Internal combustion engine with spark ignition

US5642706A · kind A · utility

Assignee

• Avl Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List · AT

Inventors

• Martin Wirth · Hitzendorf, AT
• Walter Piock · Hitzendorf, AT

Key dates

• Filing date: May 2, 1996
• Grant date: Jul 1, 1997
• Expiry date: May 2, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A combustion chamber formed by a recess in the piston of an internal combustion engine is divided by restrictions into two or more partial chambers. The ratio between the minimum distance in the area of the restrictions and the maximum distance in concave areas of the wall of the combustion chamber, as measured from the axis of the combustion chamber, is between 0.2 and 0.5. In the area of the minimum distance downstream of the restriction, the wall of each partial chamber is inclined relative to the axis of the combustion chamber, the inclination decreasing continuously in downstream direction. To achieve extremely lean operation with low exhaust emissions, the fuel injection device is located in a position eccentric to the center of the combustion chamber, and the ignition device is located approximately in the center of the combustion chamber. The restrictions of the piston recess are provided with guide faces located approximately parallel to the axis of the combustion chamber and directed towards the center of the combustion chamber, the smallest distance of these guide faces from the center of the combustion chamber being 0-0.2 times the piston diameter.