Page "Otto cycle" Paragraph 2

Temperature-Entropy diagram The idealized diagrams of a four-stroke Otto cycle Pressure volume diagram | Both diagrams: the < span style =" margin: 1px ; background :# 10ff00 ;"> intake ( A ) </ span > stroke is performed by an Isobaric process | isobaric expansion, followed by an Adiabatic process | adiabatic < span style =" margin: 1px ; background :# ffae21 ;"> compression ( B ) </ span > stroke.

Through the combustion of fuel, heat is added in an isochoric process, followed by an adiabatic expansion process, characterizing the < span style =" margin: 1px ; background :# f00 ;"> power ( C ) </ span > stroke.

The cycle is closed by the < span style =" margin: 1px ; background :# 2060ff ;"> exhaust ( D ) </ span > stroke, characterized by isochoric cooling and isobaric compression processes.