Outside Air Temperature Correction for Electric Vehicle RESS
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Solution Overview
Problem
Existing methods for maintaining the temperature of rechargeable energy storage systems (RESS) in electric vehicles, such as batteries, often result in inaccurate outside air temperature measurements due to heat expulsion during thermal conditioning cycles, affecting vehicle control and energy efficiency.
Innovation Solution
A control system that includes an outside air temperature (OAT) sensor and a control module, which stores a chosen OAT based on data from the OAT sensor and the RESS cooling cycle, allowing for accurate vehicle control during RESS cooling cycles, thereby mitigating the inaccuracy caused by heat expulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the RESS cooling cycle operates to maintain battery temperature, then thermal management is improved, but outside air temperature measurement accuracy deteriorates due to heat expulsion near the sensor
Solution Approach 1:
The control module proactively identifies when a RESS cooling cycle is active and preemptively selects a different OAT data source or applies a correction factor before the heat expulsion affects the primary OAT sensor measurements, thereby maintaining measurement accuracy throughout the cooling process
Solution Approach 2:
The control module introduces an intermediary selection mechanism that chooses between multiple OAT data sources (primary sensor, secondary sensor, or corrected values) based on the operational state of the RESS cooling cycle, ensuring accurate temperature data is used for vehicle control decisions
2Speed
If the vehicle uses real-time OAT sensor data for control decisions, then responsiveness is improved, but control accuracy deteriorates during RESS cooling cycles due to artificial OAT rises
Solution Approach 1:
The control module continuously monitors the operational state of the RESS cooling cycle and uses this feedback to dynamically adjust the OAT data selection strategy, switching between different data sources or applying corrections based on the current cooling cycle status to maintain both responsiveness and accuracy
Solution Approach 2:
The system pre-identifies periods when RESS cooling cycles are active and prepares appropriate OAT data alternatives in advance, ensuring that accurate temperature data is immediately available for control decisions without delay, thus maintaining both responsiveness and reliability
3Measurement precision
If the vehicle wakes up frequently to check OAT conditions, then control precision is improved, but energy consumption increases due to unnecessary wake-ups during artificial OAT rises
Solution Approach 1:
The control module introduces an intermediary intelligence layer that analyzes the operational context (RESS cooling cycle status) before triggering wake-up events, filtering out false alarms caused by artificial OAT rises during cooling and only initiating wake-ups when genuine OAT threshold violations occur, thereby reducing unnecessary energy consumption while maintaining control precision
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 solution ensures accurate outside air temperature measurements, reduces unnecessary vehicle wake-ups, and optimizes energy use by proactively addressing artificial OAT rises during RESS cooling cycles, enhancing the overall thermal management of electric vehicles.
Implementation Method 1
an outside air temperature (OAT) sensor
Implementation Method 2
A typical RESS conditioning cycle may expel heat in the area of an outside air temperature sensor
Data Source
AI summary
Methods, control systems, and vehicle are provided for controlling a vehicle that has a rechargeable energy storage system (RESS). A method includes storing with a control module a chosen outside air temperature (OAT) that is based on data from an OAT sensor and a cooling cycle of the RESS, and controlling the vehicle with the chosen OAT when a cooling cycle of the RESS is indicated. The control system and vehicle include control modules configured to perform the method.