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71. 发明专利

JPH08166262A SHUTOFF VALVE INCORPORATED IN FLUIDIC GAS METER 失效
公开(公告)号：JPH08166262A
公开(公告)日：1996-06-25
申请号：JP30752894
申请日：1994-12-12
申请人： TOKYO GAS CO LTD , MATSUSHITA ELECTRIC IND CO LTD , YAZAKI CORP
发明人： NUKUI KAZUMITSU , KATO HIDEO , NIIMURA NORIO , YAMAGUCHI MASAKI , KATO RIKIO , SUZUKI KAZUTAKA
IPC分类号： G01F1/20 , F16K31/06 , F16K31/18 , G01F3/22 , G01F15/04
摘要： PURPOSE: To provide a shutoff valve for damping a pressure fluctuation (pulsation) produced during flowing of a small amount and preventing this from being transmitted to a fluidic element side. CONSTITUTION: A float valve 29 with a diaphragm 30 is incorporated in a main valve 18 and gas is caused to flow by driving a main valve opening/closing device 28 so as to close the main valve 18 during flowing of a small amount via the diaphragm 30 of the float valve 29 and thus, a pressure fluctuation is damped by means of the up and down movement of this float valve 29 and the action of the orifice 30. When a shutoff valve 17 is closed in emergency, by closing the main valve 18, driving a float valve control device 37 and by means of a float valve control shaft 31, the float valve 29 is tightly contacted with a float valve sheet 23.

72. 发明专利

JPH0894406A OUTPUT CORRECTION DEVICE OF FLOW VELOCITY SENSOR AND FLOWMETER 失效
公开(公告)号：JPH0894406A
公开(公告)日：1996-04-12
申请号：JP25755094
申请日：1994-09-27
申请人： TOKYO GAS CO LTD , YAMATAKE HONEYWELL CO LTD
发明人： NUKUI KAZUMITSU , SAKAI KATSUTO , SATO SHINICHI , OISHI YASUHARU
IPC分类号： G01F1/00 , G01F1/20 , G01F1/68 , G01F1/696 , G01F15/04 , G01P5/10 , G01P5/12
摘要： PURPOSE: To obtain a flowmeter by which an error is not generated in a flow rate to be operated and which can reduce the influence of a change in a flow velocity due to a pressure change or the like. CONSTITUTION: The output signal, of a flow sensor 30, which is in a nonlinear relationship with a flow rate is input to a linearization circuit 40, and the circuit outputs a signal in which a relationship with the flow rate becomes a nearly linear relationship. An averaging circuit 41 averages the output signal of the linearization circuit 40. The output signal of the averaging circuit 41 is input to an arithmetic part 45 via an A/D converter 42, and the part operates the flow rate.

73. 发明专利

JPH0843161A THERMAL AIR FLOW RATE DETECTOR 失效
公开(公告)号：JPH0843161A
公开(公告)日：1996-02-16
申请号：JP19591494
申请日：1994-07-28
申请人： UNISIA JECS CORP
发明人： TSUKADA MASAO , AOI HIROSHI , NAKAZAWA KOJI , SATO HIROYUKI
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04
摘要： PURPOSE:To enhance accuracy in the detection of flow rate of sucked air by deciding whether air is flowing forward or reversely. CONSTITUTION:A first heating resistor 29 and a second heating resistor 30 are formed, respectively, in the upstream and downstream on an insulating board. Variation of each resistance RH1, RH2 is inputted, in the form of flow rate voltage V1, V2, to an average value circuit 35 which delivers a flow rate average value voltage V3 to a selection circuit 43 and an inverting circuit 42. A comparator 34 compares the flow rate voltages V1, V2 and delivers a direction detection voltage Va to the selection circuit 43. If V1>V2, V3 is outputted as a flow rate detection signal and if V1

74. 发明专利

JPH0835869A AIR FLOWMETER 失效
公开(公告)号：JPH0835869A
公开(公告)日：1996-02-06
申请号：JP17229794
申请日：1994-07-25
申请人： HITACHI LTD
发明人： NISHIMURA YUTAKA , YOSHIKAWA TOKUJI
IPC分类号： G01F1/68 , F02D45/00 , G01F1/698 , G01F15/04
摘要： PURPOSE:To obtain true air flow rate by correcting air flow signal with air temperature signal obtained by operating the signal of air flowmeter. CONSTITUTION:The signal of a hot time type air flowmeter 100 is input in an engine control circuit 101 to obtain air temperature signal 103 and flow rate signal. From the electric potential at both ends of an air temperature probe, the resistance value of the air temperature probe is obtained through a computer operation and from the resistance, the air temperature is obtained. By using the relation between the flow rate signal and air flow signal stored in a memory in advance, conversion from the flow rate signal to air flow rate is executed with interpolation operation in an air flow rate converter 104. In air temperature corrector 105, by using the table of correction factor of air temperature on X-axis and air flow rate on Y-axis stored in a memory, the correction factor is found at the air flow signal for the converter 104 and air temperature signal for the signal 103. By multiplying the air flow signal from the converter 104 and the correction factor, the true air flow rate is obtained.

75. 发明专利

JPH07324956A PRESSURE FLUCTUATION ELIMINATOR UNIT FOR FLUIDIC GAS METER 失效
公开(公告)号：JPH07324956A
公开(公告)日：1995-12-12
申请号：JP12158394
申请日：1994-06-02
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , AICHI TOKEI DENKI KK , KANSAI GASMETER KK , KIMMON MFG CO LTD , TAKENAKA SEISAKUSHO CO LTD , TOYO GASMETER CO
发明人： NUKUI KAZUMITSU , OKABAYASHI MAKOTO , MINAMI TADAYUKI , KIMURA YUKIO , KANDA KOICHI , NAMIMOTO MASANOBU , OIKE HIDEYUKI , TOMOTA KEIICHI , KAMITE MINEYUKI , MIZUKOSHI YASUSHI
IPC分类号： G01F1/20 , F16K31/126 , G01F3/22 , G01F15/04
摘要： PURPOSE:To measure the quantity of gas accurately with a pressure drop within an allowable limit by disposing a pressure fluctuation eliminator on the upstream side from fluidic (FD) gas meter and feeding gas through a narrow channel thereof to the inlet side of the FD gas meter at the time of measurement of a micro flow rate. CONSTITUTION:Gas is fed at pressure P1 from the inlet 12 of a pressure fluctuation eliminator 11 for an FD gas meter through a pipe line 13 and enters at pressure P2 into an FD gas meter 14 where the flow rate is measured before the gas is fed at pressure P3 to a consumption apparatus. The eliminator 11 comprises a narrow channel 21, a diaphragm 22, a movable valve 23 operable integrally with the diaphragm 22, and a valve seat 24 and the gas pressure P3 at the outlet of the FD gas meter 14 is introduced through a pressure introduction pipe 25 to one side of the diaphragm 22. When the flow rate is low, the gas pressures P1, P2 and P3 are substantially equal to each other and the movable valve 23 is set gravitationally on the valve seat 24. Consequently, even if the gas ejected from the narrow channel 21 reaches the inlet of the FD gas 14 through the pipe line 13 to cause fluctuation in the pressure P1, the quantity of gas to be ejected is constant.

76. 发明专利

JPH07229776A AIR FLOW RATE MEASURING DEVICE 失效
公开(公告)号：JPH07229776A
公开(公告)日：1995-08-29
申请号：JP2231794
申请日：1994-02-21
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABE HIROYUKI , ISHIKAWA HITOSHI
IPC分类号： G01F1/68 , G01F1/696 , G01F15/04
摘要： PURPOSE:To improve the measuring accuracy of air flow, by providing a humidity detecting device in an air passage or in an air cleaner, detecting the humidity of the flowing-in air so as to decide the correcting amount, and correcting the output signal of an air flow rate measuring device. CONSTITUTION:In the same air passage, a hygrometer, a heating resistor, and a heat sensitive resistor are provided, a heating resistor signal 5, a heat sensitive resistor signal 6, and humidity detecting device signal 7 are taken in to a CPU, and the air flow rate found from the heating resistor signal 5 and the heat sensitive resistor signal 6 lay applying an operation process is corrected by the humidity detecting device signal 7, and it is output as an output signal 4 after the humidity correction. Consequently, by adding the humidity which is an important parameter of the air together with the air pressure and the temperature, the measuring accuracy of the air flow rate, especially the measuring accuracy at the variation of the ambiance, can be improved.

77. 发明专利

JPH07181068A FLOW SENSOR AND METHOD FOR MEASURING FLOW RATE OF GAS 失效
公开(公告)号：JPH07181068A
公开(公告)日：1995-07-18
申请号：JP32766493
申请日：1993-12-24
申请人： RICOH KK , RICOH SEIKI CO LTD , RICOH ELEMEX CORP
发明人： AKIYAMA ZENICHI
IPC分类号： G01P5/12 , B81B3/00 , B81C99/00 , G01F1/68 , G01F1/692 , G01F1/696 , G01F15/04
摘要： PURPOSE:To provide a flow sensor having simple and small structure and high sensitivity in which the fluctuation of characteristics due to ambient temperature is eliminated along with zero drift. CONSTITUTION:A micro-bridge type flow sensor element 1 is fixed onto a board 2 and piezoelectric bimorph actuators 3, 4 bonded to the lower surface of the board 2 are subjected to micro-oscillation in the arrow directions + or -V. The oscillating direction is not perpendicular to the moving direction Q of gas flowing in parallel with the plane of the flow sensor element 1 and it is preferably in parallel with the moving direction Q. This arrangement offsets zero drift of the flow sensor element while eliminating the influence of ambient temperature.

78. 发明专利

JPH07159214A HEATING RESISTOR TYPE AIR FLOWMETER 失效
公开(公告)号：JPH07159214A
公开(公告)日：1995-06-23
申请号：JP30621693
申请日：1993-12-07
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ITSUJI TAKAYUKI , AKAMATSU MASUO , YONEDA HIROSHI
IPC分类号： G01P5/12 , G01F1/68 , G01F1/684 , G01F1/696 , G01F1/698 , G01F15/04
摘要： PURPOSE:To make it possible to carry out zero adjustment and span adjustment independently by providing an output regulating circuit with a subtractor having one input receiving an output signal from an amplifier and the other input terminal receiving reference voltage. CONSTITUTION:A heating resistor 1 and a temperature-sensitive resistor 2 are set in an air channel 30. A reference resistor 4 for converting the current flowing through the resistor 1 into a voltage and resistors 5, 6, 7 constitute a bridge circuit. The bridge circuit and the resistors 1, 2 control a transistor 3 through differential amplifiers 8, 9 so that the resistor 1 constantly exhibits a predetermined temperature with respect to the air temperature. Consequently, the current flowing through the resistor, and thereby the terminal voltage V0 thereof, varies according to the air flow rate when the temperature of the resistor 1 is controlled at a constant level. An output signal is delivered from a noninverted amplifier 11 to one input terminal of a subtractor 18 in an output regulating circuit 101 having the other input terminal receiving an output from a voltage follower 21 for maintaining a constant reference voltage. Consequently, zero- adjustment can be effected independently of span adjustment.

79. 发明专利

JPH0754264B2 失效
公开(公告)号：JPH0754264B2
公开(公告)日：1995-06-07
申请号：JP30416190
申请日：1990-11-13
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04

80. 发明专利

JPH06265388A AIR FLOW RATE MEASURING INSTRUMENT 失效
公开(公告)号：JPH06265388A
公开(公告)日：1994-09-20
申请号：JP5542993
申请日：1993-03-16
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： OIKAWA TOSHINORI , UCHIYAMA KAORU
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04
摘要： PURPOSE:To provide an air flow rate measuring instrument which is less in temperature characteristic measuring error. CONSTITUTION:In the measuring instrument in which a bridge circuit is constituted of an exothermic resistor 3 positioned in intake air, temperature sensitive resistor 9 for detecting the temperature of the intake air, and a plurality of resistors 4, 5, 6, 7, and 8, the temperature coefficient of resistivity of a resistor 18 constituting an amplifier circuit together with another resistor 17 is made larger than that of the resistor 17. Since the temperature characteristic measuring error can be reduced when the amplification factor of the amplifier circuit is changed by changing the temperature, the temperature characteristics of the measuring instrument can be improved.

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