Power Device Parameter Adjustment via Thermal Restoration
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Solution Overview
Problem
Aging power devices in electric vehicles, such as IGBTs and power MOSFETs, experience changes in electrical parameters like threshold voltage and on-resistance, leading to degraded vehicle performance and the inconvenience of expensive replacements requiring service station visits, with a need to detect and adjust these parameters effectively.
Innovation Solution
A system comprising a computer with a processor programmed to measure and adjust the electrical parameters of power devices by heating them to restore parameters within predetermined ranges, using a coolant path to transfer heat and monitor adjustment times, with human-machine interface authorization for adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power devices are replaced to restore electrical parameters, then vehicle performance is improved, but cost and convenience deteriorate due to expensive replacements and service station visits
Solution Approach 1:
The patent applies parameter changes by heating the power device to a specific temperature range (e.g., 80°C to 120°C) to restore its electrical parameters. This thermal treatment modifies the physical state of the power device, causing drift in electrical parameters such as threshold voltage and on-resistance to return to acceptable ranges, thereby restoring vehicle performance without replacement
2Reliability
If power devices are replaced to restore electrical parameters, then vehicle performance is improved, but cost and convenience deteriorate due to expensive replacements and service station visits
Solution Approach 1:
The system enables self-service by allowing the power device to be restored in-vehicle through controlled heating. The measurement unit detects parameter drift, the controller determines appropriate heating duration, and the heating unit applies thermal treatment. This self-contained process eliminates the need for service station visits and expensive replacements, significantly reducing costs
3Reliability
If heating is applied to adjust power device parameters, then parameter restoration is achieved, but time and energy consumption increase
Solution Approach 1:
The system implements feedback by using the measurement unit to continuously monitor electrical parameters during and after heating. The controller receives real-time data on parameter changes, compares them against target ranges, and adjusts the heating duration accordingly. This closed-loop feedback mechanism optimizes the heating process, ensuring parameter restoration while minimizing unnecessary time and energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables efficient detection and adjustment of power device parameters, improving vehicle performance without the need for costly replacements, allowing for in-vehicle parameter restoration and data storage for statistical analysis.
Implementation Method 1
pump coolant along a coolant path to transfer heat from the heating unit to the power device
Data Source
AI summary
A computer includes a processor; and a memory. The memory stores instructions executable by the processor to determine, based on a measurement performed in a vehicle, that a parameter of a power device is outside of a predetermined range; and actuate components in the vehicle to heat the power device.