| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent emission from being affected badly by completing learning of an air-fuel ratio feedback correction value early with great accuracy in air-fuel control of an internal combustion engine. SOLUTION: In this control device, an engine load (air intake amount GA) is fixed (as time t to t1 and t2 to t4) when air-fuel ratio learning or purge concentration learning is performed based on the movement of an air-fuel ratio feedback correction factor. Therefore, the engine load does not fluctuate and thus air-fuel ratio of the air-fuel mixture is stabilized even when a driver changes a required torque by adjusting an acceleration opening PDLA. Accordingly, learning can be finished rapidly and very accurately. In addition, while the engine load is fixed, an output torque is controlled according to a required torque by adjusting ignition timing. Therefore, the required torque can be obtained even during learning when the engine load is fixed.</p> |
