Engines and diesel car can still have their say in this difficult phase energy transition. When will they disappear? Where will the diesel engines go? Diesel engines for the policy they have become the perfect scapegoat against climate change.
But they are not the only ones to blame and, indeed, they can become one perfect ally in the frantic search for zero emissions.
Alternative fuels in TDI diesel engines
Diesel engines Euro 6 of the new generation they have already achieved a low level of emissions, which can be further lowered through the use of synthetic fuels. Volkswagenfor example, has officially approved the use of paraffin fuels for their models equipped with latest generation TDI diesel engines. These newly developed fuels with biological components allow drastic CO2 savings, in the order of 70-95%, compared to conventional diesel.
In addition to the rapid expansion in the area of electric mobility, Volkswagen is continuing to further and systematically develop its traditional range equipped with combustion engines.
All Volkswagen models equipped with 4-cylinder TDI diesel engines delivered from the end of June 2021 are approved for use with paraffinic diesel fuelsaccording to the European standard EN 15940.
Biodiesel on Audi and Volkswagen engines, models
In addition to Volkswagen cars, renewable diesel can also be used on Audi models. In fact, all Audi diesel V6 engines with powers up to 286 HP belonging to the ranges A4, A5, A6, A7, A8, Q7 and Q8 produced from mid-February 2022 can be refueled with HVO fuel. Compatibility for the Audi Q5 3.0 TDI will arrive at the beginning of March and subsequently it will be the turn of the 245 hp step of the Audi A6 allroad quattro.
As for the Volkswagen Brand, the SUV Touareg in the 231 hp configuration it can use sustainable diesel. In Europe, the HVO is also compatible with 4-cylinder diesel engines from Audi A3, Audi Q2 and Audi Q3 produced from June 2021. As for the models based on the MLB platform, i four-cylinder TDI of the A4, A5, A6, A7 and Q5 ranges can be refueled with the HVO from the middle of last year in Sweden, Denmark And Italy.
What are paraffin fuels?
Paraffinic (synthetic) fuels are produced by biological residues or wastesuch as theHVO (hydrotrated vegetable oil): these vegetable oils are converted into hydrocarbons via a reaction with hydrogen and can be added to diesel fuel in any percentage or even replace it altogether. The hydrotreated vegetable oil allows a rreduction of CO2 emissions between 70 and 95% compared to traditional fossil diesel.
Waste materials such ascooking oil used by the food industry oi agricultural residues are an integral part of HVO production. Incorporating the‘hydrogen (hydrogenation), the oils are converted to aliphatic hydrocarbons, suitable for use in Diesel engines. They can be added to conventional Diesel, replacing fossil components, or used 100% pure.
Indeed, HVO is a type fuel BTL (from biomass to liquid). In addition to the BTL system, there are other methods of producing synthetic diesel fuels: for example the GTL (gas to liquid) and the PTL (from energy to liquid). The latter is sustainably obtainable from renewable electricity, water and CO2 from the atmosphere.
Biofuels such as HVO are already available and their share could grow to 20-30% in the European road transport energy market within the next ten years.
To identify the fuels regulated by the legislation EN 15940 the expression is used XTL (X-to-Liquid), with the “X” to indicate the original component. The distributors that supply these fuels are marked with this symbolreplicated by a special one adhesive at the fuel cap of compatible Audi models.
Biofuels in diesel engines
Paraffinic diesel fuels are already offered on the market but those that respect it are already much more popular standard EN590, where biofuel can be added to fossil diesel in limited percentages. This legislation is respected by R33 Blue Diesel which is available at the service stations of the Audi factories in Ingolstadt and Neckarsulm.
This fuel is characterized by one component renewable up to 33% based on residual and waste materials. The R33 has two major advantages: reduces CO2 emissions by 20% compared to fossil diesel and has positive effects on wear and life of components thanks to special additives.
The R33 Blue Diesel meets the most popular standard today, called EN 590, and is therefore compatible with all TDI vehicles, even the most dated. R33 fuel will soon be available in engines as well TSFI gasoline Audi and TSI Volkswagen.
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