Andreas Knecht

Perspektiven des vollvariablen Ventiltriebs Univalve auf Basis eines 2,0-l-Ottomotors

Dieser Beitrag stellt die ersten Versuchsergebnisse eines Vierzylindermotors mit der neuen vollvariablen mechanischen Ventilsteuerung „Univalve“ dar. Sie wird von Hilite/Hydraulik-Ring fur Serien-Verbrennungsmotoren entwickelt; wesentliche Untersuchungen werden an der Technischen Universitat Kaiserslautern durchgefuhrt. Nur durch Anderungen an der Einlassventilseite konnte gegenuber dem ansonsten identischen Basismotor der Verbrauch um bis zu 13 % gesenkt werden. Wesentliche Motorfunktionen wie der Drehmomentverlauf oder das Emissionsverhalten wurden ebenfalls verbessert.

Perspectives of the fully variable valve train univalve on the basis of a 2.0 l spark-ignition engine

This article provides the first test results of a fired four cylinder gasoline engine with the new fully variable valve timing system “Univalve”. This variable valve actuation system is under development by the Hilite / Hydraulik-Ring company for series production engines. The basic investigations are taking place at the University of Kaiserslautern at the institute of combustion engines. Only by changes at the intake valve train, the fuel consumption could be improved by 13 % compared to the otherwise identical basic engine. Essential engine functions like torque and emissions were also clearly improved.

“VaneCAM” the third generation of camshaft adjustment systems

Continuously variable camphasers are now well established for modern spark-ignition engines in high-volume production. With the latest generation of camshaft adjustment systems using the vane-type actuator principle, it is possible to move rapidly and reliably through a large adjustment angle. The layout of these adjusting systems is very simple. The production costs are low in comparison to the first generation of camphasers using spur/helical gears to vary the valve timing. The new-generation systems are mechatronic, with the function depending on the coordination and tuning of hydraulic actuation and engine electronics. The term “VaneCAM” is used for the continuously variable systems of this new generation supplied by Hydraulik- Ring in Nurtingen, Germany.