Vehicle Maintenance Power Cutoff for High- and Low-Voltage Loads
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Solution Overview
Problem
Eco-friendly vehicles face safety risks during maintenance due to potential electric shocks from high-voltage and low-voltage power systems, which can lead to accidents if power is inadvertently applied.
Innovation Solution
A vehicle system that includes a controller and input device to cut off both high-voltage and low-voltage power supplies during maintenance, using a power controller and switch to manage power distribution and ensure safe disconnection through a vehicle communication network, determining the vehicle's state based on speed, gear shifting, and parking brake to prevent power supply when stopped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied to vehicle systems during maintenance, then vehicle functionality is maintained, but safety accidents such as electric shock may occur
Solution Approach 1:
The system performs preliminary actions by automatically cutting off power to first loads (high-voltage components) when it detects that the vehicle is in a maintenance state, before any maintenance work begins. This preventive power cutoff eliminates the risk of electric shock during maintenance while preserving the ability to supply power to second loads (low-voltage components) for maintenance equipment operation.
2Reliability
If all power is cut off during maintenance, then safety is improved, but vehicle systems cannot be operated or tested
Solution Approach 1:
The power supply system is segmented into two distinct categories: first loads (high-voltage components such as motors and powertrains) and second loads (low-voltage components such as maintenance equipment and diagnostic tools). During maintenance, power is selectively cut off from first loads while continuing to supply power to second loads, enabling both safety and operational flexibility simultaneously.
Solution Approach 2:
Different power supply conditions are applied to different parts of the vehicle system based on their specific requirements. High-voltage first loads receive cut-off power for safety, while low-voltage second loads continue receiving power to support maintenance operations, creating localized power management that addresses both safety and functionality needs.
3Reliability
If the system automatically determines vehicle state to cut off power, then safety is enhanced, but system complexity increases
Solution Approach 1:
The controller automatically detects the vehicle's maintenance state and autonomously executes power cutoff decisions without requiring manual intervention or complex external monitoring systems. The system serves itself by using its own sensors and logic to determine when maintenance mode is active and accordingly managing power distribution, thereby enhancing safety while minimizing additional system complexity.
Data Source
AI summary
A vehicle may include at least one battery and an input device configured to receive a user input for cutting off power supplied from the at least one battery. The vehicle may also include at least one first load configured to receive a first power from the at least one battery and at least one second load configured to receive a second power smaller than the first power from the at least one battery. The vehicle may further include a controller configured to cut off power supplied to the at least one first load or the at least one second load based on the user input received through the input device.