Multi-Motor Torque Distribution Using Optimal Operating Points
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Solution Overview
Problem
In vehicles with multiple motors as a driving power source, efficiently controlling motor torque is challenging due to the complexity of torque distribution, which affects motor efficiency and overall vehicle performance.
Innovation Solution
A motor control system that determines request torque, optimal operating point torque, and target torque for each motor by distributing torque based on maximum limit torque and current rotation speed, using a torque distribution ratio to calibrate and adjust torques, ensuring efficient motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used as a driving power source, then the system structure is simple, but it is difficult to consider motor efficiency when adjusting torque
Solution Approach 1:
The patent divides the single motor system into multiple motor segments (first motor and second motor) that can operate independently. Each motor has its own torque control that considers individual efficiency characteristics, allowing the system to optimize energy usage by distributing torque to motors operating in their efficient ranges while maintaining relatively simple overall system architecture.
2Use of energy by moving object
If a plurality of motors are used as driving power sources, then motor efficiency can be optimized through torque distribution, but the control complexity increases
Solution Approach 1:
The patent changes the control parameters from direct torque commands to efficiency-based torque distribution ratios. The controller calculates optimal torque distribution by considering efficiency maps of each motor and dynamically adjusts the torque distribution ratio based on operating conditions (vehicle speed, acceleration requests), thereby optimizing motor efficiency while managing control complexity through parameter-based control strategies.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the actual operating points of motors against their efficiency maps. The controller adjusts torque distribution in real-time based on feedback from motor operating conditions, ensuring motors operate in high-efficiency regions while adapting to changing vehicle demands and environmental conditions.
3Device complexity
If torque is distributed without considering optimal operating points, then control is simple, but overall vehicle performance deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-establishing efficiency maps for each motor that define optimal operating regions. Before actual torque distribution occurs, the controller uses these pre-characterized efficiency maps to determine optimal torque allocation strategies, avoiding the need for complex real-time optimization calculations while ensuring motors operate in high-efficiency regions for improved vehicle performance.
Data Source
AI summary
A motor control system and a method thereof are provided for a vehicle having a plurality of motors as a driving power source. The system includes a request torque determination part that determines a request torque requested for the plurality of motors corresponding to a driver request torque. An optimal operating point torque determination part determines an optimal operating point torque for each of the plurality of motors according to a current rotation speed of each of the plurality of motors. An motor torque determination part then determines a target torque for each of the plurality of motors by distributing the request torque to the plurality of motors based on the optimal operating point torque.