Protecting device for car air conditioner
US5931008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1998 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Mar 30, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C29/005
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A protecting device for a car air conditioner includes a timer for timing a period of the rise in the level of a rotation signal delivered from a rotation sensor for detecting a rotational speed of a compressor with the signal being distinguished from noise. On the basis of the obtained period, a judgment is made as to whether rotation of the compressor is in an abnormal state. An electromagnetic clutch between the compressor and a car engine is controlled on the basis of the judgment. The protecting device is mounted on a housing of the compressor with the rotation sensor so that wiring is executed only in an engine room. The protecting device includes a state holding device for memorizing the abnormal state of the rotation of the compressor. The air conditioner can restart on condition that a conscious operation is performed to reset the state holding device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.