The emission system on a Semi Truck is an important component in ensuring that the vehicle operates at peak efficiency and reduces air pollution. The system works by capturing and removing pollutants from the exhaust, such as nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter.
A complete emission system includes an exhaust gas recirculation (EGR) system, a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR) system.
Exhaust Gas Recirculation System: The EGR system works by redirecting some of the exhaust gases back into the engine’s intake manifold in order to reduce combustion temperatures and decrease nitrogen oxide emissions. This helps reduce air pollution while also improving fuel economy.
Diesel Oxidation Catalyst: The DOC works by oxidizing the pollutants in the exhaust gas and converting them into harmless compounds like carbon dioxide and water vapor. This helps reduce hydrocarbon emissions.
Diesel Particulate Filter: The DPF captures soot from the exhaust, reducing particulate matter emissions. It is also effective in reducing nitrogen oxide emissions.
Selective Catalytic Reduction System: The SCR system works by injecting an ammonia-based reductant into the exhaust upstream of a catalyst. This converts nitrogen oxides into harmless nitrogen and water vapor, reducing overall emissions.
Conclusion: In conclusion, an emission system on a Semi Truck is essential for reducing air pollution while ensuring that the vehicle operates at peak efficiency. The emission system consists of an EGR system, DOC, DPF, and SCR system which work together to capture pollutants from the exhaust and convert them into harmless compounds.
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