System for controlling automobile cooling fan
US5718373A · kind A · utility
18Cited by
3References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1996 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Apr 22, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01P2031/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for controlling an automobile cooling fan utilizes a temperature-sensitive negative resistance device having a resistance which decreases as the temperature rises, and which increases as the temperature falls. Thus, if the cooling water temperature does not exceed a certain level, the cooling fan motor is not driven. If the temperature exceeds a certain level, the cooling fan motor is driven in proportion with the dynamic temperature variations. Therefore, a variable cooling fan speed is possible, and therefore, the cooling operation becomes efficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.