One-Pedal Deceleration Control for Wheel Slip Stability
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Solution Overview
Problem
In one-pedal-driving mode of vehicles, especially electric vehicles, there is a challenge in maintaining stable and predictable driving behavior due to excessive longitudinal wheel slip, which can lead to reduced driving stability and safety.
Innovation Solution
A method that monitors slip information for each wheel and reduces the deceleration level if the slip exceeds a predefined threshold, ensuring that the deceleration request is adjusted to prevent excessive wheel slip, thereby enhancing stability and predictability by reducing the deceleration level until the slip is minimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the deceleration level is increased to improve deceleration performance in one-pedal-driving mode, then the deceleration capability is improved, but longitudinal wheel slip increases which reduces driving stability
Solution Approach 1:
The control method continuously monitors wheel slip parameters and uses this feedback to dynamically adjust the deceleration level. When wheel slip exceeds a threshold, the system reduces the deceleration level to restore stability, creating a closed-loop control system that balances deceleration performance with driving stability.
Solution Approach 2:
The deceleration level is made dynamic rather than fixed, allowing it to change in real-time based on wheel slip conditions. The system transitions between different deceleration levels (first and second levels) depending on whether wheel slip thresholds are exceeded, enabling adaptive control that optimizes both deceleration capability and stability.
2Stability of the object's composition
If the deceleration level is reduced to minimize wheel slip and improve stability, then driving stability is improved, but the deceleration performance and responsiveness are degraded
Solution Approach 1:
The control system periodically evaluates wheel slip parameters and adjusts the deceleration level accordingly. By continuously monitoring and making periodic adjustments based on current slip conditions, the system maintains optimal stability while maximizing deceleration performance within safe limits.
Solution Approach 2:
The system changes the deceleration level parameter based on wheel slip conditions. When slip is within acceptable ranges, a higher deceleration level is used for better performance; when slip exceeds thresholds, the deceleration level is reduced to maintain stability, achieving adaptive optimization of both parameters.
3Stability of the object's composition
If the wheel slip threshold is set low to detect slip early and maintain stability, then driving stability is improved, but false triggering of deceleration reduction occurs reducing operational efficiency
Solution Approach 1:
The system sets predetermined wheel slip thresholds in advance that are optimized to detect genuine slip conditions without false triggering. These pre-calibrated thresholds enable early detection of actual slip events while filtering out normal variations, maintaining stability without unnecessarily reducing deceleration performance.
Solution Approach 2:
The control method uses simple, computationally inexpensive threshold comparisons rather than complex slip detection algorithms. This approach provides sufficient stability detection with minimal processing overhead, avoiding false positives while maintaining high operational efficiency through straightforward decision logic.
Data Source
Figure 1~2
AI summary
The disclosure relates to a method for controlling a deceleration request in a one-pedal-driving mode of a vehicle. The deceleration request relates to a deceleration level being a function of a position of a drive pedal (30). The method comprises receiving a slip information for each of the vehicle's wheels (12, 14) or for each of the vehicle's axles. Moreover, the method comprises comparing the slip information of each wheel (12, 14) to a predefined wheel slip threshold. Additionally, the method comprises triggering a reduction of the deceleration level of the deceleration request if the slip information of at least one wheel (12, 14) exceeds the predefined wheel slip threshold. Furthermore, a corresponding data processing apparatus (36), a corresponding computer program (44), and a corresponding computer-readable storage medium (42) are presented. Also, a drivetrain (16) for a vehicle (10) and a vehicle (10) are described.