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  • IC Engine - ICE
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WORKING PRINCIPLE • IC engine can work on any one of the following cycles:  Constant volume or Otto cycle  Constant pressure or Diesel cycle  Dual combustion cycle • These may be either four stroke or two stroke cycle engines Indicator Diagram: A graph between pressure and volume; the former being taken on vertical axis and the later on the horizontal axis. This is obtained by an instrument called Indicator. The indicator diagram are of two types: (a) Theoretical or hypothetical and (b) Actual. Theoretical indicator diagram is always longer in size compared to the actual since losses are neglected in the former. 2 SKNAYAK

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WORKING PRINCIPLE A. Otto Engines: (SI Engines) • Used in petrol engines, gas engines, light oil engines in which the mixture of air and fuel are drawn in the engine cylinder. Since ignition in these engines is due to spark, so are called Spark Ignition Engines. The various strokes of a four stroke (Otto) cycle engine are:  Suction Stroke  Compression Stroke  Expansion or power Stroke  Exhaust Stroke 3 SKNAYAK

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WORKING PRINCIPLE • Suction Stroke: • Also known as induction stroke. The piston moves from TDC to BDC, the inlet valve opens and proportionate fuel air mixture is sucked in the engine cylinder. The exhaust valve remains closed throughout the stroke. Compression Stroke: The piston moves towards T.D.C. and compresses the enclosed fuel air mixture drawn in the engine cylinder during suction. The pressure of the mixture rises in the cylinder to a value of about 8 bar. Just before end of this stroke the operating plug initiates a spark which ignites the mixture and combustion takes place at constant volume. Both inlet and exhaust valves remain closed during the stroke. 5 SKNAYAK

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