Sensor Transmission Timing Correction for Oscillator Drift
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Solution Overview
Problem
Current data transmission methods, such as the PSI5 standard, face challenges in maintaining error-free communication due to oscillator clock deviations in sensor units, particularly in higher communication modes like 16-bit mode at 189k, which can lead to data collisions and instability.
Innovation Solution
A method and device that correct transmission parameters by generating a sensor clock signal and comparing it with a reference clock signal to calculate a correction factor, adjusting transmission parameters like start time and bit width gradually using a slow controller, ensuring stable data transmission even with oscillator clock deviations up to ±10%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher communication modes like 16-bit mode at 189k are used, then data transmission speed is improved, but data collisions and transmission stability deteriorate due to oscillator clock deviations
Solution Approach 1:
The patent dynamically adjusts transmission parameters (bit width, number of slots, synchronization timing) based on the actual oscillator deviation detected during operation. This allows the system to adapt to clock variations and maintain reliable transmission at higher speeds by optimizing parameters in real-time rather than using fixed settings.
Solution Approach 2:
The system implements a feedback mechanism where the actual transmission performance and oscillator deviation are monitored, and this information is used to adjust transmission parameters dynamically. This closed-loop control enables the system to maintain stability at higher communication speeds by continuously adapting to detected variations.
2Reliability
If transmission parameters are adjusted to accommodate oscillator deviations, then transmission reliability is improved, but system complexity increases due to correction mechanisms
Solution Approach 1:
The sensor unit autonomously detects its own oscillator deviation and automatically adjusts its transmission parameters without external intervention. This self-correction mechanism simplifies the overall system architecture by eliminating the need for complex external calibration systems while maintaining high transmission reliability.
Solution Approach 2:
The system performs preliminary detection of oscillator deviation during initialization and before actual data transmission. This allows transmission parameters to be pre-adjusted based on detected variations, ensuring reliable transmission from the start without requiring complex real-time correction mechanisms during operation.
3Stability of the object's composition
If gradual adjustment using slow controller is used, then transmission stability is improved, but adaptation time increases
Solution Approach 1:
The system performs preliminary oscillator characterization during initialization to determine the magnitude of deviation. Based on this preliminary information, it selects an appropriate adjustment speed, allowing faster initial adaptation followed by gradual fine-tuning. This approach reduces overall adaptation time while maintaining stability during the gradual adjustment phase.
Data Source
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AI summary
The invention relates to a method for correcting at least one transmission parameter for data transmission between a sensor unit (10) and a control unit, wherein a sensor timing signal (STS) is generated by a sensor oscillator (14) with a predetermined period, wherein the at least one transmission parameter is determined on the basis of the sensor timing signal (STS), and wherein a reference timing signal (RTS) is generated by a reference oscillator with a predefined reference period, and to a device (20) for executing the method. The sensor timing signal (STS) is here compared with the reference timing signal (RTS), wherein a deviation of the current period of the sensor timing signal (STS) from a reference period is determined on the basis of the comparison, and wherein the at least one transmission parameter is corrected on the basis of the deviation determined.