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Views: 0 Author: Site Editor Publish Time: 2023-10-12 Origin: Site
Diesel oxidation catalyst (DOC): The DOC is a honeycomb-shaped device that helps to convert harmful gases in the exhaust, such as nitrogen oxides (NOx), into less harmful gases. The DOC is typically located in the exhaust system before the DPF.
Diesel particulate filter (DPF): The DPF is a ceramic filter that traps soot particles from the exhaust. The DPF is typically located in the exhaust system after the DOC. The DPF is designed to trap 90% or more of the soot particles in the exhaust.
Temperature sensor: The temperature sensor monitors the temperature of the DPF and helps to control the regeneration process. The temperature sensor is typically located in the DPF.
Regeneration control unit: The regeneration control unit controls the regeneration process, which is the process of burning off the soot particles that have accumulated in the DPF. The regeneration control unit is typically located in the vehicle's computer.
Exhaust gas recirculation (EGR) valve: The EGR valve helps to reduce NOx emissions by recirculating some of the exhaust gas back into the engine. The EGR valve is typically located in the intake manifold.
Selective catalytic reduction (SCR): The SCR system is a technology used to reduce NOx emissions from diesel engines. The main SCR parts are:
SCR catalyst: This is the heart of the SCR system. It is a honeycomb-shaped substrate that is coated with a catalyst that converts NOx into harmless nitrogen and water vapor.
Urea dosing unit: This unit injects urea (DEF) into the exhaust stream. The urea reacts with the NOx in the exhaust to form nitrogen and water vapor.
Temperature sensor: This sensor monitors the temperature of the exhaust and helps to control the injection of urea.
Regeneration control unit: This unit controls the injection of urea and the regeneration process.
