JP3022892B2 - Electric carpet control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric carpet, and more particularly to a control device for determining the presence / absence of a user and controlling the energization.

[0002]

2. Description of the Related Art An electric carpet used as a floor heating device is provided with a heating wire and a heat sensing wire whose impedance changes in accordance with temperature substantially in parallel with the heating wire. That is, the heating wire is switched between energized and de-energized in accordance with the temperature change of the electric carpet to control it to a required temperature. By the way, in order to prevent useless consumption of electric power when the electric carpet is not used for a long time with the electric carpet energized, the presence / absence of the user is determined based on the degree of change in the energization time. There are some that try to lower the rate. The energizing time of the electric carpet gradually decreases as the surface temperature rises, and conversely, the non-energizing time gradually increases, so that the surface temperature eventually becomes stable and the energizing time and non-energizing time It operates so that the ratio with time becomes substantially constant. This stable state is maintained when there is no user, but in the case where there is a user, the stable state is not maintained because the amount of heat radiation fluctuates. The presence / absence of is determined. However, even when the room temperature rises (decreases) with a heat source other than the electric carpet, the energization time of the heating wire becomes shorter (longer), and therefore, it is assumed that there is no person on the electric carpet even though there is a person on the electric carpet. There is a problem of misperception.

[0003]

As described above, even when the surface temperature of an electric carpet rises (decreases) due to the rise (fall) of room temperature, there is a problem that a user is erroneously recognized as being absent. is there. An object of the present invention is to prevent a user from being mistakenly recognized as being absent when the energization time of a heating wire changes due to a change in room temperature.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heating wire, a heat-sensitive wire whose impedance changes according to temperature, a reference voltage set to a voltage corresponding to a set temperature, and A control unit that calculates a temperature from the impedance of the heat-sensitive wire, converts the temperature into a voltage, and outputs a control signal for energizing when the voltage is lower than the reference voltage and de-energizing when the voltage is higher than the reference voltage. In the control device for an electric carpet, comprising an energization control unit for switching the heating wire between energized / deenergized based on a signal, the control unit stores a room temperature detection unit for detecting a room temperature and data from the room temperature detection unit. A room temperature change calculating a room temperature drop amount from a room temperature data memory unit, and new data from the room temperature detection unit and data two times before read from the room temperature data memory unit. An operation unit, an energization detection unit that detects the energization time of the heating wire, an energization time memory unit that stores data from the energization detection unit, and new data from the energization detection unit and read from the energization time memory unit And an energization time change amount calculation unit for calculating the amount of decrease in the energization time from the data two times before the current time. The user's presence is determined based on the data from the room temperature change amount calculation unit and the data from the energization time change amount calculation unit. The control device of the electric carpet is configured to determine the absence / absence and continue the normal control signal output when the user is present, and to output the control signal of the required energization rate when the user is absent.

[0005]

With the above construction, in the electric carpet control device according to the present invention, the surface temperature of the electric carpet is detected from the impedance of the heat-sensitive wire disposed substantially parallel to the heating wire of the electric carpet. When the surface temperature is lower than the set temperature, the power is supplied to the heating wire provided in the electric carpet body, and when the surface temperature is higher, the power supply is cut off. This energization time is stored in the storage unit for each energization / de-energization cycle, and when new energization time data is input, this new data is calculated with the last two data read out from the storage unit,
While calculating the amount of change in the energizing time, a room temperature detecting unit is provided to detect the room temperature, a room temperature difference corresponding to the calculation of the amount of change in the energizing time is obtained, and used based on the amount of change in the energizing time and the room temperature difference. The presence / absence of the person. If it is determined that the user is absent, the power supply rate of the heating wire is reduced to the power supply rate set for the absence of the user, thereby saving power.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an electric carpet control apparatus according to an embodiment of the present invention. FIG. 1 is a main block diagram showing an embodiment of an electric carpet control device according to the present invention. In the figure, 1 is a heat-sensitive wire, 2 is a temperature detecting unit, 3 is a reference voltage, 4 is a control unit, 5 is an energization control unit, 6 is a heating wire, and 7 is a room temperature detecting unit. Reference numerals 8 and 9 in the control unit 4 denote A / D converters, reference numeral 10 denotes a comparison unit, reference numeral 11 denotes a memory unit, reference numeral 12 denotes a calculation unit, reference numeral 13 denotes an energization detection unit, and reference numeral 14 denotes a control unit.

[0007] The electric carpet generates heat when the heating wire 6 disposed in the main body is energized. The heat-sensitive wire 1 is disposed substantially in parallel with the heat-generating wire 6, and the impedance changes according to the temperature. The temperature detector 2 detects the surface temperature based on the impedance of the heat-sensitive wire 1 and outputs an analog signal. The signal from the temperature detector 2 is input to the control unit 4, converted into a digital signal by the A / D converter 8, and compared with the reference voltage 3 by the comparator 10. Reference voltage 3
For example, corresponding to the temperature scale set by the user, a voltage corresponding to the upper limit temperature Tu at which energization should be cut off,
This is a voltage corresponding to the lower limit temperature Td at which energization should be restarted. If the value from the temperature detection unit 2 is lower than the voltage indicating the lower limit temperature Td, the control unit 14 outputs a control signal for energization, and the control unit 5 outputs a control signal for energization.
Is controlled to be energized, and the value from the temperature detection unit 2 is set to the upper limit temperature.
Outputs a de-energized control signal when the voltage reaches Tu,
The power supply to the heating wire 6 is cut off via the power supply control unit 5. As a result, as shown in FIG.
Is controlled to fall within a range of a predetermined temperature Tu to Td corresponding to the temperature scale set by the user. The heat generated by the heating wire 6 is stored in the electric carpet body by repetition of energization / de-energization, whereby the rise of the surface temperature 21 during energization becomes gradually steep, and the energization period is gradually shortened. The falling of the surface temperature 21 during the period gradually becomes gentle, and the non-energization period gradually becomes long.

As shown in a flow chart shown in FIG. 3, a control signal for energization / non-energization output to the energization control unit 5 is transmitted to the control unit 14.
, And a monitoring signal is input to the energization detection unit 13 to detect energization time (··········) for each energized / deenergized cycle (t3, t4, t5 ··· in FIG. 2). (Step 1, hereinafter abbreviated as ST1) is recorded in the memory unit 11. Then, when new data is output from the energization detection unit 13, this data is input to the calculation unit 12, and at the same time, the data two times before is read from the memory unit 11, and the change amount of the new and old two energization times is calculated (ST2). .

On the other hand, a room temperature (22 in FIG. 2) is detected by a room temperature detecting section 7 provided on the electric carpet, and this signal is converted into a digital signal by an A / D converter 9 and recorded in the memory section 11. The detection of the room temperature is performed, for example, in accordance with the energized / deenergized cycle (t3, t4,.
According to 12, the change amount of the room temperature in the same period as the calculation of the change amount of the energization time is calculated, and the change amount of the energization time is corrected (ST3).

When the variation of the energization time obtained by correcting the variation of the room temperature is equal to or less than a predetermined value (ST4: Yes)
), The user is determined to be absent (ST5), a control signal of a low duty ratio set for the absence of the user is output from the control unit 14, and the power supply of the heating wire 6 is performed via the power supply control unit 5. The power saving operation is started by reducing the time ratio (ST6), and thereafter, the monitoring of the surface temperature and the room temperature is continued (return to ST1). If the change amount of the energization time is equal to or more than the predetermined value (ST4: No), it is determined that the energization time has changed due to a change in room temperature due to another heat source, and that this is not due to the absence of the user. (ST7), monitoring is continued while normal operation is continued (ST8) (return to ST1).

In order to prevent temporary fluctuations due to external factors, or to prevent erroneous recognition, the state where the amount of change in the energization time is equal to or more than a predetermined value and the amount of change in room temperature is equal to or less than a predetermined value is plural times. For example, it may be determined that the user is absent when the user is consecutive twice.

[0012]

As described above, according to the control apparatus for an electric carpet according to the present invention, the accuracy of determining whether or not a user is present is improved, and the changing speed of the energization time of the electric carpet is reduced. Even if it is faster than usual, if the room temperature changes due to another heat source, it is determined that it is not because the user has disappeared, for example,
When used in a room where sunlight shines, the room is warm but does not cause a problem that the floor surface does not warm.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing an embodiment of an electric carpet control device according to the present invention.

FIG. 2 is a diagram illustrating a relationship among a surface temperature, an energized period / non-energized period, and room temperature for explaining the operation of the electric carpet control device according to the present invention.

FIG. 3 is a flowchart for explaining the operation of the electric carpet control device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat sensing wire 2 Temperature detection part 3 Reference voltage 4 Control unit 5 Power supply control part 6 Heating wire 7 Room temperature detection part 10 Comparison part 11 Memory part 12 Operation part 13 Power supply detection part 14 Control part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24D 13/02 G05D 23/24 H05B 3/00 365

Claims (5)

(57) [Claims] 1. A heating wire, a heat sensing wire whose impedance changes according to temperature, a reference voltage set to a voltage corresponding to a set temperature, and a temperature calculated from the impedance of the heat sensing wire and converted into a voltage. A control unit for outputting a control signal for energizing when the voltage is lower than the reference voltage, and outputting a control signal for non-energizing when the voltage is higher than the reference voltage; and energizing for switching the heating wire between energizing / deenergizing based on a control signal from the control unit. In the electric carpet control device comprising a control unit, the control unit includes a room temperature detecting unit for detecting a room temperature, a room temperature data memory unit for storing data from the room temperature detecting unit, and new data from the room temperature detecting unit. A room temperature change amount calculation unit for calculating a room temperature change amount from the previous data read from the room temperature data memory unit; and an energization detection unit for detecting the energization time of the heating wire. And an energization time memory unit that stores data from the energization detection unit, and an energization time period that calculates a change amount of the energization time from new data from the energization detection unit and previous data read from the energization time memory unit. A change amount calculation unit, and determines presence / absence of a user based on data from the room temperature change amount calculation unit and data from the energization time change amount calculation unit. A control device for an electric carpet, wherein output is continued and a control signal of a required duty ratio is output when a user is absent. 2. The room temperature change amount calculation unit calculates a room temperature change amount from new data from the room temperature detection unit and data two times before read from the room temperature data memory unit,
The power supply time change amount calculation unit calculates a change amount of the power supply time from new data from the power supply detection unit and data before the last time read from the power supply time memory unit. 2. The control device for an electric carpet according to claim 1. 3. The room temperature change amount calculation unit calculates a room temperature rise amount from new data from the room temperature detection unit and data two times before read from the room temperature data memory unit,
The power supply time change amount calculation unit calculates a reduction amount of the power supply time from new data from the power supply detection unit and data before the last time read from the power supply time memory unit. 2. The control device for an electric carpet according to claim 1. 4. The apparatus according to claim 1, wherein the presence / absence of the user is determined from a plurality of data from the room temperature change amount calculation unit and a plurality of data from the energization time change amount calculation unit. The control device for an electric carpet according to claim 1, 2 or 3. 5. The method according to claim 5, wherein the room temperature detecting unit is configured to supply a current to the heating wire.
4. The control device for an electric carpet according to claim 1, wherein room temperature data is output every switching cycle of de-energization.