Steering Angle Sensor Calibration During Software Updates
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Solution Overview
Problem
Current steering angle sensor systems in motorized transportation vehicles require mechanical recalibration after every software update, which is complex and can lead to data corruption, preventing automatic software updates during customer appointments.
Innovation Solution
A method that involves reading and saving present position data and calibration values, monitoring the rotor position during a software update, and writing back these values if no movement is detected, allowing for software updates without mechanical recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical recalibration is performed after every software update, then data integrity is maintained, but device complexity and time loss increase
Solution Approach 1:
The patent applies preliminary action by saving the calibration values before the software update is performed. This allows the calibration data to be preserved and restored after the update, avoiding the need for mechanical recalibration while maintaining data integrity. The calibration values are stored in a memory location that persists across software updates.
Solution Approach 2:
The patent uses copying by creating a backup copy of the calibration values before software update. Instead of performing mechanical recalibration, the system copies the existing calibration data, performs the software update, then restores the calibration by copying the saved values back. This eliminates the complex mechanical calibration process while preserving data integrity.
2Measurement precision
If mechanical recalibration is performed after every software update, then steering angle accuracy is maintained, but loss of time increases
Solution Approach 1:
The system performs preliminary action by saving calibration values before software update and automatically restoring them after. This eliminates the time-consuming mechanical recalibration process while maintaining steering angle accuracy, reducing calibration time from minutes to near-zero.
Solution Approach 2:
The patent uses copying to preserve calibration data through software updates. By copying calibration values to a persistent storage location before update and copying them back after update, the system maintains steering angle accuracy without requiring time-consuming mechanical recalibration procedures.
3Productivity
If automatic software updates are performed, then productivity increases, but data corruption risk increases
Solution Approach 1:
The patent applies preliminary action by saving calibration values to persistent storage before the software update process begins. This preparation step ensures that if the update completes successfully, the calibration data can be restored automatically, enabling productive automatic updates while protecting against data corruption.
Solution Approach 2:
The system implements beforehand cushioning by creating a backup of calibration data before software updates. This protective measure cushions against potential data corruption during updates, allowing automatic updates to proceed productively while maintaining data integrity through the pre-prepared backup values.
4Reliability
If rotor position monitoring is implemented during software update, then data integrity is protected, but device complexity increases
Solution Approach 1:
The patent uses feedback by continuously monitoring the rotor position during the software update process. The monitoring system provides feedback about rotor movement to the control unit, which uses this information to determine whether to proceed with or abort the update. This simple feedback mechanism protects data integrity without requiring complex monitoring systems.
Data Source
AI summary
A method and equipment for calibrating the steering angle sensor system of an electric steering system of a transportation vehicle during a software update, wherein the steering angle sensor system has a rotor position sensor for determining the rotor position of the electric motor of the electric steering system and the steering angle is derived from the rotor position. The method includes starting the software update, reading in and saving the present position data of the electric motor of the steering system, reading in and saving the memory values of the present calibration of the steering angle sensor system, cyclically monitoring the rotor position of the electric motor using the rotor position sensor, performing the software update, terminating the software update, and writing back the memory values of the calibration and releasing the software update.