Yaw Rate Sensor Rocker Structure Frequency Separation
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Solution Overview
Problem
Existing yaw rate sensors face challenges in achieving high detection accuracy due to interference modes that overlap with detection modes, leading to reduced measurement precision.
Innovation Solution
The implementation of a rocker structure coupled to the substrate via a spring element, which suppresses in-phase vibrations of Coriolis elements and shifts interference modes to higher frequencies, thereby increasing the frequency interval between detection and interference modes, enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a spring structure is used to couple Coriolis elements, then the device can detect yaw rates, but interference modes overlap with detection modes reducing measurement precision
Solution Approach 1:
The patent changes the structural parameters of the coupling mechanism by introducing a rocker structure with specific geometric characteristics. This structure modifies the stiffness distribution and natural frequencies of the system, separating the interference modes from the detection mode frequency, thereby eliminating mode overlap and improving measurement precision.
Solution Approach 2:
The rocker structure acts as an intermediary mechanism between the Coriolis elements and the substrate. It mediates the coupling between elements while filtering out interference modes, allowing the detection mode to operate independently at a distinct frequency, thus resolving the contradiction between detecting yaw rates and avoiding interference.
2Measurement precision
If the frequency of interference modes is close to detection modes, then the sensor structure is simpler, but measurement accuracy decreases due to mode interference
Solution Approach 1:
The patent modifies the frequency parameters of the sensor structure by introducing the rocker mechanism, which shifts the interference mode frequencies away from the detection mode frequency. This parameter change increases frequency separation, improving measurement accuracy while the rocker structure itself adds only moderate complexity that is justified by the performance gain.
3Ease of manufacture
If coupling springs are used to join Coriolis elements, then manufacturing is simpler, but in-phase vibrations cannot be suppressed effectively
Solution Approach 1:
The patent segments the coupling function into two distinct parts: the rocker structure that provides geometric constraint and frequency separation, and the coupling springs that provide elastic connection. This segmentation allows the springs to remain simple for manufacturing while the rocker structure handles the vibration suppression function, achieving both ease of manufacture and reliable suppression of in-phase vibrations.
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
This approach significantly improves the detection accuracy of yaw rates by minimizing the influence of interference modes on the detection process, resulting in a more precise measurement of yaw rates using standard micromechanical manufacturing methods.
Implementation Method 1
coupled to the substrate by the spring element
Implementation Method 2
a first and a second detection means detecting a deflection of the first and second Coriolis elements, based on a Coriolis force acting on the Coriolis elements perpendicularly to a first axis
Data Source
AI summary
A yaw rate sensor having a substrate, a first Coriolis element and a second Coriolis element is described, the first Coriolis element being excitable to a first vibration by first excitation means, and the second Coriolis element being excitable to a second vibration by second excitation means, and the first and second Coriolis elements being connected to one another by a spring structure, and the spring structure also including at least one rocker structure, the rocker structure being anchored on the substrate by at least one spring element.