Motor Torque Control via Thermal Feedback
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Solution Overview
Problem
Existing vehicle systems fail to effectively control motor torque in response to varying motor temperatures, leading to potential overheating and reduced performance in hybrid electric vehicles (HEVs) and battery electric vehicles (BEVs).
Innovation Solution
A vehicle system that includes temperature sensors to monitor the housing and stator temperatures, with a controller that compares these readings to predetermined thermal data to evaluate motor performance and adjust motor torque accordingly, ensuring optimal operation and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If motor torque is increased to improve vehicle propulsion performance, then power output is improved, but motor temperature increases leading to overheating
Solution Approach 1:
The system continuously monitors motor temperature through sensors and feeds this information back to the controller, which adjusts motor torque in real-time based on thermal conditions, creating a closed-loop control system that prevents overheating while maximizing performance
Solution Approach 2:
The motor torque control is made dynamic by continuously adjusting the torque output based on real-time temperature measurements, allowing the system to adapt torque levels to current thermal conditions rather than maintaining a fixed torque setting
2Temperature
If motor torque is reduced to prevent overheating, then motor temperature is controlled, but vehicle propulsion performance deteriorates
Solution Approach 1:
The system takes preliminary action by monitoring temperature trends and proactively adjusting motor torque before critical overheating occurs, using predictive thermal management to maintain performance while preventing temperature excursions
Solution Approach 2:
The system changes the torque parameter dynamically based on temperature measurements, adjusting the torque output to optimal levels that prevent overheating while maintaining sufficient propulsion performance for current operating conditions
3Productivity
If continuous motor operation is maintained to improve productivity, then vehicle propulsion continues, but thermal accumulation leads to reduced reliability
Solution Approach 1:
The continuous feedback mechanism monitors thermal conditions during sustained operation and adjusts torque to keep temperatures within safe operating limits, enabling continuous propulsion while maintaining motor reliability through active thermal management
Solution Approach 2:
The system maintains continuous useful action by dynamically adjusting torque to prevent thermal shutdowns, allowing the motor to operate continuously at optimized power levels that balance propulsion needs with thermal constraints
Data Source
AI summary
A vehicle having a vehicle system is provided with a motor having a housing and a stator. The motor is configured to provide motor torque for vehicle propulsion. The vehicle system is also provided with at least one controller that is configured to receive input indicative of at least one of the housing temperature and the stator temperature, and control the motor torque based on a comparison of the input to predetermined thermal data.