i-vtec engine technology
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Transcript of i-vtec engine technology
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GLA University
i-vtec engine technology
Submitted By :- Submitted To :- Rahul Soni Mr. R P SinghSec:- F Mr. Shashank SrivastavaRoll No:- 121200229 (07)
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Contents
Introduction Basic Mechanism Principals I-VTEC Controller Series of VTEC engine I-VTEC I-VTEC in Motorcycles Advantages Limitations Future of I-VTEC
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INTRODUCTION I-VTEC (Variable Valve Timing and Lift Electronic
Control) is a valve train system developed by Honda
improve the volumetric efficiency of a four stroke internal combustion engine .
The I-VTEC system uses two camshaft profiles and electronically selects between the profiles.
It was invented by Honda engineer Ikuo Kajitani.
This was the first system of its kind.
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BASIC MECHANISMS
The basic mechanism used by the i-vtec technology is hydraulically actuated pin.
Pin reached to rocker arms. A spring mechanism used to
return the pin back. Comprises of two camshaft
lobes.
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WORKING:-
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This is done by running in a low speed valve timing and small cam profile at low engine speeds for improved fuel consumption and leaner fuel burning. On the other hand, when the engine needs more power a higher output is achieved through the i-VTEC system by speeding up the valve timing and switching to the larger cam profile which allows for a further and longer valve opening time.
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PRINCIPALS One of the cam lobes on the left hand
have a wider profile , opens its valve earlier.
For more time and close it later in compare to the other.
The fuel is allowed to enter through one valve completely , while other valve opens partly.
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i-VTEC CONTROLLER
Basically a RPM activated.
ECU used to switch cams to early/late.
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SERIES OF VTEC ENGINES
SOHC VTEC VTEC –E 3 STAGE VTEC I- VTEC K-series R-series
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I-VTEC
The intake camshaft is now capable of advancing between 25 and 50 degrees.
Phasing is implemented by a computer-controlled, oil-driven adjustable cam gear.
I-VTEC V6 that includes Honda's cylinder deactivation technology.
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i-VTEC IN MOTORCYCLES
Firstly used in 2003 in sports bikes.
One intake valve remains closed until a threshold of 7000 rpm is reached.
Second valve is opened by an oil-pressure actuated pin.
Uses a single camshaft to provide two timing routines for the intake .
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ADVANTAGES
Better fuel efficiency.
High initial torque with relevant high power.
Lower emission.
Strong performance.
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LIMITATIONS
Higher cost of engine.
More complex mechanism.
Wear and Tear problems.
Failed to overcome turbo charging.
Decreased engine life.
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FUTURE OF i-VTEC
Implementation on performance engines.
Better opportunities of higher petroleum prices.
Consideration on its disadvantages gives improvement in it.
Economy and satisfaction to be estimated.
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REFRENCES
WIKIPEDIA.ORG SEMINARTOPICS.COM PAPERPRESENTATION.COM
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C
HTF