JRP3 beat me to it, but telling each side's wheels to spin in opposite directions isn't hard. If you consider doing this without messing up the alignment as the hard part (since the wheels will be sliding relative to the direction that they're facing, then steer-by-wire is the easy software solution (cybertruck will be having a yoke and progressive turning ratio afterall) that eliminates the issue caused by a direct steering linkage.
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Tesla BEV Competition Developments
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JRP3 beat me to it, but telling each side's wheels to spin in opposite directions isn't hard. If you consider doing this without messing up the alignment as the hard part (since the wheels will be sliding relative to the direction that they're facing, then steer-by-wire is the easy software solution (cybertruck will be having a yoke and progressive turning ratio afterall) that eliminates the issue caused by a direct steering linkage.
Rivian said something about problems with all wheels not being on the same type of surface and when not being level, etc. ie. you may turn, but you might also break stuff or drift to one side instead of turning in place.
Apparently enough of an issue that Rivian hasn't released the feature even though they were able to demonstrate it. (They said they they were lucky and it worked well in their first attempt of recording it.)
Doggydogworld
Active Member
It's a fabrication. VW never had a 100k target for ID in China. Quite the contrary, they said their 2021 ID4 target was 100k worldwide, with 2/3rd in Europe. Subtract token US sales and that leaves 25-30k for China. Which they blew out of water already.
I save Moneyball's (@DKurac) monthly numbers in a file. Also this.
I agree their target was unimpressive, and I've said so many times. But it's not OK to lie about the target to promote a false narrative that VW is falling short. I call out TSLAQ when they pull that crap, and I call out Alex just the same.
Found this on motortrend: Why Rivian’s "Tank Turn" Stationary Spin Feature Is Delayed
It seems that in the places where you might use tank-turn, you'd want to be REALLY sure about traction. Since the non-steerable tank turn is due to breaking traction, doing something like this on a slight slope (off-road is rarely flat) would be dangerous. So yeah, not strictly software solvable if the steering rack imposes hardware limits.
Tank turn is like a sideways burnout for your tires. That's why two track construction equipment only has sideways tread, to allow turning slip.
Continuous track - Wikipedia
Continuous track - Wikipedia
JRP3
Hyperactive Member
Tank turns would be fairly easy to implement on flat ground where every tire has equal traction, but I could see it going haywire pretty easily on rough ground. If it was feasible to do, somebody would have implemented it in an armored car by this point and I haven't heard of anyone doing that.
Back to the original point, it is a good idea for a manufacturer to take a look at everything the opposition are doing. That was Snady Munro's job for years. He tore apart cars on contract, he only went public with his Model 3 tear down because his customer (which he slipped and said was Audi) stiffed him. Even if the competition has nothing new, that's good for a manufacturer to know as well as understand any innovations they come up with. Even when a poor quality manufacturer comes out with a new car, there is always the possibility that they thought of something nobody else thought of.
Back to the original point, it is a good idea for a manufacturer to take a look at everything the opposition are doing. That was Snady Munro's job for years. He tore apart cars on contract, he only went public with his Model 3 tear down because his customer (which he slipped and said was Audi) stiffed him. Even if the competition has nothing new, that's good for a manufacturer to know as well as understand any innovations they come up with. Even when a poor quality manufacturer comes out with a new car, there is always the possibility that they thought of something nobody else thought of.
Yeah, I leaned to the side of brevity rather than enumerate the various permutations; however, neither of those pics are two track construction equipment.Except for chevron tracks and tires
(Some rubber track skid steers do have a more chevron pattern).
JRP3
Hyperactive Member
I haven't heard of a 4 motor EV armored car either. Minimal advantage in an armored car if any, and with an ICE you'd need to have it drive a hydraulic pump powering independent hydraulic motors to be able to reverse wheels independently, which would also severely limit top speed. Even more difficult in a heavy armored vehicle on pavement.
Tanks use an ICE engine with a complex transmission that allows the treads to run in opposite directions. With the track, all the passive wheels move with the powered one, so it's more feasible. Most armored cars have all wheel drive, but it would require something like a tank transmission to make it work.
JRP3
Hyperactive Member
That's the point, tanks aren't armored cars, a tank type transmission does not independently control 4 wheels. An armored car has an ICE going to a transmission connected to a transfer case which splits the output front and rear to differentials. To control the wheels independently would require those differentials to have individual transmissions as well, one for each wheel, or use a hydraulic system as I mentioned. In any case the complexity becomes absurd and not worth the effort. With 4 EV motors the problem is much easier.
My 6x6 uses skid steering, not a true tank turn, because it steers by braking one side but can't reverse each side independently. (Technically it could if I modified the forward/reverse levers to act independently). It's basically two transmissions in a single housing side by side, chains and gears connect all the axles on a side. In a tank or dozer it's the tread that links the drive wheels and idlers.
My 6x6 uses skid steering, not a true tank turn, because it steers by braking one side but can't reverse each side independently. (Technically it could if I modified the forward/reverse levers to act independently). It's basically two transmissions in a single housing side by side, chains and gears connect all the axles on a side. In a tank or dozer it's the tread that links the drive wheels and idlers.
RobStark
Well-Known Member
Chevrolet Silverado EV Production To Start In 'Early 2023'
The upcoming all-electric Chevrolet Silverado EV pickup truck is scheduled for the market launch in 2023, but when exactly?
insideevs.com
JRP3
Hyperactive Member
If this were road legal I'd be interested. 4 motor 4 wheel steering including crab and tank mode
www.yahoo.com
This Sleek New Electric Off-Roader Can Tackle Any Terrain With Zero Emissions
The new 4x4, which starts at $34,950, has a 200-mile range.
RobStark
Well-Known Member
Gauss Guzzler
Safety Score = 42
This seems like the right thread to mention that I recently started an EV company. Check out the specs and features of our debut model, the "CARburetor 2000":
- 900 mile range
- 80% charge in 20 minutes
- 120% charge in 35 minutes
- Tank turns
- Burpies
- Can fly
Impressive! But you're selling yourself short. Solving the panel gap problem is worth more, no?
It's official, BMW and MINI don't know which direction to turn and it's getting harder to understand...and yes, I think they'll be the first to take significant changes due to their lack of an EV plan and their current car line up being decimated in there most profitable countries.
Jalopnik: The Most Confusing Turn Signals In The Auto Industry Are Probably Here To Stay.
jalopnik.com
Jalopnik: The Most Confusing Turn Signals In The Auto Industry Are Probably Here To Stay.
The Most Confusing Turn Signals In The Auto Industry Are Probably Here To Stay
The next Mini Cooper has been spied, and its taillights still look like they're made to screw with you.
jalopnik.com
My word, I need to stop reading articles on the inter-tubes. I can't even imagine how pissed I'd be if this happened to my car and the runaround these owners are getting from GM and dealers.
How does GM expect to write more advanced code to manage batteries?
Since the 2017 Volt! Enjoy!
GM Authority: General Motors Hit With Shift To Park Lawsuit In California.
gmauthority.com
How does GM expect to write more advanced code to manage batteries?
Since the 2017 Volt! Enjoy!
GM Authority: General Motors Hit With Shift To Park Lawsuit In California.
General Motors Hit With Shift To Park Lawsuit In California
The two plaintiffs own a 2019 Chevy Blazer and 2017 Chevy Volt.
gmauthority.com
RobStark
Well-Known Member
GM's First Ultium Battery Gigafactory Appears Almost Completed
The Ultium Cells's first battery gigafactory, under construction in Lordstown, Ohio, appears to be in the final stage of construction.
insideevs.com
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