1500 2000

Output shaft speed (RPM)

Figure 3.10 Torque characteristics of: (a) two-stage turbocharged engine;

—l (b) compound engine with two-2500 stage turbocharger;

(c) differential compound engine

Air in



a Three-speed Gear box

While the DDE was undoubtedly an ingenious method of combining the characteristics of a mechanically supercharged engine with a continuously variable transmission, the DCE which represents a similar concept, but additionally employs a power turbine, clearly exhibits greatly enhanced performance.

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