Internal combustion engine with combined pressure charging

US5335500A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Klaus Wunderlich · Waiblingen, DE
• Franz Neubrand · Plochingen, DE
• Erwin Schmidt · Baltmannsweiler, DE
• Hans-Wilhelm Buhl · Echterdingen, DE
• Friedrich Wirbeleit · Eßlingen, DE
• Horst Hanauer · Murrhardt, DE

Key dates

• Filing date: Mar 19, 1993
• Grant date: Aug 9, 1994
• Expiry date: Mar 19, 2013

Classification

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

Abstract

An internal combustion engine with combined pressure charging has an exhaust turbocharger turbine arranged in an exhaust conduit of the internal combustion engine driving a compressor arranged in an intake conduit. A mechanically driven supercharger is arranged downstream of the compressor and is coupled continuously variably to the engine via a Fottinger speed transformer with variable-pitch guide vanes and variable speed slip. To bypass the mechanically driven supercharger, a bypass conduit is provided. A circulating-air slide is arranged in the bypass conduit for controlling the air quantity bypassing the mechanically driven supercharger. The degree of opening of the circulating-air slide and the slip of the Fottinger speed transformer are controlled as a function of operating parameters such that the charge-air pressure is adjusted to a predetermined set point value.