Electric Drive Thermal Protection via Torque Attenuation
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Solution Overview
Problem
Electric drive systems in powertrains face challenges in managing heat buildup, as electrical components are sensitive to temperature and can suffer from thermal damage, making it difficult to monitor and mitigate elevated temperatures without distributed sensors.
Innovation Solution
Implementing a control module that monitors temperature conditions at key locations like the power inverter module and electric motor assembly, using temperature sensors to adjust the maximum torque output of the electric motor based on temperature thresholds, thereby reducing heat generation and preventing thermal damage through torque attenuation or system shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If torque output is increased to improve power delivery, then power output is improved, but heat generation increases causing thermal damage risk
Solution Approach 1:
The control module continuously monitors temperature conditions at predetermined locations (power inverter module and electric motor assembly) and uses this feedback to dynamically adjust the maximum allowable torque. When temperature exceeds thresholds, the system reduces torque output to prevent thermal damage, creating a closed-loop control system that balances power delivery with thermal management.
Solution Approach 2:
The system dynamically adjusts the maximum allowable torque based on real-time temperature conditions rather than maintaining a fixed torque limit. The control module modifies torque output in response to changing thermal states, allowing the system to operate at high power when cool and reduce power when temperature rises, optimizing both performance and thermal safety.
2Reliability
If temperature monitoring is implemented to prevent thermal damage, then reliability is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The temperature monitoring function is merged with the existing control module that manages torque output. Rather than adding a separate dedicated thermal management system, the control module performs both torque control and temperature monitoring functions, reducing overall system complexity while maintaining comprehensive thermal protection.
Solution Approach 2:
The control module is designed to perform multiple functions: it controls torque output for power delivery and simultaneously monitors temperature conditions for thermal protection. This multi-functional approach eliminates the need for separate dedicated thermal management hardware, reducing system complexity while improving reliability through integrated monitoring and control.
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
Effectively regulates temperature to prevent thermal damage, maintaining efficient operation by reducing torque output as temperatures rise, allowing the system to recover and operate within safe temperature ranges.
Implementation Method 1
monitoring temperature conditions at predetermined locations in the electric drive system
Implementation Method 2
Electric motors of electric drive systems have provided one convenient method for this bi-directional flow of energy to and from an output shaft. One aspect of utilizing such an electric drive system is managing the buildup of heat within system components.
Data Source
AI summary
Temperature of an electric drive is regulated to prevent undesirable thermal effects. Temperature conditions of the electric drive system are monitored and torque of the electric drive system is limited based on the temperature conditions.