Hydraulic Pressure Control Valve for Work Vehicle Implement
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Solution Overview
Problem
Conventional hydraulic systems for work vehicles face inefficiencies and excessive heat generation when operating implements that require pressure control, as they struggle to adapt to downstream pressure demands, leading to reduced pump efficiency and improper system operation.
Innovation Solution
A system with a pressure control valve upstream of the flow control valve regulates hydraulic fluid pressure, eliminating the need for downstream pressure control devices and allowing for efficient operation in constant down pressure mode by adjusting output pressure through a bypass line and secondary valve actuator, maintaining balanced forces on the valve spool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hydraulic system with a flow control valve is used to supply hydraulic fluid to an implement requiring pressure control, then the flow rate can be maintained constant, but the pump operates at reduced efficiency and generates excessive heat due to inability to adapt to downstream pressure control
Solution Approach 1:
The system performs preliminary pressure regulation by diverting a portion of hydraulic fluid through a bypass line to actuate the pressure control valve before the main flow reaches the implement. This advance pressure control allows the pump to operate efficiently while the pressure control valve adjusts downstream pressure demands, resolving the contradiction between pressure control capability and pump efficiency
2Ease of operation
If a pressure regulating valve is added downstream to provide constant down pressure mode, then pressure control is achieved, but the vehicle's hydraulic system cannot adapt and the pump operates inefficiently
Solution Approach 1:
The system implements feedback control by using a bypass line to divert hydraulic fluid that actuates the pressure control valve. This creates a closed-loop system where the pressure control valve receives feedback about downstream pressure conditions and automatically adjusts to maintain constant down pressure while allowing the pump to operate efficiently, thereby achieving both ease of operation and system adaptability
3Stability of the object's composition
If the flow control valve maintains constant flow rate, then flow stability is achieved, but the pump must operate at maximum pressure output leading to excessive heat generation
Solution Approach 1:
The system segments the hydraulic fluid flow into two paths: a main flow path that maintains constant flow rate for stability, and a bypass path that diverts a portion of fluid to actuate the pressure control valve. This segmentation allows the pump to operate at lower pressure while the pressure control valve manages downstream pressure demands, thereby maintaining flow rate stability while reducing heat generation
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 configuration enhances system efficiency, reduces heat generation, and allows for consistent down pressure application, improving the operation of implements like planters and seeders by maintaining hydraulic fluid pressure within a desired range.
Implementation Method 1
a pressure control valve fluidly coupled to the pump output line. The pressure control valve may be configured to regulate a fluid pressure of the hydraulic fluid being supplied to the control valve from the pump
Implementation Method 2
a bypass line configured to be in fluid communication with the pressure control valve, wherein a portion of the hydraulic fluid supplied through the system is diverted through the bypass line so as to actuate the pressure control valve
Implementation Method 3
The control valve may be configured to supply hydraulic fluid through the first fluid line to the first chamber of the hydraulic cylinder for raising at least one ground-engaging component of the implement relative to the ground and may be configured to supply hydraulic fluid through the second fluid line to the second chamber of the hydraulic cylinder for lowering the ground-engaging component(s) relative to the ground
Data Source
AI summary
In one aspect, a system for controlling the supply of hydraulic fluid to an implement may include a pump, a control valve coupled to the pump and first and second fluid lines provided in flow communication with output ports of the control valve. The system may also include a pressure control valve configured to regulate a pressure of the hydraulic fluid being supplied to the control valve such that the hydraulic fluid is supplied to the control valve at a first pressure for raising at least one ground-engaging component of the implement and a second pressure for lowering the ground-engaging component(s). Moreover, the system may include a bypass line in fluid communication with the pressure control valve such that fluid diverted through the bypass line actuates the pressure control valve to adjust the fluid pressure of the hydraulic fluid supplied to the control valve between the first and second pressures.