BMW Hydrogen 7 is a limited production hydrogen vehicle built by German automobile manufacturer BMW. The car is based on BMW’s traditional gasoline powered 7-series line of vehicles, and more specifically the 760Li. It uses the same 6 litre V-12 motor as does the 760i and 760Li; however, it has been modified to also allow for the combustion of hydrogen as well as gasoline, making it a bivalent engine. Unlike many other current hydrogen powered vehicles like those being produced by Honda, General Motors, and Daimler AG - which use fuel cell technology and hydrogen to produce electricity to power the vehicle - the BMW Hydrogen 7 burns the hydrogen in an internal combustion engine.
BMW Hydrogen 7 uses hydrogen as fuel differently from fuel-cell-type vehicles. When in hydrogen mode, it injects the hydrogen directly into the car’s air intake manifold to be combusted in the engine’s cylinders rather than converting the hydrogen’s energy into electricity to operate electric motors like a fuel cell. BMW says this is a more efficient use of the hydrogen.The car can also switch seamlessly between hydrogen and gasoline at the touch of a button on the steering wheel, and will do so automatically when one of the fuels is depleted.
The hydrogen fuel is stored in a large, nearly 45-gallon (170 liters), bi-layered and highly insulated tank that stores the fuel as liquid rather than as compressed gas, which BMW says offers 75% more energy per volume as a liquid than compressed gas at 700 bars of pressure.The hydrogen tank’s insulation is under high vacuum in order to keep heat transfer to the hydrogen to a bare minimum, and is purportedly equivalent to a 55-foot (17 m) thick wall of polystyrene Styrofoam.
BMW Hydrogen 7is powered by a 6.0 litre V12 engine capable of running on both premium gasoline and hydrogen fuel. It is rated at 191-kilowatt (260 PS; 256 hp) and 390 N·m (290 lb·ft) of torque using either fuel. The car accelerates from stopped to 100 km/h (62 mph) in 9.5 seconds. The hydrogen fuel tank holds roughly 8 kg (18 lb) of hydrogen, enough to travel 125 miles (201 km). The gasoline fuel tank holds 19.5 gallons, enough to travel 300 miles (480 km) for a combined total of over 400 miles (640 km) at cruising speeds. The Hydrogen 7 gets about 5.6 mpg-imp (50 L/100 km; 4.7 mpg-US) on hydrogen (by comparison Honda's FCX Clarity gets 81 mpg-imp (3.5 L/100 km; 67 mpg-US)[9]) and 16.9 mpg-imp (16.7 L/100 km; 14.1 mpg-US) on gasoline. The curb weight of the Hydrogen 7 is roughly 550 pounds (250 kg) heavier than the 760Li, bringing it to about 5,100 pounds (2,300 kg).
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發表於 2012-11-17 16:16:49
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發表於 2012-11-17 16:24:49
用火箭燃料之技術引進到汽車燃料, 欺望有一日可以成樹
