Fuel Cell Vehicle Speed Control for Predicted Power Limits
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Solution Overview
Problem
Fuel cell vehicles face power shortages during steep ascents or intense heat, leading to sudden speed decreases due to insufficient power settings, which can reduce customer acceptance and require roadside assistance.
Innovation Solution
A method for operating a fuel cell vehicle that predicts running resistances, determines the performance capacity of the fuel cell and battery, and adjusts velocity to maintain a uniform speed by limiting power, considering environmental and traffic parameters, and iteratively updating speed adjustments based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell device operates at full power constantly, then the power availability is high, but the risk of damage to the fuel cell device or battery increases
Solution Approach 1:
The system performs preliminary determination of the state of charge and predictive determination of running resistances before actual power demand occurs. This allows the control to pre-adjust power settings and velocity curves to avoid sudden power drops while preventing damage through advance planning of power usage within safety boundaries.
Solution Approach 2:
The system dynamically changes operating parameters including velocity (Vsoll), power limits, and state of charge thresholds based on real-time conditions. By adjusting these parameters continuously rather than operating at fixed full power, the system maintains reliability while optimizing power availability for different driving conditions.
2Reliability
If the power is limited to avoid damage, then the reliability is improved, but the velocity and performance capacity decrease
Solution Approach 1:
The system implements dynamic velocity adjustment by determining a velocity curve (Vsoll) that varies continuously with driving conditions, state of charge, and predictive running resistances. This dynamic approach allows the vehicle to maintain optimal velocity within power limits rather than applying fixed speed restrictions, thereby improving both reliability and performance.
Solution Approach 2:
The system continuously monitors the state of charge, actual running resistances, and power consumption, then feeds this information back to adjust the velocity curve and power limits. This closed-loop feedback ensures that velocity restrictions are optimized in real-time to maintain reliability while minimizing performance impact.
3Reliability
If the initial power setting is insufficient for steep ascents, then the fuel cell device is protected from overload, but the customer acceptance decreases due to sudden speed decrease
Solution Approach 1:
The system performs predictive determination of running resistances using navigation data and weather information before the vehicle encounters difficult sections like steep ascents. This preliminary action allows the control to pre-adjust the velocity curve and power settings to ensure sufficient power availability is maintained throughout challenging road sections, preventing sudden speed drops that would reduce customer acceptance.
Solution Approach 2:
The system takes preliminary counter-actions by anticipating high resistance conditions and adjusting power delivery before the vehicle actually encounters the difficult section. By proactively managing power distribution and velocity curves in advance, the system prevents the adverse effect of sudden speed decrease while still protecting from overload through controlled power delivery.
4Power
If the velocity is adjusted to match power capacity, then the power availability is stabilized, but the productivity decreases due to reduced speed
Solution Approach 1:
The system optimizes the velocity curve (Vsoll) by continuously adjusting velocity parameters based on predictive running resistances, state of charge, and power capacity. This parameter optimization allows the vehicle to maintain higher velocities where power is available while smoothly reducing velocity only where necessary, thereby stabilizing power availability while minimizing the impact on overall productivity and travel time.
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 method prevents sudden power availability drops, ensuring a stable speed and reducing the need for speed reductions, thereby enhancing user experience and vehicle safety by optimizing power usage and battery health.
Implementation Method 1
the fuel, especially hydrogen H2 or a hydrogen-containing gas mixture, is supplied to the anode, where an electrochemical oxidation of H2 to H+ occurs, giving off electrons
Implementation Method 2
The cathode is supplied with oxygen or an oxygen-containing gas mixture, so that a reduction of O2 to O2− occurs, taking up electrons
Implementation Method 3
Through the electrolyte or the membrane which electrically insulates the reaction spaces and separates them from each other in a gas-tight manner, a transport of protons H+ occurs from the anode space to the cathode space
Data Source
AI summary
A method for operating a fuel cell vehicle includes predictive determining of the anticipated running resistances on an upcoming stretch of road, detecting of parameters determining the performance capacity of a fuel cell device and a battery, determining of a velocity Vsoll which can be maintained uniformly over the upcoming stretch of road with the anticipated running resistances, and limiting of the power provided by the fuel cell vehicle to the value required in order to achieve the velocity Vsoll.