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Design of tri lobed cam and finding the effect on emission for a flexible valve lift actuation mechanism in IC engine

Author: 
Manjunath Gowda, M. R., Harish Kumar, R. and Venkatesh Gupta, N. S.
Subject Area: 
Physical Sciences and Engineering
Abstract: 

In conventional engine design, the camshaft uses a fixed or variable cam profile to achieve a reasonable compromise between idle speed stability, fuel economy, and torque performance. Significant improvements in engine performance can be achieved through individual control of the valve timing. The cams open the valves (lift) for a certain amount of time (duration) during each intake and exhaust cycle. So In internal combustion engines, Variable valve timing (VVT), also known as Variable valve actuation (VVA), is a generalized term used to describe any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine. The major problem in variable valve timing (VVT) mechanism is that, the valve actuators for these types of applications primarily rely on resonant spring arrangements to achieve the required valve dynamics. This leads to a fixed amplitude of the valve trajectory and only allows for variable valve timing unless a fully flexible valve actuation system is conceived and designed. An attempt is made in the proposal research work to design a new “TRI-LOBED-CAM” mechanism used in conjunction with a conventional cam operating mechanism. By placing the rocker at 3 different locations on the CAM Shaft the valve movement is varied viz., minimum valve displacement at lean loads/low engine speeds, medium valve displacement at intermediate loads and maximum valve displacement at high loads/high engine speeds. The proposed new design gives a fully flexible valve actuation motion of the engine. An emission characteristic is studied at 3 different profiles of cam where the emission is decreased.

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