Abstract: The present invention relates to a method for operating a tank unit (1) for storing a gaseous fuel for a vehicle. The invention also relates to a tank unit (1) for storing a gaseous fuel for a vehicle (F), comprising at least one tank vessel (TB1, TB2, ..., TBn) and at least one valve mechanism.

Abstract: The present invention relates to a method for ascertaining the fill level of a tank unit having a plurality of tank vessels (TB), each of which are connected to a gas pipe system (GL) by a respective valve mechanism that can be switched between an open state and a closed state, wherein the method comprises reading a fill level of all tank vessels out of a data memory, said fill level having been ascertained and stored during a preceding operation of a vehicle; switching the valve mechanisms from the closed state to the open state such that gas can flow from the tank vessels into the gas pipe system; ascertaining a mass of gaseous fuel dispensed from the gas pipe system (GL) during a specified time interval (t) during operation; and ascertaining a current fill level of all tank vessels during the specified time interval by subtracting the ascertained dispensed mass of gaseous fuel from the stored fill level.

Abstract: The invention relates to a diagnostic method (100) for a medium pressure region of a hydrogen tank system (200), wherein the diagnostic method (100) comprises: determining (101) a first pressure present in a medium pressure region of the hydrogen tank system (200) by means of a first pressure sensor (205) arranged at the medium pressure region, determining (103) a difference between the first pressure and a reference pressure determined by a second pressure sensor, comparing (105) the difference with a predetermined threshold value, storing (107) a result of the comparison in a memory at least in the event that the difference deviates from the threshold value.

Abstract: The present invention relates to a method for detecting a malfunction of a fuel outlet arrangement (16) in a tank system (11) for a fuel cell system (10), comprising the steps of: performing a startup operation of the fuel cell system (10) and thereby conducting fuel from fuel tanks (12, 13, 14) through a fuel line arrangement (15), determining a refilling value concerning a refilling of fuel via the fuel line arrangement (15) into at least one fuel tank (12, 13, 14) during the startup operation, providing a reference refilling value, performing a comparison between the determined refilling value during the startup operation and the provided reference refilling value, and detecting a malfunction of the fuel outlet arrangement (16) based on the comparison. The invention also relates to a tank system (11) and a computer program product (23) for carrying out the method, as well as a computer-readable storage medium (24) on which such a computer program product (23) is stored.

Abstract: A method for monitoring a gas system comprises determining a fuel mass flow rate requirement of a consumer system (e.g., fuel cell system comprising a fuel cell assembly), closing a first valve device in order to interrupt a gas feed from a tank into a high-pressure pipe system connecting the tank to the consumer system, capturing a pressure curve in the high-pressure pipe system while the first valve device is closed, in particular by means of a pressure sensor, determining a theoretical actual mass flow rate in the high-pressure pipe system on the basis of the captured pressure curve, comparing the theoretical actual mass flow rate in the high-pressure pipe system with the determined fuel mass flow rate requirement of the consumer system, and generating an error signal by means of a control device if the theoretical actual mass flow rate deviates from the fuel mass flow rate requirement by more than a threshold value.

Abstract: The present invention relates to a method for detecting a malfunction of a fuel outlet arrangement (16) in a tank system (11) for a fuel cell system (10), comprising the steps of: determining a transition from increased operation to reduced operation of the tank system (11) with a reduced fuel mass flow from the fuel tanks (12, 13, 14) of the tank system (11), determining a pressure build-up gradient in a fuel line arrangement (15) during the reduced operation after a defined time has elapsed after the determined transition to the reduced operation, providing a target pressure build-up gradient, performing a comparison between the determined pressure build-up gradient during reduced operation and the provided target pressure build-up gradient, and detecting a malfunction of the fuel outlet arrangement (16) based on the comparison.

Abstract: The invention relates to a fuel injection nozzle for use in an internal combustion engine, having a nozzle body (1), in which is formed a pressure chamber (2) fillable with fuel under high pressure and in which a longitudinally displaceable nozzle needle (4) is arranged, wherein the nozzle needle (4) has a sealing face (5) with which it interacts with a conical body seat (7) formed in the nozzle body (1) and thereby opens and closes the connection from the pressure chamber (2) to a blind hole (10). The blind hole (10) forms a cylindrical section (12) directly adjoining the body seat (7) so that an inlet edge (11) is formed at the transition between the body seat (7) and the blind hole (10). In the nozzle body (1) is formed at least one injection opening (14) which opens into the blind hole (10).

Abstract: The invention relates to a fuel injection nozzle for use in an internal combustion engine, having a nozzle body (1), in which is formed a pressure chamber (2) fillable with fuel under high pressure and in which a longitudinally displaceable nozzle needle (4) is arranged, wherein the nozzle needle (4) has a sealing face (5) with which it interacts with a conical body seat (7) formed in the nozzle body (1) and thereby opens and closes the connection from the pressure chamber (2) to a blind hole (10). The blind hole (10) forms a cylindrical section (12) directly adjoining the body seat (7) so that an inlet edge (11) is formed at the transition between the body seat (7) and the blind hole (10). In the nozzle body (1) is formed at least one injection opening (14) which opens into the blind hole (10).