Vehicle Traction Control for Road Bump Slip Detection
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Solution Overview
Problem
The traction control system (TCS) of a vehicle often operates unnecessarily when passing a road bump, leading to decreased acceleration and starting performance due to increased slip ratios and wheel speeds, which are not indicative of a slippery surface.
Innovation Solution
A method and device that determine whether the vehicle's wheels are passing a bump by analyzing the acceleration patterns of the front and rear wheels within specific time periods, allowing for controlled power source management to prevent unnecessary TCS activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traction control system operates based on wheel slip detection, then wheel slip is reduced and acceleration performance is improved, but the system operates unnecessarily on bumps causing deterioration of acceleration performance
Solution Approach 1:
The patent segments the wheel acceleration signal analysis into multiple stages: initial acceleration detection, fluctuation range calculation, and bump determination. By dividing the acceleration signal into time periods and calculating fluctuation ranges separately for each period, the system can accurately distinguish between bump-induced acceleration and slip-induced acceleration, preventing unnecessary TCS activation on bumps while maintaining effectiveness on slippery surfaces
Solution Approach 2:
The patent implements dynamic threshold adjustment by calculating the fluctuation range of wheel acceleration relative to the initial acceleration value. Instead of using a fixed threshold, the system adapts the threshold based on the actual acceleration characteristics detected, allowing it to differentiate between bump impacts (which cause temporary fluctuations) and genuine slip conditions (which sustain elevated acceleration), thereby resolving the contradiction between TCS reliability and acceleration performance
2Reliability
If the traction control system reduces torque or brake pressure to control wheel speed, then wheel slip is prevented, but acceleration and starting performance deteriorate when passing bumps
Solution Approach 1:
The patent performs preliminary analysis of wheel acceleration characteristics before activating the traction control system. By detecting the initial acceleration value and calculating the fluctuation range in advance, the system can predict whether an upcoming condition is a bump or a slippery surface. This preliminary action prevents premature TCS activation on bumps, preserving acceleration power while maintaining wheel slip control when actually needed
Data Source
AI summary
A method and apparatus for controlling a vehicle are disclosed. The method comprises acquiring an acceleration of a front wheel and a rear wheel, determining that the front wheel is passing a bump of a road in response to determining that the acceleration of the front wheel is outside an acceleration range and fluctuates in the range wider than the acceleration range within a first maximum time period, determining that the rear wheel is passing the bump in response to determining that the acceleration of the rear wheel is outside the acceleration range and fluctuates in the range wider than the acceleration range within a second maximum time period, and in response to determining that the front wheel has passed the bump and the rear wheel is passing the bump, controlling a drive unit of the vehicle.