Measuring device for measuring the mass of a medium flowing in a line

• US 6,332,356 B1
• Filed: 12/07/1999
• Issued: 12/25/2001
• Est. Priority Date: 04/08/1998
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Mueller, Wolfgang, Hecht, Hans
• Primary Examiner(s): PATEL, HARSHAD R
• Application Number:
  US09/445,401
• Time in Patent Office: 749 Days
• Field of Search: 732/02, 732/025, 732/042.2, 731/182
• US Class Current: 73/202.5
• CPC Class Codes: G01F 1/6842 with means for influencing the fluid flow
• CPC Class Codes: G01F 1/72 Devices for measuring pulsing fluid flows
• CPC Class Codes: G01F 15/12 Cleaning arrangements; Filters
• CPC Class Codes: G01F 5/00 Measuring a proportion of the volume flow

Abstract

A measuring device for measuring the mass of a medium flowing in a flow line, in particular the aspirated air mass of an internal combustion engine, including a measuring element bathed by the flowing medium and disposed in a flow conduit of the measuring device provided in the flow line. The flow conduit extends in a primary flow direction between an inlet opening that communicates with the flow line and at least one outlet opening that discharges into the flow line downstream of the inlet opening. The flow conduit branches at a first dividing point, disposed between the inlet opening and the measuring element, into a measuring conduit, in which the measuring element is disposed, and a first bypass conduit, which bypasses the measuring element in the primary flow direction.

Claims

1. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, and a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), the flow conduit (10) having a first curved portion (24) at least between the inlet opening (12) and the first dividing point (15), the measuring conduit (20) adjoining an inner region (26) with a relatively lesser radius of curvature of the first curved portion (24) in the primary flow direction (19), and the first bypass conduit (22) adjoins a peripheral region (25) with a relatively large radius of curvature of the first curved portion (24) in the primary flow direction (19).

2. The measuring device according to claim 1, in which the measuring conduit (20) is radially offset from the inlet opening (12) relative to a longitudinal axis (3) of the flow line (2).

3. The measuring device according to claim 1, in which a partition (27) is disposed in the primary flow direction (19) downstream of the first dividing point (15), between the measuring conduit (20) and the first bypass conduit (22).

4. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, and a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), the measuring conduit (20) being radially offset from the inlet opening (12) relative to a longitudinal axis (3) of the flow line (2).

5. The measuring device according to claim 4, in which a partition (27) is disposed in the primary flow direction (19) downstream of the first dividing point (15), between the measuring conduit (20) and the first bypass conduit (22).

6. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), and a partition (27) disposed in the primary flow direction (19) downstream of the first dividing point (15), between the measuring conduit (20) and the first bypass conduit (22).

7. The measuring device according to claim 6, in which the measuring conduit (20) and the first bypass conduit (22) are reunited in the primary flow direction (19) downstream of the measuring element (21).

8. The measuring device according to claim 7, in which the partition (27) is streamlined in cross-sectional profile.

9. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, and a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), the measuring conduit (20) and the first bypass conduit (22) extending substantially parallel to one another in the primary flow direction (19) downstream of the first dividing point (15) and discharging at a common outlet opening or at two adjacent outlet openings (13, 14).

10. The measuring device according to claim 9, in which the inlet opening 12 is disposed on a leading end 29 of the measuring device 1, and the outlet openings (13, 14) of the measuring conduit (20) and the first bypass conduit (22) are disposed on a trailing end (28) of the measuring device, located opposite the leading end (29).

11. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, and a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), the measuring conduit (20) and the first bypass conduit (22) extending with contrary curvature in a region downstream of the first dividing point (15) in the primary flow direction (19) and discharging at spatially separated outlet openings (13, 14).

12. The measuring device according to claim 11, in which the inlet opening 12 is disposed on a leading end 29 of the measuring device 1, and the outlet openings (13, 14) of the measuring conduit (20) and the first bypass conduit (22) are disposed on a trailing end (28) of the measuring device, located opposite the leading end (29).

13. A measuring device (1) for measuring the mass of a medium flowing in a flow line (2) as an aspirated air mass of an internal combustion engine, comprising a measuring element (21) bathed by a portion of the flowing medium and disposed in a flow conduit (10) of the measuring device (1) provided in the flow line (2), wherein the flow conduit (10) extends in a primary flow direction (19) between an inlet opening (12) that communicates with the flow line (2) and at least one outlet opening (13;

30) that discharges into the flow line (2) downstream of the inlet opening (12), in which the flow conduit (10) branches at a first dividing point (15), disposed between the inlet opening (12) and the measuring element (21), into a measuring conduit (20), in which the measuring element (21) is disposed, and a first bypass conduit (22), which bypasses the measuring element (21) in the primary flow direction (19), the flow conduit (10) branching, at a second dividing point (50) disposed between an outlet opening (13) and the measuring element (21), into the measuring conduit (20) having the measuring element (21) and a second bypass conduit (51), which bypasses the measuring element (21) counter to the primary flow direction (19).

14. The measuring device according to claim 13, in which the flow conduit (10) has a second curved portion (53) between the outlet opening (13) and the second dividing point (50), and that the measuring conduit (20) adjoins an inner region (54) with a relatively lesser radius of curvature of the second curved portion (53) counter to the primary flow direction (19), and the second bypass conduit (51) adjoins a peripheral region (55) with a relatively large radius of curvature of the second curved portion (53) counter to the primary flow direction (19).

15. The measuring device according to claim 14, in which the first curved portion (24) and the second curved portion (53) of the flow conduit (10) are embodied substantially symmetrically to one another.

16. The measuring device according to claim 15, in which the measuring conduit (20) is embodied as curved in at least some portions, and that the first curved portion (24) and the second curved portion (53) of the flow conduit (10) together with the curved measuring conduit (20) make a loop that encloses an angle of approximately 360°

.

17. The measuring device according to claim 14, in which the measuring conduit (20) is embodied as curved in at least some portions, and that the first curved portion (24) and the second curved portion (53) of the flow conduit (10) together with the curved measuring conduit (20) make a loop that encloses an angle of approximately 360°

.

18. The measuring device according to claim 14, in which the second bypass conduit (51) discharges into the flow line (2) at a side face of the measuring device (1) disposed substantially parallel to a longitudinal axis (3) of the flow line (2).

19. The measuring device according to claim 13, in which the second bypass conduit (51) discharges into the flow line (2) at a side face of the measuring device (1) disposed substantially parallel to a longitudinal axis (3) of the flow line (2).