Vehicle Traction Control Variable Start and Fixed Termination Conditions
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Solution Overview
Problem
Conventional traction control systems in vehicles struggle to accurately determine when to initiate and terminate traction control, especially on varying road surfaces, leading to delayed or premature termination of traction control, which can result in unstable vehicle performance.
Innovation Solution
A traction control system that includes a detector for monitoring wheel slip, a condition determiner to set variable control start and termination conditions based on a slip determination factor that changes with vehicle state, and a controller to execute traction control, ensuring the control start condition is sensitive to changes in vehicle state while the termination condition is less responsive, allowing adaptive initiation and termination of traction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control start condition and control termination condition are set to the same threshold value, then the traction control can be simply controlled, but the traction control cannot be properly terminated when the vehicle exits a bad road surface condition
Solution Approach 1:
The patent applies dynamics by making the control start condition variable based on vehicle state (speed, acceleration, throttle opening) while keeping the control termination condition fixed. This allows the system to adapt to changing driving conditions during traction control execution, enabling proper termination when the vehicle exits bad road surface conditions while maintaining simple control logic.
Solution Approach 2:
The patent changes the parameter of the control start condition from a fixed threshold to a variable threshold that depends on vehicle state parameters (vehicle speed, acceleration, throttle opening degree). This parameter change allows the system to distinguish between temporary slip conditions and sustained bad road surface conditions, improving termination accuracy without increasing system complexity.
2Speed
If the control start condition is set to be sensitive to vehicle state changes, then the traction control can be timely initiated, but the traction control may be prematurely terminated when the monitored value fluctuates
Solution Approach 1:
The patent segments the control conditions into two distinct parts: a variable control start condition that is sensitive to vehicle state changes for timely initiation, and a fixed control termination condition that provides stability to prevent premature termination. This segmentation allows each condition to fulfill its specific function without interfering with the other.
Solution Approach 2:
The patent applies inversion by making the control start condition variable (sensitive) while making the control termination condition fixed (insensitive). This reverse approach to what might be intuitively expected (making both conditions similar) allows the system to achieve both timely initiation and stable execution by having the termination condition be less responsive to fluctuations.
3Productivity
If the traction control is terminated when the monitored value decreases, then the control can respond to improved road conditions, but the traction control cannot be properly maintained when the vehicle is still on a bad road surface
Solution Approach 1:
The patent uses feedback by continuously monitoring vehicle state parameters (speed, acceleration, throttle opening) to adjust the control start condition threshold. This feedback mechanism allows the system to maintain appropriate traction control levels based on current driving conditions while preventing premature termination on bad road surfaces, as the variable threshold adapts to the overall vehicle state rather than reacting to temporary monitored value fluctuations.
Data Source
AI summary
A traction control system in vehicle comprises a detector for detecting a monitored value which changes according to a degree of a drive wheel slip; a condition determiner for determining whether or not the monitored value meets a control start condition and whether or not the monitored value meets a control termination condition; and a controller for executing traction control to reduce a driving power of the drive wheel during a period of time from when the condition determiner determines that the monitored value meets the control start condition until the condition determiner determines that the monitored value meets the control termination condition; the condition determiner being configured to set at least the control start condition variably based on a slip determination factor which changes according to a vehicle state and such that the control start condition changes more greatly according to the vehicle state than the control termination condition.