Yaw-rate sensor

• US 9,593,949 B2
• Filed: 12/30/2015
• Issued: 03/14/2017
• Est. Priority Date: 11/15/2007
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Ohms, Torsten, Neul, Reinhard, Classen, Johannes, Kuhlmann, Burkhard, Franke, Axel, Kohn, Oliver, Meisel, Daniel Christoph, Hauer, Joerg, Gomez, Udo-Martin, Kehr, Kersten
• Primary Examiner(s): CHAPMAN JR, JOHN E
• Application Number:
  US14/984,153
• Publication Number:
  US 20160109236A1
• Time in Patent Office: 440 Days
• Field of Search: 735/041.2
• US Class Current: 1/1
• CPC Class Codes: F16F 1/025 characterised by having a particular shape F16F1/04, F16F1/14, F16F1/18, F16F1/32, F16F1/34 take precedence
• CPC Class Codes: G01C 19/574 the devices having two sensing masses in anti-phase motion
• CPC Class Codes: G01C 19/5747 each sensing mass being connected to a driving mass, e.g. driving frames
• CPC Class Codes: G01P 3/44 for measuring angular speed G01P3/56 takes precedence

Abstract

A yaw-rate sensor having a substrate and a plurality of movable substructures that are mounted over a surface of the substrate, the movable substructures being coupled to a shared, in particular, central spring element, means being provided for exciting the movable substructures into a coupled oscillation in a plane that extends parallel to the surface of the substrate, the movable substructures having Coriolis elements, means being provided for detecting deflections of the Coriolis elements induced by a Coriolis force, a first Coriolis element being provided for detecting a yaw rate about a first axis, a second Coriolis element being provided for detecting a yaw rate about a second axis, the second axis being oriented perpendicularly to the first axis.

Claims

1. A sensor comprising:

a substrate;

a plurality of movable masses that are mounted over a surface of the substrate and that include at least a first Coriolis element and a second Coriolis element;

a frame;

a plurality of detectors configured to detect deflections of the Coriolis elements, wherein the detected deflections include (a) detected deflections of at least the first Coriolis element, which are caused by a Coriolis force generated due to, and associated by the sensor with, an input motion about a first axis and (b) detected deflections of at least the second Coriolis element, which are caused by a Coriolis force generated due to, and associated by the sensor with, an input motion about a second axis that is perpendicular to the first axis;

a first spring that directly connects the first Coriolis element to the second Coriolis element; and

at least one second spring via which the frame is connected to at least one of the Coriolis elements, which the frame surrounds.

2. The sensor of claim 1, wherein:

the plurality of detectors are configured to detect the deflections when the masses are set into a driven mode by drive structures; and

the frame has at least one of the drive structures.

3. The sensor of claim 2, wherein, in the driven mode, the masses oscillate in a plane that extends parallel to the surface of the substrate.

4. The sensor of claim 1, wherein:

the plurality of detectors are configured to detect the deflections when the masses are set into a driven mode by a driver arrangement; and

the frame has at least one drive structure of the driver arrangement.

5. A sensor comprising:

a substrate;

a plurality of movable masses that are mounted over a surface of the substrate;

a frame;

a plurality of detectors configured to detect deflections of the movable masses, the deflections including (a) deflections caused by a Coriolis force generated due to, and associated by the sensor with, an input motion about a first axis and (b) deflections caused by a Coriolis force generated due to, and associated by the sensor with, an input motion about a second axis that is perpendicular to the first axis;

a first spring that directly connects two of the masses to each other; and

at least one second spring via which the frame is connected to at least one of the two masses, to which the frame is external.

6. The sensor of claim 5, wherein the frame surrounds the at least one of the two masses.

7. The sensor of claim 5, wherein the detectors are configured to perform the detections when the movable masses are set into a driven mode by a driver arrangement.

8. The sensor of claim 7, wherein the frame has at least one drive structure of the driver arrangement.

9. The sensor of claim 8, wherein the masses oscillate in a plane that extends parallel to the surface of the substrate when the masses are in the driven mode.

10. The sensor of claim 9, wherein the oscillation includes a first pair of the masses oscillating antiparallel to each other, and a second pair of the masses oscillating antiparallel to each other.

11. The sensor of claim 5, wherein the detectors are transducers mounted on the substrate and detect changes in distances between the transducers and at least portions of the masses.

12. The sensor of claim 11, wherein the transducers include electrodes.

13. The sensor of claim 5, wherein the plurality of masses are coupled to the substrate via a shared spring arrangement.

14. The sensor of claim 13, wherein the first spring is part of the shared spring arrangement.