Automotive Wiring Optimization via Short Circuit Analysis
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Solution Overview
Problem
Conventional automotive electrical wiring design often results in oversized wire gauges due to a lack of precise calculations, leading to increased weight, cost, and potential overheating during short circuits, as designers rely on best guesses before finalizing circuit details.
Innovation Solution
A computer-aided design tool that automatically selects the most efficient wiring size based on fuse size, type, and environment, calculating short circuit current, voltage drop, and blow time to ensure requirements are met while using the smallest acceptable wire sizes, thereby optimizing wire sizes from the outset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire size is increased to ensure safe operation during short circuits, then reliability is improved, but weight and cost increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting wire gauge selection based on calculated short circuit currents, fuse blow times, and temperature ratings. Instead of using fixed oversized wires, the system calculates optimal wire parameters (gauge size, cross-sectional area) that meet safety requirements while minimizing weight. This is achieved through iterative evaluation of wire temperature during short circuits and adjustment of wire size parameters accordingly.
Solution Approach 2:
The patent implements preliminary action by performing short circuit analysis and wire size optimization during the design phase before manufacturing. The system calculates prospective short circuit currents, determines fuse blow times, and selects appropriate wire gauges in advance using computer-aided design tools. This preliminary calculation prevents the need for iterative redesign and ensures optimal wire sizing from the beginning, avoiding both over-sizing and under-sizing.
2Temperature
If wire size is increased to prevent overheating during short circuits, then temperature control is improved, but material cost increases
Solution Approach 1:
The patent uses parameter changes by evaluating wire temperature as a function of wire gauge, length, and short circuit current duration. The system calculates the temperature rise during short circuits using electrical resistance, current, and time parameters, then adjusts wire cross-sectional area to keep temperature below insulation rating. This precise parameter control eliminates the need for excessive copper material while ensuring temperature safety.
Solution Approach 2:
The patent replaces mechanical trial-and-error wire sizing with computer-aided design calculations and simulation tools. Instead of physically testing different wire sizes, the system uses software to calculate optimal wire dimensions based on electrical parameters, fuse characteristics, and thermal constraints. This substitution of computational analysis for physical iteration reduces material waste and accelerates the design process.
3Productivity
If wire size is reduced to minimize weight and cost, then productivity is improved, but reliability deteriorates due to potential overheating
Solution Approach 1:
The patent replaces traditional mechanical trial-and-error design methods with computer-aided engineering software that automatically calculates optimal wire sizes. The system integrates electrical load analysis, short circuit simulation, and thermal evaluation to determine precise wire gauge requirements. This computational approach maintains reliability while enabling faster design iterations and reducing the need for physical prototyping and testing.
Solution Approach 2:
The patent implements feedback mechanisms by continuously evaluating wire temperature during short circuit simulation and adjusting wire size selections accordingly. The design tool provides feedback on whether proposed wire gauges meet temperature and current carrying requirements, allowing designers to iteratively optimize wire sizes. This feedback loop ensures that minimal wire sizes are selected while still meeting all safety and performance criteria.
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 approach ensures that wiring harnesses are designed to meet all requirements, including short circuit performance and steady-state current carrying capabilities, while minimizing wire size and weight, thus reducing material costs and preventing overheating.
Implementation Method 1
the greater the heat produced and the greater the temperature that the wiring must withstand during the short circuit
Data Source
AI summary
A method is provided for selecting wiring components for a circuit including at least one predetermined load. A user identifies a fuse type. A target current needed to achieve a desired fuse blow time for the identified fuse type is obtained from a lookup table. A minimum wire size for supporting steady state operation of the circuit is also obtained from a lookup table. The user identifies one or more wire segments to be included in the circuit, including specifying each respective wire length. An aggregate circuit resistance including each identified wire segment is calculated, wherein when a wire segment is first identified it is assigned the minimum wire size and its resistance is determined based on its respective length. A provisional short circuit current is calculated in response to the aggregate circuit resistance. The provisional short circuit current is compared to the target current. If the provisional short circuit current is less than the target current, the user is prompted to select an increased wire size for at least one wire segment. Otherwise, an optimized circuit is indicated to the user.