| 摘要 |
PURPOSE:To eliminate degradation of emission performance by starting fuel increment through predetermined means with correspondence to the lagging of EGR response at the start of EGR thereby properly controlling the air/fuel ratio at the start of EGR and preventing from going over-rich. CONSTITUTION:A controller is comprised of fuel control means 1 for feeding fuel corresponding with the operating condition to a fuel injection valve 9 and EGR control means 2 for controlling EGR control valve 12 to perform recirculation of exhaust gas under preset engine operating region. While fuel correction means 3 for providing a fuel increment signal to the fuel control means 1 upon elapse of predetermined time from the time point when the engine operating condition has transferred to said specific operating region is provided. With such arrangement, the fuel increment under EGR is lagged properly while considering the response lag caused through the opening function of EGR control valve 12. Consequently, the air/fuel ratio at the start of EGR is prevented from going to over-rich resulting in elimination of degradation of emission performance. |
