Predictive Hydraulic Pressure Control for Faster Mobile Machine Response
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Solution Overview
Problem
Existing hydraulic supply systems, particularly in agricultural machines, face inefficiencies due to high reaction times in adjusting pump supply pressure in response to increased consumer load sensing pressure, which can be attributed to the reliance on hydraulic and electronic load sensing systems that depend on cycle times and component performance.
Innovation Solution
A control system that incorporates predictive mode operation, where controllers receive data on operational parameters and pressure signals to pre-emptively adjust pump supply pressure based on predicted hydraulic demands, reducing the need for immediate load sensing adjustments and enhancing dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If load sensing systems are used to adjust pump supply pressure in response to consumer demand, then system efficiency is improved, but reaction time increases due to dependency on cycle times and component performance
Solution Approach 1:
The control system predictively increases pump supply pressure in advance when increased hydraulic demand is anticipated, rather than waiting for the load sensing pressure to trigger adjustment. This preliminary action reduces reaction time while maintaining system efficiency by reverting to load sensing mode when demand decreases.
2Speed
If pump supply pressure is continuously maintained at high levels to meet peak demand, then dynamic response is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts pump supply pressure based on real-time operational conditions and predictive algorithms. Pressure is increased only when and where needed to meet anticipated demand, rather than maintaining continuously high pressure levels, thereby improving dynamic response while reducing unnecessary energy consumption.
Solution Approach 2:
The control system changes the pump supply pressure parameter selectively and temporarily based on predicted hydraulic demand. Pressure levels are adjusted upward only during periods of anticipated high demand and returned to baseline levels otherwise, optimizing the balance between dynamic response and energy consumption.
3Loss of time
If predictive mode operation is implemented to reduce reaction time, then dynamic performance is enhanced, but control system complexity increases
Solution Approach 1:
The control system uses an intermediary predictive algorithm that processes operational parameters and triggers pressure adjustment only when specific conditions are met. This intermediary layer reduces the need for continuous complex monitoring while still achieving reduced reaction time through targeted predictive actions.
Data Source
AI summary
A system for controlling a hydraulic supply on a mobile machine comprises electronic load sensing and is configured to predictively increase the pump supply pressure PSP following a determination that a hydraulic consumer is about to be actuated. The pump supply is increased irrespective of the reported hydraulic load at the time to meet a predicted hydraulic demand of consumer. The control system may revert to a load-sensing-based control of the pump supply after a given time period or in dependence on a predefined operational parameter being met. A corresponding method of controlling a hydraulic system on a mobile machine is also disclosed.