SET-UP FOR MEASURING A ROTATIONAL SPEED, IN PARTICULAR, OF A TURBOCHARGER OF A MOTOR VEHICLE

• US 20170031014A1
• Filed: 07/29/2016
• Published: 02/02/2017
• Est. Priority Date: 07/31/2015
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Bannwarth, Stephan, Seidel, Juergen, Lerchenmueller, Klaus
• Granted Patent: US 10,459,077 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01M 15/02 Details or accessories of testing apparatus
• CPC Class Codes: G01S 13/58 Velocity or trajectory determination systems; Sense-of-movement determination systems
• CPC Class Codes: G01S 13/88 Radar or analogous systems specially adapted for specific applications electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00
• CPC Class Codes: G01S 7/027 Constructional details of housings, e.g. form, type, material or ruggedness

Abstract

For a set-up for measuring a rotational speed of a turbocharger of a motor vehicle, including at least one antenna for generating and/or receiving electromagnetic radiation and an electronic module having at least one electric and/or electronic component and being electrically connected to the antenna. The set-up further includes a housing shell made at least partially of laser-absorbing material and having an inner chamber, and a housing cover, which rests on at least one laser-absorbing contact surface of the housing shell and covers the inner chamber of the housing shell at least partially, and at least sections of which are made of material transparent to laser radiation; the antenna and the electronic module being situated in the inner chamber of the housing shell, and at least sections of the housing cover being welded to the housing shell at the at least one contact surface using a laser-welded seam.

Claims

1. A set-up for measuring a rotational speed of a turbocharger of a motor vehicle, comprising:

at least one antenna for at least one of generating and receiving electromagnetic radiation;

an electronic module, which includes at least one of an electric and electronic component, the electronic module being electrically connected to the antenna;

a housing shell which is made at least partially of laser-absorbing material and includes an inner chamber; and

a housing cover having a first side which abuts against at least one laser-absorbing contact surface of the housing shell and at least partially covers the inner chamber of the housing shell, and at least sections of the housing cover are made of material transparent to laser radiation, the antenna and the electronic module being situated in the inner chamber of the housing shell, and at least sections of the housing cover being welded to the housing shell at the at least one contact surface, using a laser-welded seam.

2. The set-up as recited in claim 1, wherein at least sections of the housing cover are made of a material, which is transparent to electromagnetic radiation having a frequency of three hundred megahertz to three hundred gigahertz.

3. The set-up as recited in claim 1, wherein at least sections of the housing cover are made of a material, which is transparent to electromagnetic radiation having a frequency of one gigahertz to sixty gigahertz.

4. The set-up as recited in claim 1, wherein at least sections of the housing cover are made of a material, which is transparent to electromagnetic radiation having a frequency of twenty-one gigahertz to twenty-seven gigahertz.

5. The set-up as recited in claim 1, wherein the housing cover is formed as a plate having a first side facing the housing shell and a second side facing away from the housing shell, the plate having a first thickness, and wherein the housing cover has at least one window-like depression having a second thickness less than the first thickness.

6. The set-up as recited in claim 5, wherein in the depression, the housing cover has a second thickness which corresponds to one quarter of a wavelength of an electromagnetic wave, which wavelength is generated by an electromagnetic wave having a frequency between twenty-one gigahertz and twenty-seven gigahertz in the material of the housing cover.

7. The set-up as recited in claim 5, wherein the depression and the antenna are positioned relative to one another in such a manner, that a vertical projection of the antenna onto the first side of the housing cover lies at least partially in the depression.

8. The set-up as recited in claim 1, wherein the housing cover has a first thickness throughout, which corresponds to one quarter of a wavelength of an electromagnetic wave, which wavelength is generated by an electromagnetic wave having a frequency between twenty-one gigahertz and twenty-seven gigahertz in the material of the housing cover.

9. The set-up as recited in claim 1, further comprising:

at least one circuit board situated in the inner chamber of the housing shell, and at least one of;

i) the at least one antenna, and ii) the electronic module, being situated at least partially on the circuit board.

10. The set-up as recited in claim 1, further comprising:

a holding device, wherein a second side of the housing cover is on the holding device on an intake pipe of a turbocharger of a motor vehicle, and an alignment structure is formed on the housing cover so as to be complementary to a complementary structure formed on the holding device, so that by engagement of the alignment structure with the complementary structure, the housing cover is aligned on the holding device in a predetermined position.

11. The set-up as recited in claim 10, wherein one of the alignment structure or the complementary structure is formed to have at least one pin.

12. The set-up as recited in claim 1, wherein in a plane of the housing cover, spatial dimensions of the housing cover are greater than spatial dimensions of the housing shell, so that the housing cover has at least one projection with respect to the housing shell.

13. The set-up as recited in claim 1, wherein the housing cover is manufactured as a composite part including a frame part made of a material transparent to laser radiation and at least one microwave window, which is set into the frame part and is transparent to electromagnetic radiation having a frequency of three hundred megahertz to three hundred gigahertz.

14. The set-up as recited in claim 1, wherein the housing cover is manufactured as a composite part including a frame part made of a material transparent to laser radiation and at least one microwave window, which is set into the frame part and is transparent to electromagnetic radiation having a frequency of one gigahertz to sixty gigahertz.

15. The set-up as recited in claim 1, wherein the housing cover is manufactured as a composite part including a frame part made of a material transparent to laser radiation and at least one microwave window, which is set into the frame part and is transparent to electromagnetic radiation having a frequency of twenty-one gigahertz to twenty-seven gigahertz.

16. The set-up as recited in claim 1, wherein at least one plug connector is formed on the housing shell.

17. A method for manufacturing a set-up for measuring a rotational speed of a turbocharger of a motor vehicle, the method comprising:

providing an antenna for at least one of generating and receiving electromagnetic radiation and an electronic module, and at least one electronic component electrically connected to the antenna;

providing a housing shell;

positioning the antenna and the electronic module in an inner chamber of the housing shell;

placing a housing cover on a laser-absorbing contact surface of the housing shell;

welding the housing shell to the housing cover at the contact surface, the housing shell being at least partially made of a laser-absorbing material, and at least sections of the housing cover being made of a material transparent to laser radiation, and at least sections of the housing shell being welded to the contact surface, using a laser beam guided through the housing cover.

18. The method as recited in claim 17, wherein the material of the housing cover is transparent to electromagnetic radiation having a frequency of three hundred megahertz to three hundred gigahertz.

19. The method as recited in claim 17, wherein the material of the housing cover is transparent to electromagnetic radiation having a frequency of one gigahertz to sixty gigahertz.

20. The method as recited in claim 17, wherein the material of the housing cover is transparent to electromagnetic radiation having a frequency of twenty-one gigahertz to twenty-seven gigahertz.