JP2911184B2 - Iron temperature control device - Google Patents

Description

The present invention relates to a temperature control device capable of controlling a base temperature of an iron to a predetermined temperature.

(B) Conventional technology As a temperature sensor in a conventional iron, a thermistor is generally used, and as shown in FIG. 7, the temperature-resistance characteristic is non-linear. When ON-OFF control is performed between the set temperature and the sensor signal using this non-linear thermistor or the like, the non-linearity is not a problem, but as shown in FIG. And the like, causing problems such as damage to the fabric and insufficient ironing.

Also, when analog control of heater power by PID control or the like is performed, if the deviation, differentiation, and integration of the set temperature and sensor output are calculated due to the non-linearity of the temperature sensor, these values also change nonlinearly and control. Is difficult.

Various methods have been devised in order to solve the above-mentioned problems, but in any case, the sensor circuit is complicated and large, and it is difficult to linearly compensate the entire operating temperature range of the iron. there were.

(C) Problems to be Solved by the Invention The present invention is to provide an iron temperature control device with high control accuracy by linearly compensating over the entire use temperature range and preventing overshoot using, for example, fuzzy inference. As an issue.

(D) Means for Solving the Problems In order to solve the problems, the present invention sets a heating means for heating an iron base, a temperature detecting means for detecting a heating temperature of the base, and a heating temperature of the base. Temperature setting means, comparison processing means for comparing a signal from the temperature setting means with a signal from the temperature detection means, and power control means for controlling power supply to the heating means by an output from the comparison processing means Wherein the comparison processing means comprises: a linear compensation memory section storing linear compensation data for linearly compensating the non-linear signal from the temperature detection means; and reading linear compensation data from the linear compensation storage section, A linear compensation calculator for linearly compensating for a non-linear signal from the temperature detector, a deviation between the linear compensation signal from the linear compensation calculator and the signal from the temperature setting unit, and a change in the deviation; DOO is a material obtained by such a signal processing section for calculating an output of the comparison processing unit.

(E) Operation With this configuration, the output signal from the temperature detection signal is
Based on the linear compensation data stored in the linear compensation storage unit,
By performing linear compensation by the calculation processing of the linear compensation calculation unit,
It is possible to linearly compensate the entire operating temperature range,
Easy and optimal temperature control can be performed.

(E) Operation Using the fuzzy inference according to the above configuration, the output signal from the temperature detecting means is linearly compensated to enable analog control,
This prevents overshoot and damages the fabric,
This is to perform optimal temperature control that can eliminate insufficient ironing due to a deviation in temperature setting.

(F) Embodiment (1) is an iron body, a base (3) having a heating means (2) such as a heater, a main body (4), and a control box (5) having various control means built therein. It has. (6) is a temperature detecting means such as a temperature sensor for detecting the heating temperature of the base (3). (7) is an operation button for operating and controlling a temperature setting unit described later.

Referring to the temperature control block diagram of FIG. 1, a signal from the temperature detecting means (1) is linearly compensated by a linear compensation calculating section (12) based on data of a linear compensation memory section (9) stored in advance. Then, the signal processing unit (6) processes the deviation e between the set temperature (m) and the signal (x) of the temperature detecting means (1) linearly compensated, and the rate of change Δe of the deviation.
Based on this e and Δe, the fuzzy inference operation unit (7) determines the membership function values of e and Δe shown in the example of FIG. 3 from the memory device (8) of the membership function and applies the rules of FIG. Based on this, the output value is fuzzy inferred.

The above rule is expressed in the form of "IF ~ (Antecedent part) THEN ~ (Consequent part)", the antecedent part is an inference proposition including fuzzy variables, and the consequent part is not a fuzzy number but a fuzzy number. It is represented by real numbers as shown. In this embodiment, there are seven common control rules at each set temperature as shown in FIG. The output (supply power to the heater) is fuzzy inferred using the MAX-MIN logical product and the real number method as the inference-determination method. The obtained inference result C is analog-controlled by the power control element (4) through power control means (10) by period control, phase control, and the like. Fuzzy inference is performed using the temperature deviation e and the value of the difference Δe as inputs.

Since the above-mentioned control rule is determined based on the characteristics of the iron and the set temperature, it can be determined in consideration of various conditions such as a heat delay of the control system of the iron and a heat delay of the temperature detecting means (1).

Explaining based on the control rule of this embodiment (FIG. 4), in rule 1, when the temperature deviation e is large, the heating means (5) is increased (100% output) regardless of the magnitude of the deviation difference Δe. Control so that the warm-up type does not take long. P (PB in FIG. 5) According to the rules 2 and 3, when the temperature deviation e becomes medium, the control method is changed depending on the magnitude of the deviation difference Δe. When Δe is large in the negative direction (indicated by NB) as in Rule 3, the temperature of the base (3) rises rapidly and the thermal delay of the temperature detecting means (1) is considered to be large, so the output is high. Is very small (indicated by ZR1) and saves the power of the heating means (5), and outputs until the temperature lag of the temperature detection means (1) is eliminated and the temperature is almost the same as the actual temperature of the base (3) surface Smaller. ‥‥ (ZR1 in FIG. 5) And, when Δe is 0 (indicated by ZR) as in rule 2,
Since the rise in the surface temperature of the base (3) is small, the thermal delay of the temperature sensor is also close to zero, so that the output is set to a medium level (indicated by PM) and immediately heated to the set temperature. PM (PM in FIG. 5) In rules 4 and 5, when the temperature deviation e decreases, the control method is changed according to the magnitude of Δe. Rule 4
When Δe is negative and medium (as shown by NM),
Since the temperature of the base is increasing, the output is reduced, and the base temperature is increased by using the preheating of the heater (5).
Prevent overshoot (rule 4). ‥‥ (fifth
(ZR1 in the figure) When Δe is positive and small as in rule 5 (PS
Since the base surface temperature decreases, the output is reduced and the heater is heated to the extent that overshoot does not occur. PM (PM in FIG. 5) According to Rule 6, when the temperature deviation e becomes 0, the heating means (5) supplies enough power to maintain the current base surface temperature regardless of the magnitude of Δe. ‥‥ (ZR in Fig. 5
2) In rule 7, turn off the power because the set temperature is overshot. (N in FIG. 5) Here, the linear processing memory section (9), the linear compensation calculating section (12), and the signal processing section (6) constitute a comparison processing means (15).

As described above, the temperature control of the iron base is performed by inputting the difference between the signal from the temperature detecting unit and the signal from the temperature setting unit and the difference value of the deviation, and using the characteristic unique to the control system of the iron in the control rule. By controlling the supply power of the heating means based on the execution of the fuzzy inference that has been inserted, it is possible to prevent overshoot at the time of rising and minimize the deviation from the set temperature, and
Since the value of the temperature sensor is linearly compensated and used, the temperature deviation e and the value of the difference Δe are also linearly compensated, and a common membership function and rule can be used at an arbitrary set temperature. Further, even when the power supply voltage to the iron changes, the value of Δe is considered, so that the influence can be minimized. In terms of device implementation, the signal processing means (6), the fuzzy inference operation unit (7),
The memory device section (8) for the rules and membership functions, the comparison processing means (15), and the power control means (10) can be replaced with a one-chip microcomputer, so that the device can be realized without increasing the size.

(G) Effects of the Invention According to the present invention, analog control can be performed by linearly compensating the signal from the temperature detection signal, overshooting of the base temperature can be eliminated, and fine-grained temperature control can be performed. Damage to the fabric and poor ironing can be prevented.

Further, the linear compensation is performed by the linear compensation calculation unit based on the linear compensation data stored in the linear compensation storage unit, so that it is possible to perform the linear compensation over the entire operating temperature range, thereby facilitating easy and optimal temperature compensation. Control can be performed.

[Brief description of the drawings]

1 to 6 show an embodiment according to the present invention. FIG. 1 is a block diagram of a temperature control, FIG. 2 is a side view of a main part of an iron body cut away, and FIGS. 3 (a) and 3 (b). Is an explanatory diagram showing an example of fuzzy variable definitions, FIG. 4 is an explanatory diagram showing an example of combining fuzzy variables, FIG. 5 is an explanatory diagram showing a membership function of control output, and FIG. FIG. 6B is a characteristic diagram of power supply, FIG. 7 is a characteristic diagram of a conventional temperature sensor, and FIG. 8 is a characteristic diagram of a conventional base temperature. (3) Base, (5) heating means, (1) temperature detection means, (2) temperature setting means, (15) comparison processing means, (10) power control means .

Claims (1)

(57) [Claims] 1. A heating means for heating an iron base, a temperature detecting means for detecting a heating temperature of the base, a temperature setting means for setting a heating temperature of the base, a signal from the temperature setting means and the temperature. Comparison processing means for comparing the signal from the detection means, and power control means for controlling the power supply to the heating means by the output from the comparison processing means, wherein the comparison processing means, from the temperature detection means A linear compensation memory for storing linear compensation data for linearly compensating the nonlinear signal of the above, and a linear compensation operation for reading the linear compensation data from the linear compensation memory and linearly compensating the nonlinear signal from the temperature detecting means. A signal processing unit for calculating a deviation between a linear compensation signal from the linear compensation calculation unit and the signal from the temperature setting unit and a change rate of the deviation as an output of the comparison processing unit. Temperature control of the iron to; and a part.