wow, thans to this forum. It brought me new knowledge and ideas. Thanks!
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making beats
wow, thans to this forum. It brought me new knowledge and ideas. Thanks!
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making beats
I love hybrid cars. Not only for the efficiency but i like the way it helps us for a greener world!
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making beats
Over the year 2009-2010 our Southern California Section of SAE, we had engineers from Toyota, Mazda, GM and Honda discuss the future of automobiles, and the answer was the same...electric hybrids.
Racing with alternative power plants is a wide open challenge. Test your vehicle at our 2011 UCI Energy Invitational: http://mechanicaldesign101.com...energy-invitational/
Frankly I'm quite surprised that diesel hybrids haven't been seen or heard all that much. Higher efficiency, less complexity, and oodles of torque at low rpm's. A gasoline engine may be tuned to give 30 highway mpg in an average car, but a diesel will do 40-50+ in that same car. Why throw away a 33-66% increase in fuel efficiency for something like a hybrid by sticking to gas?
Can you please explain why they are less complex?Originally posted by Ken_D:
Frankly I'm quite surprised that diesel hybrids haven't been seen or heard all that much. Higher efficiency, less complexity, and oodles of torque at low rpm's. ...
Maybe these are some reasons: Having an electric motor helps a lot with torque at low speeds, so you can have that without a diesel. Diesel powertrains are more expensive than petrol powertrains, hybrids are more expensive than petrol powertrains, so Diesel hybrids are more more expensive and therefore too expensive for the market.
Lack of an ignition/spark system, aside from the glow plugs, basically. Minor, but hey.Originally posted by Thrainer:
Can you please explain why they are less complex?
Maybe these are some reasons: Having an electric motor helps a lot with torque at low speeds, so you can have that without a diesel. Diesel powertrains are more expensive than petrol powertrains, hybrids are more expensive than petrol powertrains, so Diesel hybrids are more more expensive and therefore too expensive for the market.
Yes, the powertrains are somewhat more expensive, but with the money that toyota has dumped into developing the gas engine for the Prius, I'll bet they could've ended up with a diesel engine that'd push the mileage into the stratosphere.
Why use the electric motor to make up for deficiencies with the gas one? Having more torque from the diesel plus the instant-on electric motor would be the best of both worlds, and if you happened to deviate from hyper-mileage driving technique, you wouldn't be 'punished' as much as with a conventional hybrid.
Look at the base price for a prius ($28k here). Would adding a few grand for a diesel option seriously deter any of its customer base? No way.
Besides, it has to start somewhere, if the same exposure, development and sales were put into diesel hybrids as gas hybrids, they'd be a more reasonable option now, you can't disagree there.
The same was said for hybrids/electric cars in general no more than a decade ago, too expensive and impractical to enter the marketplace, but a few years of technological advancement and development, and today it's well within reach of the average car buyer, if they so choose.
I don't see why diesel hybrids can't become a viable, attractive and practical option in the future.
Yeah, but coal is icky and black and makes smelly soot [/SARCASM]. I feel your pain. So many hippies complain about how "dirty" coal is, but when you ask them for quantitative differences in environmental output of coal power plants vs., well, anything else, all you hear about is how "icky" coal is. But of course the only thing worse than coal is nuclear, because it's all, like, radioactive and stuff (OK, last bit of sarcasm, I promise).Originally posted by Superfast Matt McCoy:
As far as the whole “electricity comes from coal” argument: when viewed from well to wheel, electric cars have half the greenhouse gas emissions of hybrids. And if you graph the percent of electricity coming from renewable, there is a clear trend. Also, the batteries are recyclable.
Are the batteries recyclable yet? I know that was the biggest environmental concern with electric was the batteries, haven't heard anything about them being recyclable. Aside from that, if there was a real breakthrough in battery technology it really would be a game-changer. And the beauty of that is that cell phone and laptop producers would be equally interested in that type of jump in battery technology, so there's a lot of brains focusing on that problem.
And as much as I also love the sound of a V8, for day-to-day use an electric car would be nice. Lower maintenance would be nice, and electricity is cheap. Never ran any analysis on what a $/J is for electricity compared to gas or diesel, that would be an interesting figure. Of course then you'd also have to take into account IC engine thermodynamic efficiency, electric motor efficiency, electric motor regeneration, etc. Would probably make a nice Thermo class report. Although electric motor efficiency is already drastically higher than IC engine efficiency can ever be, and not having a transmission frees up another 10-25% loss.
As far as performance, I remember seeing an electric S-10 drag truck on TV, had something like a "modified" 20 hp electric motor and a bunch of cordless drill batteries and ran something like an 11 sec. quarter mile, almost completely silent. And it was just built by a regular guy, too. Helluva sleeper.
Dr. Adam Witthauer
Iowa State University 2002-2013 alum
Mad Scientist, Gonzo Racewerks Unincorporated, Intl.
Frankly speaking,as a engine student,I don't like the idea of electric cars.The reasons are obvious--I don't want to study hard for years and end up good for nothing.But our teacher always told us that ICE cars wouldn't disappear in 30 years.I'm not sure whether this is true or not.But he is an chief consultant in automobile industry of China.And he told us so.Suppose he is right,then what's going on 30 years later when we have run out the petroleum?We have to turn to electric cars anyway as I can imagine.
Therefore,many big car manufactures like Nissan,BMW,Renault and Mercedes Benz are currently developing their own electric cars as a strategy for the future transportation.ICE cars have to be replaced.It's the fact.It's just a matter of time.
However,as for me,I will continue loving and studying ICE cars for the rest of my life.Maybe there'll be less and less ICE cars in the street in the future.But as long as it exists,it needs someone to handle it.
"Scientists may discover physical universe secrets, but engineers are the ones who change the world."
GSpeed, Engine Team
Jilin University