JPH0751189B2 - Clothes dryer control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a clothes dryer that detects drying of clothes and performs automatic operation.

2. Description of the Related Art In a conventional clothes dryer, a user sets a drying operation time by a timer. However, there is a problem that the time is set too depending on the user's can, which causes excessive drying or insufficient drying. In order to improve this problem, the resistance of the cloth when the cloth comes into contact with the electrode is measured by the electrode provided in the drum and the wetness of the cloth is detected, and the resistance value of the cloth becomes a certain value or more. After completion of the dryness detection (drying detection step), a drying delay step for a fixed time is performed, or the time t of the dryness detection step is measured from the start to the end of the dryness detection, and the time T of the remaining drying delay step is determined in advance. A clothes dryer that uses a given function (for example, T = 0.2 × t) has been put into practical use.

Problems to be Solved by the Invention As described above, since the drying delay process is controlled by the time of the drying detection process, if the door is opened and a damp cloth is added during the drying delay process, the additional cloth cannot be dried. The problem occurs. In order to solve this problem, the cloth can be completely dried by turning off the power once and then starting again, but there is a problem that the operability is poor.

The present invention solves such a problem, and an object of the present invention is to provide a clothes dryer control device that does not dry even if a damp cloth is added during operation.

Means for Solving the Problems In order to achieve the above object, the present invention provides a door switch for detecting opening and closing of a door for putting in and taking out clothes, and an electrode provided in a drum to change a resistance value of cloth in the drum. Drying detection unit that converts to voltage and the resistance value of the cloth from the drying detection unit is measured at regular intervals, and if the resistance value of the cloth is equal to or more than a predetermined resistance value for a certain period of time, it is determined that the cloth is dry. Completing the detection step, further comprising a control means for controlling to perform a drying delay step of performing auxiliary drying for a set time, the control means, when the door is opened and closed during the drying delay step,
After that, the drying detection is performed for a certain period of time again, and if the drying detection determines that the drying is performed, the drying delay step is continued, and if it is determined that the drying is not performed, the drying detection step is performed again.

With this configuration, even if a damp cloth is added during the drying delay step, the drying detection step is performed again when it is determined that the cloth has not been dried, so that it can be completely dried in any case.

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 2, reference numeral 1 denotes a motor that rotates a drum 3 for putting clothes by transmission of a drum belt 2 and rotates a fan 5 by a fan belt 4 to circulate hot air in the drum. 6 is a heater, and 7 is a door, and a door switch 8 is opened / closed as the door is opened / closed. The open / closed state of the door switch 8 is input to the control device 9. Reference numeral 10 is a filter for removing lint adhering to the cloth. Reference numeral 11 is an electrode, and the cloth in the drum contacts the electrode, and the resistance value of the cloth at that time is measured.

Next, the control device of the present invention will be described with reference to FIG. In the figure, reference numeral 12 is a switch input section, which is composed of a start switch 13 for starting the operation, a switch 14 for selecting a dry course (for example, a strong course, a standard course, etc.) and a door switch 8. The door switch 8 opens when the door 7 is opened and closes when the door 7 is closed. Reference numeral 15 is a display unit, and a lamp corresponding to the dry course selection switch 14 of the switch input unit 12 is turned on. 16 is a standard course lamp and 17 is a thorough course lamp. Reference numeral 18 denotes a dryness detecting unit which converts the resistance value of the cloth when the rotating clothes in the drum hit the electrode 11 provided in the drum into a voltage. When the resistance value of the cloth is smaller than a certain set resistance R _S , FET19 is OFF and transistor 20 is OFF, and when it is larger than R _S , FET19 is ON.
Then the transistor 20 is also turned on. Reference numeral 21 denotes a load driving unit which controls the motor 1 and the heater 6. Reference numeral 22 denotes a control unit which incorporates a timer unit, an input unit, an output unit, a ROM, a RAM, and the like, and controls the display unit 15, the load driving unit 21, and the like in accordance with a signal of the input unit and a preprogrammed sequence. A power supply unit 23 converts a commercial power supply into a DC voltage and supplies the voltage to each unit.

The operation of the above configuration will be described.

After setting the dry course with the dry course selection switch 14,
When the start switch 13 is pressed, the motor 1 and heater 6
Is energized to start the operation. At the start of operation, the clothes inside the drum 3 are wet, so the detection resistance of the electrode 11 is small and the output signal of the dryness detection unit 18 is at the L level, but the cloth is getting dry and the preset resistance R is set. _{When S} or more, the output signal becomes H level. The relationship between the detection resistance and the operating time is shown in FIG. That is, the sense resistor a predetermined time T ₁ minute (t ₂ -t ₁₎ is continuously becomes higher than R _S, the value of the time t ₂ until the sensed from the start of operation, remaining dry delay time (e.g., 0.2 + t ₂ ) Decide. The time until t ₂ is the dryness detection process,
The time remaining t ₃ -t ₂ is a dry delay step. The reason for providing the drying delay step is that not all the cloths are completely dried at the end of the drying detection step. The drying delay step may be a fixed time.

If the detection resistance becomes smaller than R _S during the fixed time of T ₁ minute (t ₂ −t ₁ ), the measurement of T ₁ until the fixed time is stopped and the measurement is performed again. Next, the operation when the door 7 is opened during operation to temporarily stop the operation or when cloth is added will be described. Even if the door 7 is opened and a damp cloth is added in the dryness detection step, there is no problem because the dryness is detected, but if a damp cloth is added during the drying delay step, the dryness detection is performed in this step. Since it is not performed and the process is performed for a predetermined time, the wet cloth may not be dried. As a solution to this problem, in the present invention, when the door 7 is opened and closed during operation, dry detection is performed again even during the drying delay step, and if the detection resistance is R _S or more continuously for a certain period of time, Perform the drying delay process time decided before opening and closing the door. In addition, the detection resistance becomes R _S
When the following occurs, the time so far is cleared, the process is returned to the dryness detection process, and control is performed so that the dryness detection process is performed from the beginning.

As described above, according to the present invention, when the door is opened / closed during the drying delay step, the dry detection is performed again, so that even if a damp cloth is added, the process does not end in an undried state. , It can be completely dried, the usability is improved and the value as a product can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a control circuit diagram of a clothes dryer according to an embodiment of the present invention, FIG. 2 is a sectional view of the clothes dryer, and FIG. 3 is a diagram showing detection resistance and operating time. is there. 1 ... motor, 3 ... drum, 6 ... heater, 8 ... door switch, 11 ... electrode, 18 ... drying detector, 22 ... control means.

Claims (1)

[Claims] 1. A door switch for detecting the opening and closing of a door for putting in and taking out clothes, a dry detecting section for converting a resistance value of cloth in the drum into a voltage by an electrode provided in the drum, and a dry detecting section. The resistance value of the cloth is measured at regular intervals, and if the resistance value of the cloth is equal to or higher than the predetermined resistance value for a certain period of time, it is judged that the cloth is dry, the drying detection process is terminated, and further auxiliary drying is performed for a set time. When the door is opened and closed during the drying delay step, the control means performs drying detection again for a certain period of time, and the drying is detected by the drying detection step. If it is determined that the drying delay step is continued, and if it is determined that it is not dried, control is performed to return to the drying detection step again.