Compressor clutch cut-out control in an automotive air condition

Details Compressor clutch cut-out control in an automotive air condition Compressor clutch cut-out control in an automotive air condition

1992-02-19

1993-06-08

Tanner, Harry B.

Refrigeration

Processes

Compressing, condensing and evaporating

62150, 62157, 622283, F25B 4900

Patent

active

052168921

ABSTRACT:
An automotive air conditioning system utilizing an electrically operated refrigerant expansion valve controlled by a micro-computer. The compressor clutch cut-off is controlled by a suction pressure sensor at high thermal load. At partial flow conditions of the expansion valve, representative of moderate evaporator thermal loading, the micro-computer controls compressor clutch "ON" time from an accumulated count incremented by a predetermined amount according to suction pressure change. When the accumulated count over successive signal sampling intervals reaches a predetermined maximum the clutch is cut-out based on the count which is representative of a predetermined time interval.

REFERENCES:
patent: 4209994 (1980-07-01), Mueller et al.
patent: 4302947 (1981-12-01), Mueller et al.
patent: 4835976 (1989-06-01), Torrence
patent: 4848100 (1989-07-01), Barthel et al.
patent: 4856293 (1989-08-01), Takahashi
patent: 4944160 (1990-07-01), Malone et al.
patent: 4993231 (1991-02-01), Torrence et al.

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