Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Daisuke Terada

Hiroshi Onuki

Noboru Tokuyasu

Yoshihiro Sukegawa

Takuya Aoyagi

Katsuaki Fukatsu

Kaori Kashio

Mizuki Shibata

Masamichi Yamada

Nobuyasu Kanekawa

Hiroaki Hoshika

Shoji Sasaki

Shiro Yamaoka

Jun Kubo

Tatsuya Miyake

Takashi Naitou

Hanae Shimokawa

Takeo Hosokawa

Tomonari Misawa

Shigenobu Komatsu

Kenji Nakabayashi

Ryo Ando

Junji Onozuka

Atsuo Soma

Toshiki Otsuki

Shosaku Ishihara

A pressure sensor which detects a combustion pressure of an engine includes: a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine; and a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure, wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine.

Pressure sensor

A noise resistance of a pressure sensor is improved while avoiding a hetero metal bonding. A pressure detection device includes a metal case having the diaphragm which is deformed due to a pressure received from a pressure medium, a sensor element which detects a pressure by detecting the deformation of the diaphragm, a lead frame which is electrically connected to the sensor element, and a connection member which holds the lead frame. A first surface of the lead frame, that is, the surface on a side near the metal case in the parallel plate region, and a second surface of the metal case, that is, the upper surface of the base member interpose at least one of the resin of the connection member being an insulator and the insulating adhesive and are disposed to face each other with a predetermined gap therebetween.

Pressure detection device with noise resistant pressure sensor

Provided is a physical quantity measurement device in which a bonding temperature of a bonding layer is lowered to a temperature not affecting an operation of a semiconductor chip and an insulating property of the semiconductor chip and a base is secured. The physical quantity measurement device includes a base (diaphragm), a semiconductor chip (strain detection element) to measure a physical quantity on the basis of stress acting on the base, and a bonding layer to bond the semiconductor chip to the base. The bonding layer has a first bonding layer bonded to the semiconductor chip, a second bonding layer bonded to the base, and an insulating base material disposed between the first bonding layer and the second bonding layer. The first and second bonding layers and contain glass. A thermal expansion coefficient of the first bonding layer is equal to or lower than a thermal expansion coefficient of the second bonding layer, a softening point of the second bonding layer is equal to or lower than a heat resistant temperature of the semiconductor chip, and a softening point of the first bonding layer is equal to or lower than the softening point of the second bonding layer.

Physical quantity measurement device, method for manufacturing same, and physical quantity measurement element

A semiconductor device includes a metal body; a bonding layer placed on the metal body; and a semiconductor chip placed on the bonding layer. The bonding layer includes a filler-containing first layer formed between the metal body and the semiconductor chip and a second layer bonded to the first layer and the semiconductor chip. The second layer has a thermal expansion coefficient higher than that of the first layer.

Semiconductor device, mechanical quantity measuring device, and semiconductor device fabricating method

A thermal-type flow meter for representing a flow rate of air by the frequency of a periodic signal, wherein abnormalities in the waveform of an output signal due to frequency variation is prevented while high-frequency noise is suppressed. The thermal-type flow meter pertaining to the present invention is provided with a plurality of switching elements connected in parallel, and varies a delay width between the switching elements in accordance with variation of the frequency of a periodic signal for representing a flow rate.

Thermal type flow meter

A control device for an engine, capable of accurately estimating the quantity of exhaust heat from the engine and performing engine control which improves the exhaust quality and fuel consumption of the engine in various operating conditions thereof, by using the accurate estimated value of the quantity of exhaust heat. A control device for an engine is provided with an exhaust flow rate sensor for directly sensing the flow rate of exhaust gas discharged from the engine, an exhaust temperature estimating device for sensing or estimating the temperature of the exhaust gas discharged from the engine, and an exhaust heat quantity estimating device for estimating, based on an output of the exhaust flow rate sensor and an output of the exhaust temperature estimating device, the quantity of heat of the exhaust gas discharged from the engine.

Control device for engine

A first sensor element outputs a first output signal in correspondence to a direction of the magnetic flux lines acting from the outside. A second sensor element outputs a second output signal associated with the first output signal in correspondence to a direction of the magnetic flux lines acting from the outside. A first conversion processing section converts the first output signal output from the first sensor element and the second output signal output from the second sensor element into the second physical quantity. A second conversion processing section converts the first output signal output from the first sensor element and the second output signal output from the second sensor element into a signal representing the rotation angle of the motor.

Physical quantity conversion sensor and motor control system using the same

A thermal gas-flow measuring instrument has a first heating resistor placed in the gas to be measured. A temperature sensing resistor is positioned upstream or downstream of the first heating resistor and generates signals relating to the flow rate. Between the first heating resistor and the support for supporting the first heating resistor is a second heating resistor that is electrically insulated from the first heating resistor. The second heating resistor suppresses the heat being transferred from the first heating resistor to the support. A control circuit controls the temperatures of the first heating resistor and the second heating resistor so that the operational temperature range of the second heating resistor or the temperature range at the joint section between the first heating resistor and the second heating resistor is at or above the temperature at which water droplets evaporate to disappear by film boiling.

Thermal type flow meter including a secondary heating device to suppress heat transfer

A flow rate measuring element of a thermal type flow sensor is placed in the fluid to be measured. The element includes: a first heating resistor for measuring a flow rate; a second heating resistor for heating a support for the first heating resistor; and current control circuits and which control heating resistor supply current so that the temperature of the second heating resistor is higher than the temperature of the first heating resistor.

Thermal type flow sensor having a second control circuit to control a second heating resistor above the first heating temperature

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Hitachinaka, Japan

Daisuke Terada