System and method for detecting cold engine operation
US6243642A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system and method for detecting cold engine operation include determining at least two fluid temperatures and providing an output signal based on the at least two temperatures. Preferably, an engine coolant temperature, an intercooler temperature, and an engine air temperature are determined via appropriate temperature sensors. In one embodiment, the cold engine output signal is activated or asserted if any one of the at least two fluid temperatures is below a corresponding temperature threshold. The cold engine output signal is deactivated when all of the fluid temperatures are above corresponding temperature thresholds (plus hysteresis where applicable). An optional user-selectable parameter provides for actuation of the cold engine output only during idle. The cold engine output signal may be used to control various accessories including coolant heating systems, shutters, or the like. Additional parasitic loads or an exhaust brake may be actuated to increase combustion temperatures by increasing engine load to reduce or eliminate white smoke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.