Micromechanical Acceleration Sensor with Decoupled Frames
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Solution Overview
Problem
Existing micromechanical acceleration sensors are less effective at detecting both small and large accelerations, and are not cost-effective for precise detection of significantly different accelerations in various directions.
Innovation Solution
A micromechanical acceleration sensor design that integrates multiple component sensor elements with a decoupled frame structure, allowing for precise detection of accelerations greater than 25 g and less than 10 g, and enabling directional sensitivity through torsion springs and piezosensitive elements, with electrodes arranged to facilitate differential signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single acceleration sensor design is used, then it can detect accelerations in a specific range, but it cannot precisely detect both small and large accelerations simultaneously
Solution Approach 1:
The acceleration sensor is divided into multiple sensor elements, each optimized for specific acceleration ranges. First sensor elements detect accelerations in one direction, while second sensor elements detect accelerations in another direction, allowing the system to precisely measure both small and large accelerations across different ranges simultaneously.
Solution Approach 2:
The sensor housing and mounting structure serve multiple functions: they provide mechanical support, define the reference frame for acceleration measurement, and integrate multiple sensor elements. This multi-functional design enables a single device to detect accelerations in multiple directions and ranges without requiring separate sensor systems.
2Adaptability or versatility
If multiple sensor elements are integrated in one sensor, then detection capability is improved, but device complexity increases
Solution Approach 1:
Multiple sensor elements are merged into a single integrated sensor housing. The first and second sensor elements are mounted within the same housing structure, sharing common mechanical components and reference frames. This consolidation reduces the overall system complexity compared to using separate sensor units, while maintaining enhanced detection capabilities.
Solution Approach 2:
The housing structure is designed to universally support multiple sensor elements with different orientations and detection ranges. This universal mounting approach simplifies integration by providing a standardized platform that accommodates various sensor configurations without requiring complex individual mounting mechanisms for each element.
3Adaptability or versatility
If accelerations in different directions are detected, then measurement capability is improved, but manufacturing complexity increases
Solution Approach 1:
The first and second sensor elements are oriented asymmetrically within the housing, with their sensitive axes directed along different spatial directions. This asymmetric arrangement enables the detection of accelerations in multiple directions simultaneously. The manufacturing process accommodates this asymmetry through standardized mounting interfaces that simplify the integration of differently oriented sensors.
Solution Approach 2:
The housing design provides a universal mounting system that facilitates the integration of sensor elements with different orientations. This universal approach simplifies manufacturing by using standardized mechanical interfaces and alignment features, reducing the complexity that would otherwise arise from custom mounting solutions for each sensor orientation.
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 achieves precise detection of accelerations in multiple directions, including large and small values, with reduced complexity and cost, and is suitable for applications like airbag sensors and electronic stability programs in motor vehicles.
Implementation Method 1
with electrodes arranged to facilitate differential signal processing
Implementation Method 2
enabling directional sensitivity through torsion springs
Implementation Method 3
A micromechanical acceleration sensor design that integrates multiple component sensor elements with a decoupled frame structure, allowing for precise detection of accelerations
Data Source
AI summary
A micromechanical acceleration sensor, including at least one substrate, one or more frames, at least a first frame of which is suspended directly or indirectly on the substrate by at least one spring element, and is deflected with respect to the substrate when at least a first acceleration acts, and at least a first seismic mass which is suspended on the first frame or an additional frame by at least one spring element, and is deflected with respect to this frame when an acceleration acts which is, in particular, different from the first acceleration.