2007 BMW Hydrogen7

2007 BMW Hydrogen7

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Photos by -Autonet.ca
Joe Duarte
Published: 06 08 2008

BMW’s days of future fast

The age of hydrogen has arrived. Although some people still entertain the idea of hydrogen as the fuel of the future, BMW is fast-forwarding that timeline with its Hydrogen7 sedan that is currently performing on roads the world over.

The Hydrogen7 is a version of the BMW 7 Series, sporting a 6.0-litre V12 fuelled by either hydrogen or premium gasoline. The choice of which to use is in the driver’s hands until the onboard storage of hydrogen runs out, in which case the car switches to gasoline until such a time as refuelling is performed.

BMW chose to go with an internal combustion engine rather than the fuel-cell most others are showcasing because it believes the 100+ year development of the internal combustion engine makes it a proven, durable and flexible powertrain that can be adapted to various applications.

“The finite element is not the powertrain; the finite element is the fuel,” explains Jason Perron, BMW’s CleanEnergy project leader in North America. “BMW works on all technologies, but the attributes of the internal combustion engine – all-weather durability, long-life, low-cost production, the way it works with the dynamics of the vehicle – has brought BMW to the conclusion that the internal combustion engine still has a lot of potential and a very, very long future especially if it is running on a renewable fuel like hydrogen.”

The onboard tank resides between the trunk and rear seat, taking up a fair amount of room in each area. That was one of the reasons BMW chose the 7 Series for its hydrogen program – the space required for additional components would impact on current usage, but not so much as it would be in a 3 Series or even a 5 Series.

Actually, the first vehicle BMW fitted with hydrogen use was a 5 Series, and the current vehicle represents the 6th generation of BMW’s hydrogen-fuelled vehicle.

The vehicle transports 7.8 kg of liquid hydrogen and uses that at an average of 3.6 kg for every 100 km of travel (that’s the equivalent of 13.3 L/100km, so roughly the equivalent of the gasoline economy rating). Just like a gasoline-fed engine, it will go farther in the highway than in the city, on the same amount of hydrogen.

Filling up the tank takes in about eight minutes, due to the cycle of purging the system, cooling the fuel and pressurizing it for storage. The tank has been extensively tested for crash-worthiness (in tests unlike those performed on current vehicles) as well as sabotage through punctures. Accidental leaks are handled through a boil-off panel below the trunk or a pop-off valve on the roof (there’s also one on the underside of the vehicle, in case of a rollover where the vehicle ends up on its roof).

At 256 hp and 288 lb.-ft. of torque, the engine’s outputs are considerably lower than you’d expect from the 6.0 V12 (438 hp@6000 rpm and 444 lb.-ft.@3950 for the current 760iL sedan) but BMW states that it wanted to showcase what was possible, rather than what was perfect.

That’s the same argument used for the limited hydrogen range (around 200 km) – it’s limited not by the efficiency of the engine, but rather by the amount of fuel the car is able to carry. Energy management on future generations will address that and other hurdles (smaller and better-integrated fuel tanks, for example), says BMW.

Still, despite the anaemic power output and increased weight – the Hydrogen7 weighs 2,460 kg whereas the 760iL weighs 2225) – the car still manages to accelerate to 100 km/h in a reported 9.3 seconds and attain a top speed of 230 km/h.

“There are more important issues addressed by this car than top speed, fuel economy and acceleration,” explains Perron. “This car addresses future fuelling constraints in a package with which consumers are familiar. BMW feels that in order for people to be comfortable with the technology, the car has to be as useful as possible in accordance with today’s cars.”

And to that end, it is. You start the Hydrogen at the push of a button (although it does tend to crank a little longer than the current 760iL) and shift it into gear in the same manner, using the current BMW electronic transmission (like a toggle, really).

There is a considerable amount of tippety-tap from under the hood (rather like a diesel, maybe even noisier) but that is virtually eliminated once the engine cover is in place the hood is closed.

The ride and handling is typically BMW 7 Series, and though the acceleration lacks that launch lurch, it is by no means unbearable. The same goes for passing requirements.

So, BMW is proving the future is quite apparently the present (if the present were to have a large distribution network of hydrogen fuelling stations, which it doesn’t), at least for the dozen or so “environmentally-conscious” dignitaries to whom BMW has presented a Hydrogen7.

Summary:

Year/Make/Model
2007 BMW Hydrogen7
Observed fuel economy
13.9 L/100km (gasoline); 3.6 kg/100 km (hydrogen)
Competitors
none yet

Strong Points

Weak Points

  • - uses renewable fuel
  • - makes dreams come true
  • - efficient powertrain
  • - doesn't require special treatment other than fuel distribution
  • - low power outputs
  • - customer misconceptions

Editors Rating:

Fuel consumption
Unremarkable, but that's not what it's about.
Value for price
Not priced but can you put a price on its renewable fuel usage.
Styling
It's a 7 Series, with minimal add-ons that don't really sway the looks.
Comfort
A little bit less than the normal 760iL, but still very spacious.
Performance
Depending on how you gauge performance, it's either a 1 or a 5.
overall
Proof positive that sometimes a vehicle is worth so much more than the sum of its parts.

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