BETTER PARTSThe gas develops more
Ehra-Lessien, 24. November 2017
The emission limits worldwide are sharper, not only in Europe but also in the equally important markets of North America and China. In the year 2025, the CO2 limits will be according to the expectations of VW around the world to 100 grams per kilometre, after which they are tightened. In order to reach these strict limits, it puts VW in a "real biodiversity" in the drives: it is Not the electric drive alone to inform, but also to the Diesel, the petrol engine, the natural gas drive, the use of synthetic fuels, and hybridization. Some ideas for the future introduced us to the wolf Burger.
Storage catalytic Converter, plus a SCR? VW is working on it ...
The Diesel has more NOx-emissions are currently considered to be the CO2 emissions in the focus. For the reduction of nitrogen oxide emissions, VW wants to combine the Adblue System with the NOx storage catalyst. Because they are complementary: While sas Adblue System works only from an exhaust gas temperature of 200 degrees correctly, the storage catalytic Converter to be Optimum at about 90 to 180 degrees. So far, the VW brand still does not have a self-detonator that has both, but it's being worked on. The Oxy is supposed to be coated cat, so that he can also act as a storage catalytic Converter which reduces the technical effort.
A second SCR-Kat?
The Euro 6 emission standard will limit the NOx emissions to 80 milligrams per kilometre, to 2023, the limit values will fall to around 40 milligrams, believes VW. To achieve this value, it wants VW to use a Mix of engine-internal measures and a better exhaust after-treatment. A higher injection pressure and thus an improved combustion could reduce emissions by 20 per cent, in the case of engines with larger turbochargers (such as the 2.0 TDI with 190 PS) might additionally come an electrically powered compressor is used. The exhaust after-treatment could improve with a second SCR catalytic Converter. The would then be installed in the rear in the exhaust system where the gases are so hot. He could take care of the nitrogen oxides, the stages in the case of fast driven Highway for the first (close to the engine) SCR-Kat break.
Miller motor instead of a gasoline engine
Like the Diesel, the petrol engine emissions to be poorer. Newest child and the Pride of the Wolfsburg engineers of the 1.5 TSI evo, the replaced currently the 1.4 TSI in more and more models. Actually, it is a petrol but a Miller engine. In the Miller cycle, the inlet will be closed for valves in the intake stroke early in the compression stroke no longer kept open. In combination with a high compression ratio of 12.5, the efficiency and the fuel consumption increased is reduced. Also the technology package in the new motor, a turbocharger with variable turbine geometry (VTG), as it is already used in the Porsche 911 Turbo, and a cylinder deactivation, which increases the efficiency at low load. In comparison to the 1.4 TSI should not only reduce the real consumption, but also the turbo lag out. The Motor is also without major Changes for use of synthetic fuels, but also for electrification and natural gas.
Seven Bales Of Straw
Speaking of natural gas, The VW group is currently strongly pushed fuel CNG (Compressed Natural Gas) is expected to be much more popular. In a particularly environmentally-friendly natural gas is, if it is generated from renewable sources. So you can make bales out of seven Straw, as they are often harvested fields around, 300 pounds of CNG, which allows, for example, nearly 10,000 kilometers of travel with the new VW Polo TGI (for a consumption of 3.2 kg of CNG per 100 kilometers). A second possibility is the so-called Power-to-Gas approach. This surplus will be used electricity from the grid as it is generated in turbulent times by wind energy. With this, electricity is generated by water-electrolysis hydrogen, which then results in CO2 from the air, CH4 (methane or natural gas).
Hope for the catering
And how natural gas should be more popular? Here, VW hopes on the one hand, on the providers. According to a study by the Federal Ministry of economy, the demand for natural gas for home heating should be reduced in the future. To compensate for this, RWE & Co more CNG gas stations, the hope is that of VW. Secondly, VW wants to reach that CO2 goal the production of fuel values is included. In Switzerland this is already done. There is a Golf with 100 grams of CO2 per kilometre than 80 grams of vehicle, since 20 percent of the Swiss natural gas to be produced from renewable sources. Finally, the VW wants to help the group by making more natural gas models. After the Audi A4 and A5, VW Polo and Seat Ibiza, a natural gas-Arona (1.0 TGI) comes out in 2018 on the market. Also a 1.5 TGI on the Basis of the 1.5 TSI evo is expected for 2018.
Hybridization: From FMA to GTE
Of course, the hybridization plays an important role in the future planning of VW. Just on the market in the 130 HP strong Golf 1.5 TSI Bluemotion "FMA". The abbreviation stands for "free-wheeling / Motor", that is, there is a function for the sail off the burner. For an additional Twelve-Volt Lithium-ion battery is needed to supply the electric consumers like headlights and audio system with power. In addition to the sailing, the Recuperation is, however, possible: the driver quickly from the Gas, is recuperating, because then most of the time a "terrible situation" is present, in a quick braking is desired. The driver, however, slowly the Gas will be sailed. The fuel saving VW with about 0.4 liters per 100 kilometers.
48-Volt on-Board networks are in development
The next hybridization step would be a mild hybrid with 48-Volt battery, a "mHEV" (mild Hybrid Electric Vehicle). Due to the strong battery, here a belt-driven starter generator can be used, which allows for a greater recuperation, and a quick and comfortable restarting of the internal-combustion engine, but also a Boost. VW is working on it. Also still in the prototype stage, what is referred to VW as the "mHEV plus". A possibility of a direct electric drive with a 48-Volt technology for the front axle for a purely electrical Creep, and Parking would be. Another possibility for the use of the 48-Volt technology with the "e-wheel": With an electric drive for the rear axle could break free, for example, a Tiguan that has stuck in Sand or mud. Also with a "HEV", with a normal Hybrid, without recharging, deals VW. Vehicles with more electric drive have the wolf Burger is already in the offer namely, the Plug-in Hybrid Golf GTE and Passat GTE, as well as the battery electric vehicles e-Up and e-Golf. You see: The diversity of species in the case of the actuators is large, and a Royal road is not in sight.(sl)