Valve control of a supercharged four-cycle internal combustion engine

US4593662A · kind A · utility

Assignee

• MTU FRIEDRICHSHAFEN GMBH · DE

Inventors

• Rolf Baring · Markdorf, DE
• Wolfgang Rudert · Tettnang, DE
• Gerd-Michael Wolters · Markdorf, DE

Key dates

• Filing date: Sep 10, 1985
• Grant date: Jun 10, 1986
• Expiry date: Sep 10, 2005

Classification

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

Abstract

An air flow in the combustion space which swirls or rotates about the cylinder longitudinal axis is produced for the fine distribution of the fuel by a correspondingly constructed inlet channel controlled by two inlet valves in a supercharged four-cycle internal combustion engine with direct fuel injection. With a low air mass flow, the rotary movement of the air in the combustion space is only weak and therefore prone to disturbance. An improvement is achieved by a change of the air flow in the inlet channel system. The valve actuation contains, for that purpose, an adjusting mechanism consisting of a piston-cylinder-unit fed with pressure oil, which effects in one operating function an automatic valve clearance compensation and which enables in a second operating function together with a controllable closure device in the pressure oil feed line a stoppage of one of the two inlet valves actuated in unison by the valve actuation. The reduction of the inlet cross section produces in the second operating function an increased inflow velocity of the air into the combustion space whereby at the same time the valve disk of the stopped inlet valve no longer projects interferingly into th…