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VW commercial vehicles: T6.1 with two SCR catalysts
The T6.1 also receives two-stage NOx cleaning, which is intended to reduce emissions, especially when starting from cold, and raise the van to Euro 6d. AdBlue tank doubled to 27 liters, consumption drops by 0.5 l / 100 km.
Made clean: with the new model year and starting in the Multivan, the T6.1 has been given a thoroughly revised exhaust gas cleaning system with twin dosing processes. | Photo: VWN
Made clean: with the new model year and starting in the Multivan, the T6.1 has been given a thoroughly revised exhaust gas cleaning system with twin dosing processes. | Photo: VWN
11.12.2020 Daniela Kohnen
(published on LOGISTRA by Johannes Reichel)
Volkswagen Commercial Vehicles has also announced an extensive exhaust gas cleaning update for the T6.1 series. With the new model year and starting in the TDI Multivan with 110 kW output, a newly designed exhaust gas purification system positioned close to the engine in combination with double AdBlue injection will be used. This will be followed by the Transporter, Caravelle and California, whose nitrogen oxide emissions should also be reduced by more than 50 percent lower NOx emissions in the realistic and stricter RDE cycle. In addition, the manufacturer wants to have achieved a lower fuel consumption of an average of 0.5 liters per 100 kilometers by redesigning the exhaust gas turbocharger.
From January 1st, the new emissions standard with the abbreviation EU6d-ISC-FCM, or EU 6 AP, will come into force across the EU for passenger cars and light commercial vehicles. In the case of the T6.1 series with its various derivatives, which have a gross vehicle weight of up to 5.3 tonnes in the vehicle with a full payload plus maximum trailer load, the technical requirements to meet the legal requirements are particularly demanding, the provider outlines. In order to avoid effects on drivability and to meet the strict standards, extensive technical changes to the units of the EA288Nutz engine series were necessary.
The transporter variant will also follow. The performance levels remain identical except for the top TDI, the AdBlue tank grows to 27 liters. | Photo: VWN
More for less: two SCR catalysts ensure NOx reduction
The central issue was the relocation of the exhaust gas cleaning system from the underbody close to the engine in order to use the waste heat there to enable the nitrogen oxide cleaning system to start much faster. In addition, there is a new injection system, new exhaust gas turbochargers, a three-phase exhaust gas recirculation system and the DeNox 5.3 system, used for the first time in the group, for reducing NOx. A second SCR catalytic converter is located in the underbody. In this way, depending on the mode of operation of the vehicle, at least one of the catalysts should always work in the optimal temperature range. The manufacturer promises that the greatest possible efficiency would be achieved even under high loads such as when towing a trailer or driving fast on the motorway. The further development of the exhaust gas recirculation systems from low-pressure and high-pressure elements also aims to achieve the best possible raw emissions. This means that for the first time in a commercial vehicle, the close-coupled exhaust gas cleaning previously only known from passenger cars is used.
Doubled AdBlue tank for more range
Another innovation is that the AdBlue tank volume has almost been doubled to 27 liters. Since the AdBlue consumption remains at the same level thanks to the more precise metering despite better nitrogen oxide conversion and double injection, it is now possible to drive significantly longer than before without refilling. The BiTurbo unit also uses a new injection system with a pressure of 2,500 bar, which increases the maximum engine output from 146 kW to 150 kW. In all other stages of the 2.0-liter TDI engine, the engine output remains unchanged at 66, 81 and 110 kW.
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