Method for operation of a fuel cell system in a vehicle

摘要

A method of operating a fuel cell system in a vehicle that is switchable to a temporary stop mode and restarted from the stop mode. When, in certain driving situations, it is required to switch to the stop mode, it is then checked whether the operating conditions of the fuel cell system allow a switch to the stop mode. If the switch is allowed it takes place. When a restart of the fuel cell system is required on the basis of the vehicle the settings of the stop mode are cancelled again. The switch to the stop mode involves, with further existing electric contacting of the fuel cell, the air mass flow conveyed by the air conveying device being switched off or reduced to a predefined value and the pressure of the combustion gas supplied being reduced to a predefined value.

主权项

1. A method for operating a fuel cell system in a vehicle, the method comprising:
switching the fuel cell system to a temporary stop mode; and restarting the fuel cell from the temporary stop mode, wherein the fuel cell system comprises at least one fuel cell supplied on a cathode side via an air conveying device with an air mass flow and on an anode side via a device for combustion gas supply with a combustion gas mass flow, wherein on the basis of the vehicle in certain driving situations a requirement for a switch to the stop mode arises, wherein it is determined whether current operating conditions of the fuel cell system allow a switch to the stop mode, wherein if the switch to the stop mode is allowed said switch takes place, and wherein the settings of the stop mode are cancelled again if a restart of the fuel cell system is required, wherein operation in the stop mode involves, with continued electric contacting of the fuel cell, drawing current from the fuel cell, the air mass flow conveyed by the air conveying device being stopped or reduced to a predefined value and a pressure of the combustion gas supplied being reduced to a predefined value without interrupting the combustion gas supply, and wherein upon switching to the stop mode a flow connection is opened between the air mass flow to the fuel cell after the air conveying device and an exhaust gas flow from the fuel cell system.