Fuel Cell Power Control for Route-Based Work Vehicle Loads
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Solution Overview
Problem
Existing range extender methods for work vehicles equipped with fuel cells and batteries fail to appropriately distribute energy due to fluctuating loads and travel routes, leading to inefficiencies in power management.
Innovation Solution
A control system that determines a target power generation amount for the fuel cell based on a time series of power measurement values while the work vehicle travels along a predetermined route, and adjusts the battery's charging or discharging accordingly to balance energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant power is output from the fuel cell at all times, then the power supply system is simplified, but the energy distribution becomes inappropriate under fluctuating load conditions
Solution Approach 1:
The fuel cell power output is changed from constant to dynamic, adjusting according to actual travel route characteristics and load conditions. The control system calculates required power based on route elevation changes, distance, and vehicle mass, then adjusts fuel cell output accordingly to match actual needs rather than maintaining fixed constant power.
Solution Approach 2:
The control system implements feedback by continuously monitoring travel route parameters, calculating required power, comparing with fuel cell output, and adjusting the fuel cell power command. This closed-loop control ensures energy distribution adapts to fluctuating loads while maintaining appropriate balance between fuel cell and battery usage.
2Loss of energy
If the fuel cell power is adjusted according to travel route, then the energy distribution efficiency is improved, but the control system complexity increases
Solution Approach 1:
The control system performs preliminary calculation of required power based on pre-acquired travel route information (elevation data, distance, vehicle mass) before actual power delivery. This advance preparation allows the system to determine optimal fuel cell power settings in advance, reducing real-time control complexity while maintaining energy efficiency.
Solution Approach 2:
The control system acts as an intermediary that processes travel route information and translates it into fuel cell power commands. By introducing this intermediate calculation layer that considers route characteristics, the system achieves efficient energy distribution without requiring direct complex interaction between fuel cell and battery controls.
3Device complexity
If the battery covers all power differences, then the fuel cell can operate at constant power, but the battery experiences excessive charging and discharging cycles
Solution Approach 1:
The fuel cell power output is dynamically adjusted to match actual travel requirements rather than remaining constant. This dynamic adjustment reduces the magnitude and frequency of power differences that the battery must compensate for, thereby reducing charging/discharging cycles and extending battery life while maintaining system simplicity.
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 control system effectively distributes the energy of the fuel cell and battery, ensuring that the work vehicle can maintain optimal power management even under fluctuating load conditions.
Implementation Method 1
a fuel cell that uses a hydrogen gas as a fuel
Implementation Method 2
the battery in order to suppress a mounted amount of the fuel cell and to absorb regenerative power
Data Source
AI summary
A power determination unit determines a target power generation amount of a fuel cell, based on a time series of measurement values relating to power while a work vehicle travels along a predetermined travel route. A fuel cell control unit controls the fuel cell to output the target power generation amount while the work vehicle travels along the travel route. A battery control unit controls charging or discharging of a battery, based on a difference between required power required for driving the work vehicle and the target power generation amount while the work vehicle travels along the travel route.