Ball Joint Friction Sensing for Autonomous Steering Wear Detection
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Solution Overview
Problem
Autonomous vehicles lack the ability to detect worn ball joints in power steering systems, as they do not receive haptic feedback, which is typically sensed by human operators through vibrations and increased steering effort.
Innovation Solution
A ball joint assembly with a sensor and computer system that detects increased friction between the ball and cup due to worn bushings by monitoring the steering gear output force and determining when it exceeds a predetermined threshold, allowing for autonomous detection and notification of the need for replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a ball joint assembly is used in a power steering system, then steering assistance is provided to the operator, but the system cannot autonomously detect when the ball joint requires replacement
Solution Approach 1:
A sensor is introduced as an intermediary component between the ball joint assembly and the autonomous vehicle's computer system. The sensor detects friction changes in the ball joint assembly and converts them into electrical signals that the computer can process, enabling autonomous detection without requiring human haptic feedback
Solution Approach 2:
The patent replaces the mechanical haptic feedback system (which requires human operator sensation) with an electronic sensing system. The sensor and computer system electronically detect friction changes and communicate wear conditions, substituting the mechanical-human feedback loop with an electronic automation loop
2Reliability
If haptic feedback is used to indicate worn ball joint, then the human operator can sense the wear through vibrations and steering effort, but autonomous vehicles cannot perceive these physical sensations
Solution Approach 1:
The ball joint assembly essentially monitors its own condition through the sensor that detects friction changes. The system is self-diagnosing by measuring its own operational parameters (friction) and communicating wear status to the vehicle's computer, eliminating the need for external human operator assessment
3Extent of automation
If a sensor is added to detect friction in the ball joint assembly, then autonomous detection is enabled, but the device complexity increases
Solution Approach 1:
The sensor serves multiple functions: it detects friction changes, converts mechanical friction into electrical signals, and provides data to the vehicle's existing computer system. By integrating with the vehicle's existing computational infrastructure, the sensor leverages existing multi-functional systems rather than creating entirely new separate systems
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
Enables autonomous vehicles to identify and report the need for ball joint replacement without operator input, ensuring timely maintenance and preventing potential steering issues.
Implementation Method 1
a sensor programmed to detect friction between the cup and the ball from the protrusion engaging the recess
Data Source
AI summary
A ball joint assembly includes a ball including an outer surface and a recess in the outer surface, a cup including an inner surface and a protrusion on the inner surface, and a sensor programmed to detect friction between the cup and the ball from the protrusion engaging the recess.