EV Transmission Shift Torque Coordination Across Dual Motors
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Solution Overview
Problem
Electric vehicles face challenges in coordinating torque allocation between motors and transmissions to meet varying torque requirements at different axles, requiring effective control of multiple elements in the driveline to manage vehicle speed and torque output.
Innovation Solution
A method and system where a first motor processor coordinates torque commands between a first motor and its associated transmission, determines torque assistance from a second motor, and sends requests to adjust torque as needed to fulfill driver requests, speed control, active damping, and transmission control module requests, ensuring optimal torque distribution across the driveline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque is allocated between motor and transmission to meet varying torque requirements, then torque management efficiency is improved, but control complexity increases
Solution Approach 1:
The torque control system is segmented into multiple independent control modules: a vehicle motion control module for overall torque command generation, individual motor processors for each motor's torque control, and a transmission control module for transmission-specific torque management. This segmentation allows each module to handle specific aspects of torque allocation independently, improving overall torque management efficiency while distributing control complexity across modular components rather than a monolithic control system.
2Reliability
If torque assistance from second motor is coordinated when first motor reaches torque limit, then torque requirement fulfillment is improved, but inter-motor coordination complexity increases
Solution Approach 1:
The motor processor continuously monitors the torque output and operational status of the first motor. When the first motor reaches its torque limit or cannot fulfill a transmission control module request, the motor processor automatically determines the needed torque assistance from the second motor and sends a torque assistance request. This feedback mechanism ensures reliable torque requirement fulfillment by dynamically adjusting inter-motor torque distribution based on real-time motor performance, while the automated nature of the feedback loop minimizes the complexity of manual coordination.
Data Source
AI summary
A vehicle includes a control system that performs method of operating the vehicle. The control system includes a first motor processor associated with a first motor of the vehicle. The first motor processor receives a torque command from a vehicle motion control module, coordinates an allocation of the torque command into a first motor torque at the first motor and a transmission torque at a first transmission associated with the first motor, and controls the first motor to apply the torque command at the first motor.