Patent ID: 6966347
Filing Date: 2005-11-22
Classification: F02M

Abstract:
1. A method for operating a tank leakage diagnosis device in a motor vehicle, for testing a fuel container, which is connected to an internal combustion engine, for tightness, the method comprising: regenerating an adsorption filter from time to time by purging by fresh air drawn in by the internal combustion engine, wherein degassing fuel is temporarily stored with an adsorption filter having at least one of an adsorption capacity and adsorption characteristics, the adsorption filter being connected to the fuel container; providing a loading factor specifying the loading of the adsorption filter with the degassing fuel, wherein the adsorption filter is purged and, in this context, the degassing fuel removed from the adsorption filter over a predefined time span is recorded; calculating, from at least one of the absorption capacity, the absorption characteristics of the adsorption filter, the loading factor, a recorded, removed fuel quantity and a changing at the loading, an exact quantity of the degassing fuel supplied to the adsorption filter from the fuel container over the predefined time span; and performing, as a function of a determined quantity of the degassing fuel supplied to the adsorption filter, at least one of: (i) one of an interrupting and a blocking of at least one tank leakage diagnosis function, and (ii)a correcting of the data as to an actual tank degassing ascertained with the at least one tank leakage diagnosis function.