Optical Fiber Cable Sensing for Vehicle Conductor Overheating
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Solution Overview
Problem
The increasing power requirements and electrification of motor vehicle systems lead to significant ohmic losses and heating in cables, particularly at bends and cross-sectional changes, necessitating more precise cable dimensioning to prevent overheating.
Innovation Solution
An optical fiber is integrated into the insulation of motor vehicle electrical cables to measure conductor temperature using reflectometry, allowing for real-time temperature profiling and control of power flow to prevent overheating, enabling smaller conductor cross-sections and more efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable dimensions are increased to prevent overheating, then reliability is improved, but device complexity and material usage increase
Solution Approach 1:
The patent applies preliminary action by integrating temperature sensors and monitoring systems into the cable structure before operation. This allows real-time temperature measurement and predictive thermal management, enabling the system to take preventive measures before overheating occurs rather than relying on oversized cables as a passive safety margin.
Solution Approach 2:
The patent replaces the mechanical approach of using larger cable cross-sections to dissipate heat with an optical/electronic monitoring system. Instead of increasing physical dimensions to manage thermal properties, the system uses optical fibers and temperature sensors to detect and monitor thermal conditions, substituting mechanical design margins with intelligent sensing and control.
2Loss of substance
If cable cross-section is reduced based on actual operating conditions, then material usage decreases, but measurement precision requirements increase
Solution Approach 1:
The patent applies the nested doll principle by integrating optical fibers and temperature sensors directly within the cable insulation structure. The sensing elements are nested within the cable layers, allowing close proximity to the conductor for accurate temperature measurement while using minimal additional space, enabling precise monitoring with compact sensor integration.
Solution Approach 2:
The patent uses optical fiber technology to create an information copy of the thermal state along the cable. The optical fiber acts as a distributed sensor that copies temperature information from the cable environment into optical signals that can be precisely measured and analyzed, enabling high-precision temperature profiling without physical contact with the conductor.
3Measurement precision
If optical fiber is integrated into cable insulation, then temperature measurement capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by combining the cable insulation manufacturing process with the optical fiber integration process. The optical fiber is embedded within the insulation material during the extrusion or molding process, merging two manufacturing operations into one. This eliminates separate assembly steps and reduces overall manufacturing complexity despite the added functionality.
Solution Approach 2:
The patent applies universality by designing the cable insulation to serve multiple functions: electrical insulation, mechanical protection, and thermal sensing housing. The insulation structure is designed to accommodate the optical fiber while maintaining its primary electrical insulation function, creating a multi-functional component that reduces the need for separate sensing housings or mounting structures.
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
This solution allows for adaptive cable dimensioning based on actual operating conditions, reducing the risk of overheating and maintaining system functionality while minimizing cable size and power consumption.
Implementation Method 1
An optical measuring device is used to couple a light signal into the optical fiber. Reflectometry is proposed for measuring the conductor temperature based on this coupled light signal.
Implementation Method 2
an optical fiber guided within the insulation be in direct contact with the cable conductor
Data Source
Figure 1
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AI summary
A motor vehicle electrical system comprising an electrical cable with a metallic conductor and electrical insulation surrounding the conductor, an optical fiber guided in the insulation, wherein the optical fiber is at least partially in direct contact with the conductor and an optical measuring device provided for coupling a light signal into the optical fiber and for measuring a conductor temperature based on the coupled light signal by means of reflectometry.