Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Hitachi Astemo Ltd.

Hiroaki Hoshika

Takayuki Yogo

Takahiro Miki

Noboru Tokuyasu

Takeo Hosokawa

Yuki Isoya

Yoshihiro Sukegawa

Tsubasa Watanabe

Kaori Kashio

Shiro Yamaoka

Akira Uenodan

Tsutomu Kono

Takahiro Yamamoto

Masahiro Matsumoto

Hiroshi Nakano

Takayuki Saito

Naoki Saito

Yasuo Onose

Hiroyuki Abe

Binti Haridan Fatin Farhanah

Eiichiro Ohata

Keiji Hanzawa

Shinobu Tashiro

Jun Kubo

Norio Ishitsuka

Takanobu Ichihara

Kazuhiko Kanetoshi

Daisuke Terada

Masatoshi Ogata

Kouzou Katogi

Nozomi Yatsumonji

Toshiki Otsuki

Mituharu Osaka

Toshiki Ohtsuki

Takanori Kokubu

It is possible to reduce a degradation in accuracy after switching of a heating state or after change of the flow rate. A physical quantity detection device includes a flow rate measuring element which is equipped with a heating element and measures a flow rate of a measurement target fluid; a heating element control unit which switches a control state of the heating element to one of a heat generation state or a heat generation suppression state; and a signal processing unit which includes a buffer and a frequency analysis block, and processes a measured value of the flow rate measuring element, using a main frequency calculated by the frequency analysis block, in which the measured value for a past predetermined period is recorded in the buffer, the frequency analysis block calculates the main frequency by performing a frequency analysis of the measured value recorded in the buffer, when an occurrence of an event is detected, the signal processing unit performs a calculation, using the main frequency calculated immediately before for a predetermined period from the occurrence of the event, and the event is a sudden change in the measured value and switching of the control state performed by the heating element control unit.

Physical quantity detection device

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 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

Provided is a physical quantity measurement device capable of reducing a frequency analysis error of a gas flow rate as compared with the related art. A physical quantity measurement deviceincludes a flow rate sensorand a signal processing unit. The signal processing unithas a buffer, an offset adjustment unit, a gain calculation unit, a correction calculation unit, and a frequency analysis unit. The bufferstores a flow rate data based on an output signal of the flow rate sensorfor a predetermined period. The offset adjustment unitadjusts the zero point of the flow rate waveform. The gain calculation unitcalculates a correction gain of the flow rate waveform whose zero point has been adjusted. The correction calculation unitperforms the correction by multiplying the flow rate waveform whose zero point has been adjusted by the correction gain. The frequency analysis unitperforms a frequency analysis calculation of the corrected flow rate waveform and stores the data obtained by the calculation in the buffer. The gain calculation unitcalculates the correction gain at which the overflow does not occur in the frequency analysis unit

Physical quantity measurement 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.

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.

An object of the present invention is to provide a gas sensor device capable of detecting a temporal change with high accuracy and maintaining measurement accuracy over a long period under a temperature environment susceptible to a complicated and wide range of change. The gas sensor device includes: heat insulating filmsandformed on a substrate; a first heaterprovided on the heat insulating filmsandand configured to measure physical quantity of gas; and a reference resistorformed in a resistive layer same as the first heater and formed on the heat insulating filmsand. The gas sensor device further includes a second heaterthat simultaneously heats the first heaterand the reference resistor

Gas sensor device

To obtain a physical quantity detection apparatus that can reduce the outer shape of a housing in size. A physical quantity detection apparatusdetects a plurality of physical quantities of gasto be measured flowing in a main passage. The physical quantity detection apparatushas a housingdisposed in the main passage, a circuit substrateinsert molded in the housing, and a plurality of detection sensors, andeach mounted on each of one face and the other face of the circuit substrate

Physical quantity detection apparatus and electronic apparatus

A sensor device includes a detection resistor having a resistance value changing according to a physical quantity and a reference resistor compared with the detection resistor, the reference resistor is configured by electrically connecting a first resistance circuit and a second resistance circuit. The first resistance circuit includes a first and a second resistive element having positive and negative resistance temperature coefficients, respectively, which are electrically connected. The second resistance circuit includes a third and a fourth resistive elements having a positive and a negative resistance temperature coefficient, respectively, which are electrically connected. The first resistance circuit is configured to generate a first deviation to either the positive or negative side with respect to a temperature change, and the second resistance circuit is configured to generate a second deviation to the side opposite to the positive or negative side where the first deviation is generated.

Sensor device

The purpose of the present invention is to reduce a load of preventing dew condensation, and to provide a highly reliable humidity detection device. In order to achieve the purpose, this humidity detection device is provided with: a humidity sensor having a humidity detection unit and a temperature detection unit; a heating resistor that heats the humidity sensor; and a heating control unit that controls a heating temperature of the heating resistor. The humidity detection device is characterized in having a target temperature storage unit that stores target temperatures of the heating resistor, said target temperatures having been determined corresponding to temperatures and humidities.

Humidity detection device

The purpose is to improve the measurement accuracy of a thermal air flow meter. The device has: an auxiliary passage for entraining a portion of a fluid being measured; a sensor chip arranged in the auxiliary passage, for measuring the flow rate of the fluid being measured; an electronic component having an internal resistor, for converting the fluid flow rate detected by the sensor chip to an electrical signal; and a substrate on which the sensor chip and the electronic component are mounted. The substrate is covered by a filler material, on the surface of which the electronic component is mounted.

Thermal air flow meter

An air flow rate measurement device capable of suppressing disturbance of a flow of measured gas and reducing a characteristic influence due to water droplets flowing with intake air is realized. An edgeof the upstream side where air flows in a circuit boardon which a flow rate detection portionis mounted is provided with a segmentation portionto be a semicircular notch structure to segment the edge. Water droplets flowing with measured gascan be captured by the segmentation portionto inhibit the water droplets from arriving at the flow rate detection portion

Air flow rate measurement device having a segmented board portion at an upstream side to suppress flow disturbances

A physical quantity detection device includes: a housing; a circuit board; a resin material which covers the circuit board; a cover which forms a circuit chamber in which the circuit board is disposed and a flow path through which a gas to be measured passes together with the housing; and a conductor which is disposed to be exposed to the flow path, in which the conductor and the circuit board are electrically connected to each other.

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Hitachinaka, Japan

Hiroaki Hoshika