Patent ID: 8336527
Filing Date: 2012-12-25
Classification: F02M

Abstract:
1. An evaporated fuel processing device comprising: a fuel tank that can accommodate fuel; a canister carrying out, by an adsorbent, adsorption and purging of evaporated fuel generated within the fuel tank; a first separating unit that separates gas, which contains the evaporated fuel that is introduced from the canister or the fuel tank, into a high concentration component gas whose fuel concentration is relatively high and a low concentration component gas whose fuel concentration is relatively low; a tank return flow path for returning, to an interior of the fuel tank, the high concentration component gas generated at the first separating unit; a communication flow path for exhausting, to an exterior of the first separating unit, the low concentration component gas generated at the first separating unit; a second separating unit that further separates the low concentration component gas, which is introduced from the communication flow path, into another high concentration component gas whose fuel concentration is relatively high and another low concentration component gas whose fuel concentration is relatively low; a purging flow path for sending the other low concentration component gas, that is generated at the second separating unit, to the canister as vapor for purging; an evaporated fuel return flow path that is branched-off from the purging flow path by a branch portion, and that is for returning, to the first separating unit, gas that contains evaporated fuel within the purging flow path; a switching valve that switches a flow path of vapor that is downstream of the branch portion, between the purging flow path and the evaporated fuel return flow path; and a returning pump that pressurizes gas, which flows through the evaporated fuel return flow path, and that sends the gas to the first separating unit.