Bayerische Motoren Werke Aktiengesellschaft

Thomas Hagler

Tobias Brunner

Klaus Szoucsek

Gregor Fischer

Markus Amsz

Achim Baier

Sylvain Bastian

Oliver Kircher

Torsten Rech

An operating method is provided for a cryo-compressed tank for supplying cryogenic hydrogen to a consumer of a motor vehicle under supercritical pressure at 13 bar or more. In order to compensate for pressure loss resulting from hydrogen removal, the removed hydrogen that has been heated in a heat exchanger is conveyed to a heat exchanger, provided in the cryo-compressed tank, by way of a tank pressure regulating valve and a branch line, which branches off of a supply line leading to the consumer. After flowing through the heat exchanger, it is introduced into the supply line downstream of the branching off of the branch line. Over a period of time that significantly exceeds the cycle times of a conventional frequency valve, either the removed amount of hydrogen is guided without limitation into the heat exchanger, provided in the cryo-compressed tank, the tank pressure regulating valve being completely open, or no return of the heated hydrogen into the heat exchanger occurs at all. Downstream of the branching off of the branch line, the supply line has a pressure regulating unit, which ensures that irrespective of the changes in the pressure in the supply line caused upstream of the pressure regulating unit by switching the tank pressure regulating valve, a sufficient and continuous supply of hydrogen to the consumer at the pressure required is guaranteed.

Operating method for a cryo-compressed tank

A system for cryogenic storage and delivery of fuel, particularly for supplying an internal-combustion engine driving a motor vehicle, includes at least a cryotank having an inner reservoir for receiving the cryogenic medium, which inner reservoir is held in a heat-insulated manner in an outer reservoir, a coolable cooling shield between the inner reservoir and the outer reservoir of the cryotank, and a heat sink. As a thermal-energy storage device, the heat sink is in heat-transmitting contact with the cooling shield. A filling and removal device has at least one pipe penetrating the outer reservoir and leading into the inner reservoir. At least for the filling with or for the removal of cryogenic medium, the heat sink is in heat-transmitting contact with the pipe for the cryogenic medium, in order to reduce the entry of heat from the environment into the inner reservoir while emitting heat. The inner reservoir has a recess in which at least the heat sink and the pipe for the cryogenic medium are housed such that they are situated essentially within the circumferential contour of the inner reservoir.

System for the fuel storage and fuel delivery of cryogenic fuel

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Munich, Germany

Thomas Hagler