this post was submitted on 06 Jan 2024
638 points (92.9% liked)
Technology
60086 readers
5148 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Frequent lite braking allows the regenerative brakes to do all or almost all the work, meaning you recover a good chunk of the energy you’re using in city/stop-and-go traffic.
Infrequent braking or hard braking (which requires the service brakes) means less energy recovered, so shorter range.
Braking does not increase range. Regenerative braking reduces the losses involved, it doesn't eliminate them. Your last sentence makes it sounds like not braking enough will lower your range - that isn't the case.
Hmm. So it's a sneaky little argument for EVs for an in-city use? I wonder why no company screamed about it through a loudspeaker. If that's so, it's a killer feature for most drivers
It was one of the main selling points of the Prius (which has regenerative braking). Great gas mileage, especially in city driving.
This is correct. I'm a Prius driver. I get 45-55 mpg on the highway, depending on conditions. If it's just city driving, I get 55-65 mpg. I've had as high as 72 mpg, many years ago driving Uber downtown.
And with a plugin model Prius... you won't use the ICE power unit at all on a typical commute (25 mile battery range on the current models).
Man, don't I know it. The 2023 Prime is out with a 39-44 mile range, which would cover about half my total daily commute, plus my employer has free charging. Someday...
I'd happily trade it all for robust public transportation, though.
Not being a car guy, I missed it all.
Thanks, I'd keep that in mind.
If I’m not mistaken, the much more important element is air resistance. The power-efficiency ratio of electric motors is nearly constant, meaning the energy usage per unit distance is nearly the same at all speeds, but there is more air resistance at high speeds.
You are correct. Electric motors are 100% efficient, so a combination of air resistance at speed as well as more regenerative braking being done during city driving are the reasons for better city driving effective mpg.
Umm what? Have you never heard of the laws of thermodynamics? I mean, the overall thrust of your argument is correct, but that statement is just nonsense.
Oh, and using regenerative brakes will always waste more energy than not using brakes at all and simply moving at a constant speed. Regenerative brakes are only efficient compared to conventional brakes, which waste all of their energy as heat. Braking more in the city driving doesn't improve an EV's efficiency there compared to using that same EV on a highway (aside from the fact that you're driving more slowly overall,) it just improves its relative efficiency compared to ICE vehicles with conventional brakes.
That's the same for a fuel-based cars. Some other users told me about the black magick trickery electric cars do in the city. Guess you'd like to check their replies too.
Gasoline powered engines are very inefficient in terms of getting all of the potential energy out of it's fuel source. They do have a sweet spot, usually somewhere between 2,000 and 3,500 rpm and most companies will tune their vehicles to be at highway speeds while in that sweet spot. The rpm range from idle (ICEs needing to idle at stoplights decrease city MPG) up to that sweet spot is less fuel efficient than rolling around in the sweet spot, so a lot of stop and go driving will see a gas motor running out of it's fuel efficient range quit a bit.
Electric motors have the same efficiency at any rpm and they don't use energy while the car is sitting still.
I saw those after I posted, and I’m a bit surprised. I always thought the reason EVs lose range on highways was closely related to the reason they don’t have gears. I guess I’ll have to revisit it.
Idk if you have an EV, but I imagine the EV owner reading this thread and thinking to themselves 'Holly-molly, my car can even do that?'.
I mean, regenerative breaking isn’t that crazy. An electric motor and generator are literally the same machine, after all.
You can test it out yourself if you have a hobby motor lying around. When you short the two terminals of the motor, it becomes more difficult to rotate the axle by hand.