Micromechanical Yaw Rate Sensor with Parasitic Vibration Suppression
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Solution Overview
Problem
Existing yaw rate sensors for vehicle stability control and rollover protection in convertibles face challenges in accurately detecting impending rollovers and maintaining aesthetic appeal, as traditional roll bars are either intrusive or require complex deployment mechanisms.
Innovation Solution
A micromechanical yaw rate sensor with a compact design featuring seismic masses, actuator units, and quadrature trimming and resetting mechanisms, which suppress parasitic vibrations and provide precise yaw rate measurements, allowing for timely detection of rollover events without compromising vehicle aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional roll bars are installed in convertibles for rollover protection, then occupant safety is improved, but vehicle aesthetics are significantly impaired
Solution Approach 1:
The invention divides the protective function into separate segments: the aesthetic soft top remains intact while separate inflatable airbag structures provide the protective function. This segmentation allows the aesthetic component and safety component to be independently optimized.
Solution Approach 2:
The protective function is extracted from the traditional rigid roll bar structure and implemented through separate inflatable airbag elements that can be deployed only when needed, leaving the vehicle aesthetic unchanged during normal operation.
2Measurement precision
If accurate yaw rate detection is implemented for timely rollover detection, then occupant protection is improved, but device complexity increases
Solution Approach 1:
The yaw rate sensor is designed to serve multiple functions: it provides accurate yaw rate measurement for rollover detection, and simultaneously serves as part of the vehicle's stability control system. This multi-functionality reduces overall system complexity by consolidating measurement capabilities.
Solution Approach 2:
The invention replaces complex mechanical deployment mechanisms with electronically controlled inflatable structures actuated by gas generators, simplifying the overall system while maintaining protective functionality.
3Measurement precision
If parasitic vibrations are suppressed in the sensor, then measurement precision is improved, but device complexity increases due to additional actuator units
Solution Approach 1:
The quadrature trimming actuator units are integrated directly into the seismic mass structure, merging the vibration suppression function with the existing sensor components rather than adding separate external systems.
Solution Approach 2:
The actuator units are controlled by electronic circuits that automatically detect and compensate for parasitic vibrations in real-time, allowing the system to self-regulate without external intervention or complex mechanical adjustment mechanisms.
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 sensor effectively enhances vehicle safety by accurately detecting yaw rates and rollovers, improving occupant protection while maintaining a sleek design, and reduces interference from external factors and parasitic vibrations.
Implementation Method 1
an electrical actuator voltage is present, which causes or causes an electrical force with which the deflection behavior of the seismic mass can be influenced
Implementation Method 2
a yaw rate sensor measures the actual value of the yaw rate that occurs as a reaction to the driving maneuver
Data Source
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AI summary
The invention relates to a micromechanical rotation rate sensor comprising at least one substrate, wherein the rotation rate sensor comprises at least one first and one second seismic mass, which are coupled to each other by means of at least one coupling beam, and wherein the rotation rate sensor is designed in such a way that the rotation rate sensor can detect rotation rates about at least one first and one second sensitive axis, wherein each seismic mass is associated with at least one actuator unit, with which the deflection behavior of the seismic mass can be influenced.