Fuel Cell Preheating Control Using Predicted Vehicle Start Timing
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Solution Overview
Problem
Existing cold start control methods for fuel cell vehicles rely on driver-initiated start attempts, leading to inefficient driving due to low responsiveness and reduced output performance at the early stage of starting, as they maximize fuel cell stack temperature using heaters or low-efficiency operations.
Innovation Solution
A system that collects and analyzes driver start pattern information to estimate a predicted start time, classifying days, positions, and times to preheat the fuel cell, using a controller to manage temperature increase based on these patterns, ensuring efficient preheating before the vehicle is started.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cold start control is performed based on driver-initiated start attempts using heaters or low-efficiency operations, then the fuel cell stack temperature is maximized, but the output performance is reduced at the early stage of starting due to low responsiveness
Solution Approach 1:
The system performs preliminary classification of start pattern information (weekday/weekend groups, position groups, time groups) and deduces predicted next start time in advance, enabling preheating control before the actual start attempt. This preliminary action allows the fuel cell to reach optimal temperature before the driver actually starts the vehicle, resolving the contradiction between temperature maximization and output performance.
Solution Approach 2:
The control strategy dynamically adjusts based on the deduced predicted next start time. When the current time is before the predicted start time and the fuel cell temperature is below the target temperature, the system operates in preheating mode with different control parameters than when the predicted start time has passed. This dynamic adjustment optimizes both temperature control and output performance at different stages.
2Temperature
If the fuel cell stack temperature is maximized using heaters, then frozen moisture is thawed, but the load of accessories is maximized and power consumption increases
Solution Approach 1:
By classifying start pattern information and deducing the predicted next start time in advance, the system can initiate preheating control before the actual start. This preliminary action allows the fuel cell to be warmed up during periods when power demand is lower, reducing the peak load on accessories and overall power consumption while still achieving the necessary temperature for operation.
Solution Approach 2:
The system uses the fuel cell's own electrochemical reactions to generate heat for warming up the stack during preheating control, rather than relying solely on external heaters. This self-service approach reduces dependency on high-power accessory loads and optimizes energy efficiency while maintaining temperature control.
3Device complexity
If cold start control is performed only when the vehicle is started, then the control logic is simple, but the start point in time cannot be estimated independently of driver attempt
Solution Approach 1:
The system performs preliminary classification of start pattern information into weekday/weekend groups, position groups, and time groups, then deduces the predicted next start time in advance. This preliminary analysis enables independent estimation of the start point in time without waiting for the driver's actual start attempt, improving start time estimation accuracy while maintaining manageable control logic through structured data organization.
4Temperature
If preheating control is performed by estimating predicted next start time, then the fuel cell can be preheated in advance, but the control system requires classification and analysis of start pattern information
Solution Approach 1:
The system segments start pattern information into distinct categories: weekday/weekend groups, position groups, and time groups. This segmentation simplifies the classification and analysis process by organizing data into manageable segments, enabling effective preheating control through structured information processing rather than handling raw data as a single complex entity.
Solution Approach 2:
The classification of start pattern information and deduction of predicted next start time are performed as preliminary actions before actual preheating control. This preliminary processing organizes the data structure and identifies key parameters in advance, reducing the complexity of the subsequent temperature control execution phase while achieving effective preheating.
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
Enables independent estimation of cold start timing, allowing for higher temperature starts and avoiding inefficient driving sections by optimizing temperature increase to meet predetermined targets, thus ensuring sufficient preheating time.
Implementation Method 1
a fuel cell stack in which a plurality of fuel cells used as a power source are stacked on each other... generates electric energy by electrochemical reactions inside a fuel cell stack by using hydrogen and oxygen
Implementation Method 2
a method of thawing frozen moisture inside the fuel cell stack by operating a heater using power from a high voltage battery
Data Source
AI summary
Proposed are a system for preheating a fuel cell for a fuel cell vehicle and a method controlling the system. An information collector collects start pattern information regarding a start pattern of a driver including start dates, positions, and times of a fuel cell vehicle when the vehicle is started. A controller classifies a start date in the start pattern information of the driver as a weekday group or a weekend group, classifies a start position in which the start of the vehicle is concentrated as a position group, classifies a start time in which the start of the vehicle is concentrated as a time group, deduces a predicted next start time based on each group when the vehicle is stopped, and controls a temperature increase of a fuel cell based on the predicted next start time when the fuel cell is stopped.