Patent · US Active

Method for operating an internal combustion engine with direct fuel injection during a post-start phase

US7370629B2 · kind B2 · utility

12Cited by

4References

11Claims

0Family size

Assignee

Daimler AG · DE

Inventors

Bernd Kohler · Obertshausen, DE
Christoph Lux · Stuttgart, DE
Michael Oechsle · Sindelfingen, DE
Andreas Spieth · Seligenstadt, DE

Key dates

Filing date	Oct 13, 2006
Grant date	May 13, 2008
Priority date	—
Expiry date	Oct 13, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a method for operating a spark-ignition internal combustion engine with direct fuel injection in the post-start phase at low temperatures, fuel is supplied to the combustion air in a pilot injection (MH) of a first fuel quantity during an intake stroke of the internal combustion engine such that the pilot injection (MH) forms a homogeneous, lean air/fuel mixture (λ>1) in substantially the entire combustion chamber, and a main injection (MS) of a second fuel quantity is subsequently injected into the combustion chamber during a compression stroke directly before the ignition time (ZT), said main injection (MS) forming in the region of the spark plug a stratified, rich air/fuel mixture (λ<1), which is then ignited by the spark plug.

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