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One method for reducing the pumping work in throttled spark-ignition engines is early intake valve closing...

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Mechanical Engineering

One method for reducing the pumping work in throttledspark-ignition engines is early intake valve closing (EIVC). WithEIVC, the inlet manifold is held at a pressure pi, which is higherthan the normal engine intake pressure pi*. The intake valve closesduring the intake stroke. The trapped fresh charge and residual isthen expanded to the normal cycle (lower) intake pressure, pi*. Youcan assume that both cycles have the same mass of gas in thecylinder, temperature and pressure at state 1 of the cycle.

a) Sketch a p-V diagram including both the standard and EIVCcycle. On the p-V diagram, shade the area that corresponds to thedifference of pumping work between the standard and EIVCcycles.

b) What value of intake pressure pi and VEIVC will give themaximum reduction in pumping work for the EIVC cycle?

c) Derive an expression for this maximum difference in pumpingwork between the normal cycle and the EIVC cycle in terms of pe,pi*, Vc and Vm. Justify any assumptions you make.

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