Method of increasing the exhaust braking power of an internal combustion engine

US4981119A · kind A · utility

Assignee

• MAN Nutzfahrzeuge AG · DE

Inventors

• Alfred Neitz · Wendelstein, DE
• Joachim Weiss · Oyten, DE

Key dates

• Filing date: Jan 11, 1990
• Grant date: Jan 1, 1991
• Expiry date: Jan 11, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/027
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method of increasing the exhaust braking power of a four-stroke, reciprocating piston internal combustion engine, whereby in the braking operation, in a first and third stroke air is drawn in via an intake valve, and in a second and fourth stroke the air is compressed and, by partially opening an exhaust valve, is discharged against a damper that is disposed in an exhaust pipe or manifold. In order to increase the final compression pressure, i.e. to increase the energy that is to be applied for the compression, the exhaust valve is briefly opened at both the beginning and the end of the compression stroke.