Plug-in sensor having improved fluid mechanics

• US 8,205,493 B2
• Filed: 08/21/2007
• Issued: 06/26/2012
• Est. Priority Date: 09/27/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Mais, Torsten, Konzelmann, Uwe, Gmelin, Christoph
• Primary Examiner(s): PATEL, HARSHAD R
• Application Number:
  US12/310,938
• Publication Number:
  US 20100064799A1
• Time in Patent Office: 1,771 Days
• Field of Search: None
• US Class Current: 73/202.5
• CPC Class Codes: G01F 1/6842 with means for influencing the fluid flow

Abstract

A plug-in sensor for determining an aspirated air mass of an internal combustion engine flowing through a flow pipe has a plug part, which is able to be introduced into the streaming medium with a specified orientation to the main flow direction. Provided in this plug part is at least one flow channel having at least one inlet opening and at least one outlet opening. Accommodated in the at least one flow channel is at least one sensor for determining the at least one parameter. The plug part has a rounded inflow side, which points counter to the main flow direction. The plug part at least partially has an airfoil profile, which is designed such that an asymmetrical flow profile of the fluid medium comes about when the plug part is introduced into the streaming fluid medium.

Claims

1. A plug-in sensor for determining at least one parameter of a flowing air mass of an internal combustion engine flowing through a flow pipe in a main flow direction, comprising:

a plug part configured to be introduced into the flowing air mass with a specified alignment to the main flow direction, wherein the plug part has at least one flow channel having at least one inlet opening and at least one outlet opening;

a bypass flow channel branching off the at least one flow channel in the main flow direction; and

at least one sensor for determining the at least one parameter, wherein the at least one sensor is accommodated in the bypass flow channel of the plug part;

wherein the plug part has a rounded inflow side directed counter to the main flow direction, and wherein the at least one flow channel has the at least one inlet opening in a region of the rounded inflow side, wherein the plug part has at least one airfoil profile configured in such a way that an asymmetrical flow profile of the air mass results on different sides of the plug part when the plug part is introduced into the flowing air mass, and wherein the bypass flow channel and the at least one sensor are contained within the at least one airfoil profile.

2. The plug-in sensor as recited in claim 1, wherein the at least one outlet opening is disposed laterally on the at least one airfoil profile.

3. The plug-in sensor as recited in the claim 1, wherein the at least one flow channel has at least one main channel having at least one main flow outlet opening, and the at least one bypass channel has at least one bypass outlet opening, and wherein at least one of the at least one main flow outlet opening and the at least one bypass outlet opening is disposed laterally on the at least one airfoil profile.

4. The plug-in sensor as recited in claim 3, wherein the at least one airfoil profile has a first side having the at least one outlet opening and a second side without the at least one outlet opening, the airfoil profile being configured such that, when the plug part is introduced into the flowing air mass, a flow profile results in which the velocity of the flowing air mass is higher on the first side than on the second side.

5. The plug-in sensor as recited in claim 3, wherein, on a side facing away from the flow when the plug-in sensor is introduced into the flowing air mass, the at least one airfoil profile has a cut-off rear which is essentially perpendicular to the main flow direction.

6. The plug-in sensor as recited in claim 3, wherein, when the plug part is introduced into the flowing air mass, the at least one airfoil profile has an angle of incidence α

of between 0° and

7°

to the main flow direction.

7. The plug-in sensor as recited in claim 3, wherein the at least one airfoil profile has a profile curvature of between 0% and 10%.

8. The plug-in sensor as recited in claim 3, wherein the at least one airfoil profile is configured in such a way that, when the plug part is introduced into the flowing air mass, at least a local pressure minimum occurs in at least one separation zone on at least one side of the at least one airfoil profile, the at least one outlet opening being disposed at least partially in the at least one separation zone.

9. The plug-in sensor as recited in claim 8, wherein the at least one airfoil profile has at least one separation element on at least one side, the at least one separation element being configured to induce at least a local pressure minimum when the plug part is introduced into the flowing air mass.

10. The plug-in sensor as recited in claim 9, wherein the at least one separation element has at least one of the following profiles:

a bent profile having a discontinuous gradient, the gradient of the at least one airfoil profile changing in a discontinuous manner;

a stepped profile having at least one step in the at least one airfoil profile;

a hill profile, the gradient of the at least one airfoil profile in the hill profile making a continuous change from a positive gradient to a negative gradient from the inflow side toward the discharge side, the curvature in the region of the negative gradient being more pronounced than in the region of the positive gradient;

a turning profile having at least one turning point in the extension of the at least one airfoil profile.

11. The plug-in sensor as recited in claim 10, wherein a bent profile is provided, the airfoil profile on the inflow side in front of the bent profile extending in a curved manner at a positive gradient, and the at least one airfoil profile on a downstream side behind the bent profile extending at a negative gradient.

12. The plug-in sensor as recited in claim 9, wherein the at least one outlet opening is at least one of:

a) at least partially disposed in the region of the at least one separation element; and

b) at least partially disposed downstream from the at least one separation element.

13. The plug-in sensor as recited in claim 1, wherein the bypass flow channel branches off the at least one flow channel in the main flow direction at a nose directed toward the main flow direction and the bypass flow channel includes a bypass outlet opening disposed in a lower pressure region of the at least one airfoil profile to provide a suction effect.