Vehicle Traction Control Wheel Slip Management
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Solution Overview
Problem
Drivers face challenges in controlling wheel slip during traction events, especially on high-friction surfaces, as they lack the skill to achieve and maintain desired slip levels, and transitioning between slipping and non-slipping conditions can be difficult, affecting vehicle acceleration and performance.
Innovation Solution
A method and system that allow drivers to control wheel slip by modifying the slip target based on pedal position, enabling greater control over wheel spin during high-friction conditions, allowing for direct control of slip levels and smooth transitions between slipping and non-slipping operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traction control is completely deactivated to allow wheel spin during acceleration on high-friction surfaces, then wheel slip can be generated for improved performance, but the driver cannot control the amount of slip and difficult to transition between slipping and non-slipping conditions
Solution Approach 1:
The system dynamically adjusts the traction control behavior based on detected road conditions. On high-friction surfaces, the system transitions from traditional slip-limiting behavior to a mode that allows controlled wheel spin during acceleration while maintaining driver control through the accelerator pedal. This dynamic adaptation resolves the contradiction by enabling performance-oriented slip when needed while preserving ease of operation through continuous driver control.
Solution Approach 2:
The system changes the control parameter from strictly limiting wheel slip to allowing controlled slip based on road friction detection. When high-friction conditions are detected, the system modifies the traction control algorithm to permit greater wheel spin during acceleration events, thereby improving vehicle launch performance while maintaining overall control through the existing pedal interface.
2Reliability
If traditional traction control limits wheel slip to increase traction, then vehicle stability is improved on low-friction surfaces, but acceleration performance is reduced on high-friction surfaces where higher slip may be beneficial
Solution Approach 1:
The system dynamically changes the slip control parameter based on detected road conditions. On low-friction surfaces, traditional slip limitation is maintained for stability. On high-friction surfaces, the system allows controlled slip during acceleration to improve performance. This parameter adaptation resolves the contradiction by making traction control effectiveness context-dependent rather than fixed.
Solution Approach 2:
The traction control system transitions from a static slip-limiting approach to a dynamic approach that adapts to road conditions. The system detects high-friction surfaces and temporarily modifies its behavior to permit wheel spin during acceleration, then returns to traditional control when conditions change. This dynamic behavior enables the system to maintain reliability across different conditions while optimizing acceleration performance when appropriate.
Data Source
AI summary
A method is provided for controlling a powertrain of a vehicle comprising wheels, and an accelerator pedal actuated by a driver. The method comprises controlling wheel slip to a first amount during a first road condition, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount during a second road condition, the second amount based on the driver requested output, the second road condition having higher friction than the first road condition.