100MPG H3

Apr. 22nd, 2009 01:28 pm
inaki: (Singuarity)
[personal profile] inaki

If you ever wanted to know exactly how a plug-in hybrid works, here's a good clip for it.

Date: 2009-04-22 09:33 pm (UTC)
From: [identity profile] mocha-mephooki.livejournal.com
Its that last stat that worries me... 100mpg is amazingly great, but with an electric range of 40 miles of full battery power... perhaps not so great...

Date: 2009-04-22 09:37 pm (UTC)
From: [identity profile] inaki.livejournal.com
Thats actually normal for plugin hybrids. That means that without touching any gas, you can drive for 40 miles on just the battery. For a full electric that'd be horrible, but for a hybrid that's quite acceptable.

The big advantage on this setup is that the gas motor is litterally just a generator, rather than an engine turning an alternator like in a standard car. This is the problem with the Prius actually. The engine touches the wheels directly, when it shouldn't. Gas motors are most effecient when they can hover right at 2400rpm and not move up or down at all, letting the electrics take the stop and go stresses instead.

Date: 2009-04-22 10:01 pm (UTC)
From: [identity profile] mocha-mephooki.livejournal.com
Ah, I vastly misunderstood, then!

Date: 2009-04-22 11:07 pm (UTC)
From: [identity profile] dphoenixd.livejournal.com
A lot of people commute less than that, too, so for them its effectively an electric car.

inaki: the Prius does work like that- the electric and gas work completely independently. Plus it uses a different type of engine.

The problem there is actually that the electric battery doesn't have enough oopmh in the stock model to power the car for long..

Date: 2009-04-23 02:06 pm (UTC)
From: [identity profile] thraxarious.livejournal.com
I'm waiting to see ultra-capacitor or the new nanowire batteries when they come out.

It still means long recharge times though, at 220V it still will take a long time to charge. Maybe we need 440V recharge stations for electric cars instead?

Date: 2009-04-23 02:34 pm (UTC)
From: [identity profile] tixen.livejournal.com
It should also be noted that they're getting these figures while maintaining FOUR WHEEL DRIVE. O_O

To give you some idea of why this is so incredible- there are two power figures in gasoline engines. "Brake Horsepower" (BHP or HP), and "Horsepower at the wheels" (or WHP).

Brake Horsepower measures the amount of horsepower put out at the crank of the engine, before it goes through the drive train. This figure does not include any of the parasitic loss caused by the transmission or drivetrain- so it's a good number to judge an engine configuration by, but not how powerful the end car is.

Wheel Horsepower measures the amount of horsepower actually being put to the pavement.

Now: In a rear wheel drive configuration, If your engine is 200BHP, you can expect that your rear wheels will produce a figure of roughly 160-180WHP, depending on configuration.

However, in an all or 4 wheel drive configuration, you can expect all wheels to produce only 100-120WHP, because of the parasitic loss caused by running through the drivetrain, and powering all 4 wheels to begin with.

Since they're not going for power, this might not seem like a big deal- but when you lose horsepower, it means you've lost efficiency. This is why Front wheel drive or Rear wheel drive counterparts to current day SUVs always get far superior gas mileage.

...So the fact they've put together a configuration that provides 4WD at 100MPG with a 40 Mile range... is astounding. D:

Date: 2009-04-23 05:38 am (UTC)
From: [identity profile] thraxarious.livejournal.com
though still I don't think this qualifies for the automotive X-Prize. I didn't hear anything about it being won.

Date: 2009-04-23 02:25 pm (UTC)
From: [identity profile] tixen.livejournal.com
This has nothing to do with the automotive X-Prize, as they're not making a sports car. :3


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