Steering Wheel and Road Wheel Resynchronization Without Absolute Sensors
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Solution Overview
Problem
The synchronization between the rotatory position of a steering wheel and the angular position of a road wheel is often lost, leading to unreliable vehicle steering, necessitating a simple and reliable method for re-synchronization.
Innovation Solution
A method involving incremental position sensors to synchronize the steering wheel and road wheel positions by moving them into known end stop positions and using incremental sensor detection to adjust to neutral positions, eliminating the need for redundant absolute position sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absolute position sensors are used to ensure precise steering wheel and road wheel positioning, then measurement precision is improved, but device complexity increases due to redundant sensors
Solution Approach 1:
The patent extracts and eliminates the redundant absolute position sensors from the system, retaining only the incremental position sensors while adding a synchronization method that compensates for the removed components, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The patent creates a virtual copy of the absolute position information by using incremental position sensors to detect end stop positions and calculating neutral positions through synchronization algorithms, effectively replicating the function of absolute sensors without the hardware redundancy
2Reliability
If synchronization is lost between steering wheel and road wheel positions, then reliability deteriorates, but the system lacks a simple recovery method
Solution Approach 1:
The patent implements preliminary action by pre-defining end stop positions and using them as reference points for synchronization recovery, allowing the system to automatically re-synchronize after loss of synchronization without complex intervention procedures
Solution Approach 2:
The synchronization method enables the system to self-correct by using its own incremental position sensors to detect end stop positions and automatically calculate neutral positions, making the system self-sufficient for recovery without external intervention or additional complex mechanisms
Data Source
AI summary
According to an embodiment, it is a method for synchronizing the rotatory position (β) of the steering wheel to the angular position (α) of the road wheel comprising, causing at least one of a steering wheel to move into a steering wheel end stop position, wherein a rotatory position (β) of the steering wheel end stop position is known, and causing a road wheel to move into a road wheel end stop position, wherein an angular position (α) of the road wheel end stop position is known; causing the steering wheel to move into a neutral steering wheel position based on the rotatory position (β) of the steering wheel end stop position using a first incremental position sensor, and causing the road wheel to move into a neutral road wheel position based on the angular position (α) of the road wheel end stop position using a second incremental position sensor.