公开(公告)号：US06623618B1

公开(公告)日：2003-09-23

申请号：US09598811

申请日：2000-06-21

申请人： Nobuhide Kato ,  Yasuhiko Hamada ,  Nobuyuki Kokune

发明人： Nobuhide Kato ,  Yasuhiko Hamada ,  Nobuyuki Kokune

IPC分类号： G01N27407

CPC分类号： G01N27/419

摘要： Disclosed is a gas sensor for controlling a concentration of oxygen and/or measuring NOx by allowing a current to flow through an ion-conductive member for conducting oxygen ion, by the aid of a current supply circuit, wherein the current, which is outputted from the current supply circuit, has a pulse waveform (current signal) having a constant crest value, and the current supply circuit comprises a rectangular wave-generating circuit for controlling a frequency of the current signal on the basis of an electromotive force generated in the ion-conductive member to which the current signal is supplied. Accordingly, it is possible to highly accurately measure the predetermined gas component while scarcely being affected by the electric noise or the like.

摘要翻译： 公开了一种气体传感器，用于通过允许电流通过用于导电氧离子的离子传导构件流过氧气浓度和/或测量NOx的气体传感器，借助于电流供应电路，其中从 电流供应电路具有恒定波峰值的脉冲波形（电流信号），并且电流供应电路包括矩形波发生电路，用于基于在离子中产生的电动势来控制电流信号的频率 电流信号被供给到该导电构件。 因此，可以高度精确地测量预定的气体成分，同时几乎不受电噪声等的影响。

公开(公告)号：US06527929B2

公开(公告)日：2003-03-04

申请号：US10021196

申请日：2001-10-30

申请人： Nobuhide Kato ,  Kunihiko Nakagaki

发明人： Nobuhide Kato ,  Kunihiko Nakagaki

IPC分类号： G01N27407

CPC分类号： G01N27/4072 ,  G01N27/417 ,  G01N27/419

摘要： A gas sensor for measuring an amount of a measurement gas component, including a solid electrolyte having an internal space, a gas-introducing port for introducing measurement gas from an external space into the internal space, diffusion rate-determining means between the internal space and the gas-introducing port, and inner and outer pumping electrodes for pumping-processing oxygen contained in the measurement gas. The diffusion rate-determining means includes slits each having, when viewed in a plane substantially perpendicular to a longitudinal extension axis thereof, two dimensions, with at least one dimension of each slit being not more than 10 microns.

公开(公告)号：US06482650B1

公开(公告)日：2002-11-19

申请号：US09257058

申请日：1999-02-25

申请人： Nobuhide Kato ,  Nobukazu Ikoma ,  Satoshi Nishikawa ,  Takeya Miyashita

发明人： Nobuhide Kato ,  Nobukazu Ikoma ,  Satoshi Nishikawa ,  Takeya Miyashita

IPC分类号： G01N3110

CPC分类号： F01N11/00 ,  F01N11/002 ,  F01N13/009 ,  F01N2550/02 ,  G01N27/16 ,  Y02T10/47 ,  Y10T436/21 ,  Y10T436/218

摘要： One of a pair of temperature sensor sections in a combustible gas sensor is covered with porous oxidizing catalytic layers (23, 24) for oxidizing a combustible gas, and the other is not covered with the oxidizing catalyst layers. The temperature sensor sections each have temperature sensitive portions (13, 14) made of a dense ceramic material, resistors (21, 22) buried therein and having a positive resistance temperature coefficient, current leads (31, 32, 41, 42) and voltage leads (33, 34, 43, 44). A method for detecting the deterioration of a catalyst which intends to eliminate the combustible gas, by the use of this combustible gas sensor is further disclosed. When a difference between temperatures of the pair of resistors or a difference between powers fed to the pair of resistors is in excess of a predetermined value, it is judged that the catalyst has been deteriorated.

摘要翻译： 可燃气体传感器中的一对温度传感器部分之一被用于氧化可燃气体的多孔氧化催化剂层（23,24）覆盖，另一个不被氧化催化剂层覆盖。 温度传感器部分各自具有由致密陶瓷材料制成的温度敏感部分（13,14），埋入其中的电阻器（21,22）并具有正电阻温度系数，电流引线（31,32,31,42）和电压 引线（33,34,43,44）。 进一步公开了一种通过使用该可燃气体传感器来检测旨在消除可燃气体的催化剂劣化的方法。 当一对电阻器的温度差或馈送到一对电阻器的功率之间的差异超过预定值时，判断催化剂已劣化。

公开(公告)号：US06455009B1

公开(公告)日：2002-09-24

申请号：US09318835

申请日：1999-05-26

申请人： Nobuhide Kato ,  Hiroshi Kurachi

发明人： Nobuhide Kato ,  Hiroshi Kurachi

IPC分类号： G05D700

CPC分类号： B01D53/8696 ,  B01D53/56 ,  B01D53/9495 ,  B01D2251/2062 ,  B01D2251/2067 ,  F01N3/206 ,  F01N2610/02 ,  Y02T10/24 ,  Y10S423/05

摘要： An NOx removal system has a combustion apparatus for applying energy to a load based on a predetermined combustion control process, an NOx remover for reacting NOx emitted from the combustion apparatus with NH3 to produce N2 and H2O, an NH3 and/or urea introducing apparatus connected upstream of the NOx remover, for introducing NH3 and/or urea into a gas passage extending from the combustion apparatus to the NOx remover, and sensor, which is also sensitive connected downstream of the NOx remover, for generating a detected signal based on NH3 and NOx contained in a gas discharged from the NOx remover. A controller controls a rate at which NH3 and/or urea is introduced into the gas passage by the NH3 and/or urea introducing apparatus while repeatedly increasing and reducing the rate, in response to the detected signal generated by the NOx sensor. The NOx removal system, which employs NH3 and/or urea as a reducing agent, is capable of accurately controlling the rate at which NH3 and/or urea is introduced into the gas passage through a simple arrangement, and minimizing the discharge of NH3 and NOx.

摘要翻译： NOx去除系统具有用于基于预定的燃烧控制过程向负载施加能量的燃烧装置，用于使从燃烧装置发射的NOx与NH 3反应以产生N 2和H 2 O的NOx去除剂，连接的NH 3和/或尿素引入装置 用于将NH 3和/或尿素引入到从燃烧装置延伸到NOx去除器的气体通道中，以及也在NOx去除器的下游敏感的传感器，用于产生基于NH 3的检测信号，以及 从NOx去除剂排出的气体中含有的NOx。 控制器控制NH 3和/或尿素通过NH 3和/或尿素引入装置引入到气体通道中的速率，同时响应于由NOx传感器产生的检测信号而重复地增加和降低速率。 使用NH 3和/或尿素作为还原剂的NOx去除系统能够通过简单的布置精确地控制将NH 3和/或尿素引入气体通道的速率，并且使NH 3和NO x的排放最小化 。

公开(公告)号：US06196053B1

公开(公告)日：2001-03-06

申请号：US09565401

申请日：2000-05-05

申请人： Nobuhide Kato ,  Kunihiko Nakagaki

发明人： Nobuhide Kato ,  Kunihiko Nakagaki

IPC分类号： G01N2741

CPC分类号： G01N27/419 ,  F02D2041/1468 ,  G01N27/4074

摘要： A method and a sensing device of measuring a concentration of a gas component of a measurement gas, which method includes the steps of: introducing the measurement gas containing the gas component, from an external measurement-gas space into a first internal space, under a diffusion resistance; controlling an amount of oxygen in the measurement gas within the first internal space, so as to produce an atmosphere which does not substantially affect measurement of the gas component and which does not convert the gas component; introducing the atmosphere from the first internal space into a second internal space, under a diffusion resistance; and measuring the concentration of the gas component present in the atmosphere in the second internal space.

摘要翻译： 一种测量测量气体的气体成分浓度的方法和检测装置，该方法包括以下步骤：将含有气体成分的测量气体从外部测量气体空间引入第一内部空间， 扩散阻力; 控制第一内部空间内的测量气体中的氧气量，以产生实质上不影响气体成分测量且不转化气体组分的气氛; 将气氛从第一内部空间引入第二内部空间，在扩散阻力下; 并且测量存在于第二内部空间中的气氛中的气体成分的浓度。

公开(公告)号：US06134883A

公开(公告)日：2000-10-24

申请号：US456885

申请日：1999-12-08

申请人： Nobuhide Kato ,  Hiroshi Kurachi

发明人： Nobuhide Kato ,  Hiroshi Kurachi

IPC分类号： G01N27/27 ,  B01D53/86 ,  B01D53/94 ,  F01N3/08 ,  F01N3/20 ,  F01N3/28 ,  F01N11/00 ,  F02B1/04 ,  F02D41/02 ,  F02D41/04 ,  F02D41/14 ,  G01N27/00 ,  G01N27/26 ,  G01N27/416

CPC分类号： F02D41/146 ,  B01D53/9431 ,  B01D53/9495 ,  F01N11/00 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F02D41/0275 ,  F02D41/1441 ,  F02D41/1463 ,  F01N2250/12 ,  F01N2430/06 ,  F01N2550/02 ,  F01N2550/03 ,  F01N2610/03 ,  F02B1/04 ,  Y02T10/24 ,  Y02T10/47

摘要： In a method of controlling an exhaust gas system of an internal combustion engine including a nitrogen oxide reducing catalyst capable of adsorbing nitrogen oxide under a lean atmosphere and a nitrogen oxide sensor disposed downstream of the nitrogen oxide reducing catalyst, the nitrogen oxide reducing catalyst and the nitrogen oxide sensor are disposed in the exhaust gas system operated mainly under a lean condition, respectively. An output value of the nitrogen oxide sensor is compared with a predetermined value, and an operation condition of the internal combustion engine is temporarily changed into a stoichiometric condition or a rich condition, or a fuel is injected upstream of the nitrogen oxide reducing catalyst, so that the nitrogen oxide adsorbed to the nitrogen oxide reducing catalyst is detached or decomposed, and again the internal combustion engine is operated under the lean condition. Deterioration of the catalyst is determined based on Nox amount which is calculated from the sensor output, exhaust has flow amount and vehicle running distance.

摘要翻译： 在含有能够在贫气氛下吸附氮氧化物的氮氧化物还原催化剂和配置在氮氧化物还原催化剂下游的氮氧化物传感器的内燃机的排气系统的控制方法中，所述氮氧化物还原催化剂和 氮氧化物传感器分别设置在主要在稀薄状态下操作的排气系统中。 将氮氧化物传感器的输出值与规定值进行比较，将内燃机的运转状态暂时变为化学计量条件或浓气条件，或在氮氧化物还原催化剂的上游注入燃料，因此 吸附到氮氧化物还原催化剂上的氮氧化物被分离或分解，并且再次在内燃机在稀薄条件下运行。 基于由传感器输出计算的Nox量，排气具有流量和车辆行驶距离来确定催化剂的劣化。

公开(公告)号：US6059947A

公开(公告)日：2000-05-09

申请号：US098597

申请日：1998-06-17

申请人： Nobuhide Kato ,  Yasuhiko Hamada

发明人： Nobuhide Kato ,  Yasuhiko Hamada

IPC分类号： G01N27/26 ,  G01N27/407 ,  G01N27/416 ,  G01N27/417 ,  G01N27/419

CPC分类号： G01N27/419 ,  G01N27/4074 ,  G01N27/4175

摘要： A gas sensor comprises a main pumping cell for pumping-processing oxygen contained in a first chamber, a feedback control system for comparing a partial pressure of oxygen in the first chamber with a first reference value to control the main pumping cell so that the partial pressure of oxygen has a predetermined value at which NO is not decomposable, an auxiliary pumping cell for pumping-processing oxygen in the second chamber, and a measuring pumping cell for pumping-processing oxygen produced by decomposition of NOx. The gas sensor further comprises a correcting control system for correcting and controlling the feedback control system on the basis of a difference between a second reference value and a value of a pumping current flowing through the auxiliary pumping cell to give a constant oxygen concentration in the second chamber, and a self-diagnosis unit for comparing the value of the pumping current with a prescribed range and judging whether or not any trouble occurs, on the basis of an obtained result of comparison. Accordingly, it is possible to provide the gas sensor having a self-diagnosis function capable of quickly and reliably detecting whether or not any trouble occurs.

摘要翻译： 气体传感器包括用于泵送处理第一室中所含氧的主泵送单元，反馈控制系统，用于将第一室中的氧分压与第一参考值进行比较，以控制主泵浦单元，使得分压 的氧气具有不能分解NO的预定值，用于在第二室中泵送氧气的辅助泵浦单元，以及用于通过NOx分解产生的用于泵浦处理氧的测量泵浦单元。 气体传感器还包括校正控制系统，用于基于第二参考值和流过辅助泵送单元的泵浦电流的值之间的差来校正和控制反馈控制系统，以在第二参考值中提供恒定的氧浓度 以及用于将泵送电流的值与规定范围进行比较并根据获得的比较结果判断是否发生故障的自诊断单元。 因此，能够提供具有能够快速，可靠地检测是否发生故障的自诊断功能的气体传感器。

公开(公告)号：US06012282A

公开(公告)日：2000-01-11

申请号：US876396

申请日：1997-06-16

申请人： Nobuhide Kato ,  Hiroshi Kurachi

发明人： Nobuhide Kato ,  Hiroshi Kurachi

IPC分类号： G01N27/26 ,  B01D53/94 ,  F01N11/00 ,  F02D41/14 ,  F02D45/00 ,  G01N27/416 ,  G01N27/417 ,  F01N3/00

CPC分类号： G01N27/4175 ,  B01D53/9495 ,  F01N11/00 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/146 ,  F02D41/1495 ,  G01N27/417 ,  F01N2550/02 ,  F01N2560/026 ,  F02D2250/36 ,  F02D41/1479 ,  Y02T10/22 ,  Y02T10/47

摘要： A method for controlling an engine exhaust gas system includes the steps of detecting an air-fuel ratio of exhaust gas discharged from an internal engine by an oxygen sensor, controlling the exhaust gas to near the stoichiometric air-fuel ratio by a closed-loop control referring to a resultant signal, and leading the exhaust gas to a three-way catalyst to treat nitrogen oxide, hydrocarbon and carbon monoxide. A nitrogen oxide sensor is provided downstream of the three-way catalyst, and a control value of air-fuel ratio by a closed loop control by the oxygen sensor is corrected to set the nitrogen oxide concentration to a predetermined value in accordance with an output of the nitrogen oxide sensor. The deterioration of the three-way catalyst and/or oxygen sensor is detected by comparing a change in control corrected value for the air-fuel ratio of closed loop control referring to an output of the nitrogen oxide sensor with a predetermined value.

摘要翻译： 一种用于控制发动机排气系统的方法包括以下步骤：通过氧传感器检测从内部发动机排出的废气的空燃比，通过闭环控制将废气控制到接近化学计量空燃比 指出得到的信号，并将废气引导至三元催化剂以处理氮氧化物，烃和一氧化碳。 在三元催化剂的下游设置有氮氧化物传感器，并且通过氧传感器的闭环控制对空燃比的控制值进行校正，以将氮氧化物浓度设定为规定值， 氮氧化物传感器。 通过将参照氮氧化物传感器的输出的闭环控制的空燃比的控制校正值的变化与预定值进行比较来检测三元催化剂和/或氧传感器的劣化。

公开(公告)号：US5942190A

公开(公告)日：1999-08-24

申请号：US802280

申请日：1997-02-19

申请人： Nobuhide Kato ,  Kunihiko Nakagaki

发明人： Nobuhide Kato ,  Kunihiko Nakagaki

IPC分类号： G01N27/407 ,  G01N27/416 ,  G01N27/419 ,  G01N27/41

CPC分类号： G01N27/4074 ,  G01N27/419 ,  Y10T436/177692 ,  Y10T436/179228

摘要： Disclosed is an oxide sensor in which a measuring electrode is arranged at a distance d to satisfy -3t.ltoreq.d.ltoreq.3t for a downstream end of an inner pumping electrode for a first chamber, i.e., the end located on a side of a second diffusion rate-determining section, provided that d represents a distance between the measuring electrode and the downstream end in a positive direction directed from the first chamber to a second chamber, and t represents a height of the first chamber. A partial pressure of oxygen in the first chamber is measured by using the measuring electrode. A main pumping cell is subjected to feedback control on the basis of a measured value so that the partial pressure of oxygen in the first chamber is controlled. After that, a measurement gas is introduced into the second chamber. Oxides contained in the measurement gas are decomposed by the aid of a detecting electrode or a catalyst. A partial pressure of oxygen produced by the decomposition is measured to determine the concentration of the oxides. Accordingly, it is possible to measure the oxides contained in the measurement gas with an extremely high degree of accuracy. Moreover, the obtainable oxide sensor is compact and inexpensive.

摘要翻译： 公开了一种氧化物传感器，其中，对于第一室的内部泵送电极的下游端，即位于一侧的端部，距离d设置测量电极以满足-3t≤d≤3t 第二扩散速率确定部分，其中d表示测量电极和从第一室指向第二室的正方向上的下游端之间的距离，t表示第一室的高度。 通过使用测量电极测量第一室中的氧的分压。 基于测量值对主泵送单元进行反馈控制，从而控制第一室中的氧分压。 之后，将测量气体引入第二室。 包含在测量气体中的氧化物通过检测电极或催化剂分解。 测量分解产生的氧分压，以确定氧化物的浓度。 因此，能够以极高的精度测定测定气体中所含的氧化物。 此外，可获得的氧化物传感器是紧凑且便宜的。

公开(公告)号：US5922287A

公开(公告)日：1999-07-13

申请号：US667794

申请日：1996-06-21

申请人： Nobuhide Kato ,  Nobukazu Ikoma ,  Satoshi Nishikawa ,  Takeya Miyashita

发明人： Nobuhide Kato ,  Nobukazu Ikoma ,  Satoshi Nishikawa ,  Takeya Miyashita

IPC分类号： G01N25/30 ,  F01N11/00 ,  F01N13/02 ,  G01N27/16 ,  G01N31/12

CPC分类号： F01N11/00 ,  F01N11/002 ,  F01N13/009 ,  G01N27/16 ,  F01N2550/02 ,  Y02T10/47 ,  Y10T436/21 ,  Y10T436/218

摘要： A combustible gas sensor having a pair of temperature sensor sections is here disclosed. One of the pair of temperature sensor sections is covered with porous oxidizing catalytic layers (23, 24) for oxidizing a combustible gas, and the other is not covered with the oxidizing catalyst layers. In the one temperature sensor section, the combustible gas is burned, and in the other temperature sensor section, the temperature of a gas to be measured is compensated. The temperature sensor sections each comprises temperature sensitive portions (13, 14) made of a dense ceramic material, resistors (21, 22) buried therein and having a positive resistance temperature coefficient, current leads (31, 32, 41, 42) and voltage leads (33, 34, 43, 44). A method for measuring the concentration of the combustible gas by the use of this combustible gas sensor is also disclosed. A method for detecting the deterioration of a catalyst which intends to eliminate the combustible gas, by the use of this combustible gas sensor is further disclosed. When a difference between temperatures of the pair of resistors or a difference between powers fed to the pair of resistors is in excess of a predetermined value, it is judged that the catalyst has been deteriorated.

摘要翻译： 这里公开了具有一对温度传感器部的可燃气体传感器。 一对温度传感器部分中的一个被用于氧化可燃气体的多孔氧化催化剂层（23,24）覆盖，另一个不被氧化催化剂层覆盖。 在一个温度传感器部分中，可燃气体被燃烧，并且在另一个温度传感器部分中补偿要测量的气体的温度。 温度传感器部分各自包括由致密陶瓷材料制成的温度敏感部分（13,14），埋入其中并具有正电阻温度系数的电阻器（21,22），电流引线（31,32,31,42）和电压 引线（33,34,43,44）。 还公开了通过使用该可燃气体传感器来测量可燃气体的浓度的方法。 进一步公开了一种通过使用该可燃气体传感器来检测旨在消除可燃气体的催化剂劣化的方法。 当一对电阻器的温度差或馈送到一对电阻器的功率之间的差异超过预定值时，判断催化剂已劣化。