专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

81. 发明专利

JPH0646166B2 失效
公开(公告)号：JPH0646166B2
公开(公告)日：1994-06-15
申请号：JP61586
申请日：1986-01-08
IPC分类号： G01F1/68 , G01F1/684 , G01F15/04

82. 实用新型

JPH0610261Y2 失效
公开(公告)号：JPH0610261Y2
公开(公告)日：1994-03-16
申请号：JP2898888
申请日：1988-03-04
IPC分类号： G01F1/68 , F02D35/00 , F02D41/18 , G01F1/684 , G01F15/04

83. 发明专利

JPH05223611A AIR FLOWMETER 失效
公开(公告)号：JPH05223611A
公开(公告)日：1993-08-31
申请号：JP2649692
申请日：1992-02-13
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ISHIKAWA HITOSHI
IPC分类号： G01F1/68 , G01F1/00 , G01F1/698 , G01F15/04
摘要： PURPOSE:To obtain a thermal type air flowmeter in which a memory for storing bridge detection outputs, an A/D converter of the bridge detection outputs, D/A converter of the bridge detection outputs stored and a controller for controlling the device to facilitate the adjusting of an output of the thermal type air flowmeter. CONSTITUTION:A bridge detection output 17 of a bridge circuit 1 is stored into a memory 24 and an output of a thermal type air flowmeter stored in the memory is read out with a controller 22 according to a value of the bridge detection output 17 at a certain air flow rate to be converted into analog from digital as output of the air flowmeter. This facilitates the adjustment of a flow rate output characteristic of the air flowmeter.

84. 实用新型

JPH0564733U 失效
公开(公告)号：JPH0564733U
公开(公告)日：1993-08-27
申请号：JP1315992
申请日：1992-02-08
IPC分类号： G01F1/68 , G01F1/698 , G01F1/86 , G01F15/04

85. 发明专利

JPH05157603A METHOD FOR CORRECTING FLOW RATE OF FLOWMETER 失效
公开(公告)号：JPH05157603A
公开(公告)日：1993-06-25
申请号：JP34859891
申请日：1991-12-06
申请人： YAMATAKE HONEYWELL CO LTD
发明人： HISANAGA TETSUO , AOSHIMA SHIGERU , OISHI YASUHARU , WATANABE TAKESHI
IPC分类号： G01F1/68 , G01F1/696 , G01F15/04
摘要： PURPOSE:To eliminate the flow rate error of a flowmeter resulting from the difference in attitude of a flow velocity sensor so that the flow rate of a gas can be stably measured by calculating the flow rate of a fluid to be measured without relying upon natural convection from the output signal of the natural convection found by intermittently heating a heater and the output signal of the flow velocity sensor. CONSTITUTION:When a microcomputer 25 issues an instruction, natural convection is generated or stopped by intermittently turning on or off the heater element 4 of a flow velocity sensor 10 and, in addition, immediately after the heater 4 is switched from the turned off state to turned on state, the output signals of an upstream and downstream temperature detecting resistance elements 5 and 6 are inputted to a differential amplifier 22 and the output data of the amplifier 22 are caught and held at two times designated by the microcomputer 25. The data are inputted to the microcomputer 25 after A/D conversion 24 and the microcomputer 25 calculates an output signal based on the natural convection. In addition, the microcomputer 25 calculates the flow rate of a fluid to be measured without relying on the natural convection from the output signals of the natural convection and sensor 10.

86. 发明专利

JPH05149768A SUCTION-TYPE FLOW SENSOR 失效
公开(公告)号：JPH05149768A
公开(公告)日：1993-06-15
申请号：JP31263891
申请日：1991-11-27
申请人： YOKOGAWA ELECTRIC CORP
发明人： IZUMI NAONORI
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04 , G01P5/12
摘要： PURPOSE:To perform temperature correction with a simple means by inputting the output signals of thermistors for measurement to a differential amplifier as differential input signals and offsetting the output variations of the thermistors caused by the change of the ambient temperature. CONSTITUTION:When a fluid to be measured flows through a measuring flow passage 1a, the electric current flowing to the thermistor for measurement 2a of a constant-resistance circuit 3a is increased so as to heat the thermistor 2a by the temperature lowered by the flow of the fluid so that the surface of the thermistor 2a can be maintained at a constant temperature. Since no fluid current comes into collision with a thermistor 2b for comparison, the current flowing to the thermistor 2b does not increase. Therefore, when the signals corresponding to the heating currents of the thermistors 2a and 2b are inputted to a differential amplifier 4, the flow rate of the fluid to be measured flowing to the thermistor 2a can be measured without receiving any influences from the change of the ambient temperature. When this method is used, temperature correction can be easily performed by taking the difference between the outputs of the thermistors for measurement and comparison without using any complicated analog arithmetic circuit, etc.

87. 发明专利

JPH05149767A MASS FLOWMETER 失效
公开(公告)号：JPH05149767A
公开(公告)日：1993-06-15
申请号：JP33129491
申请日：1991-11-20
申请人： CKD CORP
发明人： KOBAYASHI HIDEO , GOSHIMA KENICHI , SUDO YOSHIHISA
IPC分类号： G01F1/68 , G01F1/698 , G01F15/04
摘要： PURPOSE:To measure the mass flow rate of a small amount of fluid with high accuracy. CONSTITUTION:In this mass flowmeter adopting a constant-temperature drive system, a correction circuit 10 which performs zero-drift adjustment on output voltages of heat sensitive coils R1 and R2 is connected in series with a temperature correction circuit 11 which performs gain adjustment. In addition, zero drift correction is calculated by using the sum of the output voltages of the coils R1 and R2 as a gas temperature index.

88. 发明专利

JPH0572221A AIR VELOCITY SENSOR 失效
公开(公告)号：JPH0572221A
公开(公告)日：1993-03-23
申请号：JP26290891
申请日：1991-09-12
申请人： MURATA MANUFACTURING CO
发明人： OSADA SHINICHI , TANIHIRO TSUGI
IPC分类号： G01F1/68 , G01F1/692 , G01F15/04 , G01P5/12
摘要： PURPOSE:To obtain an air velocity sensor in an output signal of which an error hardly occurs even when the temperature of air current to be measured changes sharply and which has high responsiveness. CONSTITUTION:This air velocity sensor 10 comprises a base 12, and a thin-film temperature-measuring resistor 14 for a heater and a thin-film temperature- measuring resistor 16 for temperature compensation are formed on the base 12. The thin-film temperature-measuring resistor 14 for the heater and the thin- film temperature-measuring resistor 16 for temperature compensation are formed in the same shape and dimensions and each of them is formed by applying Pt, for instance, on a rectangular alumina base of a thickness 0.15mm, for instance, by laser trimming or etching. On the base 12, moreover, a circuit of fixed temperature method is formed as a is formed as a detecting circuit 18, which is connected to the thin-film temperature-measuring resistor 14 for the heater and the thin-film temperature-measuring resistor 16 for temperature compensation.

89. 发明专利

JPH0552625A THERMAL TYPE AIR FLOWMETER AND ENGINE CONTROL DEVICE 失效
公开(公告)号：JPH0552625A
公开(公告)日：1993-03-02
申请号：JP21368591
申请日：1991-08-26
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HANZAWA KEIJI , SUZUKI MASAYOSHI , MATSUKURA TETSUO
IPC分类号： F02D41/18 , F02D45/00 , G01F1/68 , G01F1/692 , G01F1/698 , G01F15/02 , G01F15/04 , G01P5/12
摘要： PURPOSE:To measure air flow rate accurately without being influenced by humidity even if air humidity is changed in the case of measuring the air flow rate by using a heating resistance. CONSTITUTION:Heating electric current to become a resistance value (a calorific value) for keeping a circuit balance is supplied to a heating resistance Rh under a current supply control. This current supply control signal is carried out by output from OPI. Besides a temperature sensing resistance Rc for compensating an air temperature, a humidity sensing resistance Ru for compensating air humidity is added to this current supply control circuit, and the resistance value to be a balance condition for the heating resistance is corrected according to temperature change and humidity change. The corrected heating electric current is taken out after being converted into voltage from resistance R1.

90. 发明专利

JPH0472176B2 失效
公开(公告)号：JPH0472176B2
公开(公告)日：1992-11-17
申请号：JP11372083
申请日：1983-06-23
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJEDA HIROSHI , SAKA TATSUO , SHIRASAWA TADANORI , OKAMOTO MASAYUKI
IPC分类号： G01F3/22 , G01F15/00 , G01F15/04 , G01F15/06

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式