Low refrigerant charge protection method

Details Low refrigerant charge protection method Low refrigerant charge protection method

1989-02-13

1993-04-13

Wayner, William E.

Refrigeration

Automatic control

Time or program actuator

62227, G05D 2332

Patent

active

052018628

ABSTRACT:
A microprocessor based control for an automotive air conditioner receives inputs from transducers which measure suction gas pressure and temperature and ambient air temperature and provides outputs for compressor clutch control and instrument panel lights. The control includes a table of warning temperatures and critical temperatures of suction gas for various ranges of ambient temperature. The control is programmed to carry out the process of comparing compressor on times to a threshold and shutting down the compressor when the on times are repeatedly less than the threshold, looking up table values for warning temperature and critical temperature for the current ambient temperature, comparing suction gas temperatures to the table values and shutting down the compressor when the temperature is repeatedly above the critical temperature and giving a warning when the temperature is repeatedly above the warning temperature.

REFERENCES:
patent: 4395886 (1983-08-01), Mayer
patent: 4463573 (1984-08-01), Zeno et al.
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4796436 (1989-01-01), Voorhis et al.

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