) takes a long time. Therefore, during this time, the surface temperature of the carpet cover decreases (indicated by C in Figure 5).
, which had the disadvantage of causing discomfort to people.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for controlling the temperature of an electric carpet, which solves the above-mentioned technical problems, suppresses the decrease in surface temperature after so-called rapid heating, and does not cause discomfort to people. It is.

[0007]

[Means for Solving the Problems] A method for controlling the temperature of an electric carpet according to claim 1 to achieve the above object,
In addition to controlling on/off the energization to the heater built into the carpet body, the first off temperature Tup, at which the energization to the heater is turned off for the first time after the power is turned on, is set higher than the set off temperature To by a predetermined temperature. This method of adjusting the temperature of an electric carpet is characterized in that the temperature of the carpet body is gradually brought closer to the set off temperature To from the first off temperature Tup.

Further, it is preferable that the N-th turn-on temperature Tn at which the heater is turned on the n-th time after the power is turned on is set based on the following equation. Tn=To+(Tup-To)/(n×k)-Δ
T However, To is the set off temperature, Tup is the first off temperature when power to the heater is turned off for the first time after the power is turned on, k is a constant determined by experiment depending on the electric carpet model, and ΔT is the temperature at which the heater is turned off. This is the difference between the on-temperature at which the heater is turned on and the off-temperature at which the heater is then turned off.

[0009]

[Effect] If you try to lower the first off temperature, which was raised higher than the set off temperature after turning on the power, all at once to the set off temperature, the time that electricity is turned off to the heater will increase, and the surface temperature will increase. However, in the present invention, since the temperature is gradually brought closer to the set off temperature from the first off temperature, the energization to the heater does not remain off for a long time. Therefore, it is possible to suppress the surface temperature from decreasing after rapid heating at power-on.

[0010] Also, at the nth time when the heater is turned on for the nth time,
When setting the turn-on temperature Tn based on the above formula, the second term on the right side of the above formula is (Tup-To)/(n×
k) decreases in stages. Along with this, the temperature at which the heater is turned on is gradually brought closer to the temperature obtained by subtracting the predetermined temperature ΔT from the set off temperature To, that is, the stable on temperature, so that the heater is turned off. It doesn't last long. Therefore, it is possible to suppress the surface temperature from decreasing after rapid heating at power-on. Moreover, since the constant k included in the second term, which determines the degree of decrease in the on-temperature, is experimentally determined depending on the model of the electric carpet, it is possible to adjust the temperature suitable for the model.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples will be explained in detail below with reference to the accompanying drawings showing examples. FIG. 2 is an exploded perspective view of an electric carpet to which a temperature control method according to an embodiment of the present invention is applied, and FIG. 3 is a longitudinal sectional view thereof. Referring to these figures, this electric carpet includes a carpet body 1 having a built-in heater 2 made of a planar heating element, a temperature sensor S made of a heat-sensitive wire for detecting the temperature of this carpet body 1, and this temperature sensor. The carpet includes a controller 3 that controls the temperature of the electric carpet based on a signal from S, and a carpet cover 11 that is placed over the top surface of the carpet body 1.

FIG. 1 is a schematic diagram showing the electrical configuration of an electric carpet. Referring to the figure, heaters 2 include heaters 2a, 2b, and 2c built into each section of the carpet body 1, respectively. It is made up of. AC power from an outlet is supplied to the heater 2 via a power switch S1, a fuse 4, a pair of relay contacts 6 that are opened and closed by a relay coil 5, and a pair of switches 7. The relay contact piece 6 simultaneously cuts off the energization to all the heaters 2a, 2b, and 2c. The switching device 7 selectively energizes at least one of the heaters 2a, 2b, and 2c by switching the contacts 7a, 7b, and 7c using the surface cutting switch S2. Further, the AC power source is connected to a control circuit 8 and a sensor circuit 9 built into the controller 3.
is supplied to. The sensor circuit 9 receives a signal from the temperature sensor S via the sensor block 10 and outputs a signal corresponding to the detected temperature to the control circuit 8.

The control circuit 8 includes a set off temperature input section 81 for inputting the set off temperature To set by the user via the operation switch S3 provided in the controller 1 (see FIG. An energization control section 82 that controls energization to the relay coil 5 to turn on or off the energization is included. Hereinafter, the temperature at which energization to the heater 2 is turned off is simply referred to as an OFF temperature, and the temperature at which energization to the heater 2 is turned on is simply referred to as an ON temperature.

The energization control unit 82 sets the first off temperature Tup after the power is turned on to a predetermined temperature (
For example, set the temperature to a higher value (7°C). Also, heater 2
The difference ΔT between the on-temperature at which energization is turned on and the off-temperature at which energization is then turned off is set to, for example, 2°C. Furthermore, the n-th turn-on temperature Tn is set based on the following equation (1).

[0015]Tn=To+(Tup-To)/(
n×k)−ΔT (1) where k is a constant determined through experiments depending on the model of electric carpet. That is, the surface temperature of the carpet cover 11 is, for example, 0.5 from the first off temperature Tup.
The temperature of the carpet body 1 at the time when the temperature has decreased by °C is determined, and this temperature is substituted as Tn in equation (1) to calculate the constant k. In the above, 0.5°C was set as
This is because a decrease of this level does not cause discomfort to the user. The value of the constant k is, for example, about 1.5 to 7 depending on the thickness, material, etc. of the carpet cover.

Next, the operation of the energization control section 82 will be explained. First, a first off temperature Tup is set which is higher than the set off temperature To input from the set off temperature input section 81 by a predetermined temperature. Then, when the power switch S1 is turned on, power supply to the heater 2 is started, and when the temperature of the carpet body 1 reaches the above-mentioned first off temperature Tup, the relay contact piece 6 is opened and the heater 2 is turned on. Cut off the power to. After that, the first on-temperature T1, T2,... is changed to T
1 = To + (Tup - To) / (1 x k) - ΔT
T2 = To + (Tup - To) / (2 x k) - Δ
TT3=To+(Tup-To)/(3×k)-
ΔT: Calculate as follows. The off-temperature and on-temperature after the first time after the power supply is turned on are shown in Table 1 below.

[0017]

[Table 1]

According to this embodiment, after the power supply to the heater 2 is turned off for the first time, the power supply to the heater 2 is sequentially turned on and off, and after the temperature change becomes stable, the off temperature becomes The on-temperature converges to the set off-temperature To, and the on-temperature converges to a temperature obtained by subtracting the predetermined temperature ΔT from the set off-temperature To. Since the on-temperature is gradually brought closer to the above-mentioned temperature obtained by subtracting the predetermined temperature ΔT from the set off-temperature To, that is, the on-temperature at a stable time, the energization to the heater 2 does not remain off for a long time. Therefore, it is possible to suppress the surface temperature from decreasing after rapid heating at the time of turning on the power supply, and it is possible to prevent people from feeling uncomfortable.

Furthermore, the constant k included in (Tup-To)/(n×k), the second term on the right side of the above equation, which determines the degree of fall in the on-temperature, can be found through experiments depending on the type of electric carpet. This makes it possible to adjust the temperature to suit the model. <Test example> The set off temperature To is 30°C, the first off temperature is 37°C, the difference ΔT between the on temperature and off temperature when the temperature is stable is 2°C, and the constant k is 3. When the surface temperature of the carpet cover 11 was measured after adjustment, the results shown in FIG. 4 were obtained. However, in the figure, the temperature detected by the temperature sensor S, that is, the temperature of the carpet body 1, is shown by a solid line, and the surface temperature of the carpet cover 11 is shown by a chain line. Note that the room temperature during the experiment was 17°C.

As shown in FIG. 4, it was demonstrated that after rapid heating, the surface temperature did not drop and stabilized quickly.

[0021]

As described above, according to the method for controlling the temperature of an electric carpet according to claim 1, the temperature of the carpet body that has been started up is brought closer to the set off temperature in stages after the power is turned on, so that the temperature of the heater can be adjusted gradually. The OFF state does not continue for a long time, and therefore, the decrease in surface temperature after rapid heating can be suppressed, and no discomfort is caused to people.

Furthermore, according to the method for adjusting the temperature of an electric carpet according to the second aspect, since the degree of decrease in the on-temperature is determined depending on the model of the electric carpet, it is possible to adjust the temperature according to the model.

[Brief explanation of drawings]

FIG. 1 is an electrical configuration diagram of an electric carpet to which the temperature control method of the present invention is applied.

FIG. 2 is an exploded perspective view of the electric carpet.

FIG. 3 is a longitudinal cross-sectional view of the electric carpet.

FIG. 4 is a diagram showing changes in the temperature of the carpet body and the surface temperature of the carpet cover.

FIG. 5 is a diagram showing changes in the temperature of the carpet body and the surface temperature of the carpet cover according to a conventional control method.

[Explanation of symbols]

1 Carpet body 2 Heater Tup 1st off temperature To Set off temperature Tn Nth turn-on temperature

Claims (2)

[Claims] [Claim 1] Controls on/off the energization to the heater (2) built into the carpet body (1), and also controls the first off temperature Tup at which the energization to the heater (2) is turned off first after the power is turned on. , in a method of adjusting the temperature of an electric carpet in which the temperature is set higher than the set off temperature To by a predetermined temperature, the temperature of the carpet body (1) is gradually brought closer to the set off temperature To from the first off temperature Tup. A temperature control method for electric carpets featuring: 2. In the electric carpet temperature control method according to claim 1, the heater (2) is turned off at the nth time after the power is turned on.
A method for adjusting the temperature of an electric carpet, characterized in that the Nth turn-on temperature Tn at which the carpet is turned on is set based on the following formula. Tn=To+(Tup-To)/(n×k)-Δ
T However, To is the set off temperature, Tup is the first off temperature when the power to the heater is turned off for the first time after the power is turned on, k is a constant determined by experiment depending on the electric carpet model, and ΔT is the heater ( It is the difference between the on temperature at which the power supply to heater (2) is turned on and the off temperature at which the power supply to the heater (2) is then turned off.