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Title:-Valve Timing Diagram
Mechanical Engineering Department
Submitted By -
Name : S. Avinash
Section : B
Roll No. : 27
Sem : 6th
Faculty Advisor -
Kishor S. Rambhad
(Asst. Prof. Mech. Engg. Dept.)
Session 2016-17
Subject – Energy conversion-II
TAE II: Technical Presentation
VALVE TIMING
In a piston engine, the valve timing is the precise timing of the opening and closing
of the valves. In an internal combustion engine those are usually poppet valves and
in a steam engine they are usually slide valves or piston valves.
In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is
controlled by the camshaft. It can be varied by modifying the camshaft, or it can be
varied during engine operation by variable valve timing. It is also affected by the
adjustment of the valve mechanism, and particularly by the tappet clearance.
However, this variation is normally unwanted.
Valve overlap
With traditional fixed valve timing, an engine will have a period of
"valve overlap" at the end of the exhaust stroke, when both the intake
and exhaust valves are open. The intake valve is opened before the
exhaust gases have completely left the cylinder, and their considerable
velocity assists in drawing in the fresh charge. Engine designers aim to
close the exhaust valve just as the fresh charge from the intake valve
reaches it, to prevent either loss of fresh charge or unscavenged exhaust
gas. In the diagram, the valve overlap periods are indicated by the
overlap of the red and blue arcs.
Key:
TDC = Top dead centre
BDC = Bottom dead centre
IO = Inlet valve opens
IC = Inlet valve closes
EO = Exhaust valve opens
EC = Exhaust valve closes
The Inner Workings of Variable Valve Timing
Variable Valve Timing (VVT) is a way to advance/retard valve timing, and
change duration, overlap and even lift in some applications while the engine
is running.
VVT is computer-controlled and typically uses oil pressure to change the
position of a phaser mechanism on the end of the camshaft to advance or
retard cam timing.
VvT has been used on numerous Japanese (Honda, Nissan and Toyota) and
European (Audi, BMW, Mercedes and VW) engines since the late 1980s and
early 1990s, but only in the last decade or so on domestic engines (such as
Ford 4.6L V8s, Chrysler 2.4L and 3.6L VVT engines, Chevy 2.4L Ecotec,
etc.).
On overhead cam engines where there are separate cams for the intake and
exhaust valves, changing the timing of one cam also changes the effective
duration and overlap, and on engines where VVT also involves activating
extra cam lobes or changing the rocker arm fulcrum point, VVT can also
change total valve lift.
Thank you
Thank you

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Valve timing diagram

  • 1. Title:-Valve Timing Diagram Mechanical Engineering Department Submitted By - Name : S. Avinash Section : B Roll No. : 27 Sem : 6th Faculty Advisor - Kishor S. Rambhad (Asst. Prof. Mech. Engg. Dept.) Session 2016-17 Subject – Energy conversion-II TAE II: Technical Presentation
  • 2. VALVE TIMING In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In an internal combustion engine those are usually poppet valves and in a steam engine they are usually slide valves or piston valves. In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance. However, this variation is normally unwanted.
  • 3.
  • 4. Valve overlap With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers aim to close the exhaust valve just as the fresh charge from the intake valve reaches it, to prevent either loss of fresh charge or unscavenged exhaust gas. In the diagram, the valve overlap periods are indicated by the overlap of the red and blue arcs. Key: TDC = Top dead centre BDC = Bottom dead centre IO = Inlet valve opens IC = Inlet valve closes EO = Exhaust valve opens EC = Exhaust valve closes
  • 5. The Inner Workings of Variable Valve Timing Variable Valve Timing (VVT) is a way to advance/retard valve timing, and change duration, overlap and even lift in some applications while the engine is running. VVT is computer-controlled and typically uses oil pressure to change the position of a phaser mechanism on the end of the camshaft to advance or retard cam timing. VvT has been used on numerous Japanese (Honda, Nissan and Toyota) and European (Audi, BMW, Mercedes and VW) engines since the late 1980s and early 1990s, but only in the last decade or so on domestic engines (such as Ford 4.6L V8s, Chrysler 2.4L and 3.6L VVT engines, Chevy 2.4L Ecotec, etc.). On overhead cam engines where there are separate cams for the intake and exhaust valves, changing the timing of one cam also changes the effective duration and overlap, and on engines where VVT also involves activating extra cam lobes or changing the rocker arm fulcrum point, VVT can also change total valve lift.