Hydraulic Load-Sense Pressure Control for Lower Pump Loss
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Solution Overview
Problem
Work vehicles face inefficiencies in hydraulic fluid flow control, leading to increased energy consumption and reduced fuel economy due to the need for pumps to operate at higher pressures than necessary to compensate for pressure drops in hydraulic systems.
Innovation Solution
A system that includes a hydraulic load, a pump, flow control valves, compensator valves, pilot conduits, and load sense conduits, with pilot and load sense valves controlled by a computing system to adjust pressures and reduce energy consumption by optimizing fluid flow based on sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump operates at higher pressure to compensate for pressure drops in the hydraulic system, then the hydraulic load can be actuated properly, but energy consumption increases and fuel economy decreases
Solution Approach 1:
The compensator valve is made adjustable to dynamically adapt the pressure drop across the flow control valve to actual operating conditions. By allowing the operator to modify the compensator valve setting based on specific application requirements, the system transitions from a static high-pressure design to a dynamic adjustable system, reducing unnecessary energy consumption while maintaining reliable hydraulic load actuation
Solution Approach 2:
The invention changes the pressure parameter by allowing adjustment of the compensator valve to modify the pressure drop across the flow control valve. This parameter change enables the system to operate at lower pressures when full compensation is not needed, thereby reducing energy consumption while still ensuring proper hydraulic load actuation when required
2Ease of operation
If the pump operates at higher pressure to compensate for pressure drops, then flow control is maintained, but fuel economy is reduced
Solution Approach 1:
The adjustable compensator valve introduces dynamic adaptability to the flow control system. Instead of maintaining a fixed high pressure drop, the compensator valve can be adjusted to provide only the necessary pressure compensation for current operating conditions, thereby maintaining effective flow control while reducing fuel consumption
Solution Approach 2:
The invention enables parameter changes in the pressure drop across the flow control valve through adjustable compensator valve settings. This allows the system to optimize the balance between flow control performance and energy efficiency, reducing fuel economy losses while maintaining adequate flow control capability
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
The system reduces energy consumption and improves fuel economy by minimizing pressure drops across flow control valves and pump operation, thereby enhancing the efficiency of hydraulic fluid flow in work vehicles.
Implementation Method 1
a pilot conduit valve fluidly coupled to the pilot conduit, with the pilot conduit valve configured to adjust the pressure of the pilot flow within the pilot conduit
Implementation Method 2
an operation of the compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit
Implementation Method 3
a load sense valve fluidly coupled to the load sense conduit, the load sense valve configured to adjust the pressure of the bleed flow within the load sense conduit
Implementation Method 4
a pump configured to supply hydraulic fluid to the hydraulic load via a fluid supply conduit
Data Source
AI summary
A system for controlling hydraulic fluid flow within a work vehicle includes a pilot conduit configured to receive a pilot flow of hydraulic fluid from a fluid supply conduit such that the operation of a compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit. Furthermore, a pilot conduit valve is configured to adjust the pressure of the pilot flow within the pilot conduit. In addition, the system includes a load sense conduit configured to receive a bleed flow of the hydraulic from the fluid supply conduit such that the operation of the pump is controlled based on a pressure of the bleed flow within the load sense conduit. Moreover, a load sense valve is configured to adjust the pressure of the bleed flow within the load sense conduit.