Development of a Three-Phase Sequential Turbocharging System with Two Unequal-Size Turbochargers

Table 2

Valves actions in switching processes.

Switching boundary	Switching process	Valves actions
		VBC	VBT	VSC	VST
First switching boundary	Small TC→big TC	Open	Open	Close	Close
	Big TC→small TC	Close	Close	Open	Open
Second switching boundary	Big TC→2TC	/	/	Open	Open
	2TC→big TC	/	/	Close	Close