EGR System of Komatsu Engine SAA6D170E-7
Circuit Diagram EGR System
OPERATION OF EGR SYSTEM
1. The engine controller outputs signals in order to open EGR valve (10) most properly in accordance with the engine load, so that both of the clean exhausting gas and low fuel consumption can be achieved.
2. When EGR valve (10) opens, a part of the exhaust gas (EGR gas) flows from exhaust manifold (14) into
EGR cooler (8) through the EGR piping.
3. The exhaust gas cooled by EGR cooler (8) flows through EGR valve (10), merges with the supply air in the mixing connector (19), and flows into the air intake manifold (16).
• VGT (8) is a turbocharger that changes the cross-sectional area of the exhaust passage.
• EGR cooler (10) is a device that cools down the exhaust gas with the coolant.
• KDPF (3) and (4) are devices that purify the exhaust gas with KDOC (catalyst) and KCSF (soot collecting filter) built-in.
• KCCV ventilator (1) is a mechanism that returns the blowby gas to the intake side after removing the oil from it in order to combust it again. It mainly consists of filters.
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