JPH04315786A - Electric carpet - Google Patents

Abstract

PURPOSE:To provide warmth regardless that whether there is a cover or not by correcting the temperature setting using a room temperature, a power supply voltage value, and time- based change information about an amount of signals in a temperature detecting wire at electrification initial stage and after the electrification start, in a carpet main body in which a heat-sensitive heater wire, being integral with a heating wire and a temperature detecting wire, being provided in a plane shape. CONSTITUTION:A temperature information input from a smoothing circuit 3 to an arithmetic and control part 12 is compared with a set temperature information set inside the arithmetic and control part 12 to perform off-operation is the input information has been raised. Further, a room temperature reading and processing circuit 13 and a voltage reading and processing circuit 15 are provided in order that the prodcessing operation of the arithmetic and control part 12 can correct the temperature setting, based on a room temperature, a power supply voltage, and a temporal change information of a temperature detection information. The temperature setting is corrected by using a room temperature, a power supply voltage value, and time-based change information about an amount of signals in a temperature detcting wire at electrification initial stage and after the electrification start, in a carpet main body in which a heat-sensitive heater wire 11, being integral with a heating wire and a temperature detecting wire, being provided in a plane shape.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric carpet whose surface temperature does not easily decrease even when a cover material is placed on the surface of the electric carpet body to prevent stains and improve interior design.

0002

[Prior Art] Surface heating devices such as electric carpets consume a relatively large amount of power, so temperature control is
On-off control using a relay is generally implemented as shown in Japanese Patent No. 917 and the like. There are various methods for on-off control, but the principle is as follows.

That is, the temperature rise of the heating element is detected by the temperature sensor characteristic of the heat-sensitive heating wire (negative characteristic thermistor) as shown in FIG. 9, and when the temperature rises to the adjustment temperature, the relay is turned off to stop the heating. When the temperature of the heat-generating material drops, the relay is turned on again to generate heat, thereby controlling the temperature at a constant level. Additionally, the temperature could be adjusted to achieve the desired temperature.

FIG. 10 shows the configuration of a conventional temperature control device that performs on-off control as described above. The sensor voltage Va from the sheet heating element 2 is amplified by an amplifier circuit 10,
The signal is input to the switching circuit 4 via the smoothing circuit 3, drives the relay drive circuit 8, turns on the relay contact S1, and generates heat. When the temperature reaches a certain level, relay contact S1
is turned off. Note that after the relay is turned off, the off-time timer 6 turns the relay on again.

[0005]

[Problems to be Solved by the Invention] However, the above-described temperature control has the following problems. In other words, the maximum temperature of the electric carpet itself is fixed, so
Depending on the type of covering material for electric carpets that the user arbitrarily selects and uses, especially if the covering material has high heat insulation properties, the surface temperature of the cover may drop significantly, leading to a problem of insufficient heating capacity. Ta.

[0006] The maximum temperature setting for an electric carpet is such that there is little risk of low-temperature burns, and when a cover is not used over the electric carpet, a relatively small area of insulating material such as a cushion is placed, and the room temperature is low. Cover material is used because there are restrictions in terms of ensuring reliability such as the heating element temperature of the insulation part and the safety of the temperature sensor made of plastic thermistor material and heat aging in high temperature range when used in low temperature conditions. This is because it is necessary to determine the maximum temperature setting based on the conditions when the temperature is not set.

However, the above-mentioned conventional problem of low-temperature burns and partial insulation causes the heating element temperature and temperature sensor temperature in the partially insulated part to be affected when the user actually places the covering material on top of the electric carpet. If you leave it on and use it, the temperature will drop and it will be safe. In other words, temperature control is performed according to the temperature sensor characteristics as shown in Figure 9, so when partial insulation occurs, the temperature in the insulated part (b) and the temperature in the non-insulated part (c) will vary with respect to the uniform temperature across the entire surface (a). Since the temperature control operation is performed with the same impedance value, when the cover material is placed, the temperature of the non-insulated part (c) will be higher than when there is no cover, and therefore the maximum temperature (b) will be the same. In this case, it is possible to raise the set temperature to point (A) compared to the maximum temperature setting for the entire surface (A') when no cover material is placed.

[0008] In addition, in another example [JP-A-2-129882] that automatically corrects the presence or absence of a cover material, the occurrence of partial insulation is not taken into consideration, and the Combined use, misjudgment [It is determined that a cover is placed even though it is not, and the setting is increased, which is dangerous. ) has a problem of poor reliability.

[0009] The present invention has been provided in view of the above-mentioned points, and an object of the present invention is to automatically correct the set temperature and achieve almost the same level of warmth with or without a cover. The company provides electric carpets with

0010

[Means for Solving the Problems] The present invention provides a carpet body in which a heat-sensitive heat-generating wire that is integrated with a heat-generating wire and a temperature detection wire is disposed in a planar manner, and a temperature detection line for detecting room temperature, power supply voltage value, and temperature at the initial stage of energization. and temperature control means for correcting the temperature setting based on the temperature and time change information of the signal amount of the temperature detection line after the start of energization.

Further, the amount of correction for temperature setting is determined using fuzzy theory.

0012

[Function] By correcting the temperature setting based on the room temperature, the power supply voltage value, the temperature of the temperature detection line at the initial stage of energization, and the time change information of the signal amount of the temperature detection line after energization starts, the cover is removed. In addition, the correction factor is determined based on the amount of information when starting from a low temperature, where the amount of temperature information is less likely to be distorted due to the use of partial insulation, etc. The accuracy of determining the correction amount is increased.

[0013] Furthermore, since a fuzzy rule is applied to the calculation of the correction factor, it is possible to realize correction according to the insulation performance, and with other methods, the amount of correction may become abnormal if the input sensor information contains noise. However, since fuzzy rules produce an average answer from multiple rules, they are resistant to noise and can easily achieve corrections that are almost as expected. It is easier than mathematical formula processing or statistical processing.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is based on the temperature control operation for the sensor characteristics described above, and the time of the signal amount of the temperature sensor is determined based on the room temperature, the power supply voltage value, and the temperature of the temperature detection line immediately after energization, especially at the start of energization from a low temperature state. This focuses on the fact that the pattern of change (until the first off operation) is significantly different between when the cover is placed and when it is not placed.

That is, if the cover material is not placed, based on the amount of information described above (room temperature, power supply voltage value, temperature detection line information immediately after energization, and time change in the signal amount of the temperature sensor until it is turned off for the first time). Automatically adjusts the setting up to the positive side for the maximum temperature setting based on The aim is to create an electric carpet that is safe and reliable even when not in use.

Here, the correction amount is determined based on the temperature information of the temperature detection line at the initial stage of energization and the amount of time change in the amount of temperature sensor information until the first power-off. This is because such occurrences (no uniform temperature over the entire surface) cannot be avoided, and after a period of time has passed after electricity is applied, it is difficult to distinguish whether the occurrence is due to the presence or absence of a cover or partial insulation.

[0017] Furthermore, if the amount of correction for the maximum temperature setting is determined using fuzzy theory, the amount of correction can be selected in accordance with the insulation performance of the cover material, which varies depending on the type of cover material arbitrarily selected by the user. Furthermore, since the correction amount is determined using a plurality of rules, it is possible to realize an electric carpet in which an abnormal correction amount is not calculated. With the above configuration, the occurrence of partial insulation, which is not taken into consideration in other examples [JP-A-2-129882] that automatically corrects the presence or absence of the cover material, the possibility of using it together with other heating equipment, or making mistakes. judgement〔
It will judge that a cover is placed even though it is not actually there, and the settings will be updated, which could be dangerous. ] can be performed with high reliability, and at least an electric carpet can be realized in which the set temperature can be corrected according to the heat insulation properties of the cover material without the possibility of misjudging that the cover is placed even when it is not.

FIG. 4 shows a sectional view of a carpet body in which the heat-sensitive heating wire shown in FIG. 5 is arranged. Figure 6 shows the impedance-temperature characteristics (Figure 9
) detected by the temperature control circuit (Figure 2)
- Shows the relationship between temperature characteristics. As shown in FIG. 4, the electric carpet, that is, the carpet main body, has a heat-sensitive heating wire 11 disposed inside a backing material (insulating material) 21, and a surface material 23 and a cover material on the front side through a heat-uniforming sheet 22. 24 are provided.

As shown in FIG. 5, the thermosensitive heating wire 11 has a heating sensor H1 made of metal foil on the outer periphery of an insulating core yarn b.
A temperature detection electrode S1 made of metal foil is spirally wound around the outer periphery of a plastic thermistor material Z having temperature/impedance characteristics as shown in FIG. Further, the outer periphery is covered with an insulating coating c.

When the thermosensitive heating wire 11 is connected as shown in FIG. 2, as shown in FIG. 6, the sensor voltage Va exhibits a characteristic that increases as the temperature rises. In FIG. 2, one end of the heat generating line H1 of the thermosensitive heat generating line 11 is connected to the commercial power source 1 via a relay contact R1. In addition, heat-sensitive heating wire 1
One end of the temperature detection electrode S1 of 1 is connected to the other end of the heating wire H1, and the other end of the temperature detection electrode S1 is connected to the bias circuit 7.
It is connected to the amplifier circuit 10 and the smoothing circuit 3, and a value corresponding to a sensor voltage value according to temperature characteristics is read into an arithmetic control section 12 made up of a microcomputer.

The temperature information input from the smoothing circuit 3 to the arithmetic control section 12 is compared with the set temperature information amount provided inside the arithmetic control section 12, and if the input temperature information becomes higher, the relay is driven. Relay contact R1 is opened via circuit 8 to turn it off. Furthermore, although the processing operation of the arithmetic control unit 12 will be described later, in the present invention,
A room temperature reading processing circuit 13 and a voltage value reading processing circuit 15 are provided so that the temperature setting can be corrected based on the time change information of the room temperature, the power supply voltage, and the amount of temperature detection information.

Further, the heating capacity level selected by the user is read into the calculation control unit 12 from the heating capacity selection selection circuit 14, and is determined for each heating capacity level provided inside the calculation control unit 12. It has a timer control function that opens and closes the relay according to the on and off times. Furthermore, the symbol A/D displayed at the input terminal of the arithmetic control unit 12 indicates an A/D conversion function for performing mathematical formula processing in the arithmetic control unit 12 depending on the amount of input information.

Here, FIG. 3 shows the increase in sensor voltage over time when the electric carpet shown in FIG. 4 is turned on from a low temperature to generate heat. As shown in the figure, the speed at which the sensor voltage increases varies depending on the presence or absence of a cover and the insulation properties of the cover material. This is because the cover material has heat insulating properties and thus acts to hinder heat dissipation.

Various methods can be considered to distinguish the difference in the rising speed of the sensor voltage (Va) shown in FIG. is possible. ■Time from low temperature start to first off operation T1, T2, T
3. ■Sensor voltage Va just before the first off operation
Incremental values ΔV1, ΔV2, ΔV3 per unit time of
etc. have high discrimination accuracy.

[0025] Furthermore, the above-mentioned T1 to T3 and ΔV1 to
ΔV3 is the amount of information from a low-temperature start to the first power-off.When starting from a high-temperature temperature, the electric carpet is used to warm the vehicle, and the power is turned off and then turned on again. This is because the discrimination accuracy decreases if the temperature is too high to use an electric carpet or if the room temperature is so high that it is not necessary to use an electric carpet.

[0026] Also, the reason why the sensor voltage Va is not set until the first time is turned off is that from the second time onwards, if there is another insulating material such as a cushion placed on the surface, the increase in the sensor voltage Va will not be uniform. It is for this purpose. In addition, the speed at which the sensor voltage rises is also affected by the room temperature when the power is turned on, and variations in the amount of heat generated due to fluctuations in the power supply voltage, so it is recommended that the speed at which the sensor voltage rises is corrected based on the amount of information about the room temperature and power supply voltage. , a more accurate maximum temperature setting can be corrected.

FIG. 1 shows an example of a basic flowchart showing the operation of a microcomputer related to temperature control in the embodiment, and examples of fuzzy rules for calculating a correction factor for temperature setting are shown below. That is, this is an example of a fuzzy rule that calculates the setting correction rate R for each type of cover based on the setting without a cover. In addition, D2 is the room temperature, D1 is the power supply voltage, and T
ON is the time until the first OFF, and R is the set correction rate.

Rule ■ If D2 is high and D1
is high and TON is long, R is made small. Rule ■ If D2 is high, D1 is high, and TON is short, increase R slightly. Rule ■ If D2 is low, D1 is high, and TON is long, reduce R slightly.

Rule ■ If D2 is low and D1
If R is high and TON is short, R should be increased slightly. Rule ■ If D2 is high, D1 is low, and TON is long, reduce R slightly. Rule ■ If D2 is high, D1 is low, and TON is short, increase R slightly.

Rule ■ If D2 is low and D1
If R is low and TON is long, R should be slightly reduced. Rule ■ If D2 is low, D1 is low, and TON is short, R is made large. Here, Table 1 is another example of the fuzzy rule, where ΔV is the rate of change in the sensor voltage before the first off.

[0031]

[Table 1]

FIG. 1 is an example of a basic flowchart showing the operation of the microcomputer involved in temperature control in the above-described embodiment. After performing initial settings and reading the previous temperature setting correction factor R in step 1, in step 2 output terminal R0 is set to high level and relay contact R1 is turned on, and in step 3 the sensor immediately after energization is applied from input terminal D1. Load the information DS. In step 4, it is determined whether the start is from a low temperature based on the value of DS, and if it is a start from a low temperature, in step 5, the first off operation is performed at the highest set temperature without a cover, level D0, regardless of the user's selection. After setting the room temperature information D2 in step 6,
In step 7, power supply voltage information D3 is read.

[0033] Then, in step 9, the on-time is measured, and this on-time counter is later used to calculate the amount of change in temperature information over time (calculating the time until the first off, the rate of change in the sensor voltage value just before the off, etc.) used for. In step 10,
Determine whether the highest set level of no cover has been reached;
If the maximum setting has not been reached, the process returns to step 6, and if the maximum setting has been reached, the relay is turned off in step 11.

After turning off the relay, step 1
In step 2, calculate the temperature setting correction rate R using the fuzzy rules shown above or in Table 1 from the above-mentioned D2 and D3 information and the time change information of the temperature sensor information, and if it differs from the initial setting value, update it. and update in step 13,
After the off time has elapsed in steps 14 and 15, the process returns to step 2 and the relay is turned on again to start generating heat. In step 4, it is determined that the start is not from a low temperature, so step 16 Move to the side.

After confirming the setting level selected by the user in step 16, correction is made to the setting level selected by the user in step 17, temperature information is read in step 18, and the setting level is set to off level in step 19. Determine whether it has been reached and if the off level has not been reached, step 1
Go back to step 8 and if off level is reached step 20
After the relay is turned off, the process moves to steps 14 and 15.

FIG. 1 is a basic flowchart, and step 4 is to count the number of times the relay is turned on and to improve the accuracy of determining whether or not the start is from a low temperature by ANDing the value of DS and the number of times the relay is turned on = 1. It is also possible to do so. Note that the calculation control section 12 constitutes a temperature control means. In addition, the correction factor R can be stored in a non-volatile memory, read out at the initial setting, and rewritten with a new amount of information each time a start is made from a low temperature, so that it can also be corrected when restarting from a high temperature state. It is possible.

Further, FIGS. 7 and 8 show other embodiments of the present invention. In the above example, a heat-sensitive heating wire was explained, but a heater H1 as a heating wire and an electrode as shown in FIG. Similar processing can be performed even if temperature detection lines S made of S1, S2 and a plastic thermistor Z are provided separately. In this case, the temperature detection line S is connected via a dividing resistor R2. In the case of Figure 7, the relationship between sensor voltage Va and temperature is as shown in Figure 8.
The trend is the opposite, so you can reverse the logic.

[0038]

Effects of the Invention As described above, the present invention provides a carpet body in which a heat-sensitive heat-generating wire that integrates a heat-generating wire and a temperature detection wire is disposed in a planar manner, and a temperature detection line that detects room temperature, power supply voltage value, and temperature at the initial stage of energization. Since the device is equipped with a temperature control means that corrects the temperature setting based on the temperature of By correcting the temperature setting based on the temperature and time change information of the signal amount of the temperature detection line after the start of energization, it is possible to achieve almost the same level of warmth with or without a cover, and also to improve the correction rate. The determination of the amount of correction is limited to the amount of information at the time of starting from a low temperature, where the amount of temperature information is unlikely to be distorted due to the use of partial insulation, etc., thereby achieving a high accuracy in determining the amount of correction.

Furthermore, since fuzzy rules are applied to the calculation of the correction factor, it is possible to realize correction according to the insulation performance, and with other methods, the amount of correction may become abnormal if the input sensor information contains noise. However, since fuzzy rules produce an average answer from multiple rules, they are resistant to noise and can easily achieve corrections that are almost as expected. It is also simpler than mathematical formula processing and statistical processing.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a basic flowchart of an embodiment of the present invention.

FIG. 2 is an overall block diagram.

FIG. 3 is a diagram showing a change in sensor voltage over time when the power is turned on from a low temperature.

FIG. 4 is a cross-sectional view of the electric carpet.

FIG. 5 is a perspective view of a main part of a heat-sensitive heating line.

FIG. 6 is a diagram showing the relationship between temperature and sensor voltage.

FIG. 7 is a circuit diagram of a main part of a type in which a heat generation line and a temperature detection line are separated.

8 is a diagram showing the relationship between sensor voltage and temperature in the case of FIG. 7. FIG.

FIG. 9 is a diagram showing the relationship between temperature and impedance of a temperature sensor.

FIG. 10 is a circuit diagram of a conventional example.

[Explanation of symbols]

11 Heat-sensitive heating wire 12 Arithmetic control section

Claims (3)

[Claims] Claim 1: A carpet body in which a heat-sensitive heating wire, which is an integrated heating wire and a temperature detection wire, is arranged in a planar manner, a room temperature, a power supply voltage value, the temperature of the temperature detection wire at the initial stage of energization, and the temperature after the start of energization. An electric carpet characterized by comprising temperature control means for correcting a temperature setting based on time change information of a signal amount of a detection line. 2. A heat-sensitive heating element according to claim 1, wherein a heat-sensitive heating element is constituted by a heat-generating wire and a temperature detection line that is provided substantially parallel to the heat-generating wire and detects the temperature of the heat-generating wire. electric carpet. 3. The electric carpet according to claim 1, wherein the amount of correction for temperature setting is determined by fuzzy theory.