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    • 26. 发明授权
    • Method of and an apparatus for controlling the air-fuel ratio of an
internal combustion engine
    • 用于控制内燃机的空燃比的方法和装置
    • US5193339A
    • 1993-03-16
    • US784395
    • 1991-12-31
    • Junichi Furuya
    • Junichi Furuya
    • F02D41/14
    • F02D41/1441F02D41/2445F02D41/2454F02D41/1456F02D41/2448F02D41/2477Y02T10/22
    • An air-fuel ratio controlling apparatus carries out air-fuel ratio feedback control with the use of air-fuel ratio sensors disposed on the upsteam and downstream sides of a three-way catalytic converter. An air-fuel ratio feedback correction coefficient calculated based on an output value of the upstream air-fuel ratio sensor is corrected according to a correction quantity obtained based on an output value of the downstream air-fuel ratio sensor. This correction quantity is calculated according to a learned collective correction quantity uniformly applicable for a whole operation region, and learned regional correction quantites applicable for divided operation regions, respectively. When the learned collective correction quantity is corrected through addition, a portion added to the learned collective correction quantity is subtracted from each of the learned regional correction quantities. This subtraction is carried out only on the learned regional correction quantities of the operation regions whose degree of progress of learning is greater than a predetermined value. This arrangement improves the speed and accuracy of the air-fuel ratio learning control carried out according to the downstream air-fuel ratio sensor, and promotes the learning of an operation region in which learning opportunity is small.
    • PCT No.PCT / JP91 / 00650 Sec。 371日期1991年12月31日 102(e)1991年12月31日PCT日期1991年5月16日PCT。空燃比控制装置利用设置在上游侧和下游侧的空燃比传感器进行空燃比反馈控制 三元催化转化器。 根据上游空燃比传感器的输出值计算的空燃比反馈校正系数根据下游空燃比传感器的输出值得到的校正量进行校正。 该校正量根据对于整个操作区域均匀适用的学习集体校正量,以及分别适用于分割操作区域的学习区域校正量来计算。 当通过加法校正学习的集体校正量时,从学习的区域校正量的每一个中减去添加到所学习的集体校正量的部分。 该减法仅在学习进度大于预定值的操作区域的学习区域校正量上进行。 由此,能够提高根据下游空燃比传感器进行的空燃比学习控制的速度和精度,促进学习机会小的操作区域的学习。