Advanced diesel valvetrain system design

As the first chapter in Part III, this chapter starts to bridge the thermo-fluid topics and the mechanical considerations such as dynamic vibration, friction, and noise in diesel engine system design. As a unique system that has dual characteristics of both air system and mechanical system, the valvetrain controls engine gas flows, volumetric efficiency and engine delta P, subject to mechanical design constraints. This chapter first summarizes the design guidelines of the conventional valvetrain with an integrated analytical approach by simultaneously considering engine breathing performance and valvetrain dynamics in valvetrain design that includes the cam and the valve spring. It then investigates the performance of variable valve actuation (VVA) and its interactions with other air system components. A theory of using VVA to control pumping loss is developed. The benefits of cylinder deactivation for the diesel engine are also analyzed.

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