JP2002215246A - Method for controlling heater and temperature controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute dedewing, defrosting or the like in accordance with the practical dewed state or frosted state of a rear window glass or the like of a vehicle without using a temperature sensor or the like. SOLUTION: The voltage value of voltage applied to a heater 12 consisting of a resistor is measured by a voltage measuring part 16, the current value of a current allowed to flow into the heater 12 is measured by a current measuring part 20, the resistance value of the heater 12 is led out from these measured voltage value and current value, and power to be supplied to the heater 12 is controlled in accordance with the resistance value of the heater 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling the temperature of a heater constituting a defogger or the like provided on a rear window glass of a vehicle such as an automobile.

[0002]

2. Description of the Related Art When dew condensation or icing on the rear window glass of a vehicle such as an automobile, visibility behind is deteriorated, which may hinder driving. For this reason, a heater (defogger) is formed by laying a resistance wire around the rear window glass, and an electric current is supplied to the heater to generate heat, thereby performing defrosting, thawing, and the like.

In this case, a current is supplied to the heater by manually turning on the changeover switch, and the current is interrupted by turning off the changeover switch. In some cases, the timer is turned off after the passage of time. However, in such a method, it is necessary to set a lower current value in order to prevent the heater from overheating and burning when the outside air temperature is high. For this reason, when the outside air temperature is low, defrosting, defrosting, and the like do not end within a short time.

In order to solve such inconvenience,
The heater is divided into two circuits, a first heater and a second heater, and when the outside temperature of the vehicle detected by the temperature sensor is higher than a predetermined value, the first heater and the second heater are automatically connected in series. A power supply voltage is applied to the circuit so that the power supplied to the heater is reduced, and when the outside temperature of the vehicle is lower than a predetermined value, the first heater and the second heater are automatically connected in parallel. It has been proposed that the power supplied to the heater be increased by applying a power supply voltage to the circuit (Japanese Patent Laid-Open No. 9-86354).

[0005]

As described above, when the power supplied to the heater is adjusted in accordance with the outside temperature of the vehicle detected by the temperature sensor, defrosting and deicing can be performed relatively efficiently. However, it is necessary to provide a temperature sensor, a detection circuit, and the like for detecting the outside air temperature separately from the heater circuit. Further, when the outside air temperature which has been low has risen, the temperature sensor detects the rising outside air temperature, but the rear window glass may still be frozen. In such a case,
A difference occurs between the outside air temperature detected by the temperature sensor and the actual temperature of the rear window glass. Even though it is necessary to increase the power supplied to the heater, only a small amount of power is supplied. As a result, defrosting and deicing are not performed efficiently.

[0006] The present invention has been made in view of such circumstances, and it is possible to efficiently perform defrosting and deicing according to actual dew condensation conditions and icing conditions without using a temperature sensor or the like. It is an object to provide a temperature control method and a temperature control device for a heater.

[0007]

In order to achieve the above object, the present invention provides a method for controlling the temperature of a heater comprising a resistance wire, the method comprising controlling a voltage value applied to the heater and a current value flowing through the heater. Is measured, and the heater is controlled to a predetermined temperature by adjusting the power supplied to the heater based on the measured voltage value and current value.

According to this method, the power supplied to the heater is adjusted based on the measured voltage value and current value so that the heater has a predetermined temperature. That is, when the temperature of the heater is low and defrosting or deicing is difficult to be performed in a short time, the power supplied to the heater determined by the voltage value and the current value is increased so that the heater reaches a predetermined temperature. To be. Further, when the temperature of the heater is high and the defrosting or deicing is performed in a short time, the power supplied to the heater is reduced so that the heater is not burned. As described above, since the electric power is adjusted based on the temperature of the heater itself, it is possible to reliably perform defrosting and deicing as compared with the conventional electric power adjustment based on the outside air temperature. Prevention and the like can be reliably performed.

According to a second aspect of the present invention, in the method according to the first aspect, a temperature of the heater or a parameter value relating to the temperature is derived from the measured voltage value and current value,
It is characterized in that the power supplied to the heater is adjusted according to the derived value.

According to this method, the temperature of the heater or a parameter value related to the temperature (for example, the resistance value of the heater) is derived from the measured voltage value and current value, and according to the derived temperature and parameter value. The power supplied to the heater is adjusted. That is, since the heater temperature and the resistance value are related to each other, the heater resistance value is obtained from the measured voltage value and the current value, and the heater temperature is derived from the obtained resistance value. The power is adjusted according to the temperature of. In addition, similarly to the temperature of the heater, the power can be adjusted by the derived parameter value related to the temperature (for example, the resistance value of the heater).

According to a third aspect of the present invention, in the method according to the second aspect, the power supplied to the heater is increased when the temperature of the heater is low, and the power supplied to the heater is reduced when the temperature of the heater is high. It is characterized by.

According to this method, when the temperature of the heater is low, the electric power supplied to the heater is increased to increase the temperature of the heater, so that defrosting and deicing can be performed in a short time. You. When the temperature of the heater is high, the electric power supplied to the heater is reduced to prevent the heater from burning.

Further, the invention of claim 4 provides the invention according to claims 1 to 3
The method according to any one of the above, wherein the power supply is stopped when a predetermined time has elapsed since the power supply to the heater was started.

[0014] According to this method, the power supply is stopped when the time to complete the defrosting or deicing has elapsed since the power supply to the heater was started, so that unnecessary power consumption was achieved. Is suppressed.

According to a fifth aspect of the present invention, there is provided a temperature control device for a heater comprising a resistance wire, wherein a voltage measuring means for measuring a voltage value applied to the heater, and a current measuring device for measuring a current value flowing through the heater. Means, and power adjusting means for adjusting the power supplied to the heater based on the voltage value and the current value measured by the measuring means, so that the heater has a predetermined temperature. And

According to this configuration, the power supplied to the heater is adjusted based on the measured voltage value and current value, so that the heater reaches a predetermined temperature. That is, when the temperature of the heater is low and defrosting or deicing is difficult to be performed in a short time, the power supplied to the heater determined by the voltage value and the current value is increased so that the heater reaches a predetermined temperature. To be. Further, when the temperature of the heater is high and the defrosting or deicing is performed in a short time, the power supplied to the heater is reduced so that the heater is not burned. As described above, since the electric power is adjusted based on the temperature of the heater itself, it is possible to reliably perform defrosting and deicing as compared with the conventional electric power adjustment based on the outside air temperature. Prevention and the like can be reliably performed.

According to a sixth aspect of the present invention, in the fifth aspect, the power adjusting means includes a deriving means for deriving a heater temperature or a parameter value relating to the temperature from the measured voltage value and current value. And the power supplied to the heater is adjusted according to the value derived by the deriving means.

According to this configuration, the temperature of the heater or a parameter value related to the temperature (for example, the resistance value of the heater) is derived from the measured voltage value and the current value, and the temperature and the parameter value are determined according to the derived temperature and parameter value. The power supplied to the heater is adjusted. That is, since the heater temperature and the resistance value are related to each other, the heater resistance value is obtained from the measured voltage value and the current value, and the heater temperature is derived from the obtained resistance value. The power is adjusted according to the temperature of. In addition, similarly to the temperature of the heater, the power can be adjusted by the derived parameter value related to the temperature (for example, the resistance value of the heater).

According to a seventh aspect of the present invention, in the sixth aspect, the power adjusting means increases the power supplied to the heater when the temperature of the heater is low, and supplies the power to the heater when the temperature of the heater is high. It is characterized in that the power to be used is reduced.

According to this structure, when the temperature of the heater is low, the electric power supplied to the heater is increased to increase the temperature of the heater, so that defrosting and deicing can be performed in a short time. You. When the temperature of the heater is high, the electric power supplied to the heater is reduced to prevent the heater from burning.

Further, the invention of claim 8 is the invention of claims 5 to 7
And a supply stop means for stopping the power supply when a predetermined time has elapsed since the start of the power supply to the heater.

According to this configuration, the power supply is stopped when the time for defrosting or thawing ends after the power supply to the heater is started. Is suppressed.

[0023]

FIG. 1 is a circuit diagram of a temperature control device to which a method of controlling a temperature of a heater mounted on a vehicle such as an automobile according to an embodiment of the present invention is applied. In FIG. 1, a temperature control device 10 includes a heater 12 having one end connected to a + B terminal of a battery, an enhancement-type N-channel MOSFET 14 which is a semiconductor switch element connected between the other end of the heater 12 and ground, and a heater. A voltage measuring unit 16 for measuring a voltage value applied to the A / D converter 12; an A / D converter 18 for converting the voltage value measured by the voltage measuring unit 16 from an analog value to a digital value; A current measuring unit 20 for measuring, an A / D converter 22 for converting a current value measured by the current measuring unit 20 from an analog value to a digital value, and a voltage value measured by the voltage measuring unit 16 and the current measuring unit 20 And MOSF based on the current value
A control unit 24 for controlling a control signal supplied to the ET 14. The MOSFET 14 and the control unit 24
Constitutes a power adjusting unit (power adjusting means) that adjusts the power supplied to the heater 12 by the.

The heater 12 constitutes a defogger formed by extending a resistance wire over substantially the entire area of the rear window glass. Note that, as the resistance wire, a wire in which a resistance wire material such as tungsten is embedded in an intermediate portion of a laminated glass, or a wire formed by applying a paste mainly composed of conductive metal powder to a glass surface in a thin wire shape and baking it is used. Can be.

The MOSFET 14 constitutes a current control element for controlling a current flowing through the heater 12. The gate G serving as a control terminal is connected to the control unit 24, the drain D is connected to the heater 12, and the source S Is grounded. This MOSFET 14 is connected to the control unit 2
A control signal consisting of a pulse voltage continuous from
As a result, the conduction between the drain D and the source S during the ON period of the control signal results in the current flowing through the heater 12 by the power supply voltage applied by the battery. At this time, by changing the duty ratio of the control signal, the conduction period of the MOSFET 14 is changed, and the power supplied to the heater 12 can be adjusted.

The voltage measuring unit 16 includes an operational amplifier 161 and
One end is connected to one end of the heater 12, the other end is connected to the non-inverting input terminal (−) of the operational amplifier 161, the first resistor 162 is connected to one end of the heater 12, and the other end is connected to the operational amplifier 161. The second resistor 163 connected to the inverting input terminal (+) of the third resistor 1 and the third resistor 1 having one end connected to the inverting input terminal (+) of the operational amplifier 161 and the other end grounded.
64, and a fourth resistor 165 having one end connected to the non-inverting input terminal (−) of the operational amplifier 161 and the other end connected to the output terminal of the operational amplifier 161. As a result, a voltage value (a voltage value across the heater 12) applied to the heater 12 when the heater 12 is energized is measured, and the measured value is output to the output terminal of the operational amplifier 161.

The A / D converter 18 converts the voltage value at both ends of the heater 12 output to the output terminal of the operational amplifier 161 from an analog value to a digital value, and controls the voltage value at both ends of the heater 12 converted to the digital value. This is input to the unit 24.

The current measuring section 20 comprises an enhancement type N-channel MOSFET 201 and a fifth resistor 202 for detecting current. This MOSF
In the present embodiment, the ET 201 is formed in the same semiconductor substrate as the MOSFET 14, and its gate G is connected to the gate G of the MOSFET 14, and its drain D is connected to the other end of the heater 12 (the drain D of the MOSFET 14). And the source S is connected to the fifth resistor 20 whose one end is grounded.
2 is connected to the other end.

The fifth resistor 202 has a very small resistance value made of a resistance material having a small temperature coefficient of resistance. Even when the drain D and the source S of the MOSFET 14 are in a conductive state, the fifth resistor 202 is connected to the fifth resistor 202. MOSFET 14 and MO so that a minute current value flows through
The SFET 201 is configured.

Thus, the gate G of the MOSFET 14
Is supplied to the gate G of the MOSFET 201 at the same time when the control signal is supplied to the
01 is made conductive between the drain D and the source S.
A minute current flows through the fifth resistor 202, and the voltage value between both ends is input to the A / D converter 22 as a value corresponding to the current flowing through the heater 12.

The A / D converter 22 converts the voltage value between both ends of the fifth resistor 202 output from the current
The heater 12 converts the current value flowing through the heater 12 into a digital value, and converts the analog value into a digital value.
Is input to the control unit 24.

The control unit 24 includes a CPU for executing arithmetic processing.
(Central Processing Unit), a ROM (Read-Only Memory) storing a processing program and various data, and a RAM (Random Access Meme) for temporarily storing processing data.
mory) and the like.

The control unit 24 has a signal input terminal 2 to which an operation signal from an operation switch 26 of the heater 12 is input.
4a, a voltage input terminal 24b to which a voltage value between both ends of the heater 12 is input via the A / D converter 18, and a current input terminal to which a current value flowing to the heater 12 via the A / D converter 22 is input. 24c, MOSFET14 and MOSFET
201 and a signal output terminal 24d for supplying a control signal to the control signal 201.

The control unit 24 has a pulse generator 2 as a control signal supply means including a multivibrator or the like.
And a function realizing unit including a heater resistance deriving unit 242, a duty ratio adjusting unit 243, a time determining unit 244, and a power supply stopping unit 245. The pulse generator 241 is connected to the MOSFET 1 via the signal output terminal 24d.
4 and a control signal is supplied to each gate G of the MOSFET 201.

The heater resistance deriving section 242 calculates a resistance value of the heater 12 as a parameter value relating to the temperature of the heater 12 from a voltage value applied to both ends of the heater 12 and a current value flowing through the heater 12. That is, assuming that the resistance value of the heater 12 is R, the voltage value at both ends of the heater 12 is V, and the current value flowing through the heater 12 is I, the resistance value of the heater 12 is calculated from the equation of R = V / I. In addition,
This calculation formula is stored in the ROM (storage means) of the microcomputer in advance.

The duty ratio adjuster 243 changes the duty ratio (pulse width) of the control signal output from the pulse generator 241 to change the power supplied to the heater 12 in accordance with the resistance value of the heater 12 (ie, the power supplied to the heater 12). , Heater 1
2 is adjusted so that the heater 12 has a predetermined temperature. That is, the heater 1
2 has a positive resistance temperature characteristic (resistance temperature coefficient), when the resistance value is low, the rear window glass is frozen, and when the temperature of the heater 12 is low, the time required for defrosting or thawing is reduced. Therefore, the power to be supplied is increased by increasing the duty ratio and the conduction time of the MOSFET 14 to increase, and the temperature of the heater 12 is quickly increased so that defrosting and thawing can be performed in a short time. To be

When the heater 12 has a positive resistance-temperature characteristic, when the resistance value is high, the temperature of the heater 12 is high, and the time required for defrosting or deicing does not take much time. In addition, if the supplied power is increased, the heater 12 may be overheated and burned out. Therefore, the supplied power is reduced by reducing the duty ratio and the conduction time of the MOSFET 14 to reduce the supplied power. Avoid burning.

When the difference between the preset reference resistance value of the heater and the resistance value of the heater obtained by derivation is large, the duty ratio is made large so that the temperature of the heater 12 becomes large. When the difference is small, the change width is made small so that the temperature of the heater 12 is not excessively increased. Further, these duty ratios are determined by the heater 1
2 is stored in advance in the ROM (storage means) of the control unit 24 in correspondence with the resistance value of 2, and the stored duty ratio is changed and set by being read from the ROM according to the derived resistance value. It has become.

The time discriminating section 244 discriminates whether or not a predetermined time has elapsed since the power supply to the heater 12 was started. The power supply stopping unit 245 is connected to the heater 12.
When a predetermined time has elapsed since the start of the power supply to the heater 12, the output of the control signal from the pulse generator 241 is stopped, and the power supply to the heater 12 is cut off.

FIG. 2 is a flowchart for explaining the operation of the heater temperature control device 10 configured as described above. Now, when the operation switch 26 is operated and an operation signal is input to the signal input terminal 24a, a control signal having a predetermined duty ratio (for example, a duty ratio D = 1) generated by the pulse generator 241 is output. Terminal 24
The power is supplied to the gate G of the MOSFET 14 via the switch c and the heater 12 is turned on when the drain D and the source S of the MOSFET 14 become conductive during the ON period of the control signal (step S1).

Next, the voltage value applied to the heater 12 measured by the voltage measurement unit 16 is taken into the control unit 24 via the A / D converter 18 and the current measurement unit 20
Is measured by the controller 24 via the A / D converter 22 (step S3). Then, the heater 12 taken into the control unit 24
The resistance value of the heater 12 is derived by the heater resistance deriving unit 242 based on the voltage value applied to and the current value flowing through the heater 12 (step S5).

Next, the power supplied to the heater 12 corresponding to the derived resistance value of the heater 12 is adjusted by changing the duty ratio of the control signal by the duty ratio adjusting unit 243 (step S7). That is, when the heater 12 has a positive resistance-temperature characteristic and its resistance value is low (that is, when the temperature of the heater 12 is low), it takes a long time for defrosting, deicing, and the like. The duty ratio of the control signal generated by the pulse generator 241 is set to a large value in accordance with the resistance value of the heater 12, so that the power supplied to the heater 12 increases. Further, when the heater 12 has a positive resistance-temperature characteristic and its resistance value is high (that is, when the temperature of the heater 12 is high), defrosting and deicing are performed quickly, The duty ratio of the control signal is set to a small value in accordance with the resistance value of No. 12, so that the power supplied to the heater 12 is reduced.

Note that these duty ratios are set in advance by the control unit 2 in accordance with the resistance value of the heater 12 as described above.
4, and the stored duty ratio is set by being read from the ROM according to the derived resistance value.

Next, it is determined whether or not a predetermined time has elapsed since the start of power supply to the heater 12 by the time determining unit 244.
(Step S9). When this determination is affirmed, the power supply to the heater 12 is stopped by the power supply stop unit 245 assuming that the defrosting, the thawing, and the like have ended (step S11). When the determination in step S9 is negative, the process proceeds to step S3, and the steps after step S3 are repeatedly executed.

The heater temperature control method and the temperature control device of the present invention measure the voltage value applied to the heater 12 and the current value flowing through the heater as in the above-described embodiment, and determine the measured voltage value and the current value. The resistance value of the heater 12 is derived from the current value and the power supplied to the heater is adjusted according to the derived resistance value of the heater 12 so that the heater 12 has a predetermined temperature.

For this reason, when the heater 12 has a positive resistance temperature characteristic, when the resistance value is low, the electric power supplied to the heater is increased so that defrosting and deicing can be performed in a short time. When the resistance value is high, the electric power supplied to the heater is reduced, so that burnout of the heater 12 and the like are effectively prevented. Further, in the present invention, the resistance value of the heater 12 corresponding to the actual dew condensation state or the icing state in the rear window glass or the like is derived (detected) instead of detecting the outside air temperature with the temperature sensor. Even in the case where the outside air temperature does not correspond to the actual dew condition or icing condition, defrosting and deicing can be reliably performed.

It should be noted that the present invention is not limited to the above-described embodiment, but may adopt various modifications as described below.

(1) In the above embodiment, the heater resistance deriving unit 242 derives the resistance value of the heater 12 based on the calculation formula stored in the ROM, but the invention is not limited to this. For example, the correspondence between the voltage value applied to the heater 12 and the current value flowing through the heater 12 within the actually measured range and the resistance value of the heater 12 is stored in the form of a table in the ROM (storage means) of the control unit 24. In advance,
Measured voltage value applied to heater 12 and heater 12
The corresponding resistance value of the heater 12 may be read from the current value flowing through the heater 12.

(2) In the above embodiment, the power supplied to the heater 12 is adjusted according to the resistance value of the heater 12, but the invention is not limited to this. For example, it is also possible to convert the resistance value of the heater 12 into the temperature of the heater 12 and adjust the power supplied to the heater 12 according to the converted temperature. In this case, the heater resistance deriving unit 242 is used as a heater temperature deriving unit, and the temperature of the heater 12 can be obtained as follows.

That is, since the heater 12 composed of a resistance wire has a predetermined resistance-temperature characteristic (generally, a positive resistance-temperature characteristic), the correspondence between the resistance value of the heater 12 and the temperature is confirmed in advance. A calculation formula for calculating the temperature from the resistance value may be obtained in advance, and the temperature of the heater 12 may be derived based on the calculation formula. Alternatively, the correspondence between the resistance value of the heater 12 and the temperature may be stored in a ROM (storage means) in the form of a table, and the corresponding temperature may be read from the resistance value of the heater 12.

Further, the power supplied to the heater can be directly adjusted from the measured voltage value and current value without obtaining the heater resistance value and temperature. For example, a combination of each value of a voltage value and a current value within a range that can be actually measured, and a supply power value corresponding to the combination value are stored in a ROM (storage unit) in a table format,
A corresponding power supply value (or a current value supplied to the heater) may be read from the measured voltage value and current value, and the power supplied to the heater may be adjusted to the read power value. Alternatively, a calculation formula for calculating the supplied power value may be obtained from the measured voltage value and current value and stored in a ROM (storage means), and the power value may be calculated based on the calculation formula.

The point is that the power supplied to the heater should be adjusted based on the measured voltage value and current value. In addition, the temperature of the heater or a parameter value related to the temperature (for example, a resistance value of the heater) is derived from the measured voltage value and the current value, and the power supplied to the heater is adjusted according to the derived value. It should be. In any case, the heater 12 corresponding to the actual dew condensation state or the icing state on the rear window glass or the like.
Since the electric power is adjusted according to the temperature of the heater, even if the outside air temperature does not correspond to the actual dew condensation state or the icing state, it is possible to reliably perform defrosting and deicing, etc.
Can be reliably prevented.

(3) In the above embodiment, the MOSFET 1
Although the PWM control for adjusting the power by changing the duty ratio of the control signal supplied to the gate G of No. 4 is performed, the present invention is not limited to this. For example, MOSF
The control signal supplied to the gate G of the ET 14 is formed by a DC voltage, and the voltage value of the DC voltage is changed to
The conduction state between the drain D and the source S may be changed to adjust the power supplied to the heater 12. Further, although the control unit 24 is configured by a microcomputer, it may be configured by an analog circuit such as an OP amplifier.

(4) In the above embodiment, the supplied power is adjusted in accordance with the resistance value of the heater 12. In this case, each time the resistance value of the heater 12 is measured, the measured resistance value is used. The resistance value of the heater 12 may be divided into a number of groups in units of a predetermined resistance value range, and the measured resistance values may belong to different groups. Only when the power is supplied, the supplied power may be adjusted in accordance with the grouped resistance values. In any case, fine power adjustment can be performed.

When the resistance values are grouped, they are divided into two groups, a small resistance value group and a large resistance value group. When the resistance value of the heater 12 belongs to the small resistance value group, the power to be supplied is set in advance. It is also possible to set a large value, and when belonging to a group having a large resistance value, the supplied power to a preset small value.

(5) In the above embodiment, the power supplied to the heater 12 is adjusted by the MOSFET 14, but the present invention is not limited to this. For example, it is also possible to use another semiconductor switch element such as a bipolar transistor or an IGBT in which a MOSFET and a bipolar transistor are integrated. Further, the heater 12 is not limited to constituting a defogger provided on a rear window glass of a vehicle such as an automobile, and can be used for various applications.

[0057]

As described above, according to the present invention,
A voltage value applied to the heater and a current value flowing through the heater are measured, and the power supplied to the heater is adjusted based on the measured voltage value and current value. Dewatering and deicing can be performed efficiently according to actual dew condensation conditions and icing conditions without using them.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a temperature control device to which a heater temperature control method according to an embodiment of the present invention is applied.

FIG. 2 is a flowchart for explaining the operation of the temperature control device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Temperature control apparatus 12 Heater 14 MOSFET (power adjustment means) 16 Voltage measurement part (voltage measurement means) 18, 22 A / D conversion part 20 Current measurement part (current measurement means) 24 Control part (power adjustment means) 242 Heater resistance Derivation unit (derivation unit) 245 Power supply stop unit (supply stop unit)

Continuation of the front page (72) Inventor Shuji Mayama 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in the Auto Network Engineering Laboratory Co., Ltd. (Reference) 3D025 AA02 AC10 AD03 3K058 AA13 AA94 BA17 CA03 CA04 CA05 CA24 CB07 CB22 CB26 CD02 5H323 AA06 BB11 BB12 CA06 CB03 DA01 DB02 FF01 GG07 KK05 MM09 NN03 NN08

Claims (8)

[Claims] 1. A method for controlling a temperature of a heater comprising a resistance wire, comprising: measuring a voltage value applied to the heater and a current value flowing through the heater; and measuring the heater value based on the measured voltage value and current value. A method for controlling the temperature of a heater, comprising: adjusting a power supplied to a heater to a predetermined temperature. 2. Deriving a heater temperature or a parameter value related to the temperature from the measured voltage value and current value,
The method according to claim 1, wherein the power supplied to the heater is adjusted according to the derived value. 3. The heater temperature control method according to claim 2, wherein the power supplied to the heater is increased when the temperature of the heater is low, and the power supplied to the heater is decreased when the temperature of the heater is high. 4. The heater temperature according to claim 1, wherein the power supply is stopped when a predetermined time has elapsed since the power supply to the heater was started. Control method. 5. A temperature control device for a heater comprising a resistance wire, a voltage measuring means for measuring a voltage value applied to the heater, a current measuring means for measuring a current value flowing through the heater, and these measuring means. And a power adjusting means for adjusting the power supplied to the heater based on the voltage value and the current value measured by the control unit so that the heater has a predetermined temperature. . 6. The power adjusting means includes a deriving means for deriving a temperature of the heater or a parameter value relating to the temperature from the measured voltage value and current value, and supplies the heater to the heater in accordance with the value derived by the deriving means. 6. The heater temperature control device according to claim 5, wherein the power to be supplied is adjusted. 7. The power adjusting means increases power supplied to the heater when the temperature of the heater is low, and decreases power supplied to the heater when the temperature of the heater is high. 7. The heater temperature control device according to 6. 8. The power supply device according to claim 5, further comprising a supply stop unit that stops the power supply when a predetermined time has elapsed since the power supply to the heater was started. Heater temperature control device.