Electric Motor Torque Control for Torsional Vibration Limits
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Solution Overview
Problem
Existing electric motor control methods fail to sufficiently suppress torsional vibration of driving transmission systems when the vibration damping function is limited, leading to discomfort for occupants due to unresolved abnormal noise and torque fluctuations.
Innovation Solution
An electric motor control method that calculates a second torque command value by correcting a first torque command value with a vibration compensation torque, limits this compensation torque based on a limit request suggesting amount, determines a limit level for the compensation torque, and adjusts feedback gains to optimize torque control, ensuring effective vibration suppression even when the damping function is limited.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the vibration compensation torque is limited, then gear abnormal noise is reduced, but control stability deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the feedback gain parameter based on operating conditions. Instead of using a fixed limit for vibration compensation torque, the system dynamically modifies the feedback gain to maintain control stability while allowing appropriate vibration suppression, thus resolving the contradiction between noise reduction and stability maintenance.
Data Source
AI summary
Provided is an electric motor control method includes: calculating a second torque command value by correcting the first torque command value by a vibration compensation torque for suppressing vibration in an electric motor rotation speed; limiting the vibration compensation torque based on a limit request suggesting amount suggesting a situation in which suppression of vibration in the electric motor rotation speed is to be limited; determining a limit level representing a degree of limit on the vibration compensation torque; and calculating a voltage command value by feeding back a torque suggesting amount suggesting an electric motor torque to the second torque command value. In the torque control step, a feedback gain of the torque suggesting amount is determined with reference to the limit level.