Piezoresistive Spring Sensor for Spurious Mode Suppression
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Solution Overview
Problem
Conventional mechanical components face interference from spurious modes in their frequency spectrum, which can disrupt control systems and are not effectively filtered without additional components, affecting the design simplicity and cost-effectiveness of the control system.
Innovation Solution
The mechanical component employs a sensor system with piezoresistive half bridges and Wheatstone full bridges to automatically filter out spurious modes, utilizing a combination of first and second sensor devices to generate an overall signal that minimizes undesirable frequencies, allowing for a cost-effective and interference-free control system without additional filtering components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional sensor systems are used without additional filtering components, then device complexity is reduced, but spurious modes in the frequency spectrum interfere with the control system
Solution Approach 1:
The patent converts the harmful spurious modes into beneficial filtering action by utilizing the natural resonant frequencies of the mechanical component itself. The sensor system is designed so that spurious modes generate signals that automatically cancel each other out in the evaluation, transforming the interference into a filtering mechanism that suppresses unwanted frequencies without additional components
Solution Approach 2:
The patent implements feedback by using the sensor system to detect both desired and spurious modes, then feeding this information back to the control system. The control system processes these signals to generate control commands that automatically compensate for and suppress spurious mode interference, creating a closed-loop system that continuously filters unwanted frequencies
2Object-affected harmful factors
If additional filtering components are added to suppress spurious modes, then spurious mode interference is reduced, but device complexity and cost increase
Solution Approach 1:
The patent eliminates the need for additional filtering components by converting the spurious modes themselves into the filtering mechanism. The sensor system and evaluation are designed to automatically suppress spurious mode frequencies through signal processing, transforming what would be harmful interference into a built-in filtering function that reduces device complexity
Solution Approach 2:
The patent enables the control system to suppress spurious modes using its own sensor system and signal evaluation, without requiring external filtering components. The system serves itself by using its inherent resonant frequencies and sensor outputs to automatically filter and suppress unwanted frequencies, eliminating the need for additional filtering hardware
3Reliability
If piezoresistive detection is used instead of capacitive or inductive detection, then signal linearity and interference-free operation are improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the sensor function with the mechanical structure by integrating piezoresistive sensors directly into the mechanical component. This combination allows the structural elements to serve dual purposes as both mechanical components and sensing elements, achieving interference-free signals with good linearity while simplifying the overall manufacturing process through 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
This solution enables a simple and cost-effective control system with improved sensitivity and offset, effectively suppressing spurious modes during quasi-steady-state oscillating motion, preventing interference that could impact the desired operation of the mechanical component.
Implementation Method 1
The present invention may thus make use of the advantages of the piezoresistive detection compared to a capacitive or an inductive detection
Implementation Method 2
Provided on connecting structure 16 is a Wheatstone full bridge 18, whose four resistors R1 through R4 are embedded on and/or in first spring 12a
Data Source
AI summary
A mechanical component has: a mounting; a movable part which, with the aid of at least one first spring and one second spring, is connected to the mounting in such a way that the movable part is movable about a rotational axis extending through a first anchoring area of the first spring on the mounting and a second anchoring area of the second spring on the mounting; a first sensor device with at least one first resistor which is situated on and/or in the first spring; and a second sensor device with at least one second resistor situated on and/or in the second spring. The first sensor device includes a first Wheatstone half bridge and the second sensor device includes a second Wheatstone half bridge. The first and second Wheatstone half bridges are connected to form a Wheatstone full bridge.