公开(公告)号：US20060090456A1

公开(公告)日：2006-05-04

申请号：US11196422

申请日：2005-08-04

申请人： Hideaki Tani ,  Kuen Yehliu ,  Keiichi Enoki ,  Tadahiro Azuma

发明人： Hideaki Tani ,  Kuen Yehliu ,  Keiichi Enoki ,  Tadahiro Azuma

IPC分类号： F01N3/00

CPC分类号： F01N11/007 ,  Y02T10/22 ,  Y02T10/47

摘要： A control apparatus for an internal combustion engine can detect degradation of a three-way catalyst with high accuracy without causing deterioration in an exhaust. A pair of first and second air fuel ratio detectors are disposed in an exhaust system at locations upstream and downstream of the three-way catalyst for detecting a first and a second air fuel ratio of an exhaust gas. A target oxygen change amount calculator calculates a target oxygen change amount of the three-way catalyst, and an oxygen change amount calculator calculates an oxygen change amount of the three-way catalyst from an amount of exhaust gas passing through the three-way catalyst and the first air fuel ratio. An air fuel ratio operator inversely controls the air fuel ratio to a rich side and a lean side with a prescribed air fuel ratio width each time the oxygen change amount reaches a target oxygen change amount.

摘要翻译： 内燃机的控制装置可以高精度地检测三元催化剂的劣化，而不会引起排气的劣化。 一对第一和第二空燃比检测器设置在用于检测排气的第一和第二空气燃料比的三元催化剂的上游和下游的排气系统中。 目标氧气变化量计算器计算三元催化剂的目标氧气变化量，氧气变化量计算器根据通过三元催化剂的排气量和三元催化剂的氧气换算量， 第一空燃比。 每当氧气变化量达到目标氧气变化量时，空燃比运算符反向控制具有规定空燃比宽度的富侧和稀侧的空燃比。

公开(公告)号：US07293404B2

公开(公告)日：2007-11-13

申请号：US11326403

申请日：2006-01-06

申请人： Keiichi Enoki ,  Kuen Yehliu

发明人： Keiichi Enoki ,  Kuen Yehliu

IPC分类号： F01N3/00

CPC分类号： F02D41/1441 ,  F01N11/007 ,  F01N2900/0422 ,  F02D41/0235 ,  F02D41/1488 ,  F02D41/22 ,  F02D41/2454 ,  Y02T10/47

摘要： A device includes: downstream air-fuel ratio feedback control unit that performs feedback control of an upstream target air-fuel ratio so that a downstream air-fuel ratio detected by a downstream air-fuel ratio detecting unit coincides with a downstream target air-fuel ratio; a target air-fuel ratio varying unit that varies the upstream target air-fuel ratio at the time of diagnosing degradation of a ternary catalyst; and a catalyst degradation judging unit that judges catalyst degradation from the behavior of the downstream air-fuel ratio at the time of diagnosing degradation of the ternary catalyst. When diagnosing degradation of the ternary catalyst, the downstream air-fuel ratio feedback control unit is stopped or its control constant is set at a smaller value. Thus, when varying the air-fuel ratio for diagnosing catalyst degradation, interference between downstream air-fuel ratio feedback and upstream air-fuel ratio feedback is prevented and catalyst degradation is accurately diagnosed.

摘要翻译： 一种装置包括：下游空燃比反馈控制单元，其执行上游目标空燃比的反馈控制，使得由下游空燃比检测单元检测的下游空燃比与下游目标空气燃料 比; 目标空燃比变化单元，其在诊断三元催化剂的劣化时改变上游目标空燃比; 以及催化剂劣化判定单元，其在诊断三元催化剂的劣化时，根据下游空燃比的行为来判定催化剂劣化。 当诊断三元催化剂的劣化时，下游空燃比反馈控制单元停止或将其控制常数设定为较小的值。 因此，当改变用于诊断催化剂劣化的空燃比时，防止下游空燃比反馈与上游空燃比反馈之间的干扰，并且精确地诊断催化剂劣化。

公开(公告)号：US20070033924A1

公开(公告)日：2007-02-15

申请号：US11326403

申请日：2006-01-06

申请人： Keiichi Enoki ,  Kuen Yehliu

发明人： Keiichi Enoki ,  Kuen Yehliu

IPC分类号： F01N3/00 ,  F01N7/00 ,  F02D41/14

CPC分类号： F02D41/1441 ,  F01N11/007 ,  F01N2900/0422 ,  F02D41/0235 ,  F02D41/1488 ,  F02D41/22 ,  F02D41/2454 ,  Y02T10/47

摘要： A device includes: downstream air-fuel ratio feedback control unit that performs feedback control of an upstream target air-fuel ratio so that a downstream air-fuel ratio detected by a downstream air-fuel ratio detecting unit coincides with a downstream target air-fuel ratio; a target air-fuel ratio varying unit that varies the upstream target air-fuel ratio at the time of diagnosing degradation of a ternary catalyst; and a catalyst degradation judging unit that judges catalyst degradation from the behavior of the downstream air-fuel ratio at the time of diagnosing degradation of the ternary catalyst. When diagnosing degradation of the ternary catalyst, the downstream air-fuel ratio feedback control unit is stopped or its control constant is set at a smaller value. Thus, when varying the air-fuel ratio for diagnosing catalyst degradation, interference between downstream air-fuel ratio feedback and upstream air-fuel ratio feedback is prevented and catalyst degradation is accurately diagnosed.

公开(公告)号：US07168240B2

公开(公告)日：2007-01-30

申请号：US11196422

申请日：2005-08-04

申请人： Hideaki Tani ,  Kuen Yehliu ,  Keiichi Enoki ,  Tadahiro Azuma

发明人： Hideaki Tani ,  Kuen Yehliu ,  Keiichi Enoki ,  Tadahiro Azuma

IPC分类号： F01N3/00

CPC分类号： F01N11/007 ,  Y02T10/22 ,  Y02T10/47

摘要： A control apparatus for an internal combustion engine can detect degradation of a three-way catalyst with high accuracy without causing deterioration in an exhaust. A pair of first and second air fuel ratio detectors are disposed in an exhaust system at locations upstream and downstream of the three-way catalyst for detecting a first and a second air fuel ratio of an exhaust gas. A target oxygen change amount calculator calculates a target oxygen change amount of the three-way catalyst, and an oxygen change amount calculator calculates an oxygen change amount of the three-way catalyst from an amount of exhaust gas passing through the three-way catalyst and the first air fuel ratio. An air fuel ratio operator inversely controls the air fuel ratio to a rich side and a lean side with a prescribed air fuel ratio width each time the oxygen change amount reaches a target oxygen change amount.

摘要翻译： 内燃机的控制装置可以高精度地检测三元催化剂的劣化，而不会引起排气的劣化。 一对第一和第二空燃比检测器设置在用于检测排气的第一和第二空气燃料比的三元催化剂的上游和下游的排气系统中。 目标氧气变化量计算器计算三元催化剂的目标氧气变化量，氧气变化量计算器根据通过三元催化剂的排气量和三元催化剂的氧气换算量， 第一空燃比。 每当氧气变化量达到目标氧气变化量时，空燃比运算符反向控制具有规定空燃比宽度的富侧和稀侧的空燃比。