Steering Sensor Calibration Using Torque Correlation During Operation
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Solution Overview
Problem
Existing methods for calibrating and initializing steering sensors in vehicles are inadequate for ensuring precise calibration and automation, particularly in steer-by-wire systems, leading to potential operational errors due to aging and wear.
Innovation Solution
A method involving the determination of torque parameters at multiple deflection positions of the steering handle, comparison with reference parameters, and use of Fourier transforms or cross-correlation to calibrate and initialize the steering sensor, utilizing a computing unit to automate the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual calibration methods are used during manufacture or in workshops, then calibration can be performed with special tools, but simple recalibration due to aging and wear as well as automation cannot be achieved
Solution Approach 1:
The calibration method enables the steering sensor to calibrate itself automatically during vehicle operation without requiring external tools or manual intervention. The control unit automatically determines torque parameters at multiple deflection positions, compares them with reference parameters, and adjusts the steering sensor calibration accordingly, making the system self-servicing
Solution Approach 2:
The system performs calibration actions proactively during normal operation rather than waiting for manual intervention. By continuously monitoring torque parameters and comparing them with reference values, the system automatically detects drift due to aging and wear and performs recalibration before significant errors accumulate
2Measurement precision
If torque parameters are determined at multiple deflection positions and compared with reference parameters, then calibration precision is improved, but the complexity of the calibration process increases
Solution Approach 1:
The patent replaces manual mechanical calibration procedures with an automated electronic system. The control unit automatically determines torque parameters at multiple deflection positions using the torque sensor, performs digital comparison with reference parameters stored in memory, and electronically adjusts the steering sensor calibration, eliminating the need for physical leveling tools and manual procedures
Solution Approach 2:
The system varies the deflection position parameter across multiple measurement points during calibration. By determining torque parameters at different steering angles and comparing these varying parameters with reference values, the system achieves comprehensive calibration across the entire operating range, improving precision while the automated process manages the complexity
3Ease of operation
If manual calibration using special tools is performed, then initial calibration can be achieved, but recalibration due to aging and wear cannot be simply performed
Solution Approach 1:
The system performs automatic recalibration during normal vehicle operation without requiring the vehicle to be in a workshop or special tools. The control unit continuously monitors torque parameters and automatically adjusts calibration to compensate for aging and wear effects, making recalibration as simple as normal vehicle operation while maintaining high reliability
Solution Approach 2:
The calibration system operates continuously during vehicle use rather than requiring periodic manual intervention. By continuously determining torque parameters at multiple deflection positions and comparing them with reference parameters, the system maintains accurate calibration throughout the vehicle's operational life, addressing aging and wear in real-time
Data Source
AI summary
A method is for calibrating and/or initializing a steering sensor of a steering system, in particular during operation of the steering system in a vehicle. The steering system includes a steering handle and a torque sensor associated with the steering handle. The steering sensor is configured to detect a deflection position of the steering handle. A torque parameter is determined by determining a torque for each of a plurality of different deflection positions of the steering handle, and is compared with a reference parameter in order to calibrate and/or initialize the steering sensor.