Hydraulic Characteristic Curve Adaptation for Precise Motion Control

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Solution Overview

Problem

Existing characteristic curves provided by hydraulic component manufacturers are insufficient as they do not account for design-related flow forces, friction effects, and other time-dependent influences, making precise control of hydraulic movements challenging, especially in mobile working machines.

Innovation Solution

A method for determining and adapting the characteristic curve of hydraulic components by measuring volume flow and pressure drop to calculate a replacement parameter, which is used to adjust the characteristic curve online, incorporating system parameters and environmental influences, ensuring precise control behavior throughout the machine's life cycle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If manufacturer-provided characteristic curves are used, then device complexity is reduced, but measurement precision and control accuracy deteriorate due to unaccounted system influences

Engineering Contradiction:

Improvecomplexity of control systemVSAvoidprecision of hydraulic control

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system continuously measures actual volume flow and pressure drop, then uses this feedback to update the characteristic curve in real-time, ensuring accuracy while maintaining simple control architecture

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The control unit automatically determines and adapts the characteristic curve using measured data without requiring external calibration or complex pre-programming, making the system self-calibrating

Inventive Principle:

Principle #25Self-service

2Ease of operation

If manufacturer characteristic curves are used, then ease of operation is improved, but adaptability deteriorates due to inability to account for wear and time-dependent influences

Engineering Contradiction:

Improveease of control setupVSAvoidadaptability to component wear

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The characteristic curve is transformed from a static manufacturer-provided curve to a dynamic curve that automatically adapts to changing component conditions through continuous measurement and online updating

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs self-adaptation by automatically detecting component wear and updating the characteristic curve without requiring manual intervention or recalibration

Inventive Principle:

Principle #25Self-service

3Measurement precision

If online determination and adaptation of characteristic curves is implemented, then measurement precision and control accuracy are improved, but device complexity increases due to additional measurements and calculations

Engineering Contradiction:

Improveprecision of hydraulic controlVSAvoidcomplexity of measurement system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Existing sensors in the hydraulic system are made multi-functional by using them both for their primary purposes and for determining volume flow and pressure drop characteristics

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Complex mechanical calibration systems are replaced with electronic measurement and calculation methods, using the control unit's processing capability to determine characteristic curves

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Adaptability or versatility

If online adaptation is implemented, then adaptability over machine life cycle is improved, but loss of time for data processing and calculation increases

Engineering Contradiction:

Improveadaptability over life cycleVSAvoidtime for characteristic curve adaptation

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The characteristic curve adaptation is performed continuously in the background during normal operation rather than requiring separate calibration periods, ensuring uninterrupted system functionality

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS20240392538A1Method for determining or adapting a characteristic curve of a hydraulic component or mobile working machine

Publication Date: 2024.11.28 LEIBHERR HYDRAULIKBAGGER GMBH

AI summary

The present disclosure relates to a method for determining or adapting a characteristic curve of a hydraulic component or mobile working machine having the following steps:determining a volume flow;determining a pressure drop;determining a replacement parameter of the component from the volume flow and the pressure drop;determining or adapting the characteristic curve using the replacement parameter.