Feed-Forward Correction for Drive Control Precision
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Solution Overview
Problem
In two-degree-of-freedom system control, the increased feed-back compensation amount due to nonlinear elements and mechanical property differences between the control target model and the actual control target impairs followability and responsiveness, leading to deviations in reaching target trajectories.
Innovation Solution
A drive control apparatus that includes a feed-forward operation amount generation device, a feed-back operation amount generation device, a feed-forward correction amount generation device, and a feed-forward operation amount correction device, which minimizes errors between target and actual movement amounts by generating and correcting feed-forward operation amounts, thereby suppressing the increase in feed-back compensation and enhancing followability and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feed-back control is used to compensate for errors between target and actual movement amounts, then manufacturing precision is improved, but loss of time increases due to delayed response and impaired followability
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for various operation amounts before actual control execution. The correction value calculation unit computes correction values in advance based on the relationship between operation amounts and actual movement amounts, storing them in a lookup table. During real-time control, the system simply retrieves the pre-computed correction value corresponding to the current operation amount, avoiding time-consuming real-time calculations and enabling rapid compensation without delaying the control response.
2Productivity
If feed-forward control is used to enhance responsiveness, then productivity is improved, but manufacturing precision deteriorates due to increased feed-back compensation amounts
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual movement amount of the control target and comparing it with the target movement amount. Based on this comparison, the correction value calculation unit dynamically determines appropriate correction values to compensate for deviations. This feedback mechanism ensures that while feed-forward control maintains high responsiveness, any precision losses are automatically corrected through the lookup table-based compensation, thereby maintaining both speed and accuracy.
3Device complexity
If a simple feed-forward operation amount is used, then device complexity is reduced, but manufacturing precision deteriorates due to inability to handle nonlinear elements and mechanical property differences
Solution Approach 1:
The patent applies segmentation by dividing the control system into distinct functional modules: a correction value calculation unit that processes compensation data, a lookup table that stores pre-computed correction values, and a control target that executes the controlled operations. This modular segmentation allows the system to handle complex nonlinear relationships and mechanical property variations through dedicated correction mechanisms while keeping the overall control structure organized and manageable, thereby improving precision without excessive complexity.
Data Source
AI summary
A drive control apparatus including a feed-forward operation amount generation device, a feed-back operation amount generation device, a feed-forward correction amount generation device and a feed-forward operation amount correction device is provided. The drive control apparatus is configured to input an input operation amount, which is obtained by adding a feed-back operation amount to a feed-forward operation amount corrected by the feed-forward operation amount correction device, into a control target thereby to drive the control target.