| 摘要 |
PROBLEM TO BE SOLVED: To quickly and appropriately learn fuel concentration of purge gas all the time with respect to an evaporated fuel processing device for processing evaporated fuel generated in a fuel tank. SOLUTION: The device calculates a feedback correction factor FAF for feedbacking an exhaust air-fuel ratio to a fuel injection amount. On the basis of the deviation from a reference value 1 generated in the amplitude center FAFSM of the FAF, a concentration updating basic value TFAF is set (Step 134, 136). A vapor concentration correction factor FGPG expressing the fuel concentration of purge gas is renewed on the basis of the concentration updating basic value TFAF (Step 142). In a period when abrupt drop in fuel concentration of purge gas is predicted with the progress of purge (Step 132), the concentration updating basic value TFAF is made bigger than usual by a predetermined valueδso as to accelerate updating speed (Step 136). COPYRIGHT: (C)2007,JPO&INPIT
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