Vehicle Energy Storage Pulse Control for Thermal-Limited Ascents
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Solution Overview
Problem
Electrical energy storage systems face limitations in providing sufficient power during demanding ascents and descents due to electrochemical and thermal constraints, leading to rapid degradation and reduced lifespan.
Innovation Solution
A control strategy that calculates a recovery time window and adjusts speed parameters to ensure the electrical energy storage system can provide pulse power without exceeding thermal limits, using processing circuitry to optimize power usage based on terrain data and available power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electrical energy storage system provides high power during demanding ascents and descents, then the vehicle can maintain target speed, but the thermal limit is exceeded causing rapid degradation
Solution Approach 1:
The control strategy performs preliminary calculations of recovery time windows before demanding power events occur. The system proactively manages thermal state by scheduling rest periods in advance, allowing the electrical energy storage system to cool down before high power pulses are needed, thus preventing thermal limit exceedance and rapid degradation
2Duration of action of moving object
If the electrical energy storage system provides high power for extended periods, then the vehicle can sustain high performance, but the electrochemical pulse capability is depleted
Solution Approach 1:
The control strategy implements periodic action by alternating between high power pulse delivery and rest periods. The system calculates optimal pulse durations and intervening rest times to allow ion diffusion and recovery in the electrical energy storage system, maintaining pulse power capability across multiple cycles rather than continuous operation
3Speed
If the vehicle maintains target speed during power events, then the performance requirement is met, but the thermal limit of the electrical energy storage system is exceeded
Solution Approach 1:
The control strategy dynamically adjusts the vehicle speed profile based on real-time thermal state and calculated recovery time windows. Rather than maintaining a fixed target speed, the system optimizes speed dynamically to balance performance requirements with thermal management, ensuring the electrical energy storage system operates within safe temperature limits while still meeting performance goals
Data Source
AI summary
A computer system has processing circuitry to acquire terrain data of an upcoming power event for a host vehicle, calculate a total power required for traveling through the upcoming power event provided a target speed for the host vehicle, calculate, by adjusting a speed parameter for the host vehicle at the upcoming power event, a pulse power and pulse time available in the electrical energy storage system of the host vehicle to assist a speed adjusting device of the host vehicle during the upcoming power event to reach the total power, calculate a recovery time window prior to the upcoming power event that allows the electrical energy storage system to provide the pulse power and pulse time at the upcoming power event with the constraint that a thermal limit of the electrical energy storage system at the end of the upcoming power event is not exceeded, provide an output including the recovery time window, the pulse power, and the pulse time.