Motor Sinusoidal Stimulus Diagnostics for Harness Degradation
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Solution Overview
Problem
High power electrical harnesses and connectors in vehicles degrade over time, leading to voltage drops and potential loss of function in electric power steering (EPS) and advanced driver-assistance systems (ADAS) due to increased resistance, causing steering assist failures and loss of angle control.
Innovation Solution
A method and system for diagnosing degraded input power supply conditions by generating a sinusoidal stimulus signal and measuring responses to determine harness resistance values, allowing for proactive action such as output power limiting and driver notifications to prevent system failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power electrical harness and connector are used to supply electrical power, then sufficient power delivery is achieved, but resistance increases over time causing voltage drop and potential loss of function
Solution Approach 1:
The system performs preliminary diagnostic testing by applying a sinusoidal stimulus signal to the motor and measuring the response to detect harness degradation before it causes complete system failure. This allows proactive identification of increased resistance in the electrical connection, enabling preventive maintenance or system adjustment before voltage drops become severe enough to cause loss of function.
2Measurement precision
If stimulus signal magnitude is increased to detect degradation, then measurement sensitivity improves, but voltage drop and potential system shutdown risk increases
Solution Approach 1:
The system applies a sinusoidal stimulus signal at a reduced magnitude specifically for diagnostic purposes, rather than using full operational power levels. This partial action approach allows sufficient sensitivity to detect harness degradation and measure resistance changes while maintaining voltage levels high enough to prevent system shutdown, thus avoiding the harmful effects of excessive stimulus magnitude.
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 solution effectively detects and mitigates the effects of harness degradation, preventing voltage drops and maintaining system functionality by limiting output power and providing driver warnings, thus reducing the risk of complete system failure.
Implementation Method 1
A motor of a steering system may be subjected to a sinusoidal stimulus signal, which may cause the motor to produce a response
Data Source
AI summary
Technical solutions are described for diagnosing an input power supply providing power to a motor. A method includes: generating a sinusoidal stimulus signal; applying, using the input power supply, the sinusoidal stimulus signal to the motor; measuring a response to the sinusoidal stimulus signal; determining a degraded condition of the input power supply based on the response to the sinusoidal stimulus signal; and performing an action in response to determining the degraded condition of the input power supply.