Driver Assistance Sensor Recalibration Using Stored Reference Values
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Solution Overview
Problem
Existing driver assistance systems face challenges in maintaining accurate sensor calibration after vehicle repairs, such as windshield replacement, leading to potential misalignment and malfunction of systems like lane-keeping and emergency brake assistants.
Innovation Solution
A method for recalibrating vehicle sensors using a reference object to store and restore calibration values, allowing for precise recalibration of sensors after installation or replacement, ensuring alignment with the vehicle axis and using distance and alignment parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the sensor is removed for repair or replacement, then the sensor can be maintained or upgraded, but the calibration data is lost and recalibration is required
Solution Approach 1:
The system performs preliminary action by storing reference calibration data in the control unit before the sensor is removed. This reference data serves as a baseline that enables rapid recalibration after repair without requiring time-consuming re-calibration procedures from scratch.
Solution Approach 2:
The invention creates a copy of the calibration data by storing reference calibration values in the control unit's memory. This copied reference data can be quickly reapplied to the sensor after repair, avoiding the need to perform lengthy recalibration procedures while maintaining calibration accuracy.
2Measurement precision
If traditional recalibration procedures are used after sensor replacement, then the sensor can be recalibrated, but the process is time-consuming and complex
Solution Approach 1:
Reference calibration data is prepared and stored in advance in the control unit before any sensor removal occurs. When recalibration is needed, this pre-prepared reference data is simply reapplied to the sensor, dramatically reducing calibration time while maintaining the precision that would otherwise require lengthy traditional recalibration procedures.
3Reliability
If the reference calibration value is stored in the sensor itself, then the calibration is preserved, but the control unit cannot perform centralized calibration management
Solution Approach 1:
The invention extracts the calibration data storage function from the sensor itself and places it in the control unit's memory. This centralizes calibration management in the control unit, allowing it to store, manage, and reaply reference calibration values as needed, while the sensor remains a simpler detection device without embedded storage requirements.
Data Source
AI summary
A method for calibrating a sensor for a driver assistance system of a vehicle. The method includes a step of outputting of a calibration signal by the sensor of the vehicle in the stationary operating state when a reference object has been placed in a position in front of the vehicle, in the step of outputting, a reference calibration value being stored, which corresponds to a calibrated state of the sensor. The method further includes a step of executing a calibration of the sensor, and/or of a further sensor in the vehicle in the stationary operating state, the calibration of the sensor and/or of a further sensor taking place using a knowledge of the position of the reference object and of the reference calibration value.