Avl List Gmbh

Caterpillar Inc.

Thomas Kammerdiener

Peter Herzog

Jonathan P Kilkenny

Aaron Ness

Michael Glensvig

Franz Chmela

Klemens Neunteufl

Andreas Wimmer

Theodor Sams

Janos Csato

Peter Christian Meurer

Scott P Coulier

Helmut Eichlseder

Christian Fuchs

Gerhard Pirker

Guenter Figer

Ludwig Buergler

Michael Weissbaeck

Jonathan Kilkenny

Scott Coulier

A piston for balancing combustion efficiency and smoke generation with NOx production includes a combustion face forming a combustion bowl having a compound curvature increased in sharpness in a radially outward direction. An outer bowl surface defines a large radius of curvature adjacent an inner bowl surface, and a medium radius of curvature adjacent a cylindrical wall surface. The inner bowl, outer bowl, and wall surfaces together contour the combustion bowl, such that a diameter of the combustion bowl is about 124 mm so as to establish a bowl to bore ratio of about 0.71 in a direct injection compression ignition engine with a compression ratio of about 15:1 to 17:1.

Piston having combustion bowl and engine using same

The invention relates to a direct-injection internal combustion engine that is operated in a first operating range associated with the low part load, with largely homogeneous combustion of the mixture and subsequent injection. Said internal combustion engine is operated in a second operating range associated with the middle part load, with low-temperature combustion of the mixture. In this way, minimum nitrogen oxide and soot emissions and a high degree of efficiency can be achieved both in the lower part load region and up to the full load region.

Method for operating an internal combustion engine

A variable valve drive for a cam-actuated lift valve of an internal combustion engine which is loaded by a closing pressure against the direction of opening, includes a hydraulic power generating device acting on the lift valve against the closing force with a control piston arranged longitudinally displaceable in a cylinder and adjacent to a hydraulic control chamber, a stroke of the lift valve produced by an actuating cam being at least reducible by removing hydraulic liquid from the control chamber by means of a control valve. In order to arrange the valve stroke and valve opening as free as possible in the simplest possible way the control chamber is connectable with a high pressure level preferably by means of the control valve.

Variable valve drive

The invention relates to a variable valve train ( ) for a cam-actuated lifting valve ( ) of an internal combustion engine, which valve ( ) is loaded by a closing spring ( ) acting against the direction of opening, with an approximately cylindrical force application element ( ) located between a cam ( ) and the valve ( ), whose length can be adjusted hydraulically and whose exterior cylindrical wall face ( ) is slidable in a fixed guide cylinder ( ), said element ( ) being provided with a pressure piston ( ) longitudinally slidable in a cylinder ( ), which piston ( ) is adjacent to a pressure chamber ( ) into which opens a pressure channel ( ) departing from a port ( ) in the wall face ( ) of the force application element ( ), a fixed pressure line ( ) opening into the guide cylinder ( ) in the area of the port ( ), which line ( ) can be subjected to hydraulic high pressure (p ) permitting hydraulic activation of the valve ( ). In order to obtain a variable valve train ( ) independet of crank angle (KW) in as simple a manner as possible, a permanent flow connection is provided between pressure line ( ) and pressure channel ( ) independently of the position of the force application element ( ).

Variable valve train for a cam activated lifting valve of an internal combustion engine

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Graz, Austria

Thomas Kammerdiener