Dual-Motor Torque Vectoring Control for High-Speed Steering
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Solution Overview
Problem
Existing torque vectoring systems in electrified vehicles face challenges in enhancing torque vectoring performance, particularly in high-speed ranges, without the need for additional control devices.
Innovation Solution
A motor driving apparatus and method that utilizes a first and second motor, each independently driving a wheel, with a controller adjusting torque commands and output limits for each motor to achieve different torques, enabling torque vectoring without separate devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If torque vectoring is implemented using separate control devices, then steering control performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the torque vectoring control function into the existing motor control system by integrating the torque vectoring controller with the motor controller. This combines multiple control functions (motor control and torque vectoring) into a single control unit, eliminating the need for separate control devices while maintaining steering control performance.
Solution Approach 2:
The motor controller is designed to perform multiple functions: both standard motor control and torque vectoring control. By making the controller universal and capable of handling different control tasks, the system achieves torque vectoring functionality without requiring dedicated separate control hardware.
2Ease of operation
If motor output limit is adjusted during torque vectoring, then torque vectoring performance in high-speed range is improved, but control complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of the motor output limit based on current operating conditions during torque vectoring operations. The output limit is not fixed but changes dynamically according to the vehicle state and torque vectoring requirements, allowing optimal performance across different speed ranges while using a unified control approach.
Solution Approach 2:
The control system changes the output limit parameter dynamically during torque vectoring control. By adjusting this key parameter based on operating conditions, the system achieves improved torque vectoring performance in high-speed ranges without requiring fundamentally different control strategies or additional complexity.
Data Source
AI summary
Disclosed herein is a motor driving apparatus, which includes a first motor and a second motor, each independently driving a left wheel and a right wheel of a vehicle, a first inverter unit driving the first motor and a second inverter unit driving the second motor, and a controller performing torque vectoring to drive the left wheel and the right wheel with different torques by adjusting a torque command for at least one of the first motor and the second motor, and a method for controlling the same.