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41. 发明专利

JP2001174297A FLOW RATE MEASURING METHOD AND DEVICE 失效
公开(公告)号：JP2001174297A
公开(公告)日：2001-06-29
申请号：JP36098099
申请日：1999-12-20
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , SUZUKI MAMORU , KOMAKI MICHINORI , KOBAYASHI KENCHI , TASHIRO TAKESHI , YUASA KENICHIRO
IPC分类号： G01F1/00 , G01F1/72 , G01F3/22 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To provide a gas flow rate measuring method and measuring device, capable of obtaining exact flow rate without mixing errors caused by a pulsation, even if it is caused in a gas flow and causing the increase of consumption power. SOLUTION: In a flow rate measuring device such as a gas flowmeter, gas pressure, in which consumption power is smaller than is necessary in measuring gas flow velocity, is often measured using a gas pressure measuring device 200, without having to increase the consumption power. Time differential P' per unit time of pressure value P in pulsation caused in the gas flow is obtained, and based on the pressure P' the error δv contained in the gas flow velocity v is calculated. With a measured error correction circuit 300, an error δv is added to or subtracted from a gas flow velocity v to correct the error in the gas flow velocity value v, and eventually a gas flow rate value with a small error is obtained.

42. 发明专利

JP3133617B2 失效
公开(公告)号：JP3133617B2
公开(公告)日：2001-02-13
申请号：JP19591494
申请日：1994-07-28
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04

43. 发明专利

JP2000304582A GAS SAFETY DEVICE 失效
公开(公告)号：JP2000304582A
公开(公告)日：2000-11-02
申请号：JP11327499
申请日：1999-04-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： UEDA YOSHIHIRO , NIIMURA NORIO , FUJII YASUSHI
IPC分类号： G01F3/22 , G01D3/028 , G01F1/66 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To accurately measure gas flow by confirming an unused status of gas with a shutoff valve in a gas passage closed to set a measurement value at this time at a zero point. SOLUTION: A drive circuit 6 for a shutoff valve 7 received a signal from a control circuit 4, closes the shutoff valve 7. The control circuit 4 monitors gas pressure on a downstream from a passage 2 with a pressure sensor 8 to judge that an no gas flows when the pressure is constant during a predetermined period. A zero-point of a gas safety device can be compensated by setting the gas pressure at this time as a zero point of gas flow measured with an ultrasonic sensor 1 in the case of gas unused in the control circuit 4. The zero-point is periodically compensated but can be done when the gas is not frequently used by a gas user by learning control. Also, leakage of gas piping or user of a gas appliance can be considered when the gas pressure on the downstream side rapidly drops during compensating the zero-point, and then the compensating zero-point is interrupted.

44. 发明专利

JP2000297691A ELECTRONIC PROCESSING SYSTEM AND RECORDING MEDIUM 失效
公开(公告)号：JP2000297691A
公开(公告)日：2000-10-24
申请号：JP10672999
申请日：1999-04-14
申请人： DENSO CORP
发明人： FUKUDA NORIO , TERAMURA MIKIO , KATO MASAYUKI , SAKATA HIDEAKI
IPC分类号： G01F1/68 , F02D45/00 , G01F1/696 , G01F15/04 , H03M1/12
摘要： PROBLEM TO BE SOLVED: To provide an electronic processing system and a recording medium that enables reduction of effects caused by variations of measured objects, without inducing problems such as an increase in load for software. SOLUTION: In allocating each channel to respective sensors for A/D conversion, remotest CH1 and CH24 from among consecutive channels are allocated to a VG sensor. In this case, the interval between CH1 and CH24 is set so that the interval becomes half the length of the cycle of a sensor voltage variation. Then, by activation of an A/D converter, the A/D conversion from CH1 through CH24 is performed in sequence (continuous processing of A/D conversion). By this arrangement, for example, first at a crest of sensor voltage the A/D conversion of CH1 of the VG sensor is performed, and then the A/D conversion of other channels, CH2-CH23, is performed in sequence. Finally, at a root of the sensor voltage, the A/D conversion of the CH24 of the VG sensor is performed again.

45. 发明专利

JP3040555B2 失效
公开(公告)号：JP3040555B2
公开(公告)日：2000-05-15
申请号：JP26197891
申请日：1991-10-09
IPC分类号： G01F1/50 , G01F15/02 , G01F15/04

46. 发明专利

JP2000018991A HEATER DRIVE CIRCUIT FOR FLOW-RATE MEASURING APPARATUS 失效
公开(公告)号：JP2000018991A
公开(公告)日：2000-01-21
申请号：JP18760798
申请日：1998-07-02
申请人： YAZAKI CORP
发明人： KIMURA OSAMU
IPC分类号： G01F1/68 , G01F1/699 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To obtain a heater drive circuit by which a temperature can be corrected with good accuracy, irrespective of an irregularity in a resistance value in the heater of a flow-rate sensor and irrespective of an irregularity in a characteristic regarding an element inside the circuit. SOLUTION: In a heater drive circuit 102 for a flow-rate measuring apparatus, a diode D1 as an ambinent-temperature monitoring element is provided, and a variable resistor VR1 which generates an offset voltage V2 is provided. An ambient-temperature monitoring voltage V1, at one end of the diode D1, which is changed according to an ambient temperature is added to the offset voltage V2. An added voltage V3 is amplified by an amplifier circuit in an operational amplifier AMP1 and by an amplifier circuit in an operational amplifier AMP2, so as to be adjusted, and a heater application voltage V4 is generated. The heater application voltage V4 is current-amplified via a transistor Tr1 so as to be supplied to a heater 111.

47. 发明专利

JPH11344369A FLOW-RATE DETECTING ELEMENT AND FLOW-RATE SENSOR 失效
公开(公告)号：JPH11344369A
公开(公告)日：1999-12-14
申请号：JP15490298
申请日：1998-06-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAWAI MASAHIRO , YAMAKAWA TOMOYA
IPC分类号： G01F1/68 , G01F1/69 , G01F1/692 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To obtain a flow-rate detecting element whose detecting accuracy is enhanced by preventing a detected temperature and a heating from becoming irregular due to a fluid to be measured and to the temperature distribution of a base material. SOLUTION: First temperature compensation resistance patterns 6a and second temperature compensation resistance patterns 6b are formed in the same position on the same face so as to overlap with each other. That is to say, the second temperature compensation resistance patterns 6b are formed between the first temperature compensation resistance patterns 6a, and the first temperature compensation resistance patterns 6a are formed between the second temperature compensation resistance patterns 6b.

48. 发明专利

JPH11325999A THERMAL FLOW SENSOR AND FLUID MEASURING METHOD 失效
公开(公告)号：JPH11325999A
公开(公告)日：1999-11-26
申请号：JP13328298
申请日：1998-05-15
申请人： RICOH KK , RICOH ELEMEX CORP
发明人： HORIGUCHI HIROYUKI , HIRANO SHINJI
IPC分类号： G01F1/68 , G01F1/684 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To do so that the flow velocity and flow rate of a fluid can be correctly measured in a low flow velocity range. SOLUTION: In a thermal flow sensor having detecting elements 3, 4 having at least one heating body 3, 4 in a passage 1 for flowing a fluid, a base board 2 for holding the detecting elements 3, 4 is disposed at a gravitationally upper side than the detecting elements 3, 4 whereby the fluid in the passage 1 is heated orderly from the vicinity of the heating bodies 3, 4 when the heating bodies 3, 4 are made heating, while the shield action of the base board 2 suppresses the natural convection from occurring, so that the flow velocity and flow rate of the fluid can be correctly measured in a low flow velocity range.

49. 发明专利

JPH11325998A GAS FLOW RATE MEASURING APPARATUS 失效
公开(公告)号：JPH11325998A
公开(公告)日：1999-11-26
申请号：JP12906198
申请日：1998-05-12
申请人： TOYOTA MOTOR CORP , DENSO CORP
发明人： YAMAGATA MITSUMASA , MORI NOBUO , NAKAYAMA TETSUYA , KAMIYA SHINICHI
IPC分类号： G01F1/68 , G01F1/42 , G01F1/684 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To obtain a gas flow rate measuring apparatus whereby the pressure loss can be reduced with ensuring a good measuring accuracy. SOLUTION: The gas flow rate measuring apparatus 10 comprises an air flow meter 20 mounted on a cleaner pipe 11 and orifice 30 provided in the cleaner pipe 11, the orifice 30 has a peripheral part fixed to the inner side wall of the cleaner pipe 11, the peripheral edge of a notch 31 formed into the orifice 30 and inner side wall of the cleaner pipe 11 define an opening 32 which partly reduces the passage sectional area in the cleaner pipe 11, and a measuring part of the air flow meter 20 is disposed in a reduced flow formed when an intake air passes through the opening 32.

50. 发明专利

JP2958113B2 How to determine the fluid flow rate 失效
公开(公告)号：JP2958113B2
公开(公告)日：1999-10-06
申请号：JP51543191
申请日：1991-09-18
申请人：ローベルト・ボッシュ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング
发明人： SHUTAINBURENAA URURITSUHI , ROOZENAU UIRII , BAGUNAA UORUFUGANGU , NOIBERUTO YURUGEN , PUFURIIGAA HERUMUUTO
IPC分类号： G01F1/68 , F02D41/18 , G01F1/696 , G01F1/698 , G01F15/04
CPC分类号： F02D41/187 , G01F1/6965 , G01F1/698

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