公开(公告)号：US10570818B2

公开(公告)日：2020-02-25

申请号：US15737423

申请日：2016-06-20

Applicant: AVL LIST GMBH

Inventor： Helmut Melde-Tuczai ,  Stefan Lichtenegger ,  Gerhard Heimel ,  Bernhard Hoedl

IPC: F02B75/04 ,  F16K11/18 ,  F16K11/048 ,  F16K11/056 ,  F02D15/02 ,  F16C7/06 ,  F16C7/04

Abstract: A length-adjustable connecting rod has a first rod part and a second rod part, with the rod parts being displaceable telescopically toward and/or in one another by means of a length-adjusting means, and with the length-adjusting means being chargeable via a hydraulic channel with a hydraulic medium. The hydraulic channel is fluidly connectable by means of a control device to a hydraulic medium supply channel. The control device has a first and a second valve, each with a valve chamber and each with a valve body that can be pressed by a restorative force against a valve seat. The valve chamber of the first valve is fluidly connected to a first hydraulic channel, and the second valve chamber of the second valve to a second hydraulic channel. The valve bodies are operatively interconnected via a connecting device that can be displaced between a first position and a second position.

公开(公告)号：US11066987B2

公开(公告)日：2021-07-20

申请号：US16487585

申请日：2018-02-23

Applicant: AVL LIST GMBH

Inventor： Siegfried Lösch ,  Alois Fürhapter ,  Gerhard Heimel ,  Bernhard Kometter ,  Uwe Dieter Grebe

IPC: F02B75/04 ,  F16J7/00 ,  F15B21/041 ,  F15B11/16 ,  F16C7/06

Abstract: The invention relates to a method for operating a reciprocating piston machine, particularly an internal combustion engine, having at least one piston rod that is hydraulically adjustable in length for setting a compression ratio, wherein the piston rod comprises a piston and a hydraulic cylinder for adjusting its length, wherein the piston with the hydraulic cylinder delimits at least one working chamber, through the fill level of which at least two switching positions of the piston rod are possible, wherein independently from the setting of the compression ratio the working chamber is at least partially filled and emptied as a function of at least one first predetermined requirement to effect an at least partial exchange of a hydraulic medium in the at least one working chamber.