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1.发明授权Apparatus for controlling air-fuel ratio using air-fuel ratio sensor associated with heater 失效使用与加热器相关联的空燃比传感器来控制空燃比的装置
公开(公告)号：US5101625A
公开(公告)日：1992-04-07
申请号：US615698
申请日：1990-11-05
申请人： Tadashi Sugino , Michio Furuhashi , Noriaki Kurita
发明人： Tadashi Sugino , Michio Furuhashi , Noriaki Kurita
CPC分类号： F02D41/1494 , F02D41/1441
摘要： In an apparatus for controlling an air-fuel ratio in an internal combustion engine, a main air-fuel ratio sensor having an element temperature strongly affected by the temperature thereof, a sub air-fuel ration sensor having an element temperature weakly affected by the temperature thereof, and a heater associated with the main air-fuel ratio sensor are provided. The resistance value or electric power of the heater is controlled in accordance with the output of the sub air-fuel ratio sensor.
摘要翻译： 在用于控制内燃机中的空燃比的装置中，具有受其温度强烈影响的元件温度的主空燃比传感器，具有受温度弱的元素温度的副空气 - 燃料比传感器 并且设置与主空燃比传感器相关联的加热器。 根据副空燃比传感器的输出来控制加热器的电阻值或电力。
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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
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。
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3.发明授权
公开(公告)号：US5279114A
公开(公告)日：1994-01-18
申请号：US996811
申请日：1992-12-23
CPC分类号： F01N11/007 , F02D41/1443 , F01N2470/14 , F01N2550/02 , Y02T10/47
摘要： Disclosed is an apparatus for detecting deterioration of a catalyst of an internal combustion engine having a plurality of cylinder banks in such a manner that the deterioration of the catalyst can be assuredly discriminated regardless of the presence of deviation of a control phase with respect to each cylinder bank. The influence of change of the air/fuel ratio can be eliminated considerably by reducing the air/fuel ratio correction coefficient for a right bank, or by also using the correction coefficient for the left bank as that for the right bank to cause the phases of them to be synchronized with each other, or by dither-controlling the right bank. Therefore, the change of the air/fuel ratio with respect to the left bank can be assuredly detected while necessitating one sub air/fuel ratio sensor. By discriminating the state of deterioration of the catalyst in accordance with results of detections made by the left air/fuel ratio sensor and the sub air/fuel ratio sensors, the deterioration of the catalyst can be assuredly discriminated regardless of the presence of deviation of control phase with respect to the two banks.
摘要翻译： 公开了一种用于检测具有多个气缸组的内燃机的催化剂的劣化的装置，使得可以可靠地区分催化剂的劣化，而不管控制阶段相对于每个气缸的偏差是否存在 银行。 空燃比变化的影响可以通过降低右岸的空燃比校正系数而得到很大的消除，也可以利用左岸的校正系数作为右岸的校正系数， 他们要彼此同步，或者通过抖动控制右边的银行。 因此，在需要一个副空气/燃料比传感器的同时，能够可靠地检测空气/燃料比相对于左岸的变化。 通过根据左空燃比传感器和副空气/燃料比传感器的检测结果来区分催化剂的劣化状态，可以可靠地区分催化剂的劣化，而不管控制的偏差是否存在 相对于两家银行。
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公开(公告)号：US5115781A
公开(公告)日：1992-05-26
申请号：US693092
申请日：1991-04-30
IPC分类号： F02D41/14
CPC分类号： F02D41/1479 , F02D41/2454 , F02D41/2474
摘要： A relation with output characteristic of an oxygen density sensor corresponding to a deviation of an air fuel ratio of a mixed gas supplied actually to an internal combustion engine from a desired air fuel ratio is stored beforehand in an air fuel ratio controller of the present invention. Then, the air fuel ratio deviation is computed correspondingly to an actual output of the oxygen density sensor according to the stored relation, and an air fuel ratio controlled variable is corrected according to the computed air fuel ratio deviation, thereby controlling the air fuel ratio to the desired air fuel ratio. Further, a change in output characteristic of the oxygen density sensor to the air fuel ratio is detected, then the output characteristic of the oxygen density sensor stored beforehand is corrected according to the detection result, and thus if the output characteristic of the oxygen density sensor fluctuates due to a deterioration arising on the oxygen density sensor, the air fuel ratio controlled variable will be decided in consideration of the fluctuation.
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5.发明授权Apparatus for detecting purification factor of catalyst in catalytic converter of internal combustion engine 失效用于检测内燃机催化转化器中催化剂净化因子的装置
公开(公告)号：US5220788A
公开(公告)日：1993-06-22
申请号：US749526
申请日：1991-08-26
CPC分类号： F01N11/007 , F01N2550/02 , F01N2900/0422 , Y02T10/47
摘要： Deterioration of a catalyst of a catalytic converter of an internal combustion engine is detected, during negative feedback control of the air-fuel ratio based on an output signal from at least one of a pair of O.sub.2 sensors disposed respectively upstream and downstream from the catalyst in the exhaust system. Detection is executed after changing the feedback period, which is the period of alternation of a feedback correction coefficient used to control the fuel injection quantity, with the change in period being such as to provide improved accuracy of detection of catalyst deterioration. The change may consist of a single step change, in which the feedback period is set to a specific predetermined value at which the output signal amplitude from the downstream sensor, or the phase difference between the two sensor output signals, should be within predetermined limits if the catalyst is in satisfactory condition.
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公开(公告)号：US5154055A
公开(公告)日：1992-10-13
申请号：US642310
申请日：1991-01-18
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。
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