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Tesla Cybertruck
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andre_teprom:
I checked out that video, and you're right, it's pretty mind-blowing how innovative the Cybertruck's engineering is. Tesla definitely shook things up in the automotive world. It's like they rewrote the rules. Traditional automakers do seem to be lagging behind in the EV game.
tom66:

--- Quote from: AVGresponding on December 03, 2023, 05:41:45 pm ---
--- Quote from: schmitt trigger on December 03, 2023, 04:41:47 am ---
Drive by wire, for instance, allowing to tailor the steering ratio depending to speed.


--- End quote ---

This has been tried before, and does not work. The reason should be obvious to anyone that's ever driven a vehicle. The closest to variable steering that actually works is the various 4WS systems the Japanese manufacturers used in the 1980s-1990s. Curiously they don't bother any more.

--- End quote ---

It's literally used by Nissan in some of their vehicles.  There's a redundant clutch which activates if power is lost or there is a fault with the system providing a mechanical override, but in normal use the steering is entirely electronic.  Combined with variable resistance on the wheel you could create quite a realistic feel whilst gaining the benefits of truly adaptive steering.  That said, I can't quite get over the idea of having no mechanical linkage, I don't trust the redundant system quite enough.  And ordinary electric power steering is perfectly sufficient IMO, I've never thought that this would improve things, just make them more expensive if anything went wrong!




--- Quote from: langwadt on December 03, 2023, 08:00:10 pm ---hasn't "Pedestrian Detection and Collision Mitigation Systems" with automatic braking not become mandatory yet?, I know it's been proposed so it won't be long

--- End quote ---

Yes, these systems exist, I am pretty sure my car has this system:
https://youtu.be/watch?v=0P7M8PvG0Pc&t=2m37s

However such systems are not infallable, they cannot detect all pedestrians, cyclists etc.  Adding more mass will always mean any accident that does happen is more severe. The focus should be on reducing vehicle size and weight where possible.  Especially on reducing bonnet height, as that strongly defines the severity of an accident:  if you hit a pedestrian with a lower-down car like a Golf, they're much more likely to impact their head on the windscreen, which is less likely to be fatal than with an SUV where head impacts tend to be on bodywork.

Obviously, some people need larger vehicles, such as those with wheelchairs, elderly/infirm people, and those who use their vehicle as part of their profession.  But SUVs (and trucks) are primarily marketed towards people as a vanity purchase*, and the average occupancy of an SUV barely exceeds that of a smaller car. Cybertruck is even worse, though the statistic in the US for pickup trucks is something like only 30% of people use their pickup bed more than once per year, it's crazy.

*Like for instance, the ridiculous SUV ads like these: https://youtu.be/watch?v=0ITLWCfxmLc  ... yeah, the majority of the time, this vehicle is gonna be sitting in traffic, like the rest of us.
NiHaoMike:

--- Quote from: mendip_discovery on December 03, 2023, 05:41:59 pm ---I think the steering by wire is interesting and I suspect part of the reason they are using it is because they have proven it to be safe. I remember issues about cars using electronics for the throttle and the fears that arose from it. So time will tell if its going to be an issue.

--- End quote ---
I'm curious to know what sort of redundancy features that has. I presume there's already a lot of redundancy for the self driving feature, so the only real addition would be redundant sensors for the driver input. There's already at least 2 battery systems (3 if the main one is a pair of 400V sections) so that's solved for power redundancy.
wraper:

--- Quote from: Benta on December 03, 2023, 08:32:25 pm ---
--- Quote from: AVGresponding on December 03, 2023, 05:41:45 pm ---
--- Quote from: schmitt trigger on December 03, 2023, 04:41:47 am ---
Drive by wire, for instance, allowing to tailor the steering ratio depending to speed.


--- End quote ---

This has been tried before, and does not work. The reason should be obvious to anyone that's ever driven a vehicle. The closest to variable steering that actually works is the various 4WS systems the Japanese manufacturers used in the 1980s-1990s. Curiously they don't bother any more.

--- End quote ---

Strange statement and wrong.
My 2005 BMW 330i (E90) had active steering and it worked perfectly, I enjoyed it. The 5-series had it even earlier. It's a standard option not only offered by BMW (I think, didn't check other brands).
https://en.wikipedia.org/wiki/Active_steering

--- End quote ---
Steer by wire is not the same as active steering at all.  Also Cybertuck turns both front and rear wheels. Rear wheels actually turn in different direction depending on speed.
langwadt:

--- Quote from: wraper on December 03, 2023, 09:21:57 pm ---
--- Quote from: Benta on December 03, 2023, 08:32:25 pm ---
--- Quote from: AVGresponding on December 03, 2023, 05:41:45 pm ---
--- Quote from: schmitt trigger on December 03, 2023, 04:41:47 am ---
Drive by wire, for instance, allowing to tailor the steering ratio depending to speed.


--- End quote ---

This has been tried before, and does not work. The reason should be obvious to anyone that's ever driven a vehicle. The closest to variable steering that actually works is the various 4WS systems the Japanese manufacturers used in the 1980s-1990s. Curiously they don't bother any more.

--- End quote ---

Strange statement and wrong.
My 2005 BMW 330i (E90) had active steering and it worked perfectly, I enjoyed it. The 5-series had it even earlier. It's a standard option not only offered by BMW (I think, didn't check other brands).
https://en.wikipedia.org/wiki/Active_steering

--- End quote ---
Steer by wire is not the same as active steering at all.  Also Cybertuck turns both front and rear wheels. Rear wheels actually turn in different direction depending on speed.

--- End quote ---

Honda Prelude had four wheel steering 35 years ago
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