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Explain SEQUENTIAL TURBOCHARGING method?

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  • Explain SEQUENTIAL TURBOCHARGING method?

    Explain SEQUENTIAL TURBOCHARGING method?


  • #2

    • The ST system consists of two or more turbochargers in parallel, and these turbochargers are put into or out of operation regarding diesel engine operation points.
    • This system can improve the turbochargers matching with the engine, so the efficiency of the turbocharger and boost pressure are both improved.
    • It refers to a setup in which the motor utilizes one turbocharger for lower engine speeds, and a second or both turbochargers at higher engine speeds.
    • During low to mid engine speeds, when available spent exhaust energy is minimal, only one relatively small turbocharger (called the primary turbocharger) is active. During this period, all of the engine's exhaust energy is directed to the primary turbocharger only, providing the small turbo's benefits of a lower boost threshold, minimal turbo lag, and increased power output at low engine speeds.
    • As rpm increases, the secondary turbocharger is partially activated to pre-spool before its full utilization. Once a preset engine speed or boost pressure is attained, valves controlling compressor and turbine flow through the secondary turbocharger are opened completely. (The primary turbocharger is deactivated at this point in some applications.)
    • In this way, a full twin turbocharger setup provides the benefits associated with a significant turbo, including maximum power output, without the disadvantage of increased turbo lag.
    • Sequential turbocharging (ST) system is a useful measure to improve the fuel economy performance and the transient responsive performance and to reduce the smoke emission at low speed.

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