Tandem Motor Shaft Torque Control via Feedback Resonance Suppression
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Solution Overview
Problem
Existing shaft torque control devices for tandem motor systems experience significant deviations between shaft torque command and detection signals, as well as torsional resonance issues due to the connection of dynamometers in series, which are not adequately addressed by existing designs.
Innovation Solution
A shaft torque control device that incorporates a feedback control system with a generalized plant model, using weighting functions to generate control inputs based on observed outputs, effectively suppressing shaft torque deviations and torsional resonance by equalizing torque loads between motors and adjusting control signals to match target proportions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two dynamometers are connected in series to generate great drive torque, then the drive torque capability is improved, but torsional resonance occurs in the shaft connecting the dynamometers
Solution Approach 1:
The patent implements a feedback control system that detects shaft torque between the dynamometers and generates control inputs to suppress torsional resonance. The system continuously monitors the shaft torque detection signal and adjusts the torque current command signals to the first and second motors to minimize oscillations caused by torsional resonance, thereby maintaining system stability while preserving the high drive torque capability of the series configuration.
2Stability of the object's composition
If a shaft torque control device is designed based on a generalized plant, then resonance suppression function is improved, but deviation between shaft torque command value and detection value occurs
Solution Approach 1:
The patent employs a feedback control system that uses the shaft torque detection signal to generate appropriate control inputs. The controller is designed to satisfy predetermined design conditions that balance resonance suppression with accurate torque control. The feedback mechanism continuously adjusts the torque current command signals based on the difference between command and detection values, thereby reducing deviation while maintaining resonance suppression capability.
3Reliability
If the controller applies control inputs based on observed outputs from the generalized plant, then both shaft torque deviation suppression and resonance suppression functions are achieved, but the device complexity increases
Solution Approach 1:
The patent designs a controller that performs multiple functions simultaneously: it suppresses shaft torque deviation, suppresses torsional resonance, and maintains accurate torque control. The generalized plant framework provides a unified control architecture that handles multiple control objectives through a single integrated controller, reducing the need for separate control systems and thereby limiting the increase in device complexity despite the enhanced functionality.
Data Source
AI summary
A shaft torque control device includes a feedback control system having: a generalized plant P including a nominal plant model N representing the input/output characteristic of a test system including a tandem dynamometer system; and a controller K for applying a first and second control inputs u1, u2 to the generalized plant P on the basis of a first observed output y1 and second observed output y2. The controller K has been designed using a computer so as to satisfy a prescribed design condition. For the generalized plant P, defined are: a first control amount output z1 resulting from weighting the first observed output y1 using a weighting function Ge(s); a second control amount output z2 resulting from weighting a front transmission torque t1 using a weighting function Gt1(s); and a third control amount output z3 resulting from weighting a rear transmission torque t2 using a weighting function Gt2(s).