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DE-112020002134-B4 - Device for detecting a physical quantity

DE112020002134B4DE 112020002134 B4DE112020002134 B4DE 112020002134B4DE-112020002134-B4

Abstract

Device for detecting a physical quantity (30) that detects a physical quantity of a gas (IA) to be measured flowing in a main passage (124), the device for detecting a physical quantity (30) comprising: a measuring section (310) arranged in the main passage (124); a secondary passage (330) provided in the measuring section (310) and configured to extract the gas (IA) to be measured from the main passage (124); a supporting element (603) extending in a center of the passage of the secondary passage (330) across a passage width direction of the secondary passage (330) and dividing a portion of the secondary passage (330) in a direction intersecting the passage width direction into two flow paths on the side of one surface (603a) and on the side of the other surface (603b); and a flow rate detection element (602) arranged on a surface (603a) of the supporting component (603) and detecting a flow rate of the gas to be measured (IA) in the secondary passage (330), wherein the secondary passage (330) comprises a straight section (321) which is linear and on which the supporting component (603) is arranged, and an outlet-side curved section (322) which is continuous with an outlet side of the straight section (321) and is curved in one direction in the passage width direction of the straight section (321), wherein the straight section (321) is provided with a partition (500, 501, 502) which divides the flow path (332) on the side of the other surface (603b) of the supporting component (603) in the passage width direction into two flow paths on one side and on the other The side divides, and between the two flow paths on one side and on the other side in the direction of the passage width, which is divided by the partition (500, 501, 502) are divided, a cross-sectional area of the flow path (332a) on one side in the passage width direction is smaller than a cross-sectional area of the flow path (332b) on the other side in the passage width direction, characterized in that the partition (502) contains several rod-shaped components which are arranged next to each other at predetermined intervals in a direction of travel of the straight section (321).

Inventors

  • Masamichi Nakamura
  • Akira Uenodan
  • Takahiro Miki
  • Nobuaki GORAI
  • Naoki Saito
  • Takayuki Ishikawa

Assignees

  • HITACHI ASTEMO, LTD.

Dates

Publication Date
20260513
Application Date
20200612
Priority Date
20190625

Claims (7)

  1. Device for detecting a physical quantity (30) that detects a physical quantity of a gas (IA) to be measured flowing in a main passage (124), the device for detecting a physical quantity (30) comprising: a measuring section (310) arranged in the main passage (124); a secondary passage (330) provided in the measuring section (310) and configured to extract the gas (IA) to be measured from the main passage (124); a supporting element (603) extending in a center of the passage of the secondary passage (330) across a passage width direction of the secondary passage (330) and dividing a portion of the secondary passage (330) in a direction intersecting the passage width direction into two flow paths on the side of one surface (603a) and on the side of the other surface (603b); and a flow rate detection element (602) arranged on a surface (603a) of the supporting component (603) and detecting a flow rate of the gas to be measured (IA) in the secondary passage (330), wherein the secondary passage (330) comprises a straight section (321) which is linear and on which the supporting component (603) is arranged, and an outlet-side curved section (322) which is continuous with an outlet side of the straight section (321) and is curved in one direction in the passage width direction of the straight section (321), wherein the straight section (321) is provided with a partition (500, 501, 502) which divides the flow path (332) on the side of the other surface (603b) of the supporting component (603) in the passage width direction into two flow paths on one side and on the other The side divides, and among the two flow paths on one side and on the other side in the passage width direction, which are divided by the partition (500, 501, 502), a cross-sectional area of the flow path (332a) on one side in the passage width direction is smaller than a cross-sectional area of the flow path (332b) on the other side in the passage width direction, characterized in that the partition (502) contains several rod-shaped components which are arranged next to each other at predetermined intervals in a direction of travel of the straight section (321).
  2. Device for detecting a physical quantity (30) according to Claim 1 , wherein the partition (500) has a sufficient height to be separated from a lower surface (321c) of the adjacent the passage (330), which faces the other surface (603b) of the supporting component (603), protrudes in the direction of the supporting component (603) and rests against the other surface (603b) of the supporting component (603).
  3. Device for detecting a physical quantity (30) according to Claim 2 , wherein the partition (500) extends along the straight section (321), an inlet-side end section of the partition (500), which is arranged on an inlet side of the straight section (321), is arranged in relation to the inlet-side end section of the supporting component (603) at the same position as an inlet-side end section of the supporting component (603) or at a position on an outlet side of the straight section (321), and the outlet-side end section of the partition (500), which is arranged on an outlet side of the straight section (321), is arranged in relation to the outlet-side end section of the supporting component (603) at the same position as an outlet-side end section of the supporting component (603) or at a position on an inlet side of the straight section (321).
  4. Device for detecting a physical quantity (30) according to Claim 2 , wherein the partition (500) has an inlet-side extension wall (500a) which is extended from the supporting element (603) along the straight section (321) in the direction of the inlet of the straight section (321), and an outlet-side extension wall (500b) which is extended from the supporting element (603) along the straight section (321) in the direction of the outlet side of the straight section (321).
  5. Device for detecting a physical quantity (30) according to Claim 1 , wherein the partition (500, 501) is arranged at a position which is displaced in the direction of one side in the passage width direction from a central position in the passage width direction of the secondary passage (330).
  6. Device for detecting a physical quantity (30) according to Claim 1 , wherein in the partition (501) a minimum section of a cross-sectional area of a flow path (332a) on one side in the passage width direction is smaller than a minimum section of a cross-sectional area of a flow path (332b) on the other side in the passage width direction.
  7. Device for detecting a physical quantity (30) according to Claim 1 , wherein the secondary passage (330) contains an inlet-side curved section (324) which is continuous with one inlet side of the straight section (321) and is curved to the other side in a passage width direction of the straight section (321).

Description

Technical field The present disclosure relates to a device for detecting a physical quantity, for example, a physical quantity of intake air in an internal combustion engine. State of the art JP 2003-315116 A Disclosure reveals, for example, a configuration of a device for detecting a physical quantity, in which a measuring section projects from the inner wall of an inlet passage towards the center of the passage, a secondary passage for drawing in a flow is arranged in the measuring section, and a flow rate detection element is arranged spanning the curved secondary passage. In the device for detecting a physical quantity described above, a plate-like component is installed on the inlet side of the detection element to protect it and to protect the detection element from contaminants flowing into the secondary passage. Since the velocity of the flow passing through the detection element decreases during this time, a device for detecting a physical quantity has been proposed that increases the flow velocity by installing a resistance component in a passage divided by a support section of the detection element. Furthermore, a device according to the preamble of claim 1 is derived from the WO 2020/003809 A1 known. Further devices for the detection of a physical quantity are from the JP 2018-205071 A , DE 102 53 691 A1 and DE 11 2012 005 695 T5 known. Summary of the invention Technical problem Although in the configuration of JP 2003-315116 A In the secondary passage, resistance components are installed to increase the flow velocity near the detection element. However, these components are installed symmetrically, resulting in only a simple acceleration effect near the detection element. The flow velocity distribution throughout the entire passage is not taken into account. Therefore, in some cases, the pressure drop in the passage may increase, the flow velocity may decrease, and the flow rate of the gas being measured may decrease. Furthermore, there are concerns that errors may change due to pulsation conditions and that the detection accuracy may decrease. The present invention was made in light of the above points and one object of the present invention is to create a device for the detection of a physical quantity which is capable of optimizing a flow velocity distribution in a bypass and preventing changes of errors under multiple pulsation conditions. Solution to the problem The aforementioned problem is solved by a device according to claim 1. A device for detecting a physical quantity is provided, which detects a physical quantity of a gas to be measured flowing in a main passage, wherein the device for detecting a physical quantity comprises: a measuring section arranged in the main passage; a secondary passage provided in the measuring section and configured to extract the gas to be measured from the main passage; a supporting element extending across a passage width direction of the secondary passage at a center of the passage of the secondary passage and dividing a portion of the secondary passage into two flow paths on one side of a surface and on the other side of a surface in a direction that intersects the passage width direction; and a flow rate detection element arranged on a surface of the supporting component and detecting a flow rate of the gas to be measured in the secondary passage, wherein the secondary passage comprises a straight section which is linear and on which the supporting component is arranged, and an outlet-side curved section which is continuous with an outlet side of the straight section and is curved in the direction of one side in the passage width direction of the straight section, wherein the straight section is provided with a partition which divides the flow path on the side of the other surface of the supporting component in the passage width direction into two flow paths on one side and on the other side, and among the two flow paths on one side and on the other side in the passage width direction which are divided by the partition, a cross-sectional area of the flow path on one side in the passage width direction is smaller than a cross-sectional area of the flow path on the other side in the passage width direction. The device according to the invention is characterized in that the partition wall contains several rod-shaped components which run in one direction. of the straight section are arranged next to each other at predetermined intervals. Advantageous effects of the invention According to the present invention, it is possible to optimize the flow velocity distribution in the bypass and to prevent changes in errors under multiple pulsation conditions. Further features relating to the present invention will become apparent from the description of this patent specification and from the accompanying drawings. Other problems, configurations, and effects than those described above are explained by the following description of embodiments. Brief description of t