Physical quantity detection device

Patent metadata

Field	Value
Publication number	US-11353350-B2
Application number	US-201816633636-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Sep 29, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

To obtain a low-pressure-loss physical quantity detection device that can detect a plurality of physical quantities of intake air. A physical quantity detection device of the present invention that detects a plurality of physical quantities of a measured gas flowing in a main passage, the physical quantity detection device includes: a circuit board on which a sensor that detects the plurality of physical quantities and an electronic component that controls the physical quantities are mountable; a circuit board accommodating unit that accommodates the circuit board; and a sub-passage in which a flow sensor is disposed. The circuit board is accommodated in the circuit board accommodating unit on an upstream side of the sub-passage, and disposed in parallel with the measured gas flowing through the main passage.

First claim

The invention claimed is:

1. A physical quantity detection device for measuring physical quantities of a gas comprising intake air in a vehicle, the device comprising:
a flange used for support in an elongate main passage through which the physical quantities of the gas flow in a flow direction;
a generally rectangular circuit board on which a plurality of physical quantity sensors are mountable;
a generally rectangular circuit chamber that accommodates the circuit board; and
an elongate sub-passage in which a flow sensor is disposed, wherein:
a lattice-shaped rib is formed on a circuit board mounting portion of the circuit chamber,
the circuit chamber is located on an upstream side of the sub-passage, and
the circuit board is disposed with a longitudinal axis of the circuit board in parallel with a longitudinal axis of the circuit chamber, and in parallel with a longitudinal axis of the sub-passage, and in parallel with the direction of flow of the measured gas flowing through the main passage.

2. The physical quantity detection device according to claim 1 , wherein the circuit board has a shape in which an aspect ratio is larger than 1, and is mounted in the circuit chamber such that a longitudinal direction of the circuit board is an insertion direction.

3. The physical quantity detection device according to claim 2 , further comprising a circuit package that is sealed with resin so as to expose a measuring unit of the flow sensor,
wherein the circuit package is mounted on the circuit board such that a flow sensor side of the circuit package protrudes from a long side of the circuit board.

4. The physical quantity detection device according to claim 2 , wherein the flow sensor is disposed in a protrusion protruding from a long side of the circuit board to a sub-passage.

5. The physical quantity detection device according to claim 2 , wherein the flow sensor is disposed in the circuit board with a support that is a separate member being interposed between the flow sensor and the circuit board, and the support is provided so as to protrude from a long side of the circuit board to the sub-passage.

6. The physical quantity detection device according to claim 3 , wherein the circuit package has a narrowed portion in a place exposed to the sub-passage on a surface on the flow sensor side.

7. The physical quantity detection device according to claim 6 , wherein the circuit board includes a pressure sensor mounting portion, a flow sensor mounting portion, a humidity sensor mounting portion, and an intake air temperature sensor mounting portion in order closest to the flange.

8. The physical quantity detection device according to claim 6 , wherein in the circuit board, a pressure sensor, the flow sensor, a humidity sensor, and a temperature sensor are provided in order closest to the flange.

9. The physical quantity detection device according to claim 7 wherein an inlet opening of the sub-passage is formed on a downstream side of an upstream sidewall of the circuit chamber.

10. The physical quantity detection device according to claim 9 , wherein an intake air temperature sensor is disposed at the downstream side of the upstream sidewall and on an upstream side of the inlet opening of the sub-passage.

11. The physical quantity detection device according to claim 10 , further comprising a protector for the intake air temperature sensor,
wherein the intake air temperature sensor is disposed on an inlet opening projection surface of the sub-passage.

Assignees

• Hitachi Automotive Systems Ltd
• Hitachi Astemo Ltd

Inventors

• Uenodan Akira
• Miki Takahiro
• Yogo Takayuki
• Fatin Farhanah Binti Haridan
• Kono Tsutomu
• Tashiro Shinobu

Classifications

• G01K2205/02

  for measuring inlet gas temperature · CPC title

• G01F5/00 Primary

  Measuring a proportion of the volume flow · CPC title

• G01K13/024

  of moving gases · CPC title

• G01F15/046

  involving digital counting · CPC title

• G01N33/0036 Primary

  specially adapted to detect a particular component (physical analysis of gaseous biological material G01N33/497) · CPC title