Refrigeration – Automatic control – With correlated manual or external operator and condition...
Patent
1987-04-13
1989-03-07
Bennet, Henry A.
Refrigeration
Automatic control
With correlated manual or external operator and condition...
165 25, 237 2A, F25D 2900
Patent
active
048095176
ABSTRACT:
A blower controlling device for an automobile air-conditioning system includes an automatic speed changing controller for controlling the speed of a blower motor during an automatic speed changing mode. The automatic speed changing controller includes a plurality of relays for changing speed of the blower motor, and automatically changes speed of the blower motor by driving the relays based on a thermal load signal from the air-conditioning system. The speed control of the blower motor can be switched from the automatic speed changing control to a manual speed changing controller by a changeover switch. The blower controlling device further include a control device which controls the automatic speed changing controller so that the relays do not operate when the blower motor is switched to the manual speed changing controller. Thereby, the relays are prevented from operating and generating their operating sounds when the air-conditioning system is not in the automatic speed changing mode.
REFERENCES:
patent: 4442885 (1984-04-01), Matsuzaki
Bennet Henry A.
Diesel Kiki Co. Ltd.
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