Inertial Sensor Calibration via Ceramic Base Alignment
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Solution Overview
Problem
Current inertial sensor systems require time-consuming and costly recalibration due to insufficient alignment tolerances, especially in automotive applications for automated driving level 5, as existing calibration devices can only measure individual modules or small groups, limiting their installation space and precision.
Innovation Solution
A novel calibration method using a ceramic housing with a base device that positions the inertial sensor component with high accuracy through a mechanical fixing mechanism, allowing for precise alignment of the sensor housing relative to the base device, minimizing subsequent adjustments and enabling tolerances as low as 1.5° rotation about the Z-axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If calibration is performed after sensors are soldered and installed, then installation tolerance requirements are reduced, but alignment precision and measurement accuracy deteriorate
Solution Approach 1:
The patent applies preliminary action by performing calibration before the sensors are soldered and installed in the final device. The sensor modules are calibrated individually while still mounted on the circuit board but before final assembly, allowing precise measurement and adjustment without the constraints of installed positioning. This resolves the contradiction by enabling high-precision calibration to be performed early in the manufacturing process when access and measurement capability are optimal.
2Device complexity
If conventional calibration devices are used to measure individual modules, then device complexity is reduced, but manufacturing precision and alignment tolerance deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the calibration process into individual sensor module measurements rather than requiring measurement of the entire assembled system. Each sensor module on the circuit board can be calibrated independently using a simple calibration device, eliminating the need for complex measurement systems while achieving precise alignment tolerance through individual adjustment of each module's offset values.
3Productivity
If calibration is performed at the manufacturer level with tight tolerances, then subsequent adjustment time is reduced, but calibration device precision requirements increase
Solution Approach 1:
The patent applies self-service by utilizing the circuit board itself as the measurement reference frame during calibration. The calibration device measures sensor offsets relative to the board's coordinate system, and the board's existing mechanical structures serve as the reference, eliminating the need for external high-precision positioning equipment. This enables manufacturer-level calibration with tight tolerances while keeping the calibration device relatively simple.
Data Source
AI summary
A method for adjusting an inertial sensor component using a calibration device. The calibration device includes a base device or the base device is connected to the calibration device. The method includes: in a first step for adjusting the inertial sensor component, its housing is positioned and/or aligned relative to the base device that is arranged in the calibration device and connected thereto, in a second step following the first step, the base device and the inertial sensor component are adjusted and/or calibrated using the calibration device by applying a defined acceleration in at least one spatial direction and/or a defined rotation rate in at least one spatial direction.