Traction Control Torque Adjustment for Low-Friction Transitions
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Solution Overview
Problem
Vehicles experience instability and excessive spin when transitioning from a high-friction road surface to a low-friction surface due to inappropriate torque control by traction control systems, leading to reduced acceleration and potential damage.
Innovation Solution
A traction control system that adjusts engine torque using a proportional-integral (PI) control method, decreasing torque when transitioning to a low-friction surface and increasing it over a predetermined threshold time based on vehicle acceleration, to minimize wheel spin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the target torque value is increased to improve acceleration on high-friction road surfaces, then acceleration capability is improved, but wheel spin occurs when transitioning to low-friction road surfaces
Solution Approach 1:
The torque control system dynamically adjusts the target torque value based on real-time road friction detection. When a transition from high-friction to low-friction road surface is detected, the system automatically reduces the target torque value to prevent wheel spin, and restores it after a predetermined threshold time. This dynamic adjustment resolves the contradiction by making the torque delivery adaptive to changing road conditions rather than fixed.
Solution Approach 2:
The system uses vehicle acceleration feedback to detect road friction changes. When acceleration decreases unexpectedly (indicating transition to low-friction surface), the system triggers torque reduction. This feedback mechanism allows the system to respond to actual road conditions, resolving the contradiction between maintaining high acceleration and preventing wheel spin on varying surfaces.
2Stability of the object's composition
If the target torque value is decreased to prevent wheel spin on low-friction road surfaces, then wheel spin is reduced, but acceleration capability is compromised
Solution Approach 1:
The system dynamically adjusts torque based on detected road conditions. When low-friction surface is detected, torque is temporarily reduced to prevent wheel spin. After a predetermined threshold time without further spin events, the system restores the target torque value to maintain acceleration capability. This dynamic approach resolves the contradiction by applying torque reduction only when and where needed.
Solution Approach 2:
The system implements periodic torque adjustment through a threshold time mechanism. When wheel spin is detected on low-friction surfaces, torque is reduced for a predetermined threshold period, then restored. This periodic action pattern allows the system to temporarily compromise acceleration to prevent wheel spin, then resume normal acceleration capability when conditions stabilize.
3Productivity
If high torque is delivered to wheels on high-friction road surfaces to maximize acceleration, then acceleration is improved, but excessive wheel spin occurs when transitioning to low-friction surfaces
Solution Approach 1:
The system applies preliminary anti-action by detecting the transition to low-friction road surfaces before excessive wheel spin occurs. When acceleration suddenly decreases (indicating friction drop), the system proactively reduces target torque value before significant wheel spin can develop. This preventive approach resolves the contradiction by counteracting the harmful effect before it fully manifests.
Solution Approach 2:
The system rapidly transitions torque from high to low values when road friction change is detected, skipping the intermediate state that would cause wheel spin. The predetermined threshold time mechanism allows the system to quickly pass through the critical transition period on low-friction surfaces, minimizing the duration of potential wheel spin while maintaining acceleration performance when appropriate.
Data Source
AI summary
Disclosed herein are a traction control system and a control method thereof. The traction control system includes a communicator configured to receive acceleration of a vehicle; and a controller configured to decrease output torque in response to a decrease of the received vehicle acceleration, wherein the controller outputs second torque smaller than first torque corresponding to the decreased vehicle acceleration and then increases the second torque to the first torque during a predetermined first threshold time when the controller determines that the vehicle is traveling on a low-friction road surface into which a high-friction road surface changed on the basis of the vehicle acceleration.