Yaw-Rate Sensor Four Coriolis Elements Interference
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Solution Overview
Problem
Conventional yaw-rate sensors are insensitive to angular accelerations about the y and z axes and cannot differentiate between Coriolis force and angular acceleration about the x axis, leading to interference signals.
Innovation Solution
A yaw-rate sensor design featuring four Coriolis elements connected via coupling elements, with specific configurations such as rocker structures and transformation means, allows for differential evaluation to isolate and suppress interference signals, shifting parallel interference modes to higher frequencies and enabling detection of yaw rates while minimizing interference from linear and angular accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors with two oscillating mass elements are used, then the sensor structure is simple, but the sensor cannot differentiate between Coriolis force and angular acceleration about the x axis, leading to interference signals
Solution Approach 1:
The sensor divides the measurement function into four separate Coriolis elements instead of using two mass elements. Each element independently measures Coriolis force in specific directions, allowing the system to segment the measurement of different acceleration components (yaw rate about x-axis, yaw rate about z-axis, and linear acceleration) and differentiate them through coordinated evaluation.
Solution Approach 2:
The patent transitions from planar oscillation to three-dimensional oscillation by arranging four Coriolis elements in a spatial configuration that allows measurement in multiple directions simultaneously. This dimensional expansion enables differentiation between Coriolis force and angular acceleration by measuring the same physical quantity from multiple angular perspectives.
2Reliability
If conventional sensors are used, then the device is simple to operate, but the sensor is insensitive to angular accelerations about y and z axes, causing interference signals
Solution Approach 1:
The sensor segments the detection of angular accelerations by assigning specific detection responsibilities to different Coriolis elements. The first and second elements detect angular acceleration about the y-axis, while the third and fourth elements detect angular acceleration about the z-axis, allowing the system to identify and compensate for these interference signals rather than being insensitive to them.
Solution Approach 2:
The patent implements a feedback mechanism where the signals from all four Coriolis elements are evaluated together to distinguish Coriolis force from interfering angular accelerations. The system uses the combined information to feedback-correct the measurement, eliminating interference signals and improving reliability.
3Object-affected harmful factors
If four Coriolis elements are used with differential evaluation, then interference signals are suppressed, but the device complexity increases
Solution Approach 1:
The patent merges the functions of four Coriolis elements into a unified measurement system where all elements work together to detect and suppress interference signals. By combining the output signals from all four elements through differential evaluation, the system achieves interference suppression that is greater than the sum of individual element contributions.
Solution Approach 2:
Each Coriolis element serves multiple functions: detecting Coriolis force in its specific direction, detecting angular acceleration about specific axes, and providing reference information for differential evaluation. This multi-functionality allows the increased device complexity to be justified by the comprehensive interference suppression capability.
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 differentiates between Coriolis force and angular acceleration, reducing interference signals and providing accurate yaw rate measurements, thus overcoming the limitations of conventional sensors.
Implementation Method 1
Micromechanical yaw-rate sensors for yaw rates about an axis which is parallel to the sensor plane (Z′ and yaw rate Qy) are normally designed as planarly oscillating masses or as masses rotating in the plane, which are subjected to a Coriolis force, which is perpendicular to the plane, when rotation occurs.
Data Source
AI summary
A yaw-rate sensor includes: a substrate having a main extension plane for detecting a yaw rate about a first axis extending parallel to the main extension plane; a first Coriolis element; a second Coriolis element; a third Coriolis element; and a fourth Coriolis element. The first Coriolis element and the fourth Coriolis element are drivable in the same direction parallel to a second axis extending parallel to the main extension plane and perpendicularly to the first axis. The first Coriolis element and the second Coriolis element are drivable in opposite directions parallel to the second axis. The first Coriolis element and the third Coriolis element are drivable in opposite directions parallel to the second axis.