Automotive cold start fuel volatility compensation
US6079396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Apr 29, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0612
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Automotive internal combustion engine fuel volatility is estimated during cold start operations by stabilizing air admission to the engine and analyzing engine speed over a modeling period following an engine coldstart after engine speed has stabilized and prior to closed-loop engine operation. If engine speed deviates significantly away from an expected engine speed for the current engine intake air and fuel, a fuel volatility deviation is diagnosed. The magnitude of the fuel volatility deviation away from a nominal fuel volatility is determined as a function of the magnitude of the engine speed deviation. A fuel volatility correction value is updated as a function of the engine speed deviation and is applied throughout an ignition cycle, including during the modeling period to compensate for the fuel volatility deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.