One-Pedal Deceleration Control for Vehicle Stability Limits
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Solution Overview
Problem
In one-pedal-driving mode, vehicles experience instability and unpredictable handling due to increased longitudinal forces on wheels, especially in low-friction conditions or high lateral acceleration, requiring non-intuitive driver input to manage deceleration.
Innovation Solution
A method that adjusts deceleration levels based on vehicle stability information, reducing deceleration when stability thresholds are exceeded, using sensors and models to maintain stability and predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high deceleration levels are requested by one-pedal-driving, then deceleration performance is improved, but vehicle stability deteriorates due to increased longitudinal forces on wheels
Solution Approach 1:
The system dynamically adjusts the deceleration level based on real-time wheel slip detection. When wheel slip is detected, the deceleration level is reduced to prevent instability; when wheel slip is absent, the full deceleration level is maintained for optimal performance. This dynamic adaptation resolves the contradiction between maintaining high deceleration performance and ensuring vehicle stability.
Solution Approach 2:
The system implements a feedback mechanism by continuously monitoring wheel slip conditions and using this information to adjust the deceleration request. The control unit receives wheel slip information and modifies the deceleration level accordingly, creating a closed-loop control system that balances deceleration performance with vehicle stability.
2Stability of the object's composition
If deceleration level is reduced to maintain stability, then vehicle stability is improved, but deceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts the deceleration level based on real-time wheel slip detection. When wheel slip is detected, the deceleration level is reduced to prevent instability; when wheel slip is absent, the full deceleration level is maintained for optimal performance. This dynamic adaptation resolves the contradiction between maintaining high deceleration performance and ensuring vehicle stability.
Solution Approach 2:
The system changes the deceleration parameter dynamically based on wheel slip conditions. By adjusting the deceleration level parameter in response to detected wheel slip, the system optimizes the balance between stability and performance without requiring permanent system changes.
3Stability of the object's composition
If driver presses drive pedal to reduce deceleration request, then vehicle stability is improved, but ease of operation deteriorates due to non-intuitive driver input
Solution Approach 1:
The system performs self-correction by automatically detecting wheel slip and adjusting the deceleration level without driver intervention. The control unit monitors wheel slip conditions and modifies the deceleration request autonomously, eliminating the need for the driver to perform non-intuitive actions to maintain stability.
Solution Approach 2:
The system implements a feedback mechanism by continuously monitoring wheel slip conditions and using this information to adjust the deceleration request automatically. This closed-loop control eliminates the need for driver intervention, resolving the contradiction between maintaining stability and ease of operation.
4Stability of the object's composition
If activation of antilock braking system or stability control system occurs, then vehicle stability is improved, but driving comfort deteriorates due to significant driver discomfort
Solution Approach 1:
The system takes preliminary action by detecting wheel slip early and reducing the deceleration level before the vehicle enters an unstable state that would trigger antilock braking or stability control systems. This preventive approach maintains stability while avoiding the driver discomfort associated with activating these corrective systems.
Solution Approach 2:
The control unit performs preliminary adjustment of the deceleration level upon detecting wheel slip, preventing the development of severe instability that would require activation of antilock braking or stability control systems. This early intervention maintains both stability and driving comfort.
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 (10), the deceleration request comprising a deceleration level being a function of a position of a drive pedal (12) of the vehicle (10), the method comprising: receiving a vehicle stability information, the vehicle stability information being indicative for the driving stability of the vehicle (10), comparing the vehicle stability information to a vehicle stability information threshold, and triggering a reduction of the deceleration level of the deceleration request if the vehicle stability information exceeds the vehicle stability threshold. Furthermore, the disclosure relates to a corresponding computer program product (26), a corresponding data processing apparatus (20), and a corresponding vehicle (10).