Abstract: A physical quantity detection device (20), which can be disposed in a main flow path (22a) where a measurement target gas (2) flows in one direction, includes: a circuit chamber (135a) that accommodates a circuit board (300); an inflow hole (220) that communicates the main flow path (22a) with the circuit chamber (135a) and allows the measurement target gas (2) flowing through the main flow path (22a) to flow into the circuit chamber (135a); an outflow hole (170) that communicates the main flow path (22a) with the circuit chamber (135a) and allows the measurement target gas (2) in the circuit chamber (135a) to flow out to the main flow path (22a); and a sensor (322) disposed in the circuit chamber (135a) to be at least partially located on a path (2a) of the measurement target gas (2) flowing from the inflow hole (220) to the outflow hole (170).

Abstract: Provided is a physical quantity detection device that can improve physical quantity measurement accuracy over a conventional device. A physical quantity detection device 20 includes a detector including a flow rate detection unit 205, a circuit board 207, a housing 201, and a cover 202. The detector detects a physical quantity and is mounted on the circuit board 207. The housing 201 houses the circuit board 207. The cover 202 is fixed to the housing 201 and defines an auxiliary passage 234 in which the flow rate detection unit 205 is disposed. The housing 201 and the cover 202 include a positioning portion P that includes a pin P1 extending in a thickness direction Dt of the circuit board 207 and a fitting portion P2 into which an end portion P11 of the pin P1 is fitted for positioning between the housing 201 and the cover 202.

Abstract: A physical quantity detection device for reducing an influence of a sound wave generated in a turbocharger and suppressing a decrease in detection accuracy of a physical quantity including a flow rate of gas. The device detects a physical quantity of air from an intake passage of an engine equipped with a turbocharger. The physical device includes a sub-passage that takes in part of air flowing from an upstream to a downstream side of the intake passage along a first direction, and a flow rate detection unit that detects a flow rate of the air taken in the sub-passage. The sub-passage includes an inlet that opens toward the upstream side in the first direction, an outlet that opens toward the downstream side in the first direction, and an attenuation chamber that attenuates a sound wave propagating from the turbocharger to an inside of the outlet.

Abstract: A physical quantity detection device for reducing an influence of a sound wave generated in a turbocharger and suppressing a decrease in detection accuracy of a physical quantity including a flow rate of gas. The device detects a physical quantity of air from an intake passage of an engine equipped with a turbocharger. The physical device includes a sub-passage that takes in part of air flowing from an upstream to a downstream side of the intake passage along a first direction, and a flow rate detection unit that detects a flow rate of the air taken in the sub-passage. The sub-passage includes an inlet that opens toward the upstream side in the first direction, an outlet that opens toward the downstream side in the first direction, and an attenuation chamber that attenuates a sound wave propagating from the turbocharger to an inside of the outlet.

Abstract: An object of the present invention is to provide a physical quantity detection device configured to reduce an influence of a resonance phenomenon of sound pressure on flow rate characteristics. The physical quantity detection device according to the present invention includes: a housing arranged in the main passage; a sub-passage arranged in the housing; a flow rate detection unit arranged in the sub-passage; a circuit unit electrically connected to the flow rate detection unit; a circuit chamber arranged in the housing and accommodating the circuit unit; and a first introduction passage including one end open to the sub-passage and the other end open to the circuit chamber to communicate between the sub-passage and the circuit chamber.

Abstract: An object is to improve measurement accuracy of a flow rate measurement device. A flow rate measurement device including: a first void which is formed of one surface of the support body and one surface of the circuit board; a second void which is formed of a surface opposite to the one surface of the circuit board and the housing; and a third void which is formed of a surface opposite to the one surface of the support body and a cover.

Abstract: According to the present invention, it is possible to provide a flow rate measurement device capable of accurately measuring a flow rate of a measurement target gas by improving anti-contamination property. A flow rate measurement device (20) of the present invention includes a board (304) disposed along a flow direction of a measurement target gas (2) in a sub passage (134), a support body (401) that is disposed to face one surface (304a) of the board, and a flow rate sensor (411) that is supported by the support body, faces the one surface of the board, and measures a flow rate of the measurement target gas passing between the support body and the board.

Abstract: Provided is a physical quantity detection device that can improve physical quantity measurement accuracy over a conventional device. A physical quantity detection device 20 includes a detector including a flow rate detection unit 205, a circuit board 207, a housing 201, and a cover 202. The detector detects a physical quantity and is mounted on the circuit board 207. The housing 201 houses the circuit board 207. The cover 202 is fixed to the housing 201 and defines an auxiliary passage 234 in which the flow rate detection unit 205 is disposed. The housing 201 and the cover 202 include a positioning portion P that includes a pin P1 extending in a thickness direction Dt of the circuit board 207 and a fitting portion P2 into which an end portion P11 of the pin P1 is fitted for positioning between the housing 201 and the cover 202.

Abstract: Provided is a physical quantity detection device capable of improving noise performance of a flow rate detection unit as compared with the related art. The physical quantity detection device 20 includes a plate-like chip package 208 that is arranged to protrude from the flow path of the measurement target gas and has a width W along the flow direction of the measurement target gas. The chip package 208 includes a flow rate detection unit 205, an accelerating flow path 208c, a measurement surface 208a, a non-measurement surface 208b, and a separation flow portion 208d. The cross sectional area of the accelerating flow path 208c is reduced, and the flow rate detection unit 205 is arranged. The separation flow portion 208d partitions the second sub-passage 234b into a measurement flow path facing the measurement surface 208a and a non-measurement flow path facing the non-measurement surface 208b.

Abstract: In the physical quantity detection device, the occurrence of the measurement error is reduced by suppressing the flow bias in the sub-passage and reducing the resistance in the passage. A physical quantity detection device 30 of the present invention includes a measuring portion 310 disposed in a main passage, a sub-passage 330 that takes a gas to be measured from the main passage, a support member 603 that divides a part of the sub-passage into two flow paths of one surface side and the other surface side in a direction intersecting a passage width direction, and a flow rate detection element 602 disposed on one surface of the support member. The sub-passage includes a straight portion 321 in which the support member is disposed and a downstream curved portion 322 that is curved to one side in the passage width direction of the straight portion.

Abstract: To obtain a physical quantity detection device capable of reducing an intake amount of air accompanied by foreign matter. A physical quantity detection device (20) of the invention includes a housing arranged in a main passage through which a measurement target gas (2) flows. The housing is provided with a second sub-passage (B) that takes in a part of the measurement target gas (2) flowing in the main passage, a circuit chamber (135) that accommodates a pressure sensor (320) that detects a pressure of the measurement target gas (2), and a pressure introduction passage (170) having one end opened in the middle of the second sub-passage (B) and the other end opened in the circuit chamber (135) and capable of introducing the pressure of the measurement target gas (2) from the second sub-passage (B) into the circuit chamber (135). In the pressure introduction passage (170), an introduction port (171) is arranged at a position offset outward from a side wall surface (152b) of the second sub-passage (B).

Abstract: Provided is a physical quantity detection device capable of achieving both rigidity improvement and sealability improvement. A physical quantity detection device (20) of the invention includes a housing (100), a cover (200), a chip package (310), and a flow rate sensor (311) supported by the chip package and arranged in a sub-passage. The housing includes: a first adhesive groove 160A which is an adhesive groove to which an adhesive for bonding the cover is applied, extends along a proximal end of the housing, extends in the protruding direction of the housing from the proximal end of the housing to a position on a more distal end side of the housing than the chip package, and is applied with the first adhesive 401; and a second adhesive groove 160B which extends along the sub-passage 134 and is applied with the second adhesive 402. The first adhesive has a higher Young's modulus, and the second adhesive has a higher thixotropy.

Abstract: Provided is a physical quantity detection device capable of improving noise performance of a flow rate detection unit as compared with the related art. The physical quantity detection device 20 includes a plate-like chip package 208 that is arranged to protrude from the flow path of the measurement target gas and has a width W along the flow direction of the measurement target gas. The chip package 208 includes a flow rate detection unit 205, an accelerating flow path 208c, a measurement surface 208a, a non-measurement surface 208b, and a separation flow portion 208d. The cross sectional area of the accelerating flow path 208c is reduced, and the flow rate detection unit 205 is arranged. The separation flow portion 208d partitions the second sub-passage 234b into a measurement flow path facing the measurement surface 208a and a non-measurement flow path facing the non-measurement surface 208b.

Abstract: To obtain a physical quantity detection device capable of reducing an intake amount of air accompanied by foreign matter. A physical quantity detection device (20) of the invention includes a housing arranged in a main passage through which a measurement target gas (2) flows. The housing is provided with a second sub-passage (B) that takes in a part of the measurement target gas (2) flowing in the main passage, a circuit chamber (135) that accommodates a pressure sensor (320) that detects a pressure of the measurement target gas (2), and a pressure introduction passage (170) having one end opened in the middle of the second sub-passage (B) and the other end opened in the circuit chamber (135) and capable of introducing the pressure of the measurement target gas (2) from the second sub-passage (B) into the circuit chamber (135). In the pressure introduction passage (170), an introduction port (171) is arranged at a position offset outward from a side wall surface (152b) of the second sub-passage (B).

Abstract: Provided is a physical quantity detection device capable of achieving both rigidity improvement and sealability improvement. A physical quantity detection device (20) of the invention includes a housing (100), a cover (200), a chip package (310), and a flow rate sensor (311) supported by the chip package and arranged in a sub-passage. The housing includes: a first adhesive groove 160A which is an adhesive groove to which an adhesive for bonding the cover is applied, extends along a proximal end of the housing, extends in the protruding direction of the housing from the proximal end of the housing to a position on a more distal end side of the housing than the chip package, and is applied with the first adhesive 401; and a second adhesive groove 160B which extends along the sub-passage 134 and is applied with the second adhesive 402. The first adhesive has a higher Young's modulus, and the second adhesive has a higher thixotropy.

Abstract: A bus bar and a detection element uses resin to mold and integrate, leading to a disadvantage of complicating manufacturing. The bus bar is sandwiched and fixed between a second mold member and a first mold member. A sensor substrate on which a detection element is mounted is installed above the second mold member. The detection element is fixedly disposed at a position facing the bus bar, and detects a current flowing through the bus bar.

Abstract: A power conversion device of the present invention includes a power conversion circuit configured to convert power; a conductor configured to transmit a current to the power conversion circuit; and a coreless current sensor configured to detect the current, in which the coreless current sensor includes: a magnetic field detection portion configured to detect a magnetic field of the current; and a shield portion that faces the magnetic field detection portion, the conductor includes: a first conductor portion that passes through a space between the magnetic field detection portion and the shield portion; and a second conductor portion connected to the first conductor portion via a first bent portion, and the first bent portion is formed such that the space between the magnetic field detection portion and the shield portion is not disposed in a direction perpendicular to a face of the second conductor portion closest to the shield portion.

Abstract: A power conversion device of the present invention includes a power conversion circuit configured to convert power; a conductor configured to transmit a current to the power conversion circuit; and a coreless current sensor configured to detect the current, in which the coreless current sensor includes: a magnetic field detection portion configured to detect a magnetic field of the current; and a shield portion that faces the magnetic field detection portion, the conductor includes: a first conductor portion that passes through a space between the magnetic field detection portion and the shield portion; and a second conductor portion connected to the first conductor portion via a first bent portion, and the first bent portion is formed such that the space between the magnetic field detection portion and the shield portion is not disposed in a direction perpendicular to a face of the second conductor portion closest to the shield portion.

Abstract: A bus bar and a detection element uses resin to mold and integrate, leading to a disadvantage of complicating manufacturing. The bus bar is sandwiched and fixed between a second mold member and a first mold member. A sensor substrate on which a detection element is mounted is installed above the second mold member. The detection element is fixedly disposed at a position facing the bus bar, and detects a current flowing through the bus bar.

Abstract: The purpose of the present invention is to provide a current detection device which is less susceptible to a disturbance magnetic flux and does not easily cause the decrease of a detectable maximum current. A current detection device is provided with: a first magnetic shield member which has a side wall part that covers one side of a conductor and a protruding part that protrudes toward the other side from the side wall part; and a second magnetic shield member which has a side wall part that covers the other side of the conductor and a protruding part that protrudes toward the one side from the side wall part, and the protruding part of the first magnetic shield member and the protruding part of the second magnetic shield member form a gap therebetween while overlapping each other in the protruding direction of the protruding parts.