Page 18 - Automotive Engineering

Piston-engine cycles of operation CHAPTER 1.1

Fig. 1.1-8 Four-stroke-cycle diesel engine.

the piston’s return stroke will the piston actually catch 1.1.3.1 Historical background to the
up with the tail-end of the outgoing gases. C.I. engine
Fig. 1.1-8(e) illustrates the sequence of the four op-
erating strokes as applied to a four-cylinder engine, and Credit for the origination of the C.I. engine is contro-
the combined operating events expressed in terms of versial, as eminent engineers cannot agree amongst
cylinder pressure and piston displacement are shown in themselves as to which of the patents by Herbert
Figs. 1.1-8(f) and (g). Akroyd-Stuart or Rudolf Diesel contributed most to the

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