Egr System Circuit Diagram - Komatsu PC88MR-10 Shop Manual

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10 Structure and function

EGR system circuit diagram

a EGR: Abbreviation for Exhaust Gas Recirculation

1. Air cleaner

2. KDOC muffler

3. Mass air flow and temperature sensor (MAF)

4. Electric actuator (variable flow turbocharger)

5. EGR cooler

6. EGR valve

7. Electric actuator (EGR valve)

8. Ambient pressure sensor

9. Aftercooler

10. Exhaust manifold

11. Air intake manifold

12. Charge (boost) pressure and temperature sensor

13. Engine controller

C: Blower impeller

T: Turbine impeller

(ENG95-A9J0-044-K-00-A)

The engine controller outputs signals so that EGR valve (6) opens properly according to the engine load to

realize both clean exhaust gas and low fuel consumption.

If EGR valve (6) opens, a part of the exhaust gas (EGR gas) flows from exhaust manifold (10) into EGR

cooler (5) through the EGR piping.

The exhaust gas cooled by EGR cooler (5) flows through EGR valve (6), merges with the intake air in the

air intake connector, and flows into intake manifold (11).

(ENG95-A9J0-052-K-00-A)

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