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    • 2. 发明授权
    • Air-fuel ratio control system of internal combustion engine
    • 内燃机空燃比控制系统
    • US07474956B2
    • 2009-01-06
    • US11885266
    • 2006-09-13
    • Norihisa NakagawaTakahiko FujiwaraTaiga HagimotoJunichi KakoNaoto KatoShuntaro Okazaki
    • Norihisa NakagawaTakahiko FujiwaraTaiga HagimotoJunichi KakoNaoto KatoShuntaro Okazaki
    • G06F19/00F02D41/14F01N3/10
    • F02D41/1441F01N2560/025F01N2560/14F02D41/123F02D41/1454F02D41/1456F02D2041/1409F02D2041/1422F02D2200/0814
    • An air-fuel ratio control system maintaining constant an oxygen storage amount or oxygen release amount per unit time with respect to an exhaust purification catalyst having an oxygen storage capacity even if the intake air amount changes is provided.An air-fuel ratio control system of an internal combustion engine having an intake air amount detecting means, a linear air-fuel ratio sensor arranged at an upstream side of an exhaust purification catalyst, an O2 sensor arranged at a downstream side of said exhaust purification catalyst, a target air-fuel ratio controlling means for performing feedback control of a target air-fuel ratio of exhaust flowing into the exhaust purification catalyst based on output information from the intake air amount detecting means and the O2 sensor, and a fuel injection amount controlling means for performing feedback control of the fuel injection amount based on output information of the linear air-fuel ratio sensor so as to achieve the target air-fuel ratio, characterized in that the target air-fuel ratio controlling means performs feedback control of the target air-fuel ratio so that even when the intake air amount changes, a correction amount per unit time of an oxygen storage amount of the exhaust purification catalyst is made constant.
    • 即使提供进气量变化,也能够提供相对于具有储氧能力的排气净化催化剂,每单位时间保持恒定氧气储存量或氧释放量的空燃比控制系统。 一种内燃机的空燃比控制系统,具有进气量检测装置,布置在排气净化催化剂的上游侧的线性空燃比传感器,配置在排气净化装置的下游侧的O2传感器 催化剂,目标空燃比控制装置,用于根据来自进气量检测装置和O2传感器的输出信息,对流入排气净化催化剂的排气的目标空燃比进行反馈控制;燃料喷射量 控制装置,用于基于线性空燃比传感器的输出信息进行燃料喷射量的反馈控制,以实现目标空燃比,其特征在于,所述目标空燃比控制装置执行所述目标空燃比控制装置的反馈控制, 目标空燃比,使得即使当进气量变化时,排气的氧气存储量的每单位时间的校正量 净化催化剂保持恒定。
    • 5. 发明授权
    • Exhaust gas purification device for an internal combustion engine
    • 内燃机用废气净化装置
    • US06263667B1
    • 2001-07-24
    • US09664449
    • 2000-09-18
    • Hiroshi SawadaJunichi Kako
    • Hiroshi SawadaJunichi Kako
    • F01N300
    • F02D41/0275B01D53/9409B01D53/9495F01N3/0842F01N11/007F01N13/009F01N13/011F01N2430/06F01N2550/02F01N2550/03F01N2900/0422F02D2200/0816Y02T10/47
    • In an exhaust gas purification device for an internal combustion engine, a NOX occluding and reducing catalyst is disposed in the exhaust gas passage of an engine. The NOX occluding and reducing catalyst absorbs NOX in the exhaust gas when the air-fuel ratio of the exhaust gas is at a lean air-fuel ratio and releases and reduces NOX when the air-fuel ratio of the exhaust gas is at a rich air-fuel ratio. The air-fuel ratio of the exhaust gas flowing out from the catalyst is detected by an air-fuel ratio sensor disposed in the exhaust gas passage downstream of the catalyst. When the air-fuel ratio of the exhaust gas flowing into the catalyst is changed from a rich air-fuel ratio to a lean air-fuel ratio, the air-fuel ratio of the exhaust gas flowing out from the catalyst stays at a stoichiometric air-fuel ratio before it changes to a lean air-fuel ratio. The length of the period in which the air-fuel ratio of the exhaust gas flowing out from the catalyst stays at a stoichiometric air-fuel ratio corresponds to the magnitude of the ability of the NOX occluding and reducing catalyst as a reducing catalyst. Thus, by measuring the length of the stoichiometric air-fuel ratio period of the exhaust gas flowing out from the NOX occluding and reducing catalyst, the ability of the NOX occluding and reducing catalyst as a reducing catalyst can be precisely evaluated.
    • 在内燃机的废气净化装置中,在发动机的排气通路内配置有NO x吸留还原催化剂。 当废气的空燃比处于稀空燃比时,NO x吸留和还原催化剂吸收废气中的NO x,并且当排气的空燃比处于浓空气时,NOx还原和还原NO x - 燃料比。 从催化剂流出的废气的空燃比由设置在催化剂下游的废气通道中的空燃比传感器来检测。 当流入催化剂的废气的空燃比从浓空燃比变为稀空燃比时,从催化剂流出的废气的空燃比保持在化学计量空气 - 燃料比变化到稀薄的空燃比。 从催化剂流出的废气的空燃比保持在理论空燃比的时段的长度对应于作为还原催化剂的NO x吸藏和还原催化剂的能力的大小。 因此,通过测定从NO X吸留还原催化剂流出的废气的理论空燃比期间的长度,可以精确地评价作为还原催化剂的NO X吸留还原催化剂的能力。
    • 8. 发明授权
    • Exhaust gas purifying apparatus for internal combustion engine
    • 内燃机用废气净化装置
    • US08051641B2
    • 2011-11-08
    • US11991740
    • 2006-10-13
    • Junichi KakoShinichi SoejimaRyozo Kayama
    • Junichi KakoShinichi SoejimaRyozo Kayama
    • F01N3/00
    • B01D53/9495F01N11/002F01N11/005F01N2560/06F02D41/0235F02D41/1446F02D2200/0804Y02T10/47
    • The present invention has an object to provide an exhaust gas purifying apparatus for an internal combustion engine capable of obtaining accurate temperature information relating to a catalyst placed in an exhaust passage of the internal combustion engine. The degree of influence emthc of a catalyst inlet gas temperature and catalyst rear end temperature ethuf[end] is calculated (Step 102). An estimated value ethco of an outlet gas temperature is calculated by weighted averaging the inlet gas temperature and the catalyst rear end temperature ethuf[end] considering the degree of influence emthc (Step 104). A temperature correction coefficient ekthuf[x] for each region of the catalyst is calculated as a function f(emthc) of the degree of influence emthc (Step 108). A deviation between the outlet gas temperature estimated value ethco and a measured value of the outlet gas temperature is multiplied by the temperature correction coefficient ekthuf[x] to calculate an estimated value correction amount ecthuf[x] (Step 110). The estimated value correction amount ecthuf[x] is added to a catalyst temperature estimated value (Step 114).
    • 本发明的目的是提供一种内燃机的排气净化装置,其能够获得与内燃机的排气通道中的催化剂有关的精确的温度信息。 计算催化剂入口气体温度和催化剂后端温度流速的影响程度(结束)(步骤102)。 考虑到影响程度(步骤104),对入口气体温度和催化剂后端温度等级进行加权平均,计算出口气体温度的估计值。 计算催化剂的每个区域的温度校正系数ekthuf [x]作为影响程度的函数f(emthc)(步骤108)。 出口气体温度估计值ethco与出口气体温度的测量值之间的偏差乘以温度校正系数ekthuf [x],以计算估计值校正量ecthuf [x](步骤110)。 将估计值校正量ecthuf [x]加到催化剂温度估计值(步骤114)。
    • 10. 发明申请
    • Exhaust Gas Purifying Apparatus for Internal Combustion Engine
    • 内燃机废气净化装置
    • US20100047133A1
    • 2010-02-25
    • US11991740
    • 2006-10-13
    • Junichi KakoShinichi SoejimaRyozo Kayama
    • Junichi KakoShinichi SoejimaRyozo Kayama
    • B01D53/94F01N3/20F02D45/00
    • B01D53/9495F01N11/002F01N11/005F01N2560/06F02D41/0235F02D41/1446F02D2200/0804Y02T10/47
    • The present invention has an object to provide an exhaust gas purifying apparatus for an internal combustion engine capable of obtaining accurate temperature information relating to a catalyst placed in an exhaust passage of the internal combustion engine. The degree of influence emthc of a catalyst inlet gas temperature and catalyst rear end temperature ethuf[end] is calculated (Step 102). An estimated value ethco of an outlet gas temperature is calculated by weighted averaging the inlet gas temperature and the catalyst rear end temperature ethuf[end] considering the degree of influence emthc (Step 104). A temperature correction coefficient ekthuf[x] for each region of the catalyst is calculated as a function f(emthc) of the degree of influence emthc (Step 108). A deviation between the outlet gas temperature estimated value ethco and a measured value of the outlet gas temperature is multiplied by the temperature correction coefficient ekthuf[x] to calculate an estimated value correction amount ecthuf[x] (Step 110). The estimated value correction amount ecthuf[x] is added to a catalyst temperature estimated value (Step 114).
    • 本发明的目的是提供一种内燃机的排气净化装置,其能够获得与内燃机的排气通道中的催化剂有关的精确的温度信息。 计算催化剂入口气体温度和催化剂后端温度流速的影响程度(结束)(步骤102)。 考虑到影响程度(步骤104),对入口气体温度和催化剂后端温度等级进行加权平均,计算出口气体温度的估计值。 计算催化剂的每个区域的温度校正系数ekthuf [x]作为影响程度的函数f(emthc)(步骤108)。 出口气体温度估计值ethco与出口气体温度的测量值之间的偏差乘以温度校正系数ekthuf [x],以计算估计值校正量ecthuf [x](步骤110)。 将估计值校正量ecthuf [x]加到催化剂温度估计值(步骤114)。