Method and circuit for on/off control of the compressor of a mot

Details Method and circuit for on/off control of the compressor of a mot Method and circuit for on/off control of the compressor of a mot

1996-03-04

1998-10-27

Bennett, Henry A.

Refrigeration

Automatic control

Refrigeration producer

62227, 62208, F25B 100

Patent

active

058264396

ABSTRACT:
A method and circuit are provided for on/off control of the compressor of a motor vehicle air conditioner, in which the compressor is shut off when the evaporator temperature measured by an evaporator temperature sensor drops below a presettable shutoff temperature value located above 0.degree. C. The shutoff temperature value is set to fall as a function of the evaporator blower power and/or the temperature of the air drawn in by the evaporator blower with rising blower power or with rising intake air temperature. The circuit includes a control stage whose output signal is fed to an on/off switching element of the compressor and depends on the voltage level at an input node, which varies with the supply voltage of the evaporator blower and/or the output voltage of the intake air temperature sensor.

REFERENCES:
patent: 3636724 (1972-01-01), Moy
patent: 3803865 (1974-04-01), Newton
patent: 4412424 (1983-11-01), Iida et al.

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