An Electronic Exhaust Throttle Valve is included between the NOx storage catalyst and the H2S catalyst. Exhaust gas is then fed through an EGR cooler and Cooler Flow Control Valve to the intake air system at the turbocharger compressor inlet. Low Pressure Side – Exhaust gas is recirculated from the exhaust system between the DOC+DPF and the NOx storage catalyst. Exhaust gas is then fed into the Intake Manifold after the Throttle Valve. High Pressure Side – Exhaust gas is recirculated from the exhaust system after the Exhaust Manifold and controlled by a High Pressure EGR Valve. To meet the extremely tight Tier2 Bin5 standards for emissions (maximum of 10 milligrams/mile particulate matter and 70 milligrams/mile NOx for diesel vehicles) the new Volkswagen 2.0L CBEA TDI diesel engine uses a complex EGR system in conjunction with a diesel oxidation catalyst + diesel particulate filter (known as the DOC+DPF), a NOx storage catalyst and a H2S (sulfur) catalyst to achieve efficient NOx and particulate matter reduction. Let’s start with a little background on Volkswagen’s new EGR system.
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