Fuel tank ventilation device has additional adsorption filter in ventilation pipe with activated carbon particles and faster regeneration time than main adsorption filter

摘要

The ventilation pipe (11) which communicates with the atmosphere (12) contains an additional adsorption filter (14) which contains activated carbon particles and is designed so that its regeneration time is shorter than that of the main adsorption filter (7). The maximum through-flow cross-sectional area of the additional adsorption filter is smaller than that of the main adsorption filter. The activated carbon particles in the additional filter are smaller than those in the main filter.