BMW

BMW

Bayerische Motoren Werke AG is a German automobile, motorcycle and engine manufacturing company founded in 1916. It also owns and produces the Mini marque, and is the parent company of Rolls-Royce Motor Cars. BMW produces motorcycles under BMW Motorrad and Husqvarna brands...

 CleanEnergy vehicles have both a hydrogen

Hydrogen vehicle

A hydrogen vehicle is a vehicle that uses hydrogen as its onboard fuel for motive power. Hydrogen vehicles include hydrogen fueled space rockets, as well as automobiles and other transportation vehicles...

 and a petrol tank. If one of the tanks is empty, the bivalent

Bivalent (engine)

A bivalent engine is one that can use two fuel types. Examples are petroleum/CNG or petroleum/LPG which are widely offered in the European passenger vehicle aftermarket...

 BMW engine

Engine

An engine or motor is a machine designed to convert energy into useful mechanical motion. Heat engines, including internal combustion engines and external combustion engines burn a fuel to create heat which is then used to create motion...

 unit switches over automatically to the other fuel system. One decisive advantage of the combustion engine is bivalence. It enables both hydrogen and petrol to be used, thus creating the ideal conditions for a transition from non-regenerative to regenerative drive energies. During electrolysis

Electrolysis

In chemistry and manufacturing, electrolysis is a method of using a direct electric current to drive an otherwise non-spontaneous chemical reaction...

 water is split into its components of hydrogen and oxygen. The hydrogen is stored and the oxygen is needed in the vehicle for the combustion of the hydrogen. The combustion process generates energy and water as a waste product, which returns to the natural water cycle. And so with the aid of regenerative energy suppliers, a theoretically emission-free fuel is obtained.

See also

• Flexible-fuel vehicle
  Flexible-fuel vehicle
  A flexible-fuel vehicle or dual-fuel vehicle is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, usually gasoline blended with either ethanol or methanol fuel, and both fuels are stored in the same common tank...
  
  
• Hybrid car
• bivalent (engine)
  Bivalent (engine)
  A bivalent engine is one that can use two fuel types. Examples are petroleum/CNG or petroleum/LPG which are widely offered in the European passenger vehicle aftermarket...