公开(公告)号：US20190162569A1

公开(公告)日：2019-05-30

申请号：US16248070

申请日：2019-01-15

Applicant: Hitachi Automotive Systems, Ltd.

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

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

Abstract: The present invention has been made to improve measurement accuracy of a thermal flow meter. In the thermal flow meter according to the invention, a circuit package (400) that measures a flow rate is molded in a first resin molding process. In a second resin molding process, a housing (302) having an inlet trench (351), a bypass passage trench on frontside (332), an outlet trench (353), and the like are formed through resin molding, and an outer circumferential surface of the circuit package (400) produced in the first resin molding process is enveloped by a resin in the second resin molding process to fix the circuit package (400) to the housing (302).

公开(公告)号：US20190137311A1

公开(公告)日：2019-05-09

申请号：US16307318

申请日：2017-06-14

Applicant: Hitachi Automotive Systems, Ltd.

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

IPC: G01F1/684 ,  F02D41/18 ,  G01F1/688 ,  G01F1/696

Abstract: The object of the invention is to obtain a thermal flowmeter which effectively causes water droplets to be directed to a discharge port when the water droplets adhered to a wall surface of a first passage are drawn into a third passage portion. A thermal flowmeter of the present invention includes a sub-passage that takes a measurement gas flowing through a main passage; and a flow detection unit that measures a flow rate of the measurement gas by performing heat transfer with the measurement gas flowing through a sub-passage. Further, the sub-passage includes a first passage, a second passage portion branching in the middle of the first passage portion to be directed toward the flow detection unit; and a third passage portion branching in the middle of the second passage portion to be directed toward a third outlet, and a pressure loss generation means is provided between a third inlet and the third outlet of the third passage portion.

公开(公告)号：US20190128716A1

公开(公告)日：2019-05-02

申请号：US16092644

申请日：2017-06-05

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Kazunori SUZUKI ,  Akira UENODAN ,  Junichi HORIE

IPC: G01F1/684 ,  G01M15/04

Abstract: The present invention is directed to a thermal flowmeter that prevents erroneous detection of backflow by suppressing circulation of air flow from a flow detection unit side to a back side or from the back side to the flow detection unit side and measures a gas flow rate with high accuracy. A thermal flowmeter of the present invention includes a bypass passage through which a gas to be measured passes; a dividing portion which divides the inside of the bypass passage into a first passage portion and a second passage portion; and a flow detection unit which is provided on a surface of the dividing portion on the first passage portion side and detects a flow rate of the gas to be measured. Further, the first passage portion has a detection surface on which the flow detection unit is exposed, an opposing surface which opposes the flow detection unit on the detection surface, and non-opposing surfaces and which are disposed at positions deviating from the opposing surface in a bypass passage width direction of the first passage portion and do not oppose the flow detection unit, and the non-opposing surface is separated from the detection surface farther than the opposing surface.

公开(公告)号：US20180306619A1

公开(公告)日：2018-10-25

申请号：US15770993

申请日：2016-10-05

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Akira UENODAN ,  Shinobu TASHIRO ,  Takeshi MORINO ,  Masatoshi OGATA ,  Tsubasa WATANABE ,  Norio ISHITSUKA

IPC: G01F1/684

Abstract: To obtain a flow meter with which it is possible to facilitate establishing an electrical connection with a conductor exposed in a location through which a gas to be measured passes. A flow meter that is provided with a lead and a circuit component placed on the lead, and that has a package in which part of the lead is molded from a resin, wherein the package is provided with an exposure portion for exposing part of the lead from the resin member, the exposure portion being electrically connected to a conductor that constitutes part of an auxiliary passage.

公开(公告)号：US20170363455A1

公开(公告)日：2017-12-21

申请号：US15696860

申请日：2017-09-06

Applicant: Hitachi Automotive Systems, Ltd.

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

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

CPC classification number: G01F1/684 ,  G01F1/6842 ,  G01F1/6845 ,  G01F1/6965 ,  G01F15/14

Abstract: The present invention has been made to improve measurement accuracy of a thermal flow meter. In the thermal flow meter according to the invention, a circuit package (400) that measures a flow rate is molded in a first resin molding process. In a second resin molding process, a housing (302) having an inlet trench (351), a bypass passage trench on frontside (332), an outlet trench (353), and the like are formed through resin molding, and an outer circumferential surface of the circuit package (400) produced in the first resin molding process is enveloped by a resin in the second resin molding process to fix the circuit package (400) to the housing (302).