EV Temperature Sensor Diagnosis During Motor Lock Startup
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Solution Overview
Problem
Existing electric vehicle diagnostic systems face challenges in accurately diagnosing temperature sensors during motor lock conditions, where large differences in detected values can lead to incorrect diagnostic results, and struggle to recognize motor lock occurrences immediately before system startup.
Innovation Solution
The electric vehicle diagnostic apparatus incorporates a controller that performs mask processing to prevent shift and linearity diagnoses during motor lock conditions and adjusts the length of mask processing time based on the discrepancy between temperature sensor outputs, ensuring accurate diagnostics and avoiding erroneous results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mask processing is performed at system startup to prevent false diagnostics, then diagnostic reliability is improved, but diagnostic time is extended
Solution Approach 1:
The mask processing duration is made dynamic rather than fixed. The controller adjusts the mask processing time based on real-time temperature sensor output discrepancies and motor lock detection, allowing the system to extend mask processing when needed for reliability while reducing it when not necessary, thus optimizing the trade-off between diagnostic reliability and diagnostic time.
Solution Approach 2:
The system changes the parameter of mask processing duration based on detected conditions. When temperature sensor output discrepancy exceeds a threshold or motor lock is detected, the mask processing time is extended; otherwise, it uses a standard shorter duration, allowing adaptive optimization of diagnostic reliability versus time loss.
2Measurement precision
If mask processing time is extended to ensure accurate diagnostics during motor lock, then diagnostic precision is improved, but system productivity decreases
Solution Approach 1:
The mask processing time is dynamically adjusted based on whether motor lock is detected and the magnitude of temperature sensor discrepancies. The system extends mask processing only when necessary for accurate diagnostics during motor lock conditions, rather than always using a long fixed duration, thus maintaining diagnostic precision while minimizing impact on system productivity.
Solution Approach 2:
The controller changes the mask processing duration parameter based on operational conditions. When motor lock is detected or temperature discrepancies exceed thresholds, the system uses an extended mask processing time for precise diagnostics; otherwise, it uses a shorter duration to maintain system productivity, achieving a conditional optimization of both precision and productivity.
3Productivity
If the system performs diagnosis immediately at startup, then productivity is improved, but diagnostic accuracy deteriorates due to undetected motor lock conditions
Solution Approach 1:
The system performs preliminary mask processing at system startup before conducting the actual temperature sensor diagnosis. This preliminary action extends the mask processing duration when motor lock is detected or temperature discrepancies are large, ensuring that the subsequent diagnostic measurements are not corrupted by undetected motor lock conditions, thus maintaining both productivity and accuracy.
Solution Approach 2:
The system applies preliminary anti-action by extending mask processing at startup to prevent the harmful effect of undetected motor lock conditions from affecting diagnostic accuracy. By proactively extending the mask duration based on initial temperature discrepancies or motor lock detection, the system prevents false diagnostics while still enabling timely diagnosis execution.
Data Source
AI summary
An electric vehicle diagnostic apparatus to be installed in an electric vehicle including a temperature sensor configured to detect a temperature of a drive motor or a temperature of an inverter configured to drive the drive motor includes a controller. The controller is configured to make a diagnosis of the temperature sensor. The controller is configured to perform mask processing in which the diagnosis is not made at system startup of the electric vehicle. The controller is configured to switch a length of time of the mask processing in accordance with a condition.