Refuse Vehicle HVPDU Platform Layout for Safe Service Access
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Solution Overview
Problem
Existing refuse vehicles with electrical energy systems face challenges in safely accessing and protecting high voltage power distribution units (HVPDUs) due to the complexity and potential hazards associated with their electrical components, particularly when maintenance or service is required.
Innovation Solution
A refuse vehicle design that includes a platform removably coupled to the chassis and HVPDU, which encloses the high voltage power distribution unit and is configured to prevent user contact with cables, with a manual service disconnect accessible via a wheel well through hole covered by a flap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the manual service disconnect is placed inside the HVPDU for protection, then safety is improved, but accessibility for maintenance deteriorates
Solution Approach 1:
The HVPDU enclosure is segmented into multiple access points: a primary service access through the wheel well for manual service disconnect, and additional access points on opposite sides of the vehicle. This segmentation allows different components to be accessed independently without requiring full disassembly, resolving the contradiction between protection and accessibility.
Solution Approach 2:
A removable panel or door is introduced as an intermediary element between the external environment and the HVPDU internal components. This intermediary provides a controlled access path that maintains safety when closed while enabling maintenance when opened, allowing the manual service disconnect to remain protected yet accessible.
2Reliability
If the HVPDU is enclosed in a platform to prevent user contact with cables, then safety is improved, but device complexity increases
Solution Approach 1:
The platform serving as the HVPDU enclosure is designed to perform multiple functions: it provides structural support for the HVPDU, acts as a protective enclosure, serves as a mounting surface for access panels, and functions as part of the vehicle's floor structure. This multi-functionality reduces the need for separate protective structures, thereby reducing overall device complexity while maintaining safety.
Solution Approach 2:
The protective enclosure for the HVPDU is merged with the vehicle platform structure rather than being a separate additive component. By combining the enclosure function with the existing platform, the design avoids adding unnecessary structural complexity while achieving the safety goal of preventing user contact with high voltage cables.
3Ease of repair
If access points are provided on multiple sides of the vehicle, then maintenance ease is improved, but structural complexity increases
Solution Approach 1:
The enclosure is divided into multiple independent access panels located on different sides of the vehicle. Each panel can be opened independently to access specific components, allowing maintenance personnel to work from the most convenient side without affecting other parts of the structure. This segmentation enables easy maintenance while using simple, modular panel designs that don't significantly increase structural complexity.
Data Source
AI summary
A refuse vehicle includes a cab, a refuse compartment, a chassis, a high voltage power distribution unit (HVPDU) including a battery, a plurality of cables and a manual service disconnect. The manual service disconnect is accessed via a through hole of a wheel well of the refuse vehicle. The refuse vehicle further includes a platform removably coupled to the chassis and the HVPDU and configured to enclose the high voltage power distribution unit.