Dynamometer Torque Control With Loss Compensation and Vibration Suppression
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Solution Overview
Problem
Dynamometer systems face increased mechanical loss and reduced accuracy when auxiliary loads are connected, leading to errors between actual and modeled systems due to changes in load configuration, which affects control responsiveness and measurement precision.
Innovation Solution
A control device for dynamometer systems that includes a loss computation unit generating a loss compensation signal based on angular velocity detection, combined with a natural vibration suppression control circuit to adjust torque commands and compensate for mechanical losses, ensuring stable and accurate control even with changing load configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auxiliary loads are connected to the dynamometer output shaft, then the functionality and versatility of the system is improved, but the mechanical loss increases and measurement precision deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring the angular velocity of the output shaft and using this information to dynamically compute and adjust the mechanical loss compensation signal. The natural vibration suppression control circuit uses feedback from the torque sensor and angular velocity sensor to generate correction signals that compensate for mechanical losses and suppress vibrations, thereby maintaining measurement precision despite varying load configurations.
Solution Approach 2:
The patent dynamically adjusts control parameters based on operating conditions. The mechanical loss compensation signal is computed as a function of angular velocity, and the natural vibration suppression control circuit adapts its correction signals based on real-time torque and speed measurements. This parameter adaptation allows the system to maintain accuracy across different load configurations and operating ranges.
2Adaptability or versatility
If auxiliary loads are connected to the dynamometer, then the system functionality is improved, but control responsiveness deteriorates due to increased mechanical loss
Solution Approach 1:
The patent applies preliminary action by pre-computing and applying mechanical loss compensation signals based on anticipated operating conditions. The loss computation unit generates compensation signals in advance based on angular velocity measurements, and the natural vibration suppression control circuit prepares correction signals before vibrations occur, thereby maintaining control responsiveness even with auxiliary loads connected.
3Stability of the object's composition
If a normative model is used to suppress natural vibration, then control stability is improved, but accuracy deteriorates when load configuration changes due to mechanical loss variations
Solution Approach 1:
The patent transitions from a static normative model to a dynamic adaptive control system. The mechanical loss compensation signal is dynamically computed based on real-time angular velocity measurements, and the natural vibration suppression control circuit continuously adapts its correction signals based on current operating conditions. This dynamic approach maintains both control stability and measurement accuracy across varying load configurations.
Data Source
AI summary
A control device of a dynamometer system includes a mechanical loss arithmetic unit that generates a loss compensation signal corresponding to loss torque generated in a dynamometer body in a state where a load is connected, on the basis of an angular velocity detection signal, a characteristic vibration suppression control circuit that generates a compensation signal in order to suppress a characteristic vibration of a swinging element, and a torque current command signal generating unit that generates a torque current command signal by subtracting the compensation signal from an upper level torque command signal. The characteristic vibration suppression control circuit is provided with a normative model arithmetic unit, deviation compensator, model input generating unit, and differential compensator that generates a correction signal by subjecting a torque signal obtained by the normative model arithmetic unit to a differential operation.