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41. 发明专利

JP2002357579A HUMIDIFY SENSOR 失效
公开(公告)号：JP2002357579A
公开(公告)日：2002-12-13
申请号：JP2001165318
申请日：2001-05-31
申请人： NGK SPARK PLUG CO
发明人： FUJITA HIROTERU , YAMADA TETSUO , ISHIDA NOBORU , OSHIMA TAKAFUMI
IPC分类号： G01N27/12
摘要： PROBLEM TO BE SOLVED: To provide a humidity sensor suppressing deterioration of a humidity sensitive layer and maintaining stable performance over a long period, even under an atmosphere to be measured contains toxic substances and a high temperature atmosphere. SOLUTION: The humidity sensor 1 is provided with an insulation substrate 11 comprising alumina, the humidity sensitive layer 13 having alumina, titania, tin oxide and the like with a prescribed mass ratio, a detection electrode (lower electrode 12 and upper electrode 14) comprising noble metal such as Pt and Au, and a protection layer 15 comprising metal oxide and composite oxide of either alumina, spinel or the like and is a porous body. The detection electrode can be the porous body, and the humidity sensitive layer is preferably the porous body. In addition, a heater 111 and a temperature measuring resistor 112 are provided in the inside of the insulation substrate, and is provided directly under the humidity sensitive layer in the inside of the insulation substrate.

42. 发明专利

JP2002310978A HYDROGEN SENSOR 失效
公开(公告)号：JP2002310978A
公开(公告)日：2002-10-23
申请号：JP2001113610
申请日：2001-04-12
申请人： NGK SPARK PLUG CO
发明人： NADANAMI NORIHIKO , KONDO TOMONORI , WATANABE MASAYA , INOUE TAKAHARU , ISHIDA NOBORU , OSHIMA TAKAFUMI
IPC分类号： G01N27/406 , G01N27/407 , G01N27/416 , G01N33/00 , H01M8/04
摘要： PROBLEM TO BE SOLVED: To provide a hydrogen sensor capable of accurately measuring the concentration of hydrogen gas in gas to be measured without being affected by methanol contained in the gas to be measured. SOLUTION: The hydrogen sensor has first and second electrodes 3 and 4 provided in contact with a proton conductive layer 2, a gas diffusion rate- limiting part 6 provided between a gas atmosphere to be measured and the first electrode 3 and supports (1a and 1b) for supporting the proton conductive layer 2, the first and second electrodes 3 and 4 and the gas diffusion rate- limiting part 6. The hydrogen gas in the gas to be measured introduced through the gas diffusion rate-limiting part 6 is dessociated, decomposed or reacted by applying voltage across the first and second electrodes 3 and 4, and the concentration of the hydrogen gas is calculated on the basis of a limit current generated by fundamentally pumping up the generated protons toward the second electrode 4 from the first electrode 3 through the proton conductive part 2. The concentration of hydrogen on the first electrode 3 is controlled to 10 atom or more in terms of hydrogen partial pressure.

43. 发明专利

JP2002243536A ULTRASONIC WAVE PROPAGATION TIME MEASURING METHOD AND GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2002243536A
公开(公告)日：2002-08-28
申请号：JP2001041680
申请日：2001-02-19
申请人： NGK SPARK PLUG CO
发明人： TOMONO KEIGO , ISHIKAWA HIDEKI , SATO YOSHIKUNI , ISHIDA NOBORU , OSHIMA TAKAFUMI
IPC分类号： G01N29/02 , F02D35/00 , F02D45/00 , G01H5/00 , G01N29/00 , G01N29/024 , G01N29/38 , G01N29/40 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide an ultrasonic wave propagation time measuring method and a gas concentration sensor capable of recognizing an accurate propagation time. SOLUTION: A received wave transmitted by an ultrasonic element 5 and received is subjected to full-wave rectification, and integrated by an integration circuit 37, and a peak value is retained in a peak hold circuit 39. As for detection of gas concentration, a determination value is set based on the peak value in a threshold level calculation part 21e, and the time when a comparator 43 determines that the amplitude of the received wave subjected to the full-wave rectification reaches a set value is used as an arrival time, and the gas concentration is detected based on a period from the transmission time to the arrival time.

44. 发明专利

JP2002031621A GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2002031621A
公开(公告)日：2002-01-31
申请号：JP2000214219
申请日：2000-07-14
申请人： NGK SPARK PLUG CO
发明人： ISHIKAWA HIDEKI , SATO YOSHIKUNI , TOMONO KEIGO , ISHIDA NOBORU , OSHIMA TAKAFUMI
IPC分类号： G01N29/02 , G01N29/00 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide a gas concentration sensor which has a good responsivity for measuring a gas concentration at a measuring object or a measuring point having a relatively large channel. SOLUTION: A measuring pipe 21 of this gas concentration sensor 20 is set at least partly inside the channel, so that a gas to be measured can be directly sent into a measuring chamber 22 via an inlet hole 21a and an outlet hole 21b. The gas concentration sensor is accordingly superior in responsivity. Since the measuring chamber 22 is arranged in the channel, the need of additionally setting a projecting pipe for introducing the gas to be measured, etc., is eliminated, and the gas concentration sensor itself can be made more compact.

45. 发明专利

JP2001355521A FAILURE DIAGNOSING SYSTEM FOR GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2001355521A
公开(公告)日：2001-12-26
申请号：JP2000175123
申请日：2000-06-12
申请人： NGK SPARK PLUG CO
发明人： SATO YOSHIKUNI , ISHIKAWA HIDEKI , TOMONO KEIGO , ISHIDA NOBORU
IPC分类号： F02M25/08 , F02D41/22 , F02D43/00 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To provide a failure diagnosing system for gas concentration sensor for detecting a failure when a gas concentration sensor provided in a purge line of an engine 1 failed. SOLUTION: In this failure diagnosing system, an ECU 22 measures the converging time from a start of the purge of an oxygen sensor 8 to be changed with the fluctuation of the air-fuel ratio, and compares this converging time with the target converging time Tsp decided on the basis of a load of an engine 1. In the case of the converging time T shorter than the target converging time Tsp, a gas concentration sensor 21 is considered normal, and on the other hand, in the case of the converging time T longer than the target converging time Tsp (=2.0 seconds), the gas concentration sensor 21 is considered failed. Even in the case, therefore, where the gas concentration sensor 21 itself can not determine a failure thereof, the system can diagnose a failure.

46. 发明专利

JP2001003820A METHOD AND APPARATUS FOR MEASURING AMOUNT OF EVAPORATED FUEL, METHOD AND APPARATUS FOR CONTROLLING AIR-FUEL RATIO, AND CANISTER 失效
公开(公告)号：JP2001003820A
公开(公告)日：2001-01-09
申请号：JP17303499
申请日：1999-06-18
申请人： NGK SPARK PLUG CO
发明人： SATO YOSHIKUNI , ISHIKAWA HIDEKI , TOMONO KEIGO , ISHIDA NOBORU
IPC分类号： F02M25/08 , F02D41/02 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To measure a supply amount of an evaporated fuel supplied into an intake pipe from a canister with high accuracy without using an ultrasonic sensor, and to properly control an air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine on the basis of a result of the measurement of the supply amount of the evaporated fuel. SOLUTION: A basic fuel injection time T0 and an air-fuel ratio correction coefficient KF are calculated (S10-S20) on the basis of signals from various sensors, and a flow rate Y of air flowing into a canister and a flow rate X of an air-fuel mixture flowing into an intake pipe are measured (S140, S150) when a purge valve is opened. Then a correction time Tp as a valve opening time of an injector corresponding to the supply amount of the evaporated fuel into the intake pipe is calculated (S160), on the basis of the difference between the flow rate X of the air-fuel mixture and the flow rate Y of the air. The basic fuel injection time T0 is corrected on the basis of the air-fuel ratio correction coefficient KF and the correction time Tp to calculate (S180) an optimum valve opening time T of the injector.

47. 发明专利

JP2000304732A GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2000304732A
公开(公告)日：2000-11-02
申请号：JP19802899
申请日：1999-07-12
申请人： NGK SPARK PLUG CO
发明人： ISHIKAWA HIDEKI , SATO YOSHIKUNI , TOMONO KEIGO , ISHIDA NOBORU , OSHIMA TAKAFUMI
IPC分类号： G01N29/00 , G01N29/02 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide a gas concentration sensor with which a gas concentration can be measured with high accuracy. SOLUTION: A recessed part 34a is formed so that the bottom face is to be nearly parallel to a reflecting face 34 in an edge part which comes into contact with the sidewall of a measuring chamber in the reflecting face 34. The distance between the edge part of the reflecting face 34 and an ultrasonic element 33 is made longer than the distance between the central part of the reflecting face 34 and the ultrasonic element 33. As a result, different-route waves which are propagated along the sidewall of the measuring chamber are reflected by the bottom face of the recessed part 34a so as to be propagated. That is to say, as compared with a case in which the reflecting face 34 is a plane, the propagation distance of the different-route waves becomes long, and the different-route waves are not synthesized near the modulation point of straight waves. That is to say, since the modulation point of the straight waves can be detected precisely, the time between the modulation point of transmitted waves and the modulation point of receives waves can be measured as the propagation time of ultrasonic waves, and a gas concentration can be measured with high accuracy.

48. 发明专利

JP2000241399A GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2000241399A
公开(公告)日：2000-09-08
申请号：JP4171699
申请日：1999-02-19
申请人： NGK SPARK PLUG CO
发明人： SATO YOSHIKUNI , ISHIKAWA HIDEKI , TOMONO KEIGO , ISHIDA NOBORU
IPC分类号： G01N29/02 , G01N29/00 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To obtain a gas concentration sensor which can be simply mounted to a suction pipe without requiring a mount place. SOLUTION: A gas concentration sensor 20 is constituted of a sensor case 21 as a sensor main body, and an insertion part 22 set projecting to a lower part of the sensor case 21. A setting hole 17 is formed to an intake manifold 4. In this case, it is necessary only to insert the insertion part 22 to the setting hole 15 and fix the sensor case 21 to the intake manifold 4 at the time of setting. The setting is accordingly simple and requires few parts. Since it is enough only to form the setting hole 15 to the intake manifold 4, working costs can be reduced. A large design change is eliminated from a suction pipe 2 including the manifold 4. Since the sensor can be set to any optional point if only the setting hole 15 is formed, a space for the setting can be saved.

49. 发明专利

JP2000206099A GAS CONCENTRATION SENSOR 失效
公开(公告)号：JP2000206099A
公开(公告)日：2000-07-28
申请号：JP428699
申请日：1999-01-11
申请人： NGK SPARK PLUG CO
发明人： SATO YOSHIKUNI , ISHIDA NOBORU , ISHIKAWA HIDEKI , OSHIMA TAKAFUMI , SATO YASUFUMI
IPC分类号： G01N29/02 , G01N29/00 , G01N29/024 , G01N29/40 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide a gas concn. sensor capable of measuring the concn. of gas with high accuracy. SOLUTION: Since the propagation time T1' of the first reflected wave (first reflected wave) of a deteriorated product becomes longer than the propagation time T1 of the first reflected wave of a new product, when the concn. of a specific gas is measured on the basis of the propagation time T1 of the first reflected wave of the new product, the concn. of the gas cannot be accurately detected. Since the reflected wave (e.g.; second reflected wave) after the first reflected wave is merely reflected from the surface of an ultrasonic element and not affected by the internal structure of the element, even if a sensor is deteriorated, the fluctuations of the propagation times T2, T2' thereof are reduced and the influence of deterioration is reduced. Then, the concn. of the specific gas is detected based on the propagation time of the second reflected wave hard to receive the influence of deterioration but not based on that of the first reflected wave easy to receive the influence of deterioration. By this constitution, the concn. of gas can be measured highly accurately.

50. 发明专利

JP2000155110A GAS SENSOR 失效
公开(公告)号：JP2000155110A
公开(公告)日：2000-06-06
申请号：JP25675399
申请日：1999-09-10
申请人： NGK SPARK PLUG CO
发明人： SUGAYA SATOSHI , ISHIDA NOBORU , NADANAMI NORIHIKO , YAMADA TETSUO , OSHIMA TAKAFUMI
IPC分类号： G01N27/419 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To provide a gas sensor equipped with an electrode for reducing the oxygen concentration dependence of the measurement of gas concn. SOLUTION: A first pump cell 6, equipped with first inner and outer electrodes 10, 11, is formed to face to the inside and outside of a first flow passage 2 and draw out/in oxygen from the first flow passage 2 through an oxygen ion conductor and a second pump cell 8 equipped with second inner and outer electrodes 14, 15 formed to face the inside and outside of the second flow passage 4 which communicates with the first flow passage with diffusion resistance and allowing current corresponding to the concn. of a gas component to be measured to flow across the electrodes 14, 15 through an oxygen ion conductor by the reaction of the gas component to be measured in the second flow passage 4 are provided. At least a part of the first inner electrode 10 contains a platinum group element and Cu and oxygen pumping capacity is high, the voltage applied across the first inner and outer electrodes 10, 11 is lowered, and the reaction of a gas to be measured in the first flow passage is suppressed and measurement accuracy is enhanced.

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