Swashplate Axial Piston Machine Predictive Control
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Solution Overview
Problem
Existing axial piston machines of swashplate design face challenges in accurately regulating pivot angle, rotational speed, and pressure due to parameter variations and disturbances, requiring improved control mechanisms for efficient operation.
Innovation Solution
A method utilizing a computing unit and an electro-proportional valve with a mechanical spring return, where a model-based regulator calculates future profiles of controlled variables, incorporating geometric dimensions and operating variables to set actuation variables, and an optimization calculation to minimize deviations, with optional electronic pivot angle regulators for enhanced control behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If model-based predictive control with optimization calculation is implemented, then control precision and robustness against disturbances are improved, but device complexity and computational requirements increase
Solution Approach 1:
The control system performs predictive calculations to determine future states of the axial piston machine based on current operating parameters and intended values. The model-based regulator calculates a future profile of the controlled variable over a prediction horizon, allowing the system to anticipate and compensate for deviations before they occur, thereby improving control precision without requiring complex real-time intervention mechanisms
Solution Approach 2:
The optimization calculation continuously compares the predicted future profile with the intended value and adjusts the manipulated variable to minimize deviations. This closed-loop feedback mechanism, combined with the predictive model, enables the system to maintain high control precision while managing complexity through systematic calculation rather than complex hardware
2Speed
If electro-proportional valve with mechanical spring return is used, then adjustment speed is improved, but control precision under varying parameters deteriorates
Solution Approach 1:
The model-based regulator explicitly accounts for parameter variations by incorporating them into the predictive model. The system calculates the future profile based on current parameter values and adjusts the manipulated variable to compensate for expected deviations, thereby maintaining control precision despite changes in operating conditions such as viscosity variations, temperature changes, or load fluctuations
Solution Approach 2:
By calculating the future profile over a prediction horizon, the system anticipates the effects of parameter variations before they significantly impact performance. This allows the electro-proportional valve to be actuated in advance with appropriate corrections, maintaining both high adjustment speed and robustness against parameter changes
3Reliability
If cascade structure with electronic regulator superposed on electro-proportional adjustment is implemented, then robustness over disturbances is improved, but device complexity increases
Solution Approach 1:
The model-based regulator integrates the functions of both the electronic regulator and the electro-proportional adjustment into a unified control approach. By combining the predictive model with the optimization calculation, the system achieves the disturbance rejection capabilities of a cascade structure while avoiding the need for separate, complex control loops, thereby reducing overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise tracking of intended values for pivot angle, rotational speed, and pressure, improving dynamic control behavior and robustness against disturbances, facilitating high adjustment speed and efficient operation.
Implementation Method 1
a hydraulic adjustment cylinder which is settable by means of an electromagnetic, in particular an electro-proportional valve
Data Source
AI summary
A method for operating an axial piston machine of swashplate design, in which a swashplate is settable by means of an adjustment device, and in which a controlled variable of the axial piston machine is regulated by predetermining a manipulated variable. Under the assumption of a constant intended value of the controlled variable, a future profile of the controlled variable is ascertained using a model of the axial piston machine in which respective current values of at least one operating variable of the axial piston machine, which comprises the controlled variable, and a current value of the manipulated variable are taken into account. A value to be set for the manipulated variable is ascertained and set taking into account the future profile of the controlled variable.