Humidity measuring apparatus

A technology of humidity measurement and humidity detection, applied in the direction of material moisture content, material resistance, etc., can solve problems such as adverse effects of gas measurement, and achieve the effect of suppressing flow velocity

Inactive Publication Date: 2018-12-21
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case where the humidity detection element is exposed to the intake passage, the measurement of gas (intake air) may be adversely affected by the influence of turbulence caused by the intake pulsation generated by the high-speed operation of the internal combustion engine. question

Method used

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Experimental program
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Effect test

no. 1 approach

[0028] use Figure 1 to Figure 3 A first embodiment of the humidity measuring device of the present invention will be described.

[0029] figure 1 It is a sectional structural view showing the first embodiment of the humidity measuring device of the present invention.

[0030] The humidity measuring device 1 of the illustrated embodiment is, for example, installed in an intake passage of an internal combustion engine, and measures the humidity of air (intake air) passing through the intake passage, and mainly includes a resin case 11, a circuit board 16 and cover plate 13.

[0031] The casing 11 has a hollow cylindrical fitting portion 11A fitted to a device to be measured (for example, an air intake passage), and a main body portion 11B equipped with a circuit board 16 and the like. In the embedded part 11A, in order to allow the gas flowing in the main passage of the device to be measured to enter, a pressure introduction passage 10 composed of a linear hole having one en...

no. 2 approach

[0049] Next, use Figure 4 A second embodiment of the humidity measuring device of the present invention will be described.

[0050] Figure 4 (A) to (C) are respectively cross-sectional structural diagrams showing the vicinity of the humidity detecting element of the second embodiment of the humidity measuring device of the present invention. In addition, the same code|symbol is attached|subjected to the structure which has the same function as the said 1st Embodiment, and the detailed description is abbreviate|omitted.

[0051] exist Figure 4 In the humidity measuring device 2A of the second embodiment shown in (A), on the axis L of the pressure introduction passage 10 provided in the storage chamber 20 of the casing 11 (in such a manner as to be substantially perpendicular to the axis L of the pressure introduction passage 10 ), ) A partition member 30A composed of a flat member wider than the pressure introduction passage 10 and smaller than the storage chamber 20 is e...

no. 3 approach

[0059] Next, use Figure 5 A third embodiment of the humidity measuring device of the present invention will be described.

[0060] Figure 5 (A) and (B) are cross-sectional structural diagrams showing the vicinity of the humidity detecting element of the third embodiment of the humidity measuring device according to the present invention, respectively. In addition, the same code|symbol is attached|subjected to the structure which has the same function as the said 1st Embodiment, and the detailed description is abbreviate|omitted.

[0061] exist Figure 5The humidity measuring device 3A of the third embodiment shown in (A) is vertically installed separately in the direction of the axis L of the pressure introduction passage 10 on the axis L of the pressure introduction passage 10 provided in the storage chamber 20 of the housing 11. There are a plurality of partition members 31A, 32A (two in the illustrated example) similar to the above-mentioned second embodiment, and the ...

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Abstract

Provided is a humidity measuring apparatus that is capable of, when the humidity of gas is to be measured by the humidity measuring apparatus that uses a thermal humidity detection element, highly accurately measuring the humidity of the gas even in an environment where the gas to be measured vibrates. The humidity detection element is arranged in a space offset from the extension line of a pressure introduction passage in a storage chamber or a space formed on the inner side of a member that is provided to the extension line of the pressure introduction passage in the storage chamber, so thatthe gas introduced into the pressure introduction passage through a pressure inlet makes a turn at least once before the gas reaches the humidity detection element.

Description

technical field [0001] The present invention relates to a humidity measuring device, for example, relates to a humidity measuring device installed in various devices as measurement objects to measure the humidity of gas flowing in the devices. Background technique [0002] The humidity measuring device is, for example, installed in the air intake passage of the internal combustion engine to measure the humidity of the intake air passing through the air intake passage, and the measurement results of the humidity measuring device are used to control the fuel injection amount and optimize the operating conditions of the internal combustion engine. . [0003] The above-mentioned humidity measuring device for measuring the environment in the intake passage of the internal combustion engine needs to measure the amount of gas (intake air) in real time. Therefore, a high-speed response is desired in the humidity measurement device, and in order to realize the high-speed response, i...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N27/18
CPCG01N27/18G01N25/56
Inventor日尾真之安藤亮细川丈夫小松成亘小贯洋
OwnerHITACHI ASTEMO LTD