Heater diagnostics and electronic control for a clothes dryer

Details Heater diagnostics and electronic control for a clothes dryer Heater diagnostics and electronic control for a clothes dryer

1990-01-02

1992-04-07

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With apparatus using centrifugal force

34 44, 34 45, 34 48, F26B 1900

Patent

active

051015757

ABSTRACT:
A control for a clothes dryer with an induction drive motor and an electric resistance heater element. A single sense winding is threaded through sensors monitoring drive motor current and heater current, generating an output voltage each time the alternating motor or heater current passes through a zero-crossing. The control monitors the ON/OFF condition of the heater and samples the lagging phase angle of the motor current, and provides an improved means of detecting when the clothes load is dry. The control provides a clothes cooldown period with controlled moisture regain as per the user dryness selection. Numerous heater related diagnostic conditions are monitored at the start of each cycle, or, throughout each cycle, including: heater ground fault detection; 208 or 240 VAC service voltage identification; heater open/short circuit detection; open door detection; heater box thermostat cycling; and restricted air flow detection.

REFERENCES:
patent: 3203679 (1965-08-01), Williams et al.
patent: 3286508 (1966-11-01), Spiegel
patent: 3484772 (1969-12-01), Niewyk
patent: 3507052 (1970-04-01), Robandt
patent: 3593571 (1971-07-01), Wiechert
patent: 3874089 (1975-04-01), Offutt
patent: 4385452 (1983-05-01), DeSchaaf et al.
patent: 4422247 (1983-12-01), DeSchaaf
patent: 4481786 (1984-11-01), Bashark

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