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Old 02-26-2010, 07:32 AM   #1
AVANTI R5
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Default Lotus Evora 414E Hybrid Concept





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What would you get if you blended the delicious Lotus Evora sports car with the upcoming Chevrolet Volt? This Evora 414E hybrid concept, which makes its debut at the Geneva auto show. A plug-in electric car with a range-extending gasoline engine, just like the Volt, the slinky Evora 414E hybrid is one of the most compelling incarnations of an electric car we’ve yet seen.

The Evora 414E hybrid is powered by two electric motors—one at each rear wheel, which allows for torque vectoring between the wheels. The motors, capable of generating a combined 408 hp (or 414 PS, for Pferdestärke, a largely German unit of power measurement—hence the car’s name) and 590 lb-ft of torque, get their juice from a 17-kWh lithium-polymer battery pack located in the center of the vehicle for optimal weight distribution. A Lotus-developed 1.2-liter three-cylinder gasoline engine that produces 47 hp kicks in once the battery is depleted to generate power to recharge the batteries and extend the vehicle’s range from about 35 miles to over 300 miles. Like that other electric sports car, the Tesla Roadster—which, of course, is based on Lotus Elise hardware—the Evora hybrid is said to hit 60 mph in under four seconds.

Mind Games
Interestingly, while the electric-based powertrain requires only a single-speed transmission, the Evora 414E hybrid has a “simulated paddle-shift gearbox offering ultra-quick gearchanges reminiscent of a dual-clutch transmission.” The seven-speed gearshift simulation is not just active during acceleration, as it also mimics downshifting while braking, so as to continue the illusion that you’re driving a conventional sports car. In doing so, the electric motor can be spun up more aggressively to facilitate regenerative braking action without it seeming out of place.

There’s more: Lotus and Harman International have developed the “HALOsonic suite of noise solutions” to generate—get this—engine sounds inside the vehicle through the audio system. And it also produces similar noises outside the vehicle through front- and rear-mounted speakers, so as to provide a warning to pedestrians that may not have noticed the flashy sports car barreling towards them. There are no fewer than four driver-selectable engine sounds from which to choose, two of which have been designed to mimic engines—a V-6 and, yes, a V-12—a third that makes a “futuristic” sound, and a fourth that combines the two types of sounds.

All together, Lotus claims that the Evora 414E hybrid “provides less of a psychological step for people familiar with high-performance cars compared to other electric and hybrid sports cars.”

Copper Color Scheme
Lotus says it rendered the interior and exterior of the show car in a satiny copper due to the color’s association with electrical systems. A “floating roof” continues the theme with funky circuitry graphics and a backlight that offers a clear view of both the electric and internal-combustion power systems below.

While the car is technically still a concept, Kevin Smith, Lotus’s PR chief for the U.S., says the company wouldn’t be spending its time developing most of this stuff if it didn’t have production intentions for the technologies. The sound simulations, for example, have been under development “for a long time,” according to Smith. Still, he says that it’s too early to announce actual production plans. But we’ve got a feeling the show circuit—pardon the pun—won’t be the only place you’ll see this car.
http://www.caranddriver.com/news/car...ept-auto_shows
















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Old 02-26-2010, 09:41 AM   #2
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I think that's pretty badass, I don't think I quite understand the simulated transmission. If it's only a single gear, how would it simulate a dsg? Did they actually put a multi geared transmission in the car? I also think the fake engine sounds are a little stupid but overall this thing sounds pretty damn cool.
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Old 02-26-2010, 09:51 AM   #3
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Get rid of the stupid audio simulations and the stupid simulated gear changes. If its an electric car, make it one.. Stop trying to hide the fact that its a damn EV. Be proud of what it is...All that extra crap adds weight...

If somebody is dumb enough to buy an EV hybrid, then they KNOW its an electric hybrid, why add tech to try to convince them it is not.
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Old 02-26-2010, 10:01 AM   #4
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Agreed. I view the parallel hybrid more favorably than a pure EV because engine noises and all that other good stuff are still there. Even if it is from a smaller engine.
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Old 02-26-2010, 10:48 AM   #5
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I am surprised it took this long to think up a sports car with this type of hybrid system. I tought this would be an interesting idea for a super car, but not for environmental reasons but for pure performance (since electric motors have some advantages over ICE). The fake engine sounds and fake transmission feel are stupid ideas (but if I had a choice of sounds I would make my car sound like a Tie-fighter). Like Scrappydo said be proud of what you made.
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Old 02-26-2010, 11:18 AM   #6
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I wonder if the "futuristic" sound is like the cars in The Jetsons?
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Old 02-26-2010, 11:20 AM   #7
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The shape of the Evora body is just pure sex. I don't care if it just came with the 1.2L 47hp engine, I'd get one!
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Old 02-26-2010, 11:48 AM   #8
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It seems slightly strange to me
17kWh pack
1.2L 50 hp engine

Karma
? kWh
2L ?HP

Volt
16 kWh
1.4L 71 HP engine

It really doesn't make sense from a design point of view. The small battery pack keeps weight down, but means that the electric range is small. It also means the batteries are getting hammered to provide the acceleration they list. That means short battery lifetime. The small engine means performance is gone when in range extended mode. This is important b/c if the engine was better matched to the electric motors then you could still have performance after you drain the batteries to the design limit.

If you want a small battery pack you need a bigger range extender. That only makes sense if you want any kind of consistency. It doesn't seem this was thought out that well at all. It might do well at a one time event drag strip style, but it will have worse performance after than a lowly volt let alone the sports car type of competition it will face.
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Old 02-26-2010, 11:52 AM   #9
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Old 02-26-2010, 01:53 PM   #10
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Quote:
Originally Posted by sxotty View Post
It seems slightly strange to me
17kWh pack
1.2L 50 hp engine

Karma
? kWh
2L ?HP

Volt
16 kWh
1.4L 71 HP engine

It really doesn't make sense from a design point of view. The small battery pack keeps weight down, but means that the electric range is small. It also means the batteries are getting hammered to provide the acceleration they list. That means short battery lifetime. The small engine means performance is gone when in range extended mode. This is important b/c if the engine was better matched to the electric motors then you could still have performance after you drain the batteries to the design limit.

If you want a small battery pack you need a bigger range extender. That only makes sense if you want any kind of consistency. It doesn't seem this was thought out that well at all. It might do well at a one time event drag strip style, but it will have worse performance after than a lowly volt let alone the sports car type of competition it will face.

I'm not smart on batteries, but couldn't they fix the short bursts of acceleration with some capacitors?
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Old 02-26-2010, 02:34 PM   #11
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Quote:
Originally Posted by Tim-H View Post
I'm not smart on batteries, but couldn't they fix the short bursts of acceleration with some capacitors?
Yes. But I don't think capacitors are practical. But my knowledge is limited on the subject.
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Old 02-26-2010, 02:48 PM   #12
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Ultracapacitors are quite expensive. They also are not energy dense (read big and heavy), but I personally believe that they have a place definitely for buffering just as you both suggested. Argonne NL is working on the algorithms for this and NREL just published a study about using them for the mild hybrids that GM made awhile ago (the BAS).

For a car like this the expense should not be a problem. So Tim I will agree that you could definitely fix the battery life issue by using them, but you would need a launch button effectively. (That is if you want to use the ultracaps effectively the rest of the time).

Everything depends on cost in the end, but my pet theory is that they will make mixed battery packs at some point instead of ultra caps + battery. What I mean is throw in some super high cycle life, high power batteries, and some lower cycle life high energy batteries. The former are expensive like ultracaps but they are still way more energy dense than an ultra cap. The later are cheaper and have once again way more energy per volume and mass.

Of course it might come down to a mix of all 3, just like your computer has a hard drive, ram, and cache.

So in summary yes ultracaps make sense for a vehicle like they list for short bursts of acceleration (in terms of saving the battery from premature destruction), but it still leaves the other questions unanswered. I would prefer they oversize the range extender in a sports car not undersize it. If done right you could have a pretty decent track performer, good efficiency, and all electric around town.
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