Fluid Pump Control Assembly Preventing Pressure Spikes
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Solution Overview
Problem
Fluid systems require variable flow rates and pressures, and existing pump control assemblies often lead to pressure spikes when actuators reach their travel limits, which can cause operational instability.
Innovation Solution
A pump control assembly comprising a fluid pump, actuator assembly, ramping valve assembly, and electronic control unit that adjusts the fluid pump's displacement based on actuator position, using a load sensing compensator valve and pressure limiting compensator to prevent pressure spikes by gradually changing the fluid flow and pressure as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the fluid pump's displacement is adjusted rapidly to meet variable flow requirements, then the system responds quickly to changing demands, but pressure spikes occur when actuators reach their travel limits
Solution Approach 1:
The electronic control unit receives advance notification when an actuator is approaching its travel limit and preemptively adjusts the fluid pump's displacement downward. This preliminary action prevents the pressure spike from occurring in the first place, rather than reacting after the spike has already formed. The control system proactively modifies pump displacement based on predicted actuator position feedback.
Solution Approach 2:
The system dynamically adjusts the fluid pump's displacement in real-time based on actuator position feedback. The electronic control unit continuously monitors actuator travel and modulates pump displacement accordingly, creating a dynamic response that adapts to changing system conditions. This dynamic control allows the system to smoothly transition between different displacement levels to prevent pressure spikes while maintaining responsive operation.
2Stability of the object's composition
If the fluid pump's displacement is gradually adjusted to prevent pressure spikes, then pressure stability is improved, but the system response time to meet variable flow requirements increases
Solution Approach 1:
By receiving advance feedback about actuator position and predicting when the actuator will reach its travel limit, the control system performs the displacement adjustment beforehand. This eliminates the need for gradual adjustment during the critical moment, allowing for both stability and timely response. The system prepares the pump displacement in advance based on predicted system state.
Solution Approach 2:
The system uses feedback from the actuator's position to continuously inform the electronic control unit about the current system state. This feedback loop enables the control unit to make informed decisions about when and how to adjust pump displacement, balancing the need for pressure stability with the requirement for responsive operation. The feedback mechanism allows the system to anticipate and react to changing conditions optimally.
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 solution effectively prevents pressure spikes and ensures smoother operation by gradually adjusting the fluid pump's displacement as the actuator reaches its limits, maintaining system pressure within set parameters.
Implementation Method 1
A pump control assembly (10) adapted to control the output of a fluid pump (20) based on a position of an actuator (60) includes a load sensing compensator valve assembly (22)
Implementation Method 2
a pressure limiting compensator (44) to prevent pressure spikes
Implementation Method 3
a ramping valve assembly (16) that is adapted to control a flow of fluid to the actuator assembly (14)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A pump control assembly includes a fluid pump assembly (12) having a fluid pump (20) and a load sensing valve. The fluid pump includes a fluid inlet (24) and a fluid outlet (26). The fluid pump includes a variable displacement mechanism (36). The load sensing valve (42) is adapted to adjust the position of the variable displacement mechanism. The load sensing valve includes a first end (46) and an oppositely disposed second end (48). An actuator (60) is in fluid communication with the fluid pump assembly. A position sensor (100) monitors the position of the actuator. A ramping valve (110) provides selective fluid communication between the fluid outlet of the fluid pump and the first end of the load sensing valve. An electronic control unit is in electrical communication with the position sensor and the ramping valve. The electronic control unit transmits an output current to the ramping valve in response to the position of the actuator.