Hydraulic Swing Pump Sequencing for Stable Flow
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Solution Overview
Problem
Conventional hydraulic systems for machines experience inconsistent and sudden movements due to direct control of hydraulic components, leading to inefficiencies and potential damage from unpredictable flowrate and pressure variations.
Innovation Solution
A hydraulic swing system with a controller that engages multiple pumps sequentially to maintain a consistent flowrate by activating one pump initially and engaging the next when the first reaches a displacement threshold, reducing sudden pressure changes and enhancing controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pumps are engaged simultaneously to increase flowrate, then productivity is improved, but pressure stability deteriorates due to sudden pressure spikes and inconsistent flow
Solution Approach 1:
The controller engages pumps in a predetermined sequential order rather than simultaneously. The first pump is activated initially, and subsequent pumps are engaged only after the previous pump has reached a specific displacement threshold, preventing sudden pressure spikes while systematically increasing flowrate to meet productivity demands
Solution Approach 2:
The system dynamically adjusts the engagement timing of each pump based on the real-time displacement state of the previous pump. This dynamic control ensures that pumps are activated at optimal moments, maintaining pressure stability while achieving the required flowrate for high productivity
2Stress or pressure
If pumps are operated out-of-phase to maintain continuous pressure, then pressure stability is improved, but flowrate control precision deteriorates due to inability to incrementally adjust flow
Solution Approach 1:
The pump operation is segmented into distinct phases where each pump operates in sequence rather than overlapping out-of-phase. This segmentation allows the controller to precisely manage the activation and displacement of each individual pump, achieving both pressure continuity and accurate flowrate control through staged engagement
Solution Approach 2:
The controller monitors the displacement threshold of each pump and uses this feedback information to determine when to engage the next pump. This closed-loop control ensures precise flowrate adjustment while maintaining continuous pressure, resolving the contradiction between pressure stability and flow control precision
3Loss of time
If direct control of hydraulic components is used to respond to user inputs, then response time is improved, but movement consistency deteriorates due to sudden and unpredictable acceleration
Solution Approach 1:
The system prepares for movement by sequentially engaging pumps in advance of full operation. When a user input is received, the controller has already positioned pumps in optimal engagement states, allowing immediate response while maintaining consistent acceleration through pre-planned pump activation sequences rather than sudden full-power engagement
Data Source
AI summary
Systems and method for operating a hydraulic swing system are described herein. The hydraulic swing system may include a first hydraulic pump and a second hydraulic pump in fluid communication with one another. A first hydraulic motor configured to drive rotation of the hydraulic swing system and may be in fluid communication with the first hydraulic pump and the second hydraulic pump. A controller configured to increase a rate of rotation of the hydraulic swing system in a first direction by: engaging the first hydraulic pump to provide a hydraulic fluid through the first hydraulic path to the first hydraulic motor to drive rotation of the hydraulic swing system; and engaging the second hydraulic pump to provide hydraulic fluid through the first hydraulic path to the first hydraulic motor to drive rotation of the hydraulic swing system.