Low refrigerant charge protection method for a variable displace

Details Low refrigerant charge protection method for a variable displace Low refrigerant charge protection method for a variable displace

1990-08-02

1991-04-23

Tapolcai, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62126, 62129, F25B 4902

Patent

active

050090747

ABSTRACT:
A low charge protection method for an electronically controlled variable displacement compressor. In each period of compressor operation, a low charge test sequence is carried out to monitor the system performance once the system control pressure has been reduced below a specified level. In a set-up phase of the test, the compressor is down-stroked to near-minimum displacement for a predetermined time or until the system control pressure rises above a reference level. At such point, the compressor is up-stroked to near-maximum displacement to initiate a pull-down phase of the test. If the system pressure is reduced by specified amount within a reference interval, a failed test is indicated and the count in a nonvolatile counter is incremented. If the pull-down duration exceeds the reference interval, a passed test is indicated, and the count, if any, is decremented. When the nonvolatile count exceeds a specified threshold, the compressor is disabled and further operation is prevented until the count is reset by a service technician.

REFERENCES:
patent: 4167858 (1979-09-01), Kojema et al.
patent: 4328678 (1982-05-01), Kono et al.
patent: 4344293 (1982-08-01), Fujiwara et al.
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4677836 (1987-07-01), Sumikawa et al.
patent: 4966013 (1990-10-01), Wood

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