The system, in this case, is defined to be the fluid (gas) within the cylinder. The gas that is subjected to those changes is called the system. The Otto cycle is a description of what happens to a gas as it is subjected to changes of pressure, temperature, volume, addition of heat, and removal of heat. ![]() It is the thermodynamic cycle most commonly found in automobile engines. The cycle is closed by the exhaust (letter D and colored blue) stroke, characterized by isochoric cooling and isobaric compression processes.Īn Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. Through the combustion of fuel, heat is added in a constant volume ( isochoric process) process, followed by an adiabatic expansion process power (letter C and colored red) stroke. The idealized diagrams of a four-stroke Otto cycle Both diagrams: the intake ( A and colored green) stroke is performed by an isobaric expansion, followed by an adiabatic compression ( B and colored orange) stroke. ![]() Otto cycle pressure–volume diagram Temperature-Entropy diagram
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