High-Voltage Grid Disconnection Control for Vehicle Maintenance Safety
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Solution Overview
Problem
Existing methods for securing a high-voltage onboard electric grid of a motor vehicle during repair and maintenance rely heavily on procedural measures, which are prone to human error and uncertainty, potentially leading to unintended reactivation of the electric voltage.
Innovation Solution
The method involves automatically blocking energy inflows into the high-voltage onboard electric grid using a control device, which can be integrated into the vehicle or communicated with via a radio connection, to prevent reactivation by deactivating or mechanically blocking energy sources such as the contactor, generator, charging device, and internal combustion engine, ensuring the grid remains disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If procedural measures are used to secure the high-voltage grid during maintenance, then the system can be secured for work, but human error may lead to inadvertent reactivation of voltage
Solution Approach 1:
The control device automatically monitors and maintains the blocked state of energy inflows without requiring continuous human intervention. The system serves itself by detecting dangerous situations and autonomously preventing voltage reactivation, eliminating reliance on human compliance with procedural measures.
Solution Approach 2:
The control device continuously monitors the state of energy inflows and provides feedback to maintain the blocked state. This feedback mechanism ensures that any attempt to reactivate voltage is detected and prevented, thereby maintaining safety without requiring ongoing human supervision.
2Reliability
If multiple energy inflows are blocked to prevent voltage reactivation, then safety is improved, but device complexity increases
Solution Approach 1:
The control device serves multiple functions by monitoring and blocking various energy inflows (high-voltage battery, generator, charging device) through a single integrated system. This multi-functional approach prevents voltage reactivation from multiple sources without requiring separate complex systems for each energy inflow.
Solution Approach 2:
The patent combines the monitoring and blocking functions for multiple energy inflows into a single control device. By merging these functions, the system achieves comprehensive safety coverage while reducing the overall complexity that would result from having separate systems for each energy source.
3Reliability
If a control device is used to automatically block energy inflows, then human error is eliminated, but the system requires additional technical components
Solution Approach 1:
The control device automatically detects dangerous situations and maintains the blocked state of energy inflows without requiring human intervention. This self-service capability eliminates human error while the integrated design keeps the additional technical components manageable.
Solution Approach 2:
The control device acts as an intermediary between the energy sources and the high-voltage grid, automatically preventing dangerous situations. This intermediary function eliminates human error by providing automated monitoring and control, while the mediator role allows the system to manage complexity through centralized coordination.
Data Source
AI summary
In a method for securing a high voltage on-board electric grid of a motor vehicle for repair and/or maintenance of the motor vehicle, the energy inflow of an energy supply unit into the onboard electric grid is blocked during or after a voltage disconnection of the high-voltage on-board electric grid, in which an energy inflow of the energy supply unit to the high-voltage on-board electric grid is interrupted. Additionally or alternatively, the energy inflow of at least one other energy supply device is blocked, wherein the at least one other energy inflow is designed in order to supply energy from a further energy source to the high-voltage on-board electric grid.