Intelligent Boom Control for Forestry Machinery
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Solution Overview
Problem
The complexity of boom movement in forestry machinery, such as feller bunchers, due to changing geometry and varying actuator speeds, makes precise control of end effectors difficult for operators, requiring significant skill and practice.
Innovation Solution
A hydraulic control system with a controller, hoist and stick actuators, position sensors, and valves that allow fluid communication between actuators based on sensor feedback and user input, enabling intuitive velocity commands for end effector movement, simplifying operator control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional control systems are used with multiple booms, then the boom assembly can perform complex movements, but the control complexity increases significantly requiring significant operator training
Solution Approach 1:
The patent introduces an intermediary control system that translates simple operator inputs (single joystick movements) into complex coordinated actuator commands. The control system acts as a mediator between the operator's intuitive movements and the multiple actuators, automatically calculating the required actuator movements based on desired end effector position and current boom configuration.
Solution Approach 2:
The patent replaces complex mechanical control linkages with an electronic control system that uses sensors, processors, and algorithms to determine actuator commands. This substitution of mechanical control with intelligent electronic control allows for simplified operator interfaces while maintaining precise control of complex boom movements.
2Adaptability or versatility
If the boom geometry changes during operation, then the end effector can reach different positions, but the relationship between actuator movement and end effector movement becomes unpredictable
Solution Approach 1:
The patent implements feedback control by continuously monitoring boom positions using sensors (encoders, potentiometers, or vision systems) and using this information to calculate the appropriate actuator commands. The control system constantly updates its understanding of the current boom configuration and adjusts actuator movements accordingly to achieve the desired end effector position.
Solution Approach 2:
The patent employs dynamic control algorithms that adapt to changing boom configurations in real-time. The control system continuously recalculates the relationship between actuator movements and end effector position based on current boom angles and lengths, allowing for accurate positioning despite the dynamic changing geometry of the system.
3Adaptability or versatility
If boom movement speed varies based on location, then the boom can adapt to different operational positions, but the user experiences unexpected acceleration or deceleration
Solution Approach 1:
The control system uses feedback from position sensors to monitor boom movement in real-time and adjusts actuator commands to maintain predictable movement characteristics. By continuously measuring actual boom positions and comparing them to desired positions, the system can compensate for variations in movement speed and prevent unexpected acceleration or deceleration.
Solution Approach 2:
The patent dynamically adjusts control parameters such as gain values, velocity limits, and acceleration profiles based on the current boom configuration and position. This allows the system to maintain smooth, predictable movement across the entire range of motion by adapting control parameters to the specific operational context.
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 system allows for precise and intuitive control of end effector movement, reducing operator skill requirements and improving control accuracy by converting velocity commands into actuator movements, regardless of changing boom orientations.
Implementation Method 1
A pump is fluidly connected to the hoist actuator and can fluidly communicate with the hoist actuator through a hoist valve. The pump is also fluidly connected to the stick actuator and can fluidly communicate with the stick actuator through a stick valve.
Implementation Method 2
The controller can receive information from the hoist boom position sensor and the stick boom position sensor
Data Source
AI summary
A work machine has a connecting valve which is positioned fluidly between a hoist actuator and a stick actuator to permit fluid flow between the hoist actuator and the stick actuator when the connecting valve is open. When the connecting valve is closed, fluid flow is inhibited between the hoist actuator and the stick actuator. A controller can receive information from a hoist boom position sensor and a stick boom position sensor, the controller can receive input from a user interface, and the controller can communicate signals to the hoist actuator and the stick actuator based upon the information from the hoist boom position sensor and the stick boom position sensor, and the input from the user interface.