Abstract: In order to improve sensor characteristics and minimize variation in said characteristics, a pressure sensor is positioned upstream of a humidity sensor so as to help prevent water from contacting the humidity sensor and dust from adhering to the humidity sensor. This physical-quantity detection device 300 is characterized by having a detection unit 422 that detects humidity, a detection unit 421 that detects pressure, a circuit board 400 that has an electronic circuit that processes detection signals, and a housing 302 that accommodates the circuit board 400. The physical-quantity detection device 300 is also characterized in that the detection units 422, 421 are laid out on the surface of the circuit board 400 in a straight line in the direction in which a gas being measured flows, with the detection unit 421 that detects pressure positioned upstream of the detection unit 422 that detects humidity.

Abstract: The purpose of this invention is to obtain a physical-quantity detection device, the external shape of the housing of which can be reduced in size. Said physical-quantity detection device, which detects a plurality of physical quantities of a gas being measured that flows through a main channel, is characterized by having a housing positioned inside said main channel, a circuit board insert-molded into said housing, and a plurality of detection sensors mounted on both sides of the circuit board.

Abstract: The present invention reduces, by optimizing disposition of components on an electronic circuit board, heat transfer from other components mounted on the same board, and improves measurement accuracy of an intake air temperature detection element. A physical quantity detection device of the present invention has an electronic circuit board, which is provided with one or more intake air temperature detection elements (elements having intake air temperature detection function), and which processes electric signals. Furthermore, the physical quantity detection device has a configuration wherein the intake air temperature detection elements, and a power supply regulator having the maximum heat generation quantity are mounted on the same electronic circuit board. The physical quantity detection device is characterized in that the intake air temperature detection elements are disposed on the air flow upstream side of the power supply regulator.

Abstract: In order to provide a highly precise and highly responsive humidity detection means with which diagnosis is easy, this control device for an internal combustion engine is characterized in that two or more sensors for detecting the humidity of the atmosphere or a gas mixed with the atmosphere are provided in the middle of the flow in an intake air passage of the internal combustion engine, at least one of these sensors being a relative humidity sensor for detecting the relative humidity, at least one other of the sensors being an absolute humidity sensor for detecting the absolute humidity, and the relative humidity sensor being arranged upstream from the absolute humidity sensor.

Abstract: The objective of the present invention is to provide an air flow rate detecting device with which the inflow of air to the reverse surface of a diaphragm is reduced, while stresses acting on a flow rate detecting unit are alleviated and variability in the mounting of the flow rate detecting unit is reduced. This air flow rate measuring device comprises: a flow rate detecting unit including a diaphragm which detects the air flow rate of a gas being measured; a circuit board on which the flow rate detecting unit is mounted; and a housing which accommodates the circuit board. The flow rate detecting unit and the circuit board are secured to one another using a sheet-like adhesive, and are secured in such a way that a surface of the flow rate detecting unit that is perpendicular to the direction of flow is sealed by means of a resilient body, and a surface of the flow rate detecting unit that is parallel to the direction of flow is open.

Abstract: The purpose is to enhance the measurement stability of a flow rate detection unit in a physical quantity detection device by branching an auxiliary passage in which the flow rate detection unit is disposed into first to third passages and providing the third flow passage at an upstream part of the second flow passage. A physical quantity detection device has a circuit board provided with at least one detection unit for detecting the physical quantity of a gas flowing through a main passage and a circuit unit for computational processing of the physical quantity detected by the detection unit, a housing for accommodating the circuit board, a cover fixed to the housing, and an auxiliary passage formed by both the housing and cover that is configured to branch passages from a first passage to a third passage.

Abstract: In a module in which a circuit board is integrally insert molded with a housing while semiconductor parts mounted on the circuit board are exposed, deformation of the circuit board caused by pressure on the circuit board by a mold for blocking the molding resin is reduced. In the module in which the circuit board is integrally insert molded with the housing while the semiconductor parts mounted on the circuit board are exposed, the deformation of the circuit board is reduced by placing a material, which has an elastic modulus smaller than the elastic modulus of the printed circuit board, in the projection area of the mold holding portion on the circuit board.

Abstract: The purpose of the present invention is to enhance the detection accuracy of an absolute humidity determined from at least temperature and relative humidity when carrying out temperature control using a heating element according to detection characteristics for temperature and relative humidity. A physical quantity detection device according to the present invention is provided with a humidity sensor for detecting relative humidity and temperature, a heater for heating the humidity sensor, and a microcomputer and controls the heat generation amount of the heater by using the heater for heating and stopping heating such that an environment under measurement is at least a room temperature and is a temperature at which a relative humidity detection characteristic and temperature detection characteristic for the humidity sensor improve, thereby enhancing the accuracy of absolute humidity detection.

Abstract: To prevent a circuit board and circuit board wiring from being damaged at the time of assembling a physical quantity detection device. A physical quantity detection device of the present invention is characterized by having, on a circuit board, a sensor unit wherein a flow rate detection unit is disposed, a circuit unit wherein a circuit element is disposed, and a partitioning wall that partitions the sensor unit and the circuit unit from each other. The physical quantity detection device is also characterized in that an internal layer conductor for electrically connecting the flow rate detection unit and the circuit unit to each other is provided on a circuit board internal layer where the partitioning wall is positioned.

Abstract: To achieve a physical quantity detection device capable of obtaining a desired overall device accuracy without unnecessarily raising the tolerances of detection elements, the present invention is characterized by having a plurality of physical quantity detection units for respectively detecting plurality of physical quantities, a storage unit for storing the error characteristics of individual physical quantity detection units, a physical quantity calculation unit for using at least two physical quantities detected by at least two of the plurality of physical quantity detection units to calculate a separate physical quantity, and an error calculation unit for reading the error characteristics of the plurality of physical quantity detection units from the storage unit and calculating the error of the separate physical quantity.

Abstract: A resin molding includes a semiconductor element, a circuit board, and a resin. A conductor connected to the semiconductor element is formed on the circuit board. The resin is adhered and integrated with the circuit board. A resin leakage suppression layer including a material having a higher thermal conductivity than that of a material forming a surface layer of the circuit board is provided in an edge region extending along a portion adhered to the resin in the circuit board and extending along at least one-side side surface of the resin.

Abstract: A humidity measuring device includes an apparatus that determines whether or not a water droplet adheres to a surface of a sensor element which detects the humidity, based on changes in humidity and temperature of the intake air. The apparatus calculates a determination value based on a rate of change of the temperature and a rate of change of relative humidity. The apparatus also compares the determination value with a threshold. The apparatus also determines that a water droplet adheres to the surface of the sensor element when a state where the determination value is larger than the threshold continues for a determination time or longer.

Abstract: To obtain a physical quantity detection apparatus that can reduce the outer shape of a housing in size. A physical quantity detection apparatus 300 detects a plurality of physical quantities of gas 30 to be measured flowing in a main passage 124. The physical quantity detection apparatus 300 has a housing 302 disposed in the main passage 124, a circuit substrate 400 insert molded in the housing 302, and a plurality of detection sensors 452, 453, 454, 455, and 456 each mounted on each of one face and the other face of the circuit substrate 400.

Abstract: The present invention obtains a humidity measuring device capable of performing self-diagnosis with high reliability. This humidity measuring device 20 has a diagnosis processing unit 25 for performing self-diagnosis by using gas temperatures and gas humidities before and after a gas in an ambient atmosphere to be measured is heat-controlled. The diagnosis processing unit has a diagnosis start determining unit 26 for determining whether the self-diagnosis can be started on the basis of an exchange state in the ambient atmosphere to be measured and the gas temperature and the gas humidity before the gas in the ambient atmosphere to be measured is heat-controlled, and a diagnosis continuation determining unit 28 for determining whether the self-diagnosis can be continued on the basis of the gas temperature and the gas humidity that are heat-controlled during the self-diagnosis.

Abstract: A physical quantity measuring device includes a chip package and a casing. The casing fixedly stores the chip package. The casing includes a first bypass passage allowing a gas to be measured taken from a main passage, to flow in a first measuring unit, and a second bypass passage allowing the gas to be measured taken from the main passage, to flow in a second measuring unit. The chip package is configured to dispose a signal processing unit between the first and second measuring units. The casing has a cooling unit that allows the gas to be measured from the main passage to flow between the first measuring unit and the second measuring unit, and cooling the signal processing unit.

Abstract: To improve measurement stability of a flow rate detection unit in a physical quantity detection device, a periphery of a synthetic resin material is provided with a protruding section protruding to a cover side. A physical quantity detection device includes a housing, a front cover fixed to the housing, a circuit board housed in the housing, a flow rate detection unit that detects, in a sub-path, the flow rate of a gas to be measured by being attached to the circuit board, a connecting wire that electrically connects the flow rate detection unit to the circuit board, and a synthetic resin material that seals a connecting wire-included connection portion between the circuit board and the flow rate detection unit, the front cover having a protruding section covering at least a part of the synthetic resin material by protruding into the sub-path.

Abstract: The purpose of this invention obtain a physical-quantity detection device, the external shape of the housing of which can be reduced in size. Said physical-quantity detection device, which detects a plurality of physical quantities of a gas being measured that flows through a main channel, is characterized by having a housing positioned inside said main channel, a circuit board insert-molded into said housing, and a plurality of detection sensors mounted on both sides of the circuit board.

Abstract: 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.

Abstract: In order to improve the characteristic precision of a sensor, an electronic circuit board on which a detection unit that measures a physical quantity is mounted is integrally formed together with a housing so as to reduce mounting variability. This physical-quantity detection device 300 is characterized by having a circuit board 400 and a housing 302 that accommodates said circuit board 400, wherein the circuit board 400 is provided with one or more detection units 602 that detect physical quantities of a gas being measured 30 that passes through a main channel 124, the circuit board 400 is also provided with a circuit unit that performs a computation on the physical quantity detected by each detection unit 602, the housing 302 is formed from a molded resin, and the circuit board 400 is integrally formed together with the housing 302.

Abstract: In order to improve sensor characteristics and minimize variation in said characteristics, a pressure sensor is positioned upstream of a humidity sensor so as to help prevent water from contacting the humidity sensor and dust from adhering to the humidity sensor. This physical-quantity detection device 300 is characterized by having a detection unit 422 that detects humidity, a detection unit 421 that detects pressure, a circuit board 400 that has an electronic circuit that processes detection signals, and a housing 302 that accommodates the circuit board 400. The physical-quantity detection device 300 is also characterized in that the detection units 422, 421 are laid out on the surface of the circuit board 400 in a straight line in the direction in which a gas being measured flows, with the detection unit 421 that detects pressure positioned upstream of the detection unit 422 that detects humidity.