Design and control of automotive propulsion systems by Zongxuan Sun, Guoming G. Zhu

By Zongxuan Sun, Guoming G. Zhu

"This e-book provides analytical and experimental equipment and achievements in designing mechanical and mechatronic driveline structures. Examples comprise a number of strength dividing devices, together with symmetric and non-symmetric forms, in addition to open and lockable differentials, a variety of constrained slip differentials, no spins, and viscous clutches. The textual content offers common sense keep an eye on algorithms used to manage car power Read more...

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To close the engine valve, the supply valve is first deenergized. The bottom on-off valve is then opened, which causes the spool of the regulator to return to the ­center position, and thus connects the actuation chamber to the low-pressure reservoir. The spring force becomes dominant, and hence moves the hydraulic piston upward, which starts to close the engine valve. The top on-off valve {4} is closed when the engine valve is near the seat. By the same principle, as explained previously, the spool is deflected in the downward direction, which decreases the orifice area and thus restricts the flow out of the actuation chamber.

As fuel is injected directly into the engine cylinder, the DI fuel system offers great flexibility to the fuel injection strategy with respect to various engine operation modes. In particular, the fuel-air mixture preparation in the combustion chamber has also been identified as one of the key factors that greatly influence the combustion characteristics of the engine performance [52]. Hence, optimizing the fuel mixture homogeneity and avoiding fuel impingement are key engine design parameters.

More importantly, from the valve actuation perspective, they demonstrate the feasibility of operating FFVA systems safely and reliably in the laboratory environment. 1 Challenges for Developing FFVA Systems A production-viable FFVA system must be able to generate precise and robust valve motion with high efficiency and simplified control. In this section we will outline the technical challenges for developing FFVA systems and their implications to system design and control. While the challenges are common to any type of FFVA systems, including electromagnetic, electrohydraulic, and electropneumatic systems, we will focus on the electrohydraulic system in this section.

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