Dynamo Control Device for Resonance Suppression in Dynamometer Systems
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Solution Overview
Problem
In dynamometer systems, existing control devices struggle to achieve a no-load state and reduce resonance phenomena when an engine with unknown inertia is connected, as they require prior identification of the engine's inertia and dynamometer properties, leading to lowered engine speed and significant torsion torque oscillations.
Innovation Solution
A dynamo control device that generates a torque current command signal by multiplying the difference between torque command and detection signals by specific gains and integrating the result, with a high-pass filter to reduce resonance, allowing for a no-load state and reduced torsion resonance without prior inertia identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If H∞ control and μ design method are applied to reduce resonance phenomenon, then resonance is reduced, but it requires prior identification of engine inertia and dynamometer properties which cannot be performed when engine is first installed
Solution Approach 1:
The control system automatically identifies engine inertia and dynamometer properties through self-testing procedures, eliminating the need for manual prior identification. The system performs autonomous parameter extraction during commissioning, allowing the engine to be started without pre-identified parameters.
Solution Approach 2:
The system performs preliminary parameter identification and system characterization before normal operation begins. Through pre-running tests and automatic identification routines, the necessary inertia and property parameters are determined in advance, enabling subsequent resonance reduction control to function effectively.
2Ease of operation
If dynamometer is connected to engine during start, then engine can be started, but engine speed is lowered and torsion resonance occurs when engine inertia is unknown
Solution Approach 1:
The control system continuously monitors engine speed, torque, and vibration signals during startup, using feedback to dynamically adjust dynamometer torque commands. This real-time feedback enables the system to compensate for unknown engine inertia and suppress torsion resonance while maintaining engine starting capability.
Solution Approach 2:
The system dynamically changes control parameters including torque commands, gain values, and filter characteristics during the startup process. By adapting parameters based on real-time system response, the control system optimizes engine speed while reducing torsion resonance even when engine inertia is initially unknown.
Data Source
AI summary
Provided is a dynamometer-system dynamo control device that can appropriately suppress the occurrence of resonance phenomena and can realize a no-load state, even in a case where an engine the inertia of which is unknown is connected. The dynamometer system comprises a dynamometer and a shaft torque meter. A dynamo control device 6 in the dynamometer system generates a torque current command signal on the basis of a torque detection signal and a torque command signal. The dynamo control device 6 comprises: a gain calculation unit 62 that multiplies the difference between the torque command signal and the torque detection signal by gain wATR and then by Ki; an integration operation unit 63 that integrates the output signal of the gain calculation unit 62; a high-pass filter 64 characterized by a response frequency wHPF; and a torque current command signal generation unit 65 that generates a torque current command signal by superimposing, onto the output signal of the integration operation unit 63, an output signal obtained by inputting the torque detection signal to the high-pass filter 64.