Automated Pack Panel Ejection Control for Refuse Vehicles
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Solution Overview
Problem
Conventional refuse vehicle ejection procedures are manually controlled, leading to imprecise control of the pack panel and potential refuse falling behind it during the ejection process.
Innovation Solution
A refuse vehicle equipped with an ejection input that automatically initiates an ejection procedure, using a packing actuator to sequentially extend a pack panel to predefined positions, ensuring refuse remains in front of the panel and preventing it from falling behind.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual control is used for ejection procedure, then operator flexibility is maintained, but control precision deteriorates leading to refuse falling behind the pack panel
Solution Approach 1:
The system performs self-control through automated detection and execution. The controller automatically monitors tailgate position via sensor and executes the ejection sequence without manual intervention, allowing the system to serve itself in maintaining precise control while reducing operational complexity
Solution Approach 2:
The tailgate sensor provides continuous feedback to the controller about tailgate position. This feedback mechanism enables the controller to make real-time decisions about when to initiate and stop the ejection procedure, ensuring precise control of the pack panel movement and preventing refuse from falling behind
2Reliability
If automated ejection procedure is implemented, then control precision is improved, but device complexity increases due to additional sensors and controllers
Solution Approach 1:
The controller serves multiple functions: it monitors tailgate position via the sensor, determines when to initiate ejection, controls the packing actuator during ejection, and prevents unauthorized operation when the tailgate is closed. This multi-functionality consolidates control logic into a single component, reducing overall system complexity while maintaining high reliability
Solution Approach 2:
The system performs preliminary verification of tailgate position through the sensor before allowing ejection to occur. This preliminary action ensures that all safety conditions are met before the ejection sequence begins, improving reliability by preventing operation under unsafe conditions while using a simple sensor-based check
3Productivity
If the pack panel is extended quickly to full position, then ejection speed is increased, but refuse may fall behind the panel during rapid movement
Solution Approach 1:
The ejection sequence is segmented into multiple discrete steps with the pack panel extending to different positions (first position, second position, third position, etc.). This segmentation allows the system to move refuse in controlled increments, maintaining precision while achieving overall productivity through automated sequential operation
Solution Approach 2:
The packing actuator performs periodic extension and retraction cycles during the ejection procedure. The panel extends to a target position, holds briefly to allow refuse to settle, then retracts slightly before the next extension cycle. This periodic action prevents refuse from falling behind while maintaining efficient ejection throughput
Data Source
AI summary
A refuse vehicle includes a chassis, a cab coupled to the chassis, a refuse compartment supported by the chassis and having a storage volume and a hopper volume, a packing assembly including a pack panel and a packing actuator, and an ejection input configured to automatically initiate an ejection procedure upon activation of the ejection input. The packing actuator is configured to selectively move the pack panel between a retracted position and an extended position. The ejection procedure includes extending the pack panel to a plurality of extended positions between the retracted position and the extended position.