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Nissan's third generation e-POWER powertrain

170 points · 462 comments · mroche

  1. gcanyon · · focus · HN ↗
    One thing that always puzzled me was how the gas engines in hybrids were so efficient. Technology Connections has a great video explainer: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=KnUFH5GX_fI" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=KnUFH5GX_fI

    tl;dw: constant RPM and a weird stroke geometry where the power stroke is longer than the other strokes to extract more energy from the expanding gasses.

    1. jostmey · · focus · HN ↗
      I&#x27;m surprised there isn&#x27;t more effort to create hybrids in reverse--an electric car with optional gas generator. The gas generator could run at constant speed, never changing RMP, while the battery handles constant changes in acceleration. The idea is not mine. I&#x27;ve heard about it in China
      1. happosai · · focus · HN ↗
        Range extender EVs made a lot more sense a decade a go when batteries were much more expensive, and fast chargers were not yet ubiquitous. Then range extenders were more affordable than EVs and could go to places EVs couldn&#x27;t.

        Now these EREVs are mostly luxury niche of big cars (where extra space taken by two power trains doesn&#x27;t matter) for people who don&#x27;t want to spend 20 minutes at rapid chargers on that yearly long trip they do. Or for people who live in some global warming ignoring backwater[1] that hasn&#x27;t built out rapid charger yet.

        [1] even China has ubiquitous fast charging network now

        1. subscribed · · focus · HN ↗
          We just drove from the UK to Portugal (via ferry). They were in the electric car and anxious about the next charger almost entire time.

          The only thing worse than the staple &quot;all chargers except one broken, wait time 1h+&quot;, was the ghost charging station existing only on the map - they drove there only to see the empty field instead.

          Needless to say we barely made it in time for the ferry (their refueling was about 3 hours total in the UK alone), and sadly won&#x27;t make me getting EV as the main car anytime soon.

          Second, small town car for errands, maybe, but that means having no comfort or equipment I&#x27;d like to have in the &quot;main&quot; car (and half of it is safety).

          Also - note you seem to suggest the mythical ubiquity of the fast chargers is the solution to the range, but they&#x27;re also so expensive to use that any savings from the local driving and charging at home (if someone is lucky enough to own a house with garage or off-street parking) is immediately burned on the first longer trip.

          1. WarmWash · · focus · HN ↗
            There exists a fringe of people who are constantly driving 5+ hours all the time in random directions and places.

            These people stoke a lot of fear about EVs despite being a tiny fraction of the population.

            1. subscribed · · focus · HN ↗
              Bet. Feel free to stroke your strawman, no need to ever engage with the arguments - peak &quot;shallow dismissal&quot; without substance.
              1. WarmWash · · focus · HN ↗
                Why would I engage when we have a gazillion statistics on driving habits and population density, and EVs work great to cover them?

                We have a vocal minority that keeps stoking EV fears because their unique lifestyle can only be met with a 500 mile range that charges in 5 minutes from a charger located at every gas station, and costs $30k brand new.

                The number of people driving ICE cars that would be better off in an EV is massive, and we know this, and these people still keep getting wrapped around the axle of outlier stories.

                [1]<a href="https:&#x2F;&#x2F;www.bts.gov&#x2F;statistical-products&#x2F;surveys&#x2F;national-household-travel-survey-summer-travel-quick-facts" rel="nofollow">https:&#x2F;&#x2F;www.bts.gov&#x2F;statistical-products&#x2F;surveys&#x2F;national-ho...

                [2]<a href="https:&#x2F;&#x2F;www.bts.gov&#x2F;statistical-products&#x2F;surveys&#x2F;national-household-travel-survey-daily-travel-quick-facts" rel="nofollow">https:&#x2F;&#x2F;www.bts.gov&#x2F;statistical-products&#x2F;surveys&#x2F;national-ho...

                1. SoftTalker · · focus · HN ↗
                  I think a big part of this in the US is that the country is just very big, and between cites are very large rural areas. Yes, for a lot of people their daily commute and errands are well covered by an EV. But there is the occasional 400-500 mile trip, it&#x27;s just not that uncommon for many people to do that at least a few times a year. And if they don&#x27;t want to own a second car for long trips, they rule out an EV because charging infrastructure still isn&#x27;t adequate in many areas.

                  You might counter that by saying &quot;rent an ICE car for those trips&quot; and that&#x27;s certainly possible but, renting a car outside of a major airport is such a miserable experience that many people don&#x27;t want to deal with it. It only takes once or twice turning up to find that &quot;we don&#x27;t have the car you reserved&quot; and being offered some unsuitable alternate (or simply no car at all) for people to sour on that idea.

                  1. WarmWash · · focus · HN ↗
                    What&#x27;s wild to me is that people are so committed to not stopping when road tripping that the thought of two 15 minutes stops in a 6.5 hour drive is not worth giving up weekly trips to gas stations for that year.
                    1. SoftTalker · · focus · HN ↗
                      It&#x27;s not the stopping. It&#x27;s finding a fast charging point that doesn&#x27;t require a substantial detour off the route. That has improved, so it&#x27;s less and less a valid reason. But there are still places where you might go a few hours between convenient commercial chargers. Now, does that impact the vast majority of drivers? Probably not, and the situation is improving. But people hear things like that and they decide to stay in their comfort zone.
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