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Steam Hybrid Car from BMW
RMX writes "BMW is unveiling its turbosteamer hybrid engine, which uses the excess heat in the exhaust system and reclaims 80% of it by powering a steam engine that assists the gas engine. Overall, this gives a 15% more efficient engine; and significant additional performance (power and torque) with practically no downside. "This project resolves the apparent contradiction between consumption and emission reductions on one hand, and performance and agility on the other," commented Professor Burkhard Göschel. Are steam engines the future of environmental-friendly hybrid vehicles?"
...with practically no downside.
Additional moving parts, and servicability? How many modern garages know how to service a steam engine?
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Although the idea seems nice on the surface, how much more energy goes into refining the metal for the additional engine? How much weight is added? How much cost is added? Although many of these schemes seem beneficial, when evaluated over the lifespan of the product it may be a net zero or net loss from the existing technology. If people would stop buying new cars every two years, we would be better off than everyone buying the newest, latest greatest enviro-trendmobile constantly.
Combined cycle power plants aren't exactly revolutionary. They're more efficient, but more expensive to buy and maintain.
Here are a few downsides off hand:
* More parts == higher maintenance (pumps, special catalytic convertor, etc)
*at least 24 ft of piping that may be impacted by even minor collisions
*Steam systems extra sensitive to corrosion from impurities in coolant.
"God fights on the side with the best artillery." - Napoleon, Marshal of France - speaking truth to power
How many modern garages know how to service a steam engine?
I would think that BMW dealerships would be able to service BMW autos, no? Yes, I understand the rush to FP, but do you think maybe they'll have this covered by the time they go into production?
I am glad to see some innovation to the standard IC engine.
But I guess it's just easier to sit in your armchair and criticize real engineering...
A house divided against itself cannot stand.
The trouble is when people buy new cars that are NOT environmentally friendly, those cars also continue to guzzle for as long as they're on the road. If the average vehicle coming off the assembly line were more efficient, then we'd be pushing out the older crap with newer, better stuff. But the average fuel economy of ALL manufactured vehicles has actually DROPPED since the 1990s: from Automobile and Light Truck Fuel Economy
There's a much simpler and more effective solution... Go full electric drive hybrid. Decouple the engine from the drive.
So you want to go from:
gasoline->motion->electricty->motion
instead of
gasoline->motion
I can't really imagine that's any more (and probbably less with all those energy form transformations) efficient than the current hybrids. Engine efficiency comes from small engines running at constant speeds. That's already accomplished with the hybrids.
AccountKiller
Of course at this point this is just a concept system, it remains to see if it ever makes it into production.
My hope would be to see the steam engine addition connect to an electrical hybrid system, and that the main power source be a low-rev/high torque diesel engine. Do that with dynamic braking, etc. and you might just get an automobile engine that is say, 70% as efficient as the big diesel locomotive engines have been for what, 30 years?
...Open Source isn't the only answer -- but it's almost always a better value than the alternatives...
"The only thing hydrogen is good for is to reduce emissions from the vehicles themselves, but you only end up pushing the pollution to power generating stations, which we'll need a lot more of if the 'hydrogen economy' takes off."
And which are signifcantly more efficient than masses of cars spewing less refined emissions, especially nuclear plants.
Essentially your post says "punish auto owners, and reward mass transit users" while completely ignoring the fact that mass transit is impractical in many places and always will be.
How pathetic are you that you follow me from topic to topic and waste all your mod points at once modding me down?
The power curve put out by an internal combustion engine isn't linear; it prefers to stay at a particular range of RPMs for maximum efficiency. This is why cars have transmisisons to change gears, trying to keep the engine at that preferred RPM range no matter what RPM the wheels are turning at.
Electical motors, on the other hand, are linear: turn up the juice, and the thing turns faster.
The philosophy of using a diesel with electric drive is to keep the diesel engine turning at exactly the right RPMs to maximize efficiency, supplying power to the electrical drive as needed. This way, the locomotive gets the same efficiency moving slowly as it does at speed (as opposed to cars, which would really rather be in 5th gear going 80 km/h).
>To complex? Compared to what? This is a BMW not some american car. Germans may suck as human beings >but they know how to make cars. Cars that actually just bloody work instead of needing to be fixed >every ten miles.
I beg to differ. Do you own a recent vintage BMW? I'm talking about electrical gremilins that will make you pull your hair out. Don't even get me started on VW - disintegrating interior trim, broken window regulators, failing inginition packs. . . etc. etc. Even Mercedes is having a hard time with reliability issues these days.
Germans do make cars that are a hoot to drive, but they sure as hell aren't as reliable as you think.
Well you're assuming we'd keep the design of the gasoline engine similar. If we start using the idea of electricity as a virtual transmission then it's possible to make gains.
Consider a redesign of the combustion engine that has just cylinders that use 2 a modified 2 stroke compression cycle on each end, and just move the cylinder in a tube that has an electric coil. Put a magnet in the middle and you can transmit power without needing to connect the cylinder to any mechanical transfer system. It'll produce a pretty standard AC sine-wave, and because there's no direct mechanical coupling it can run at optimal efficiency or power rates instead of having to deal with constant acceleration/deceleration. You could even shut down and power up individual cylinders on demand, and since there's no mechanical connections, using say, dozens or hundreds of smaller cylinders for better efficiency and more flexible power would be possible.
On the electric side, motors have far better low end torque, and less moving parts overall. If you did the design right you might even be able to eliminate the mechanical transmission for different gears completely. Not having mechanical transfer means you can easily do things like 1 motor per wheel directly coupled. This would again provide more robust redundancy, better efficiency, scalability (only run 2 motors when needed i.e. highway driving), better driving properties (full time all-wheel drive), etc.
Granted you're still going gas->motion->electricity->motion, but you're not replacing just gas->motion. You're replacing gas->several thousand moving parts with friction losses and failure rates->motion with gas->electricity->maybe a couple dozen parts->motion. The removal of the complex mechanical transfer system is where you'll get the efficiency AND reliability boost. But that would make cars last for 20 years, and nobody wants that, right?
Introducing the new Occam Fusion! Now with sqrt(-1) fewer blades!