Steering Angle Sensing With Fault-Tolerant Absolute Angle Update

The absolute steering angle detection function is segmented into two separate relative steering angle detectors, each detecting at different phases. This segmentation allows the system to achieve absolute angle measurement through mathematical processing of multiple relative measurements, resolving the contradiction between improved measurement precision and increased device complexity.

The two relative steering angle detectors serve multiple functions: they detect relative steering angles at different phases for absolute angle calculation, and simultaneously provide redundancy for fault detection. The diagnostic unit also serves dual purposes by monitoring detector health and enabling fail-safe operation, thus addressing both measurement precision and system complexity through multi-functionality.

The system implements self-service through the diagnostic unit that automatically monitors detector health, identifies malfunctions, and switches to fail-safe operation mode. This self-diagnostic and self-adjusting capability provides reliability without requiring external redundant systems, thus improving reliability while avoiding the complexity and cost of additional redundant hardware.

The diagnostic unit performs beforehand cushioning by continuously monitoring detector status and preparing fail-safe operation modes in advance. When a malfunction occurs, the system has already established alternative calculation methods using stored data, ensuring continuous reliable operation without requiring additional redundant detectors, thereby achieving reliability without increasing device complexity.

The diagnostic unit and fail-safe operation control are merged into an integrated system that combines detection, diagnosis, and corrective action in a single control unit. This merging approach improves reliability through comprehensive fault handling while avoiding the complexity increase that would result from separate independent systems for each function.

The diagnostic unit implements feedback by continuously monitoring detector outputs, comparing expected versus actual values, and automatically adjusting operation mode based on detected anomalies. This feedback mechanism provides robust fault tolerance while maintaining relatively simple system structure, as the same control unit performs both normal operation and fault response without requiring additional dedicated hardware.