Vehicle Test Cable With Shielding and Leakage Detection
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Solution Overview
Problem
Existing vehicle test systems face issues with cable entanglement and electric leakage when units installed inside and outside a vehicle are connected, particularly during tests with closed doors or windows, such as those using automatic driving robots or in-vehicle exhaust gas testers.
Innovation Solution
A vehicle test system with a cable that includes a shielding layer and a leakage detection circuit, allowing for the detection of electric leakage when the sheath of conductive wires is broken, and a flat part design for easy passage through vehicle openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cable with shielding layer is used to connect test unit and control unit, then noise blocking capability is improved, but electric leakage risk increases when sheath is broken
Solution Approach 1:
The patent implements a leakage detection circuit that continuously monitors the insulation resistance between the shielding layer and ground. When insulation degradation is detected, the system provides feedback to stop the test, preventing electric leakage accidents. This feedback mechanism transforms the previously passive shielding layer into an actively monitored safety component.
Solution Approach 2:
The patent performs preliminary detection of insulation resistance before starting the test and continuously monitors during the test. By detecting potential electric leakage risks before they become hazardous, the system takes preliminary protective action to prevent accidents, rather than waiting for actual electric leakage to occur.
2Adaptability or versatility
If cable passes through door or window gap for testing, then test flexibility is improved, but cable entanglement and sheath damage risk increases
Solution Approach 1:
The patent performs preliminary inspection of the cable sheath before passing it through door or window gaps. The sheath integrity is verified in advance to ensure it can withstand the mechanical stress of passage without damage, preventing electric leakage risks that would arise from sheath breaks during the test.
Solution Approach 2:
The leakage detection circuit provides continuous feedback on cable insulation status during the test. If the cable sheath is damaged while passing through gaps, the insulation resistance changes are detected in real-time, allowing immediate termination of the test to prevent electric leakage accidents.
3Object-affected harmful factors
If multiple conductive wires are used with individual shielding layers, then noise protection is improved, but electric leakage risk increases due to more contact points
Solution Approach 1:
The patent merges multiple individual shielding layers into a single collective shielding layer that covers all conductive wires together. This reduces the number of insulation interfaces from multiple wire-shielding contacts to a single unified shielding structure, thereby reducing the total number of potential electric leakage contact points while maintaining noise protection capability.
Solution Approach 2:
The patent applies a single shielding layer with optimized local properties to cover all conductive wires collectively. Rather than having multiple separate shielding layers each with potential weak points, the unified shielding structure provides consistent protection across all wires with fewer interfaces, reducing overall electric leakage risk while maintaining local noise protection where needed.
Data Source
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AI summary
A vehicle test system 100 that tests a test object X being a vehicle or a part thereof, includes a test unit 10 that is provided on one side of an inside and an outside of the test object X, a control unit 20 that is provided on another side of the inside and the outside of the test object X, and controls the test unit 10, a cable 30 that connects the test unit 10 and the control unit 20, and includes a shielding layer 43 that blocks noise, and a leakage detection circuit 50 that is connected to the shielding layer 43.