| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaporation fuel processing device for adsorbing evaporation fuel generated in a fuel tank to a canister, supplying the adsorbed evaporation fuel to an engine to purge it, in which a concentration of the evaporation fuel adsorbed in the canister is calculated on the basis of a value of load of a pump flowing the evaporation fuel from the canister to detect concentration of the evaporation fuel adsorbed in the canister, without providing a new concentration sensor, and simplify a configuration of the evaporation fuel processing device.SOLUTION: This invention comprises: a circulation passage connected to a canister 11 to cause evaporation fuel to flow from the canister 11 in independent from a purge passage 16; a purge pump 13A arranged in the circulation passage to cause evaporation fuel from the canister 11 to flow; and concentration estimating means for detecting a value of operating load of the purge pump 13A and estimating a concentration of the evaporation fuel adsorbed in the canister 11.SELECTED DRAWING: Figure 1 |
