Heater control system for a clothes dryer

• US 6,775,924 B2
• Filed: 05/22/2002
• Issued: 08/17/2004
• Est. Priority Date: 05/22/2002
• Status: Active Grant

• Current Assignee: Maytag Corporation (Whirlpool Corporation)
• Original Assignee: Maytag Corporation (Whirlpool Corporation)
• Inventors: Bruntz, Jordan S., Herr, Joel L.
• Primary Examiner(s): Bennett, Henry
• Assistant Examiner(s): NGUYEN, CAMTU TRAN
• Application Number:
  US10/152,013
• Publication Number:
  US 20030217481A1
• Time in Patent Office: 818 Days
• Field of Search: 345/43, 345/24, 345/49, 345/53, 219/482, 219/483, 219/485
• US Class Current: 34/543
• CPC Class Codes: D06F 2101/00 User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
• CPC Class Codes: D06F 2101/18 Target temperature for the drying process, e.g. low-temperature cycles
• CPC Class Codes: D06F 2103/08 Humidity
• CPC Class Codes: D06F 2105/12 Humidity or dryness of laundry
• CPC Class Codes: D06F 2105/58 Indications or alarms to the control system or to the user
• CPC Class Codes: D06F 34/08 Control circuits or arrangements thereof
• CPC Class Codes: D06F 58/38 of drying, e.g. to achieve the target humidity

Abstract

A clothes dryer is provided with control elements which enable a user to set both a drying temperature and the amount of power sent to a main heating element of the dryer during a dryer cycle. In accordance with the most preferred form of the invention, an infinitely variable power supply controller is used to selectively establish the maximum power provided to the main heating element during the dryer cycle. The controller preferably is adjusted by a slider switch mounted on a control panel of the dryer. The switch is preferably provided with indicators to indicate the established power level.

Claims

1. A clothes dryer comprising:

an outer cabinet shell;

a drum rotatably mounted within said outer cabinet shell, said drum being adapted to receive articles of clothing to be heated and dried within said drum;

a heater for heating the articles of clothing; and

a control panel for inputting operational parameters for a drying cycle, with said operational parameters including a desired drying temperature and a variable power setting for the heater.

2. The clothes dryer according to claim 1, wherein the control panel includes a plurality of setting elements, one of said plurality of setting elements constituting a temperature selector for establishing the desired drying temperature and another one of said plurality of setting elements constituting an infinitely variable control member for establishing the variable power setting for the heater.

3. The clothes dryer according to claim 2, wherein the infinitely variable control member establishes an amount of power sent to the heater.

4. The clothes dryer according to claim 3, wherein the amount of power may be selectively varied between upper and lower wattage limits.

5. The clothes dryer according to claim 4, wherein the lower wattage limit is substantially zero.

6. The clothes dryer according to claim 5, wherein the upper wattage limit is greater than 5,000 watts.

7. The clothes dryer according to claim 2, wherein said infinitely variable control member constitutes a sliding switch.

8. A method of performing a drying operation on articles of clothing within a drum of a clothes dryer comprising:

setting a drying temperature for to drying operation;

adjusting a power setting for a heater of the clothes dryer, with the power setting representing the maximum allowable amount of power to be sent to the heater during the dryer operation; and

performing the drying operation based on the set drying temperature and the power setting such that the amount of power sent to the heater is adjusted based on the set drying temperature up to the power setting.

9. The method of claim 8, further comprising:

adjusting the power setting for the heater in an infinitely variable manner.

10. The method of claim 9, further comprising:

manually positioning a control element provided on a control panel of the clothes dryer to establish the power setting.

11. The method of claim 10, wherein manually positioning the control element constitutes repositioning a slider switch.