Search Results

Variable valve Actuation (VVA) systems are being increasingly used in IC engine. Recently novel valve actuation mechanism like continuous variable valve lift (CVVL) is being explored to regulate engine output without conventional throttle valve and this reduces the pumping losses especially at part load in SI engines. In this paper numerical model for the kinematic analysis of a CVVL mechanism is presented using MATLAB. It consists of eccentric shaft fitted with a series of intermediate rocker arm, which in turn control the degree of valve lift. The main characteristic of this mechanism is that it uses a general curve contact between the elements, which is determined using theory of envelope curve. The mechanism’s system of equations solving principle is based on the Newton-Raphson numerical method.