Patent ID: 9005352
Filing Date: 2015-04-14
Classification: F02M

Abstract:
1. A trap canister for adsorbing fuel vapor contained in a breakthrough gas discharged from a main adsorbent canister which is connected to a fuel tank, comprising: a case defining adsorption chamber therein and having a first end open to the atmosphere and a second end for introducing the breakthrough as into the adsorption chamber; an adsorbent filled in the adsorption chamber and being capable of adsorbing and desorbing the fuel vapor contained in the breakthrough gas; a bypass path for bypassing the adsorption chamber; a valve configured to block the bypass path and which is configured to open during refueling; and a negative pressure generator configured to generate negative pressure by using gas flow in the bypass path during refueling; wherein the valve comprises a diaphragm valve configured to be opened by pressure of the gas flowing through the bypass path and wherein the negative pressure generator communicates with the diaphragm valve in order to cause the negative pressure to act on the diaphragm valve.