Hydraulic Pump Compensator Assembly for Highest-Load Pressure Control
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Solution Overview
Problem
Conventional hydraulic systems in work vehicles, such as agricultural tractors, often discharge hydraulic fluid at pressures and flow rates higher than necessary, leading to increased engine load and reduced fuel efficiency due to redundant valve configurations that prioritize upstream valve positions over downstream load requirements.
Innovation Solution
A system and method that utilize a pump compensator assembly with an electronically controlled pressure compensator valve and flow compensator valve to adjust the swash plate position of the pump based on the highest pressure of the hydraulic loads, rather than the fully open upstream valve positions, ensuring the pump operates efficiently by matching fluid discharge to the actual load requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump discharges hydraulic fluid at high pressure and flow rate to ensure sufficient supply to hydraulic loads, then the hydraulic loads receive adequate fluid, but the engine load increases and fuel efficiency decreases
Solution Approach 1:
The pump system dynamically adjusts its discharge pressure and flow rate based on real-time feedback from load sense lines and pressure compensator valves. The swash plate angle is continuously modified to match the actual hydraulic load requirements, transitioning from static high-pressure operation to dynamic demand-responsive operation, thereby reducing engine load while ensuring adequate fluid supply.
Solution Approach 2:
The system implements feedback control through load sense conduits that monitor pressure at the hydraulic loads and transmit this information to the pressure compensator valves. These valves then regulate pump output by adjusting the swash plate position based on actual load conditions, creating a closed-loop control system that optimizes fuel efficiency while maintaining reliable hydraulic fluid supply.
2Ease of operation
If redundant valve arrangements are used with upstream valves fully opened, then the system structure is simplified and operation is easier, but the pump operates at higher pressure than needed by the loads
Solution Approach 1:
The pressure compensator valves act as intermediaries between the pump and the hydraulic loads. These valves monitor the actual pressure requirements at the loads through load sense lines and regulate pump output accordingly, mediating between the simple fully-open valve configuration and the need for precise pressure control to minimize energy consumption.
Solution Approach 2:
The system changes the operating parameters of the pump by dynamically adjusting the swash plate angle based on load conditions. This allows the pump to operate at varying pressures and flow rates matched to actual demand, transforming from constant high-pressure operation to variable parameter operation that reduces energy loss while maintaining the simple redundant valve structure.
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 approach reduces the engine load and improves fuel economy by controlling the pump operation based on the highest pressure of the hydraulic loads, thereby optimizing energy consumption and reducing unnecessary fluid discharge.
Implementation Method 1
a load sense conduit configured to receive a portion of the hydraulic fluid from the first or second fluid conduit in which the hydraulic fluid is at a greater pressure
Data Source
AI summary
A system for controlling pump operation within a work vehicle includes a pump configured to discharge hydraulic fluid into a fluid supply conduit for delivery to first and second hydraulic loads of an associated agricultural implement. Furthermore, the agricultural vehicle includes a pump compensator assembly configured to control the operation of the pump. The pump compensator assembly, in turn, includes a pump regulation actuator and a flow compensator valve. Moreover, the pump compensator assembly includes an electronically controlled pressure compensator valve configured to at least partially control the flow of the hydraulic fluid to the pump regulation actuator for use in controlling the operation of the pump.