Piston internal combustion engine with pressure relief gas exhaust valves

US6568359B2 · kind B2 · utility

Assignee

• FEV MOTORENTECHNIK GMBH · DE

Inventors

• Franz Pischinger · Aachen, DE
• Wolfgang Salber · Aachen, DE
• Thomas Esch · Kaarst, DE
• Frank van der Staay · Aachen, DE
• Oliver Lang · Dietach, AT

Key dates

• Filing date: Aug 23, 2002
• Grant date: May 27, 2003
• Expiry date: Aug 23, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2470/30
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A piston internal combustion engine with at least one gas exhaust valve (2) for each cylinder (1), which is actuated by an actuator (7), in particular an electromagnetic actuator, controlled by a fully variable engine control unit (15). Based on the predetermined operating cycle, the valve can close off the cylinder interior space against a gas exhaust channel (13) that follows the valve seat (3) of the exhaust valve. This channel is connected to an exhaust gas system and is provided with a means for example a constriction (14) for reducing the pressure gradient during the start of the opening of the gas exhaust valve (2). A specific pressure fluctuation is used for a further reduction in the pressure gradient behind the exhaust valves during the opening through a corresponding layout of the pipe geometry and the container volumes in the exhaust gas system or corresponding installed components.