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25-01-2012, 04:38 PM
Post: #1
Smile camless engine ppt

i want some ppt on camless engines which should consists of min of 25 slides
11-02-2012, 11:56 AM
Post: #2
RE: camless engine ppt
to get information about the topic camless engine full report ,ppt and related topic refer the link bellow



15-08-2012, 10:41 PM
Post: #3
RE: camless engine ppt
thank you for uploading that useful papers
05-07-2013, 02:50 PM
Post: #4
RE: camless engine ppt

.ppt  CAMLESS ENGINES.ppt (Size: 2.55 MB / Downloads: 55)



Control the breathing channels (valves) of an IC engine
Connected to camshaft which is operated by crankshaft
Cams push open valves at proper time & guide their closure
But they are inflexible except VTEC & VVT-I
Engineers could not vary timing, lift & duration of valve opening infinitely

Working of conventional engines

The crankshaft turns camshaft which operates valves by mechanism as in figure
Spring brings back valve to initial position
Timing of engine valves depends on shape of cams

Conventional engine valves

Engineers must design cams in the development stages
This design compromises b/n engine power & fuel efficiency
Considering this compromise automobile companies brought variable valve timing mechanisms
But is effects were limited


It is a electro-hydraulic camless valve train (ECV)
Uses elastic property of compressed hydraulic fluid which acts like a liquid spring, accelerates & decelerates the valves


Offers continuously variable & independent control of all aspects of valve motion - lift, operation duration, event of opening
ECV system can control valve velocity, valve acceleration and deceleration


Opening & closing of valves requires some power-
Electromechanical- alternator
Electrohydraulic- accumulator
Sophisticated electronic control required for gentle seating of valves
Current solenoids cannot run at high rpms;
Hidden cost of microprocessor & software controls


Even though some disadvantages are present, we can expect electrohydraulic & electromechanical valves to replace the conventional camshaft technology.
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