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1. 发明专利

JPH07306072A HEAT-GENERATING RESISTANCE BODY FOR APPARATUS FOR MEASURING FLOW RATE OF AIR 失效
公开(公告)号：JPH07306072A
公开(公告)日：1995-11-21
申请号：JP9835494
申请日：1994-05-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABE HIROYUKI , OIKAWA TOSHINORI
IPC分类号： G01P5/12 , G01F1/68 , G01F1/69
摘要： PURPOSE:To improve a measuring accuracy for a flow rate of air in a range of high flow rates in an apparatus measuring an air flow rate. CONSTITUTION:A cross section of a supporting body 2 holding a resistance body 1 of a heat-generating resistance body 5 is made elliptic or streamline, thereby improving an accuracy of an apparatus for measuring an air flow rate. The effect is noticed particularly in a range of high flow rates.

2. 发明专利

JPH07120287A HEATING RESISTOR 失效
公开(公告)号：JPH07120287A
公开(公告)日：1995-05-12
申请号：JP26688193
申请日：1993-10-26
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ISHIMURA MITSURU , ABE HIROYUKI
IPC分类号： G01P5/12 , G01F1/68 , G01F1/688 , G01F1/69 , G01P5/10
摘要： PURPOSE:To provide balanced surface temperature distribution, to improve the measuring accuracy and to prevent the aging change of resistance value of a heating resistor by increasing the film thickness at the center of a support so as to be thicker than a film near the end of the support. CONSTITUTION:An alumina pipe 1 is a support for holding leads 2 formed out of an insulator such as zirconia, etc., and a resistor. Glass adhesive 3 fixes the leads 2. The surface of a thin film resistor 4 formed on the surface of the pipe 1 is spirally trimmed 14 to be formed. Further, an overcoating glass 5 covering the entire surface of the resistor is provided. Particularly, in order to vary thicknesses of thin films near the ends and the center of the pipe 1, a thin film resistor 10 of a first layer is formed on the entire surface of the pipe 1. Since the thickness near the center is increased thereby to bury holes on the surface of the support 1 dispersed in a crater state, a temperature distribution balance of a heating resistor can be equilibrated.

3. 发明专利

JPH07110250A AIR FLOW RATE MEASURING INSTRUMENT 失效
公开(公告)号：JPH07110250A
公开(公告)日：1995-04-25
申请号：JP25545193
申请日：1993-10-13
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： OIKAWA TOSHINORI , ABE HIROYUKI
IPC分类号： G01F1/68 , F02D41/18 , G01F1/684 , G12B17/02
摘要： PURPOSE:To improve the radio wave interference resistance of an air flow rate measuring instrument against radio wave noise by providing a groove in the base and sticking the outer peripheral part of a shield case to the base after burying the case in the groove. CONSTITUTION:A circuit board 1 which is the drive circuit of an intake air flow rate measuring device for an internal combustion engine is protected from external radio waves by a shield case 2 and a shield cover 3. A base 4 has a groove in which the case 2 can be buried and the case 2 is stuck to the base 4 with a bonding agent 5 after the case 2 is buried in the groove. Since this structure is constituted so that the entire lower surface of the case 2 can come into contact with the base 4, a large grounding area can be secured between the case 2 and the base 4 and the effect of leading the external radio waves to the base 4 is improved. Therefore, the radio wave interference resistance of the air flow rate measuring instrument can be remarkably improved, because the grounding effect of the external radio waves in a high frequency domain is specially improved.

4. 发明专利

JPH05223609A AIR FLOWMETER 失效
公开(公告)号：JPH05223609A
公开(公告)日：1993-08-31
申请号：JP2498892
申请日：1992-02-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABE HIROYUKI , IGARASHI SHINYA
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To achieve higher intake air measuring accuracy, a protection of a hot wire and a cold wire and higher radio wave resistance disturbing characteristic with a rectifier grid concerning an air flowmeter for an internal combustion engine. CONSTITUTION:A cylinder which has a cylindrical or polygonal sectional area covering a hot wire 1 and a cold wire 2 is so arranged to be molded integral with a body 4 or to contact an earth of an electronic circuit electrically. This enables the elimination of a rectifier grid provided separately at an outlet or inlet of introducing intake air and achieves an effect of reducing the unit cost with a reduction in the number of parts and a reduction in the manhour. Besides, an air flowmeter with excellent quality can be supplied.

5. 发明专利

JPH05172604A THERMAL TYPE AIR FLOW METER 失效
公开(公告)号：JPH05172604A
公开(公告)日：1993-07-09
申请号：JP31045391
申请日：1991-11-26
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： OIKAWA TOSHINORI , ABE HIROYUKI
IPC分类号： F02D35/00 , F02D45/00 , G01F1/68 , G01F1/684
摘要： PURPOSE:To enable a slip-out strength to be improved by simplifying a structure for mounting a rectification lattice to a body and at the same time a cost to be reduced by reducing a manufacturing process and the number of parts and with a structure which is suited for automation. CONSTITUTION:A rectification lattice 5 is inserted into a body 4 in L shape or in double folding. Further, a metal or plastic ring 6 is press-fit into the body 4 and the press-fit force retains the rectification lattice 5.

6. 发明专利

JPH0694498A AIR FLOW MEASURING DEVICE 失效
公开(公告)号：JPH0694498A
公开(公告)日：1994-04-05
申请号：JP24762592
申请日：1992-09-17
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： OIKAWA TOSHINORI , ABE HIROYUKI
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To provide a lightweight air flow rate measuring device which is excellent in radio obstruction resistance, and improved in quality by simplification of manufacturing process. CONSTITUTION:An air flow rate measuring device is constituted by integrating a plastic body 3 into a passage block 10 including a sub-air passage part 2 and having a flat surface part capable of setting a driving circuit 9. Thus, excellent radio obstruction resistance is provided, and reduction in weight can be promoted. Further, the quality is stabilized by the improvement in efficiency by simplification of manufacturing process and miniaturization of facility.

7. 发明专利

JPH05248906A 失效
公开(公告)号：JPH05248906A
公开(公告)日：1993-09-28
申请号：JP4664692
申请日：1992-03-04
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABE HIROYUKI , OIKAWA TOSHINORI
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To enhance reliability of radio interference resistive performance by a module, reduce assembling manhours by reduction of the number of part items, and reduce cost by a structure suitable for automation. CONSTITUTION:A columnar through type capacitor 5 having a square or circular cross section is inserted into a hole part having the same cross section as the capacitor 5 and provided in a surface of a metallic base 7. After the insertion, electric connection 8 such as soldering, brazing, and conductive adhesive agent is performed to constitute a module.

8. 发明专利

JPH08327422A MEASURING APPARATUS OF AIR FLOW RATE 失效
公开(公告)号：JPH08327422A
公开(公告)日：1996-12-13
申请号：JP13140895
申请日：1995-05-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KADOHIRO TAKASHI , IGARASHI SHINYA , ABE HIROYUKI
IPC分类号： G01P5/12 , F02D35/00 , G01F1/68 , G01F1/684 , G01P5/10
摘要： PURPOSE: To obtain a measuring apparatus by which a pressure loss is reduced and whose measuring accuracy is enhanced by a method wherein the transverse width of a support part as the coupling part of a body to a subpassage is made smaller than the transverse width of a part constituting an entrance face in the subpassage. CONSTITUTION: The intake air 9 is supplied to an engine through a main passage 2 and a subpassage 3 which are constituted inside a body 1. A heat-generating resistor 4 and a temperature-sensing resistor 5 which are installed inside the passage 3 are connected electrically to support pins 6 inside a holder part 7, and they are connected to a drive circuit 10 via lead wires 8. On the basis of output signals of the resistors 4, 5, the circuit 10 outputs a signal related to an air flow rate. A member 17 which constitutes the passage 3 is mounted on a module part 18 on which the circuit 10 is installed, and the module part 18 is inserted from a hole in the body 1 so as to be installed at the outer wall part of the body 1. At this time, the transverse width of the holder part 7 is constituted to be smaller than the transverse width of a member constituting an entrance part in the passage 3, and a pressure loss is reduced. In addition, since the quantity of a member covering the support pins 6 is reduced, a wall temperature characteristic is enhanced.

9. 发明专利

JPH04290923A HOT-WIRE TYPE AIR FLOW METER 失效
公开(公告)号：JPH04290923A
公开(公告)日：1992-10-15
申请号：JP5630191
申请日：1991-03-20
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABE HIROYUKI , ISHIKAWA HITOSHI
IPC分类号： G01F1/68 , G01F1/69
摘要： PURPOSE:To enhance the measuring accuracy for the sucked air by quantitatively specifying the ratio of the winding width of a thermo-sensitive resistor to the overall length of a cylindrical support. CONSTITUTION:A thermo-sensitive resistor element is composed of a cylindrical support 6 made of insulative substance, a thermo-sensitive heat emitting resistor 5 formed on this support 6, and a lead wire 7 which is inserted in the two ends of the support 6 and adhered thereto by glass. Therein the condition l1/l2X100(%)>=70 is met, where l2 is overall length of the support 6 and l1 is the winding width of the resistor 5. This promotes to unify the temp. distribution over the surface of the hot-wire, contributing to enhancement of the response characteristic, reduction of output noise, and heightening of the measuring accuracy for the suction rate of air flow.

10. 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.

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