Power Steering Freezing Detection via Motor Speed Patterns
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Solution Overview
Problem
Power steering systems face impairment due to external influences such as freezing, which existing technologies fail to detect early and effectively mitigate, leading to potential vehicle control issues.
Innovation Solution
A method that evaluates speed patterns and friction coefficients to detect freezing in the power steering system, applying an oscillating engine torque to prevent complete freezing and provide haptic feedback to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water drain valve is arranged in the steering housing to drain water, then the steering system is protected from freezing, but the detection of freezing impairment is delayed and cannot identify the onset of freezing early enough
Solution Approach 1:
The control unit continuously monitors speed patterns and friction coefficients to detect freezing impairment at its onset, before actual freezing occurs. This preliminary detection allows early intervention to prevent the harmful effect rather than reacting after damage has occurred.
Solution Approach 2:
The system uses feedback from speed pattern evaluation and friction coefficient measurement to continuously assess the steering system's state. When freezing impairment is detected, the control unit adjusts engine torque accordingly, creating a closed-loop control system that responds to actual system conditions.
2Adaptability or versatility
If the steering system is exposed to outdoor environmental conditions, then the power steering can be used outdoors, but freezing impairment occurs due to water penetration
Solution Approach 1:
The steering system uses its own operational parameters (speed patterns, friction coefficients) as diagnostic signals to detect freezing impairment. The system monitors itself during normal operation without requiring separate sensors or external monitoring systems.
Solution Approach 2:
The patent replaces mechanical water drainage systems with a control-based detection and prevention system. Instead of relying solely on physical water removal mechanisms, the system uses electronic monitoring of speed patterns and friction to detect and prevent freezing through controlled engine torque adjustment.
3Reliability
If the engine torque is continuously adjusted to prevent freezing, then the steering remains operational, but the system complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the motor for power steering operation, monitors speed patterns for freezing detection, measures friction coefficients, and adjusts engine torque to prevent freezing. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The system uses the motor's own speed patterns and the steering system's friction characteristics as diagnostic signals for freezing detection. The control unit leverages existing operational data rather than requiring separate sensor systems, simplifying the overall architecture.
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
Early detection and prevention of freezing improve vehicle controllability by eliminating stick-slip effects and warning the driver through oscillating engine torque, ensuring the power steering system remains operational.
Implementation Method 1
a stick-slip effect being detected from the comparison of the desired variable for the electric motor and the manipulated variable of the mechanical system
Implementation Method 2
an oscillating loading of the power steering system by the motor, which prevents further freezing
Data Source
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AI summary
The invention relates to a method for operating a power steering (10) and to such a power steering (10). In the method according to the invention, a manual torque (24) given by a driver is superimposed on a motor torque (26) applied by a motor (16) in a superimposing unit (14). According to the invention, an interference with the power steering (10) can be recognized by means of evaluating speed samples of the motor (16).