Daimler Ag

Cellcentric Gmbh & Co. Kg

Hans-Joerg Heidrich

Sven Schmalzriedt

Pere Antoni Pastor Nigorra

A method for preparing a fuel cell system in a vehicle for starting, for which purpose a starting preparation routine is carried out after the vehicle has been shut down depending on a temperature limit value. In the method, in the event that the fuel cell had not reached its normal operating temperature during the previous operation and a temperature falls below the predetermined temperature limit value, the fuel cell system is operated until it has reached its normal operating temperature and after which the starting preparation routine is subsequently carried out.

Method for start preparation

A method for starting a motor vehicle with a fuel cell system for providing electrical drive power in the vehicle is disclosed. A starting procedure can be started by a remote control unit independently of the presence of the user in the immediate vicinity of the vehicle. The starting procedure only takes place by the remote control unit if a start signal from the remote control unit exists, and if simultaneously a sensed temperature in the vehicle, the fuel cell system and/or the surroundings of the vehicle is below a predetermined temperature threshold value.

Method for starting a vehicle

In a fuel cell system a specific connection and a valve arrangement make it possible for a compressor to supply precompressed air to a fuel cell stack via a waste gas line, said air then leaving the fuel cell stack via a line which is otherwise an air feed line. In this way, a humidifier may be bypassed. This is sensible in particular during a start phase at low ambient temperatures, during which the fuel cell system is intended to warm up without moisture in the fuel cell stack having a negative effect, for instance by freezing. The compressor may be operated both in the start phase or stop phase and during conventional operation by the same mode of operation.

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Ulm, Germany

Hans-Joerg Heidrich