Stroke (engine)
From Wikipedia, the free encyclopedia
A stroke is a single action of certain engines.
In a steam, Otto or Diesel piston engine, a stroke is the action of a piston travelling the full length of its cylinder in one direction.
The stroke length is determined by the cranks on the crankshaft. Stroke can also refer to the distance the piston travels; for example, the phrase "This engine has a four inch stroke" means that on each stroke, the piston travels four inches. Bore is the diameter of the cylinder, which means that engine displacement is dependent on both the bore and the stroke of the cylinder.
In a pistonless rotary engine, the term is applied to the corresponding rotor movement, see top dead centre.
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[edit] Intake stroke
The intake stroke, or induction stroke, is the first stroke in a four-stroke internal combustion engine cycle. It involves the downward movement of the piston, creating a partial vacuum that draws a fuel/air mixture into the combustion chamber.
[edit] Compression stroke
The compression stroke is the second of four stages in an otto cycle or diesel cycle internal combustion engine.
In this stage, the mixture (in the case of an Otto engine) or air (in the case of a Diesel engine) is compressed to the top of the cylinder by the piston until it is either ignited by a spark plug in an Otto engine or, in the case of a Diesel engine, reaches the point at which the fuel which has been injected spontaneously combusts, forcing the piston back down.
Compression serves to increase the proportion of energy which can be extracted from the hot gas and should be optimised for a given application. Too high a compression can cause detonation which is undesirable compared with a smooth, controlled burn. Too low a compression may result in the fuel/air mixture still burning when the piston reaches the bottom of the stroke and the exhaust valve opens.
[edit] Power stroke
A power stroke is, in general, the stroke of a cyclic motor which generates force. It is used in describing mechanical engines. In 5events 4 stroke engine a power stroke happens once in two rotation of crank shaft while in 2stroke it happens two in similar case.
[edit] Exhaust stroke
The exhaust stroke is the fourth of four stages in an internal combustion engine cycle. In this stage gases remaining in the cylinder from the fuel ignited during the compression step are removed from the cylinder through an exhaust valve at the top of the cylinder. The gases are forced up to the top of the cylinder as the piston rises and are pushed through the opening which then closes to allow fresh air/fuel mixture into the cylinder so the process can repeat itself.
[edit] See also
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