Hydraulic Control Device for Industrial Machine Actuator Lag
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial machines like power shovels face energy conservation challenges and battery life extension, but experience actuator lag and unpleasant sensations during engine restart due to decreased hydraulic pressure after engine stoppage.
Innovation Solution
A control device with a first hydraulic pump, a second hydraulic pump for pilot pressure, an accumulator, and control valves that manage hydraulic oil supply and pressure to minimize energy consumption and ensure smooth startup by maintaining hydraulic pressure through controlled pump operation and accumulator use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is stopped to conserve energy and extend battery life, then energy consumption is reduced and battery life is extended, but hydraulic pressure decreases causing actuator lag during restart
Solution Approach 1:
The system performs preliminary action by accumulating hydraulic oil in the accumulator before the engine is actually stopped. The accumulator is charged during engine operation so that when the engine stops and hydraulic pressure would normally drop, the accumulator can immediately supply hydraulic oil to maintain pressure and prevent actuator lag during restart.
2Loss of time
If the engine is stopped during non-operating state, then energy is conserved and battery life is extended, but a suitable time is needed for restart and actuation lags
Solution Approach 1:
The accumulator is pre-charged with hydraulic oil during engine operation before shutdown occurs. This preliminary accumulation of hydraulic energy eliminates the need for waiting time during restart, as the hydraulic system can immediately respond to operating lever movements without lag, thus maintaining productivity while allowing engine shutdown for energy conservation.
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 minimizes energy consumption and ensures quick, smooth actuator startup by maintaining hydraulic pressure, reducing lag and energy wastage during operation and restarts.
Implementation Method 1
a second accumulator capable of accumulating and retaining the hydraulic oil pressure supplied from the second hydraulic pump to the pilot valve
Implementation Method 2
a first hydraulic pump for supplying hydraulic oil for actuating the hydraulic actuator
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A control device of an industrial machine comprises an operating device (19), a hydraulic actuator group (31), a control valve group (32), a hydraulic pump (33), a solenoid valve (35), a pilot valve group (42), first and second accumulators (36, 46), a battery (51), a controller (52), and first and second inverters (53, 54), wherein the controller (52) performs a control for stopping the driving of the pump when the operating device (19) is not operated for at least a predetermined time duration, starting the driving of the pump when the internal pressure of the second accumulator (46) has decreased to be equal to or less than a predetermined lower limit pressure, and stopping the driving of the pump when the internal pressure of the second accumulator (46) has increased to be equal to or greater than a predetermined upper limit pressure due to starting the driving of the pump.