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    Thermal Flow Meter
    2.
    发明申请
    Thermal Flow Meter 审中-公开

    公开(公告)号：US20170336232A1

    公开(公告)日：2017-11-23

    申请号：US15659309

    申请日：2017-07-25

    Applicant: Hitachi Automotive Systems, Ltd.

    Inventor： Shinobu TASHIRO ,  Keiji HANZAWA ,  Noboru TOKUYASU ,  Takeshi MORINO ,  Ryosuke DOI ,  Akira UENODAN

    IPC: G01F1/684 ,  G01F1/696 ,  G01F15/14

    Abstract: It is an object of the present invention to improve a measurement accuracy of a thermal flowmeter. A circuit package 401 is such that a measurement surface 430 and a backside of measurement surface 431 of a rear surface thereof are located in a bypass passage, and the bypass passage is configured to allow a measurement target gas 30 to flow upon dividing the measurement target gas 30 into a flow path 386 at a side of the measurement surface 430 of the circuit package and a flow path 387 at a side of the backside of measurement surface 431 of a rear surface of the measurement surface 430, and an inflow-side end surface of the circuit package for dividing the measurement target gas 30 has different shapes at the side of the measurement surface and at the side of the backside of measurement surface. The inflow-side end surface of the circuit package for dividing the measurement target gas 30 is formed with a reference line 700 dividing the measurement target gas 30, and an end surface 701a at the side of the measurement surface with respect to the reference line and an end surface 701b at the side of the backside of measurement surface with respect to the reference line are formed to be asymmetrical.

    PHYSICAL QUANTITY DETECTION DEVICE
    4.
    发明申请
    PHYSICAL QUANTITY DETECTION DEVICE 审中-公开

    公开(公告)号：US20200209034A1

    公开(公告)日：2020-07-02

    申请号：US16633636

    申请日：2018-08-06

    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

    Inventor： Akira UENODAN ,  Takahiro MIKI ,  Takayuki YOGO ,  Binti Haridan FATIN FARHANAH ,  Tsutomu KONO ,  Shinobu TASHIRO

    IPC: G01F5/00 ,  G01K13/02 ,  G01N33/00 ,  G01L9/00

    Abstract: To obtain a low-pressure-loss physical quantity detection device that can detect a plurality of physical quantities of intake air. A physical quantity detection device of the present invention that detects a plurality of physical quantities of a measured gas flowing in a main passage, the physical quantity detection device includes: a circuit board on which a sensor that detects the plurality of physical quantities and an electronic component that controls the physical quantities are mountable; a circuit board accommodating unit that accommodates the circuit board; and a sub-passage in which a flow sensor is disposed. The circuit board is accommodated in the circuit board accommodating unit on an upstream side of the sub-passage, and disposed in parallel with the measured gas flowing through the main passage.

    THERMAL FLOWMETER
    6.
    发明申请
    THERMAL FLOWMETER 审中-公开

    公开(公告)号：US20190323871A1

    公开(公告)日：2019-10-24

    申请号：US16464867

    申请日：2017-09-27

    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

    Inventor： Akira UENODAN ,  Masashi FUKAYA ,  Tomoaki SAITO ,  Shinobu TASHIRO ,  Tsubasa WATANABE

    IPC: G01F1/684 ,  G01F15/04 ,  G01K13/02 ,  G01F5/00 ,  F02D41/18

    Abstract: A thermal flowmeter includes a plurality of measuring units for stabilizing air flowing in a sub-passage, and improves noise performance or a pulsation characteristic of a flow rate sensor. The thermal flowmeter includes a flange fixed to an attachment part of a main passage, a sub-passage takes in a part of measured gas flowing in the main passage, a flow rate measuring unit measures a flow rate of the measured gas in the sub-passage, a circuit component controls the flow rate measuring unit, and the flow rate measuring unit and an electronic component are mounted on a circuit substrate. The sub-passage is formed in a substrate of the circuit substrate, the sub-passage on a surface side of the circuit substrate and a second space on a rear surface side are separated by the circuit substrate, and a pressure measuring unit and the circuit component are arranged in the second space.

    THERMAL FLOWMETER
    7.
    发明申请
    THERMAL FLOWMETER 审中-公开

    公开(公告)号：US20190162570A1

    公开(公告)日：2019-05-30

    申请号：US16092025

    申请日：2017-04-20

    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

    Inventor： Akira UENODAN ,  Tomoaki SAITO ,  Naoki SAITO ,  Masashi FUKAYA ,  Shinobu TASHIRO

    IPC: G01F1/684 ,  F02M35/10

    Abstract: Provided is a thermal flowmeter capable of reducing a measurement error during pulsation of a fluid as compared with that in the related art.The thermal flowmeter includes: a sub-passage 307 that takes a part of a gas 30 to be measured flowing through a main passage; and a flow measurement unit 451 disposed inside the sub-passage 307. The sub-passage 307 includes: a first passage 351 provided on a measurement surface 451a side of the flow measurement unit 451; a second passage 352 provided on a back surface 451b side of the flow measurement unit 451; and an inclined passage 361 provided on an upstream side of an inlet 351a of the first passage 351 in a forward flow direction F of the gas 30 to be measured in the first passage 351. The inclined passage 361 includes a first inclined surface 371, which is inclined from the second passage 352 side toward the first passage 351 side with respect to the forward flow direction F, to be closer to the second passage 352 side than the flow measurement unit 451.

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