Flap device for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10954866-B2
Application number	US-201716340692-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	Oct 12, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A flap device for an internal combustion engine which includes a flow housing with a housing wall which delimits a flow-through duct. The flap device includes a shaft mounted in the flow housing, a flap body rotatably mounted on the shaft, an actuator for the shaft, and a pressure measurement point. The pressure measurement point is arranged in a duct section of the flow housing so that the flap body traverses the pressure measurement point when rotating, and in a region of the flow housing remote from the shaft when viewed in a circumferential direction of the housing wall. A flap surface of the flap body is directed towards the pressure measurement point and is curved so that, in each rotary position, a tangent arranged at the position of the curved flap surface having a shortest distance to an opposite wall surface of the flow housing is parallel thereto.

First claim

What is claimed is:

1. A flap device for an internal combustion engine, the internal combustion engine comprising a flow housing which comprises a housing wall which is configured to delimit a flow-through duct, the flap device comprising:
a shaft mounted in the flow housing;
a flap body rotatably mounted on the shaft, the flap body comprising a curved flap surface and a flap wing on which the curved flap surface is formed;
an actuator configured to actuate the shaft;
a pressure measurement point arranged,
in a duct section of the flow housing so that the flap body traverses the pressure measurement point when rotating, and
in a region of the flow housing which is remote from the shaft when viewed in a circumferential direction of the housing wall,

wherein,
in a cross section perpendicular to the shaft and running through the pressure measuring point, the curved flap surface directed towards the pressure measurement point is curved so that, in each rotary position of the flap body, a tangent arranged at the position of the curved flap surface having a shortest distance to an opposite wall surface of the flow housing is parallel to the opposite wall surface of the flow housing,
the opposite wall surface of the flow housing comprises a suspension point arranged thereon,
the flap wing comprises a middle area,
the curved flap surface is only formed in the middle area of the flap wing when viewed along the shaft,
the opposite wall surface of the flow housing comprises a curvature, and
the curvature of the opposite wall surface corresponds to a curvature of the curved flap surface in each respective rotary position of the flap body as viewed in a circumferential direction from the suspension point.

2. The flap device as recited in claim 1 , wherein,
the flap body further comprises a swivel area, and
the tangent arranged at the position of the curved flap surface having the shortest distance to the opposite wall surface of the flow housing is arranged, in each rotary position of the flap body, in a same axial flow cross section of the duct in the swivel area of the flap body.

3. The flap device as recited in claim 2 , wherein the same axial flow cross section of the duct is arranged directly downstream of the pressure measurement point.

4. The flap device as recited in claim 1 , wherein
the flap wing, in a closed state of the flap device, is arranged directly downstream of the pressure measurement point on the suspension point on the opposite wall surface of the flow housing and is configured to move away from the pressure measurement point, and thus away from a closing position of the duct, when the flap body rotates.

5. The flap device as recited in claim 1 , further comprising:
a first duct section which comprises a first flow cross section;
a second duct section arranged downstream of the first duct section, the second duct section comprising a second flow cross section which is reduced compared to the first flow cross section; and
a third duct section arranged downstream of the second duct section in which the duct continues with the second flow cross section,
wherein,
the shaft is arranged in the third duct section, and
the pressure measurement point is formed in the third duct section.

6. The flap device as recited in claim 5 further comprising:
at least one pressure sensor; and
a further pressure measurement point arranged in the first duct section,
wherein,
the pressure measurement point and the further pressure measurement point are each formed as an opening in the flow housing, and
each of the openings are configured to be in a fluid communication with the at least one pressure sensor.

7. The flap device as recited in claim 1 , wherein,
the shaft comprises bearing positions in the flow housing, and
the pressure measurement point is formed downstream of the bearing positions of the shaft in the flow housing.

8. The flap device as recited in claim 6 , wherein,
a respective one of the at least one pressure sensor is arranged in each of the openings.

9. The flap device as recited in claim 6 , wherein the at least one pressure sensor is a differential pressure sensor.

10. The flap device as recited in claim 6 , wherein,
the actuator comprises a control electronic, and
the control electronic of the actuator is electrically coupled with the at least one pressure sensor.

11. The flap device as recited in claim 10 , wherein an evaluation unit which is configured to calculate a gas flow from measurement values of the at least one pressure sensor is electronically coupled with the at least one pressure sensor and with the control electronic of the actuator.

12. The flap device as recited in claim 11 , wherein the actuator is controlled based on the measurement values of the at least one pressure sensor.

13. The flap device as recited in claim 10 , wherein the control electronic of the actuator and the at least one pressure sensor are each arranged in an actuator housing that is mounted on or integrally formed with the flow housing.

Assignees

• Pierburg Gmbh

Inventors

• Capan Alpay
• Dellen Franz
• Antoni Christian
• Bendig Ahu
• Oezcan Hasan
• Herten Philipp

Classifications

• F02M35/1038

  for temperature or pressure · CPC title

• F16K1/222

  Shaping of the valve member · CPC title

• F02D2009/0201

  Arrangements; Control features; Details thereof · CPC title

• F02D9/101 Primary

  Special flap shapes, ribs, bores or the like · CPC title

• F02D2400/18

  Packaging of the electronic circuit in a casing · CPC title