Measurement device

Patent metadata

Field	Value
Publication number	US-2016290893-A1
Application number	US-201615086902-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Apr 3, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A measurement device includes a bypass housing placed at a position in the intake duct that introduces an intake air to an internal combustion engine and defining a passage through which a part of the intake air flowing through an interior of the intake duct passes, a flowing amount sensor measuring a flowing amount of the intake air passing through the interior of the bypass housing, a humidity detection element measuring a humidity of the intake air passing through a position in the vicinity of the bypass housing, and a heat discharge portion being directly in contact with the intake air and being thermally bonded to the humidity detection element.

First claim

What is claimed is:

1 . A measurement device comprising:
a bypass housing placed at a position in the intake duct that introduces an intake air to an internal combustion engine, the bypass housing defining a passage through which a part of the intake air flowing through an interior of the intake duct passes; a flowing amount sensor measuring a flowing amount of the intake air passing through the interior of the bypass housing; a humidity detection element measuring a humidity of the intake air passing through a position in the vicinity of the bypass housing; and a heat discharge portion being directly in contact with the intake air, the heat discharge portion being thermally bonded to the humidity detection element.

2 . The measurement device according to claim 1 , wherein
the humidity detection element is placed at a position in the vicinity of the bypass housing, the heat discharge portion is a heat discharge plate that is also a support plate supporting a circuit substrate to which the humidity detection element is mounted, and the heat discharge plate has a heat discharge capability higher than that of a resin.

3 . The measurement device according to claim 2 , further comprising:
a mold resin molding at least a part of the humidity detection element and the heat discharge plate.

4 . The measurement device according to claim 3 , wherein
the heat discharge plate includes a protrusion portion that protrudes to an exterior of the mold resin and enlarges a surface where the heat discharge plate is in contact with the intake air.

5 . The measurement device according to claim 2 , wherein
the heat discharge plate includes a hollow portion that is placed between a position in the vicinity of a wall surface of the intake duct and a position that the heat discharge plate is thermally bonded to the humidity detection element, and the hollow portion that is a notch portion or an opening portion blocks a heat transmission.

6 . The measurement device according to claim 3 , wherein
the mold resin includes a contraction portion that is placed at a position of the mold resin closer to a wall surface of the intake duct than the humidity detection element is, and the contraction portion has a dimension of at least one of a thickness or a width which is smaller than that of other parts of the mold resin.

7 . The measurement device according to claim 2 , wherein
the circuit substrate and an electrical connection portion that is made of a metal and is placed at a position in the vicinity of a wall surface of the intake duct, are electrically connected with each other through a signal wire of a heat resistor that blocks a heat transmission.

8 . The measurement device according to claim 3 , wherein
the mold resin includes a window portion that directly introduces the intake air to a part of the humidity detection element, the measurement device further comprising: a metal plate arranged to cover at least a part of a periphery of the window portion in the mold resin.

9 . The measurement device according to claim 2 , wherein
the heat discharge plate includes a width extension portion that is placed at a position where the heat discharge plate is thermally bonded to the humidity detection element, and the width extension portion has a width larger than that of other parts of the heat discharge plate.

10 . The measurement device according to claim 2 , wherein
the heat discharge plate includes a heat discharge fin that is placed at a position to be directly in contact with the intake air so as to enlarge a surface where the heat discharge plate is in contact with the intake air.

11 . The measurement device according to claim 2 , further comprising:
a plurality of via holes is placed at a position of circuit substrate where the humidity detection element is mounted to, the via holes penetrating the circuit substrate, the via holes being filled with a metal.

12 . The measurement device according to claim 2 , wherein
the heat discharge plate is tilted relative to a flowing direction of the intake air passing through the interior of the intake duct.

13 . A measurement device comprising:
a flowing amount sensor measuring a flowing amount of an intake air flowing through an intake duct; a humidity sensor measuring a humidity of the intake air; a first protrusion portion supporting the flowing amount sensor and protruding toward an inner periphery of the intake duct; and a second protrusion portion supporting the humidity sensor, the second protrusion portion being a rod shape and protruding toward the inner periphery of the intake duct to be separated from the first protrusion portion, wherein the humidity sensor is laid in a surface of the second protrusion and is supported by the second protrusion, so as to be exposed to the intake duct, the second protrusion protrudes toward the inner periphery of the intake duct such that a longitudinal direction of the second protrusion is perpendicular to a flowing direction of the intake air, and when a cross section of the second protrusion that is perpendicular to the longitudinal direction is expressed as a vertical cross section, a periphery of the vertical cross section is a streamline shape relative to a flow of the intake air.

14 . The measurement device according to claim 13 , wherein
the humidity sensor is placed at a position in the vertical cross section where a width of the vertical cross section in a direction perpendicular to the flowing direction of the intake air is maximum.

15 . The measurement device according to claim 13 , wherein
the second protrusion includes a distal portion expressed as a protrusion end, and when a cross section of the second protrusion that is parallel to the longitudinal direction and the flowing direction of the intake air is expressed as a parallel cross section, the parallel cross section of the protrusion end is a streamline shape relative to the flow of the intake air.

16 . A measurement device comprising:
a flowing amount sensor measuring a flowing amount of an intake air flowing through an intake duct; a humidity sensor measuring a humidity of the intake air; a first protrusion portion supporting the flowing amount sensor and protruding toward an inner periphery of the intake duct; and a second protrusion portion supporting the humidity sensor, the second protrusion portion being a rod shape and protruding toward the inner periphery of the intake duct to be separated from the first protrusion portion, wherein the humidity sensor is laid in a surface of the second protrusion and is supported by the second protrusion, so as to be exposed to the intake duct, the second protrusion protrudes toward the inner periphery of the intake duct such that a longitudinal direction of the second protrusion is perpendicular to a flowing direction of the intake air, the second protrusion includes a distal portion expressed as a protrusion end, and when a cross section of the second protrusion that is parallel to the longitudinal direction and the flowing direction of the intake air is expressed as a parallel cross section, the parallel cross section of the protrusion end is a streamline shape relative to the flow of the intake air.

Assignees

• Denso Corp

Inventors

• Itakura Keisuke
• Kaifu Teruaki

Classifications

• G01F5/00 Primary

  Measuring a proportion of the volume flow · CPC title

• G01F1/00

  Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow (measuring a proportion of the volume flow G01F5/00) · CPC title

• G01F1/6845

  Micromachined devices · CPC title

• G01N27/121 Primary

  for determining moisture content, e.g. humidity, of the fluid (moisture content of the tested material G01N27/048) · CPC title

• G01M15/042 Primary

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title