Abstract: A test apparatus (1) is provided for examining sheet-like components (8), in particular membrane electrode assemblies for use in a fuel cell, at least in sections and preferably continuously, for perforations (7), which apparatus includes means (9) for applying a test gas (6) to one side of the sheet-like component, means (2) for emitting electromagnetic radiation (12) in a wavelength region adapted to the test gas (6), which means are arranged on that side (11) of the sheet-like component (8) which is remote from the test gas (6), and means (3, 4, 5) for detecting any electromagnetic radiation (12) which has been absorbed by the test gas (6) in a characteristic wavelength region, and a method for carrying out an examination of this type.

Abstract: A test apparatus (1) is provided for finding and locating defects in a workpiece (5, 6) The apparatus (1) has at least one heat source (2, 7, 13, 14), at least one sensor apparatus (3, 10, 11, 12) for determining the temperature distribution on at least one surface (8) of the workpiece (5,6), and an evaluation apparatus (4) connected to the sensor apparatus (3, 10, 11, 12) in which apparatus the workpiece (5, 6) and the test apparatus (1) are arranged such that they can move relative to one another in a direction (R) parallel to the surface (8) which has been exposed to the heat. The sensor apparatus (3, 10, 11, 12) extends at least along a line which is transverse with respect to the direction (R) of relative movement downstream of the heat source (2, 7, 13, 14) as seen in the direction (R) of relative movement, in order to measure the temperature distribution along at least this line. A test method for finding and locating a defect by means of a test apparatus of this type is also provided.

Abstract: A test apparatus (1) is provided for examining sheet-like components (8), in particular membrane electrode assemblies for use in a fuel cell, at least in sections and preferably continuously, for perforations (7), which apparatus includes means (9) for applying a test gas (6) to one side of the sheet-like component, means (2) for emitting electromagnetic radiation (12) in a wavelength region adapted to the test gas (6), which means are arranged on that side (11) of the sheet-like component (8) which is remote from the test gas (6), and means (3, 4, 5) for detecting any electromagnetic radiation (12) which has been absorbed by the test gas (6) in a characteristic wavelength region, and a method for carrying out an examination of this type.

Abstract: An arrangement for non-destructive detection and localization of short circuits in a membrane electrode arrangements (MEA), that includes the following components: a) a sample holder for holding and positioning an MEA; b) means for making electrical contact with an MEA so that an electrical voltage can be applied to the MEA; c) means for detection of position-resolved data via the thermal radiation from a body, which means can be arranged at a distance, which can be predetermined, from the sample holder and can make electronic contact with means for evaluation of the detected data. In addition a method for non-destructive detection and localization of short circuits in an MEA.

Abstract: Regulation of energy supplied to an electric motor from an energy supply system including a fuel cell and an energy storage buffer such as a battery, improves the dynamic response of the motor by adding current from the energy storage buffer to the current from the fuel cell during acceleration.

Abstract: Regulation of energy supplied to an electric motor from an energy supply system comprising a fuel cell and an energy storage buffer such as a battery, improves the dynamic response of the motor by adding current from the energy storage buffer to the current from the fuel cell during acceleration.

Abstract: An apparatus for generating and distributing electrical power in a vehicle which has at least one electric drive motor connected via a converter to a fuel cell unit, with the fuel cell unit being connected to at least one first, one second and one third voltage network, and with each voltage network having at least one associated electrical load and/or at least one associated energy store. The first voltage network is formed by the fuel cell voltage network and is connected via a first bidirectional DC/DC converter to the second voltage network and the first bidirectional DC/DC converter provides DC isolation between the first voltage network and the second voltage network. The second voltage network is connected via a second bidirectional converter to the third voltage network.

Abstract: An apparatus for generating and distributing electrical power in a vehicle which has at least one electric drive motor connected via a converter to a fuel cell unit, with the fuel cell unit being connected to at least one first, one second and one third voltage network, and with each voltage network having at least one associated electrical load and/or at least one associated energy store. The first voltage network is formed by the fuel cell voltage network and is connected via a first bidirectional DC/DC converter to the second voltage network and the first bidirectional DC/DC converter provides DC isolation between the first voltage network and the second voltage network. The second voltage network is connected via a second bidirectional converter to the third voltage network.