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Topic: Electric Vehicles - Your Interest level

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FearlessF

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Re: Electric Vehicles - Your Interest level
« Reply #602 on: August 16, 2021, 09:29:11 AM »
DETROIT (AP) — The U.S. government has opened a formal investigation into Tesla’s Autopilot partially automated driving system after a series of collisions with parked emergency vehicles.

The investigation covers 765,000 vehicles, almost everything that Tesla has sold in the U.S. since the start of the 2014 model year. Of the crashes identified by the National Highway Traffic Safety Administration as part of the investigation, 17 people were injured and one was killed.

NHTSA says it has identified 11 crashes since 2018 in which Teslas on Autopilot or Traffic Aware Cruise Control have hit vehicles at scenes where first responders have used flashing lights, flares, an illuminated arrow board or cones warning of hazards. The agency announced the action Monday in a posting on its website.

The investigation covers Tesla’s entire current model lineup, the Models Y, X, S and 3 from the 2014 through 2021 model years.

The National Transportation Safety Board, which also has investigated some of the Tesla crashes, has recommended that NHTSA and Tesla limit Autopilot’s use to areas where it can safely operate. The NTSB also recommended that NHTSA require Tesla to have a better system to make sure drivers are paying attention. NHTSA has not taken action on any of the recommendations. The NTSB has no enforcement powers and can only make recommendations to other federal agencies such as NHTSA.

Autopilot has frequently been misused by Tesla drivers, who have been caught driving drunk or even riding in the back seat while a car rolled down a California highway.


https://apnews.com/article/technology-business-61557d668b646e7ef48c5543d3a1c66c
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utee94

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Re: Electric Vehicles - Your Interest level
« Reply #603 on: August 16, 2021, 09:41:21 AM »
Yeah, the bit that you're missing is that there IS resistance, but it's not in a direction that matters.

Vertical changes in magnetic force have to balance with gravity and the car's suspension, NOT balance with the car's electric motors.


Still thinking about longitudinal oriented static magnets in the pavement-- what if you synced the car's engine and recharging system so the engine is only working during the first half of the car's traverse over it, but then turned off the motors and coasted over the second half?  Then you'd be recharging without expending any energy from the motors at a 50% duty cycle. 

If the magnets were spaced at short enough intervals it's possible the acceleration/coasting wouldn't be very detectable.  Obviously, if it WERE detectable, then it wouldn't be much fun.  It would feel like how my FIL drives, which almost makes me sick to my stomach sometimes... :)

betarhoalphadelta

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Re: Electric Vehicles - Your Interest level
« Reply #604 on: August 16, 2021, 01:00:06 PM »
Still thinking about longitudinal oriented static magnets in the pavement-- what if you synced the car's engine and recharging system so the engine is only working during the first half of the car's traverse over it, but then turned off the motors and coasted over the second half?  Then you'd be recharging without expending any energy from the motors at a 50% duty cycle.

If the magnets were spaced at short enough intervals it's possible the acceleration/coasting wouldn't be very detectable.  Obviously, if it WERE detectable, then it wouldn't be much fun.  It would feel like how my FIL drives, which almost makes me sick to my stomach sometimes... :)
The more that I think about it, I don't think longitudinal can work. 

I feel like you're looking at the alternating magnets like a pull/push situation, where the actual behavior is a "resist the change" function.

Think of the passing a bar magnet through an electric coil example. To think of this similar to a car, assume that we are working in the frame of forward/backward. I.e. you've got the bar magnet on a string and you're going to pull it TOWARDS you through the coil which is mounted in line with you. So it will simulate a vehicle moving forward through the magnetic field. 

When you try to pull the north end of the bar magnet through the coil towards you, the electrical current induced will create an opposite magnetic force to the movement. I.e. it will create a field pushing against the magnet, but because you're pulling the magnet through and it can't stop it, the force will be applied to the coil in the backwards direction, i.e. towards you. So in the car scenario, this would be a force against the direction of travel. 

Now, you've fully pulled through the magnet so the north end has exited the coil and the south end is moving through the coil. So again you're changing the magnetic field. In this case the current in the coil will be reversed, and it will create the opposite magnetic field attempting to stop you from pulling the magnet out. Because you're pulling the magnet and it can't stop you, the force will be applied to the coil in the backwards direction, i.e. towards you, AGAIN. Thus in the car scenario, this would AGAIN be a force against the direction of travel. 

It doesn't matter whether you start with north or start with south, the forces will always be opposite motion of travel. The only reason to either make the magnetization intermittent, or to make it alternate, is to make sure that you're constantly changing the field because you will only generate current when the field is changing.

But in every case, the force is applied opposite the motion of travel when done longitudinally. 

That's how I remember it from all those physics classes, anyway ;-) 

FearlessF

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Re: Electric Vehicles - Your Interest level
« Reply #605 on: August 21, 2021, 09:55:14 PM »
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FearlessF

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Re: Electric Vehicles - Your Interest level
« Reply #606 on: August 25, 2021, 09:29:03 PM »
https://newatlas.com/science/lithium-metal-ev-battery-benchmark-density-stability/

Remarkable density of new lithium battery promises massive range for EVs
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betarhoalphadelta

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Re: Electric Vehicles - Your Interest level
« Reply #607 on: August 26, 2021, 12:31:05 AM »
https://newatlas.com/science/lithium-metal-ev-battery-benchmark-density-stability/

Remarkable density of new lithium battery promises massive range for EVs
Is it scalable and economical outside the lab?

FearlessF

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Re: Electric Vehicles - Your Interest level
« Reply #608 on: August 26, 2021, 08:42:28 AM »
not yet, but hopeful
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Cincydawg

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Re: Electric Vehicles - Your Interest level
« Reply #609 on: August 26, 2021, 09:16:20 AM »
Battery desirables:

High range (high density, volume and weight)  Duh
Recharge time
Stability
Durability

I'd guess one could push one aspect for headlines while the other three suck.

Cincydawg

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Re: Electric Vehicles - Your Interest level
« Reply #610 on: August 30, 2021, 01:17:39 PM »
GM Working on Lithium-Metal Batteries, Could Achieve 600 Miles of Range (motortrend.com)

Interesting, if that comes to pass, and recharge time is not excessive to get that range.


FearlessF

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Re: Electric Vehicles - Your Interest level
« Reply #611 on: August 30, 2021, 01:57:26 PM »
the best reason NOT to buy an electric for a few years

there will obviously be significant improvements
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betarhoalphadelta

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Re: Electric Vehicles - Your Interest level
« Reply #612 on: August 30, 2021, 02:59:24 PM »
the best reason NOT to buy an electric for a few years

there will obviously be significant improvements
Agreed. 

If I was in the market for a new car this year, it'd be hard to decide to pull the trigger on an EV. The number of options are still limited, and many of the manufacturers not named Tesla are still in first-gen designs. 

Luckily I don't expect to be buying a vehicle for ~5 years or so, at which point I expect the EV market will have exploded and matured.

Cincydawg

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Re: Electric Vehicles - Your Interest level
« Reply #613 on: August 30, 2021, 03:23:56 PM »
I'd be interested in a hybrid today if I wanted a "regular car".

Cincydawg

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Re: Electric Vehicles - Your Interest level
« Reply #614 on: September 03, 2021, 12:58:51 PM »

Cincydawg

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Re: Electric Vehicles - Your Interest level
« Reply #615 on: September 19, 2021, 01:41:29 PM »
2023 Cadillac Lyriq Buyer's Guide: Reviews, Specs, Comparisons (motortrend.com)
2023 Cadillac Lyriq Buyer's Guide: Reviews, Specs, Comparisons (motortrend.com)

Performance
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The Lyriq delivers 340 hp and 325 lb-ft of torque to the rear wheels. This is possible thanks to a single electric motor and a 12-module, 100-kWh battery pack. Eventually, Cadillac will introduce an all-wheel-drive version with a second drive motor for the front axle.

Range and Charging
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Cadillac estimates the Lyriq can travel more than 300 miles on a single charge, putting it ahead of the Audi E-Tron (222 miles) and Jaguar I-Pace (234 miles). Tesla, on the other hand, estimates a range of up to 360 miles for the Model X.
With DC fast charging at public stations, drivers can add up to 76 miles of range on the Lyriq in about 10 minutes. At home, the Lyriq can recharge at a rate of around 52 miles per hour using a 240V, 19.2 kW charging module.

How Much Will It Cost?
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Cadillac says the Lyriq's base price is $59,990. Compared to the starting price of rivals, that's a steal. The Audi E-Tron costs around $67,000, while the Jaguar I-Pace will set you back $71,000. The Tesla Model X is even more expensive. Full pricing information for the Lyriq will be revealed at a later date.




 

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