Our Tier 4 Final (T4F) Innovations

Many innovative strategies were used to make diesel engines T4F-compliant. Fewer exhaust emissions are only one benefit; T4F systems also can produce power more efficiently, so the engine's displacement can be reduced, maximizing efficiency without sacrificing power output. Some of the most significant T4F compliance strategies used in the diesel engines that power Miller® engine-driven welders are shown and explained here.

1. Cooled Exhaust Gas Recirculation (CEGR) System

The pollutant NOx is formed when oxygen and nitrogen in the air react at high temperatures, like those found in an engine's cylinders. The CEGR system captures a small amount of the engine's exhaust, cools it to a lower temperature and diverts it back into the engine's cylinders. This makes fewer oxygen and nitrogen molecules available to chemically create NOx. An electronically controlled switching valve optimizes the CEGR system's operation, ensuring maximum engine performance at all times. This optimized performance has the added benefit of higher power density, which increases both engine torque and fuel efficiency.

Benefits:
Fewer NOx emissions, improved engine power, greater fuel efficiency.

2. High-Pressure Common Rail (HPCR) Fuel Injection System

This advanced design applies extreme pressure (up to 34,000 psi) to diesel fuel, storing the pressurized fuel in a "common rail" — one that's shared by all of the engine's fuel injectors. When this pressurized fuel exits an injector, it vaporizes into an extremely fine mist that burns more completely.

Benefits:
Optimizes engine performance with fewer emissions, greater fuel efficiency and lower fuel consumption.

3. Diesel Oxidation Catalyst (DOC)

The DOC is similar to a catalytic converter found in gasoline-powered automobiles. As diesel engine exhaust passes through the DOC, it reacts with the catalytic material inside. The chemical reaction transforms much of the exhaust into harmless water vapor and carbon.

Benefits:
Fewer exhaust emissions; requires no maintenance.

4. Electronic Engine Controls

These controls precisely regulate the timing and delivery of fuel and adjust the air/fuel ratio to maintain optimal performance under all conditions, including environmental variables such as temperature and altitude.

Benefits:
Maximizes engine power; minimizes fuel consumption and emissions. Optimizes engine performance throughout a broad range of temperatures and altitudes, giving you more operational flexibility.