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    • 8. 发明公开
    • INTERNAL COMBUSTION ENGINE
    • 内燃机
    • EP3075992A1
    • 2016-10-05
    • EP16162772.4
    • 2016-03-30
    • TOYOTA JIDOSHA KABUSHIKI KAISHA
    • OKUBO, TakuyaNAKAGAWA, NorihisaKIMURA, Koichi
    • F02D41/02F02D41/14F02B37/00F02D13/02F02D41/00
    • F02D13/0261F02B25/145F02B37/00F02D41/0007F02D41/0295F02D41/1441F02D41/1454F02D41/1456F02D41/26F02D2041/001F02D2200/0814Y02T10/144Y02T10/18
    • An internal combustion engine (100) comprises a supercharger (101), variable valve timing mechanisms (B and C), a catalyst (20), an upstream side air-fuel ratio sensor (40), a downstream side air-fuel ratio sensor (41), and an air-fuel ratio control device. The air-fuel ratio control device sets a target air-fuel ratio of the inflowing exhaust gas based on the air-fuel ratio detected by the downstream side air-fuel ratio sensor and controls the amount of fuel fed to the combustion chamber (5) by feedback control so that the air-fuel ratio detected by the upstream side air-fuel ratio sensor matches the target air-fuel ratio when a blow-through amount of air blown from the intake passage through a cylinder to the exhaust passage due to an occurrence of valve overlap is a reference blow-through amount or less. The air-fuel ratio control device sets the target air-fuel ratio of the inflowing exhaust gas based on the air-fuel ratio detected by the downstream side air-fuel ratio sensor and, without performing the feedback control, feeds the amount of fuel calculated from the target air-fuel ratio to the combustion chamber when the blow-through amount is greater than the reference blow-through amount. The air-fuel ratio control device updates the target air-fuel ratio of the inflowing exhaust gas based on the oxygen storage amount of the catalyst, the oxygen storage amount of the catalyst being calculated based on the air-fuel ratio detected by the upstream side air-fuel ratio sensor when the blow-through amount is the reference blow-through amount or less, and being calculated based on the target air-fuel ratio of the inflowing exhaust gas when the blow-through amount is greater than the reference blow-through amount.
    • 内燃机(100)具有增压器(101),可变气门正时机构(B,C),催化剂(20),上游侧空燃比传感器(40),下游侧空燃比传感器 (41)和空燃比控制装置。 空燃比控制装置基于由下游侧空燃比传感器检测到的空燃比来设定流入排气的目标空燃比并且控制供给到燃烧室(5)的燃料量, 通过反馈控制,使得当从进气通路经由气缸吹到排气通路的空气的吹过量由于上游侧空燃比传感器检测到的空燃比与由目标空燃比检测到的空燃比 气门重叠的发生是参考吹气量或更少。 空燃比控制装置基于由下游侧空燃比传感器检测到的空燃比来设定流入排气的目标空燃比,并且不执行反馈控制而供给计算出的燃料量 当通过量大于参考通过量时,从目标空燃比到燃烧室。 空燃比控制装置基于催化剂的氧气储存量更新流入的排气的目标空燃比,催化剂的氧气储存量基于在上游侧检测到的空燃比计算 在所述通过量为所述基准通过量以下的情况下,当所述通过量大于所述基准通气量时,基于所述流入的排气的目标空燃比计算空燃比, 通过量。
    • 9. 发明公开
    • AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    • STEUERUNG DES KRAFTSTOFF-LUFT-VERHÄLTNISSESFÜREINEN VERBRENNUNGSMOTOR
    • EP2711519A1
    • 2014-03-26
    • EP11865891.3
    • 2011-05-16
    • TOYOTA JIDOSHA KABUSHIKI KAISHA
    • FUJIWARA, TakahikoKIMURA, KoichiTOMIMATSU, MakotoSUZUKI, Junichi
    • F01N3/22F01N3/36
    • 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 下游侧空燃比传感器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NOx流入催化剂43时,可以消除大部分的NOx 。