Road Milling Machine Stabilization via Independent Hydraulic Actuator Control
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Solution Overview
Problem
Road milling machines face challenges in achieving uniform operating results and ensuring adequate tipping resistance, especially on uneven ground, due to their high center of gravity, which increases the risk of tipping over when encountering obstacles or ground unevenness.
Innovation Solution
A pressure measuring device is integrated with the actuators of the transportation means to monitor and adjust the pressure distribution, allowing the control device to independently control the lifting columns to maintain a stable position by adjusting the actuators in a converse manner, thereby enhancing the machine's tipping resistance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the center of gravity is kept high for structural reasons, then the machine maintains its structural configuration, but the tipping resistance decreases
Solution Approach 1:
The control device continuously monitors the actual pressure values from pressure measuring devices allocated to each actuator and compares them with setpoint pressure values. When deviations are detected, the control device automatically adjusts the actuators to restore the desired pressure distribution, creating a closed-loop feedback system that actively compensates for tipping tendencies without requiring structural modifications to lower the center of gravity
Solution Approach 2:
The system dynamically changes the pressure parameter in the hydraulic actuators based on real-time measurements. By adjusting the pressure values in individual actuators independently, the control device can shift the effective support points and counteract tipping moments, thereby improving tipping resistance while maintaining the original structural configuration with high center of gravity
2Reliability
If pressure measuring devices are allocated to each actuator for independent control, then the tipping resistance is improved, but the device complexity increases
Solution Approach 1:
The control device automatically performs the stabilization function by continuously monitoring pressure values and independently adjusting each actuator without requiring manual intervention. The system serves itself by using its own sensors and actuators to maintain stability, eliminating the need for external stabilization equipment or complex mechanical stabilization mechanisms
Solution Approach 2:
The patent replaces complex mechanical stabilization mechanisms with an electronic control system that uses pressure sensors and hydraulic actuators. Instead of mechanical linkages or physical counterweights, the system uses electronic sensing and hydraulic pressure control to achieve stabilization, thereby reducing mechanical complexity while improving reliability
3Adaptability or versatility
If the actuators are controlled independently without hydraulic coupling, then the adaptability to uneven ground is improved, but the loss of hydraulic pressure equilibrium occurs
Solution Approach 1:
The control device uses feedback from pressure measuring devices to detect deviations from setpoint pressure values and automatically adjusts individual actuators to restore equilibrium. This closed-loop control allows each actuator to be independently controlled for adaptability while the feedback mechanism continuously restores hydraulic pressure balance, preventing energy loss
Solution Approach 2:
The system dynamically changes the pressure parameters in each actuator independently based on the specific ground conditions detected by the pressure sensors. The control device adjusts pressure values in real-time to adapt to uneven ground while maintaining overall hydraulic equilibrium through continuous parameter optimization, thereby achieving both adaptability and energy efficiency
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
This solution effectively stabilizes the road milling machine by adjusting the lifting columns based on real-time pressure measurements, reducing the risk of tipping and ensuring safe operation on uneven ground, without the need for hydraulic coupling.
Implementation Method 1
A pressure measuring device is allocated to at least one actuator of a pair of front or rear transportation means, with such pressure measuring device being designed to ascertain the value of a pressure applied to the at least one actuator
Implementation Method 2
the control device controls the actuators in a converse manner, in particular, in order to approach the setpoint pressure value by way of a reverse lift adjustment
Data Source
AI summary
The present invention relates to a construction machine, in particular a ground milling machine, comprising transportation means connected to the machine frame via lifting columns. The lift adjustment of the lifting columns occurs as a function of the determined pressure values respectively applied to at least one actuator of a pair of front and/or rear transportation means. The present invention further relates to a method of compensating for ground unevenness for such a construction machine.