Dynamic SOC Window Adjustment for Electric Vehicle Reverse Driving
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Solution Overview
Problem
Electrified vehicles face limitations in reverse driving range and power availability, especially during trailer towing events, due to the need for complex mechanical devices and limited battery state of charge (SOC) conditions.
Innovation Solution
A system and method that modify the SOC window of an electrified vehicle's battery pack by narrowing or widening it in response to reverse driving events or trailer towing events, using shift and trailer connection signals to adjust the SOC boundaries, thereby optimizing power availability and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrified vehicle uses battery power to drive the vehicle in reverse, then the vehicle can achieve reverse driving capability, but the travel range is limited at low battery state of charge conditions
Solution Approach 1:
The patent dynamically adjusts the SOC window boundaries based on detected driving conditions (reverse driving events, trailer towing events). The control system modifies the lower and upper SOC boundaries in real-time to expand available battery power during reverse driving, thereby resolving the contradiction between enabling reverse capability and maintaining sufficient travel range.
Solution Approach 2:
The patent changes the SOC window parameters (lower boundary, upper boundary) based on detected events. By adjusting these parameters dynamically, the system optimizes power availability for reverse driving while managing overall battery charge levels, thus resolving the contradiction between reverse driving capability and travel range.
2Reliability
If the SOC window is narrowed to maintain minimum SOC level, then battery durability is improved, but power availability during reverse driving is reduced
Solution Approach 1:
The system dynamically adjusts the SOC window width based on detected events. During normal operation, the window remains narrow to protect battery durability. During reverse driving events or trailer towing events, the window expands to provide sufficient power, thus resolving the contradiction between durability and power availability.
Solution Approach 2:
The control system preliminarily adjusts the SOC window boundaries before reverse driving begins by detecting shift device position or trailer connection signals. This preliminary action ensures sufficient power is available when reverse driving is needed, while maintaining narrow boundaries during normal operation to preserve battery durability.
3Duration of action of moving object
If the SOC window is widened to increase power availability, then reverse driving range is improved, but the risk of battery depletion increases
Solution Approach 1:
The patent selectively changes the SOC window parameters based on detected events. The lower boundary is adjusted to allow deeper discharge during reverse driving events, while the upper boundary and target SOC levels are managed to prevent overall battery depletion. This conditional parameter change resolves the contradiction between extending reverse driving range and maintaining battery reliability.
Data Source
AI summary
A method includes controlling an electrified vehicle by modifying a state of charge (SOC) window associated with an energy storage device of the electrified vehicle in response to a reverse driving event or a trailer towing event.