公开(公告)号：US06182498B2

公开(公告)日：2001-02-06

申请号：US09236336

申请日：1999-01-25

申请人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

发明人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

IPC分类号： G01N1910

CPC分类号： G01N27/4077

摘要： An oxygen sensor is disposed behind an exhaust gas purifying catalyst for an internal combustion engine and which suppresses the influence of unburnt hydrocarbon on the output voltage. A sensor element 1 is provided with a detection electrode 4 on the outer face of a zirconia ceramic body 2, a reference electrode 3 on the inner face of the ceramic body 2 and a spinel protective layer 5 on the outer surface of the detection electrode 4. The tip end of the sensor element 1 is covered with a protective cover 10 which is provided with an outer partition wall 11 having through holes 11a and an inner partition wall 12 having through holes 12a. In a case where the pressure difference between the inside and outside of the protective cover 10 is &Dgr;P(atm) when the atmospheric air with a volume flow rate Q(L/min) is passed into the protective cover 10 from the outside, the ratio &Dgr;P/Q2 is 3.2×10−5 (atm·min2·L−2). When the surface temperature of the sensor element 1 is changed in a range of sensor active temperature, the reversing time is substantially constant. Therefore, the catalyst deterioration can be detected by the oxygen sensor with high accuracy.

摘要翻译： 氧传感器设置在用于内燃机的废气净化催化剂的后面，并且抑制未燃烧的碳氢化合物对输出电压的影响。 传感器元件1在氧化锆陶瓷体2的外表面上设置有检测电极4，陶瓷体2的内表面上的参考电极3和检测电极4的外表面上的尖晶石保护层5 传感器元件1的前端用保护盖10覆盖，保护盖10设有具有通孔11a的外分隔壁11和具有通孔12a的内分隔壁12。 在体积流量Q（L / min）从外部进入保护罩10的大气中，保护罩10的内外压差为DELTAP（atm）的情况下， DELTAP / Q2为3.2×10-5（atm.min2.L-2）。 当传感器元件1的表面温度在传感器有效温度的范围内变化时，反转时间基本上是恒定的。 因此，可以通过氧传感器高精度地检测催化剂劣化。

公开(公告)号：US5983714A

公开(公告)日：1999-11-16

申请号：US137821

申请日：1998-08-21

申请人： Atsushi Izumiura ,  Akira Murakami ,  Atsushi Kato ,  Shigeo Hidai ,  Seiichi Hosogai

发明人： Atsushi Izumiura ,  Akira Murakami ,  Atsushi Kato ,  Shigeo Hidai ,  Seiichi Hosogai

IPC分类号： F02D19/02 ,  F02D41/22 ,  F02D45/00 ,  F02M21/02 ,  F02M65/00 ,  G01M15/00

CPC分类号： F02D19/027 ,  F02D19/025 ,  F02D41/222 ,  F02M65/00 ,  F02D2041/223 ,  F02M21/0239 ,  F02M21/0278 ,  Y02T10/32

摘要： A system for detecting failure of a fuel pressure sensor in an internal combustion engine, including an injector (32) provided at an intake system of the engine downstream of a throttle valve (38), a fuel supply passage (16) connected to a fuel supply source (fuel tank 12) for supplying fuel to the injector (32), pressure regulator (28) provided in the fuel supply passage (16) and operating to maintain a difference between the fuel pressure (PF2A) and the manifold absolute pressure at a constant value, a fuel pressure sensor (PF2 sensor 54) for detecting the fuel pressure (PF2A) in the fuel supply passage (16) downstream of the pressure regulator, and a manifold absolute pressure sensor (62) for detecting the manifold absolute pressure (PBA) downstream of the throttle valve (38). In the system, an index indicative of a ratio (.DELTA.PF2A) of the fuel pressure (PF2A) fluctuation relative to the manifold absolute pressure (PBA) fluctuation is compared to reference values (#PF2L, #PF2H) which define a range. Sensor failure is discriminated when the index (.DELTA.PF2A) is found to have remained outside of the range for a predetermined maximum time (tmP2STK). The system enables rapid and accurate detection of fuel pressure sensor abnormality (failure).

摘要翻译： 一种用于检测内燃机中的燃料压力传感器的故障的系统，包括设置在节流阀（38）下游的发动机的进气系统处的喷射器（32），与燃料连接的燃料供给通道 用于向喷射器（32）供应燃料的供应源（燃料箱12），设置在燃料供应通道（16）中的压力调节器（28），并且操作以维持燃料压力（PF2A）与歧管绝对压力之间的差 用于检测压力调节器下游的燃料供给通道（16）中的燃料压力（PF2A）的燃料压力传感器（PF2传感器54）和用于检测歧管绝对压力的歧管绝对压力传感器（62） （PBA）在节流阀（38）的下游。 在该系统中，将指示相对于歧管绝对压力（PBA）波动的燃料压力（PF2A）波动的比率（DELTA PF2A）的指标与限定范围的参考值（＃PF2L，＃PF2H）进行比较。 当发现索引（DELTA PF2A）已经保持在预定最大时间（tmP2STK）的范围之外时，会识别传感器故障。 该系统能够快速，准确地检测燃油压力传感器异常（故障）。

公开(公告)号：US06210552B1

公开(公告)日：2001-04-03

申请号：US09199319

申请日：1998-11-25

申请人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Isomura ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

发明人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Isomura ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

IPC分类号： G01N27407

CPC分类号： G01N27/4071

摘要： There is disclosed an oxygen sensor disposed before an exhaust gas purifying catalyst of an engine which uses a hydrocarbon containing fuel with a H/C ratio of three or more. An oxygen sensor 1 is provided with a solid electrolytic body 2 which can generate a difference in oxygen concentration with reference gas and measured gas, a reference electrode 3 and a detection electrode 4 formed on inner and outer surfaces of the solid electrolytic body 2, and a porous protective layer 5 for covering the detection electrode 4. The detection electrode 4 is formed only of a metal like Pt which promotes oxidizing reaction of methane to have a thickness of 1 to 2 &mgr;m. In the protective layer 5, only a second protective layer 5b carries Pt catalyst 6 which promotes oxidizing reaction of hydrogen, and the amount of carried catalyst is in the range of 0.5 to 7 mol % relative to the whole of the second protective layer 5b. According to the oxygen sensor 1, even if a large amount of hydrogen is exhausted, for example, from CNG engine, or even if a large amount of methane is exhausted, an excellent engine control can be realized.

摘要翻译： 公开了使用H / C比为3以上的烃类燃料的发动机的排气净化催化剂之前设置的氧传感器。 氧传感器1设置有固体电解体2，其可以产生与参考气体和测量气体的氧浓度差，形成在固体电解体2的内表面和外表面上的参考电极3和检测电极4，以及 用于覆盖检测电极4的多孔保护层5.检测电极4仅由促进甲烷的氧化反应的具有1〜2μm厚度的金属Pt形成。 在保护层5中，仅第二保护层5b携带促进氢的氧化反应的Pt催化剂6，并且所携带的催化剂的量相对于整个第二保护层5b为0.5〜7摩尔％。 根据氧传感器1，即使例如从CNG发动机排出大量的氢，即使大量的甲烷被排出，也能够实现良好的发动机控制。

公开(公告)号：US06176080B1

公开(公告)日：2001-01-23

申请号：US09150207

申请日：1998-09-09

申请人： Atsushi Izumiura ,  Akira Murakami ,  Hirohisa Kitaura ,  Seiichi Hosogai ,  Shigeo Hidai

发明人： Atsushi Izumiura ,  Akira Murakami ,  Hirohisa Kitaura ,  Seiichi Hosogai ,  Shigeo Hidai

IPC分类号： F01N300

CPC分类号： F02D41/1495 ,  F02D41/1441 ,  F02D41/1454

摘要： An oxygen concentration sensor abnormality-detecting system is provided for an internal combustion engine having first and second oxygen concentration sensors arranged in the exhaust system upstream and downstream of a catalytic converter therein. An ECU determines that the first oxygen concentration sensor is functioning abnormally if an output from the first oxygen concentration sensor does not change when an output from the second oxygen concentration sensor changes.

摘要翻译： 本发明提供一种用于内燃机的氧浓度传感器异常检测系统，该内燃机具有布置在排气系统中的催化转化器上游和下游的第一和第二氧浓度传感器。 如果来自第一氧浓度传感器的输出在来自第二氧浓度传感器的输出变化时，ECU判定第一氧浓度传感器功能异常。

公开(公告)号：US06679982B1

公开(公告)日：2004-01-20

申请号：US09671591

申请日：2000-09-28

申请人： Hiroshi Matsuzaki ,  Keiji Suzuki ,  Teppei Ookawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita ,  Katsunori Nakamura

发明人： Hiroshi Matsuzaki ,  Keiji Suzuki ,  Teppei Ookawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita ,  Katsunori Nakamura

IPC分类号： G01N27407

CPC分类号： G01N27/407

摘要： An oxygen sensor is disposed downstream from a catalyst for purifying exhaust gas from an internal combustion engine and which can suppress an influence of unburnt hydrocarbon on an output voltage. After forming a platinum thin film on the outer periphery of a zirconia ceramic body, only a detection electrode of the ceramic body is dipped in a silver nitrate aqueous solution of 0.1 mol/l, and the silver nitrate is pyrolyzed through a heat treatment. Subsequently, a platinum reference electrode is formed on the inner periphery of the ceramic body. To protect the silver-doped detection electrode, a protective layer is formed on the surface of the detection electrode. By the exposure to combustion gas and through aging, a detection element is formed, and set into a metal case together with a cylindrical heater, to complete an oxygen sensor to be disposed downstream from a CNG engine catalyst.

摘要翻译： 氧传感器设置在用于净化来自内燃机的废气的催化剂的下游，并且能够抑制未燃烧的碳氢化合物对输出电压的影响。 在氧化锆陶瓷体的外周形成铂薄膜后，仅将陶瓷体的检测电极浸渍在0.1mol / l的硝酸银水溶液中，并通过热处理热解硝酸银。 随后，在陶瓷体的内周上形成铂参考电极。 为了保护银掺杂检测电极，在检测电极的表面上形成保护层。 通过暴露于燃烧气体并通过老化，形成检测元件，并与圆柱形加热器一起设置为金属壳体，以完成将氧传感器设置在CNG发动机催化剂的下游。

公开(公告)号：US5941212A

公开(公告)日：1999-08-24

申请号：US150208

申请日：1998-09-09

申请人： Akira Murakami ,  Seiichi Hosogai ,  Shigeo Hidai ,  Eisaku Gosho

发明人： Akira Murakami ,  Seiichi Hosogai ,  Shigeo Hidai ,  Eisaku Gosho

IPC分类号： F02D41/04 ,  F02D41/10 ,  F02D41/12 ,  F02D41/14

CPC分类号： F02D41/1487 ,  F02D41/123 ,  F02D2200/0406 ,  F02D2200/0414 ,  F02D2200/501

摘要： An air-fuel ratio control system for an internal combustion engine includes an ECU which cuts off fuel supply to the engine at deceleration thereof, measures a fuel cut-off period over which the fuel cut-off means cuts off fuel supply to the engine, and enriches the air-fuel ratio of a mixture supplied to the engine to a degree dependent upon the measured fuel cut-off period, at the restart of fuel supply to the engine immediately after termination of cutting-off of fuel supply to the engine. When a second cutting-off of fuel supply to the engine is carried out within a predetermined time period after the restart of fuel supply to the engine immediately after termination of a first cutting-off of fuel supply to the engine, the ECU sets the degree of enriching the air-fuel ratio of the mixture supplied to the engine according to the sum of a first fuel cut-off period over which the first cutting-off of fuel supply to the engine lasted and a second fuel cut-off period over which the second cutting-off of fuel supply to the engine lasted.

摘要翻译： 用于内燃机的空燃比控制系统包括：ECU，其在减速时切断对发动机的燃料供给，测量燃料切断期间燃料切断装置切断对发动机的燃料供给， 并且在停止向发动机的燃料供给终止之后立即将供给到发动机的混合物的空燃比丰富到取决于测量的燃料截止周期的程度。 当在首次切断向发动机的燃料供给终止之后，在重新开始向发动机供给燃料之后的预定时间段内进行向发动机的燃料供给的第二切断时，ECU设定程度 根据第一燃料切断期间和发动机持续时间的第一燃料供给停止的第一燃料切断期和第二燃料切断期间的总和，提供供给发动机的混合物的空燃比， 向发动机提供燃油的第二次切断持续。