PROCESS AND DEVICE FOR TANK VENTILATION

摘要

PCT No. PCT/DE92/00127 Sec. 371 Date Sep. 22, 1993 Sec. 102(e) Date Sep. 22, 1993 PCT Filed Mar. 21, 1992 PCT Pub. No. WO92/16734 PCT Pub. Date Oct. 1, 1992.A method for alternately carrying out phases with and without tank venting during operation of an internal combustion engine equipped with a tank-venting assembly is characterized in that the ratio of the time spans with and without tank venting is selected to be dependent upon operating data of the engine or of the tank-venting assembly. Preferably, a variable is measured which is a measure for the fuel quantity to be regenerated during tank venting and the above-mentioned ratio is increased in favor of the tank-venting time span with respect to the base ratio when the value of the measured variable exceeds an upper limit (Dp-SMW; FTEA-SWU). This method makes possible that an adsorption filter and a tank-venting valve in the corresponding arrangement can be dimensioned for lesser throughput quantities than previously without the danger being present that fuel vapors escape to the ambient. The tank-venting time span is extended with respect to the base-adaptation time span when a large amount of fuel vapor occurs whereby the smaller adsorption filter still regenerates satisfactorily notwithstanding the reduced cross section of the tank-venting valve.