Enovation Controls is Tier 4 Ready

General Information

Tier 4 is the new Emission regulation for non‐road diesel engines set forth by the Environmental Protection Agency. This regulation will reduce the amount of Particulate Matter exhausted by a diesel engine by 95%.  Likewise, Nitrogen oxides, otherwise known as NOx, will be reduced by 90%, and sulfur oxides will be virtually eliminated from the exhaust gasses.

The EPA states that the removal of these harmful gasses from the exhaust of diesel engines will benefit the health of US citizens. New low sulfur fuels lend themselves to using catalytic substrates on the new tier 4 engines. Tier 4 regulations will be implemented in a phased, two step approach due to the vast reduction in harmful gasses compared to the tier 3 standards. It is a large enough change that the EPA did not feel manufacturers could satisfy the requirements at one time.

Interim Tier 4 is the first step in the regulation that reduces Particulate Matter by 90% over Tier 3 Emission standards. Likewise, there is a 50% reduction in NOx over Tier 3. Interim Tier 4 began implementation on small horsepower platforms in 2008. The next step in the Tier 4 regulation is Tier 4 Final. This final regulation implements an 80% reduction in NOx over Interim Tier 4. Depending on engine size, Final Tier 4 will go into affect starting in 2012. Stage IIIB is the European Union Emissions Standard for diesel engines in particular horsepower ranges. This emission regulation is the European Union’s equivalent to the United States EPA Tier 4 Interim standard.

Diesel Particulate Filter

A device often referenced as DPF that is used to filter diesel particulates out of exhaust in diesel engines. When this is becoming clogged due to the engine’s load not passively burning the soot, the engine will send out a message on the SAE J1939 CAN bus using PGN 64892 SPN3697 with an ON, OFF, or BLINK of the icon depending on the state of filter and engine. This usually indicates a regeneration of the engines exhaust is needed to actively heat and burn the soot from the DPF. Refer to engine manufacturer for further detail.

Selective Catalyst Reduction

This is often referenced as SCR. There are 4 major components of this system.

The components are:

  • Diesel Exhaust Fluid (DEF) tank/Catalyst Tank
  • a DEF doser
  • SCR Catalyst
  • an ammonia Catalyst.

This works by injecting a small amount of Diesel Exhaust Fluid (DEF) into the catalyst where it is mixed, and reacts to the NOx found in the exhaust to produce nitrogen gas and water vapor that is released through the exhaust in a safe environmental method.