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Komatsu’s New Emission

Regulations-Compliant Engine

In addition to refining the Tier 4 Interim technologies,

Komatsu developed a new Selective Catalytic Reduction

(SCR) device in-house.

Heavy-Duty Cooled Exhaust Gas Recirculation

(EGR) System

The system recirculates a portion of exhaust gas into the air

intake and lowers combustion temperatures, thereby

reducing NOx emissions.

EGR gas flow has been

decreased for Tier 4 Final

with the addition of SCR

technology. The system

achieves a dynamic

reduction of NOx, while

helping reduce fuel consumption

below Tier 4 Interim levels.

Technologies Applied to the New Engine

Heavy-Duty Aftertreatment System

This new system combines a Komatsu Diesel

Particulate Filter (KDPF) and Selective Catalytic

Reduction (SCR). The SCR NOx reduction

system injects the correct amount of DEF at the

proper rate, transforming NOx into non-toxic

water (H


O) and nitrogen gas (N



Advanced Electronic Control System

The electronic control system performs high-speed

processing of all signals from sensors installed in the

vehicle, providing total control of equipment in all

conditions. Engine condition information is displayed via an

on-board network to the monitor inside the cab, providing

necessary information to the operator. Additionally,

managing the information via KOMTRAX helps customers

keep up with required maintenance.

Komatsu Variable Geometry Turbocharger (KVGT)


The KVGT system features proven Komatsu design hydraulic

technology for variable control of air-flow and supplies

optimal air according to load conditions. It provides better

exhaust temperature management. The Tier 4 final version

has an improved propeller design for increased performance.


DEF mixing tube

Clean exhaust

Ammonia oxidation catalyst

Second selective reduction

catalyst for NOx

First selective reduction catalyst for NOx

Komatsu Variable Geometry Turbocharger (KVGT)

Selective Catalytic Reduction (SCR)

Komatsu Diesel Particulate Filter (KDPF)

Exhaust Gas Recirculation (EGR) cooler

CG image