One-Pedal Drive Deceleration Control on Slippery Roads
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Solution Overview
Problem
One-pedal drive systems in electric vehicles may cause safety issues by providing unexpected strong deceleration on low-friction roads and are prone to instability due to accidental pedal release, especially when drivers unconsciously lift their foot off the pedal.
Innovation Solution
A method and control unit for a vehicle actuator that adjusts its mode based on slippery road conditions detected by sensors and machine learning, allowing proactive switching between standard, low, and special modes or deactivation to manage deceleration levels, providing haptic warnings and alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the OPD applies strong deceleration from disengaging the accelerator pedal, then energy recovery efficiency is improved, but vehicle stability deteriorates on low-friction roads
Solution Approach 1:
The system dynamically adjusts the deceleration strength of the one-pedal drive actuator based on real-time road friction detection. When low friction is detected, the system reduces deceleration intensity to prevent wheel slip and maintain stability, while still providing energy recovery. This dynamic adaptation resolves the contradiction between maximizing energy recovery and maintaining vehicle stability on varying road surfaces.
Solution Approach 2:
The system changes the deceleration parameter (braking force) based on detected road conditions. By monitoring road friction coefficients and adjusting the actuator's deceleration strength accordingly, the system optimizes the balance between energy recovery efficiency and vehicle stability, preventing excessive deceleration on low-friction surfaces while maintaining strong recovery on high-friction surfaces.
2Power
If the actuator provides strong deceleration capability, then braking performance is improved, but safety deteriorates due to unexpected deceleration on slippery roads
Solution Approach 1:
The system performs preliminary detection of road friction conditions before the driver releases the accelerator pedal. By proactively identifying low-friction road segments ahead, the system pre-adjusts the deceleration strength to appropriate levels, preventing unexpected strong braking that could compromise safety. This preliminary action ensures the actuator delivers optimal braking performance matched to actual road conditions.
Solution Approach 2:
The system continuously monitors road friction conditions and provides feedback to adjust the actuator's deceleration output. This closed-loop control ensures that braking performance is optimized for current road conditions while preventing unsafe deceleration on slippery surfaces, thereby maintaining both high power capability and safety reliability.
3Stability of the object's composition
If the system deactivates the actuator on slippery roads, then vehicle stability is improved, but energy recovery capability deteriorates
Solution Approach 1:
Instead of completely deactivating the actuator on slippery roads, the system applies partial deceleration force that is sufficient to maintain stability while still providing some energy recovery. This partial action approach allows the system to preserve vehicle stability on low-friction surfaces without fully sacrificing energy recovery capability, optimizing the trade-off between these two competing requirements.
Data Source
AI summary
Method for controlling an actuator of a vehicle configured to operate in a standard mode, a low mode, and a special mode, or be deactivated, receive an actuator request, and control acceleration and deceleration of the vehicle based on the actuator request, where the deceleration is controlled by setting the actuator in one of the standard, low and special mode, or by deactivating the actuator, the method including obtaining first data indicative of a slippery condition of at least one of an upcoming road segment to be travelled by the vehicle or a current road segment being travelled by the vehicle; and based on the first data, switching the actuator from a previous setting to a current setting, where the previous and the current settings are different and include setting the actuator in one of the standard, low and special mode or deactivating the actuator.