Mercedes SLS Electric Drive hooned on a track.

[Thirdgen89GTA]

750hp, 4 motors, complete independent drive for each wheel and crazy torque vectoring for Yaw Control

[YOUTUBE]IElqf-FCMs8&feature[/YOUTUBE]

[WheelMan]

This is very cool IMO


-Travis

[Arct1k]

Wish the price tag was better and they could squeeze in a small Diesel engine to charge the bats but vvv nice v

[BrianG]

Originally Posted by Arct1k

... and they could squeeze in a small Diesel engine to charge the bats ...

Or better yet, a turbine engine for efficiency.

[Thirdgen89GTA]

Originally Posted by BrianG

Or better yet, a turbine engine for efficiency.

Turbine probably wouldn't pass noise/heat emission standards.

[BrianG]

Originally Posted by Thirdgen89GTA

Turbine probably wouldn't pass noise/heat emission standards.

I don't see why not. Muffle the exhaust for the noise issue just like a normal engine. Heat emissions could be an issue, but nothing that some clever engineering couldn't mitigate. Besides, a turbine sized properly for approx 30-50kw output - just large enough to cover average power draw - wouldn't be too bad. After all, we aren't talking about an engine from a Boeing 7x7...

[zeropointbug]

Turbine generator for sure, you can have a 50kW gen for less than 100lbs, and the heat/noise is a NON issue.

[hashemio]

He gets a little too excited at 9:48 lol

[Thirdgen89GTA]

Originally Posted by hashemio

He gets a little too excited at 9:48 lol

Thats okay, he's one of the few car journalists I enjoy listening too.

[mistercrash]

The guy didn't go into a lot of explanation on it but it sound to me like it's more than just regenerative braking, it sounds like it's constantly monitored and adjusted on the fly to help stabilize the car.

[BrianG]

Originally Posted by mistercrash

The guy didn't go into a lot of explanation on it but it sound to me like it's more than just regenerative braking, it sounds like it's constantly monitored and adjusted on the fly to help stabilize the car.

I agree. Regen braking is simply shorting the motor coils in a controlled manner via PWM, while this negative torque scheme sounds more like "reverse power" is being applied for more aggressive action - just a little though, not enough to actually spin the tires backwards.

[Arct1k]

I'd assume that it is using regen braking vs a Holmes hold style approach. They mention drag brake in the video.

Still some interesting tech.

[mistercrash]

Tech dating back to the late 80s early 90s as far as using negative torque to help the car turn. Pierre Couture from Quebec, Canada had a great project going on with Hydro Quebec with a prototype using in wheel, air cooled motors he developed, he and his team also had some tech about batteries and a tiny generator making a crap load of power. The prototype made with a Chrysler Intrepid had 4 in wheel motors, a large battery and a small generator running with a small gas motor. Recognize the Chevy Volt anyone? All was lost , buried, sold or stolen by other companies due in part to poorly managed patents, but mostly because of other business or political BS. Couture said in those times that the whole power steering mechanism of ICE cars would not be needed because the in wheel electric motors could be used to help steer the car.
one motor per wheel, 95 hp per motor with 1200 Nm of torque per motor. With that much torque, the motors could also be used to brake the car. Powerful as huge disk brakes and precise as the most advanced ABS. Regen braking of course. The project and prototype were just awesome.

http://www.youtube.com/watch?v=jHmxJ...utu.be&t=7m09s

Sorry for the French language in the video.

[lincpimp]

Hmm, i love the hybrid vehicle equation:

Burn gas in engine to create rotaional power to rotate a generator to charge a battery to power a motor to create rotational power to move the car.

Or the plug in electric vehicle equation:

Burn coal in power plant to heat water to turn turbine that also rotoates a generator to produce electricty to eventually charge a battery to power a motor to create rotational power to move the car.


Vs regular "boring" gas engine vehicle equation:

Burn gas in engine to create rotaional power to move the car.

Simple is better.

Until we have local nuclear powerplants or individual high outpout solar production a plug in electric is just a joke. They do need to develop the tech, so we do need more plug in electrics. Hybrids are a marketing scheme, for the people who think green is something other than a color. The cost and complexity of a hybrid limits it to being a lease vehicle, and the pollution they create during their cradle to the grave is greater than other options.

[Arct1k]

Disagree Linc - The effective MPG and efficiency is much higher with the generator or even coal burning.