Abstract
Abstract: The paper is focused on the synthesis and analysis of a variable valve lift and timing (VVLT) mechanism, used to enhance the fuel consumption in the low part loads operation. This mechanism is self-regulated thanks to a hydro-mechanical system, which is the subject of a French patent and allows a continuously intake valve lift and opening variation. The synthesis, which consisted in finding out the required intake cam profile starting from an imposed intake valve law, is performed analytically. Then, by using the obtained cam profile, it has been checked out via Catia software whether the resulted intake valve law coincides with the imposed law used when performing the analytical synthesis. Once this validated, the analysis of the VVLT mechanism is done by using Catia software. Therefore, the envelope of the valve lifts for the entire engine´s operation is found and explained. This work is being developed thanks to the financial support of the Romanian Council for Scientific Research in the Higher Education (CNCSIS-CEEX) and the French Agency for the Environment (ADEME).
Keywords: Variable Intake Valve Lift and Timing, synthesis, analysis, Catia, throttle-less.