Dual Pressure Logic for Track Drill Hydraulic Circuit
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Solution Overview
Problem
Hydraulic systems face instability and premature wear when used with oscillating machine implements due to the difficulty in controlling variable or load-responsive configurations, leading to increased hydraulic noise and energy wastage.
Innovation Solution
A hydraulic circuit and control system that includes a variable displacement pump selectable between two operational modes, coupled with directional valves and a controller to manage the pump's output, allowing for switching between fixed and variable pressure modes to suit different hydraulic implements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If variable or load responsive hydraulic system configurations are used, then power and energy efficiency is improved, but system stability deteriorates and control difficulty increases
Solution Approach 1:
The patent implements a variable displacement pump that can dynamically adjust its operating mode between fixed pressure and variable pressure configurations. The controller selectively actuates the pump to operate in pressure compensated mode for oscillating implements (maintaining stability) or in load sense mode for tramming functions (optimizing energy efficiency), thus resolving the contradiction between stability and energy efficiency through dynamic mode switching
Solution Approach 2:
The system changes the pressure parameter dynamically by switching between two distinct operational modes of the variable displacement pump. In pressure compensated mode, the pump maintains constant pressure for stable operation of oscillating implements. In load sense mode, the pump adjusts pressure based on load demands to optimize energy efficiency. This parameter change resolves the contradiction by adapting pressure characteristics to different operational requirements
2Use of energy by moving object
If variable or load responsive hydraulic system configurations are used, then energy efficiency is improved, but control difficulty increases leading to premature wear
Solution Approach 1:
The controller dynamically switches between pressure compensated mode and load sense mode based on the operational requirements. For oscillating implements, the system uses pressure compensated mode with fixed pump pressure to ensure stability and prevent premature wear. For tramming functions, the system switches to load sense mode to optimize energy efficiency. This dynamic adaptation resolves the contradiction between energy efficiency and component reliability
Solution Approach 2:
The system maintains two distinct control pathways (pressure compensated mode and load sense mode) that can be selectively activated. Each mode is optimized for specific implement types, allowing the system to copy the appropriate control characteristics for each application scenario, thereby preventing wear in oscillating implements while achieving energy efficiency in load-responsive applications
3Stability of the object's composition
If fixed pressure pump configuration is used, then system stability is improved for oscillating implements, but energy efficiency deteriorates
Solution Approach 1:
The variable displacement pump dynamically switches between fixed pressure mode (pressure compensated) and variable pressure mode (load sense) based on operational requirements. When oscillating implements are active, the pump operates in fixed pressure mode to maintain stability. When tramming functions are active, the pump switches to variable pressure mode to improve energy efficiency. This dynamic switching resolves the contradiction between stability and energy efficiency
Solution Approach 2:
The system changes the pressure parameter from fixed to variable based on the operational mode. In pressure compensated mode, the pump maintains constant pressure for stable operation of oscillating implements. In load sense mode, the pump adjusts pressure according to load demands to optimize energy efficiency. This parameter change resolves the contradiction by adapting pressure characteristics to different operational contexts
Data Source
AI summary
A hydraulic circuit may be used for controlling a plurality of hydraulic implements. The hydraulic circuit may include a first directional valve, a second directional valve, and a relief valve. A variable displacement pump may be fluidly coupled to the first directional valve, the second directional valve, and the relief valve. The hydraulic circuit may be communicably and operably coupled to a controller, and the controller may be programmed to selectably control the hydraulic circuit between a first operational mode and a second operational mode. Additionally, the controller may be programmed to actuate the first directional valve between an open position and a closed position and to actuate the second directional valve between a first open position, a second open position, a first closed position and a second closed position.