In-Vehicle Sensor Calibration Split for Replacement Accuracy
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Solution Overview
Problem
In-vehicle sensor systems face precision issues when the surrounding sensor is replaced, as existing technologies rely on pre-measured adjustment values that may not account for changes in the detector's position and posture relative to the casing and vehicle body, leading to decreased accuracy of detection data.
Innovation Solution
An in-vehicle sensor system with a surrounding sensor, a casing, and a corrector that uses stored data to correct detection data based on the actual deviations of the detector and casing from their normal positions and postures, ensuring equivalent precision before and after sensor replacement without requiring new measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surrounding sensor is replaced after vehicle production, then the sensor can be restored to functionality, but the precision of detection data decreases because the detector's position and posture relative to the casing may have changed
Solution Approach 1:
The patent segments the calibration data into two distinct components: first calibration data stored in the sensor device (detector position/posture relative to casing) and second calibration data stored in the external storage device (casing position/posture relative to vehicle body). This segmentation allows the first calibration data to be updated with each sensor replacement while the second calibration data remains constant, thereby maintaining detection precision without requiring full recalibration.
Solution Approach 2:
The patent performs preliminary calibration during sensor manufacturing by measuring and storing the detector's position and posture relative to the casing in the sensor device's storage. This preliminary action ensures that when the sensor is replaced, the new sensor's calibration data is already available, eliminating the need for time-consuming on-vehicle recalibration and maintaining precision from the start.
2Measurement precision
If sensor calibration is performed at vehicle production for each vehicle, then the detection precision is optimized for that specific vehicle, but the process becomes time-consuming and complex when sensors are replaced
Solution Approach 1:
The patent divides calibration data into two segments: sensor-specific calibration data (detector to casing) stored in the sensor device, and vehicle-specific calibration data (casing to vehicle body) stored externally. This segmentation allows the sensor-specific portion to be pre-calibrated during manufacturing and replaced with the sensor, while the vehicle-specific portion remains unchanged, eliminating the need for time-consuming on-vehicle recalibration.
Solution Approach 2:
The patent performs the sensor-to-casing calibration in advance during sensor manufacturing and stores it in the sensor's internal storage. This preliminary calibration action means that when the sensor is replaced, the calibration data is already prepared and transferred, eliminating the need for time-consuming recalibration procedures after sensor replacement.
3Device complexity
If the detector's position and posture relative to the casing are assumed to remain constant after sensor replacement, then the calibration process is simplified, but the precision of detection data deteriorates
Solution Approach 1:
The patent segments calibration data into sensor-specific data (detector position/posture relative to casing) stored in the sensor device and vehicle-specific data (casing position/posture relative to vehicle body) stored externally. This segmentation allows the system to acknowledge and compensate for detector-to-casing variations with each sensor replacement while maintaining the assumption that casing-to-vehicle-body relationships remain constant, thus balancing complexity and precision.
Solution Approach 2:
The patent applies different calibration approaches to different parts of the system: the detector-to-casing relationship is calibrated individually for each sensor unit during manufacturing, while the casing-to-vehicle-body relationship is calibrated once at vehicle production. This local quality approach allows precision to be maintained at the sensor level without requiring complex recalibration of the entire system.
Data Source
AI summary
Provided is an in-vehicle sensor system capable of maintaining an equivalent level of precision (accuracy) of data to be output before and after replacement of a surrounding sensor. An in-vehicle sensor system (1) includes: a surrounding sensor including: a casing (11) removably mounted to a bracket (BC) fixed to a vehicle body (B) of a vehicle; a detector which is supported by the casing (11), and is configured to output detection data representing a situation within a predetermined detection range; and a first storage having stored therein first data corresponding to a deviation amount of an actual position and an actual posture of the detector with respect to the casing (11) from a predetermined normal design position and a predetermined normal design posture of the detector with respect to the casing (11); a second storage which is provided separately from the surrounding sensor and is fixed to the vehicle body (B), and is configured to store second data corresponding to a deviation amount of an actual position and an actual posture of the casing (11) with respect to the vehicle body (B) from a predetermined normal design position and a predetermined normal design posture of the casing (11) with respect to the vehicle body (B); and a corrector which is provided on an inner side or an outer side of the casing (11), and is configured to correct, when the second data is stored in the second storage, the detection data output from the detector based on the first data and the second data, to thereby generate and output data expected to be output by the detector when it is assumed that the detector is fixed at the normal design position and in the normal design posture.