Variable Displacement Pump Pressure Control via Dynamic Orifice
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Solution Overview
Problem
Prior hydraulic pressure control systems are unstable and exhibit reduced dynamic performance, failing to provide consistent fluid flow rates and supporting multiple consumers with a single pump effectively.
Innovation Solution
A hydraulic pressure control system featuring a variable displacement pump connected to a hydraulic motor, with a pilot controlled pressure reducing valve and a pressure compensated flow control valve, allowing for dynamic performance improvement by adjusting outlet pressure based on sensed load and operational parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pilot controlled pressure reducing valve with fixed orifice is used for pressure control, then the system structure is simple, but the system exhibits instability and reduced dynamic performance
Solution Approach 1:
The patent applies dynamics by replacing the fixed orifice with a variable orifice that can adjust its opening size dynamically. The variable orifice changes its flow area based on system conditions, allowing the system to adapt to varying loads and maintain stability. This transforms a static component into a dynamic one, enabling the pressure control system to respond to changing conditions while maintaining simplicity in overall structure.
2Device complexity
If a fixed orifice is used in the pressure control valve, then the device complexity is low, but the fluid flow rate consistency is poor
Solution Approach 1:
The fixed orifice is replaced with a variable orifice that dynamically adjusts its opening area. This allows the valve to maintain consistent fluid flow rate across varying pressure conditions by adapting the orifice size to compensate for pressure changes, thereby improving flow rate consistency without significantly increasing device complexity.
Solution Approach 2:
The system incorporates feedback mechanisms where the position of the variable orifice is controlled based on sensed pressure conditions. The feedback loop continuously monitors system state and adjusts the orifice opening accordingly, ensuring consistent fluid flow rate while maintaining a relatively simple valve structure.
3Device complexity
If pressure control is implemented without flow compensation, then the system is simpler, but dynamic performance is reduced
Solution Approach 1:
The system incorporates dynamic flow compensation by making the orifice variable rather than fixed. This dynamic element allows the system to respond quickly to changing conditions, improving dynamic response speed while adding only minimal complexity to the control system structure through the use of a variable orifice mechanism.
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 achieves more consistent and stable dynamic performance, enabling efficient operation with multiple consumers by maintaining a constant flow rate and optimizing fan speed through microcontroller-controlled valve actuation.
Implementation Method 1
The load sense line is taken from the pressure signal controlled by pressure control valve 32 between the pressure control valve 32 and the active flow regulator valve 38
Implementation Method 2
A pressure compensated flow control has been added to this conduit to improve dynamic performance
Data Source
AI summary
A hydraulic pressure control system having a variable displacement pump fluidly connected to a hydraulic motor. The pump provides flow to a first circuit upon demand. Remaining flow is provided to a second circuit. The second circuit includes a pilot controlled pressure reducing valve that adjusts the pumps outlet pressure based upon a sensed loads taken from a conduit between the pressure control valve and an active flow regulator valve.