EVAPORATING FUEL PURGE CONTROL DEVICE OF ENGINE

PROBLEM TO BE SOLVED: To purge evaporation generated in a fuel tank to an intake air system as much as possible by setting a target duty value in a 0 value under a condition where an air conditioner is turned off and an engine is put in an idling condition, and increasingly correcting it by a prescribed difference correction value after its condition is not satisfied. SOLUTION: A water temperature reaches a judging water temperature, and when prescribed judging time passes, operation conditions from various sensors are read in by an ECU 27, and operation is performed on a target duty value. Next, under a condition where an air conditioner is turned off and an operation condition is an idling condition, an actual duty value is set in a 0 value. On the other hand, in the case of NO, when it is not put in an excessive rich condition, a difference increasing correction value according to a difference between a target duty value and an actual duty value is calculated on the basis of data from a O2 sensor 16, and the actual duty value is continuously increasily corrected by this difference correction value, and a duty solenoid valve 25a in a pirge line 23 is controlled so as to be opened and closed, and evaporation is purged to an intake air system.