公开(公告)号：US20230408316A1

公开(公告)日：2023-12-21

申请号：US18034319

申请日：2021-09-08

Applicant: Hitachi Astemo, Ltd.

Inventor： Nobuaki GORAI ,  Akira UENODAN ,  Naoki SAITO ,  Takahiro MIKI

IPC: G01F5/00 ,  G01F1/684

CPC classification number: G01F5/00 ,  G01F1/6842

Abstract: An object of the present invention is to provide a physical quantity detection device configured to reduce an influence of a resonance phenomenon of sound pressure on flow rate characteristics. The physical quantity detection device according to the present invention includes: a housing arranged in the main passage; a sub-passage arranged in the housing; a flow rate detection unit arranged in the sub-passage; a circuit unit electrically connected to the flow rate detection unit; a circuit chamber arranged in the housing and accommodating the circuit unit; and a first introduction passage including one end open to the sub-passage and the other end open to the circuit chamber to communicate between the sub-passage and the circuit chamber. The flow rate detection unit includes a diaphragm including a diaphragm front surface exposed to the sub-passage and a diaphragm rear surface exposed to a closed chamber that communicates with the circuit chamber, and the circuit chamber includes at least one or more protrusions arranged opposite an opening to which the other end of the first introduction passage is open.

公开(公告)号：US20220214198A1

公开(公告)日：2022-07-07

申请号：US17595331

申请日：2020-06-09

Applicant: Hitachi Astemo, Ltd.

Inventor： Akira UENODAN ,  Nobuaki GARAI ,  Shigeto HIROHATA ,  Naoki SAITO ,  Takahiro MIKI

IPC: G01F1/696 ,  G01F1/684

Abstract: An object is to improve measurement accuracy of a flow rate measurement device. A flow rate measurement device including: a first void which is formed of one surface of the support body and one surface of the circuit board; a second void which is formed of a surface opposite to the one surface of the circuit board and the housing; and a third void which is formed of a surface opposite to the one surface of the support body and a cover.

公开(公告)号：US20220318010A1

公开(公告)日：2022-10-06

申请号：US17628460

申请日：2020-07-14

Applicant: Hitachi Astemo, Ltd.

Inventor： Takahiro YAMAMOTO ,  Takahiro MIKI ,  Akira KOTABE

IPC: G06F9/30 ,  G06F9/355

Abstract: A physical quantity detection device that can improve arithmetic resolution while preventing an increase in memory capacity is obtained. A physical quantity detection device 100 according to the present invention includes: a physical quantity detection sensor that detects a physical quantity of a measurement target gas; a storage unit that records a correction amount corresponding to a detection value of the physical quantity detection sensor; and an arithmetic unit 110 that performs output adjustment of the detection value using the detection value and the correction amount. Resolution of the storage unit 120 is lower than arithmetic resolution of the arithmetic unit 110.

公开(公告)号：US20220099469A1

公开(公告)日：2022-03-31

申请号：US17416585

申请日：2020-01-21

Applicant: Hitachi Astemo, Ltd.

Inventor： Nozomi YATSUMONJI ,  Akira UENODAN ,  Takahiro MIKI ,  Hiroyuki ABE

IPC: G01F1/684 ,  G01F15/14

Abstract: Provided is a physical quantity detection device capable of electrically connecting with a neutralization region arranged at a place through which a measurement target gas passes in a simple process. A physical quantity detection device 300 of the invention includes a housing 301 having a terminal 303 and a passage portion 100 through which a measurement target gas passes, and a support body 600 that supports a flow rate detection element 601. A neutralization region 500 is formed on the bottom surface of the passage portion of the housing, and the support body is supported by the housing such that the detection unit of the flow rate detection element faces the neutralization region.

公开(公告)号：US20220074774A1

公开(公告)日：2022-03-10

申请号：US17422249

申请日：2020-01-23

Applicant: Hitachi Astemo, Ltd.

Inventor： Shigeto HIROHATA ,  Akira UENODAN ,  Nobuaki GORAI ,  Takahiro MIKI ,  Nozomi YATSUMONJI

IPC: G01F1/684 ,  G01F15/14

Abstract: Provided is a physical quantity detection device capable of achieving both rigidity improvement and sealability improvement. A physical quantity detection device (20) of the invention includes a housing (100), a cover (200), a chip package (310), and a flow rate sensor (311) supported by the chip package and arranged in a sub-passage. The housing includes: a first adhesive groove 160A which is an adhesive groove to which an adhesive for bonding the cover is applied, extends along a proximal end of the housing, extends in the protruding direction of the housing from the proximal end of the housing to a position on a more distal end side of the housing than the chip package, and is applied with the first adhesive 401; and a second adhesive groove 160B which extends along the sub-passage 134 and is applied with the second adhesive 402. The first adhesive has a higher Young's modulus, and the second adhesive has a higher thixotropy.

公开(公告)号：US20220390406A1

公开(公告)日：2022-12-08

申请号：US17775166

申请日：2020-10-20

Applicant: HITACHI ASTEMO, LTD.

Inventor： Eisaku FUKUCHI ,  Takahiro MIKI ,  Hiroaki HOSHIKA

IPC: G01N27/22

Abstract: A diagnostic function of a humidity sensor is exposed to the outside and the humidity sensor is likely to deteriorate.
An aspect of the present invention includes: a capacitance-voltage conversion circuit which includes a plurality of reference capacitors having different pieces of capacitance and a switch which switches the reference capacitors and outputs a voltage according to the capacitance of a humidity sensor; and a diagnosis unit which compares an output voltage of the capacitance-voltage conversion circuit with a reference voltage obtained from a reference characteristic of the humidity sensor and diagnoses the humidity sensor based on a comparison result. Also, the diagnosis unit changes the output voltage by changing the capacitance of the capacitance-voltage conversion circuit using the switch in a state in which the output voltage of the capacitance-voltage conversion circuit is within a certain range and compares the changed output voltage with the reference voltage.

公开(公告)号：US20220128389A1

公开(公告)日：2022-04-28

申请号：US17422795

申请日：2020-01-23

Applicant: Hitachi Astemo, Ltd.

Inventor： Akira UENODAN ,  Satoshi NODA ,  Naoki SAITO ,  Masamichi NAKAMURA ,  Takahiro MIKI ,  Nobuaki GORAI ,  Takayuki ISHIKAWA

IPC: G01F1/684

Abstract: Provided is a physical quantity detection device capable of improving noise performance of a flow rate detection unit as compared with the related art. The physical quantity detection device 20 includes a plate-like chip package 208 that is arranged to protrude from the flow path of the measurement target gas and has a width W along the flow direction of the measurement target gas. The chip package 208 includes a flow rate detection unit 205, an accelerating flow path 208c, a measurement surface 208a, a non-measurement surface 208b, and a separation flow portion 208d. The cross sectional area of the accelerating flow path 208c is reduced, and the flow rate detection unit 205 is arranged. The separation flow portion 208d partitions the second sub-passage 234b into a measurement flow path facing the measurement surface 208a and a non-measurement flow path facing the non-measurement surface 208b. In the width direction Dw of the chip package 208, the end portion 208ce of the accelerating flow path 208c and the end portion 208de of the separation flow portion 208d are separated from each other.

公开(公告)号：US20220307876A1

公开(公告)日：2022-09-29

申请号：US17595251

申请日：2020-06-12

Applicant: Hitachi Astemo, Ltd.

Inventor： Masamichi NAKAMURA ,  Akira UENODAN ,  Takahiro MIKI ,  Nobuaki GORAI ,  Naoki SAITO ,  Takayuki ISHIKAWA

IPC: G01F1/40

Abstract: In the physical quantity detection device, the occurrence of the measurement error is reduced by suppressing the flow bias in the sub-passage and reducing the resistance in the passage. A physical quantity detection device 30 of the present invention includes a measuring portion 310 disposed in a main passage, a sub-passage 330 that takes a gas to be measured from the main passage, a support member 603 that divides a part of the sub-passage into two flow paths of one surface side and the other surface side in a direction intersecting a passage width direction, and a flow rate detection element 602 disposed on one surface of the support member. The sub-passage includes a straight portion 321 in which the support member is disposed and a downstream curved portion 322 that is curved to one side in the passage width direction of the straight portion. The straight portion is provided with a dividing wall 500 that divides the flow path on the other surface side of the support member into two flow paths on one side and the other side in the passage width direction, and a cross-sectional area of the flow path on one side in the passage width direction is smaller than a cross-sectional area of the flow path on the other side in the passage width direction.

公开(公告)号：US20220074375A1

公开(公告)日：2022-03-10

申请号：US17414738

申请日：2020-02-07

Applicant: Hitachi Astemo, Ltd.

Inventor： Nobuaki GORAI ,  Takahiro MIKI ,  Akira UENODAN ,  Naoki SAITO

IPC: F02M35/10 ,  G01F1/688 ,  G01F1/684

Abstract: To obtain a physical quantity detection device capable of reducing an intake amount of air accompanied by foreign matter. A physical quantity detection device (20) of the invention includes a housing arranged in a main passage through which a measurement target gas (2) flows. The housing is provided with a second sub-passage (B) that takes in a part of the measurement target gas (2) flowing in the main passage, a circuit chamber (135) that accommodates a pressure sensor (320) that detects a pressure of the measurement target gas (2), and a pressure introduction passage (170) having one end opened in the middle of the second sub-passage (B) and the other end opened in the circuit chamber (135) and capable of introducing the pressure of the measurement target gas (2) from the second sub-passage (B) into the circuit chamber (135). In the pressure introduction passage (170), an introduction port (171) is arranged at a position offset outward from a side wall surface (152b) of the second sub-passage (B).

公开(公告)号：US20250012610A1

公开(公告)日：2025-01-09

申请号：US18711164

申请日：2021-11-30

Applicant: HITACHI ASTEMO, LTD.

Inventor： Nobuaki GORAI ,  Naoki SAITO ,  Akira UENODAN ,  Takahiro MIKI

IPC: G01F1/684

Abstract: A physical quantity detection device (20), which can be disposed in a main flow path (22a) where a measurement target gas (2) flows in one direction, includes: a circuit chamber (135a) that accommodates a circuit board (300); an inflow hole (220) that communicates the main flow path (22a) with the circuit chamber (135a) and allows the measurement target gas (2) flowing through the main flow path (22a) to flow into the circuit chamber (135a); an outflow hole (170) that communicates the main flow path (22a) with the circuit chamber (135a) and allows the measurement target gas (2) in the circuit chamber (135a) to flow out to the main flow path (22a); and a sensor (322) disposed in the circuit chamber (135a) to be at least partially located on a path (2a) of the measurement target gas (2) flowing from the inflow hole (220) to the outflow hole (170).