Device for determining at least one parameter of a flowing medium

• US 20030046977A1
• Filed: 09/03/2002
• Published: 03/13/2003
• Est. Priority Date: 08/30/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Marberg, Henning, Konzelmann, Uwe, Lenzing, Thomas
• Granted Patent: US 6,851,309 B2
• Time in Patent Office: Days
• US Class Current: 73/23.32
• CPC Class Codes: F02D 41/187 using a hot wire flow sensor
• CPC Class Codes: F02M 35/021 Arrangements of air flow meters in or on air cleaner housings
• CPC Class Codes: G01F 1/6842 with means for influencing the fluid flow
• CPC Class Codes: G01F 15/12 Cleaning arrangements; Filters
• CPC Class Codes: G01F 5/00 Measuring a proportion of the volume flow

Abstract

Devices for determining at least one parameter of a flowing medium according to the related art do not offer sufficient protection of a measuring element from contamination by foreign particles. A device (1) is disclosed having an element (55), for example in the form of a bulge (60), in the channel (20) in which the measuring element (10) is positioned, which deflects the foreign particles and thus protects the measuring element (10).

Claims

1. A device (1) for determining at least one parameter of a medium, comprising a gas-particle mixture, particularly the intake air for an internal combustion engine, flowing in a line (2) along a main flow direction (3), having a measuring housing (6) provided in the line (2), having at least one channel (20) positioned in the measuring housing (6) and having at least one measuring element (10), located in the channel (20), around which the medium flows, wherein at least one element (55) for deflecting particles and liquids is positioned around or in the measuring housing (6), upstream from the measuring element (10).

2. The device according to claim 1, wherein the at least one element (55) for deflecting particles and liquids in the channel (20) is formed by at least one bulge (60).

3. The device according to claim 2, wherein the bulge (60) forms an angle of intersection (β

) between 90° and

0°

with the main flow direction (3).

4. The device according to claim 1 or 2, wherein the at least one element for deflecting particles and liquids (55) is formed by at least one rejection grid (88).

5. The device according to claim 1, wherein at least one outlet opening (67) for particles and liquids is provided between the at least one element (55) and the measuring element (10).

6. The device according to one or more of claims 1, 2, 3, or 5, wherein the channel (20) has a wall (35), and the wall (35) has an indentation (63) pointing outward at approximately the same axial length as the at least one element (55) and opposite to it.

7. The device according to claim 6, wherein the element (55) is at least one bulge (60), and the indentation (63) has a shape corresponding to that of the bulge (60).

8. The device according to one of claims 1, 2, or 4 to 6, wherein the flowing medium has a main flow direction (3), and a forward part (75) of the channel (20) is offset in relation to the rear part (77), parallel to the main flow direction (3).

9. The device according to claim 1 or 5, wherein the channel (20) has at least one outlet opening (12, 67), and the at least one outlet opening (12, 67) has at least one oil rejection grid (94).

10. The device according to one of claims 1, 2, 4 to 6, 8, or 9, wherein a wall (35) of the channel (20) is made of at least two parts, and a first part (80) of the channel (20) is formed by a sleeve (84) positioned on the measuring housing (6).

11. The device according to claim 10, wherein at least one rejection grid (88) is positioned in the sleeve (84).

12. The device according to one of claims 1, 2, 4 to 6, 8 to 10, wherein the channel (20) has the following properties:

the channel (20) is divided into an inlet channel (13), a deflection channel (15), and an outlet channel (19);

the channel (20) has an inlet opening (11), which the inlet channel (13) adjoins, which the deflection channel (15) adjoins, into which the medium flows from the inlet channel (13) and is deflected, in order to then flow through the outlet channel (19) to at least one outlet opening (12), on an outer surface (21) of the measuring housing (6), which discharges into the line (2).

13. The device according to claim 12, wherein at least one pulsation channel (92) adjoins the outlet opening (12).

14. The device according to claim 12, wherein the pulsation channel (92) has at least one oil rejection grid (94).