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08.04.2010

Komatsu America Tier 4 Diesel Engine Technology

Komatsu Tier 4 Diesel Engine Komatsu Tier 4 Diesel Engine. Photo source Komatsu America Corp.

Komatsu America Corp. introduced its new diesel engine that features the next generation of engine technology designed to meet US EPA non-road Tier 4 interim emission regulations. Based on Komatsu proprietary technologies developed over many years, the new diesel engine reduces exhaust gas particulate matter (PM) by more than 90% and oxides of nitrogen (NOx) by more than 45% when compared to current Tier 3 levels while still consuming less fuel.

Komatsu’s Tier 4 engine technology includes:

• Newly designed variable geometry turbocharger;
• Newly designed DPF (diesel particulate filter);
• Heavy duty HPCR (high-pressure common rail) fuel injection system;
• Larger more robust cooled EGR (exhaust gas recirculation) system;
• Redesigned combustion chamber at top of piston;
• Harmonized engine and machine interface by electronic control system.

Komatsu has integrated this Tier 4 technology into construction and mining engines ranging in size from 3.3- to 46-liter. Komatsu customers have come to expect outstanding quality and performance, and these Tier 4 powered machines are designed to meet customer expectations while improving the environment and fuel consumption.

1. Variable Geometry Turbo System

A newly designed variable geometry turbocharger features Komatsu proprietary technology that varies the air-flow and delivers optimum air quantity to the engine combustion chamber under all speed and load conditions. The result is cleaner exhaust gas and improved fuel economy while maintaining power and performance.

2. Diesel Particulate Filter

Komatsu has designed and developed a high efficiency diesel particulate filter that captures more than 90% of PM. Passive and active regeneration is initiated automatically by the engine controller as needed to burn the particulates while the engine is running allowing uninterrupted machine operation.

3. Heavy Duty HPCR (High-Pressure Common Rail) System

Computer controlled heavy duty HPCR system delivers a precise quantity of pressurized fuel into the engine combustion chamber using multiple injections to achieve complete fuel burn and reduce exhaust emissions.

4. Heavy Duty Cooled EGR (Exhaust Gas Recirculation) System

Cooled EGR, a technology well-proven in existing Komatsu engines, has increased capacity to further reduce NOx to Tier 4 levels. Larger more robust components ensure reliable performance during the demanding work conditions of construction equipment.

5. New Combustion System

The fuel/air combustion chamber located at the top of the engine piston has a new shape designed to improve combustion and further reduce NOx, PM, fuel consumption and noise.

6. Electronic Control System

The engine and machine work equipment function in harmony as the electronic control system performs high-speed processing of information from sensors throughout the machine. The result is reduced fuel consumption, noise, NOx and PM.

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