Page 115 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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Engine systems 99

Air supply

Exhaust gases EGR valve

Figure 2.29 Exhaust gas recirculation (EGR)

Exhaust gas in air
charge reduces
oxygen content

Cylinder charge with
exhaust gas

recirculation

Figure 2.30 Reduced oxygen

Figure 2.31 Phases of combustion, diesel engine: A, start of injection; B, start of combustion;
C, controlled phase; D, bottom dead centre; E, top dead centre; F, piston travel; G, combustion
chamber pressure (A – B is the delay phase)