Design and Optimization of 2-stage Variable Valve Actuation Mechanism for Diesel Engines
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International Journal of Engineering Trends and Technology (IJETT) | 
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| © 2015 by IJETT Journal | ||
| Volume-28 Number-8 |
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| Year of Publication : 2015 | ||
| Authors : Ashish Jain, Dr S S Thipse, Dr E Porpatham |
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| DOI : 10.14445/22315381/IJETT-V28P278 |
Citation
Ashish Jain, Dr S S Thipse, Dr E Porpatham"Design and Optimization of 2-stage Variable Valve Actuation Mechanism for Diesel Engines", International Journal of Engineering Trends and Technology (IJETT), V28(8),412-422 October 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Abstract
The desire for higher fuel economy, improved
performance and drivability expectations of customers from
engines are gradually increasing along with stringent
emission regulations set by the government. There is
customer demand for 4 wheelers having good power, torque
and better fuel economy throughout the speed range of
vehicle and an implied environmental need of improved
emission characteristics. Variable Valve Actuation (VVA)
has been applied to many engines in order to enhance the
engine performance. Many engine manufacturing companies
have started the application of variable valve actuation
mechanism in their next generation vehicles. The 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. There are various ways to
improve to the performance of engine some of which are;
supercharging, turbocharging, variable compression ratio,
variable intake system geometry, variable valve timing and
lift etc. In this work we have concentrated on variable valve
timing and lift for diesel engines. This work presents a novel
two-step VVA mechanism to facilitate variation in valve
timing and lift of base engine. Thus this mechanism helps to
divide the operating speed range of engine into two zones
i.e. low speed and high speed zone and setting a switch over
point, thus helping the engine breath effectively.
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Keywords
Variable Valve Actuation, Valve Lift, Speed
Zone, Valve Event.