Power Steering Friction Detection via Acoustic Signals
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Solution Overview
Problem
Existing power steering systems fail to detect increased friction in the steering gear separately from other influences, leading to unnecessary replacement of functional components.
Innovation Solution
An electrically assisted power steering system with sensors that detect acoustic or acceleration signals during steering angle changes, comparing these signals to a threshold value to identify excessive friction in the steering gear, and alerting the driver through a control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing friction detection methods are used, then friction in the steering system can be detected, but the friction cannot be determined separately from other influences such as pivot bearings and shock absorbers
Solution Approach 1:
The patent segments the friction detection by focusing specifically on the steering gear component during steering angle changes. By measuring friction only during active steering operations rather than during vehicle motion in general, the system isolates the steering gear friction from other components like pivot bearings and shock absorbers, enabling component-specific diagnostics.
Solution Approach 2:
The patent employs dynamic measurement by detecting friction during actual steering angle changes rather than static conditions. The control unit monitors the relationship between steering angle changes and friction forces in real-time, allowing differentiation of steering gear friction from other system components that behave differently during dynamic steering operations.
2Reliability
If the entire steering system is replaced due to detected increased friction, then the friction problem is resolved, but functional components are unnecessarily discarded
Solution Approach 1:
The patent enables component-level diagnostics by specifically identifying friction increases in the steering gear separate from other steering system components. This segmentation allows the control unit to determine whether the steering gear itself requires replacement or if other components are responsible, preventing unnecessary replacement of functional steering gears.
Solution Approach 2:
The control unit acts as an intermediary that processes friction measurements and determines the specific source of friction increases. By analyzing the relationship between steering angle changes and friction forces, the control unit mediates between the raw sensor data and the replacement decision, enabling accurate identification of the faulty component before any replacement action is taken.
3Device complexity
If friction is detected only after electrical assistance fails, then the detection method is simple, but prompt warning of the driver is not provided
Solution Approach 1:
The patent implements preliminary detection by continuously monitoring friction forces during steering operations and comparing them against threshold values. The control unit detects friction increases before the electrical assistance system completely fails, providing advance warning to the driver while the system is still functional. This preliminary action enables preventive maintenance and safe driver response before catastrophic failure occurs.
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
Accurately detects increased friction in the steering gear, preventing the unnecessary replacement of functional components and ensuring driver safety by providing timely warnings.
Implementation Method 1
the sensor is designed in such a way that it detects an acoustic signal (air-borne noise) or an acceleration signal (vibration, structure-borne noise) of the steering system during a change in the steering angle
Implementation Method 2
the sensor is designed in such a way that it detects an acoustic signal (air-borne noise) or an acceleration signal (vibration, structure-borne noise) of the steering system
Data Source
AI summary
A power steering system including a sensor arranged or located in the steering system. The sensor detects an acoustic vibration or an acceleration signal in the steering system during a change in the steering angle and generates a sensor signal representing the vibration or the acceleration signal. A control unit receives the sensor signal and compares the sensor signal with a threshold value to detect a fault state; for example when the sensor signal is larger than the threshold value.