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21. 发明专利

JP2002115534A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2002115534A
公开(公告)日：2002-04-19
申请号：JP2000312227
申请日：2000-10-12
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： KITAHARA YUICHI , KURODA OSAMU , SHINOZUKA NORIHIRO , HIRATSUKA TOSHIFUMI , OKUDE KOJIRO , INOUE TAKESHI , DOI RYOTA
IPC分类号： F01N3/10 , B01D53/94 , B01J23/58 , B01J23/63 , F01N3/08 , F01N3/28
摘要： PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of simplifying the structure of a processing apparatus and effectively-removing a harmful component such as NOx from lean-burn exhaust gas of an internal combustion engine or effectively-making it harmless. SOLUTION: This exhaust emission control device for internal combustion engine includes an NOx catalyst capturing NOx when there is more oxidizing agent than a reducing agent, relative to an oxidation-reduction stoichiometric ratio between respective components in the exhaust gas, in the exhaust emission passage of the engine and subjecting the NOx which has been captured in a catalytic reduction when there is a reducing agent equal to or more than an oxidizing agent, having the function of allowing the NOx to be captured on the NOx catalyst when there is more oxidizing agent than the reducing agent, relative to the oxidation-reduction stoichiometric ratio and, when there is a reducing agent equal to or more than an oxidizing agent, subjecting the NOx which has been captured on the NOx catalyst to a catalytic reaction for reduction into N2, thereby making it harmless. Part of the NOx catalyst is formed into a three way catalyst.

22. 发明专利

JP2001263049A EXHAUST EMISSION CONTROL DEVICE 失效
公开(公告)号：JP2001263049A
公开(公告)日：2001-09-26
申请号：JP2000081724
申请日：2000-03-17
申请人： HITACHI LTD
发明人： IIZUKA HIDEHIRO , OKUDE KOJIRO , KANAE MASAHITO , YAMASHITA HISAO
IPC分类号： F02B43/00 , B01D53/94 , B01J23/68 , F01N3/22 , F01N3/28 , F02M21/02
摘要： PROBLEM TO BE SOLVED: To provide a method and a device for efficiently purifying NOx, HC, and CO in an exhaust gas from a gas engine. SOLUTION: In this device for purifying hydrocarbon, carbon monoxide, and NOx in the exhaust gas of the gas engine driven with not more than stoichiometric air fuel ratio, an NOx purification catalyst, an oxygen addition device, and an oxidation catalyst are sequentially provided in an exhaust passage, NOx in the exhaust gas is reduced and purified by the NOx purification catalyst, oxygen concentration within the exhaust gas after contact to the NOx purification catalyst is increased by the oxygen addition device, hydrocarbon and carbon monoxide in the exhaust gas are oxidized and purified by the oxidation catalyst.

23. 发明专利

JP2001248428A EXHAUST EMISSION CONTROL DEVICE AND EXHAUST EMISSION CONTROL METHOD 失效
公开(公告)号：JP2001248428A
公开(公告)日：2001-09-14
申请号：JP2000054961
申请日：2000-02-29
申请人： HITACHI LTD
发明人： IIZUKA HIDEHIRO , OKUDE KOJIRO , KANAE MASAHITO , NAGAYAMA KOUSEI , YAMASHITA HISAO , KITAHARA YUICHI , KURODA OSAMU
IPC分类号： F02D43/00 , F01N3/08 , F01N3/20 , F01N3/24 , F01N3/28 , F02D41/06
摘要： PROBLEM TO BE SOLVED: To expedite HC purification when staring an engine. SOLUTION: A low temperature CO.H2.NOX capturing material 31 is disposed on the upstream side of a HC oxidation catalyst or a three-way catalyst 30. The low temperature CO.H2.NOX capturing material 31 removes at least one of CO, H2 and NOX in exhaust gas without consuming oxygen. As a result, an oxygen concentration to oxidize HC relatively increases in the HC oxidation catalyst, and thereby, purification of HC is expedited.

24. 发明专利

JP2000314311A EXHAUST GAS EMISSION CONTROL METHOD, DEVICE AND CATALYST FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2000314311A
公开(公告)日：2000-11-14
申请号：JP12555099
申请日：1999-05-06
申请人： HITACHI LTD
发明人： IIZUKA HIDEHIRO , OKUDE KOJIRO , KANAE MASAHITO , YAMASHITA HISAO , DOI RYOTA , KURODA OSAMU , KITAHARA YUICHI
IPC分类号： B01D53/94 , B01J23/54 , B01J23/58 , B01J23/64 , F01N3/08 , F01N3/10 , F01N3/20 , F01N3/24 , F01N3/28
摘要： PROBLEM TO BE SOLVED: To improve durability of a repeatedly used a device which reduces and purifies NOx in exhaust gas while bringing a lean air-fuel ratio of exhaust gas and a rich air-fuel ratio of exhaust gas into alternate contact with an NOx purifying catalyst, by using a catalyst showing an absorption spectrum in a caught condition of NO2. SOLUTION: This internal combustion engine is operated such that an exhaust gas atmosphere is alternately subjected to an oxidized atmosphere and a reduced atmosphere, and NOx in exhaust gas is purified by an NOx purifying catalyst 18. In such an exhaust gas emission control method, a catalyst for showing the absorption spectrum of a captured condition of NO2 is used, when an NOx catching condition is measured by an infrared absorption spectrum (FT-IR). The NOx is captured on an NOx catching material surface as NO2, without taking NOx in the NOx catching material as a nitric acid compound. As a catalyst for use, a noble metal and a material having an NOx capturing material including alkali metal or alkali earth metal are preferable.

25. 发明专利

JP2000297633A EXHAUST EMISSION CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2000297633A
公开(公告)日：2000-10-24
申请号：JP10621499
申请日：1999-04-14
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： SHINOZUKA NORIHIRO , KURODA OSAMU , KITAHARA YUICHI , DOI RYOTA , INOUE TAKESHI , HIRATSUKA TOSHIFUMI , OKUDE KOJIRO
IPC分类号： B01D53/94 , F01N3/02 , F01N3/08 , F01N3/24 , F01N3/28
摘要： PROBLEM TO BE SOLVED: To efficiently generate high-temperature exhaust gas to achieve regeneration and rapid temperature rise of a lean NOx catalyst by providing a mechanism for collecting unburned components in exhaust gas upstream of a catalyst in an exhaust pipe of a lean burn engine, as well as providing a mechanism for combusting the collected unburned components. SOLUTION: An exhaust gas purifying catalyst 4 is provided in an exhaust tube 2 to detoxify components such particulates as, HC, CO, NOx contained in the exhaust gas emitted from a diesel engine 1. In this case, a DPF 3 for collecting unburned components, such as particulates in the exhaust gas, is provided in an exhaust tube 2 upstream of a catalyst 4. The DPF 3, made of a metal, causes heat to be generated through energizing and combusts particulates and other collected materials. Then, sensors 7 for detecting the exhaust gas temperature are set at the front and back of the DPF 3, and an engine control unit 5 controls to energize the DPF 3 based on these detected temperatures.

26. 发明专利

JPH11351021A CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH11351021A
公开(公告)日：1999-12-21
申请号：JP14423399
申请日：1999-05-25
申请人： HITACHI LTD
发明人： KURODA OSAMU , IIZUKA HIDEHIRO , DOI RYOTA , OGAWA TOSHIO , YAMASHITA HISAO , AZUHATA SHIGERU , OKUDE KOJIRO , KITAHARA YUICHI , HIRATSUKA TOSHIFUMI , SHINOZUKA NORIHIRO , MANAKA TOSHIO
IPC分类号： F01N3/08 , F01N3/20 , F01N3/24 , F01N3/28 , F02D41/04
摘要： PROBLEM TO BE SOLVED: To purify toxic component such as NOx from lean burn exhaust gas by estimating NOx exhaust amount during a lean operation by means of a control unit and by setting a fuel injection condition so as to maintain reducing agent whose amount is equal to or larger than that of oxidant when integrated value of the NOx exhaust amount exceeds a set value. SOLUTION: An exhaust gas purification system is provided with a NOx adsorption catalyst 18, and during stoichiometric operation its three way catalyst function purifies NOx, HC, CO in exhaust gas. During a lean operation, NOx adsorption function purifies NOx. In addition, during the lean operation, NOx purification ability of the NOx adsorption catalyst 18 is always judged. This judgment is derived by integrating NOx exhaust amount from each operation condition, and comparing the integrated value with the upper limit of adsorption amount. As a result, when the NOx purification ability decreases, air-fuel ratio of combustion is shifted to the rich side to recover the NOx adsorption ability of the absorption catalyst. Thus, the exhaust gas can be effectively purified under all engine combustion conditions.

27. 发明专利

JPH1010139A APPARATUS FOR MEASURING LIGHT PHYSICAL-PROPERTY OF MINUTE PART 失效
公开(公告)号：JPH1010139A
公开(公告)日：1998-01-16
申请号：JP16555896
申请日：1996-06-26
申请人： HITACHI LTD
发明人： KUWABARA MASASHI , OKUDE KOJIRO
IPC分类号： G01B11/30 , G01N37/00 , G01Q60/18
摘要： PROBLEM TO BE SOLVED: To identify a substance at an atomic level with good positional resolution, by injecting electrons to the substance from a probe of a scanning probe microscope and detecting a light emitted from the substance immediately below a front end of the probe. SOLUTION: A window 15 is formed of a transparent substance to light in order to take a light condensed by a concave mirror 8 out of an atmosphere bath 13. The light is condensed by the concave mirror 8 and at the same time turned to a parallel light, then taken out of the atmosphere bath 13 through the window 15. The light is reduced by a lens 6 and brought into a spectroscope 9. The light condensed by the concave mirror 8 is not directly brought into the spectroscope 9, but sent to the spectroscope after turned to the parallel light, because the light might be scattered or reflected and weakened in intensity unless the light were parallel to the Window 15 when taken out of the atmosphere bath 13. A driving mechanism moves an optical fiber 7 from outside of the atmosphere bath 13 to bring the fiber close to a front end of a probe 1. The apparatus can measure a surface shape of a sample 2, perform spectrometry and measure an emission intensity at the same time, so that a measurement time is shortened and influences by a heat drift are reduced.

28. 发明专利

JPH07333178A CATALYST EVALUATION METHOD 失效
公开(公告)号：JPH07333178A
公开(公告)日：1995-12-22
申请号：JP12853794
申请日：1994-06-10
申请人： HITACHI LTD
发明人： OKUDE KOJIRO
IPC分类号： G01N24/08 , B01J21/04 , B01J21/08 , B01J29/06
摘要： PURPOSE:To measure the solid nuclear magnetic resonance(NMR) spectrum of a suitable nuclide contained in a metallic oxide as a carrier, observe the line width of the spectrum due to the effect of a transition metal element on the carrier and easily evaluate catalyst activity via the change of the line width. CONSTITUTION:Signal line width is compared with the prescribed reference value of line width. Measured width, when equal to or larger than the reference value, is judged to be acceptable, and the width, when smaller than the reference value, is rejected, thereby evaluating catalyst activity. In this case, a material containing at least one of silicon 29 and aluminum 27 such as silica gel, alumina and zeolite can be mentioned as a particularly effective carrier for a metal carried catalyst. The solid NMR spectrum of at least one of the two nuclide is measured and a change in the observed signal line width is measured. Also, cobalt, copper and manganese can be enumerated in particular as useful carrier metals, and measurements are taken about a change appearing in the line breadth la and 2a of the solid NMR spectrum of nuclides contained in the organic solid metallic oxide of the carrier, in relation to the effect of a carrier metal.

29. 发明专利

JPH06235760A NUCLEAR MAGNETIC RESONATOR AND AUTOMATICALLY SETTING METHOD FOR MEASUREMENT CONDITION OF THE RESONATOR 失效
公开(公告)号：JPH06235760A
公开(公告)日：1994-08-23
申请号：JP2264393
申请日：1993-02-10
申请人： HITACHI LTD
发明人： OKUDE KOJIRO , MISAWA YUTAKA
IPC分类号： A61B5/055 , G01N24/00 , G01R33/28
摘要： PURPOSE:To obtain an NMR device with a means for achieving proper measurement conditions by automatically judging presence or absence of abnormalities such as deviation from a set value, inconveniences in automatic adjustment, and improper initial conditions and treatment on abnormality for at least one operation out of each type of operation needed for measurement including various kinds of device adjustments or setting of measurement conditions in NMR measurement. CONSTITUTION:The device is provided with a mechanism 6 for measuring data suited for controlling at least one operation out of each kind of operation needed for measurement including device adjustment such as sample rotation, magnetic field-frequency lock, and shim coil adjustment, a means 1 for judging the presence or absence of abnormality based on the data and controlling an operation mechanism 5 based on the result, a means 2 for inputting parameters and measurement conditions, a means 4 for storing parameters and algorithms, and a means 3 for reporting the state of occurrence of abnormality etc., to an operated as needed.

30. 发明专利

JP2004100659A Exhaust emission control device and exhaust emission purifying method for diesel engine 有权
公开(公告)号：JP2004100659A
公开(公告)日：2004-04-02
申请号：JP2002267534
申请日：2002-09-13
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IIZUKA HIDEHIRO , KAMIKAWA MASAYUKI , KANAE MASAHITO , OKUDE KOJIRO , HIGASHIYAMA KAZUHISA , KITAHARA YUICHI , KURODA OSAMU
IPC分类号： F01N3/02 , F01N3/08 , F01N3/24 , F01N3/28 , F01N3/36 , F02D41/38
摘要： PROBLEM TO BE SOLVED: To purify NOx included in diesel engine exhaust gas without providing a DPF to the upstream side of an exhaust gas purifying catalyst. SOLUTION: In this exhaust emission control device provided with the exhaust gas purifying catalyst in the exhaust channel of the diesel engine, an exhaust gas rectifying construction for branching exhaust gas into two or more in relation to the horizontal axial line of the exhaust channel is arranged on an exhaust upstream side rather than the exhaust gas purifying catalyst. An exhaust gas flow led to flow into the exhaust gas purifying catalyst is previously rectified in a laminar flow state by the exhaust gas rectifying construction, thereby collision frequency of fine particulates with the catalyst wall of the exhaust gas purifying catalyst is reduced, and adhesion of the particulates to the exhaust gas purifying catalyst is suppressed. Thereby, the performance deterioration of the exhaust gas purifying catalyst is suppressed. COPYRIGHT: (C)2004,JPO

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