Rear-Docking Fuel Cell Trailer for Electric Bus Range Extension
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Solution Overview
Problem
Current electric buses, especially large business buses, face limitations in daily range due to battery degradation and the need for daily full charging, which is inadequate for long-distance routes, and existing fuel cell technologies struggle with efficiency and uptime.
Innovation Solution
A modular rear trailer docking type fuel cell system with a hydrogen tank configured as a stand-alone system, capable of independent operation, integrated with an electric bus to extend range and facilitate repair, using a trailer with doors for part replacement and optimized control systems for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a battery-only system is used for electric buses, then the bus can operate on short routes with overnight charging, but the daily range is limited to around 150 km and requires daily full charging which accelerates battery degradation
Solution Approach 1:
The system is divided into two independent power sources: a battery system for base operation and a fuel cell system for range extension. The fuel cell package is mounted on a separate detachable trailer that can be coupled to or decoupled from the bus, allowing the battery to handle short routes while the fuel cell provides additional range when needed, thereby extending daily range beyond 150 km without increasing battery size or charging frequency
Solution Approach 2:
The fuel cell trailer serves multiple functions: it acts as a range extender for the bus, provides standalone power generation capability, and can be used independently for other applications. The modular design allows the same fuel cell package to serve different purposes depending on whether it's coupled to a bus or operating independently, maximizing utility while solving the range limitation problem
2Length of moving object
If existing fuel cell technology is applied to buses, then range can be extended, but system efficiency decreases due to load fluctuations, start/stop operations, high power operation, and idling
Solution Approach 1:
The system implements dynamic load management where the fuel cell operates in optimized conditions by receiving variable power requests from the bus. The control system adjusts the fuel cell's power output based on real-time bus needs, allowing the fuel cell to operate more efficiently during steady-state conditions while still meeting the bus's varying power demands, thereby reducing energy loss during load fluctuations and idling
Solution Approach 2:
The battery system acts as an intermediary between the fuel cell and the bus load. It buffers the variable power demands of the bus, providing immediate response to load changes while allowing the fuel cell to operate in more stable, efficient conditions. This mediator role reduces the impact of start/stop operations and high power fluctuations directly on the fuel cell, minimizing energy loss
3Ease of repair
If a modular trailer design with doors is implemented, then repair and replacement of parts is facilitated, but device complexity increases
Solution Approach 1:
The trailer is divided into modular sections with front doors, side doors, and rear doors that provide independent access to different components. The fuel cell package itself is a self-contained module that can be replaced as a unit. This segmentation allows maintenance personnel to access specific parts without disassembling the entire trailer, facilitating easier repair and replacement despite the added structural complexity of multiple access points
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances the operational range and uptime of electric buses, enabling them to operate without external charging, supporting eco-friendly vehicle expansion and providing a mobile power generation capability for various applications.
Implementation Method 1
a fuel cell system capable of stand-alone operation using hydrogen fuel
Data Source
AI summary
The present invention aims to provide a rear trailer docking type trailer fuel cell system. The present invention is configured to comprise: a fuel cell package; a trailer for mounting the fuel cell package; and a trailer mounting unit for docking the trailer with the fuel cell package to a vehicle, and the fuel cell package comprises a hydrogen tank to be configured as a stand-alone system.