Hydraulic Control Assembly Flow-Sensing Pump Regulation
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Solution Overview
Problem
Existing hydraulic control arrangements, such as load-sensing (LS) and Load-Unload Decoupling Variable (LUDV) controls, are complex, space-intensive, and costly, requiring significant device technology and energy due to the need for LS signaling lines and shuttle valve cascades to maintain pressure differences across metering orifices, especially under temperature changes and flow resistances.
Innovation Solution
A hydraulic control arrangement that uses a flow-sensing (FS) fluid flow path with detection orifices to control the fluid flow from a hydraulic pump to metering orifices, allowing the control device to adjust the pump's output based on the openness of the FS fluid flow path, eliminating the need for LS signaling lines and shuttle valve cascades, and incorporating individual pressure compensators to maintain constant pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If load-sensing control with LS signaling lines and shuttle valve cascade is used, then pressure difference control is achieved, but device complexity and installation space increase
Solution Approach 1:
The patent extracts and eliminates the complex LS signaling lines and shuttle valve cascade from the hydraulic control system. Instead of using traditional pressure-based signaling, the invention directly senses flow conditions at the metering orifices and controls the pump accordingly, removing unnecessary intermediate components while maintaining pressure difference control functionality
Solution Approach 2:
The control device is designed to perform multiple functions: it senses flow conditions through detection orifices, determines pump pressure requirements, and controls the variable displacement pump all in one integrated unit. This multi-functionality eliminates the need for separate LS signaling lines and shuttle valves, reducing device complexity while maintaining effective pressure control
2Stress or pressure
If load-sensing control with increased control pressure drop is provided, then sufficient pressure difference at metering orifices is maintained, but energy consumption increases
Solution Approach 1:
The invention dynamically adjusts the pump pressure based on actual flow demands detected by the detection orifices. The control device continuously monitors flow conditions and modulates the variable displacement pump to maintain only the necessary pressure difference at metering orifices, avoiding the continuous high pressure drop required by traditional LS controls. This dynamic adaptation reduces energy consumption while ensuring sufficient pressure difference when needed
Solution Approach 2:
The detection orifices provide continuous feedback on flow conditions to the control device, which then adjusts pump pressure accordingly. This feedback mechanism ensures that pressure is maintained at metering orifices only when and to the extent required by actual consumer demands, eliminating the need for excessive control pressure drop and reducing energy losses
3Stress or pressure
If traditional LS control components are used, then pressure control is achieved, but installation space and cost increase
Solution Approach 1:
The invention merges the functions of LS signaling lines, shuttle valves, and pump control into a single integrated control device. The detection orifices, control logic, and pump control mechanisms are combined in one compact unit, eliminating the need for separate LS control components and significantly reducing installation space while maintaining effective pressure control
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 reduces device complexity, installation space, and energy losses, providing a cost-effective and efficient control mechanism that adapts to fluid flow demands without excess pressure, ensuring stable fluid supply to consumers.
Implementation Method 1
Jede Detektionsblende (70) ist derart ausgebildet, dass sie den FS-Fluidströmungspfad (32) sperrt bzw. schließt, wenn der Druckunterschied über einer jeweiligen Zumessblende (10) (Versorgungsmangel) unter einen bestimmten Wert fällt
Implementation Method 2
Einzelndruckwaagen, die downstream der Zumessblenden (10) angeordnet sind und den Fluidstrøm zwischen den Zumessblenden (10) und einem Verbraucher so drosseln, dass der Druck nach allen Zumessblenden (10) gleich ist
Data Source
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AI summary
A hydraulic control arrangement for a plurality of consumers (38) is disclosed. For each consumer, a metering orifice (10) is provided to control a fluid flow. A detection orifice (12, 70) is assigned to each metering orifice. The detection orifices are arranged fluidically in series. A flow-sensing (FS) fluid flow path (32) extends across the detection orifices. Upstream of the detection orifices, the fluid flow path is connected to a hydraulic pump (40), and downstream of the detection orifices, to a control device (42) of the hydraulic pump. If a consumer is undersupplied with hydraulic fluid, the corresponding detection orifice closes the flow-sensing fluid flow path. The control device interacts with this FS fluid flow path in such a way that the fluid flow from the hydraulic pump is thereby increased.If none of the consumers are undersupplied, the FS fluid flow path is fully open via the detection orifices and the control device reduces the fluid flow from the hydraulic pump.