Yaw-Rate Sensor with Compensating Mass for Interference Rejection
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Solution Overview
Problem
Conventional yaw-rate sensors are susceptible to interference from linear and rotational accelerations, leading to false signals, especially when these accelerations occur at frequencies matching the sensor's drive frequency and in phase with Coriolis forces.
Innovation Solution
The implementation of compensating weights and rocker-type coupling elements that deflect opposite to the Coriolis oscillator, neutralizing inertial forces caused by linear and rotational accelerations, ensuring the Coriolis mass remains undisturbed and reducing interference susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional yaw-rate sensors use two oscillating mass elements driven to an antiparallel mode, then the sensor can detect yaw rate through Coriolis force, but the sensor becomes susceptible to interference from rotational accelerations and linear accelerations that produce false signals
Solution Approach 1:
The patent introduces compensating masses that are driven in antiparallel motion opposite to the Coriolis masses. These compensating masses generate inertial forces that counterbalance the harmful effects of rotational and linear accelerations on the Coriolis masses, thereby canceling out false signals while preserving the Coriolis force detection capability for accurate yaw rate measurement.
Solution Approach 2:
The patent creates an asymmetric mass distribution by introducing compensating masses with specific mass values and positions that differ from the Coriolis masses. This asymmetric configuration allows the system to differentiate between the symmetric Coriolis force pattern (useful signal) and the asymmetric interference patterns from rotational and linear accelerations (harmful signals), enabling selective detection.
2Measurement precision
If the sensor masses are driven at a specific frequency to detect yaw rate, then detection sensitivity is improved, but susceptibility to interference increases when rotational oscillations occur at the same frequency and in phase
Solution Approach 1:
The compensating masses are driven at the same frequency as the Coriolis masses but in antiparallel motion. This creates a counterbalancing effect where the inertial forces from rotational oscillations acting on the compensating masses oppose and cancel the forces acting on the Coriolis masses, thereby reducing susceptibility to interference while maintaining detection sensitivity at the drive frequency.
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 solution renders the yaw-rate sensor insensitive to rotational and linear accelerations, improving signal accuracy and robustness by neutralizing interference forces through equal action on both Coriolis and compensating masses via the substrate connection.
Implementation Method 1
In response to the occurrence of a rotational movement about the direction parallel to the main extension plane, are subject to a Coriolis force in a detection direction
Implementation Method 2
there are further forces to which sensors or parts thereof are subjected and which likewise are able to give rise to a signal, or which are able to falsify the signal assigned to the Coriolis force, especially inertial forces produced by linear accelerations and by rotational accelerations
Data Source
AI summary
A yaw-rate sensor, having a substrate which has a main extension plane, for detecting a yaw rate about a first direction extending either parallel to the main extension plane or perpendicular to the main extension plane. The yaw-rate sensor has a drive device, a first Coriolis mass and a second Coriolis mass, the drive device being configured to drive at least one part of the first Coriolis mass and at least one part of the second Coriolis mass in a direction parallel to a drive direction extending perpendicular to the first direction.