Articulated Machine Steering Interlock with Stabilizer Depressurization
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Solution Overview
Problem
Articulated machines with stabilizers face damage due to active steering capabilities when stabilizers are deployed, causing twisting motions that can harm the machine and stabilizers.
Innovation Solution
A steering interlock system that selectively depressurizes the hydraulic steering circuit based on the state of the stabilizer, preventing steering when the stabilizer is deployed and allowing override for controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering system remains active when stabilizers are deployed, then the machine maintains steering capability, but damage occurs to the machine and stabilizers due to twisting motions
Solution Approach 1:
The system performs preliminary detection of stabilizer deployment state and proactively disables the steering system before damage can occur. The directional control valve monitors stabilizer position and preemptively blocks steering hydraulic flow when stabilizers are deployed, preventing the harmful twisting motions before they can cause damage.
Solution Approach 2:
The directional control valve acts as an intermediary between the steering system and the stabilizer state. It mediates the hydraulic flow to the steering cylinder, allowing steering when stabilizers are retracted and blocking it when deployed, thus preventing damage while maintaining operational flexibility.
2Object-affected harmful factors
If the steering system is disabled when stabilizers are deployed, then damage is prevented, but the machine loses steering capability during operations
Solution Approach 1:
The steering system dynamically changes its state based on stabilizer deployment. The directional control valve automatically transitions the steering hydraulic circuit between enabled and disabled states according to real-time stabilizer position, ensuring protection during drilling while allowing steering during movement.
Solution Approach 2:
The system uses feedback from stabilizer position sensors to control the directional control valve. When sensors detect that stabilizers are deployed, this feedback signal triggers the valve to block steering hydraulic flow, creating a closed-loop safety system that automatically responds to machine state changes.
3Adaptability or versatility
If an override option is added to allow controlled tramming with stabilizers deployed, then operational flexibility is enhanced, but system complexity increases
Solution Approach 1:
The override system allows the operator to manually override the safety interlock when needed. By providing a manual control mechanism, the system serves itself by allowing authorized operators to temporarily disable the steering block when controlled tramming is required, balancing safety with operational needs.
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
Prevents damage to the machine and stabilizers by disabling steering when stabilizers are deployed, while allowing controlled tramming through an override option, enhancing safety and operational flexibility.
Implementation Method 1
a directional control valve that selectively depressurizes the hydraulic steering circuit according to a state of the stabilizer
Implementation Method 2
a stabilizer cylinder coupled to the pump and a stabilizer coupled to the stabilizer cylinder, the stabilizer operated between a stowed state and a unstowed state by the stabilizer cylinder
Data Source
AI summary
A machine includes a front section having front wheels, a rear section having rear wheels, and a pivot that couples the front section to the rear section as well as a hydraulic steering circuit that moves the front section relative to the rear section about the pivot. The machine also includes a stabilizer and further includes a directional control valve that selectively depressurizes the hydraulic steering circuit according to a state of the stabilizer.