Work Vehicle Vibration Control via Hydraulic Accumulator Switching
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Solution Overview
Problem
Conventional travel vibration suppressing devices for work vehicles fail to accurately distinguish between excavation and travel states at high speeds, leading to inefficient work performance and potential damage from excessive hydraulic pressure on the accumulator.
Innovation Solution
A control system that determines the work machine state based on vehicle speed and bucket height, adjusting communication between the hydraulic cylinder and accumulator to optimize power transmission during excavation and vibration suppression during travel, incorporating hysteresis to prevent frequent switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boom cylinders and accumulator are placed in communication during travel to suppress vibration, then ride quality is improved, but work efficiency drops during excavation because power is absorbed by the accumulator
Solution Approach 1:
The system dynamically switches between communication and blocking states based on detected work machine state and vehicle speed. The control unit adjusts the control valve position in real-time, transitioning from a static system to a dynamic one that adapts to operational conditions, resolving the contradiction between vibration suppression and power transmission efficiency
Solution Approach 2:
The system changes the operational parameters of the hydraulic circuit by adjusting the communication state between boom cylinders and accumulator based on detected parameters (vehicle speed, work machine state). This parameter-based control enables optimal performance across different operating conditions
2Reliability
If the vehicle speed threshold is set low for vibration suppression, then ride quality is improved during travel, but work efficiency deteriorates when excavation is performed at high speed
Solution Approach 1:
The control unit receives feedback from the vehicle speed detecting device and work machine state determining device, continuously monitoring operational conditions. Based on this feedback, the system adjusts the control valve to maintain optimal performance, preventing the contradiction from arising in the first place through closed-loop control
Solution Approach 2:
The system determines the work machine state in advance and sets appropriate speed thresholds before excavation begins. By predicting the operational state and preparing the hydraulic circuit accordingly, the system prevents power loss before it occurs
3Reliability
If the boom cylinders and accumulator are placed in communication during high speed excavation, then vibration is suppressed, but excessive hydraulic pressure damages the accumulator
Solution Approach 1:
The control valve acts as an intermediary between the boom cylinders and accumulator, mediating the hydraulic flow based on operational conditions. During high-speed excavation, the control valve blocks or limits communication, preventing excessive pressure from reaching the accumulator while still allowing vibration suppression when appropriate
Solution Approach 2:
The system takes preliminary action to prevent harmful effects by blocking communication between boom cylinders and accumulator during high-speed excavation before excessive pressure can build up. This preventive measure protects the accumulator from damage while maintaining vibration suppression capability when conditions are safe
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
Improves work efficiency at high speeds by ensuring sufficient power is delivered to the work machine and minimizes damage to the accumulator by managing hydraulic pressure, while maintaining ride quality during travel.
Implementation Method 1
vibration during vehicle travel can be absorbed by the accumulator, and transmission of vibration from the boom cylinder to the vehicle as a whole can be minimized
Implementation Method 2
a control valve for bringing about communication or blocking between the hydraulic cylinder and the accumulator
Implementation Method 3
a hydraulic cylinder for operating a work machine
Data Source
AI summary
A travel vibration suppressing device is connected to a hydraulic cylinder for operating a work machine, and utilizes an accumulator to suppress vibration during travel of the vehicle. Upon determining that the state of the work machine is the excavating state, the control unit switches from a state of communication between a hydraulic cylinder and the accumulator to a blocked state when the vehicle speed changes from a speed exceeding a first speed to a speed equal to or less than the first speed. Upon determining that the operating state is the normal state, the state of communication between a boom cylinder and the accumulator is switched to the blocked state when the vehicle speed changes from a second speed lower than the first speed to a speed equal to or less than the second speed.