A Semi Truck SCR, or Selective Catalytic Reduction System, is an emissions control system commonly found on semi-trucks and other diesel-powered vehicles. The SCR system works by injecting a urea-based liquid into the exhaust stream of a diesel engine.
This urea then reacts with the nitrogen oxides in the exhaust to form harmless nitrogen and water vapor. This process reduces the amount of harmful gases such as nitrogen oxides (NOx) and carbon monoxide (CO) that are released into the atmosphere from a semi-truck’s exhaust.
The SCR system is made up of three main components: the dosing unit, which pumps urea into the engine; the catalyst, which helps convert NOx and CO; and an aftertreatment control module, which monitors the entire system. The dosing unit is typically located near the exhaust manifold or turbocharger, while the catalyst is usually found in the muffler or tailpipe. The control module can be mounted on either side of the engine or even inside an engine compartment.
In order for an SCR system to work correctly, it must be properly calibrated and maintained. This includes regularly replacing any worn parts or contaminated liquids as well as ensuring that all sensors are working properly. If a sensor fails or becomes blocked with soot or other contaminants, then it may not be able to accurately monitor emissions levels and can cause damage to other components of the SCR system.
The Benefits of an SCR System
The primary benefit of an SCR system is its ability to reduce harmful emissions from diesel-powered vehicles. By cutting down on these pollutants, semi-trucks equipped with this technology help improve air quality and protect public health.
Additionally, some studies have shown that using an SCR system can improve fuel efficiency by up to 5%. This means that not only are drivers doing their part to protect our environment but they also save money at the pump.
Conclusion
What Is a SCR on a Semi Truck? A Semi Truck SCR is an emissions control system commonly found on semi-trucks and other diesel-powered vehicles.
It works by injecting a urea-based liquid into the exhaust stream of a diesel engine which then reacts with nitrogen oxides in order to reduce emissions of pollutants such as NOx and CO. The primary benefit of this technology is its ability to reduce harmful emissions from diesel vehicles while also improving fuel efficiency by up to 5%.
