| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the emission by rapidly determining with excellent accuracy whether the learning value is converged. <P>SOLUTION: The deviation DVoxslow between the output value Voxs and the downstream side target value Voxsref of a downstream side air-fuel ratio sensor disposed downstream of a catalyst multiplied by the proportional gain Kp is calculated as the proportional term Kp.DVoxslow (1035). The time integration value SDVoxslow is calculated by integrating the deviation DVoxslow multiplied by the prescribed adjustment gain K (1030), and the value proportional to the time integration value SDVoxslow is calculated as the integration term Ki.SDVoxslow (1035). The integration term Ki.SDVoxslow is acquired as the sub FB learning value KSFBg (1055). The proportional gain Kp is set to a smaller value after it is determined that the sub FB learning value KSFBg is converged, and the adjustment gain K is set to a smaller value after it is determined that the sub FB learning value KSFBg is converged (1025). <P>COPYRIGHT: (C)2012,JPO&INPIT |
