Humidity measurement device
According to the conventional knowledge, a thermal humidity measurement device has problems in which the direction of air flow is limited to one direction is too hard to handle in securing the humidity responsiveness because there are limitations on the mounting direction of the thermal humidity measurement device and the state of air flow. An introduction guide protrudes from an air introduction surface to the outside of a measurement chamber, is parallel to a humidity introduction port surface, and has a portion not in contact with an inlet surface of a humidity introduction tube as seen from any direction to guide the flow of air to the humidity introduction tube from any direction of 360°.
1. A humidity measurement device comprising:
a measurement chamber in which a humidity detection element is mounted;
an introduction pipe arranged to introduce a measurement medium into the measurement chamber; and
an air introduction guide protruding from an inlet opening of the introduction pipe, wherein
the air introduction guide has a portion not in contact with the inlet opening of the introduction pipe in all directions of 360° as viewed from a direction perpendicular to an air introduction direction,
wherein a temperature sensor is disposed on a tip side of the air introduction guide.
2. The humidity measurement device according to claim 1 , wherein the portion of the air introduction guide protruding from the introduction pipe has a rectangular cross-section shape on a surface perpendicular to the introduction direction.
3. The humidity measurement device according to claim 1 , wherein
the temperature sensor has a wiring lead coated with a corrosion resistant material, and
an interface between the wiring lead and the corrosion resistant material is covered by the air introduction guide.
4. The thermal humidity measurement device according to claim 1 , wherein the humidity detection element is a thermal type.
5. The thermal humidity measurement device according to claim 4 , wherein the humidity detection element is disposed at a position hidden from the opening of the introduction pipe.
6. The thermal humidity measurement device according to claim 5 , further comprising a pressure detection element.
7. The thermal humidity measurement device according to claim 6 , comprising:
a ceramic substrate on which the pressure detection element and the humidity detection element are mounted; and
a printed board that is provided on an upper side of the ceramic substrate and has a resin package component mounted thereon.
8. The thermal humidity measurement device according to claim 7 , wherein the printed board is in a partially cutaway shape, and the ceramic substrate and the printed board are electrically conducted via wire bonding passing through the opening.
9. A vehicle system in which the thermal humidity measurement device according to claim 4 is mounted on an intake manifold and a fuel injection amount is controlled using a signal from the thermal humidity measurement device.
10. A humidity measurement device comprising:
a measurement chamber in which a humidity detection element is mounted;
an introduction pipe arranged to introduce a measurement medium into the measurement chamber; and
an air introduction guide protruding from an inlet opening of the introduction pipe, wherein
the air introduction guide has a portion not in contact with the inlet opening of the introduction pipe in all directions of 360° as viewed from a direction perpendicular to an air introduction direction,
wherein the portion of the air introduction guide protruding from the introduction pipe has a point-symmetrical cross-section shape on a surface perpendicular to the introduction direction.
11. The humidity measurement device according to claim 10 , wherein the portion of the air introduction guide protruding from the introduction pipe has a cruciform cross-section shape on the surface perpendicular to the introduction direction.
12. A humidity measurement device comprising:
a measurement chamber in which a humidity detection element is mounted;
an introduction pipe arranged to introduce a measurement medium into the measurement chamber; and
an air introduction guide protruding from an inlet opening of the introduction pipe, wherein
the air introduction guide has a portion not in contact with the inlet opening of the introduction pipe in all directions of 360° as viewed from a direction perpendicular to an air introduction direction,
wherein an auxiliary air introduction guide is provided on an introduction port surface of the introduction pipe.