Speed Pick-Up Ring Convex Base Notch Design
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Solution Overview
Problem
Variable reluctance sensors used in applications like vehicle speed measurement experience output fluctuations due to noise, which affect accuracy and need to be minimized or eliminated.
Innovation Solution
A speed pick-up ring with a main body featuring a plurality of targets and notches, where each notch has a convex base wall and concave sidewalls, is integrated into a fluid device housing, providing consistent air gaps to stabilize the voltage output of the variable reluctance speed sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a variable reluctance sensor is used to measure speed, then speed measurement capability is provided, but output fluctuations occur due to noise
Solution Approach 1:
The pick-up ring features localized geometric variations including convex portions on base walls and concave portions on sidewalls. These local geometric modifications create consistent air gaps at specific locations (targets and notches) while maintaining overall sensor functionality, thereby reducing output fluctuations without compromising speed measurement capability
Solution Approach 2:
The invention modifies the air gap parameter by creating convex portions on base walls and concave portions on sidewalls of the pick-up ring. These geometric changes ensure consistent air gaps when the sensor senses targets and notches, directly addressing the output stability issue while preserving measurement accuracy
2Manufacturing precision
If the pick-up ring has complex notch geometry with convex base walls and concave sidewalls, then air gap consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The pick-up ring employs curved geometric features including convex portions on base walls and concave portions on sidewalls. These curved surfaces are machined using standard CNC machining operations with appropriate cutting tools, achieving consistent air gaps while remaining manufacturable with conventional equipment
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 speed pick-up ring minimizes or eliminates voltage output fluctuations, ensuring accurate speed determination by maintaining consistent air gaps when sensing targets and notches, thereby enhancing the reliability of speed measurements.
Implementation Method 1
Variable reluctance sensors are used in various applications. The output from these variable reluctance sensors is used to determine, among other things, the speed of a vehicle or a component on that vehicle.
Data Source
AI summary
A speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall and an oppositely disposed second sidewall. The base wall includes a convex portion. A fluid device includes a housing and a variable reluctance speed sensor engaged to the housing. The fluid device further includes a speed pick-up ring disposed within the housing. The speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall that is generally concave and an oppositely disposed second sidewall that is generally concave. The base wall includes a convex portion.