Fisher & Paykel Limited

Murray Greenman

Frank W Shacklock

Gerald David Duncan

Frank Whitney Shacklock

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.

Washing machine and method of controlling the same

A specific physical characteristic (temperature) of a mixture of two liquids in a mixing chamber (14) is controlled by progressively opening a valve member (35) of a selected valve (10,11) through which one of the liquids flows while the other liquid flows through the other valve, and if the temperature of the mixed liquids has not reached a desired level, the selected valve is left fully open while the other valve is progressively closed to adjust the temperature to that desired. The opening and closing of the valves is controlled in response to signals from a sensor in the mixing chamber.

Growing community of inventors

Auckland, New Zealand

Murray Greenman