METHOD AND DEVICE FOR DIAGNOSING A LEAK IN A TANK DURING INCREASED GAS EMISSION FROM FUEL

摘要

The invention relates to a method for operating a device (40) for diagnosing a leak in a motor vehicle tank, according to which volatile fuel is temporarily stored using an adsorption filter (26), which is regenerated at intervals by being purged (102) with fresh air (34). To eliminate incorrect measurements in the diagnosis of tank leaks, the adsorption filter is purged (102) and the volatile fuel that is evacuated from the adsorption filter over a predetermined period is integrated, said integration being used to determine the loading, which varies during the time period, of the adsorption filter with the volatile fuel. The quantity of gas emitting fuel that is supplied during the time period from the fuel container to the adsorption filter is calculated from the absorption capacity or characteristics of the adsorption filter, from the integrated fuel quantity and from the varying loading. The operation of the tank leak diagnosis device (40) is influenced (116), based on the calculated quantity of fuel supplied to the adsorption filter (26).