Angular Velocity Sensor Lateral Acceleration Discrimination
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Solution Overview
Problem
Existing horizontally located angular velocity sensors face difficulties in distinguishing between vibrations caused by angular velocity and translational acceleration from the lateral direction, making it challenging to accurately detect angular velocity.
Innovation Solution
The design includes a fixed portion with upper and lower vibration arms extending parallel to the support surface, where the lower vibration arm is positioned opposite to the upper arms, allowing for easy discrimination of Coriolis-based vibrations from lateral acceleration-induced vibrations, and the use of connection arms to enhance the moment applied by the Coriolis force, improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a horizontally located angular velocity sensor is used to reduce size and thickness, then compactness is improved, but the ability to distinguish between angular velocity-induced vibrations and lateral acceleration-induced vibrations deteriorates
Solution Approach 1:
The sensor divides the detection function into multiple separate vibration arms (first upper, lower, second upper, and third upper vibration arms) that can be independently driven and detected. This segmentation allows differential measurement between arms to distinguish Coriolis force effects from lateral acceleration effects, resolving the measurement precision issue while maintaining the compact horizontal structure
Solution Approach 2:
The patent combines multiple vibration arms into a single integrated sensor structure that shares common support elements and detection mechanisms. By merging the drive and detection functions across multiple arms, the sensor achieves improved angular velocity detection accuracy through differential measurement while maintaining compact dimensions
2Measurement precision
If multiple vibration arms are added to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Multiple vibration arms serve dual functions: they act as both drive elements (when energized) and detection elements (when measuring Coriolis force). This multi-functionality reduces the need for separate drive and detection components, thereby improving measurement precision without proportionally increasing device complexity
Solution Approach 2:
The sensor employs an asymmetric arrangement where the first upper vibration arm and lower vibration arm form one pair, while the second upper and third upper vibration arms form another pair with different orientations. This asymmetric configuration enables differential measurement that enhances angular velocity detection accuracy while maintaining a manageable structural complexity through systematic arrangement
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 configuration enables effective removal of lateral acceleration influence, enhances detection accuracy by increasing vibration amplitude, and simplifies the drive circuit configuration, allowing for precise angular velocity and acceleration detection.
Implementation Method 1
it is easy to discriminate the Coriolis-based vibrations from vibrations caused by acceleration applied from a lateral direction
Data Source
AI summary
An angular velocity sensor of a horizontally located type, which can easily remove the translational acceleration influence thereto from the lateral direction, is provided. It includes a fixed portion fixed to the surface of a sensor element supporting portion of a casing, an upper detection arm and a lower detection arm, each of them being connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the surface place of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion in such a manner as to form a pair of arms with the upper detection arm in between and extending in a direction parallel to the extending direction of the upper detection arm.