Slewing Drive Control Valve for Hydraulic Interference Compensation
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Solution Overview
Problem
Existing slewing-type working machines face issues with hydraulic interference when both the slewing motor and another hydraulic actuator are actuated simultaneously, leading to low slewing torque and unsynchronized acceleration due to hydraulic pressure limitations.
Innovation Solution
A drive control apparatus with a compensation control valve and a controller that adjusts the opening degree of hydraulic flow rates to the slewing motor and actuators, ensuring the actual slewing acceleration matches the target acceleration based on operator input, even during combined manipulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a hydraulic pump is utilized for both slewing motor and another hydraulic actuator, then hydraulic system efficiency is improved, but hydraulic interference occurs resulting in low slewing torque during combined manipulation
Solution Approach 1:
A compensation control valve is introduced as an intermediary device between the hydraulic pump and the first actuator. This valve compensates for the hydraulic interference by adjusting the flow distribution, ensuring that the slewing motor receives sufficient hydraulic pressure and flow rate to maintain high slewing torque even during combined manipulation with other actuators.
Solution Approach 2:
The opening degree of the compensation control valve is dynamically changed based on the slewing acceleration feedback. When hydraulic interference is detected (actual slewing acceleration deviates from target acceleration), the controller adjusts the valve opening degree to modify the hydraulic flow parameters, thereby restoring the desired sleving torque and acceleration performance.
2Device complexity
If a hydraulic pump is utilized for both slewing motor and another hydraulic actuator, then system complexity is reduced, but slewing acceleration cannot be controlled according to manipulation amount during combined manipulation
Solution Approach 1:
A feedback control mechanism is implemented where the actual slewing acceleration is continuously monitored and compared with the target acceleration. The controller uses this feedback information to dynamically adjust the opening degree of the compensation control valve, ensuring that the slewing acceleration accurately follows the operator's manipulation input even during combined manipulation, thereby maintaining ease of operation.
3Loss of energy
If limitation degree on actuator flow rate is increased to reduce pressure loss, then energy efficiency is improved, but operability during combined manipulation deteriorates due to insufficient slewing acceleration
Solution Approach 1:
The limitation degree on actuator flow rate is made dynamic rather than fixed. The compensation control valve's opening degree is continuously adjusted based on real-time feedback of slewing acceleration and manipulation amount. This dynamic adjustment allows the system to optimize the balance between pressure loss reduction and maintaining sufficient slewing acceleration, improving both energy efficiency and operability during combined manipulation.
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
Enables precise control of slewing acceleration, enhancing operational efficiency and synchronization of movements in slewing-type working machines by compensating for hydraulic interference.
Implementation Method 1
a compensation control valve between the hydraulic pump and the first actuator that has an adjustable opening degree for changing a flow rate of hydraulic oil to be supplied from the hydraulic pump to the first actuator
Implementation Method 2
a hydraulic pump; a slewing motor that slews an upper slewing body supporting a working device
Data Source
AI summary
A drive control apparatus for a slewing-type working machine includes: a compensation control valve between a hydraulic pump and a first actuator that has an adjustable opening degree for changing a flow rate of hydraulic oil to be supplied from the hydraulic pump to the first actuator; a slewing manipulation device that receives a slewing manipulation for actuating a slewing motor; a first manipulation device that receives a first manipulation for actuating the first actuator; and a controller that adjusts, during a combined manipulation of the first manipulation and the slewing manipulation, the opening degree of the compensation control valve to cause an actual slewing acceleration to reach a target slewing acceleration according to a manipulation amount of the slewing manipulation.