Multiturn Steering Angle Sensor Using Dual Vernier Signal Fusion
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Solution Overview
Problem
Existing steering systems face challenges in accurately determining absolute steering angles due to the tradeoff between torque measurement accuracy and robustness in inductive torque sensing, particularly when using inductive and magnetic angle signals with non-integer periodicity ratios, leading to increased error tolerance and reduced accuracy.
Innovation Solution
A system that combines inductive torque sensing with a Vernier algorithm to derive a relative angle, followed by a second Vernier algorithm using magnetic gear wheel angles, optimizing torque measurement accuracy and error tolerance by leveraging unique rotational relationships between inductive angle signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive torque sensing with non-integer periodicity ratios is used, then torque measurement accuracy is improved, but error tolerance increases and measurement reliability deteriorates
Solution Approach 1:
The patent combines inductive angle sensing and magnetic angle sensing into a unified steering angle detection system. The inductive sensing provides high-resolution relative angle changes, while the magnetic sensing provides absolute position reference, merging both approaches to achieve accurate multi-turn absolute steering angle measurement without the errors associated with non-integer periodicity ratios
Solution Approach 2:
The patent introduces a Vernier algorithm as an intermediary processing method that combines the inductive angle signal and magnetic angle signal. This algorithm acts as a mediator to reconcile the different measurement systems, converting relative inductive measurements into accurate absolute multi-turn steering angles while maintaining error tolerance
2Measurement precision
If inductive angle signals with non-integer periodicity ratios are used, then relative angle measurement precision is improved, but absolute angle determination robustness deteriorates
Solution Approach 1:
The patent segments the angle measurement into two distinct components: relative angle measurement using inductive sensing for high precision, and absolute position reference using magnetic sensing for robustness. By dividing the measurement function into these segments, each component can be optimized for its specific purpose while working together to provide accurate multi-turn absolute steering angle
Solution Approach 2:
The Vernier algorithm serves as an intermediary that processes both inductive and magnetic angle signals separately and combines them mathematically. This intermediary approach allows the system to maintain the high precision of inductive relative angle measurement while using the magnetic signal as a reference to determine absolute position robustly across multiple turns
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides precise multi-turn absolute steering angle detection, enhancing the accuracy and robustness of steering angle sensing in vehicles, suitable for autonomous and semi-autonomous driving systems.
Implementation Method 1
inductive angle signals
Implementation Method 2
magnetic angle signal
Data Source
AI summary
A system for controlling a steering system of a vehicle includes sensors configured to sense a plurality of values corresponding to operation of the steering system, and a controller configured to receive the sensed plurality of values, the sensed plurality of values including inductive angle signals and a magnetic angle signal, based on the inductive angle signals, obtain a relative angle of a steering shaft using a first Vernier algorithm, based on the relative angle obtained by the first Vernier algorithm and the magnetic angle signal, obtain an absolute angle of the steering shaft using a second Vernier algorithm, and control the steering system based on the absolute angle obtained using the second Vernier algorithm.