High Resolution Angular Rotation Sensor Using Dual Hall Effect Pairs
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Solution Overview
Problem
Conventional wheel speed sensors lack the precision and accuracy needed for advanced vehicle control systems, such as anti-lock braking and autonomous parking, due to limitations in detecting angular rotation with sufficient resolution.
Innovation Solution
A very high resolution sensor system comprising two pairs of magnetic sensors and a controller, which detect magnetic flux density differentials to output pulses corresponding to the degree of rotation, allowing for precise measurement of angular displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wheel speed sensors are used, then the device complexity is low, but the measurement precision of angular rotation is insufficient
Solution Approach 1:
The sensor system is divided into multiple pairs of magnetic sensors (first pair and second pair) positioned at different locations. Each pair detects magnetic flux density differentials at its specific position, and the controller compares signals from both pairs to determine angular rotation with high precision. This segmentation allows achieving high measurement precision without requiring a single complex sensor.
Solution Approach 2:
The invention transitions from single-point detection to multi-point spatial detection by positioning sensor pairs at different radial distances from the rotation axis. The controller analyzes the temporal relationship between signals from sensors at different positions to calculate angular displacement, adding a spatial dimension to the measurement approach and thereby improving precision.
2Measurement precision
If conventional single-pair magnetic sensors are used, then the device complexity is low, but the measurement precision and accuracy of angular rotation are insufficient for advanced vehicle control
Solution Approach 1:
The controller acts as an intermediary that receives magnetic flux density differential signals from multiple sensor pairs, processes these signals by comparing their temporal relationships, and outputs precise angular rotation measurements. This intermediary processing enables high-precision measurement without requiring each individual sensor to be highly complex.
Solution Approach 2:
The magnetic sensors are pre-positioned at specific radial distances from the rotation axis during system assembly. This preliminary positioning ensures that the sensors detect magnetic flux density differentials at optimal locations, enabling accurate angular rotation measurement without requiring complex real-time adjustment mechanisms.
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 enhanced precision and accuracy in detecting angular rotation, enabling improved vehicle control and position management, particularly in applications requiring fine control like anti-lock braking and autonomous parking.
Implementation Method 1
a first pair of sensors configured to detect a first magnetic flux density differential of a rotating target; a second pair of sensors configured to detect a second magnetic flux density differential of the rotating target
Data Source
AI summary
A very high resolution sensor for detecting an angular rotation of a rotating target, the sensor including a first pair of Hall effect sensors and a second pair of Hall effect sensors. A first magnetic flux density differential of the rotating target is generated from the first pair of Hall effect sensors and a second magnetic flux density differential of the rotating target is generated from the second pair of Hall effect sensors. A pulse corresponding to an amount of angular rotation of the rotating target is output based on the second magnetic flux density differential reaching the first magnetic flux density differential.