Thermodynamic Cycles

Interactive P-V, T-S, and H-S diagrams for common thermodynamic cycles.

Otto Cycle
Idealized spark-ignition (gasoline) engine — isochoric heat addition, interactive compression ratio
Diesel Cycle
Compression-ignition engine — isobaric (constant-pressure) heat addition via fuel injection, adjustable cutoff ratio
Atkinson / Miller Cycle
Overexpanded Otto variant used in hybrids — expansion ratio exceeds compression ratio, efficiency comparison included