Patent ID: 6837223

Claim:
An internal combustion engine purge flow rate controlling apparatus, comprising: a. purging unit for purging evaporative fuel produced within a fuel tank to an induction system of an internal combustion engine; b. target purge flow rate calculator for calculating a target purge flow rate when purging to the induction system is implemented via the purging unit; c. control purge flow rate calculator for calculating a control purge flow rate based on the target purge flow rate so calculated; and d. calculator for calculating a value to be added to or subtracted from the control purge flow rate based on a deviation between the calculated target purge flow rate and a value detected previous to the calculated control purge flow rate, wherein the control purge flow rate calculator calculates the control purge flow rate by adding or subtracting the value so calculated to be added or subtracted to or from the value detected previous to the control purge flow rate.