An i-VTEC is new technology introduce by the honda in the field of automobile. This technology is most famous and installed in all cars of the honda. In this presentation on i-VTEC you will find all about it like its working principle, its performance, its advantages and disadvantages and further development in this technology. A complete illustration about this technolgy is given in this presentation.

1. A SEMINAR
ON
I-VTEC ENGINE
Submitted to Submitted by
Rahul Sharma Sir Yogendra Singh Shekhawat

2. INDEX
 Introduction& Defination
 What is i-vtec
 ECU
 Working
 History
 Advantages
 Conclusion
 Reference

3. Introduction
 VTEC(Variable valve timing & lift electronic
control) is a valve train system developed by
honda.
 Improve the volumetric efficiency of a four
stroke internal combustion engine.
 The Vtec system uses two camshaft profiles
and electronicaly selects between the profiles.
 This was the first system of ths kind.

4. What is I-vtec
 The i stands for intelligent: i-VTEC is intelligent-VTEC.
 Honda introduced many new innovations in i-VTEC, but
the most significant one is the addition of a variable
valve opening overlap mechanism to the VTEC system.
Named VTC for Variable Timing Control
 the current (initial) implementation is on the intake
camshaft and allows the valve opening overlap between
the intake and exhaust valves to be continuously varied
during engine operation.
 This allows for a further refinement to the power delivery
characteristics of VTEC, permitting fine-tuning of the
mid-band power delivery of the engine.

5. I-vtec

6. I-VTEC System

7. Working- VTEC (which stands for Variable Valve Timing and Lift
Electronic Control) is an electronic and mechanical system in
some Honda engines that allows the engine to effectively have
multiple camshafts. As the engine moves into different rpm
ranges, the engine's computer can activate alternate lobes on
the camshaft and change the cam's timing.
 At low RPM the loich push the exhaust and intake
valve would open and closed by means of rocker arm
are the two smaller ones
 for maximum engine performance at low engine
speeds the valve needs to open and closed differently
then they do at higher speed.

8.  This is good for volumetric efficiency.
 At the high RPM by contrast a solenoid
injects more oil into the rocker arm which
forces two pins in the larger central rocker
arm.
 When the larger central lobe is active that
time the two smaller lobes do not control
the valve control and the opening and
closing of intake and exaust valve.

9. history
 It was invented by Honda R&D engineer
Ikuo Kajitani
 In the regular four-stroke automobile
engine, the intake and exhaust valves are
actuated by lobes on a camshaft.
 The shape of the lobes determines the
timing, lift and duration of each valve.

10.  Timing refers to an angle measurement of
when a valve is opened or closed with
respect to the piston position (TDC or
BDC).
 Lift refers to how much the valve is
opened.
 Duration refers to how long the valve is
kept open.
 the optimal valve timing, lift and duration
settings under low RPM engine operations
are very different from those under high
RPM.

11. Performance
This new engine utilizes Honda's "VTEC"
technology, which adjusts valve timing and lift
based on the engine's RPM, but adds "VTC" -
Variable Timing Control - which continuously
modulates the intake valve overlap depending
on engine load. The two combined yield in a
highly intelligent valve timing and lift
mechanism.In addition to such technology,
improvements in the intake manifold, rearward
exhaust system, lean-burn-optimized catalytic
converter help to create an engine

12. Reduced Noise Level
 There is no mechanical device is using in
this technology so the noise and vibration
produced by
the system is comparatively low.
 The Electronic control and multiple
injections reduced noise to a great extent.

13. Scope For Further Development
 Use of different fuels for zero emissions and
better engine performance
 Lowering the cost
 VTEC remains one of the most important
solutions to balancing low emissions
 It also stand for high performance

14. Advantages
 Better fuel efficiency
 High initial torque with relevant high
power.
 Lower emission.
 Strong performance.

15. Limitations
 Higher cost of engine.
 More complex mechanism
 Wear and Tear problems.
 Failed to overcome turbo charging.
 Decreased engine life.

16. Conclusion
 VTEC system is more sophisticated than earlier variable-
valve-timing systems, which could only change the time
both valves are open during the intake/exhaust overlap
period on the transition between the exhaust and
induction strokes.
 By contrast, the i-VTEC setup can alter both camshaft
duration and valve lift. i-VTEC Technology gives us the
best in vehicle performance. Fuel economy is increased,
emissions are reduced, derivability is enhanced and
power is improved.

19. For more visit
www.studyhubz.com
Yogendra Singh Shekhawat
Mechanical Engineering