Controlling an electrically actuated refrigerant expansion valve

Details Controlling an electrically actuated refrigerant expansion valve Controlling an electrically actuated refrigerant expansion valve

1995-02-08

1996-08-20

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62212, 236 78D, F25B 4104, F24F 314

Patent

active

055467563

ABSTRACT:
A control system for generating a pulse width modulated control signal for an electrically operated refrigerant valve. The controller receives inputs from evaporator inlet and outlet temperature sensors (T.sub.in, T.sub.out) and "fuzzy" logic to compute the discrete value of pulse width change needed, based upon the difference .DELTA.T=T.sub.out -T.sub.in and the time rate of change of .DELTA.T.

REFERENCES:
patent: 5156013 (1992-10-01), Arima et al.
patent: 5259210 (1993-11-01), Ohya et al.

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