External Reader Voltage Detection via Vehicle Bus
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Solution Overview
Problem
Existing high-voltage diagnostic systems in vehicles are unreliable, especially during development or after accidents, making it difficult to ensure safety by checking for the presence of high voltage in high-voltage components.
Innovation Solution
A method involving an external reader connected to the vehicle's communications bus to directly read signals from high-voltage components or their control units, indicating the presence of high voltage, which increases reliability and safety without modifying the vehicle or the diagnostic system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external reader is connected to the communications bus to directly read high voltage signals, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The external reader serves as an intermediary device that connects to the existing communications bus to read high voltage signals. This mediator approach allows reliable measurement without directly interfacing with the high voltage component, thereby maintaining system reliability while avoiding excessive complexity in the measurement apparatus.
2Ease of operation
If the diagnostic system is used to check for high voltage presence, then ease of operation is improved, but reliability deteriorates
Solution Approach 1:
The high voltage measurement function is extracted from the unreliable built-in diagnostic system and implemented through an external reader that directly accesses the communications bus. This separation allows the measurement function to operate independently and reliably, while maintaining ease of operation through the same user interface.
3Measurement precision
If modifications are made to the high voltage component or control unit to enable signal output, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The high voltage component or control unit already possesses the capability to output signal information about its operational state through the communications bus. The external reader utilizes this self-service information output without requiring any modifications to the vehicle's existing components, thereby maintaining measurement precision while preserving ease of manufacture.
Data Source
AI summary
A method is provided for indicating a presence of a high voltage at a high-voltage component equipped in a vehicle. The method includes the steps of connecting an external reader to a communication bus of the vehicle, outputting a signal by way of the high-voltage component or by way of a component control unit which is connected to the high-voltage component, to the communication bus, wherein the signal indicates whether a high voltage is present at the high-voltage component, and reading the signal from the communications bus by way of the external reader.