Patent · US Expired

Four-stroke internal combustion engine with spark ignition

US5727520A · kind A · utility

25Cited by

3References

18Claims

0Family size

Assignee

AVL LIST GMBH · AT

Inventors

Martin Wirth · Hitzendorf, AT
Walter Piock · Hitzendorf, AT
Frank Mundorff · Eisenerz, AT

Key dates

Filing date	Mar 31, 1997
Grant date	Mar 17, 1998
Priority date	—
Expiry date	Mar 31, 2017

Classification

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

Abstract

In order to optimize combustion in a four-stroke spark-ignition engine with direct fuel injection, the conditions of charge flow are improved by providing the top surface of each piston with an essentially U-shaped guiding rib, which is open towards the exhaust side of the combustion chamber, fuel injection taking place into the concave area inside the guiding rib. The nozzle opening of the fuel injection device as well as the ignition source are positioned in the area of the cylinder center, i.e., preferably on different sides of the longitudinal center plane of the engine.

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