Capacity control arrangement for a variable capacity wobble plat

Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage

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417270, F04B 128

Patent

active

049463500

ABSTRACT:
A capacity control arrangement controlling the capacity of a variable capacity wobble plate type compressor of a car air-conditioner driven by an engine of the car employs an engine load sensor, a compressor discharge pressure sensor, a car speed sensor, a compressor crankcase chamber pressure sensor, a miscellaneous air-conditioning data sensor, and a central processing unit to calculate and adjust a duty ratio value at which a solenoid-operated capacity control valve of the compressor is electrically driven. The adjustment of the duty ratio is carried out in such a manner when the engine load exceeds a predetermined value, the solenoid-operated capacity control valve first takes a fully open position to establish the lowest compressor capacity for an adjusted short period of time, and subsequently, takes a reduced opening position to maintain the lowest compressor capacity for as long as the engine load exceeds the predetermined value.

REFERENCES:
patent: 4841736 (1989-06-01), Suzuki
patent: 4862700 (1989-07-01), Suzuki
patent: 4880356 (1989-11-01), Suzuki et al.

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