Tractor Scraper Engagement Control via Sensor Feedback
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Solution Overview
Problem
Machines like wheel tractor scrapers often lack sufficient power or traction to efficiently engage with the work surface during material loading operations, necessitating assistance from a second machine, such as a dozer, which requires coordinated engagement to optimize efficiency and avoid sudden impacts.
Innovation Solution
A system comprising a separation sensor, a relative speed sensor, and a controller that determines the separation distance and speed difference between machines, generating deceleration and engagement commands to control the engagement process, ensuring smooth and efficient coordination between the wheel tractor scraper and the dozer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a second machine is used to push the wheel tractor scraper to assist in loading, then the power and traction for engaging the work surface is improved, but the risk of sudden impacts and the complexity of coordination between machines increases
Solution Approach 1:
The control system performs preliminary actions by detecting the approach of the second machine and initiating deceleration of the first machine before physical engagement occurs. The system uses sensors to monitor separation distance and activates braking protocols in advance, ensuring the first machine is already decelerating when the second machine arrives, thereby preventing sudden impacts while maintaining coordinated power delivery.
Solution Approach 2:
The system continuously monitors the separation distance between machines using sensors and adjusts the deceleration rate in real-time based on this feedback. When the separation distance falls within a predetermined deceleration zone, the system automatically applies braking force proportional to the closing speed, creating a closed-loop control system that prevents impacts while optimizing the assistance provided by the second machine.
2Object-affected harmful factors
If the first machine decelerates automatically when the second machine approaches, then the impact between machines is reduced, but the coordination complexity and control system requirements increase
Solution Approach 1:
The first machine's control system autonomously manages its own deceleration without requiring complex external coordination. The onboard sensors detect the approach of the second machine and automatically trigger the braking system, allowing the first machine to self-regulate its speed and positioning. This self-service approach reduces the need for sophisticated inter-machine communication systems while still achieving smooth engagement.
Solution Approach 2:
The control system dynamically adjusts the deceleration rate parameter based on the detected separation distance and relative speed. Rather than using a fixed deceleration profile, the system modulates the braking force as a variable parameter that responds to real-time conditions, simplifying the control logic while achieving adaptive impact reduction across different operating scenarios.
3Productivity
If the separation distance and speed are continuously monitored, then the engagement coordination is optimized, but the measurement and control requirements become more stringent
Solution Approach 1:
The system monitors separation distance and speed parameters selectively rather than continuously at maximum precision. Deceleration is activated when the separation distance enters a predetermined zone, and the deceleration rate is adjusted based on whether the closing speed exceeds a threshold. This partial monitoring approach achieves sufficient coordination efficiency without requiring continuous high-precision measurement of all parameters.
Data Source
AI summary
A system for controlling an engagement operation between first and second movable machines includes a separation sensor, a relative speed sensor and a controller. The separation sensor determines a separation distance between the first and second machines. The relative speed sensor determines a relative difference in speed between the first and second machines. The controller determines the separation distance between the first and second machines, decelerates the first movable machine when the separation distance is within a deceleration zone, determines a relative difference in speed between the first and second machines, and generates an engagement speed command to operate the first movable machine at a first ground speed equal to a second ground speed of the second movable machine plus a relative engagement speed when the separation distance is within a buffer zone.