Fuel Cell Vehicle Battery SOC Control Under Fuel Cell Deterioration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cell vehicles face issues with battery overcharging or overdischarging, leading to reduced fuel efficiency and acceleration performance due to restricted regenerative braking, which existing technologies fail to adequately address.
Innovation Solution
A battery control system and method that estimates the degree of fuel cell deterioration to derive the state of charge (SOC) value of the battery, adjusting charge and discharge control factors to prevent overcharging or overdischarging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery SOC is strictly controlled within fixed limits to prevent overcharging or overdischarging, then battery safety and durability are improved, but regenerative braking is restricted and fuel efficiency deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of battery charge and discharge control factors based on real-time fuel cell deterioration degree. Instead of using fixed SOC limits, the system continuously adapts control parameters (charge control factor and discharge control factor) according to the deteriorating fuel cell performance, allowing flexible expansion of regenerative braking opportunities while preventing battery overcharging or overdischarging.
Solution Approach 2:
The system changes control parameters (charge control factor and discharge control factor) based on fuel cell deterioration degree. As the fuel cell deteriorates, the control factors are adjusted to modify the battery's charge and discharge behavior, enabling the system to optimize energy recovery from regenerative braking while maintaining battery safety under varying operating conditions.
2Reliability
If regenerative braking is frequently restricted due to battery SOC limits, then battery overcharging is prevented, but energy recovery is reduced and fuel efficiency worsens
Solution Approach 1:
The system dynamically adjusts the charge control factor based on fuel cell deterioration degree and current battery SOC. This dynamic control allows the system to maximize regenerative braking energy recovery by adapting charge acceptance limits in real-time, preventing premature restriction of regenerative braking while ensuring battery durability through continuous monitoring and adjustment.
Solution Approach 2:
The system uses feedback from battery SOC measurements and fuel cell deterioration assessment to continuously adjust charge and discharge control factors. This closed-loop control enables the system to optimize energy recovery by allowing regenerative braking when conditions permit while preventing battery overcharging, thereby improving both energy efficiency and battery durability.
3Loss of energy
If the battery charge control factor is increased to maximize energy recovery, then fuel efficiency is improved, but the risk of battery overcharging increases
Solution Approach 1:
The system adjusts the charge control factor based on fuel cell deterioration degree and current battery SOC conditions. By dynamically modifying this parameter, the system can increase energy recovery potential when the battery has capacity to accept charge, while reducing the charge control factor when the battery approaches full charge, thereby preventing overcharging while maximizing fuel efficiency improvements from regenerative braking.
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
Stabilizes the SOC value of the battery, preventing overcharging or overdischarging, thereby maintaining fuel efficiency and acceleration performance by dynamically adjusting charge and discharge controls based on fuel cell deterioration and driving patterns.
Implementation Method 1
a fuel cell disposed in a fuel cell vehicle is a device that generates electrical energy through an electrochemistry reaction inside a fuel cell stack by receiving hydrogen and air from external sources
Implementation Method 2
when a vehicle is gliding or the brake pedal is pressed, power that has been supplied to the motor is cut off but counter electromotive force is generated from the motor by wheels rotating due to the inertia of the moving vehicle
Data Source
AI summary
A battery control system and method of a fuel cell vehicle includes a battery, a fuel cell, and a controller. The battery provides driving energy of a vehicle. The fuel cell provides the driving energy of the vehicle or charging the battery. The controller estimates a degree of deterioration of the fuel cell, derive a change rate in an SOC value of the battery based on the degree of deterioration of the fuel cell, and change a charge control factor or a discharge control factor of the battery according to the derived change rate in the SOC value of the battery.