Fuel Cell Vehicle Output Control for Battery Charge Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cell vehicles face inefficiencies in output distribution between fuel cells and batteries, with existing methods not adequately considering fuel cell output efficiency, leading to suboptimal driving performance and accessory consumption.
Innovation Solution
A fuel cell vehicle system that includes a controller determining a load demanded output value and assessing conditions for overcharge and over-discharge, allowing for constant output operation based on fuel cell efficiency, thereby optimizing fuel cell output and reducing accessory consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output of the fuel cell is determined based only on the distribution conditions, then the electric energy distribution between fuel cell and battery is optimized, but the output efficiency of the fuel cell itself deteriorates
Solution Approach 1:
The patent changes the control parameter from simple distribution-based output determination to efficiency-based output determination. The controller determines the fuel cell output based on the output efficiency map, which maps the relationship between output power and efficiency, thereby optimizing the fuel cell operating point to maintain high efficiency while meeting power distribution requirements.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the fuel cell output efficiency and adjusting the fuel cell output accordingly. The controller uses the output efficiency information to regulate the fuel cell operating point, creating a closed-loop control system that maintains optimal efficiency while satisfying power distribution needs.
2Loss of energy
If the constant output operation section of the fuel cell is enlarged, then the output efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing an output efficiency map that contains the relationship between fuel cell output power and efficiency characteristics. This map is determined in advance through testing or simulation, allowing the controller to directly query optimal operating points without complex real-time calculations, thereby simplifying the control system while maintaining high efficiency.
Solution Approach 2:
The patent uses partial action by implementing constant output control only in the constant output operable section where it is most beneficial. The controller determines whether to apply constant output control based on current operating conditions, applying this control strategy selectively rather than universally, which balances efficiency improvement with control complexity.
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 driving efficiency by enlarging the constant output section of the fuel cell, minimizing output fluctuations, and reducing fuel cell accessory consumption, thereby improving overall fuel efficiency.
Implementation Method 1
a fuel cell that generates electrical energy through a reaction between hydrogen and oxygen
Data Source
AI summary
A fuel cell vehicle includes: a fuel cell; a battery; and a controller that determines a load demanded output value. In particular, the controller determines whether a first condition related to overcharge of the battery and a second condition related to over-discharge of the battery are satisfied based on the load demanded output value, and further determines whether a constant output is operable based on an output efficiency of the fuel cell when the first and second conditions are satisfied. The controller controls an output of the fuel cell according to a result of the determination.