EV Motor Torque Compensation via Integrated Controller Segmentation
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Solution Overview
Problem
Electric vehicle motors face thermal management challenges due to heat generation and temperature changes, requiring an integrated cooling system that effectively compensates for errors in motor performance and communication issues between components.
Innovation Solution
An integrated control method and system that uses a controller to detect output torque values of drive and compressor motors, adjust torque outputs based on predetermined reference values, and manage the water pump motor's operation based on temperature and communication status to ensure optimal cooling and compensation for motor errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling line is used for all power and electronic components, then the device complexity is reduced, but the reliability of motor operation deteriorates due to inability to provide compensated control when error occurs
Solution Approach 1:
The controller segments the control of multiple motors (drive motor, compressor motor, water pump motor) and independently monitors torque values of each motor. When an error is detected in one motor, the controller can compensate by adjusting the operation of other motors, thereby maintaining reliability without requiring physically separate cooling lines for each component.
2Reliability
If integrated control of multiple motors is implemented, then the reliability is improved through compensation control, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The controller is designed with multi-functionality to perform both normal control operations and error compensation functions. It monitors torque values of multiple motors and can switch between normal operation mode and compensation mode, providing universal control capability without requiring separate dedicated control systems for each motor.
Solution Approach 2:
The controller continuously detects torque values of the drive motor, compressor motor, and water pump motor, and uses this feedback information to determine whether errors have occurred. Based on the feedback, the controller automatically adjusts the operation of motors to compensate for detected errors, maintaining system reliability through closed-loop control.
3Measurement precision
If torque values are continuously monitored and compared with reference values, then the measurement precision is improved, but the loss of time increases due to continuous detection requirements
Solution Approach 1:
The controller performs periodic detection of torque values at predetermined intervals rather than continuous monitoring. This periodic action allows the system to maintain adequate measurement precision for error detection while reducing the time loss associated with constant monitoring, achieving a balance between accuracy and efficiency.
Data Source
AI summary
An integrated control method of a motor for a vehicle includes detecting an output torque value of a drive motor and an output torque value of a ventilation system compressor motor by a controller when a vehicle start and a ventilation system are turned on, determining whether an error is occurred in the drive motor and the compressor motor as an output torque value of the drive motor and an output torque value of the ventilation system compressor motor are respectively compared with a drive motor torque reference value and a compressor motor torque reference value which are predetermined by the controller, and adjusting output torque values of the drive motor or the compressor motor depending on a result of determining whether an error is occurred in the drive motor and the compressor motor by the controller.