Partial-Angle Position Transmission for Drive Systems
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Solution Overview
Problem
Existing methods for transmitting position values from angular-position sensors in drive systems are not robust against interference and do not efficiently manage data transmission, particularly in closed-loop control systems where safety and accuracy are critical.
Innovation Solution
A method that transmits a position value characterized by a partial-angle and fine-angle value, where the fine-angle value is sent first, allowing for early determination of a model value and subsequent comparison with the actual value, enabling timely safety actions and reducing data transmission bandwidth by restricting the value range, thus enhancing robustness and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the complete position value (first value and second value) is transmitted in each cycle, then the data transmission is complete and accurate, but the transmission time increases and safety actions are delayed
Solution Approach 1:
The position value is segmented into a first value (coarse position) and a second value (fine position). Only the second value is transmitted in each cycle, while the first value is determined through model calculation based on previously transmitted second values. This segmentation allows complete position information to be reconstructed without transmitting all data, reducing transmission time while maintaining accuracy.
Solution Approach 2:
The model value for the first value is determined in advance based on previously transmitted second values before the actual first value is needed for control actions. This preliminary determination allows the system to have the complete position information ready earlier, enabling timely safety actions without waiting for complete data transmission.
2Quantity of substance
If the value range is restricted for data transmission, then the bandwidth requirements are reduced, but the complete position information may be lost
Solution Approach 1:
The system uses feedback from previously transmitted second values to model and determine the first value. By continuously comparing newly detected second values with model values derived from previous transmissions, the system reconstructs complete position information without transmitting the full range of position data in each cycle, thus reducing bandwidth while preserving information completeness.
Solution Approach 2:
The transmission strategy changes from transmitting the complete position value (both first and second values) to transmitting only the second value (fine position) in each cycle. This parameter change in what is transmitted, combined with model-based reconstruction of the first value, reduces the quantity of transmitted data while maintaining complete position information through mathematical relationships between successive measurements.
Data Source
AI summary
In a method and device for the cyclic digital transmission of a position value of a moving object with inertial mass, the value range of the transmitted position value is restricted such that no complete rotation or, in the case of a linear motion, other complete period caused by mechanical conditions may be mapped, and the actual position is formed by detecting value-range exceedances in an evaluation unit.