Compressor Outlet Pressure Control for EV Thermal Management
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Solution Overview
Problem
Existing thermal management systems in electric vehicles with electric traction motors face challenges in efficiently cooling critical components, particularly when the compressor output pressure exceeds thresholds, potentially leading to overheating and component damage.
Innovation Solution
A method and system for operating a thermal management system that includes circulating coolant through thermal loads, using a refrigerant circuit with a compressor and condenser to cool additional loads, and controlling the compressor's outlet pressure based on temperature signals from sensors to prevent overheating, ensuring efficient cooling of the electric traction motor, cabin, and battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor operates at high output pressure to increase cooling capacity, then the cooling effectiveness improves, but the risk of overheating and component damage increases
Solution Approach 1:
The system dynamically adjusts compressor output pressure based on real-time temperature feedback from thermal loads. The control system continuously monitors temperature conditions and modulates compressor pressure accordingly, transitioning from static high-pressure operation to dynamic pressure control that adapts to changing thermal demands, thereby maintaining cooling effectiveness while preventing overheating damage
Solution Approach 2:
The system implements a feedback control mechanism where temperature sensors monitor thermal loads and send signals to the control system, which then adjusts compressor output pressure. This closed-loop feedback ensures that cooling capacity is optimized while preventing excessive pressure that could cause component damage, directly resolving the contradiction between cooling effectiveness and component safety
2Productivity
If the compressor outlet pressure is increased to meet high cooling demand, then the cooling capacity increases, but the likelihood of exceeding safe pressure thresholds increases
Solution Approach 1:
The system changes the operating parameters of the compressor by dynamically adjusting output pressure based on thermal load conditions. Instead of operating at fixed high pressure, the compressor pressure is modulated to match actual cooling demands, ensuring high cooling capacity when needed while preventing excessive pressure that could cause harm to system components
3Reliability
If the system prioritizes cooling of multiple thermal loads, then the overall thermal management effectiveness improves, but the complexity of pressure control increases
Solution Approach 1:
The control system serves multiple thermal loads (electric traction motor, cabin, battery pack) through a unified pressure control mechanism. By using a single compressor with dynamically adjustable output pressure that responds to aggregate thermal demands, the system achieves effective multi-load cooling without requiring separate complex control systems for each load, thus maintaining reliability while managing complexity
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 effectively manages thermal loads by dynamically controlling compressor pressure, preventing overheating and ensuring the safe operation of electric traction motors, cabin, and battery packs, thereby extending component lifespan and preventing damage.
Implementation Method 1
a refrigerant circuit including a compressor configured to compress refrigerant
Implementation Method 2
a refrigerant circuit including a compressor configured to compress refrigerant and a condenser
Implementation Method 3
a refrigerant circuit including a compressor configured to compress refrigerant and a condenser
Implementation Method 4
a coolant system configured to convey coolant through a first thermal load
Implementation Method 5
a coolant system configured to convey coolant through a first thermal load
Data Source
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AI summary
A thermal management system is provided for a vehicle having an electric traction motor. The system includes a coolant system configured to convey coolant through a first thermal load, a refrigerant circuit including a condenser and a compressor configured to compress a refrigerant, a control system and a sensor. The refrigerant circuit is configured to cool at least one second thermal load. The sensor is configured to send signals to the control system that are indicative of a temperature of the first thermal load. The control system is configured to control an outlet pressure of the compressor based on the signals.