Washing machine and method of controlling the same

Details Washing machine and method of controlling the same Washing machine and method of controlling the same

1991-06-21

1993-08-03

Stinson, Frankie L.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

68 1222, 137387, 137606, D06F 3302

Patent

active

052317226

ABSTRACT:
The temperature or some other specific characteristic of a mixture of two liquids at different temperatures in a mixing chamber (14) is controlled by a microprocessor (8) which controls the supply of power to solenoid actuated valves (10 and 11) to control the quantities of the liquids admitted to the chamber (14) so that a desired temperature of the mixture is achieved using pulse width modulation control. The pulse width modulation control requires only one microprocessor timer and provides a substantially constant supply of power to one valve while varying the power supplied to the other valve to control flow through each valve and thus the temperature of the liquid mixture.

REFERENCES:
patent: 2442886 (1948-06-01), Bowen
patent: 2444631 (1948-07-01), Chace
patent: 3707856 (1973-01-01), Niewyk et al.
patent: 4267711 (1991-05-01), Kolze
patent: 4322031 (1982-03-01), Gehlert
patent: 4330081 (1982-05-01), McMillan
patent: 4406401 (1983-09-01), Nettro
patent: 4643350 (1987-02-01), DeSchaaf et al.
patent: 4978058 (1990-12-01), Duncan et al.
118,167 Sep. 1984, EP (European Patent Application).

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