Abstract
An innovating solution for throttle-free load control for spark-ignition engines is variable valve timing system with continuous valve lift (VVTL System, or VVA - Variable Valve Actuation System). A variable valve timing mechanism which can provide continuous valve lift (VVL System) represents a good solution for internal combustion engines to become more efficient, with an improved dynamic performance, to generate fewer emissions by reducing fuel consumption and, furthermore, allows technologies like gasoline direct injection (GDI), homogeneous charge compression ignition (HCCI) / controlled auto ignition (CAI), etc. to perform an optimized operation. In this paper is presented a kinematic analysis, using the analytic method, of a valve timing mechanism with continuous valve lift variation and constant duration. This type of mechanism ensures a continuous valve lift between two extreme valve heights. It is also presented a numerical example, in which the solving principle is based on a numerical method.
Keywords: Timing Mechanism, Variable Valve Lift, Kinematic Analysis, Analytic Method