Camless ic engine using solenoid valve and decoder
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Page 1 WORKING MODEL OF I.C. ENGINE WITHOUT CAM MANISH KUCHA (09ME23) GAUTAM KUNDARIA (09ME24) BALKRISHN PATEL (09ME31) DARSHAN PATEL (09ME32) Guided By :
Transcript
Diapositive 1MANISH KUCHA (09ME23)
GAUTAM KUNDARIA (09ME24)
BALKRISHN PATEL (09ME31)
DARSHAN PATEL (09ME32)
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INTRODUCTION
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Valve Operating Mechanism
The valve mechanism operations consist of cam, tappet, rocker arm,
spring and valves. The cam is the most important member of valve
operating mechanism. Cam shape plays major role in operating
characteristics of engine. Shape of the lobe determines
When the valves open, and
How long they open .
This determines the amount of valve overlap. The cam controls the
amount of air-fuel mixture that suck into the cylinder.
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CAM:
It is device which converts rotary motion of camshaft to the linear
motion of valves.
The camshaft is driven by crankshaft by a pair of meshing gears or
sprocket connected by chain called as timing chain.
The valve is opened by the positive mechanical action of the cam
lobe and it is closed by spring pressure
Since the timing of the engine is dependent on the shape of the cam
lobe and the rotational velocity of camshaft.
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Disadvantages
As in motion transmission increases the power loss due to friction
increases and hence reduction in output of the engine.
Frequent use of cam lead to change in shape of cam which affects
valve timing.
Metal to metal contact lead to noise and thermal losses.
In conventional engine the push rod and rocker arm impose some
inertia, which affects valve action .
Cam design is very difficult for max. power and efficiency.
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PROTOTYPE OF CAMLESS IC ENGINE
The solenoid valves is in such a way that valves opens and closes
in accordance with piston positions, which lead to soft and gradual
landing, opening, closing and overlapping of valves.
Absolute Encoder:
Absolute Encoder
A rotary encoder, also called a shaft encoder, is an
electro-mechanical device that converts the angular position or
motion of a shaft or axle to an analog or digital code. The output
of incremental encoders provides information about the motion of
the shaft which is typically further processed in PLC.
The output of absolute encoders indicates the current position of
the shaft.
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A solenoid is a coil of low resistance wire.
They work on the principle that a current travelling through a wire
generates a magnetic field. If, as in a solenoid, a wire is
continually wound tightly together a magnetic field is
created.
This field acts perpendicular to the wire coil (along the axis of
the solenoid).
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The mechanical construction of a solenoid can be seen in
figure.
The force generated by a solenoid is directly proportional to the
current being applied to the solenoid and inversely proportional to
the square of the distance between the plunger and the solenoid
coil.
The magnetic field strength is given by:
B=μ0nI
where B = is the field strength in Tesla
n is the number of turns in the solenoid divided by its
length
I is the current flowing through the solenoid.
The force generated is:
Conti..
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ADVANTAGE
Page 910-918
Engine”, Dhanpat Rai Publication ,200,Page 491-496
[3] I.Gould,W. Richeseson and F.Erikson, “Performance of
Camless
Engine Using valve Actuator with Programmable Timing ”,
SAE,1991