Intelligent Boom Control Hydraulic System for Feller Buncher
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Solution Overview
Problem
Conventional boom hydraulic systems for feller bunchers require significant operator skill to achieve linear constant velocity of the boom tip, especially when moving it in a generally horizontal path, as the tip velocity changes with cylinder speeds throughout the boom's operating envelope.
Innovation Solution
An intelligent boom control hydraulic system with a straight-line feature, which includes a hoist boom and a stick boom, utilizes position sensors, hydraulic fluid pumps, and control valves to compute and direct hydraulic fluid flow based on target velocities derived from operator input, enabling precise control of the boom tip movement in a horizontal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional boom hydraulic systems are used with minimal manipulation, then the system structure remains simple, but the operator skill requirement increases significantly to achieve linear constant velocity of the boom tip
Solution Approach 1:
The patent replaces manual mechanical control with an intelligent control system that uses sensors to detect boom position and microprocessors to calculate and control hydraulic valve operation. This substitution eliminates the need for operator skill in coordinating multiple joysticks while achieving the desired linear constant velocity motion.
Solution Approach 2:
The patent implements feedback control by using position sensors to continuously monitor boom tip position and feeding this information back to the microprocessor. The microprocessor then adjusts hydraulic valve commands based on the difference between actual and desired position, enabling automatic maintenance of linear constant velocity without operator intervention.
2Ease of operation
If the boom tip is moved in a generally horizontal path by coordinating multiple joysticks, then the boom tip can be positioned horizontally, but the ease of operation decreases due to simultaneous coordination requirements
Solution Approach 1:
The patent merges the control of multiple joysticks into a single integrated control interface. The microprocessor combines inputs from operator control devices and automatically coordinates the hydraulic valves to achieve horizontal boom tip movement, eliminating the need for simultaneous manual coordination of multiple controls.
Solution Approach 2:
The microprocessor acts as an intermediary between the operator's simple horizontal movement command and the complex coordinated valve operations required to achieve the actual horizontal boom tip path. This intermediary automatically handles the coordination complexity while presenting a simple user interface.
3Adaptability or versatility
If conventional methods are used for horizontal boom tip movement, then the system remains relatively simple, but the elevation range is limited
Solution Approach 1:
The patent implements dynamic control by continuously adjusting hydraulic valve positions based on real-time sensor feedback about boom position. This dynamic adjustment enables the system to maintain horizontal boom tip movement across a wide elevation range, adapting to changing boom orientations automatically rather than requiring static control settings.
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 simplifies operator control by allowing direct input of desired boom tip velocities, converting these into appropriate actuator movements, thereby improving the precision and ease of moving the boom tip in a horizontal path, beyond the limited elevation range of conventional systems.
Implementation Method 1
hydraulic fluid pump, a hydraulic reservoir including hydraulic fluid, and various valves. A hoist control valve controls flow from the hydraulic pump to the base end of the hoist hydraulic cylinder
Implementation Method 2
A hoist boom position sensor provides hoist boom position readings. A stick boom position sensor provides stick boom position readings.
Data Source
AI summary
An intelligent boom control hydraulic system with a straight-line feature, for a feller buncher is disclosed. The system comprises a hoist hydraulic cylinder, a stick hydraulic cylinder, a hoist boom position sensor, a stick boom position sensor, a hydraulic fluid pump, a hydraulic reservoir including hydraulic fluid, and various valves. A hoist control valve controls flow from the hydraulic pump to the hoist hydraulic cylinder, and the hoist hydraulic cylinder to the hydraulic reservoir. A stick control valve controls flow from the hydraulic pump stick hydraulic cylinder, and the stick hydraulic cylinder to the hydraulic reservoir. A straight-line control valve the hoist hydraulic cylinder and the stick hydraulic cylinder. A microprocessor directs sends signals to control the hydraulic fluid flow through control valves based on target hoist stick boom velocities and a look up chart to select valve combinations to achieve the target hoist and stick boom velocities.