SCR Technology

At Case IH, we’ve spent years preparing for this shift. You see, we believe it's possible for you to increase performance and productivity while also preserving and improving the global environment.

What is SCR

The Emissions Situation

The Tier 4 Emissions Regulations established by the U.S. Environmental Protection Agency (EPA) and Canadian Environmental Protection Agency (CEPA) are getting tougher. In 1996, the first off-highway diesel emissions standards began with the implementation of Tier 1 regulations. Since then, standards have continued to be raised and will end with Tier 4B/Final in 2014.

The Emissions Dilemma

Designing a Powerful Engine That Meets Stringent Emissions Standards

Emission requirements may be changing, but you're dealing with the same production challenges and demands you always have. That's why you need equipment that will not only meet the stringent emissions standards, but will also deliver the power and performance you expect.
Diesel Engine Facts

Inside the combustion chamber, Particulate Matter (PM) and Nitrogen Oxides (NOx) have conflicting chemical factors. No diesel engine can be designed to meet both PM and NOx emission standards without the use of an exhaust treatment system.
A Trade Off Is Necessary

When the engine is operating most efficiently for power, minimal PM is produced. However the NOx levels are very high. When exhaust gas is re-circulated back into the intake, the NOx production is reduced. However the higher levels of PM are created. In either situation, an exhaust after treatment system is needed to reduce the levels of remaining pollutants.

What Is PM?

Particulate Matter (PM) is composed of minute particles and pollutants, which pose serious health risks for people and animals.
What Is NOx?

Nitrogen Oxides (NOx) contribute to the cause of acid rain and ground level ozone.

Your Options

SCR

(Selective Catalytic Reduction) is a simple system that maximizes engine power and treats exhaust gases with a second fluid to eliminate pollutants.

+More power:Engines are tuned for maximum horsepower, without compromising efficiency for emissions, resulting in better performance.

+Fuel economy:Fine-tuning the combustion process and eliminating exhaust gas recirculation provides substantial improvement in fuel efficiency.

+Reliability/Durability:Greater durability, increased reliability and lengthened service intervals are all achieved by eliminating the recirculation of exhaust gas contaminants back into the engine.

-Additional fluid:Requires the use Diesel Exhaust Fluid (DEF).
EGR

(Exhaust Gas Recirculation) re-circulates exhaust back into the engine and uses a particulate filter to capture pollutants.

+No additional fluid: Does not require Diesel Exhaust Fluid (DEF).

-Larger Engine Cooling Package: Re-circulating 25-30% hot exhaust gas in the engine has a major impact on the cooling system, particularly on large engines under high-duty cycles.

-Hot Exhaust Temperatures: During required particulate filter regeneration, exhaust temps can reach up to 1292°F, which is nearly twice the normal operating exhaust temperature.

-Increased Maintenance Cost: Oil change frequency increases due to higher levels of exhaust gas recirculation.

Benefits of Case IH SCR Technology

Simplicity -There are no emissions components on the engine. All components are located on the exhaust system.
Cooler Exhaust Temperatures -No increase in muffler temperature over Tier 3 exhaust systems.
More Power -Engines are tuned for maximum horsepower, without compromising efficiency for emissions, resulting in better performance.
Fuel Economy -Fine-tuning the combustion process and eliminating exhaust gas recirculation provides substantial improvement in fuel efficiency.
Reliability/Durability -Greater durability, increased reliability and lengthened service intervals are all achieved by eliminating the recirculation of exhaust gas contaminants back into the engine.

10 Reasons Why SCR is the Right Choice

Industry-leading engineers concur that all manufacturers will need to use SCR to meet the even more stringent Tier 4B standards beginning in 2014. While there are other interim solutions, Case IH believes SCR is the most efficient way to meet EPA standards for agricultural applications.

Lower fuel consumption: The efficiency of the combustion process and smaller engine displacement, combined with greater horse power, optimizes fuel consumption.
Outstanding performance: Since SCR is an after-treatment system, the engine is designed to maximize torque and power with faster response in the field.
Longer service interval: The optimized combustion process preserves oil’s physical properties, reducing maintenance activities and related downtime.
High reliability: SCR system allows the engine to reduce heat rejection of many internal engine components, leading to better reliability.
Unbeatable durability: The reduction of PM inside the engine eliminates clogging problems and the need for regeneration often required with EGR.
Compact packaging: SCR systems are more thermodynamically efficient than Tier 3/Stage IIIA engines. This allows for greater horsepower from smaller engines.
Wide fuel compatibility: SCR systems work regardless of fuel quality and are not influenced by the presence of traditional pollutant substances in the fuel. No part of Tier 4 particulate control involves the use of ultra-low sulfur diesel.
User-friendly solution: SCR systems are simple. The only thing you have to do is refill the DEF at regular fuel intervals.
Environmental care: Pollutants produced during the combustion process are converted into harmless N2 and H2O, already present in the environment.
Advanced technology: SCR is recognized by many engine manufacturers as the technology of the future to be compliant with Tier 4 final/Stage IV.

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SCR Technology

What is SCR

The Emissions Situation

The Emissions Dilemma

Designing a Powerful Engine That Meets Stringent Emissions Standards

Diesel Engine Facts

A Trade Off Is Necessary

What Is PM?

What Is NOx? ​

Your Options

SCR

EGR

Benefits of Case IH SCR Technology

10 Reasons Why SCR is the Right Choice​

You Might Also Be Interested In

Engines

Efficient Power

Case IH Blog

What Is NOx?

10 Reasons Why SCR is the Right Choice