Dual Voltage Measurement for Reliable EV High-Voltage Shutdown
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Solution Overview
Problem
Existing methods for ensuring the safety of high-voltage systems in electrical and hybrid vehicles are inadequate, as they rely on external devices that can malfunction or provide faulty readings, posing risks during servicing and repairs.
Innovation Solution
A measurement system with two independent voltage measurement units connected between the positive and negative poles of the power system, which simultaneously measure pole-to-pole voltages and compare them to detect voltage differences, providing an indication of unreliable measurements and alerting users to potential hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external device is connected to measure voltage in the power system, then voltage measurement can be performed, but the risk of faulty connection or device malfunction increases
Solution Approach 1:
The power system performs its own voltage measurement using integrated voltage measurement units (VMUs) instead of requiring external measurement devices. The VMUs are built-in components that continuously monitor the voltage between positive and negative poles, eliminating the need for external devices that could malfunction or provide faulty readings. This self-measurement capability ensures both accuracy and reliability of voltage measurements.
Solution Approach 2:
The system uses multiple voltage measurement units (at least two) to create redundant measurements of the same voltage parameter. By comparing measurements from multiple independent VMUs, the system can verify measurement reliability and detect potential faults. This redundancy approach allows the system to cross-validate measurements and identify unreliable readings without requiring external verification devices.
2Ease of operation
If manual shutdown methods are used to disconnect the high-voltage system, then the system can be shut down, but the risk of improper shutdown increases
Solution Approach 1:
The measurement system continuously monitors voltage levels and provides feedback to the control system about the actual voltage state. This feedback mechanism ensures that shutdown procedures are properly executed by verifying that voltage has dropped to safe levels. The system can detect if a manual shutdown was incomplete or improper by monitoring whether voltage measurements indicate the system is truly disconnected, thereby ensuring reliable shutdown operation.
3Object-affected harmful factors
If secure measurement is performed using external devices as required by safety standards, then safety compliance is achieved, but the risk of faulty results remains
Solution Approach 1:
The power system performs its own voltage measurement using integrated voltage measurement units (VMUs) instead of requiring external measurement devices. The VMUs are built-in components that continuously monitor the voltage between positive and negative poles, eliminating the need for external devices that could malfunction or provide faulty readings. This self-measurement capability ensures both accuracy and reliability of voltage measurements.
Solution Approach 2:
The system uses multiple voltage measurement units (at least two) to create redundant measurements of the same voltage parameter. By comparing measurements from multiple independent VMUs, the system can verify measurement reliability and detect potential faults. This redundancy approach allows the system to cross-validate measurements and identify unreliable readings without requiring external verification devices.
Data Source
AI summary
A measurement system for determining a status of a high-voltage power system in a vehicle, the measurement system comprising: a first voltage measurement unit and a second voltage measurement unit, each of the first and second voltage measurement units being connected between a positive pole and a negative pole of the power system; a measurement system control unit connected to the first and second voltage measurement unit and configured to: control the first and second voltage measurement unit to simultaneously measure a voltage to determine a respective first and second pole-to-pole voltage; compare the first pole-to-pole voltage with the second pole-to-pole voltage, and if a voltage difference is higher than a voltage threshold value, provide an indication that the voltage measurement is not reliable.