Motor Efficiency Map Generation via Regenerative Torque Distribution
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Solution Overview
Problem
Existing techniques for generating efficiency maps for motors on electric vehicles are limited to pre-configured maps and do not allow for real-time generation or updating during operation, particularly when multiple motors are used for independent control of drive wheels, leading to difficulties in acquiring sufficient data for high torque regions.
Innovation Solution
An efficiency map generating apparatus and method that includes instructed torque detection, torque distribution, power consumption detection, and rotation count detection to generate efficiency maps based on torque, power consumption, and rotation counts, enabling regenerative torque generation and updating of efficiency maps during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple motors are used for independent control of drive wheels, then motor control flexibility and efficiency are improved, but difficulty in acquiring sufficient experimental data for high torque regions increases
Solution Approach 1:
The system performs self-measurement by using its own multiple motors to generate regenerative torque and measure efficiency characteristics during actual operation. The efficiency map generating apparatus utilizes the vehicle's own motor system to acquire measurement data, eliminating the need for external test equipment and enabling data collection in previously inaccessible high torque regions through regenerative braking operations.
2Loss of time
If efficiency maps are prepared in advance from experiment, then generation time is reduced, but the maps cannot be updated during actual running
Solution Approach 1:
The efficiency map is transformed from a static pre-prepared data structure to a dynamic, updateable map that changes during actual vehicle operation. The system continuously acquires measurement data during running and updates the efficiency map in real-time, allowing the map to adapt to actual operating conditions and improve accuracy over time while maintaining quick access through the structured map format.
3Quantity of substance
If regenerative torque is generated by causing any motor to generate regenerative torque, then efficiency map data in high torque region can be acquired, but control complexity increases
Solution Approach 1:
The motor system is designed to perform multiple functions: it can operate in both power generation mode and regenerative braking mode, and can serve as both the object being measured and the measurement tool. By utilizing the same motor to generate regenerative torque for measurement purposes, the system avoids adding separate measurement equipment while expanding data acquisition capabilities to high torque regions.
Data Source
AI summary
An efficiency map generating apparatus (100) generates an efficiency map of motors (M) connected to drive wheels of a mobile body and includes an instructed torque detecting unit (111) that detects an instructed torque input for the multiple motors (M), a torque distributing unit (112) that distributes torque to each of the multiple motors (M) based on the instructed torque, a power consumption detecting unit (113) that detects power consumption of the motors (M), a rotation count detecting unit (103) that detects the rotation counts of the motors (M), and an efficiency map generating unit (114) that generates a motor efficiency map (115) based on the torque in multiple combinations, the power consumption, and the rotation counts, where the torque distributing unit (112) causes any of the multiple motors (M) to generate regenerative torque.