Vehicle Wheel Slip Control via Suspension Displacement
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Solution Overview
Problem
Conventional Traction Control Systems (TCS) fail to account for suspension displacement when controlling wheel braking, leading to driving force loss on bumpy road surfaces and inability to escape uneven terrain.
Innovation Solution
A device and method that utilize displacement sensors to measure suspension displacement and a controller to adjust braking based on slip ratio, expected slip ratio, tuning value, and adjustment factor, activating braking mode when the slip ratio exceeds a calculated threshold and maintaining it under specific conditions to prevent driving force loss and facilitate escape from bumpy surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional TCS controls wheel braking without considering suspension displacement, then the control system is simple, but driving force is lost on bumpy road surfaces
Solution Approach 1:
The control system is segmented into multiple independent components: displacement sensors for each wheel, individual slip ratio calculations per wheel, and separate braking control for each wheel. This allows the system to process suspension displacement information without requiring a complete system redesign, thereby maintaining relative simplicity while improving driving force control on bumpy surfaces
Solution Approach 2:
The system performs preliminary calculation of slip ratio by combining wheel speed information with suspension displacement data before activating braking control. By pre-processing the displacement information and calculating expected slip ratios in advance, the system prepares control parameters that prevent driving force loss without requiring complex real-time decision-making during slip events
2Reliability
If TCS activates braking based on slip ratio threshold, then wheel slip is controlled, but braking is activated inappropriately on bumpy roads where wheels may float
Solution Approach 1:
The system continuously monitors suspension displacement through sensors and feeds this information back to the control unit. The displacement data is used to dynamically adjust the slip ratio threshold and determine whether observed slip is due to actual loss of traction or suspension movement. This feedback mechanism distinguishes between genuine slip conditions requiring braking and apparent slip caused by wheel floating, thereby preventing false braking activation while maintaining reliable slip control
Solution Approach 2:
The slip ratio threshold and braking control parameters are made dynamic rather than fixed. The system adjusts the effective slip threshold based on real-time suspension displacement measurements, allowing the control behavior to adapt to varying road conditions. When displacement indicates wheel floating, the system raises the effective threshold to prevent inappropriate braking; when displacement indicates normal contact, the system uses standard thresholds for effective slip control
Data Source
AI summary
A device for controlling wheel slip of a vehicle includes: a displacement sensor for measuring a suspension displacement of drive wheels; and a controller configured to control braking of the drive wheels in consideration of the suspension displacement of the drive wheels when slip occurs on the drive wheels. The device may control braking of a slip-occurred wheel in consideration of a displacement of a suspension corresponding to the slip-occurred wheel of the vehicle.