Thermostat malfunction detecting system for engine cooling system
US6279390A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1997 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Dec 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Malfunction of an engine coolant thermostat is detected from the engine side coolant temperature by the subsequent behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes considerably different from that normally expected for times at which the thermostat is expected to be closed. When a closure-malfunction occurs, the coolant temperature becomes considerably different from that normally expected for times at which the thermostat is expected to be opened. Alternatively, the malfunction may be detected from the difference between the engine side coolant temperature and the radiator side coolant temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.