Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi Koki Co., Ltd.

Noboru Tokuyasu

Shinobu Tashiro

Keiji Hanzawa

Takeshi Morino

Toshiharu Nogi

Takuya Shiraishi

Yoko Nakayama

Minoru Ohsuga

Akira Uenodan

Ryosuke Doi

Yoshihiro Sukegawa

Tsutomu Kono

Hiroaki Hoshika

Yusuke Kihara

Kaori Kashio

Atsushi Inoue

Shiro Yamaoka

Katsuaki Fukatsu

Yoichi Iihoshi

Minoru Oosuga

Yuki Okamoto

Daisuke Terada

Takahiro Miki

Takayuki Yogo

Jun Kubo

Norio Ishitsuka

Tsubasa Watanabe

Binti Haridan Fatin Farhanah

Masatoshi Ogata

Toshiki Otsuki

Masamichi Yamada

Hiroshi Fujii

Takashi Yoshida

Shinya Igarashi

Yutaka Takaku

Susumu Tateyama

Takanobu Ichihara

Mineo Kashiwaya

Junichi Yamaguchi

Hisao Okada

Takao Kumasaka

Yuzuru Simazaki

Hidefumi Iwaki

Hiroshi Onuki

Motoyuki Miyata

Akira Takasago

Tomoaki Saito

Hiroki Nakatsuchi

Takashi Kadohiro

Eiichiro Ohata

Masayuki Satou

Takanori Kokubu

Mituharu Osaka

Toshiki Ohtsuki

Shirou Yamaoka

An object of the present invention is to provide a compact air flow rate measuring device with improved stain resistance. A physical quantity detecting device of the present invention includes: a semiconductor element having a flow rate detection unit; a circuit boardsupporting the semiconductor element; and a conductive coverfixing the circuit board, and the semiconductor element is fixed to the circuit boardsuch that the flow rate detection unitfaces the cover

Flow rate detecting device of intake air in an internal combustion engine

A compact physical quantity detecting device is provided since it is possible to lower the mounting height of a chip package by accommodating the chip package in a notched board. In the physical quantity detecting device of the present invention, a part in a thickness direction of a support body on which a flow rate detection unit and a processing unit are mounted is accommodated in a notch provided in a printed board.

Physical quantity detection device

Provided is a thermal flowmeter that can achieve both measurement accuracy and antifouling performance with a simple and space-saving passage structure. In the thermal flowmeter of the invention, a housing is disposed in a main passage through which a gas to be measured flows, and the gas to be measured is taken from the main passage into an auxiliary passage provided in a housing, and a flow rate detection unit disposed in the auxiliary passage measures a flow rate of the gas to be measured. The auxiliary passage includes an inlet opening that opens to be inclined with respect to the main flow direction of the gas to be measured flowing through the main passage, and an inclined passage that extends in a direction inclined with respect to the main flow direction of the gas to be measured flowing from the inlet opening through the main passage.

Thermal flowmeter

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 () that measures a flow rate is molded in a first resin molding process. In a second resin molding process, a housing () having an inlet trench (), a bypass passage trench on frontside (), an outlet trench (), and the like are formed through resin molding, and an outer circumferential surface of the circuit package () produced in the first resin molding process is enveloped by a resin in the second resin molding process to fix the circuit package () to the housing ().

Thermal flow meter including a cover mounted on a housing and where a bypass passage is formed by the cover and a bypass passage trench

In order to provide a flow measuring device high in thermal responsiveness, the flow measuring device includes a temperature detecting elementfor temperature detection, and a conductive metal lead framethat supports and fixes the temperature detecting element. Of the metal lead frame, a part of the metal lead frame mounted with the temperature detecting element has a portion which is thinner than the thickness of the other metal lead frame or narrower than the width of the other metal lead frame.

Thermal airflow measuring device

A thermal flowmeter circuit package having a side of a measurement surfaceof the circuit package and a flow pathat a side of the backside of measurement surfaceof a rear surface of the measurement surface, and an inflow-side end surface of the circuit package for dividing the measurement target gashas 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 gasis formed with a reference linedividing the measurement target gas, and an end surfaceat the side of the measurement surface with respect to the reference line and an end surfaceat the side of the backside of measurement surface with respect to the reference line are formed to be asymmetrical.

Thermal flow meter with an asymmetrical inflow-side of circuit package

A thermal-type flowmeter includes a chip package. The chip package is formed through encapsulation with a resin of a sensor element, a drive circuit, a metal lead frame adapted to have mounted thereon the sensor element and the drive circuit, and a temperature detecting element. The chip package has an exposed structure in which a surface of the sensor element having the diaphragm is exposed. The temperature detecting element is mounted on the lead frame via an electrically conductive member.

Thermal flow meter

Provided is a thermal flow meter to improve the measurement accuracy of a temperature detector. The thermal flow meter includes a bypass passage through which a measurement target gas flowing through a main passage flows, and a circuit package which includes a measurement circuit for measuring a flow rate of the measurement target gas flowing through the bypass passage and a temperature detecting portion for detecting a temperature of the measurement target gas. The circuit package includes a circuit package body which is molded by a resin to internally envelope the measurement circuit and a protrusion molded by the resin. The temperature detecting portion is provided in the leading end portion of the protrusion, and at least the leading end portion of the protrusion protrudes to the outside from a housing.

Thermal flow meter with a case having an external terminal for outputting an electric signal

To obtain a thermal flow meter capable of providing thermal insulation without degrading responsiveness of a temperature detection element. A thermal flow meterof the present invention includes an air flow sensing portionthat detects a flow rate by performing heat transfer with a measurement target gas passing through the main passageusing a heat transfer surface, a temperature detection elementthat detects a temperature of the measurement target gas, a circuit packageobtained by connecting a processing unitthat processes signals of the air flow sensing portionand the temperature detection elementto a lead and sealing the processing unitusing a first molding resin through a first molding process, and a housingwhere the circuit packageis fixed using a second molding resin through a second molding process, wherein, in the circuit package, a thickness of a temperature detecting portionfor sealing the temperature detection elementis thinner than that of a package body portionfor sealing the processing unit

Thermal flow meter with thin resin portion sealing temperature detection element

Thermal flow meter including a cover mounted on a housing and where a bypass passage is formed by the cover and bypass passage trench

A thermal flow meter capable of measuring flow rates of a gas flowing in a forward direction and a backward direction with a high degree of accuracy is provided. A thermal flow meteraccording to the present invention includes a bypass passage configured to retrieve and flow a measurement target gasreceived from a main passageand a flow rate measurement circuitconfigured to measure a flow rate by performing heat transfer with the measurement target gas flowing in the bypass passage. In an outlet port side chamberprovided at an upstream with respect to an outlet portof the bypass passage which is formed to be open in a downstream direction in a flow direction of the measurement target gas, a guideis provided to oppose the outlet port to change a direction of a flow of the measurement target gas flowing in from the opposite side, and the outlet port and an inflow unit of the outlet port side chamber are arranged to be eccentric when they are seen in a direction along the flow direction of the measurement target gas flowing in the main passage.

Thermal flow meter capable of measuring flow rates in forward flow and reverse flow directions

In a thermal flow meter that can simplify a manufacturing process and that has high measurement accuracy, a circuit package includes a passage portion, in which an air flow sensing portion is arranged, and a processing unit, in which a circuit is arranged. The circuit package is fixed to a fixing portion integrally formed with the circuit package, and the passage portion of the circuit package is held in a bypass passage. At least a portion of an end spaced apart from a fixing wall of the passage portion of the circuit package is exposed in the bypass passage.

Provided is a thermal flow meter through which a measurement with high accuracy and has a discharge function. In a thermal flow meterof the invention, a part of a measurement target gasflowing through the main passageflows into a bypass passage. A drainage passageis provided in the bypass passage to communicate a bypass passageon the inlet port (between the inlet portand the measurement surfaceserving as the air flow sensing portion) and a bypass passageon the outlet port (between the measurement surfaceserving as the air flow sensing portion and the outlet port). The drainage passageincludes a through hole. The through holeincludes an inlet portwhich penetrates a wall surfaceforming the bypass passageon the inlet port and is opened in the bypass passageon the inlet port, and an outlet portwhich is opened in a rear surfaceof the wall surface. Waterflowing into the bypass passage is guided to the through hole, and guided to the bypass passageon the outlet port through the drainage passage, and discharged to the main passage. Therefore, an influence of the water flowing into a measuring portion can be reduced, and the measurement accuracy can be improved.

Thermal flow meter with drainage passage at inlet of bypass passage

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Hitachinaka, Japan

Noboru Tokuyasu