公开(公告)号：US06718252B2

公开(公告)日：2004-04-06

申请号：US09981241

申请日：2001-10-18

申请人： Katsuhiko Kawai ,  Hisashi Iida ,  Muneyuki Iwata

发明人： Katsuhiko Kawai ,  Hisashi Iida ,  Muneyuki Iwata

IPC分类号： F02D4114

CPC分类号： F02D41/1401 ,  F02D41/1454 ,  F02D41/16 ,  F02D2041/1415 ,  F02D2041/1422 ,  F02D2041/1433

摘要： Calculation of a present air-fuel ratio correction coefficient correction value &Dgr;FAF (i) is based on a control parameter calculated by an ECU, a change in air-fuel ratio detected by an air-fuel ratio sensor, a deviation of an actual air-fuel ratio from a target air-fuel ratio and an immediately preceding air-fuel ratio correction coefficient correction value &Dgr;FAF (i−1) Then, a present air-fuel ratio correction coefficient FAF (i) is found by adding the present air-fuel ratio correction coefficient correction value &Dgr;FAF (i) to an immediately preceding air-fuel ratio correction coefficient FAF (i−1). As a result, the air-fuel ratio correction coefficients is not be thrown into confusion and no phenomenon of the air-fuel ratio being thrown into confusion occurs even if the control parameter is changed in accordance with operating conditions of the engine.

摘要翻译： 目前的空燃比校正系数校正值ΔFAF（i）的计算基于由ECU计算的控制参数，由空燃比传感器检测的空燃比的变化，实际空燃比校正系数校正值的偏差， 从目标空燃比和前一个空燃比校正系数校正值ΔFAF（i-1）得到的燃料比，然后，通过将现有的空气燃料添加到现有的空燃比校正系数FAF（i） 比率校正系数校正值DeltaFAF（i）与前一个空燃比校正系数FAF（i-1）。 结果，空燃比校正系数不会被混淆，即使控制参数根据发动机的运行条件而变化，也不会发生空燃比的混乱现象。

公开(公告)号：US06601383B2

公开(公告)日：2003-08-05

申请号：US10045026

申请日：2002-01-15

申请人： Jun Hasegawa ,  Kouichi Shimizu ,  Hisashi Iida

发明人： Jun Hasegawa ,  Kouichi Shimizu ,  Hisashi Iida

IPC分类号： F01N300

CPC分类号： F01N3/0835 ,  F01N3/0814 ,  F01N11/002 ,  F01N11/007 ,  F01N13/009 ,  F01N2550/03 ,  F02D41/027 ,  Y02T10/47

摘要： An emission control apparatus for an engine has a plurality of catalysts disposed in series in an exhaust passage. An HC absorbent catalyst is utilized for at least one of the catalysts. An ECU controls an A/F ratio in an upstream side of the HC absorbent catalyst at a target value. The target value is corrected to a leaner value when the HC absorbent catalyst is in a desorbing condition. The leaner value is leaner than the target value during the HC absorbent catalyst is in an absorbing condition or an activated condition. The leaner atmosphere provides sufficient of oxygen to purify desorbed HC from the HC absorbent catalyst itself.

公开(公告)号：US06539707B2

公开(公告)日：2003-04-01

申请号：US09968837

申请日：2001-10-03

申请人： Noriaki Ikemoto ,  Yukihiro Yamashita ,  Hisashi Iida ,  Kouichi Shimizu

发明人： Noriaki Ikemoto ,  Yukihiro Yamashita ,  Hisashi Iida ,  Kouichi Shimizu

IPC分类号： F01N300

CPC分类号： F02D41/1474 ,  F01N13/009 ,  F02D41/123 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1483 ,  F02D41/1495

摘要： An upstream catalyst and a downstream catalyst are disposed in series in an exhaust pipe, and first through third sensors for detecting the air-fuel ratio or an adsorption amount of hazardous components on the rich/lean side of exhaust gases are disposed on the upstream and downstream sides of the upstream catalyst and the downstream side of the downstream catalyst, respectively. An ECU for controlling an engine controls the air-fuel ratio so that when the adsorption amount of the hazardous components on the rich side of the downstream catalyst is large, that of the hazardous components on the lean side of the upstream catalyst is large. Similarly, the ECU controls the air-fuel ratio so that when the adsorption amount of the hazardous components on the lean side of the downstream catalyst is large, that of the hazardous components on the rich side of the upstream catalyst is large.

公开(公告)号：US6085518A

公开(公告)日：2000-07-11

申请号：US144270

申请日：1998-08-31

申请人： Yukihiro Yamashita ,  Shujiro Morinaga ,  Hisashi Iida ,  Hidenobu Muto

发明人： Yukihiro Yamashita ,  Shujiro Morinaga ,  Hisashi Iida ,  Hidenobu Muto

IPC分类号： F01N3/20 ,  F01N11/00 ,  F02D41/02 ,  F02D41/14 ,  F01N3/00

CPC分类号： F01N11/007 ,  F02D41/0235 ,  F02D41/1441 ,  F01N2550/02 ,  F01N2900/0422 ,  F02D41/1456 ,  F02P2017/003 ,  Y02T10/47

摘要： An air-fuel ratio feedback control has an air-fuel ratio sensor and an oxygen sensor at an upstream side and a downstream side of a catalytic converter. A CPU feedback controls an air-fuel ratio detected by the air-fuel ratio sensor to a target air-fuel ratio, with a feedback gain being varied with an output of the oxygen sensor. The CPU further estimates an air-fuel ratio response speed based on a ratio between an exhaust gas flow amount and a capacity of the catalyst and determines a rate of deterioration of the catalyst. The CPU varies further the feedback gain based on the estimated response speed and the determined rate of deterioration.

摘要翻译： 空燃比反馈控制在催化转化器的上游侧和下游侧具有空燃比传感器和氧传感器。 CPU反馈将由空燃比传感器检测到的空燃比控制为目标空燃比，反馈增益随着氧传感器的输出而变化。 CPU进一步基于废气流量与催化剂的容量之比估计空燃比响应速度，并确定催化剂的劣化率。 CPU根据估计的响应速度和确定的劣化速率进一步反馈反馈增益。

公开(公告)号：US5964208A

公开(公告)日：1999-10-12

申请号：US878064

申请日：1997-06-18

申请人： Yukihiro Yamashita ,  Jun Hasegawa ,  Hisashi Iida ,  Wakichi Kondo ,  Yasuo Sagisaka ,  Masahiko Yamaguchi

发明人： Yukihiro Yamashita ,  Jun Hasegawa ,  Hisashi Iida ,  Wakichi Kondo ,  Yasuo Sagisaka ,  Masahiko Yamaguchi

IPC分类号： F02D41/14 ,  F02D41/22

CPC分类号： F02D41/1495 ,  F02D41/1456 ,  F02D41/22 ,  F02D2041/1432 ,  F02D41/1441 ,  Y02T10/40

摘要： An air/fuel ratio control system controls the supply of fuel to an internal combustion engine to achieve a target air/fuel ratio, based on the output of an air/fuel ratio sensor. The system may determine whether there is an abnormality in the air/fuel ratio sensor based on a comparison between a change of an air/fuel ratio correction coefficient, used to drive the air/fuel ratio to the target value, and a change of the target air/fuel ratio if the target air/fuel ratio has sharply changed. Alternatively, the diagnosis operation may be performed based on a comparison between a total air/fuel ratio correction amount and a change of the air/fuel ratio detected by the air/fuel ratio sensor, a phase difference calculation between peaks of the air/fuel ratio or the air/fuel ratio correction coefficient, or by accumulating the differences between the air/fuel ratio and the target air/fuel ratio, and the differences between the air/fuel ratio correction coefficient and a reference value, and comparing the accumulated values. In addition, the system may detect a sensor abnormality based on the deviation in phase of the air/fuel ratio from the air/fuel ratio correction coefficient. These diagnosis operations can precisely and easily detect the occurrence of an abnormality in the air/fuel ratio sensor. As a result, the air/fuel ratio control system will not use an imprecise output from the sensor for air/fuel ratio control, thus achieving highly precise and highly reliable air/fuel ratio control.

公开(公告)号：US5852228A

公开(公告)日：1998-12-22

申请号：US883590

申请日：1997-06-26

申请人： Yukihiro Yamashita ,  Hisashi Iida ,  Jun Hasegawa

发明人： Yukihiro Yamashita ,  Hisashi Iida ,  Jun Hasegawa

IPC分类号： F02D41/14 ,  G01N27/406

CPC分类号： F02D41/1476 ,  F02D41/1494 ,  G01N27/4067 ,  F02D41/1456

摘要： A sensing element of an oxygen sensor is controlled to keep a target impedance for maintaining activation temperature of the oxygen sensor. As the sensing element deteriorates, its internal impedance increases and power supply to a heater for heating the sensing element increases. The oxygen sensor temperature rises excessively above an activation temperature. To restrict excessive temperature rise, the target impedance is altered when the supply power to the heater exceeds a predetermined reference. The target impedance may be increased with increase in the power supply to the heater. Alternatively, the heater supply power is limited to a predetermined maximum for restricting excessive temperature rise.

公开(公告)号：US5758632A

公开(公告)日：1998-06-02

申请号：US623787

申请日：1996-03-29

申请人： Yukihiro Yamashita ,  Hisashi Iida ,  Yasuo Sagisaka

发明人： Yukihiro Yamashita ,  Hisashi Iida ,  Yasuo Sagisaka

IPC分类号： F02D41/14

CPC分类号： F02D41/1495 ,  F02D41/1456

摘要： The fuel ratio control system controls the supply of fuel to an internal combustion engine to achieve a target air-fuel ratio, based on the output of an air-fuel ratio sensor. The system may determine whether there is an abnormality in the air-fuel ratio sensor based on a comparison between a change of an air-fuel ratio correction coefficient, used to drive the air-fuel ratio to the target value, and a change of the target air-fuel ratio if the target air-fuel ratio has sharply changed. Alternatively, the diagnosis operation may be performed based on a comparison between a total air-fuel ratio correction amount and a change of the air-fuel ratio detected by the air-fuel ratio sensor, a phase difference calculation between peaks of the air-fuel ratio or the air-fuel ratio correction coefficent, or by accumulating the differences between the air-fuel ratio and the target air-fuel ratio, and the differences between the air-fuel ratio correction coefficient and a reference value, and comparing the accumulated values. In addition, the system may detect a sensor abnormality based on the deviation in phase of the air-fuel ratio from the air-fuel ratio correction coefficient. These system may also detect sensor abnormality on the basis of the behavior of the air-fuel ratio during transitional engine operation. As a result, the air-fuel ratio control system will not use an imprecise output from the sensor for air-fuel ratio control, thus achieving highly precise and highly reliable air-fuel ratio control.

摘要翻译： 燃料比控制系统基于空燃比传感器的输出来控制向内燃机供给燃料以实现目标空燃比。 该系统可以基于将用于驱动空燃比与目标值的空燃比校正系数的变化与目标值的变化之间的比较来确定空燃比传感器是否存在异常 如果目标空燃比急剧变化，则为目标空燃比。 或者，可以基于总空燃比校正量与由空燃比传感器检测的空燃比的变化之间的比较，空气燃料的峰值之间的相位差计算来进行诊断操作 或空燃比校正系数，或者通过累积空燃比和目标空燃比之间的差异以及空燃比校正系数与参考值之间的差异，并将累积值 。 此外，系统可以基于空燃比校正系数的空燃比的相位偏差来检测传感器异常。 这些系统还可以基于过渡发动机运转期间的空燃比的行为来检测传感器异常。 结果，空燃比控制系统不会使用来自传感器的空燃比控制的不精确输出，从而实现高精度和高可靠性的空燃比控制。

公开(公告)号：US5727383A

公开(公告)日：1998-03-17

申请号：US597562

申请日：1996-02-02

申请人： Yukihiro Yamashita ,  Hisashi Iida ,  Masaaki Nakayama

发明人： Yukihiro Yamashita ,  Hisashi Iida ,  Masaaki Nakayama

IPC分类号： F01N3/20 ,  F01N11/00 ,  F02D41/02 ,  F02D41/14 ,  F01N3/28

CPC分类号： F01N11/007 ,  F01N2550/02 ,  F01N2900/0422 ,  F02D41/0255 ,  Y02T10/47

摘要： An exhaust pipe of an internal combustion engine is equipped with a three-way catalytic converter. Provided upstream and downstream the converter are an A/F sensor and a downstream O2 sensor, respectively. A CPU executes air-fuel feedback control according to the readings from the A/F sensor. When the period of air-fuel ratio inversion by the downstream O2 sensor has exceeded a predetermined time, the CPU determines that the three-way catalytic converter is activated. At that point, the CPU estimates the quantity of heat required from the start-up of the engine up to catalyst activation. The quantity of heat is obtained by accumulating the intake air quantity from the start of the engine up to catalyst activation (i.e., accumulated intake air quantity). Given the accumulated quantity of heat calculated, the CPU determines accordingly whether the three-way catalytic converter has deteriorated.

摘要翻译： 内燃机的排气管配有三元催化转化器。 在转换器的上游和下游分别设置有A / F传感器和下游O2传感器。 CPU根据A / F传感器的读数执行空燃比反馈控制。 当下游O2传感器的空燃比反转时间超过预定时间时，CPU确定三元催化转化器被激活。 在这一点上，CPU估计从发动机启动到催化剂激活所需的热量。 通过将从发动机起动进入的吸入空气量累积到催化剂活化（即，累积进气量）来获得热量。 给定计算的累计热量，CPU相应地确定三元催化转化器是否劣化。

公开(公告)号：US5672817A

公开(公告)日：1997-09-30

申请号：US574211

申请日：1995-12-13

申请人： Yasuo Sagisaka ,  Masaaki Nakayama ,  Yasuo Mukai ,  Yukihiro Yamashita ,  Hisashi Iida

发明人： Yasuo Sagisaka ,  Masaaki Nakayama ,  Yasuo Mukai ,  Yukihiro Yamashita ,  Hisashi Iida

IPC分类号： F02B77/08 ,  F02D41/12 ,  F02D41/14 ,  F02D41/22 ,  G01M15/00

CPC分类号： F02D41/123 ,  F02D41/1495 ,  F02D41/1456

摘要： A self-diagnostic apparatus of an air-fuel ratio control system of an internal combustion engine performs processes of starting the diagnostic process as the fuel-cut is started, reading and storing a sensor output at the start of the fuel-cut and counting an elapsed time after the start of the fuel-cut by actuating a timer, reading a time until when the sensor output rises from the start of the fuel-cut from the count value of the timer, calculating a rate of change of the sensor output and comparing the calculated rate of change with an abnormality determining value. When the rate of change is large, the response characteristic of the sensor is normal. When it is small, the response characteristic of the sensor is abnormal (degraded), so that the abnormality of the sensor is stored in a memory and an alarm lamp is lighted to inform a driver of the abnormality of the sensor.

摘要翻译： 内燃机的空燃比控制系统的自诊断装置进行燃料切断开始时开始诊断处理的处理，在燃料切断开始时读取并存储传感器输出并对其进行计数 通过启动定时器开始燃料切断后的经过时间，读取一段时间，直到传感器输出从燃料切断开始从计时器的计数值开始上升，计算传感器输出的变化率， 将计算出的变化率与异常判定值进行比较。 当变化率大时，传感器的响应特性正常。 当传感器的响应特性小时，传感器的响应特性异常（劣化），将传感器的异常存储在存储器中，并且点亮报警灯以通知驾驶员传感器的异常。

公开(公告)号：US5284050A

公开(公告)日：1994-02-08

申请号：US863091

申请日：1992-04-03

申请人： Hisashi Iida ,  Toshihiro Suzumura ,  Toshio Kondo ,  Shigenori Isomura

发明人： Hisashi Iida ,  Toshihiro Suzumura ,  Toshio Kondo ,  Shigenori Isomura

IPC分类号： F02D41/00 ,  F02M25/08 ,  G01M19/00

CPC分类号： F02M25/0809

摘要： There is disclosed a self-diagnosis apparatus in which when detecting a supply abnormally (i.e., failure to lead fuel evaporation gas into an intake passage), the abnormality can be accurately detected, taking into consideration variations in the fuel gas density (variations in the ambient temperature, variations in the volatility of the fuel, and etc.) due to the residual air in a fuel tank. In the apparatus, the amount of flow of the gas from the fuel tank to a canister can be detected, and a control circuit controls a purge valve to close a fuel gas discharge passage, and in this condition the control circuit detects the amount of flow of the gas from the fuel tank to the canister. When this flow amount exceeds a set value, the control circuit controls the purge valve to close and open the discharge passage, and judges in accordance with a change in an air-fuel ratio detected at this time by an O.sub.2 sensor whether or not any abnormality exists. If the control circuit judges by this judgment that there exists abnormality, the set value of the gas flow amount is set to a value greater than said set value, and the abnormality judgment is again effected. Then, if this judgment result still indicates that abnormality exists, a warning lamp is turned on to give warning.

摘要翻译： 公开了一种自诊断装置，其中当异常地检测供应（即，不能将燃料蒸发气体引入进气通道时），可以精确地检测异常，考虑到燃料气体密度的变化（在 由于燃料箱中的残留空气，环境温度，燃料挥发性的变化等）。 在该装置中，可以检测从燃料箱到罐的气体流量，控制电路控制净化阀关闭燃料气体排出通路，在该状态下，控制电路检测出流量 从燃料箱到罐的气体。 当该流量超过设定值时，控制回路控制净化阀关闭并打开排出通道，并根据由此使用O 2传感器检测的空燃比的变化来判断是否有异常 存在 如果控制电路判断出存在异常，则将气体流量的设定值设定为大于设定值的值，再次进行异常判定。 然后，如果该判断结果仍然表示存在异常，则警告灯亮起，发出警告。