Method for monitoring ion exchanger for fuel cell system of vehicle, involves determining final insulation resistance after expiry of time window, and utilizing resistance as characteristic value for assessment operability of ion exchanger

摘要

The method involves performing an insulation resistance test between a mass of a vehicle and an electric contact of a fuel cell stack (12) over a defined time window using a measurement device (18) at a connection of an ion exchanger (10) in a coolant circuit (16). The ion exchanger is switched over a valve (14) for deionization of a coolant to the coolant circuit. A final insulation resistance is determined after expiry of the time window. The determined insulation resistance is utilized as a characteristic value for assessment of operability of the ion exchanger. An independent claim is also included for a device for monitoring an ion exchanger for a fuel cell system of a vehicle.