Charging Connector Temperature Derivative Control for Thermal Prevention
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Solution Overview
Problem
Existing vehicle charging systems struggle to predict and prevent thermal events at charging connectors effectively, as temperature thresholds alone may not suffice to prevent thermal events once significant energy accumulation has occurred, leading to potential faults.
Innovation Solution
A data processing system calculates time derivatives of temperature measurements from multiple sensors at a charging plug to predict thermal events, adjusting charging rates or stopping the process when derivatives exceed predefined thresholds, thereby preventing thermal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature threshold monitoring is used to control charging, then thermal events can be detected, but thermal events cannot be prevented once significant energy accumulation has occurred
Solution Approach 1:
The system calculates the time derivative of temperature to detect thermal events before they occur. By monitoring the rate of temperature change (dT/dt) rather than just the absolute temperature, the system can identify accelerating thermal conditions and take preventive action before significant energy accumulation happens, thus preventing thermal events in advance
Solution Approach 2:
The system applies preliminary anti-action by using derivative-based detection to counteract thermal event development before it becomes harmful. When the temperature derivative exceeds a threshold, the system immediately adjusts charging parameters or terminates charging, preventing the thermal event from progressing to a dangerous state
2Reliability
If charging is stopped immediately when temperature threshold is reached, then thermal events may be prevented, but charging efficiency is reduced due to late detection
Solution Approach 1:
By monitoring the time derivative of temperature, the system performs preliminary detection of thermal trends before the actual thermal event occurs. This allows the system to maintain charging at efficient rates while still detecting early signs of thermal problems and taking preventive action only when necessary, thus preserving charging efficiency while ensuring thermal safety
Solution Approach 2:
The system continuously calculates temperature derivatives and uses this feedback to dynamically adjust charging parameters. This real-time feedback mechanism allows the system to maintain high charging efficiency during normal operation while automatically reducing or stopping charging only when the derivative indicates an emerging thermal event, optimizing both safety and efficiency
Data Source
AI summary
A system can include a data processing system including one or more memory devices coupled with one or more processors. The data processing system can receive measurements of a temperature of a connector of a vehicle, the connector to charge the vehicle. The data processing system can determine a derivative using the measurements. The data processing system can control charging of the vehicle based on the derivative.