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Hyundai appears to be phasing out their diesel models in favor of HEVs due to tightening EU diesel regulations and the higher cost of meeting them:

...Hyundai says the new hybrid transmission could allow it to stop selling diesel engines in the future. Hyundai is under intense pressure to meet upcoming European Union emissions standards. In order to get its diesel engines to satisfy regulators, it will need to fit them with a urea injection system at a cost of about $1,500 per car.


That extra cost is what led Volkswagen astray. It struggled to meet emissions standards without installing urea injection systems. When it couldn’t, it installed software designed to fool regulators. That decision may cost Volkswagen billions in fines and legal liabilities to consumers who bought non-conforming cars from Volkswagen.


“A modern diesel engine is already $3000 [at factory cost] more expensive than an equivalent petrol engine. Our engineers think it will cost another $1500 to add the Urea injection system. This additional $4500 cost is very similar to the extra cost of our new hybrid system,” Yang says.


The Ioniq with its new hybrid powertrain is already cleaner than a diesel with the latest urea injection system. If the two powertrains cost the same to manufacture, Hyundai will elect to use the hybrid package instead of building more diesel powered cars. It will take about 4 years for the company to redesign its other front wheel drive cars to use the hybrid system used in the Ioniq...
Hyundai debuts new hybrid transmission in Ioniq EV
 

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May as well, and Diesel is mostly used in trucks these days, not exactly Hyundai's forte as they have none on their current lineup.
 

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Going to depend on the ioniq range. I took a loot at the Hybrid platform and it looks like they could possibly fit two more batteries there.
 

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I think diesel is reaching its limits and it also has a pretty bad rap right now. On top of that its lear that hybrids, EVs, and FCVs are coming next so the transition is pretty blatant.
 

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I see diesel as one of the fillers till greener systems can take over and it comes in during good timing. Even when greener systems are at their prime those that bought into diesels should still be in the clear tho
 

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In the clear that they won't be affected by greener vehicles being on the market and those greener vehicles being affordable and making as much financial sense as a diesel does.
 

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I found a picture of the full electric system under the ioniq EV and it takes advantage of every available space for the battery. Would be great if they can somehow fit an engine in with that electric battery.

 

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In the future it might be possible to fit in small motors by the wheels or even to design a wheel that is a motor... lots of space to work with their.
 

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A wheel that is a motor. That sounds like a really cool idea. Seeing on of those in the flesh seems like it would be a revolutionary idea that would really excite people.
 

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Also another thing that can go into that area is a regenerative system which would be quite slick, electric power being put out and generated all from that space.
 
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