| 摘要 |
PROBLEM TO BE SOLVED: To provide an air/fuel ratio control device for an internal combustion engine which appropriately executes correction of a basic fuel injection quantity even at the time of purge and properly compensates an error in the basic fuel injection quantity. SOLUTION: In the air/fuel ratio control device, a purge fuel quantity Fprg (a value greater than 0 at the time of purge, and 0 at the time of non-purge) is taken into account, and an injection quantity Fbaset in which an injection command should be issued to set an air/fuel ratio to a target air/fuel ratio is acquired in accordance with the formula of Fbaset=(Fi+Fprg)*(abyfs/abyfr)-Fprg (wherein Fi is a command fuel injection quantity, abyfs is detected an air/fuel ratio and abyfr is a target air/fuel ratio). The basic fuel injection quantity correction coefficient KF is acquired on the basis of the Fbaset. The basic fuel injection quantity is corrected by multiplying the basic fuel injection quantity Fbaseb before correction by the KF. Thus, the device can calculate the Fbaset to be an appropriate value in which an injection command should be issued to set the air/fuel ratio to the target air/fuel ratio abyfr and executes an appropriate correction of the basic fuel injection quantity regardless of under purging or non-purging. COPYRIGHT: (C)2008,JPO&INPIT
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