Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Takayuki Yogo

Hiroaki Hoshika

Takahiro Miki

Hiroyuki Abe

Takayuki Saito

Yuki Isoya

Binti Haridan Fatin Farhanah

Akira Uenodan

Takeo Hosokawa

Tsubasa Watanabe

Shinya Igarashi

Tsutomu Kono

Keiji Hanzawa

Shinobu Tashiro

Norio Ishitsuka

Takahiro Yamamoto

Noboru Tokuyasu

Chihiro Kobayashi

Naoki Saito

Hiromu Kikawa

Masatoshi Ogata

Nozomi Yatsumonji

Mizuki Ijuin

Izumi Watanabe

Yasuo Onose

Hiroki Nakatsuchi

Ryotaro Shimada

Mizuki Shibata

Satoshi Ikeo

Isao Okazaki

Yuta Chiba

The objective of the present invention is to obtain a flow rate measurement device capable of reducing variations in the flow rate detection accuracy by suppressing the inclination of a chip package relative to a circuit board. A flow rate measurement deviceof the present invention includes a chip packagehaving a flow rate sensorand a passage wallformed therein, and a circuit boardon which the chip packageis mounted, in which the chip packageis mounted such that the flow rate sensorfaces a portion of the circuit boardand a portion of the passage wallas a resin portion of the chip packagecontacts the circuit board

Flow rate measurement device

To provide an airflow amount measuring device capable of accurately measuring a flow amount of air without occurrence of warpage in a thin film portion when an airflow measuring element is mounted on a lead frame to form a resin-sealed package in which the airflow amount measuring element and the lead frame are sealed. A chip package includes a lead frame, an element mounted on the lead frame and having a detection portion, and a structure for sealing the lead frame and the element such that at least the detection portion is exposed. Then, the curvature radius ρ of the exposed portion of the element exposed from the sealing resin member is 2.13 or less.

Airflow amount measuring device

To obtain a chip package positioning structure capable of adjusting a tilt and a position of a chip package with respect to the circuit board and reducing mounting variations. The chip package positioning and fixing structure that positions and fixes, to a circuit board, a chip packagein which a flow rate detection elementis sealed with a resin so that a detection portion is at least exposed, in which the chip package includes a solder fixation portionthat fixes the chip package to the circuit board by soldering, and a positioning portionthat performs positioning to the circuit board, and the positioning portion is provided closer to the flow rate detection element from the solder fixation portion.

Chip package positioning and fixing structure

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

Provided is a highly reliable thermal flow meter. In a thermal flow meter, a flow rate detection elementthat detects an air flow rate, and a conductive coating filmcontaining a conductive substance and a resin as constituent elements are provided on at least a part of a portion provided in an auxiliary passageon a surface facing a detection surfaceof the flow rate detection element

Thermal flow meter

A physical quantity measurement device is configured to seal a cavity portion on a back surface side of a diaphragm of a thermal air flow rate sensor while improving measurement accuracy. The device may include a lead frame having a mounting surface on which a flow rate sensor which is the thermal air flow rate sensor is mounted, and a flow passage forming member disposed on a back surface opposite to the mounting surface of the lead frame. A ventilation flow path is formed by a first through hole in communication with a cavity portion of the flow rate sensor, a second through hole provided in the lead frame and opened in the mounting surface, and a connection flow path that is defined between the lead frame and the flow passage forming member and connecting the first through hole and the second through hole.

Physical quantity measurement device including a thermal flow rate sensor with a ventilation flow path

An object is to improve measurement accuracy of a thermal air flow meter. A flow-rate measuring device comprising: a sensor assembly having a flow-rate detecting element; a circuit board on which the sensor assembly is mounted; and a housing on which the circuit board is mounted, wherein the sensor assembly is mounted on the circuit board such that a detection portion side of the flow-rate detecting element is closer to the housing, and the sensor assembly includes a contact portion in contact with the housing on the detection portion side.

Flow-rate measuring device

A flow-volume detecting apparatus including a flow-volume detecting unit which measures a flow volume of a measured fluid, a flow-volume state determining unit which determines a flow-volume state of the measured fluid based on an output from the flow-volume detecting unit. The flow-volume detecting apparatus further including a plurality of filters which process a flow-volume signal, and a filter selecting unit which selects a filter that processes the flow-volume signal, wherein the filter selecting unit selects the filter that processes the flow-volume signal according to the flow-volume state determined by the flow-volume state determining unit.

Flow-volume detecting apparatus utilizing filter selection

A flow-rate sensor is provided with a lead frame, a semiconductor chip that is disposed on one surface of the lead frame, and in which a diaphragm including a void portion on the lead frame side is formed, a flow rate detecting unit that is formed on the one surface including the diaphragm of the semiconductor chip, and resin that includes a flow passage opening portion exposing at least a portion of the flow rate detecting unit formed on the diaphragm, and covers the lead frame and the semiconductor chip. A lower side resin portion of the resin covering another surface side of the lead frame, on an opposite side to the one surface side thereof, has a thinned portion that is thinner than a periphery thereof in a region facing a peripheral edge portion of the diaphragm.

Flow-rate sensor

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.

Physical quantity detection device

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.

To obtain a physical quantity detection device that can prevent a thermal influence on a sensor due to downsizing. A physical quantity detection deviceof the present invention includes a measuring unitprotruding from an inner wall of a main passagetoward a passage center of the main passage. The physical quantity detection deviceincludes at least one of a flow sensorthat detects a flow rate of a measured gas, an intake air temperature sensorthat detects temperature, a pressure sensorthat detects pressure, and a humidity sensorthat detects humidity, and the sensors are disposed along a protruding direction of the measuring unit

A decrease in the accuracy after switching of the heating state can be reduced. The physical quantity detecting device includes: a flow rate detecting unit configured to include a heating element to measure a flow rate of a fluid to be measured; a heating element control unit configured to switch a control state of the heating element to any one of a heating state and a heating suppression state; and a signal processing unit configured to process a measured value of the flow rate detecting unit. When the heating element control unit switches the control state, the signal processing unit processes an estimated value determined based on a measured value of the flow rate detecting unit before the switching for a predetermined period immediately after the switching.

Physical quantity detecting device

Provided is a thermal-type flowmeter which can prevent a reduction of flow rate accuracy and reliability, and an increase of cost of the thermal-type flowmeter compared to the related art, and can add a function of an electrostatic scattering mechanism. The thermal-type flowmeter of the present invention includes a sub-passage into which part of a measurement target gas flowing in a main passage is taken, a flow rate detection element of a flow measurement unit which is disposed in the sub-passage, a circuit package which supports the flow rate detection element, and a substrate to which the circuit package is fixed. The flow rate detection element includes a detection surface to detect a flow rate of the measurement target gas. The detection surface is disposed to face the circuit substrate.

Thermal-type flowmeter

A physical quantity detecting device includes a circuit board having a first support portion with a physical quantity detecting element, a second support portion with a temperature detecting element, and a housing molded by injection molding, the housing supporting the circuit board. The physical quantity detecting element is configured to detect a physical quantity of fluid and the temperature detecting element is configured to detect a temperature of the fluid. The second support portion protrudes from an edge of the circuit and has a third support portion supporting the second support portion in connection with the housing. The third support portion is located on a same side as the leading end portion, with respect to a base end portion, and located on a same side as the base end portion, with respect to an implementation portion on which the temperature detecting element is implemented.

Growing community of inventors

Hitachinaka, Japan

Takayuki Yogo