Cosic, Ivan (2003) Development and testing of a variable valve timing system (VVT) for a twincam automotive engine. Research Master thesis, Victoria University of Technology.

Abstract

Variable valve timing (VVT) is an innovative design that enhances automotive engine performance and is important in addressing fuel consumption and emission output concerns. The purpose of the research reported here was to examine the concept of a VVT system because it had the promise of application in the advancement of engine technology. In this study, a new VVT system, termed the dynamic valve control (DVC) system was developed. The DVC system was modeled using the computer simulation software package ADAMS, which determined the forces acting on the principal components at operational speeds, as well as the valve timing and lift profile of the system. Stress analysis of the rocker arm was carried out using Cosmos/DesignStar software. The valve timing and lift characteristics of the DVC system were compared to an existing standard production engine. The results of the study showed that the proposed DVC system can essentially realise closure of its valves and achieve variable valve lift. In addition, the DVC system valve timing and lift profile showed better characteristics when compared with those of an existing Holden Vectra 2.0 litre twincam engine.

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