Patent · US Active

Gearshift control method

US8423261B2 · kind B2 · utility

1Cited by

6References

15Claims

0Family size

Assignee

Scania CV AB (Publ) · SE

Inventors

Fredrik Swartling · Malung, SE
Mikael Hanson · Solna, SE

Key dates

Filing date	May 12, 2008
Grant date	Apr 16, 2013
Priority date	—
Expiry date	Jul 25, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a method and a system for controlling the Variable Turbine Geometry (VTG) of a combustion engine during up-gear shift, the VTG is opened based on a prediction when exhaust gas pressure is stabilized. During up-gear shift the VTG is closed to a closed position (301) to build an exhaust gas pressure and reduce engine speed, and a parameter from which the engine acceleration can be deduced is recorded. The VTG is determined to be opened to an open positioning response to the recorded parameter and a target engine speed of the up-gear shift (303), and the VTG is opened at a time corresponding to said determination to reduce the exhaust gas pressure (305). Hereby the up-gear shift can be made in a short time and at smooth operational conditions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.