Global Journal of Engineering, Design & Technology
Open Access

Abstract

Improvement of Full-Load Performance of an Automotive Engine Using Adaptive Valve Lift and Timing Mechanism..

Taib Iskandar Mohamad

This paper describes an improvement of full-load performance of an internal combustion engine using Adaptive Valve Lift and Timing Mechanism (AVLT). AVLT enables engine power improvement by increasing valve timing and lift at high engine speed and load operating regions. It utilizes engine fluids pressure difference with respect   to engine speed to actuate the AVLT mechanism which will make the valve lift higher and longer duration at higher engine speed and loads. Since engine speed and load can be linearly correlated to these pressures, a mechanical sliding arm valve actuation mechanism is constructed based on their transient behavior. Therefore, a continuously dynamic valve lift profile with respect to engine speed can be achieved to increase brake power of the engine. Dynamics analysis performed using MSC Adam software showed that tappet translation increased by 32% from 9.09 mm to 12.01 mm by varying translational skate position between 0o and 10o..

Published Date: 2020-07-31; Received Date: 2020-06-18