Yaw Rate Sensor Antiparallel Vibration Spurious Mode Suppression
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Solution Overview
Problem
Existing yaw rate sensors suffer from spurious modes that result in false signals due to superimposed vibration modes, which are not effectively suppressed.
Innovation Solution
A yaw rate sensor design incorporating multiple Coriolis elements with a drive device and a detection device, where the Coriolis elements undergo antiparallel collinear drive vibration, and a coupling device transmits deflections orthogonally to the detection device, shifting spurious modes to higher frequencies for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional vibration modes are present in the yaw rate sensor, then the sensor can detect multiple motion parameters, but spurious modes result in false signals
Solution Approach 1:
The sensor separates detection functions into distinct Coriolis elements, each optimized for specific vibration modes. The first and second Coriolis elements detect different motion parameters through antiparallel vibration, while the third element detects rotational motion around the vibration axis, isolating detection functions to reduce spurious mode interference
Solution Approach 2:
Instead of trying to eliminate spurious modes directly, the invention inverts the approach by designing the vibration mode structure such that spurious modes occur at frequencies far from the detection modes. This frequency separation causes spurious modes to have minimal influence on detection accuracy
2Device complexity
If spurious modes are present in the frequency range, then the sensor structure is simpler, but false signals occur due to mode superposition
Solution Approach 1:
The invention changes the frequency parameter distribution by designing the Coriolis elements with specific geometric and material properties that create well-separated frequency ranges. The detection modes are positioned at distinct frequencies from spurious modes through careful design of the vibration-capable masses and elastic elements, reducing false signal excitation without complicating the overall structure
3Measurement precision
If multiple Coriolis elements are used for detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention merges multiple detection functions into a unified sensor structure where first, second, and third Coriolis elements work together in an integrated assembly. The elements share common mounting structures and evaluation electronics, achieving improved measurement precision through multi-element detection while controlling overall device complexity through functional integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses spurious modes by separating use and spurious modes in the frequency range, reducing false signal excitation and ensuring stable operation, with enhanced separation of modes through coupling mechanisms like springs.
Implementation Method 1
the Coriolis elements undergo a vibration in the opposite direction. In particular in the case of two Coriolis elements, the two Coriolis elements undergo an antiparallel collinear drive vibration
Implementation Method 2
The coupling device couples a deflection of the Coriolis element in the plane of vibration to the detection device in a direction orthogonal to the vibration. When the Coriolis element is appropriately deflected, a torque is thus transmitted from the Coriolis element to the at least one rotor, thus driving the at least one rotor
Implementation Method 3
When the body having the yaw rate sensor mounted thereon undergoes a rotary motion about a rotational axis which is not parallel to the vibration direction of the vibrating masses, and at the same time the two vibrating masses are excited to undergo their antiparallel vibrating motions, Coriolis forces act on the two vibrating masses
Data Source
AI summary
A yaw rate sensor includes: at least one Coriolis element; a drive device connected to the Coriolis element and configured to drive a vibration of the Coriolis element; a detection device having at least one rotor; and a coupling device connected to the detection device and to the Coriolis element. The coupling device is configured to couple a deflection in the plane of vibration of the Coriolis element to the detection device in a direction orthogonal to the vibration, so that when the Coriolis element is deflected a torque for driving the at least one rotor is transmitted from the Coriolis element to the at least one rotor.