SCR Systems - all you need to know about the SCR System in your Hino Truck

By: Brenden Somerville   |   15 Jun 2015
What is SCR? A diagram
The Environmentally Approved Selective Catalytic Reduction Systems


All of the Hino Trucks available at Somerville Hino are equipped with this environmentally approved SCR System. Hino trucks are the workhorses of today's society, powered by diesel and delivering the vast majority of goods used in North America. Over the years the North American heavy truck industry has been challenged to develop a clean diesel engine solution to meet the Environmental Protection Agency's new standards for 2010. The solution is the Selective Catalytic Reduction (SCR).


What is SCR?

What does SCR have to do with your truck? SCR stands for Selective Catalytic Reduction, this is an active emissions control technology system used in diesel engines. Basically SCR controls the amount of emission given off by your truck, where a liquid-reduction agent is injected through a special catalyst into the exhaust stream of your truck diesel engine.


How SCR works?

The liquid reduction is an automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF), this sets off a chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide, these natural components of the air are then expelled from your truck, hence saving the environment.  


SCR technology can achieve Nitrogen Oxide reductions by up to 90%


Selective Catalytic Reduction - this technology allows nitrogen oxide reduction reactions to take place in an oxidizing atmosphere. This reduction is set in motion by the DEF (the reducing agent), where the DEF reacts with the nitrogen oxide to convert the pollutants into nitrogen, water and tiny amounts of Carbon Dioxide. DEF in turn can be rapidly broken down to produce the oxidizing ammonia in the exhaust stream.  


The reducing agent - DEF

DEF - Diesel Exhaust Fluid is a non-toxic fluid composed of automotive grade aqueous urea and purified water, it is rigorously tested by the American Petroleum Institute to ensure that it meets industry-wide quality standards.


Why is SCR important?

SCR has the ability to deliver excellent fuel efficiency when compared to engines using higher rates of exhaust gas recirculation (EGR) for Nitrogen Oxide control. Nitrogen Oxide emissions are controlled in the exhaust through SCR instead of in the combustion process through EGR, diesel engines can be tuned for optimum fuel efficiency - a critical concern with the high prices for diesel fuel.


The Benefits of SCR

  • SCR -reduces Nitrogen Oxide emissions up to 90% while simultaneously reducing Hydrogen Chloride and Carbon Dioxide emissions by 50-90% and PM emissions by 30-50%
  • When combined with a diesel particulate filter a greater emission reduction for Particulate Matter is achieved.
  • 3-5% Fuel economy gain as reported by SCR-equipped truck operators
  • The SCR system itself requires very little maintenance and no driver action while the truck is operating.


SCR & EPA Standards

New EPA Standards - all heavy duty truck engines produced after Jan 1, 2010 must reduce particulate matter and nitrogen levels to near zero levels.

According to an online study conducted in November 2008, 53% of truck buyers will likely consider the purchase of SCR technology to meet the 2010 EPA standards compared to only 29% that will likely consider increased EGR.




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