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公开(公告)号：US5719778A
公开(公告)日：1998-02-17
申请号：US500423
申请日：1995-07-10
申请人： Toshihiro Suzumura , Shigenori Isomura , Tomomichi Mizoguchi , Yukihiro Yamashita , Jun Hasegawa
发明人： Toshihiro Suzumura , Shigenori Isomura , Tomomichi Mizoguchi , Yukihiro Yamashita , Jun Hasegawa
IPC分类号： G01N27/41 , F02D41/14 , G01N27/12 , G01N27/406 , G01N27/409 , G05D23/24 , G06F14/00
CPC分类号： G05D23/2401 , G01N27/4067 , G05D23/1928
摘要： In a heater control of an oxygen sensor, a heater control circuit is rendered fully conductive at 100% duty initially to supply full power to a heater until the resistance value of the heater reaches a predetermined initial value corresponding to a predetermined temperature. Then, the duty of the heater control circuit is feedback controlled so that the heater temperature becomes a target value until the internal resistance of the oxygen sensor reaches a target temperature, and further, after the internal resistance of the oxygen sensor S reaches the target temperature, the duty of the heater control circuit is feedback controlled so that the element temperature of the sensor becomes a target value.
摘要翻译： 在氧传感器的加热器控制中，加热器控制电路最初完全以100％的负载导通，以向加热器供电，直到加热器的电阻值达到对应于预定温度的预定初始值。 然后，反馈控制加热器控制电路的占空比，使得加热器温度成为目标值，直到氧传感器的内阻达到目标温度，此外，在氧传感器S的内阻达到目标温度 加热器控制电路的负载被反馈控制，使得传感器的元件温度成为目标值。
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公开(公告)号：US06258232B1
公开(公告)日：2001-07-10
申请号：US09218083
申请日：1998-12-22
IPC分类号： G01N27407
CPC分类号： F02D41/1494 , F02D41/1456 , G01N27/4067
摘要： A sensor element of an A/F sensor is constructed to laminate and integrate a solid electrolyte and a heater. The A/F sensor outputs a linear A/F detection signal proportional to the oxygen concentration in exhaust gases, when voltage is applied. An ECU controls the heater through heater control circuit to keep the sensor element at a predetermined activation temperature. The ECU detects an element resistance on the basis of the voltage applied to the sensor element and sensor current caused by the applied voltage, and converts the element resistance to an element temperature. During the temperature increasing of the A/F sensor, the current supply to the heater is duty-controlled according to the element temperature changing rate (the temperature increasing rate of the sensor element). Accordingly, the temperature increasing characteristics of the sensor is satisfactorily maintained, and disadvantages such as an element cracking are prevented.
摘要翻译： A / F传感器的传感器元件被构造成层压和集成固体电解质和加热器。 当施加电压时，A / F传感器输出与排气中的氧浓度成比例的线性A / F检测信号。 ECU通过加热器控制电路控制加热器，以将传感器元件保持在预定的活化温度。 ECU根据施加到传感器元件的电压和由施加电压引起的传感器电流检测元件电阻，并将元件电阻转换为元件温度。 在A / F传感器的温度升高期间，根据元件温度变化率（传感器元件的升温速率）对加热器的电流进行占空比控制。 因此，能够令人满意地保持传感器的升温特性，防止元件破裂等缺点。
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公开(公告)号：US5487270A
公开(公告)日：1996-01-30
申请号：US085378
申请日：1993-07-02
CPC分类号： F02D41/0295 , F01N11/007 , F02D41/1441 , F02D41/1477 , F01N2550/02 , F01N2900/0422 , F02D2041/1409 , F02D2041/1415 , F02D2041/1418 , F02D2041/1433 , F02D2200/0814 , Y02T10/47
摘要： An air-fuel ratio control system for an internal combustion engine includes two air-fuel ratio sensors, one upstream of a catalytic converter and the other downstream of the catalytic converter. When an output of the downstream air-fuel ratio sensor has been inverted between rich and lean, a target air-fuel ratio is corrected by a skip amount in a direction opposite to that of the inversion. On the other hand, at no inversion, the target air-fuel ratio is corrected by an integral amount in a direction opposite to deviation of the output of the downstream air-fuel ratio sensor. A fuel injection amount is derived based on a differential between the target air-fuel ratio and an output of the upstream air-fuel ratio sensor. An engine operating condition, the output of the downstream air-fuel ratio sensor or a deterioration degree of the catalytic converter may be used to change the skip amount and the integral amount.
摘要翻译： 用于内燃机的空燃比控制系统包括两个空燃比传感器，一个在催化转化器的上游，另一个催化转化器的下游。 当下游空燃比传感器的输出在富和稀之间反转时，通过与反转方向相反的方向的跳跃量校正目标空燃比。 另一方面，在没有反转的情况下，目标空燃比以与下游空燃比传感器的输出的偏差相反的方向校正积分量。 基于目标空燃比和上游空燃比传感器的输出之间的差异导出燃料喷射量。 可以使用发动机工作状态，下游空燃比传感器的输出或催化转化器的劣化程度来改变跳跃量和积分量。
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公开(公告)号：US5353775A
公开(公告)日：1994-10-11
申请号：US9199
申请日：1993-01-26
IPC分类号： F02D41/14 , G01K7/00 , G01N27/409 , G01N27/26
CPC分类号： F02D41/1494
摘要： An engine temperature is measured an opening of a door is detected so an electrical conduction is made to a heater for heating a sensor element by setting a target element temperature to a relatively high level if such engine temperature (cooling water temperature Thw) is relatively low or, on the other hand, by setting the target element temperature to a relatively low level if the cooling water temperature is relatively high. Then the element temperature is detected and the heater is turned off when the element temperature has reached the target temperature.
摘要翻译： 如果发动机温度（冷却水温度Thw）相对较低，则检测到发动机的温度，使得检测到门的开口，使得通过将目标元件温度设定为相对较高的水平来对用于加热传感器元件的加热器进行导通 或者另一方面，如果冷却水温度相对较高，则通过将目标元件温度设定为相对较低的水平。 然后，当元件温度达到目标温度时，检测元件温度并关闭加热器。
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公开(公告)号：US5491975A
公开(公告)日：1996-02-20
申请号：US85379
申请日：1993-07-02
CPC分类号： F02D41/1441 , F02D41/2454 , F02D41/2474 , F02D41/2477
摘要： In an air-fuel ratio control system for an internal combustion engine, a target air-fuel ratio is set on a side opposite to a direction of deviation of a monitored upstream side air-fuel ratio in such a manner as to counterbalance or offset the deviation of the upstream side air-fuel ratio. The deviation of the upstream side air-fuel ratio may be derived in the form of an mount of a particular component adsorbed in a catalytic converter. A learned value may be used to correct the monitored upstream side air-fuel ratio. Further, a monitored downstream side air-fuel ratio may be used to monitor the setting of the target air-fuel ratio.
摘要翻译： 在内燃机的空燃比控制装置中，将目标空燃比设定在与被监测的上游侧空燃比的偏离方向相反的一侧，以抵消或抵消 上游侧空燃比的偏差。 上游侧空燃比的偏差可以以吸附在催化转化器中的特定成分的载体的形式得到。 可以使用学习值来校正所监视的上游侧空燃比。 此外，可以使用监视的下游侧空燃比来监视目标空燃比的设定。
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公开(公告)号：US06263668B1
公开(公告)日：2001-07-24
申请号：US09668636
申请日：2000-09-25
IPC分类号： F01N310
CPC分类号： F01N3/0842 , F01N13/009 , F01N2250/12 , F01N2370/02 , F02D41/027 , F02D41/0275 , F02D41/1402 , F02D41/1456 , F02D41/1463 , F02D41/1475
摘要： In an engine exhaust system, an NOx catalyst for occluding NOx in a state of the lean air-fuel ratio and reducing the occluded NOx in the state of the rich air-fuel ration A CPU sets a target air-fuel ratio of a mixture supplied to an engine to the lean side with respect to the stoichiometric air-fuel ratio for the lean mixture combustion. The CPU sets a rich time for a rich mixture combustion in accordance with the engine operating state and the NOx purification rate in the NOx catalyst. In this moment, the shortest rich time is set within a range in which a desired NOx purification rate by the NOx catalyst is obtained. A three-way catalyst may be arranged upstream of the NOx catalyst. The three-way catalyst carries only a noble metal such as platinum having no oxygen storing capability.
摘要翻译： 在发动机排气系统中，在浓空燃比A CPU的状态下，以稀空燃比的状态吸入NOx的NO x催化剂和减少吸入的NOx，设定供给的混合物的目标空燃比 相对于贫混合物燃烧的化学计量空燃比，发动机到稀薄侧。 根据发动机运转状态和NOx催化剂的NOx净化率，CPU为丰富的混合燃烧设定了丰富的时间。 此时，将最短的富集时间设定在得到NOx催化剂的期望的NOx净化率的范围内。 可以在NOx催化剂的上游设置三元催化剂。 三元催化剂仅携带不具有氧气存储能力的铂等贵金属。
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公开(公告)号：US6148612A
公开(公告)日：2000-11-21
申请号：US166937
申请日：1998-10-06
CPC分类号： F01N3/0842 , F01N13/009 , F02D41/027 , F02D41/0275 , F02D41/1463 , F02D41/1475 , F01N2250/12 , F01N2370/02 , F02D41/1402 , F02D41/1456
摘要： In an engine exhaust system, an NOx catalyst for occluding NOx in a state of the lean air-fuel ratio and reducing the occluded NOx in the state of the rich air-fuel ratio. A CPU sets a target air-fuel ratio of a mixture supplied to an engine to the lean side with respect to the stoichiometric air-fuel ratio for the lean mixture combustion. The CPU sets a rich time for a rich mixture combustion in accordance with the engine operating state and the NOx purification rate in the NOx catalyst. In this moment, the shortest rich time is set within a range in which a desired NOx purification rate by the NOx catalyst is obtained. A three-way catalyst may be arranged upstream of the NOx catalyst. The three-way catalyst carries only a noble metal such as platinum having no oxygen storing capability.
摘要翻译： 在发动机排气系统中，在浓空燃比的状态下，在稀空燃比的状态下吸附NOx的NOx催化剂和减少封闭的NOx。 CPU将供给发动机的混合物的目标空燃比设定为相对于稀混合燃烧的理论空燃比。 根据发动机运转状态和NOx催化剂的NOx净化率，CPU为丰富的混合燃烧设定了丰富的时间。 此时，将最短的富集时间设定在得到NOx催化剂的期望的NOx净化率的范围内。 可以在NOx催化剂的上游设置三元催化剂。 三元催化剂仅携带不具有氧气存储能力的铂等贵金属。
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8.发明授权Method and apparatus for detecting saturation gas amount absorbed by catalytic converter 失效用于检测催化转化器吸收的饱和气体量的方法和装置
公开(公告)号：US5622047A
公开(公告)日：1997-04-22
申请号：US318599
申请日：1994-10-05
CPC分类号： F02D41/1441 , F01N11/007 , F02D41/1477 , F01N2550/02 , F01N2900/0422 , Y02T10/47
摘要： In an apparatus for detecting a saturation gas amount absorbed by a catalytic converter disposed in an exhaust system of an engine, an air-to-fuel ratio detecting device is disposed in a region of the engine exhaust system downstream of the catalytic converter for monitoring exhaust gas, which has passed through the catalytic converter, to detect an air-to-fuel ratio of an air-fuel mixture causing the exhaust gas. An air-to-fuel ratio changing device serves to change an air-to-fuel ratio of an air-fuel mixture fed to the engine by a correction quantity in a given direction, and serves to maintain changing the air-to-fuel ratio during a correction time. A change increasing device serves to increase the correction quantity and/or the correction time by the air-to-fuel ratio changing device to execute an air-to-fuel ratio changing process again in cases where the air-to-fuel ratio detected by the air-to-fuel ratio detecting device does not vary even when the air-to-fuel ratio changing device executes changing the air-to-fuel ratio. A saturation gas amount calculating device serves to calculate a saturation gas amount absorbed by the catalytic converter on the basis of the correction quantity and the correction time in cases where the air-to-fuel ratio detected by the air-to-fuel ratio detecting device varies when the air-to-fuel ratio changing device executes changing the air-to-fuel ratio.
摘要翻译： 在用于检测由设置在发动机的排气系统中的催化转化器吸收的饱和气体量的装置中，空气 - 燃料比检测装置设置在用于监测排气的催化转化器的下游的发动机排气系统的区域 已经通过催化转化器的气体检测引起废气的空气 - 燃料混合物的空燃比。 空燃比改变装置用于通过给定方向的校正量来改变供给发动机的空气燃料混合物的空燃比，并且用于维持空燃比的变化 在修正时间。 变化增加装置用于通过空燃比改变装置增加校正量和/或校正时间，以在由空气 - 燃料比变化装置检测到的空燃比的情况下再次执行空燃比变更处理 空燃比检测装置即使当空燃比改变装置执行改变空燃比时也不变化。 饱和气体量计算装置用于根据空气 - 燃料比检测装置检测到的空气燃料比，基于校正量和校正时间来计算由催化转化器吸收的饱和气体量 当空燃比改变装置执行改变空燃比时，会发生变化。
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公开(公告)号：US5390491A
公开(公告)日：1995-02-21
申请号：US186157
申请日：1994-01-25
CPC分类号： F01N11/007 , F02D41/0255 , F02P5/1506 , F01N2550/02 , F01N2900/0422 , Y02T10/26 , Y02T10/46 , Y02T10/47
摘要： An ignition timing control system for an internal combustion engine which can perform fast catalyst warm-up operation and prevent stalling at the restart of the internal combustion engine at a low temperature is disclosed. This control system judges whether the engine is in the start state or not, whether the cooling water temperature is lower than the specified temperature or not, and whether the intake air temperature is higher than the preset temperature or not. When these judgments are all affirmative, the system further judges whether the time after the start has reached the control starting time or not, and then whether the engine is in the idle operation state or not. When these judgments are both affirmative, the system sets the target ignition timing retard amount and the ignition timing gradual change time according to the intake air temperature, and then actually performs the ignition timing control according to the target retard amount and gradual retard time. Alternatively, the control system judges deterioration state of a catalyst and controls the ignition timing in dependence on the catalyst deterioration state and the intake air temperature.
摘要翻译： 公开了一种用于内燃机的点火正时控制系统，其能够执行快速催化剂预热操作并且防止内燃机在低温重启时的停止。 该控制系统判断发动机是否处于开始状态，冷却水温度是否低于规定温度，以及进气温度是否高于预设温度。 当这些判断是肯定的时，系统进一步判断起动时间是否达到控制开始时间，然后判断发动机是否处于空转运转状态。 当这些判断是肯定的时，系统根据进气温度设定目标点火正时延迟量和点火正时逐渐变化时间，然后根据目标延迟量和逐渐延迟时间实际执行点火正时控制。 或者，控制系统判断催化剂的劣化状态，并根据催化剂劣化状态和进气温度来控制点火正时。
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公开(公告)号：US5570574A
公开(公告)日：1996-11-05
申请号：US352208
申请日：1994-12-02
CPC分类号： F02B75/22 , F02D41/1443
摘要： An air-fuel ratio control system for an internal combustion engine includes a pair of cylinder banks, a pair of exhaust passages connected to the cylinder banks, respectively, a common exhaust pipe where the exhaust passages join each other at their downstream ends, a pair of catalytic converters provided in the exhaust passages, respectively, a pair of main air-fuel ratio sensors provided in the exhaust passages upstream of the catalytic converters, respectively, a pair of auxiliary air-fuel ratio sensors provided in the exhaust passages downstream of the catalytic converters, respectively, and a catalytic converter provided in the common exhaust pipe. The system derives an air-fuel ratio feedback control correction value for each of the cylinder banks based on outputs of the auxiliary air-fuel ratio sensors. The system derives the air-fuel ratio feedback control correction values in such a manner as to control the outputs of the auxiliary air-fuel ratio sensors to be in antiphase with each other when the outputs of the auxiliary air-fuel ratio sensors are in phase with each other. This arrangement ensures effective purification of exhaust gases at the catalytic converter provided in the common exhaust pipe.
摘要翻译： 一种用于内燃机的空燃比控制系统包括一对气缸组，分别连接到气缸组的一对排气通道，排气通道在其下游端彼此连接的公共排气管，一对 设置在排气通道中的催化转化器分别设置在催化转化器上游的排气通道中的一对主空气燃料比传感器，一对辅助空燃比传感器，设置在排气通道下游的排气通道中 催化转化器，以及设置在普通排气管中的催化转化器。 该系统基于辅助空燃比传感器的输出，得出每个气缸组的空燃比反馈控制校正值。 当辅助空燃比传感器的输出相位相同时，该系统以这样的方式获得空燃比反馈控制校正值，以便控制辅助空燃比传感器的输出反相 与彼此。 这种布置确保了在设置在公共排气管中的催化转化器上有效净化废气。
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