Vehicle Power Supply Loop Isolation via Voltage Thresholds
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Solution Overview
Problem
Existing vehicle power supply systems cannot detect and isolate earth faults in the power supply path, as they rely on current magnitude and direction detection, which does not account for voltage fluctuations, leading to power disruption when an earth fault occurs.
Innovation Solution
A vehicle power supply system with a control unit that detects voltage drops across electrical connection units and uses cut-off switches to isolate faulty sections, ensuring power is rerouted through other paths, even if an earth fault occurs, by setting a voltage threshold below the normal operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current magnitude and direction detection is used to detect faults, then short circuit detection is achieved, but earth fault detection is not possible
Solution Approach 1:
The patent changes the detection parameter from current magnitude and direction to voltage magnitude. By monitoring voltage drops across electrical connection units, the system can detect both short circuits and earth faults. The voltage-based detection method provides a new parameter perspective that overcomes the limitations of current-based detection, enabling comprehensive fault coverage including earth faults that were previously undetectable.
2Reliability
If a loop-shaped power supply path is constituted, then power can be supplied by detaching short-circuited portions, but earth fault portions cannot be detached
Solution Approach 1:
The patent introduces voltage sensors as intermediary detection devices that monitor voltage drops across electrical connection units. These sensors act as mediators between the power supply path and the control unit, providing real-time voltage information that enables the control unit to identify and isolate earth fault portions. The voltage sensors serve as the critical intermediary that makes earth fault detection and isolation possible in the loop-shaped configuration.
3Reliability
If voltage monitoring is added to detect earth faults, then detection capability improves, but system complexity increases
Solution Approach 1:
The patent merges the voltage monitoring function into the existing electrical connection units by integrating voltage sensors directly into these units. This consolidation approach allows multiple detection functions to be performed through a unified monitoring system, reducing overall system complexity. The control unit processes voltage information from all electrical connection units through a single centralized logic, avoiding the need for separate complex monitoring circuits for each connection point.
Data Source
AI summary
A vehicle power supply system includes a power supply path, and an ECU detaching a fault occurrence portion occurring in a part of the power supply path from the power supply path based on a set value lower than a lowest operation voltage of a load and a voltage related to the power supply path. The set value is set within a normal range of the voltage related to the power supply path. The power supply path includes a plurality of electrical connection units connected to the load and a plurality of connection wirings connecting each of the electrical connection units in a loop shape. In a case that a part of voltages related to each of the connection wirings is equal to or less than the set value, the control unit supplies power to the load via another part of the voltages related to each of the connection wirings.