System and method for improved fuel economy during vehicle deceleration conditions
US7425187B2 · kind B2 · utility
4Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2005 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | May 25, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of operating an engine of a vehicle having a powertrain having a transmission is described. The method includes, during a driver tip-out condition where the vehicle is decelerating, adjusting engine output based on a gear of the transmission, and reducing airflow to reduce engine torque output without reducing torque by retarding spark timing, following the driver tip-out, until airflow reaches a minimum value below which combustion may be degraded; and upon airflow reach said minimum value, retarding spark timing to further reduce engine output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.