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.

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: 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: 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.

Abstract: In order to provide a humidity measuring device capable of determining whether or not a detection value by a humidity sensor is valid, a humidity measuring device of the present invention is a humidity measuring device for measuring humidity of the intake air in an internal-combustion engine, and includes a water droplet adhesion determination means for determining whether or not a water droplet adheres to a surface of a sensor element of a humidity sensor, based on changes in the humidity and the temperature of the intake air. Thus, it is possible to determine whether or not a detection value by the humidity sensor is valid.

Abstract: In order to provide a temperature and humidity sensor with improved reliability, the temperature and humidity sensor in which all or part of a case of the temperature and humidity sensor is inserted into a main duct for causing gas to pass through and which detects humidity of the gas, includes: a first sub-passage configured as a part of the case, a part of the gas passing through the main duct flowing in substantially the same direction as a flow in the main duct; a throttle section provided between an inlet and an outlet of the first sub-passage and on an inner surface of the first sub-passage, the throttle section having a throttle whose cross-sectional area is smaller than an average cross-sectional area of the entire first sub-passage; and a second sub-passage which connects an upstream side and a downstream side of the throttle section and is different from the first sub-passage.

Abstract: In order provide a mass air flow measurement device capable of enhancing contamination resistance of a humidity sensing element and achieving highly accurate air flow sensing, the mass air flow measurement device includes an air flow sensing element that senses air flow, a physical quantity sensing element that senses at least one of humidity and pressure, and a circuit package incorporating a circuit that processes an output signal of the air flow sensing element and an output signal of the physical quantity sensing element. The air flow sensing element and the physical quantity sensing element are arranged within the same circuit package.

Abstract: A highly sensitive humidity measurement device is provided. The humidity measurement device has: a housing component integrally including a connector for performing input/output to/from the outside and a connector terminal component; an electronic circuit board mounted on the housing component and electrically connected to the connector terminal; and a humidity sensing element provided on the electronic circuit board. When the humidity measurement device is installed in an installation hole that is provided in a part of a main air flow passage through which suction air flows, apart of the housing component is exposed to the suction air flowing through the main air flow passage. The housing component is provided with a bypass passage to suction a part of the suction air. The bypass passage includes a bypass inlet opening that serves as a suction port of the suction air and a bypass outlet opening that discharges the suction air. The bypass outlet opening is exposed to the suction air.

Abstract: Provided is a physical quantity measuring device for reducing the influence of heat, other than the heat of a gas to be measured, on a measuring unit for measuring a physical quantity of the gas to be measured. The physical quantity measuring device according to the present invention includes a chip package 40 and a casing 11. The chip package 40 is molded from a polymeric resin, including first and second measuring units measuring first and second physical quantities of the gas to be measured, and a signal processing unit being connected to the first and second measuring units, and processing signals transmitted from the first and second measuring units, The casing 11 fixedly stores the chip package 40, and includes first and second bypass passages 12 and 14 allowing the gas to be measured taken from a main passage 70, to flow in the first measuring unit. In the chip package 40, the signal processing unit 44 is disposed between the first and second measuring units.

Abstract: A highly sensitive humidity measurement device is provided. The humidity measurement device has: a housing component integrally including a connector for performing input/output to/from the outside and a connector terminal component; an electronic circuit board mounted on the housing component and electrically connected to the connector terminal; and a humidity sensing element provided on the electronic circuit board. When the humidity measurement device is installed in an installation hole that is provided in a part of a main air flow passage through which suction air flows, apart of the housing component is exposed to the suction air flowing through the main air flow passage. The housing component is provided with a bypass passage to suction a part of the suction air. The bypass passage includes a bypass inlet opening that serves as a suction port of the suction air and a bypass outlet opening that discharges the suction air. The bypass outlet opening is exposed to the suction air.

Abstract: To prevent dew condensation on a sensor element, an air physical quantity sensing device which has a housing structural component integrally provided with a connector and a connector terminal member that perform input and output with the outside, an electronic circuit board mounted on the housing structural component, and an air physical quantity sensing element provided on the electronic circuit board and capable of detecting physical quantity of air. The housing structural component formed with a communication hole which allows the inside and outside of the main air flow passage to communicate with each other. The electronic circuit board has the communication hole separated into two and the surface on the side where the air physical quantity sensing element is provided faces the main air flow passage side.