Shovel Hydraulic Pump Control for Smooth Energy-Saving Operation
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Solution Overview
Problem
Existing shovel controllers cause sudden increases or decreases in hydraulic actuator discharge quantity, leading to shocks and uncomfortable operations.
Innovation Solution
A shovel with a controller that uses energy-saving control to manage hydraulic pump discharge quantity by adjusting the swash plate tilt angle based on negative control pressure, smoothing changes in discharge pressure and quantity through feed-forward control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the discharge quantity of the hydraulic pump is controlled based on negative control pressure, then energy saving is achieved, but sudden changes in discharge quantity cause shocks and uncomfortable operations
Solution Approach 1:
The controller performs preliminary action by predicting future discharge quantity based on current negative control pressure trends. The feed-forward control calculates the rate of change of negative control pressure and uses this to anticipate required discharge quantity adjustments, preventing sudden changes before they occur. This resolves the contradiction by smoothing energy-saving control while maintaining operational comfort.
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual discharge quantity and comparing it with the commanded discharge quantity. The controller adjusts the hydraulic pump output based on this feedback to eliminate deviations, ensuring that energy-saving operations do not produce sudden shocks. This combines energy saving with operational smoothness through closed-loop control.
2Productivity
If the discharge quantity changes rapidly to respond to operational demands, then productivity is improved, but shocks are generated causing operator discomfort
Solution Approach 1:
The feed-forward control performs preliminary action by predicting the required discharge quantity based on the rate of change of negative control pressure. This allows the system to prepare for upcoming operational demands smoothly, maintaining productivity while avoiding sudden shocks that cause operator discomfort.
Solution Approach 2:
The controller dynamically adjusts the discharge quantity command value based on real-time conditions. By calculating the rate of change of negative control pressure and adapting the discharge quantity accordingly, the system maintains optimal response speed while dynamically preventing shock generation, thus resolving the contradiction between productivity and operator comfort.
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
Prevents sudden shocks and awkward movements by smoothly controlling hydraulic actuator operations, optimizing energy use and reducing operator discomfort.
Implementation Method 1
a hydraulic pump configured to be driven by the engine
Data Source
AI summary
A shovel includes a lower traveling structure, an upper swing structure swingably mounted on the lower traveling structure, an engine mounted on the upper swing structure, a hydraulic pump configured to be driven by the engine, and processing circuitry configured to determine a command value by energy saving control and to control a flow rate of hydraulic oil discharged by the hydraulic pump according to the command value. The processing circuitry is configured to control the command value.