Vehicle Power Distribution Cutoff Coordination for Wire Protection
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Solution Overview
Problem
Existing in-vehicle power distribution devices face issues with electric wire protection when in-vehicle devices are changed or added, leading to simultaneous cutoff or erroneous cutoff of switches and fuses, and require redesign of the electric wire protection function.
Innovation Solution
A power distribution device with first and second cutoff units and control units that adjust cutoff characteristics based on heat and energization time, allowing automatic adaptation to changes in in-vehicle devices without redesign, ensuring electric wire protection from upstream to downstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the extension portion in the relay device is changed every time an in-vehicle device is added or changed, then the electric wire protection function can be maintained, but the burden of designing the power protection function increases
Solution Approach 1:
The power distribution device automatically detects changes in connected in-vehicle devices and autonomously adjusts its power distribution strategy and protection characteristics without requiring manual redesign or intervention. The system monitors current consumption patterns and dynamically reconfigures cutoff characteristics to maintain electric wire protection while adapting to new devices.
Solution Approach 2:
The power distribution device employs dynamic cutoff characteristics that can be adjusted in real-time based on the connected load conditions. The cutoff time and current thresholds are not fixed but can be modified according to the detected device configuration, allowing the system to maintain protection functionality while adapting to changes in the electrical network.
2Productivity
If power allocation is adjusted according to priority when the sum of currents approaches the power control characteristic, then power distribution control is improved, but the operation of in-vehicle devices with low priority is sacrificed
Solution Approach 1:
The power distribution device dynamically adjusts power allocation based on real-time current consumption and detected device changes. When new devices are detected or current load changes, the system automatically recalibrates the power distribution strategy and priority settings, ensuring that previously sacrificed low-priority devices can resume normal operation when conditions permit, rather than maintaining static priority assignments.
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
Ensures electric wire protection without redesign by dynamically adjusting cutoff characteristics, preventing simultaneous cutoff and protecting the electric wire from overheating.
Implementation Method 1
a first cutoff characteristic indicating a relationship between an amount of heat of the first electric wire and a first cutoff time that is a time from a start of energization of the first electric wire
Data Source
AI summary
There is provided a power distribution device: a first and second power distribution devices. The first power distribution device includes: a first cutoff unit; and a first control unit that controls the first cutoff unit based on a first cutoff characteristic. The second power distribution device includes: a second cutoff unit; and a second control unit that controls the second cutoff unit based on a second cutoff characteristic. The first cutoff characteristic and the second cutoff characteristic are initially set such that the first cutoff time is longer than the second cutoff time. The first control unit executes a cutoff characteristic change process of changing the first cutoff characteristic such that the first cutoff time is longer than the second cutoff time when the in-vehicle device is changed or added and the second cutoff characteristic is changed and the first cutoff time is shorter than the second cutoff time.