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1. 发明专利

JPH08297039A HEATING ELEMENT TYPE AIR FLOW MEASURING APPARATUS 失效
公开(公告)号：JPH08297039A
公开(公告)日：1996-11-12
申请号：JP10341095
申请日：1995-04-27
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： IGARASHI SHINYA , SAITO TAKAYUKI , KOBAYASHI CHIHIRO , HIRAYAMA HIROSHI
IPC分类号： G01F1/68 , F02D35/00 , G01F1/684
摘要： PURPOSE: To reduce the pressure drop by forming a sub-channel of a compositional member having substantially a spherical profile, opening the inlet of the sub-channel in a plane perpendicular to the main flow while opening the outlet substantially in parallel with the main flow, thereby facilitating the arrangement of sub-channel in a main passage. CONSTITUTION: The sub-channel comprises an inlet 301 opened in a plane perpendicular to the direction 17 of main flow in a main passage 5, a channel 302 extending in parallel with the direction 17 and equipped with a heating element 1 inside, a curved part 303 opened in the outer circumferential direction of the channel 302 on the downstream side from the element 1 in order to bypass the flow in the sub-channel, a channel 304 for feeding the flow oppositely to the main flow substantially over the entire outer circumference except the vicinity of supporting member for the channel 302, and an outlet 305 opened in the outer wall face of the compositional member of sub-channel extending substantially in parallel with the main flow. The sub-channel part 400 has substantially spherical overall profile except the supporting part. An electronic circuit 8 is fixed onto a base member 7 while being protected by a circuit housing 9 integrated with a connector 11 and a cover 10. This structure facilitates fixing of the sub-channel.

2. 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.

3. 发明专利

JPH04344424A HOT WIRE TYPE AIR FLOW METER 失效
公开(公告)号：JPH04344424A
公开(公告)日：1992-12-01
申请号：JP11581591
申请日：1991-05-21
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： FURUHASHI YOICHI , IGARASHI SHINYA
IPC分类号： G01F1/68 , G01F1/684 , G01F15/12
摘要： PURPOSE:To reduce stains for improving durability while providing a high accuracy output property by providing flow arranging gratings such as honeycomb, fin, etc., in a bypass path section in a flow mesuring section provided to cross a main air path. CONSTITUTION:Air sucked in a body 1 is diversed into a main air path 5 and bypass path inlet 6. Air entering the inlet 6 passes through a bypass path 6a disposed parallel to the main air path 5, passes through a bypass path 6b in a flow mesasuring section 7 provided to cross the main air path 5 and joins in the main air path 5 from a bypass path outlet 10. The bypass path 6b in the flow measuring section 7 is provided with a flow arranging grating 11 such as honeycomb, fin, etc. Thus, since air entering an inlet 6 flows through the bypass path 6b in the flow measuring section 7 without causing air turbulence, an exothermic resistor 3 can detect air flow under the best condition without receiving any air turbulence.

4. 发明专利

JPH08327423A MEASURING APPARATUS OF AIR FLOW RATE 失效
公开(公告)号：JPH08327423A
公开(公告)日：1996-12-13
申请号：JP13316995
申请日：1995-05-31
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KADOHIRO TAKASHI , TSUMAGARI MAMORU , IGARASHI SHINYA , KOBAYASHI CHIHIRO
IPC分类号： G01F1/68 , F02D41/18 , F02D45/00 , G01F1/684
摘要： PURPOSE: To obtain a measuring apparatus which prevents a subpassage constituent member from falling and whose safety is enhanced by a method wherein a stopper for fall prevention of the subpassage constituent member is installed in an insertion hole at a circuit module part which is installed at a part of a body. CONSTITUTION: The intake air 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 at the inside of the passage 3 are connected to an electronic circuit 9 via support pins 6 and lead wires 8. On the basis of signals from the resistors 4, 5, the circuit 9 outputs a signal related to an air inflow rate. An insertion hole 19, which is made in the body, at a circuit module part 18 to which a subpassage constituent member 7 is bonded is formed to be a size through which the member 7 can be inserted. A stopper 11 for fall prevention of the member 7 is installed at a part of the insertion hole 19. It does not interfere when the member 7 is inserted. When the member 7 falls, the stopper acts in such a way that the bonding face of the member 7 to the module part 18 does not come off. Thereby, even when the member 7 comes off, it is possible to prevent the member 7 from falling into the passage 2 or the engine.

5. 发明专利

JPH06307906A AIR FLOW RATE MEASURING EQUIPMENT 失效
公开(公告)号：JPH06307906A
公开(公告)日：1994-11-04
申请号：JP10216093
申请日：1993-04-28
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SENDA SHINYA , KOBAYASHI CHIHIRO , IGARASHI SHINYA , TSUTSUI MITSUKUNI , MIYAZAKI ATSUSHI , SUEMATSU HIROYUKI , AKAGI YOSHIHIKO
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To provide a highly accurate and reliable air flow rate measuring equipment by suppressing the measurement error when the pulsation of air in the suction system of the internal-combustion engine of an automobile is accelerated to produce a counter flow. CONSTITUTION:The outlet of a sub-air passage 4 is opened in the direction substantially perpendicular to the main flow of a main air passage 3 or in the obliquely downward direction. The structural member of the passage is provided with inclining faces in the upstream side and downstream side of the outlet in order to eliminate a plane normal to the main stream against which the counter flow strikes directly. Consequently, local increase of dynamic pressure due to the counter flow in the vicinity of the outlet of the sub-air passage 4 is avoided thus reducing the counter flow in the sub-air passage 4. This constitution reduces the output error of an air flow rate measuring equipment by a factor of 2 or 3 as compared with a conventional equipment when a counter flow is generated in the main air passage 3 due to pulsation of the suction system.

6. 发明专利

JPH063172A HEAT GENERATION RESISTANCE TYPE AIR FLOWMETER 失效
公开(公告)号：JPH063172A
公开(公告)日：1994-01-11
申请号：JP15779292
申请日：1992-06-17
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ARAI NOBUKATSU , IGARASHI SHINYA , HIRAYAMA HIROSHI
IPC分类号： G01F1/68 , G01F1/684 , G01F15/04 , G01F15/12 , G01P5/12
摘要： PURPOSE:To obtain flow information proportional to average flow speed in a measuring sub-passage by taking in a plurality of even flow (dynamic pressure and static pressure) and having full confluence thereof in a various-flow speed distribution. CONSTITUTION:A measuring sub-passage 7 is eccentrically provided with respect to the axial center of a main passage 3 to the side of a circuit unit 2 and provided inside a stay 10 penetrating the main passage 3. A groove formed in a stay upstream end 10a is partially covered with a plate-like member 11 and four sub-passage inlets 4a, 4b, 4c, 4d are formed near the axial center of the main passage 3. An radial intensive passage 6 combining four flows is provided on the upstream side of the axial measuring sub-passage 7. An angular flow guide 31 is provided in an inlet part of the intensive passage 6 and a cut groove 32 is made at the outside corner part of a connection part with the measuring sub-passage 7.

7. 发明专利

JPH05142007A AEROMETER AND THROTTLE BODY WITH AEROMETER 失效
公开(公告)号：JPH05142007A
公开(公告)日：1993-06-08
申请号：JP30445091
申请日：1991-11-20
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： IGARASHI SHINYA , TSUTSUI MITSUKUNI
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To make an aerometer small in size and light in weight and to attain improvement of productivity, reduction of the cost and improvement of precision in measurement. CONSTITUTION:A subordinate air passage 3 for measuring an air flow rate is provided in a main air passage 2. The subordinate air passage 3 is divided into elements A and B. The element A has flow rate detecting elements 6 and 7 and a member 4 constituting these elements is made integral with a circuit module 8 for measuring the flow rate. The member 4 is inserted into the main air passage 2 from a fitting hole 1a provided in the body 1 of an aerometer (the main air passage), and set therein. The element B is a rectangular groove 5 molded integrally with the body 1. The groove is positioned on the downstream side of the member 4 and made fit to the member 4, being covered with a part thereof, and thus the subordinate air passage 3 being bent is formed. The subordinate air passage being bent may also be formed in the member 4 itself, and it is allowed also to form a vertical wall surface on the inner wall of the main air passage 2, in place of the rectangular groove 5, and to make the surface opposite to the wall surface of the exit of the member 4.

8. 发明专利

JPH0587607A AIR FLOW RATE SENSOR, OXYGEN SENSOR AND FUEL CONTROL SYSTEM 失效
公开(公告)号：JPH0587607A
公开(公告)日：1993-04-06
申请号：JP14463291
申请日：1991-06-17
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SUGIURA MASATOSHI , UCHIYAMA KAORU , IGARASHI SHINYA
IPC分类号： F02D41/18 , F02D45/00 , G01F1/58 , G01F1/60 , G01N27/76
摘要： PURPOSE:To obtain a sensor with a minimized pressure loss of a path by enabling the measuring an air flow rate in a measuring tube or the amount of oxygen contained therein from outside the path without arranging a detector in the path of the measuring pipe. CONSTITUTION:A magnetizing coil 11a is arranged on a pipe wall of a pipe body element 10a among suction pipes (measuring pipes) and a magnetic field is generated sufficiently to magnetize air 1 passing through a path. A magnetic detection coil 11b is arranged on the downstream closely to the pipe body element 10a to induce a voltage proportional to a flow velocity in the coil 11b by an electromagnetic induction when the air 2a magnetized passes through the coil 11b. The magnetizing coil 11, for example, is made up of a superconductor. The induced voltage undergoes a signal processing by a magnetic detection 102 and various signal processing circuits 103-107 thereby calculating an air flow or the amount of oxygen contained therein.

9. 发明专利

JPH0567502A THERMAL AIR FLOWMETER 失效
公开(公告)号：JPH0567502A
公开(公告)日：1993-03-19
申请号：JP22690391
申请日：1991-09-06
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： FURUHASHI YOICHI , IGARASHI SHINYA , MASUKO HIDETOSHI
IPC分类号： G01F1/68 , G01F1/69 , G01P5/12 , H01C1/14 , H01C3/14 , H01C13/00
摘要： PURPOSE:To provide a highly accurate thermal air flowmeter by reducing the axial deviation between conductor leads in a bobbin used as the heating resistor of the flowmeter and eliminating the inclination of the heating resistor, and then, reducing output noise. CONSTITUTION:A conductor lead, the cross-sectional area of which at its both end sections is smaller than that at its pipe inserting section, is passed through a pipe 7 made of an insulating material from one side and fixed to the pipe 7 with a bonding agent 9. Then, the lead is cut into two parts 8a and 8b as shown in the figure by energizing the lead from both sides.

10. 发明专利

JPH04318240A INTEGRAL AIR FLOW METER THROTTLE BODY FOR AUTOMOTIVE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH04318240A
公开(公告)日：1992-11-09
申请号：JP8652091
申请日：1991-04-18
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HASUDA SHIGERU , USUI TOSHIBUMI , IGARASHI SHINYA
IPC分类号： F02D35/00 , F02M69/48
摘要： PURPOSE:To perform back lowness of a throttle body by optimizing a position of a subflow path outlet to provide a distance of a throttle valve approximating the subflow path outlet, in the case of the hot wire integral type throttle body. CONSTITUTION:Air, sucked from an air cleaner by an intake negative pressure of an engine, is straightened by a honeycomb 2 in an inlet of a throttle body 1 and divided to flow in a main flow path 3 and a subflow path 4. The air, flowing in the subflow path 4, passes through a hot wire element part 7, and the air, whose flow amount is measured in a hot wire module part 8, is delivered from a subflow path outlet 11. The air, joining with the main flow path 3, is controlled by a throttle valve 14 and supplied to the engine.

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