Vehicle Composite Cable Crosstalk Prevention via Power Wire Segmentation
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Solution Overview
Problem
In vehicle composite harnesses, crosstalk between signal lines can occur when power wires and signal lines without shield conductors are collectively covered with a single sheath, especially with the increasing use of plural sensors on wheels.
Innovation Solution
A vehicle composite cable design featuring a pair of power wires and two twisted pair signal lines, where the signal lines are not covered with a shield conductor, and are separated by the power wires within a shared sheath, preventing crosstalk by maintaining a specific distance through the placement of power wires between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield conductor is provided on each signal line to prevent crosstalk, then crosstalk prevention is improved, but device complexity and weight increase
Solution Approach 1:
The cable is segmented into distinct functional zones: a power wire region and a signal wire region. By spatially separating power wires from signal lines and grouping them into different regions within the sheath, the invention prevents crosstalk without requiring shield conductors on each signal line, thus reducing complexity while maintaining reliability
Solution Approach 2:
Multiple signal lines are collectively covered by a single sheath without individual shield conductors, merging the protection function at the cable level rather than at the individual wire level. This reduces the number of shield conductors needed while maintaining crosstalk prevention through the power wire separation arrangement
2Reliability
If shield conductors are added to each signal line, then crosstalk prevention is improved, but weight increases
Solution Approach 1:
By segmenting the cable into power wire regions and signal wire regions and separating them spatially, the invention eliminates the need for heavy shield conductors on each signal line, significantly reducing cable weight while maintaining crosstalk prevention through the segmented arrangement
Solution Approach 2:
The invention extracts and removes the shield conductor component from individual signal lines, replacing it with a simpler power wire separation arrangement. This extraction eliminates unnecessary weight while achieving the same crosstalk prevention function through a different mechanism
3Volume of moving object
If signal lines are closely bundled to reduce cable diameter, then compactness is improved, but crosstalk increases
Solution Approach 1:
The cable cross-section is segmented into distinct power wire regions and signal wire regions. By creating these segmented zones separated by insulating layers, the invention maintains compact overall diameter while preventing crosstalk through the regional separation, avoiding the need for loose bundling of all wires together
Solution Approach 2:
Different regions of the cable cross-section have different functional qualities: power wire regions contain high-current conductors, while signal wire regions contain low-voltage signal lines. This local differentiation of quality allows compact arrangement while preventing harmful interactions between different signal types
Data Source
AI summary
A vehicle composite cable includes a pair of power wires for supplying a current to an electric parking brake unit that generates a braking force after stopping a vehicle, a first signal line including a twisted pair wire transmitting a first electrical signal during when the vehicle is in motion, a second signal line including a twisted pair wire for transmitting a second electrical signal also during when the vehicle is in motion, and a sheath collectively covering the pair of power wires and the first and second signal lines. The first and second signal lines are not covered with a shield conductor, and the first signal line is separated from the second signal line by the pair of power wires.