Patent · US Expired

Method for operating an internal combustion engine with direct fuel injection

US7073479B2 · kind B2 · utility

7Cited by

2References

8Claims

0Family size

Assignee

Daimlerchrysler AG · US

Inventors

Bernd Kohler · Obertshausen, DE
Michael Oechsle · Sindelfingen, DE
Oliver Platzek · Ohmden, DE

Key dates

Filing date	Aug 9, 2005
Grant date	Jul 11, 2006
Priority date	—
Expiry date	Aug 9, 2025

Classification

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

Abstract

In a method of operating an internal combustion engine with direct fuel injection such that, in the engine startup period, a three-way catalytic converter disposed in the engine exhaust system is rapidly heated to a working temperature, in that a fuel quantity which is injected is injected in two separate injection steps with the first fuel volume being injected during the intake stroke and the second fuel volume being injected during the expansion stroke so as to form immediately before the ignition instant a rich stratified charge cloud in the region of the spark plug thereby ensuring reliable ignition of the stratified cloud while, overall, achieving a lean fuel/air mix in the combustion chamber.

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