Inertial Sensor Module Segmentation for Yaw Rate Accuracy
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Solution Overview
Problem
Existing inertial sensor modules, particularly those with three-axis silicon MEMS sensors, fail to meet the demand for high accuracy in detecting specific one-axis angular velocities, leading to inaccuracies in calculating yaw angles in vehicle posture control systems.
Innovation Solution
An inertial sensor module comprising a first inertial sensor with higher detection accuracy for a specific axis and a second inertial sensor with lower accuracy for other axes, where an operation circuit selects and outputs either the first or second output signal based on the detection signals from both sensors, depending on the range of motion or temperature, to ensure high accuracy and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-axis silicon MEMS sensor is mounted on the inertial sensor module, then the device complexity is reduced and cost is lowered, but the detection accuracy for specific one-axis angular velocity deteriorates
Solution Approach 1:
The inertial sensor module segments the sensor functions by incorporating a three-axis angular velocity sensor for general detection and a dedicated one-axis angular velocity sensor for high-precision yaw rate detection. This segmentation allows each sensor to be optimized for its specific function, resolving the contradiction between device simplicity and measurement precision for critical axes.
Solution Approach 2:
The patent applies local quality by providing enhanced detection capability specifically for the yaw rate axis (first axis) while using standard three-axis sensors for other axes. The operation circuit selectively uses the high-precision one-axis sensor output for yaw rate calculations, ensuring high measurement precision where needed without unnecessarily increasing device complexity across all axes.
2Ease of manufacture
If a three-axis silicon MEMS sensor is used for all axes, then the ease of manufacture is improved, but the detection accuracy for critical axes deteriorates
Solution Approach 1:
The manufacturing approach is segmented by using a standard three-axis silicon MEMS sensor for the majority of sensing requirements while adding a specialized one-axis high-precision sensor only for the critical yaw rate axis. This segmentation maintains ease of manufacture for the bulk of the system while achieving high precision where required.
Solution Approach 2:
The patent implements local quality in manufacturing by applying enhanced precision engineering only to the one-axis angular velocity sensor for yaw rate detection, while using cost-effective silicon MEMS technology for the three-axis sensor. The operation circuit ensures that the high-precision local sensor is utilized for yaw rate measurements, achieving high detection accuracy for critical axes without compromising ease of manufacture overall.
3Measurement precision
If high-precision sensors are used for all three axes, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies local quality by providing high-precision detection capability specifically for the yaw rate axis where it is most critical for vehicle posture control, while using standard precision sensors for the roll and pitch axes. The operation circuit selectively processes the high-precision one-axis sensor output for yaw rate calculations, achieving high measurement precision for critical measurements without unnecessarily increasing device complexity for all axes.
Data Source
AI summary
An inertial sensor module includes: a first inertial sensor having a first axis as a detection axis; and a second inertial sensor having the first axis as a detection axis, in which detection accuracy of the first inertial sensor is higher than detection accuracy of the second inertial sensor, and the operation circuit receives a detection signal of the first axis output from the first inertial sensor and a detection signal of the first axis output from the second inertial sensor, and selects and outputs either a first output signal based on the detection signal of the first axis output from the first inertial sensor or a second output signal based on the detection signal of the first axis output from the second inertial sensor.