| 摘要 |
A trap canister for adsorbing fuel vapor contained in break-through gas discharged from a main canister. The trap canister may include a trap case having an adsorption chamber defined therein and containing an adsorption material, so that the break-through gas flows through the adsorption material in a gas flow direction. The adsorption chamber may include a gas introduction side and a gas outlet side located on a downstream side of the gas introduction side along the gas flow direction. The adsorption chamber may have a passage with a cross-sectional area gradually decreasing from the gas introduction side toward the gas outlet side. The trap canister may further include a temperature control device configured to control the temperature of the adsorption material.
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