Vehicle Motor Control via Dynamic Current Map Selection
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Solution Overview
Problem
Current motor control systems for environmentally-friendly vehicles face inefficiencies due to increased rotor inductance, which affects dynamic response performance and fuel consumption, especially when trying to minimize losses during maximum efficiency control.
Innovation Solution
A motor control apparatus and method that includes a data detector, vehicle controller, and motor controller, which determines request torque and speed, generates request acceleration, and selects an inductance control current map or motor efficiency control current map to optimize motor operation by minimizing rotor inductance based on acceleration, thereby improving responsiveness and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If maximum efficiency control is used to minimize loss, then fuel consumption is improved, but dynamic response performance deteriorates due to increased rotor inductance
Solution Approach 1:
The control system dynamically switches between two current maps (maximum efficiency control current map and maximum dynamic response control current map) based on driving conditions. The driving point determinator selects which current map to use, allowing the rotor inductance characteristics to be optimized for either efficiency or dynamic response depending on the situation, thus resolving the contradiction between fuel consumption and acceleration performance.
Solution Approach 2:
The system changes the electrical parameters (current and current phase angle) based on the selected current map. By adjusting these parameters according to whether maximum efficiency or maximum dynamic response is prioritized, the system can minimize losses during steady-state operation or improve acceleration performance during transient conditions.
2Adaptability or versatility
If field coil motor is used instead of permanent magnet motor, then rare earth metal usage is eliminated and driving area is widened, but rotor inductance increases affecting efficiency
Solution Approach 1:
The system optimizes the electrical parameters (current magnitude and phase angle) specifically for the field coil motor's inductance characteristics. By using pre-calculated current maps that account for the higher rotor inductance of field coil motors, the system recovers efficiency performance while maintaining the advantages of rare earth metal elimination and wider driving area.
Solution Approach 2:
The driving point determinator continuously monitors operating conditions and selects the appropriate current map to compensate for the field coil motor's inductance characteristics, ensuring optimal efficiency across different operating points despite the motor type selection.
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 solution enhances driving satisfaction and improves fuel consumption by optimizing motor control based on rotor inductance, leading to better acceleration performance and reduced fuel usage.
Implementation Method 1
By winding a coil to an iron core of each of a stator and a rotor and by applying a current thereto, the field coil motor generates a torque.
Data Source
AI summary
A motor control apparatus for a vehicle includes a data detector detecting driving data and a vehicle controller controlling a drive motor according to the driving data. The vehicle controller includes an acceleration generator determining a request torque and a request speed using the driving data and generating a request acceleration using the request torque and the request speed; a driving point determinator selecting an inductance control current map or a motor efficiency control current map according to the request acceleration and determining a current driving point according to the request torque and the request speed using the selected current map; and a motor controller controlling the drive motor using the current driving point.