Paving Machine Steering Control System with Automatic Flow Sharing Valve
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Solution Overview
Problem
Conventional paving machine control systems are labor-intensive, unsafe, and allow for pivot steering at any time and wheel position, causing stress on stationary wheels and potential damage to the base pavement, with a risk of accidental engagement at unsafe speeds.
Innovation Solution
A steering control system with a speed sensor, steering cylinder, steering cylinder sensor, and flow sharing valve, controlled by a controller, that automatically enables and disables pivot steering based on speed and wheel position to ensure safe and controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional control systems allow pivot steering at any time and wheel position, then the operator has maximum maneuverability, but this causes stress on stationary wheels and potential damage to the base pavement
Solution Approach 1:
The system changes the operational parameters of pivot steering by monitoring wheel position and speed, and only permitting pivot steering when parameters are within safe ranges (wheel within threshold of straight position, speed below threshold). This resolves the contradiction by making maneuverability conditional rather than universal.
Solution Approach 2:
The control system continuously monitors wheel position via sensors and feeds this information back to the controller, which automatically enables or disables pivot steering mode accordingly. This feedback mechanism ensures that pivot steering is only permitted when the wheel is within the safe threshold position, preventing stress on stationary wheels and base pavement.
2Adaptability or versatility
If conventional control systems allow pivot steering regardless of speed, then the operator has operational flexibility, but this creates risk of accidental engagement at unsafe speeds
Solution Approach 1:
The system changes the operational parameters by introducing speed as a conditional parameter for pivot steering engagement. The controller monitors speed continuously and only permits pivot steering when speed is below a predetermined threshold, thereby maintaining operational flexibility within safe parameters while preventing accidental engagement at unsafe speeds.
3Device complexity
If automatic pivot steering is implemented without speed and position monitoring, then the system is simpler, but this allows unsafe operation conditions
Solution Approach 1:
The system employs feedback mechanisms where sensors monitor wheel position and speed, and this information is fed back to the controller which automatically adjusts pivot steering mode accordingly. This feedback approach maintains system simplicity while ensuring safe operation through automated monitoring and control.
Solution Approach 2:
The control system performs self-monitoring and self-regulation by automatically detecting unsafe conditions (wheel position beyond threshold, speed above threshold) and disabling pivot steering mode without operator intervention. This self-service capability ensures safe operation while keeping the system relatively simple.
Data Source
AI summary
A steering control system adapted for use on a paving machine having one or more wheels and an automatic pivot steer mode. The preferred steering control system comprises a speed sensor adapted to determine a paving machine speed, a steering cylinder adapted to move between a straight forward position and a fully turned position, a steering cylinder sensor adapted to determine a steering cylinder position, a flow sharing valve in fluid communication with one or more of the one or more wheels and adapted to be moved between an open position and a closed position, and a controller adapted to communicate with the speed sensor, the steering cylinder sensor, and the flow sharing valve. The preferred steering control system is adapted to automatically open and close the flow sharing valve. Automatically moving the flow sharing valve between the open position and the closed position.