Hydraulic Arm Stability Control via Load-Dependent Travel Limiting
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Solution Overview
Problem
Industrial work machines face instability issues when lifting heavy loads, particularly when the load exceeds a certain threshold, as the existing hydraulic systems do not effectively adjust the lifting height and fluid output to maintain stability and prevent tipping.
Innovation Solution
A hydraulic system with a mechanical arm, load sensor, position sensor, and controller that adjusts the upper position of the arm and derates fluid output when the load exceeds a threshold, reducing the travel distance and preventing instability by limiting the maximum height and derating the boom raise command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hydraulic system allows the mechanical arm to reach its maximum upper position, then the lifting capacity and operational range are improved, but the stability deteriorates when heavy loads are lifted
Solution Approach 1:
The system dynamically adjusts the maximum upper position of the mechanical arm based on the detected load weight. When a heavy load is detected, the controller automatically reduces the maximum elevation angle of the arm, preventing the machine from tipping while still allowing operational flexibility for lighter loads.
Solution Approach 2:
The controller changes the operational parameters (maximum elevation angle and fluid output) based on the load conditions. By varying these parameters according to the detected load weight, the system maintains stability across different operating conditions while preserving lifting capacity when appropriate.
2Power
If the hydraulic system provides full fluid output to the actuator, then the lifting speed and power are improved, but the risk of tipping increases when heavy loads are present
Solution Approach 1:
The controller adjusts the fluid output parameter based on load detection. When a heavy load is detected, the system reduces the maximum fluid output to the hydraulic actuator, limiting the lifting power to prevent tipping while maintaining adequate power for lighter loads.
Solution Approach 2:
The load detection sensor provides feedback to the controller about the current load weight. The controller uses this feedback to automatically adjust the fluid output parameter, creating a closed-loop control system that maintains stability while preserving lifting capability.
3Stability of the object's composition
If the system reduces the travel distance of the mechanical arm to improve stability, then the machine stability is improved, but the operational range is reduced
Solution Approach 1:
The system dynamically adjusts the travel distance of the mechanical arm based on load conditions. When no heavy load is present, the arm can operate through its full travel range. When a heavy load is detected, the system reduces the travel distance to maintain stability, thus adapting the operational range to current conditions rather than permanently limiting it.
Data Source
AI summary
A work machine includes a mechanical arm. A work implement is coupled to the mechanical arm to receive a load. A hydraulic actuator moves the arm between a lower position and an upper position, wherein a distance between the lower position and the upper position is a travel distance of the mechanical arm. A sensor unit is configured to sense the load in the work implement. A valve is in fluid communication with the hydraulic actuator for supplying a fluid output to the hydraulic actuator. A controller is in communication with the valve and the sensor unit. The controller is configured to transmit a control signal to the valve to adjust the fluid output to the hydraulic actuator. The controller is also configured to adjust the upper position to reduce the travel distance in response to the load being at or above a threshold value.