Valve timing for internal-combustion engines

US5931124A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Martin Kerkau · Rain, DE
• Ingemar Denbratt · Lindome, SE
• Jan E. Rydquist · Lindome, SE

Key dates

• Filing date: Jun 18, 1997
• Grant date: Aug 3, 1999
• Expiry date: Jun 18, 2017

Classification

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

Abstract

The invention relates to a valve timing for an internal-combustion engine with a variable control of the outlet valve. For reducing the HC-emissions, it is suggested according to the invention to adjust the closing of the outlet valve toward "early". This adjustment must be carried out to such an extent that the outlet valve will be closed before the piston has reached the upper dead center.