Adaptive Torque Control Map for Hydrostatic Transmission
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Solution Overview
Problem
Existing hydrostatic torque controlling transmission systems face inaccuracies in torque control due to component wear and system tolerances, leading to discrepancies between expected and actual operation, resulting in inefficiencies and operator discomfort.
Innovation Solution
A method that progressively refines the torque control map by measuring actual output torque against expected torque, applying corrections to the map when errors exceed a threshold, and using these corrections to identify potential system faults, thereby ensuring accurate torque control and fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a calibration torque control map is used to link input pressure to output torque, then torque control is established, but inaccuracies arise due to component wear and system tolerances causing discrepancy between expected and actual operation
Solution Approach 1:
The system performs preliminary calibration to create an initial torque control map before operation. This pre-established map provides the foundation for torque control, acknowledging that some inaccuracies will exist due to manufacturing tolerances but will be refined through subsequent adaptive learning during system operation.
Solution Approach 2:
The system continuously monitors the discrepancy between expected torque (from control map) and actual torque (from sensors) and uses this feedback to progressively refine and update the torque control map. This closed-loop feedback mechanism corrects inaccuracies caused by component wear and manufacturing tolerances over time.
2Measurement precision
If the torque control map is progressively modified during operation, then accuracy improves, but system complexity increases due to additional monitoring and adjustment mechanisms
Solution Approach 1:
The control system performs self-calibration and self-correction by automatically monitoring torque discrepancies and updating its own control map without requiring external intervention. The system serves itself by detecting errors and adjusting its parameters, reducing the need for manual recalibration while improving accuracy over time.
3Reliability
If map values are replaced with modified values when error conditions are met, then torque control accuracy is improved, but additional processing time is required for error evaluation and map updates
Solution Approach 1:
The system applies partial corrections to the torque control map by only modifying entries where error thresholds are exceeded, rather than recalibrating the entire map. This selective update approach reduces processing time while still improving accuracy in the most critical areas where discrepancies are most significant.
Data Source
AI summary
A variator torque control system and method utilize a hydraulic actuator to control the variator output via a torque control map, wherein the values of the torque control map are evaluated and modified during use of the map to improve map accuracy. In an example, errors in the map are evaluated to determine whether a system fault has occurred.