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manish shankar
manish shankar • Aug 24, 2008

Need information about cam less ic engines

hi friends

i need more information about camless i.c.engines

what it is i described it here


camless" design that promises to deliver the internal-combustion engine's biggest efficiency improvement in years. The aim of all this effort is liberation from a constraint that has handcuffed performance since the birth of the internal-combustion engine more than a century ago. Camless engine technology is soon to be a reality for commercial vehicles. In the camless valvetrain, the valve motion is controlled directly by a valve actuator - there's no camshaft or connecting mechanisms. Precise electronic circuit controls the operation of the mechanism, thus bringing in more flexibility and accuracy in opening and closing the valves.
TheBugInYou
TheBugInYou • Aug 24, 2008
manish shankar
hi friends

i need more information about camless i.c.engines

what it is i described it here


camless" design that promises to deliver the internal-combustion engine's biggest efficiency improvement in years. The aim of all this effort is liberation from a constraint that has handcuffed performance since the birth of the internal-combustion engine more than a century ago. Camless engine technology is soon to be a reality for commercial vehicles. In the camless valvetrain, the valve motion is controlled directly by a valve actuator - there's no camshaft or connecting mechanisms. Precise electronic circuit controls the operation of the mechanism, thus bringing in more flexibility and accuracy in opening and closing the valves.
Here is some information i found...


Increased efficiency, reduced emissions, and improved power over existing internal combustion engines are the three primary objectives and anticipated results of the research currently underway at the University of South Carolina. The research focuses on the development of a camless engine and addresses several of the design limitations of earlier camless attempts.


Camless Engine Theory
Since the origination of the automobile, the internal combustion engine (ICE) has evolved considerably. However, one constant has remained throughout the decades of internal combustion engine development. The camshaft has been the primary means of controlling the valve actuation and timing, and therefore, influencing the overall performance of the vehicle.
The camshaft is attached to the crankshaft of an ICE and rotates relative to the rotation of the crankshaft. Therefore, as the vehicle increases is velocity, the crankshaft must turn more quickly, and ultimately the camshaft rotates faster. This dependence on the rotational velocity of the crankshaft provides the primary limitation on the use of camshafts.
As the camshaft rotates, cam lobes, attached to the camshaft, interface with the engine’s valves. This interface may take place via a mechanical linkage, but the result is, as the cam rotates it forces the valve open. The spring return closes the valve when the cam is no longer supplying the opening force. Figure 1 shows a schematic of a single valve and cam on a camshaft.
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Since the timing of the engine is dependent on the shape of the cam lobes and the rotational velocity of the camshaft, engineers must make decisions early in the automobile development process that affect the engine’s performance. The resulting design represents a compromise between fuel efficiency and engine power. Since maximum efficiency and maximum power require unique timing characteristics, the cam design must compromise between the two extremes.


This compromise is a prime consideration when consumers purchase automobiles. Some individuals value power and lean toward the purchase of a high performance sports car or towing capable trucks, while others value fuel economy and vehicles that will provide more miles per gallon. ​
Recognizing this compromise, automobile manufacturers have been attempting to provide vehicles capable of cylinder deactivation, variable valve timing (VVT), or variable camshaft timing (VCT). These new designs are mostly mechanical in nature. Although they do provide an increased level of sophistication, most are still limited to discrete valve timing changes over a limited range.


Current Prototype...

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[​IMG]


[​IMG]
rampon77
rampon77 • Aug 30, 2008
manish shankar
hi friends

i need more information about camless i.c.engines

what it is i described it here


camless" design that promises to deliver the internal-combustion engine's biggest efficiency improvement in years. The aim of all this effort is liberation from a constraint that has handcuffed performance since the birth of the internal-combustion engine more than a century ago. Camless engine technology is soon to be a reality for commercial vehicles. In the camless valvetrain, the valve motion is controlled directly by a valve actuator - there's no camshaft or connecting mechanisms. Precise electronic circuit controls the operation of the mechanism, thus bringing in more flexibility and accuracy in opening and closing the valves.





hi friend .......
can u give some information about camless ic engines😁
rampon77
rampon77 • Aug 30, 2008
TheBugInYou
Here is some information i found...


Increased efficiency, reduced emissions, and improved power over existing internal combustion engines are the three primary objectives and anticipated results of the research currently underway at the University of South Carolina. The research focuses on the development of a camless engine and addresses several of the design limitations of earlier camless attempts.



Camless Engine Theory

Since the origination of the automobile, the internal combustion engine (ICE) has evolved considerably. However, one constant has remained throughout the decades of internal combustion engine development. The camshaft has been the primary means of controlling the valve actuation and timing, and therefore, influencing the overall performance of the vehicle.
The camshaft is attached to the crankshaft of an ICE and rotates relative to the rotation of the crankshaft. Therefore, as the vehicle increases is velocity, the crankshaft must turn more quickly, and ultimately the camshaft rotates faster. This dependence on the rotational velocity of the crankshaft provides the primary limitation on the use of camshafts.
As the camshaft rotates, cam lobes, attached to the camshaft, interface with the engine’s valves. This interface may take place via a mechanical linkage, but the result is, as the cam rotates it forces the valve open. The spring return closes the valve when the cam is no longer supplying the opening force. Figure 1 shows a schematic of a single valve and cam on a camshaft.
[FONT="][​IMG][/FONT]


Since the timing of the engine is dependent on the shape of the cam lobes and the rotational velocity of the camshaft, engineers must make decisions early in the automobile development process that affect the engine’s performance. The resulting design represents a compromise between fuel efficiency and engine power. Since maximum efficiency and maximum power require unique timing characteristics, the cam design must compromise between the two extremes.



This compromise is a prime consideration when consumers purchase automobiles. Some individuals value power and lean toward the purchase of a high performance sports car or towing capable trucks, while others value fuel economy and vehicles that will provide more miles per gallon. ​

Recognizing this compromise, automobile manufacturers have been attempting to provide vehicles capable of cylinder deactivation, variable valve timing (VVT), or variable camshaft timing (VCT). These new designs are mostly mechanical in nature. Although they do provide an increased level of sophistication, most are still limited to discrete valve timing changes over a limited range.


Current Prototype...

[​IMG]

[​IMG]


[​IMG]

hi shankar ......
im rampon doing mech 3 rd yr .....
can u plz mail me the information elaborately that u hav collected.....
my mail id is rampon77@rediffmail.com
keerthicoca
keerthicoca • Dec 27, 2008
i would like to know the complications involved in the functioning and in manufacturing a camless ic engine

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