Hydraulic Flow Prioritization Under Pump Undersupply
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Solution Overview
Problem
Existing hydraulic control arrangements fail to prioritize the supply of hydraulic pressure medium to certain consumers over others during undersupply conditions, leading to reduced pressure medium delivery to all consumers independently of their load pressure.
Innovation Solution
The control signals for metering orifices are adjusted to change the ratios of their flow cross-sections in favor of preferred consumers, allowing them to receive a predetermined amount of pressure medium while subordinate consumers receive a minimum, even if it means reducing the flow cross-sections of other orifices to ensure priority delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hydraulic pump delivers the sum of individual pressure medium quantities based on flow cross sections of metering orifices, then the demand current control is achieved, but in the event of undersupply, only the hydraulic consumer with the highest load pressure receives less pressure medium than desired
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different hydraulic consumers. The control device differentiates between preferred and non-preferred consumers, applying different flow distribution strategies to each group. Preferred consumers receive priority flow allocation during undersupply conditions, while non-preferred consumers have their flow reduced first.
Solution Approach 2:
The control device changes the flow distribution parameters dynamically based on supply conditions. When undersupply is detected, the control device modifies the flow cross-section ratios of metering orifices to favor preferred consumers, changing the parameter ratios from equal distribution to priority-based distribution.
2Productivity
If the sum of individual pressure medium quantities exceeds the maximum delivery rate of the hydraulic pump, then undersupply occurs, but the existing control arrangements reduce pressure medium delivery to all consumers independently of their load pressure
Solution Approach 1:
The patent implements local quality by creating differentiated supply zones within the hydraulic system. Preferred hydraulic consumers are assigned to a priority supply zone with guaranteed flow allocation, while non-preferred consumers are assigned to a secondary supply zone. This spatial differentiation in the control logic ensures that during undersupply, the priority zone maintains reliable supply while the secondary zone accepts reduced flow.
3Manufacturing precision
If the flow cross sections of metering orifices are controlled to match the ratios of individual amounts of pressure medium, then the flow distribution is proportional, but during undersupply this proportionality prevents priority supply to critical consumers
Solution Approach 1:
The patent applies dynamics by making the flow distribution strategy adaptive rather than static. The control device continuously monitors the total demand against the pump's maximum delivery rate and dynamically switches between two operational modes: proportional distribution mode (when supply is sufficient) and priority-based distribution mode (when undersupply occurs). This dynamic adaptation allows the system to maintain precision under normal conditions while ensuring reliability during critical undersupply situations.
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 solution ensures that preferred hydraulic consumers receive their specified amount of pressure medium during undersupply, while subordinate consumers still receive a minimum, maintaining system stability and ensuring that the preferred consumers are prioritized effectively.
Implementation Method 1
which can be acted upon by the pressure downstream of the respective metering orifice in the opening direction and by the highest load pressure or a pressure derived therefrom in the closing direction
Implementation Method 2
a hydraulic pump with an adjustable stroke volume... from which the hydraulic pump can be controlled in such a way that it promotes the sum of the individual amounts of pressure medium
Implementation Method 3
each of which has a metering orifice... the flow cross-sections of which center to each other in the same proportions as the individual amounts of pressure medium
Data Source
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AI summary
The invention relates to a hydraulic control arrangement with which at least two hydraulic consumers can be supplied simultaneously with predefinable individual quantities of hydraulic fluid and which comprises a hydraulic pump with adjustable stroke volume, at least two valve arrangements, each of which includes a metering orifice and a pressure balance arranged downstream of the metering orifice, which can be acted upon by the pressure downstream of the respective metering orifice in the opening direction and by the highest load pressure or a pressure derived therefrom in the closing direction, and of which each of which is arranged between a pump line leading from the hydraulic pump and a consumer, and with an electronic control unit by which the hydraulic pump can be controlled such that it delivers the sum of the individual quantities of hydraulic fluid, and by which the metering orifices can be controlled with control signals when the hydraulic pump delivers sufficient quantity of hydraulic fluid.that their flow cross-sections are in the same ratio to each other as the individual pressure medium quantities. With such a hydraulic control arrangement, a variable prioritization of consumers is possible by the fact that, when several metering orifices are controlled simultaneously and the hydraulic pump's delivery rate is insufficient, the simultaneously controlled metering orifices can be controlled with control signals in favor of a consumer that is preferably supplied with pressure medium, the ratios of which differ from the ratios of the individual pressure medium quantities.