Yaw Mounting Angle Calculation for Inclined Acceleration Sensors
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Solution Overview
Problem
Existing acceleration sensor mounting methods experience decreased calculation accuracy of yaw mounting angles when the vehicle is inclined, particularly due to the difficulty in maintaining sensor axes parallel to the vehicle plane and detecting misalignment caused by inclination.
Innovation Solution
An acceleration detection device with a first and second detection axis orthogonal to each other, mounted such that the yaw mounting angle between a vehicle reference axis and a virtual line is ±15 degrees or less, using an acquisition section to gather accelerations and a mounting angle calculation section to derive the yaw mounting angle from specific angle calculation formulas, assuming acceleration in the vehicle front-rear direction and no acceleration in the width direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration sensor is mounted on an inclined vehicle, then the sensor can be installed, but the calculation accuracy of yaw mounting angles decreases
Solution Approach 1:
The patent changes the calculation parameters by introducing multiple acceleration sensors arranged in specific orientations (including z-axis sensors) to detect accelerations in multiple directions. This allows the system to calculate yaw mounting angles using a more robust formula that accounts for inclination effects, thereby maintaining measurement precision even when mounted on inclined surfaces
Solution Approach 2:
The patent adds the z-axis dimension to the sensor arrangement, transforming the traditional two-axis (x-y) measurement system into a three-axis system. This dimensional expansion enables the detection of vertical acceleration components caused by inclination, allowing the calculation algorithm to compensate for mounting angle errors and maintain accurate yaw angle measurements
2Ease of operation
If the sensor axes are inclined relative to the vehicle plane, then mounting flexibility is improved, but the accuracy of vehicle orientation detection deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the calculated yaw mounting angle is used to correct the acceleration data. The system continuously monitors the relationship between detected accelerations and calculated orientations, using the yaw angle information to compensate for mounting misalignments, thereby maintaining accurate vehicle orientation detection even with flexible mounting
Solution Approach 2:
The patent introduces an intermediate calculation step that uses the yaw mounting angle as a mediator between the raw acceleration sensor data and the final vehicle orientation determination. This intermediate parameter allows the system to decouple the mounting orientation from the measurement accuracy, enabling flexible mounting while maintaining precise orientation detection through mathematical correction
Data Source
AI summary
An acceleration detection device includes an acceleration sensor that has a first detection axis and a second detection axis such that a yaw mounting angle between a vehicle reference axis and a virtual line is ±15 degrees or less, an acquisition section acquiring an acceleration in a direction of the first detection axis and an acceleration in a direction of the second detection axis, and a mounting angle calculation section calculating the yaw mounting angle from an angle calculation formula and the acceleration in the direction of the first detection axis and the acceleration in the direction of the second detection axis.