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    AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    1.
    发明公开
    AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 审中-公开
    STEUERUNG DES KRAFTSTOFF-LUFT-VERHÄLTNISSESFÜREINEN VERBRENNUNGSMOTOR

    公开(公告)号：EP2711519A4

    公开(公告)日：2017-09-27

    申请号：EP11865891

    申请日：2011-05-16

    申请人： TOYOTA MOTOR CO LTD

    发明人： FUJIWARA TAKAHIKO ,  KIMURA KOICHI ,  TOMIMATSU MAKOTO ,  SUZUKI JUNICHI

    IPC分类号： F01N3/10 ,  F02D41/02 ,  F02D41/10 ,  F02D41/14 ,  F02D41/18

    CPC分类号： F01N3/10 ,  F01N3/101 ,  F02D41/0295 ,  F02D41/10 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1456 ,  F02D41/18 ,  F02D41/187 ,  F02D2041/1412 ,  F02D2200/501 ,  Y02A50/2324 ,  Y02T10/22

    摘要： An air-fuel ratio control apparatus for an internal combustion engine according to an embodiment of the invention (the present control apparatus) sets a target air-fuel ratio to a target rich air-fuel ratio when it is determined on the basis of the output value Voxs of a downstream air-fuel ratio sensor 67 that the oxygen adsorption amount of a catalyst 43 tends to be excessive, and sets the target air-fuel ratio to a target lean air-fuel ratio when it is determined on the basis of the output value Voxs that the oxygen adsorption amount of the catalyst 43 tends to be insufficient. Further, the present control apparatus determines whether or not an operation state in which a large amount of nitrogen oxide flows into the catalyst 43 is reached on the basis of "whether a predetermined condition is fulfilled", and makes the target rich air-fuel ratio obtained when the predetermined condition is fulfilled less than the target rich air-fuel ratio obtained when the predetermined condition is not fulfilled. As a result, the concentration of a reducing agent inside the catalyst 43 can be increased before a large amount of NOx flows into the catalyst 43. Therefore, when a large amount of NOx flows into the catalyst 43, most of the NOx can be eliminated.

    摘要翻译： 根据本发明实施例（本控制装置）的用于内燃机的空燃比控制装置在基于输出确定的情况下将目标空燃比设定为目标浓空燃比 当基于该值确定催化剂43的氧吸附量趋于过度时，下游空燃比传感器67的值Voxs被设定为目标空燃比，并且将目标空燃比设定为目标稀空燃比 输出值Voxs表明催化剂43的氧吸附量趋于不足。 此外，本控制装置基于“是否满足预定条件”来判定是否达到大量氮氧化物流入催化剂43的操作状态，并且使目标浓空燃比 当所述预定条件满足时，所述预定条件不满足所述预定条件时获得的所述目标浓空燃比。 结果，在大量的NOx流入催化剂43之前，催化剂43内的还原剂的浓度可以增加。因此，当大量的NOx流入催化剂43时，大部分NOx可以被消除 。