Parallel Fuel Cell Modules for Hybrid Vehicle Reliability
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Solution Overview
Problem
Conventional fuel cell vehicles with serially connected fuel cells lack reliability due to the inability to maintain driving stability in emergencies, as a single malfunctioning fuel cell can shut down the entire system, and the use of supplementary power sources like supercapacitors is insufficient for long-term operation.
Innovation Solution
A hybrid fuel cell vehicle with multiple power sources connected in parallel and multiple drive systems, where the primary power sources share a single main bus terminal, and an auxiliary power source is used to supplement power, allowing for independent operation of each power source and drive system to ensure continued functionality in case of failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fuel cells are connected in series to increase voltage output, then power generation capability is improved, but system reliability deteriorates because a single malfunction shuts down the entire system
Solution Approach 1:
The fuel cell system is divided into multiple independent modules (first fuel cell module, second fuel cell module, etc.) that can operate independently. Each module has its own control unit and can be disconnected from the others through contactors, allowing the system to maintain power generation even when one module fails.
Solution Approach 2:
The system dynamically changes its electrical configuration between series connection (for high voltage/power output during normal operation) and parallel or disconnected states (for reliability during emergencies). Control units monitor module health and reconfigure connections to maintain optimal performance while ensuring reliability.
2Device complexity
If a single large-sized motor is used to reduce component count, then device complexity is reduced, but reliability deteriorates due to lack of redundancy in emergency situations
Solution Approach 1:
The drive system is segmented into multiple independent motors (first motor, second motor, third motor) instead of using a single large motor. Each motor can operate independently to drive the vehicle, providing redundancy and ensuring driving stability even when one motor fails.
Solution Approach 2:
Multiple motors are combined to work together as a unified drive system, sharing common control and power distribution infrastructure. This merging approach provides redundancy while avoiding the complexity of completely separate systems, as all motors can coordinate through a central control unit.
3Speed
If speed reduction ratio is decreased to increase vehicle speed, then maximum speed is improved, but climbing performance deteriorates
Solution Approach 1:
The system uses dynamic control of multiple motors with independent torque management to adapt to different driving conditions. The control unit can optimize the speed-reduction ratio and torque distribution in real-time, allowing the vehicle to achieve both high speed and strong climbing performance without being constrained by a fixed mechanical gear ratio.
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
This configuration enhances driving stability and performance by allowing continued operation even if one power source or drive system fails, reduces material costs, and improves climbing, acceleration, and overtaking capabilities while maintaining existing output power levels.
Implementation Method 1
A fuel cell system is a power generation system that directly converts chemical energy of fuel into electrical energy, in which a pair of electrodes including an anode and a cathode is disposed on both sides of an electrolyte membrane such that electricity and heat are produced by an electrochemical reaction of ionized gas.
Implementation Method 2
The supercapacitor 120 serves as an auxiliary power source capable of rapidly charging and discharging high power.
Data Source
AI summary
A hybrid fuel cell vehicle with a multi-power source and a multi-drive system includes: a plurality of primary power sources sharing a single main bus terminal and connected in parallel to each other; a plurality of drive systems receiving power from the main bus terminal to generate output torque so as to drive vehicle wheels and connected in parallel to each other; and an auxiliary power source sharing the main bus terminal and disposed between the primary power sources and the drive systems to supplement power shortage of the primary power sources.