Exhaust pulse pressure charging
Exhaust pulse pressure charging (EPPC) is a system for supercharging two-stroke
diesel engines of the loop-scavenge type. Loop-scavenge engines cannot be pressure-charged in the same way as uniflow engines or four-stroke engines because the inlet and exhaust ports are open at the same time.
The engine usually has a
Roots blowerto provide air for scavenging and this is arranged to deliver excess air so that air follows the exhaust gases into the exhaust manifold. Some of this air is then forced back into the cylinder by a rise in pressure in the exhaust manifold resulting from the exhaust pulse from another cylinder.
For additional pressure charging a
turbochargermay be fitted, in series with the Roots blower, but a turbocharger cannot be used alone because it would not provide enough air for scavenging at low speeds.
Exhaust pulse pressure charging was used by
Crossleyin these diesel locomotiveengines:
* the HST-Vee 8, used in the
British Rail Class 28, the CIE 001 Classand the WAGR X class
* the EST-Vee 8 used in the
CIE 201 Class
* the ESNT 6 used in
British Rail Class D3/3shunting locomotives
* "The Diesel Locomotive" by R. L. Aston, published by Thames and Hudson, London, 1957, pp 19, 22-24, 31
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