A device which measures a physical quantity of a gas flowing through a main passage is described. The device includes a flange for fixing to the main passage; a housing that protrudes toward an inside of the main passage from the flange; and a printed circuit board fixed to the housing on which a measuring element that measures the physical quantity is mounted. Wiring of the printed circuit board has a plurality of irregularities formed along one direction of a surface, and the wiring is arranged such that a formation direction of the irregularities is oriented along a protruding direction of the housing toward an inside of the main passage. The irregularities may be polishing marks formed using a cylindrical polishing wheel or rolling marks of the wiring of the printed circuit board.

A cooling device includes a case delimiting an air circulation enclosure. The case comprises an air intake opening intended to be connected to an air inlet, and an air outlet opening intended to be connected to a heat engine. The cooling device includes an exhaust gas driving device housed at least partially in the air circulation enclosure. The exhaust gas driving device includes at least one exhaust gas flow sensor, each flow sensor being housed entirely in the air circulation enclosure of the case.

A power electronics assembly that controls an electrically-actuated turbocharger includes a printed circuit board (PCB) having a non-conductive substrate supporting one or more electrical components that attach to the non-conductive substrate on one or more sides of the PCB; one or more conductive layers that couple with the non-conductive substrate and conduct electrical current within the PCB; a fluid barrier layer applied to an outer surface of the non-conductive substrate or conductor layer; and a PCB housing, configured to couple with the electrically-actuated turbocharger, having a fluid cavity that communicates liquid from an internal combustion engine (ICE) to the fluid barrier layer separating the liquid and the PCB.

The present disclosure provides an intake air flow rate measuring device. The intake air flow rate measuring device includes a flange, a casing, a flow rate sensor, a humidity sensing element, an element terminal, and a humidity terminal. The humidity terminal is spaced away from the element terminal. A portion of the casing between the element terminal and the humidity terminal is defined as a suppressing portion, and a cross-section of the suppressing portion is defined as a suppressing portion cross-section. An end portion of the casing close to the flange is defined as a base portion, and a cross-section of the base portion is defined as a base portion cross-section. The suppressing portion cross-section is set to be smaller than the base portion cross-section.

A piezoelectric pressure sensor is characterized by a piezoelectric transducer having substantially parallel piezoelectric plate faces oriented in planes that extend substantially parallel a principal longitudinal axis of the sensor, a pair of clamping members engaging the piezoelectric plate faces, a membrane cap covering the clamping members and mounted on a stem to define an enclosed protective chamber that isolates the piezoelectric transducer and the clamping members from an environment outside the membrane cap. The membrane cap has a membrane wall engaging outside faces of the clamping members. The membrane wall undergoes inward deflections in response to pressure increases in the environment outside the membrane cap. The clamping members undergo corresponding inward deflections in response to the inward deflections of the membrane wall. The inward deflections of the clamping members act on the piezoelectric plate faces, resulting in deformations of the piezoelectric transducer that produce corresponding electrical signals.

A piezoelectric pressure sensor is characterized by a piezoelectric transducer having substantially parallel piezoelectric plate faces oriented in planes that extend substantially parallel a principal longitudinal axis of the sensor, a pair of clamping members engaging the piezoelectric plate faces, a membrane cap covering the clamping members and mounted on a stem to define an enclosed protective chamber that isolates the piezoelectric transducer and the clamping members from an environment outside the membrane cap. The membrane cap has a membrane wall engaging outside faces of the clamping members. The membrane wall undergoes inward deflections in response to pressure increases in the environment outside the membrane cap. The clamping members undergo corresponding inward deflections in response to the inward deflections of the membrane wall. The inward deflections of the clamping members act on the piezoelectric plate faces, resulting in deformations of the piezoelectric transducer that produce corresponding electrical signals.

A flap device for an internal combustion engine which includes a flow housing with a housing wall which delimits a flow-through duct. The flap device includes a shaft mounted in the flow housing, a flap body rotatably mounted on the shaft, an actuator for the shaft, and a pressure measurement point. The pressure measurement point is arranged in a duct section of the flow housing so that the flap body traverses the pressure measurement point when rotating, and in a region of the flow housing remote from the shaft when viewed in a circumferential direction of the housing wall. A flap surface of the flap body is directed towards the pressure measurement point and is curved so that, in each rotary position, a tangent arranged at the position of the curved flap surface having a shortest distance to an opposite wall surface of the flow housing is parallel thereto.

A power electronics assembly that controls an electrically-actuated turbocharger includes a printed circuit board (PCB) having a non-conductive substrate supporting one or more electrical components that attach to the non-conductive substrate on one or more sides of the PCB; one or more conductive layers that couple with the non-conductive substrate and conduct electrical current within the PCB; a fluid barrier layer applied to an outer surface of the non-conductive substrate or conductor layer; and a PCB housing, configured to couple with the electrically-actuated turbocharger, having a fluid cavity that communicates liquid from an internal combustion engine (ICE) to the fluid barrier layer separating the liquid and the PCB.

In a physical quantity measurement device using a printed circuit board, breakage of a wiring on the printed circuit board is suppressed. Provided are a flange 110 for fixing to a main passage, a housing 101 provided so as to protrude toward an inside of the main passage from the flange 110, and a printed circuit board 140 which is fixed to the housing 101 and on which a measuring element that measures a physical quantity is mounted. A wiring of the printed circuit board 140 has a plurality of irregularities formed along one direction of a surface, and is arranged such that a formation direction of the irregularities is oriented along a protruding direction of the housing 101 toward an inside of the main passage.

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. The first sub-passage and an inlet and an outlet of the second sub-passage are connected via respective connection ports, and the connection port between the inlet of the second sub-passage and the first sub-passage or the connection port between the outlet of the second sub-passage and the first sub-passage is provided on a side where a throttle is not provided when viewed from an axis in an upstream and downstream direction of the flow in the first sub-passage.