Wheeled Loader Hydraulic Control Block for Pulling Load Efficiency
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Solution Overview
Problem
Wheeled loaders with open hydraulic circuits face significant energy expenditure and losses due to varying load pressures, as pumps must generate the highest pressure to serve all consumers, leading to inefficient energy use and movement control.
Innovation Solution
The design incorporates a control block with fewer fine control notches on the inflow edge and more on the outflow edge, allowing the outflow control edge to restrict outflow during pulling loads, while an electrically adjustable pressure regulator maintains minimum pressure, enabling efficient hydraulic medium control and allocation without electrical specification, and combining main and secondary consumer control circuits to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pump operates in an open hydraulic circuit to serve multiple consumers, then all consumers can be supplied with hydraulic medium, but energy losses occur due to varying load pressures as the pump must generate the highest pressure for all consumers
Solution Approach 1:
The hydraulic circuit is segmented into multiple independent closed circuits, each with its own pump and control block. This allows each consumer to receive hydraulic medium at its required pressure independently, eliminating energy losses from pressurizing all consumers to the highest pressure level.
Solution Approach 2:
The system dynamically allocates piston groups to different consumers based on demand. The variable allocation allows the system to adapt to changing load conditions and supply the required oil amount at the individually associated pressure for every consumer, optimizing energy efficiency.
2Ease of operation
If hydraulic regulation is used to control consumer movement, then precise control is achieved, but substantial energy expenditure is required for regulation
Solution Approach 1:
The system replaces complex hydraulic regulation mechanisms with a simpler allocation control system. By using variable allocation of piston groups and direct pump control, the system achieves precise movement control without the substantial energy expenditure required by traditional hydraulic regulation.
3Ease of operation
If the outflow control edge has fine control notches for precise flow restriction, then outflow can be controlled during pulling loads, but the inflow control edge should remain simple for efficient medium allocation
Solution Approach 1:
The control block is designed with asymmetric control edges: the outflow control edge features fine control notches for precise flow restriction during pulling loads, while the inflow control edge remains simple without notches for efficient medium allocation. This local differentiation optimizes both control precision and system efficiency.
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 energy losses and enhances energy efficiency by allowing precise control of hydraulic medium flow, maintaining sufficient pressure for all consumers, and eliminating the need for additional components, ensuring efficient operation of wheeled loaders.
Implementation Method 1
having a pump for conveying a hydraulic medium through the hydraulic circuit
Implementation Method 2
the outflow control edge restricts the outflow amount through the outflow of the cylinder on a pulling load on the working tool
Implementation Method 3
A pressure regulator can be provided that cooperates with the pump such that the minimum pressure is maintained on the cylinder side on which a volume increase is produced by the pulling load
Data Source
AI summary
The present invention relates to a mobile work machine, in particular to a wheeled loader, having a hydraulic circuit, having a pump for conveying a hydraulic medium through the hydraulic circuit, and having at least one control block having an inflow control edge and an outflow control edge for controlling the flow of the hydraulic medium, wherein the work machine has a working tool and a cylinder for actuating the working tool and wherein the cylinder has an outflow and in inflow for the hydraulic medium, and wherein the outflow is in fluid communication with the outflow control edge and the inflow is in fluid communication with the inflow control edge, and wherein the inflow control edge does not have any or has fewer fine control notches than the outflow control edge and thus works in a largely unrestricted manner, while the outflow control edge is equipped with one or more fine control notches so that with a pulling load at the working tool, the outflow control edge restricts the outflow amount through the outflow of the cylinder.