Kinematic Design and Simulation of a Flexible Valve Lift Mechanism for an IC Engine

International Journal of Mechanical Engineering

© 2015 by SSRG - IJME Journal

Volume 2 Issue 8

Year of Publication : 2015

Authors : Manjunath Gowda M.R, Harish Kumar R, N.S.Venktesh Guptha

10.14445/23488360/IJME-V2I8P103

How to Cite?

Manjunath Gowda M.R, Harish Kumar R, N.S.Venktesh Guptha, "Kinematic Design and Simulation of a Flexible Valve Lift Mechanism for an IC Engine," SSRG International Journal of Mechanical Engineering, vol. 2,  no. 8, pp. 4-10, 2015. Crossref, https://doi.org/10.14445/23488360/IJME-V2I8P103

Abstract:

 The automotive industry has been under continued pressure to improve the fuel efficiency owing to stringent pollution norms, global warming and rising petroleum prices. Various technologies have been developed in the recent years to mitigate these problems, common ones among them being, fuel cut off &/or cylinder deactivation during deceleration, enabling new combustion strategies, incorporating electronic valve lift/timing mechanism etc. Traditionally in IC-engines, the inlet and exhaust valve opening/lift is a fixed function of the crank shaft position. However in the light of new fuel induction systems that are currently available in recent and modern engines, significant improvements in fuel economy can be achieved if these values are actuated as a variable function of the crankshaft angular displacement through individual control of valve timing or by using electronically controlled valve timing mechanisms referred to as variable valve timing (VVT) mechanisms. However in VVT cam mechanisms, the major problems is due to the noise and wear associated with high contact velocities during the opening and closing of valves. The other major problem is that, to date, 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-LOBEDCAM” mechanism used in conjunction with a conventional cam operating mechanism that axially shifts the camshaft through a small displacement depending on the operating conditions of the engine 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 of the valve actuator mechanism is expected to overcome the inherent limitations of the fixed cam valve actuation mechanisms as well as the deficiencies of the VVT cam systems marginally.

Keywords:

Crank Shaft, Variable Valve timing, TRI-LOBED-CAM, Valve dynamics

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