Electronic temperature control

Details Electronic temperature control Electronic temperature control

1980-07-28

1982-04-20

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62132, 62180, 236 78D, F25B 100, F25B 4900

Patent

active

043252257

ABSTRACT:
An electronic temperature control having a temperature sensor (10) and a user-adjustable temperature range control (12). A difference amplifier (14) amplifies the difference between the signals from the temperature sensor and range control. A hysteresis comparator (16) then accepts the signal from the difference amplifier and uses it to control a transistor relay driver (18), which in turn controls the clutch coil (20) of the air conditioning system controlled by the temperature control. The transistor relay driver is disabled by an evaporator fan sensor (22) to avoid freeze-up of the evaporator when the fan is turned off. Since auto air conditioning systems rob the car's engine of power, an acceleration cut-out (24) is provided to disable the transistor relay driver when other power demands on the car's engine are great, such as on hard acceleration.

REFERENCES:
patent: 3398889 (1968-08-01), Bohannan
patent: 4240077 (1980-12-01), Hughes et al.

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