EV Battery Power Limit Control by Driving Mode
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Solution Overview
Problem
Existing battery control systems in electrified vehicles do not adequately address the varying demands on battery life based on different driving modes, such as auto cruise, following, autonomous, and manual driving, leading to potential reductions in battery life due to differing power input and output requests.
Innovation Solution
A control device that determines the driving mode and sets distinct upper limits on electricity input and output based on the level of driver involvement, with lower limits for autonomous driving to reduce temperature rise and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the upper limit of electricity input and output from the battery is increased to meet high power demands, then the vehicle's power performance is improved, but the battery temperature rises and battery life is reduced
Solution Approach 1:
The patent implements dynamic adjustment of battery power limits based on driving mode. The control device switches between a first upper limit (lower) for autonomous driving mode and a second upper limit (higher) for manual driving mode, allowing the system to adapt power output capabilities to actual operational requirements while preventing unnecessary temperature rise
2Duration of action of stationary object
If the upper limit of electricity input and output from the battery is decreased to suppress temperature rise, then battery life is extended, but the vehicle's power performance is reduced
Solution Approach 1:
The control device dynamically adjusts the battery power upper limit based on the detected driving mode. When manual driving mode is detected, the higher second upper limit is applied to maintain power performance. When autonomous driving mode is detected, the lower first upper limit is applied to extend battery life by suppressing temperature rise, thus resolving the contradiction between power performance and battery longevity
3Device complexity
If a single upper limit is set for battery electricity input and output, then the control system is simple, but it cannot adapt to different driving modes affecting battery life
Solution Approach 1:
The patent introduces a driving mode detection mechanism that enables the control system to automatically select between two different upper limits based on the current operating mode. This dynamic adaptation allows the system to optimize battery life for autonomous driving while maintaining power performance for manual driving, achieving versatility without excessive complexity
Solution Approach 2:
The control device changes the battery power limit parameter according to the detected driving mode. By switching between the first upper limit and second upper limit based on mode detection, the system adapts to different operational requirements, improving battery life management while maintaining responsiveness to driver needs
Data Source
AI summary
In an electrified vehicle of traveling using a battery, it is determined whether the driving mode of the vehicle is a first driving mode in which the driver's involvement in the traveling of the vehicle is low, or a second driving mode in which the driver's involvement is higher than the first driving mode. When it is determined that the driving mode is the first driving mode, the upper limit of the amount of electricity per unit time of entering and leaving the battery is set to the first upper limit amount lower than the second upper limit amount that is the upper limit set in the second driving mode. Then, the amount of electricity entering and leaving the battery is controlled within a range that does not exceed the first upper limit amount or the second upper limit amount set in accordance with the driving mode.