Refuse Truck Armrest Sensing for Lift and Pendent Control
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Solution Overview
Problem
Existing refuse trucks lack efficient control systems for managing the lift assembly and armrest positions, which can lead to operational inefficiencies and safety concerns during waste collection.
Innovation Solution
A refuse truck equipped with a control system that includes a pivotable armrest with a position sensor, a pendent control on the exterior, and cameras for monitoring the lift assembly and surroundings, allowing for precise control and automation of the lifting system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual control of lift assembly is used, then device complexity is reduced, but operational efficiency and precision deteriorate
Solution Approach 1:
The patent implements feedback mechanisms through position sensors that continuously monitor the armrest position and lift assembly status, providing real-time information to the control system. This enables automated adjustments and precise control of the lift assembly based on actual operational conditions, significantly improving operational efficiency while the control system manages the complexity.
Solution Approach 2:
The control system is designed to automatically manage lift assembly operations based on sensor inputs without requiring constant manual intervention. The system self-regulates by interpreting armrest position data and autonomously controlling lift assembly movements, thereby improving productivity while minimizing the need for complex manual control interfaces.
2Productivity
If automated control system is implemented, then operational efficiency is improved, but device complexity increases
Solution Approach 1:
The control system is designed with multi-functionality, integrating multiple control capabilities into a single unified system. It manages both armrest position monitoring and lift assembly control through integrated circuits and microprocessors, reducing the need for separate dedicated control systems and thereby limiting the increase in overall device complexity while maintaining high operational efficiency.
3Ease of operation
If armrest controls are always active, then ease of operation is improved, but safety deteriorates due to unintended activation
Solution Approach 1:
The patent implements dynamic control activation where the armrest controls are not permanently active but are selectively enabled based on detected armrest position. When the armrest is in the lowered position indicating operator presence, the controls become active; when raised, they are deactivated. This dynamic switching mechanism ensures ease of operation when needed while preventing unintended activation and improving safety.
4Ease of operation
If pendent control is always active, then ease of operation is improved, but reliability deteriorates due to accidental activation
Solution Approach 1:
The system uses feedback from armrest position sensors to dynamically control the activation state of pendent controls. The feedback mechanism ensures that pendent controls are only activated when the armrest is in the lowered position, confirming operator presence and intent. This prevents accidental activation when the operator is not present, thereby maintaining reliability while preserving ease of operation when needed.
Data Source
AI summary
A refuse truck includes a chassis, a body, a lift assembly coupled to the chassis and/or the body, a cab coupled to the chassis and positioned in front of the body, and a control system. The cab includes an armrest comprising controls pivotable between an active position and an inactive position and an armrest position sensor configured to determine a position of the armrest between the active position and the inactive position. The control system configured to control a user interface to provide an indication of a current position of the lift assembly. The control system further configured to determine a position of the armrest, and selectively activate a pendent control on an exterior of the body.