Axial Piston Pump Control Modeling for Safe Operating Range Expansion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The operating behavior of axial piston pumps is not clearly defined, leading to uncertainty about safe and unsafe operating points due to series fluctuations within production tolerances, which can result in errors or damage.
Innovation Solution
A method is developed to ascertain control model parameters using a control model and a safety model, where safe operating points are gradually expanded by selecting further operating points that maximize variance while ensuring a high probability of error-free operation, utilizing regression models and physical simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operating range of the axial piston pump is expanded to explore more operating points, then the productivity and adaptability are improved, but the risk of errors and damage increases due to uncertainty about safe operating points
Solution Approach 1:
The method performs preliminary characterization of the axial piston pump's operating behavior during the manufacturing process, before actual operation. By pre-determining safe operating points through controlled exploration and characterization, the system establishes a known safe operating range in advance, allowing later expansion into uncertain regions with controlled risk assessment
Solution Approach 2:
The method implements a feedback mechanism where operating points are systematically explored and characterized, with results fed back to update the control model. The control model continuously adapts based on measured operating behavior, allowing the safe operating range to be progressively expanded as more information becomes available about the specific pump's characteristics
2Measurement precision
If physical simulations and model-based approaches are used to characterize operating behavior, then the measurement precision and reliability are improved, but the device complexity and measurement difficulty increase
Solution Approach 1:
The method introduces a control model as an intermediary between the physical pump and the characterization process. The control model serves as a mathematical representation that simplifies the complex physical relationships, allowing operating behavior to be characterized through model-based calculations rather than direct complex measurements
Solution Approach 2:
The method creates a virtual copy of the axial piston pump through the control model, which replicates the pump's operating behavior mathematically. This virtual model allows for safe exploration and characterization of operating points without requiring physical experimentation on the actual pump, reducing measurement complexity while maintaining precision
Data Source
AI summary
A method is for ascertaining control model parameters of a control model of an axial piston pump. The method models at least one control variable of an adjustment unit of the axial piston pump as a function of operating variables. Operating points of the axial piston pump each are characterized by operating values of the operating variables. The method includes (i) providing initial control model parameters of the control model and an operating state set including a plurality of initial first operating points, (ii) providing initial safety model parameters of a safety model based on a safety set including a plurality of initial second operating points and associated safety values, and (iii) determining a further operating point which is not yet included in the operating state set. The further operating point is determined such that a variance of the control model is maximized.