Measuring evaporator load in an automotive air conditioning syst

Details Measuring evaporator load in an automotive air conditioning syst Measuring evaporator load in an automotive air conditioning syst

1992-02-26

1992-10-06

Tanner, Harry B.

Refrigeration

Processes

Compressing, condensing and evaporating

62157, 622283, 623234, F25B 100

Patent

active

051521512

ABSTRACT:
An electronic controller receives a suction pressure sensor signal and measures the time required for the evaporator to be heated from compressor clutch cut-out to compressor clutch "ON". Depending upon the elapsed time, the controller selects from a predetermined schedule, a new value CLHOFF of the suction pressure P.sub.s at which the compressor is next cut-out, raising CLHOFF for lighter thermal loading to prevent evaporator icing and freeze-up and lowering CLHOFF for heavy thermal loading to prevent unwanted compressor cycling.

REFERENCES:
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4835976 (1989-06-01), Torrence
patent: 4843834 (1989-07-01), Inoue et al.
patent: 4848100 (1989-07-01), Barthel et al.
patent: 4932220 (1990-06-01), Inoue
patent: 4944160 (1990-07-01), Malone et al.
patent: 4993231 (1991-02-01), Torrence et al.
patent: 5022234 (1991-06-01), Goubeaux et al.

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