Hybrid Motor Control Using Optimal Approximation Model
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Solution Overview
Problem
Conventional motor control systems for hybrid vehicles are costly and unreliable due to the need for multiple maps at different temperatures and the secondary correction by inverter voltage, which affects voltage usage efficiency and control reliability.
Innovation Solution
A system that selects an optimal approximation model based on driving conditions to determine current orders for motor control, using a current order generator, current controller, coordinate transformer, signal generator, PWM inverter, and resolver to generate and apply 3-phase currents, with a compensation value determination module that calculates compensation values using an optimal approximation model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple maps are created at different reference temperatures for current compensation, then control reliability is improved, but development cost and time increase significantly
Solution Approach 1:
The patent merges multiple temperature-specific maps into a single comprehensive map that simultaneously accounts for both temperature and inverter voltage effects. Instead of maintaining separate maps for different reference temperatures, the invention creates one unified map that compensates for operating current based on both temperature and voltage conditions, thereby reducing development complexity while maintaining control reliability
Solution Approach 2:
The single comprehensive map serves multiple functions that previously required separate maps: it compensates for both temperature variations and inverter voltage effects on operating current. This universal map can handle all operating conditions without requiring multiple specialized maps, reducing the overall system complexity while preserving reliability across different scenarios
2Use of energy by moving object
If inverter voltage is used for secondary correction of operating current, then voltage usage efficiency is improved, but control reliability deteriorates due to load condition variations
Solution Approach 1:
The patent introduces a comprehensive compensation map as an intermediary that mediates between temperature and inverter voltage effects. Instead of directly applying voltage-based correction that varies with load conditions, the map serves as a mediator that provides consistent compensation values based on both temperature and voltage inputs, ensuring reliable control while maintaining voltage usage efficiency across different load conditions
3Device complexity
If a single optimal approximation model is used instead of multiple maps, then development cost and time are reduced, but control accuracy may be compromised
Solution Approach 1:
The patent transforms the control approach by changing parameters from multiple discrete maps to a single comprehensive map with continuous parameters for temperature and inverter voltage. This parameter change allows the system to maintain high control precision through accurate interpolation and compensation calculations while significantly reducing development complexity by eliminating the need to create and maintain multiple separate maps
Data Source
AI summary
A system for controlling a motor of a hybrid vehicle that secures robustness and stability of control by selecting an optimal approximation model according to a driving condition of the motor and determines current order for controlling the motor by using the selected optimal approximation model is disclosed. In particular, a current order generator utilizes a reference current determination module to determine reference currents of the first and second axes, a compensation value determination module to determine compensation values of the reference currents of the first and second axes, and a current determination module to determine the currents of the first and second axes from the reference currents of the first and second axes and the compensation values of the reference currents of the first and second axes in order to control the motor more efficiently.