Capacity control arrangement for a variable capacity wobble plate type compressor
US4946350A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Feb 23, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2205/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.