Utility Vehicle Joystick Control with Automatic Tilt Lockout
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Solution Overview
Problem
Utility vehicles face challenges in controlling front attachments that require angling instead of tilting, leading to potential damage to attachments and PTO shafts, and operators find it difficult to manage joystick and auxiliary switch simultaneously, necessitating a system that can seamlessly handle lift, tilt, and angling functions while ensuring ergonomic operation.
Innovation Solution
A front attachment control system incorporating a diverter valve and switch, which allows the joystick to control lift, tilt, and angling functions by moving the diverter valve from a tilt to an angling position, locking the tilt cylinder to prevent inadvertent actuation and reducing the risk of damage, and is designed to be ergonomic for various attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator uses a joystick and auxiliary switch to control front attachments, then lift and tilt functions can be performed, but the risk of damage to attachments and PTO shafts increases when tilt function is not locked out before extending angling cylinder
Solution Approach 1:
The system performs preliminary action by automatically locking out the tilt function before allowing the angling cylinder to extend. The controller detects when the angling cylinder is being extended and preemptively disables the tilt cylinder, preventing potential damage before it occurs. This eliminates the need for operators to manually lock out tilt function before using angling attachments.
Solution Approach 2:
The system uses feedback from sensors that detect the state of hydraulic cylinders and attachment positions. When the controller detects that the angling cylinder is extending, it receives feedback and automatically locks out the tilt function. This closed-loop control ensures that incompatible functions cannot be activated simultaneously, preventing damage while maintaining ease of operation.
2Reliability
If the operator manually locks out tilt function before extending angling cylinder, then damage risk is reduced, but the complexity of operation increases
Solution Approach 1:
The system performs self-service by automatically detecting and responding to the extension of the angling cylinder. The controller monitors hydraulic pressure or position sensors and autonomously locks out the tilt function without requiring operator intervention. This eliminates the manual locking-out step while maintaining damage prevention, thereby reducing operational complexity.
3Measurement precision
If separate controls are used for tilt and angling functions, then specific functions can be controlled precisely, but the difficulty of controlling front implement increases
Solution Approach 1:
The system implements multi-functionality by enabling a single joystick to control multiple functions (lift, tilt, and angling) through a unified control architecture. The controller routes hydraulic pressure to different cylinders based on the joystick position and attachment type, allowing operators to perform all front attachment operations with one control device. This maintains precision while reducing control difficulty.
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 enables safe and ergonomic operation of front attachments by allowing the joystick to control lift, tilt, and angling functions, reducing the risk of damage to attachments and PTO shafts, and facilitating the use of different attachments with improved operational efficiency.
Implementation Method 1
A front attachment control system includes a diverter valve and a diverter switch on the front of a utility vehicle... The diverter switch moves the diverter valve from a first position operating a tilt cylinder to a second position operating the angling cylinder.
Data Source
AI summary
A front attachment control system includes a selective control valve controlled by a joystick in a utility vehicle operator station, a diverter valve connected to the selective control valve and having a diverter switch that switches the diverter valve between a first position for an attachment tilt function and a second position for an attachment angling function controlled by the joystick. A front attachment with an angling cylinder includes a pair of hydraulic lines connectable to the diverter valve, and an actuator that engages the diverter switch as the hydraulic lines are connected to the diverter valve to switch the diverter valve to the second position.