A temperature sensor includes a pair of thermocouple wires, a temperature measuring junction formed by joining tip ends of the pair of thermocouple wires together, an outer tube having a tip end provided with a tip end cover in which the temperature measuring junction is held, an insulator insulating the pair of thermocouple wires from the outer tube, and a glass seal filled in a base end of the outer tube to seal the outer tube from inside thereof. The glass seal contains bubbles which are independent of each other.

A method and system for monitoring a temperature of a gas turbine engine are described. The method comprises obtaining individual sensor readings from functioning temperature sensors of a sensor array, where a number of the functioning temperature sensors is less than a total number of temperature sensors in the sensor array; applying correction factors to the individual sensor readings of the functioning temperature sensors based on deviations of the individual sensor readings from a total average temperature of all the temperature sensors in the array, to obtain corrected individual sensor readings; and determining a corrected total average temperature as a sum of the corrected individual sensor readings divided by the number of functioning temperature sensors.

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.

A system for diagnosing a misfire of an engine includes a sensing unit including at least one sensor for detecting at least one detection value associated with an operation of the engine, and an electronic control unit configured to determine whether a misfire of the engine due to exhaust valve leakage has occurred based on the detection values from the sensing unit, and perform an operation corresponding to the misfire due to exhaust valve leakage when the misfire due to exhaust valve leakage has occurred, wherein the electronic control unit a misfire code for exhaust valve leakage in a memory when the misfire due to exhaust valve leakage has occurred.

A physical quantity measuring device detects a physical quantity of gas flowing in a flow passage. The physical quantity measuring device includes a sensor element that outputs a detection signal according to the physical quantity, a case that is provided to the flow passage and houses the sensor element, and a protrusion that protrudes from a passage wall surface facing the flow passage. The case includes a measurement chamber that houses the sensor element and an inflow port that is configured to cause a part of gas flowing in the flow passage to flow into the measurement chamber therethrough. The protrusion is configured to guide gas flowing along the passage wall surface toward the inflow port.

A physical quantity measurement device measures a physical quantity of a fluid. A detection unit has a physical quantity detector that detects a physical quantity of the fluid in a measurement flow channel. A housing accommodates at least a part of the detection unit and forms the measurement flow channel. The housing includes a housing attachment that is attached to a predetermined attaching target, and a position holder holding a position of the detection unit by contacting the detection unit. The housing includes an inward part positioned inward of the attaching target and an outward part positioned outward of the attaching target. The position holder is provided inward of the housing attachment in an alignment direction along which the inward part and the outward part are aligned.

To obtain a temperature sensor device having high reliability and high sensitivity without cost increase. This temperature sensor device includes: a housing provided with a temperature sensor module having a temperature detection element and an external connection terminal connected to the temperature detection element via a lead wire, which are integrated using a first formation member made from a thermoplastic resin, the temperature sensor module being covered with a second formation member made from a thermoplastic resin, so as to form a connector for connecting the external connection terminal to an external signal processing circuit; and a case into which the temperature sensor module is press-fitted and which is opposed to the housing, wherein the first formation member and the second formation member are welded to each other.

A flow rate detector includes: a housing; and a substrate assembly disposed in the housing. The substrate assembly has a flow rate detection element, a temperature detection element, and a circuit board on which the flow rate detection element and the temperature detection element are mounted. The circuit board includes a body portion fixed to the housing, and a protrusion extended to protrude from the body portion. The protrusion has an element fix portion to which the temperature detection element is fixed. The protrusion has a supported portion within a supported range including a position of the element fix portion. The supported range is defined from the element fix portion to a tip end of the protrusion along an extension direction of the protrusion. The supported portion is supported by the housing to suppress a displacement of the element fix portion in a thickness direction of the circuit board.

An air temperature sensor for use on an aircraft can include a housing defining an interior and having a trailing edge, a temperature sensor having a distal end and located within the interior, a support tube surrounding at least a portion the temperature sensor, an element shroud surrounding at least a portion of support tube, and a bushing isolating the trailing edge of the housing from the distal end of temperature sensor.

A thermal flowmeter includes a plurality of measuring units for stabilizing air flowing in a sub-passage, and improves noise performance or a pulsation characteristic of a flow rate sensor. The thermal flowmeter includes a flange fixed to an attachment part of a main passage, a sub-passage takes in a part of measured gas flowing in the main passage, a flow rate measuring unit measures a flow rate of the measured gas in the sub-passage, a circuit component controls the flow rate measuring unit, and the flow rate measuring unit and an electronic component are mounted on a circuit substrate. The sub-passage is formed in a substrate of the circuit substrate, the sub-passage on a surface side of the circuit substrate and a second space on a rear surface side are separated by the circuit substrate, and a pressure measuring unit and the circuit component are arranged in the second space.