公开(公告)号：US5154054A

公开(公告)日：1992-10-13

申请号：US735024

申请日：1991-07-24

申请人： Hiroaki Nakane ,  Noriaki Kurita

发明人： Hiroaki Nakane ,  Noriaki Kurita

IPC分类号： F02D41/14 ,  F02D45/00 ,  G01N27/26

CPC分类号： F02D41/1495 ,  F02D41/1441 ,  F02D41/1481

摘要： According to the present invention, in a system wherein O.sub.2 sensors are disposed on upstream and downstream sides, respectively, of a catalytic converter, and an air-fuel ratio coefficient for the amount of fuel to be injected is determined on the basis of an output of the upstream-side O.sub.2 sensor, the deterioration of the upstream-side O.sub.2 sensor. More particularly, a delay is added to the output of the upstream-side O.sub.2 sensor in accordance with an output signal provided from the downstream-side O.sub.2 sensor, then an air-fuel ratio F/B control is performed in accordance with the delayed output, and when the F/B control period has become longer than a predetermined value, it is judged that the upstream-side O.sub.2 is deteriorated. As a result, not only the deterioration of response characteristic but also the deterioration caused by the Z characteristic center can be detected because it appears as a change of the F/B control period.

摘要翻译： 根据本发明，在分别在催化转化器的上游侧和下游侧配置有O 2传感器的系统中，基于输出来确定燃料量的空燃比系数 上游侧O2传感器的劣化。 更具体地，根据从下游侧O2传感器提供的输出信号，向上游侧O2传感器的输出添加延迟，然后根据延迟输出执行空燃比F / B控制 ，并且当F / B控制周期变得长于预定值时，判断上游侧O2劣化。 结果，不仅可以检测出由于F / B控制周期的变化而导致的响应特性的恶化，而且可以检测由Z特性中心引起的劣化。

公开(公告)号：US5097700A

公开(公告)日：1992-03-24

申请号：US661127

申请日：1991-02-27

申请人： Hiroaki Nakane

发明人： Hiroaki Nakane

IPC分类号： F02D41/14 ,  F01N3/20 ,  F01N11/00 ,  F02D41/22 ,  F02D45/00

CPC分类号： F01N11/007 ,  F01N2550/02 ,  Y02T10/47

摘要： An apparatus for judging of a catalyst of a catalytic converter provided in an exhaust system of an internal combustion engine so as to purify an exhaust gas generated from the internal combustion engine. The apparatus is arranged to be responsive to the output signal of a gas concentration sensor provided downstream of the converter to detect a concentration of a specified component of the exhaust gas. Included in the apparatus is a judgment unit responsive to the output signal therefrom so as to judge the catalyst of the catalytic converter on the basis of the output signal therefrom. The judgment unit compares a predetermined judgment threshold with an amplitude of the output signal therefrom to detect, on the basis of the comparison result, whether the catalyst of the converter is in a deteriorated state. The judgment unit relatively corrects the predetermined judgment threshold with respect to the output signal on the basis of the difference between the output signal therefrom under the condition that an air-fuel ratio is in a predetermined rich state and the output signal therefrom under the condition that the air-fuel ratio is in a predetermined lean state. This arrangement allows accurate detection of the deterioration of the catalyst irrespective of the deterioration of the gas concentration sensor itself.

摘要翻译： 一种用于判断设置在内燃机的排气系统中的催化转化器的催化剂以净化由内燃机产生的废气的装置。 该装置被布置成响应于设置在转换器下游的气体浓度传感器的输出信号，以检测废气的指定部件的浓度。 装置中包括响应于其输出信号的判断单元，以便根据其输出信号判断催化转化器的催化剂。 判断单元将预定的判断阈值与其输出信号的振幅进行比较，以根据比较结果检测转换器的催化剂是否处于劣化状态。 在空燃比处于预定浓度状态的条件下，判断单元基于其输出信号与其输出信号之间的差异，相对于输出信号校正预定判定阈值，条件是 空燃比处于预定的稀薄状态。 这种布置允许精确地检测催化剂的劣化，而与气体浓度传感器本身的劣化无关。

公开(公告)号：US5154055A

公开(公告)日：1992-10-13

申请号：US642310

申请日：1991-01-18

申请人： Hiroaki Nakane ,  Katsuhiko Nakabayashi ,  Noriaki Kurita

发明人： Hiroaki Nakane ,  Katsuhiko Nakabayashi ,  Noriaki Kurita

IPC分类号： F01N11/00 ,  F02D41/14

CPC分类号： F02D41/1441 ,  F01N11/007 ,  F01N2550/02 ,  F01N2900/0422 ,  Y02T10/47

摘要： An apparatus for detecting a purification factor of a catalyst for purifying an exhaust gas of an internal combustion engine comprises a catalyst disposed in an exhaust system of the internal combustion engine for purifying an exhaust gas, first and second air-fuel ratio sensors disposed upstream and downstream of the catalyst for detecting air-fuel ratios, respectively, a response delay time difference detecting device for detecting differences in response delay time between the first and second air-fuel ratio sensors in respective different operation states of the engine, a purification factor detecting device for detecting a purification factor of the catalyst on the basis of a deviation between the first and second response delay time differences detected in respective different operation states of the engine. Since the purification factor of the catalyst is detected on the basis of a deviation between the first and second response delay time differences detected in the respective different engine operation states, the purification factor of the catalyst can be detected with high accuracy independently of response characteristics of the first and second air-fuel ratio sensors themselves.

摘要翻译： 用于检测用于净化内燃机的排气的催化剂的净化系数的装置包括：设置在用于净化废气的内燃机的排气系统中的催化剂，设置在上游的第一和第二空燃比传感器， 分别用于检测空燃比的催化剂的下游;响应延迟时间差检测装置，用于检测发动机的各种不同操作状态下的第一和第二空燃比传感器之间的响应延迟时间的差异;净化因子检测 基于在各个不同运行状态下检测到的第一和第二响应延迟时间差之间的偏差来检测催化剂的净化系数的装置。 由于基于在各个不同的发动机运转状态下检测到的第一和第二响应延迟时间差之间的偏差来检测催化剂的净化因子，所以能够高精度地检测催化剂的净化系数，而与 第一和第二空燃比传感器本身。