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    • 3. 发明授权
    • Air-fuel ratio control device for internal combustion engine
    • 内燃机空燃比控制装置
    • US09212583B2
    • 2015-12-15
    • US14117440
    • 2011-05-16
    • Takahiko FujiwaraKoichi KimuraMakoto TomimatsuJunichi Suzuki
    • Takahiko FujiwaraKoichi KimuraMakoto TomimatsuJunichi Suzuki
    • F01N3/00F01N3/10F02D41/02F02D41/14F02D41/18
    • F01N3/10F01N3/101F02D41/0295F02D41/10F02D41/1441F02D41/1454F02D41/1456F02D41/18F02D41/187F02D2041/1412F02D2200/501Y02A50/2324Y02T10/22
    • 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.
    • 根据本发明的实施例的内燃机的空燃比控制装置(本控制装置)在基于输出确定目标空燃比时,将目标空燃比设定为目标浓空燃比 下游空燃比传感器67的值Voxs,催化剂43的氧吸附量倾向于过大,并且当基于该催化剂43确定目标空燃比时,将目标空燃比设定为目标稀燃比 输出值Vox,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”来确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 当预定条件满足小于当不满足预定条件时获得的目标浓空燃比时获得的。 结果,在大量的NOx流入催化剂43之前,可以增加催化剂43内的还原剂的浓度。因此,当大量的NO x流入催化剂43时,可以消除大部分的NOx 。