Braking Pressure Threshold Limiting for Split Road Surface Stability
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Solution Overview
Problem
Existing brake traction control systems face challenges in maintaining optimal braking pressure on split road surfaces, leading to instability in high-friction wheels and degradation of climbing performance when driving uphill, as excessive braking pressure applied to low-friction wheels causes high-friction wheels to slip.
Innovation Solution
A method that determines slip in driving wheels, calculates cumulative braking pressure applied to low-friction wheels during BTCS control, compares it with a pre-set threshold, and sets a new braking pressure threshold to prevent excessive pressure application, thereby stabilizing high-friction wheels and improving climbing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking pressure is applied to a low-frictional driving wheel to prevent slip, then traction control is improved, but the high-frictional driving wheel becomes unstable and slips
Solution Approach 1:
The controller monitors the rotational speeds of both driving wheels and detects when the high-frictional wheel becomes unstable. When instability is detected, the controller adjusts the braking pressure on the low-frictional wheel by limiting the increase rate of braking pressure, creating a feedback loop that prevents the instability problem while maintaining traction control effectiveness.
Solution Approach 2:
The system dynamically adjusts the braking pressure characteristics based on real-time wheel speed measurements. By changing the pressure application rate from aggressive to controlled when instability is detected, the system adapts its behavior to prevent the high-frictional wheel from slipping while still providing necessary traction control on the low-frictional wheel.
2Reliability
If consistent pressure is applied to adjust spin amount to target value, then spin control is improved, but climbing performance deteriorates due to continuous instability
Solution Approach 1:
Instead of applying continuous consistent pressure, the system uses periodic monitoring of wheel speeds and applies braking pressure in controlled intervals. The pressure application is paused or limited when instability is detected, creating a periodic control pattern that allows the high-frictional wheel to regain stability while still achieving spin control objectives over time.
Solution Approach 2:
The braking pressure application rate is dynamically changed from consistent to variable based on stability conditions. When the high-frictional wheel shows signs of instability, the system reduces or limits the pressure increase rate, allowing the vehicle to maintain climbing performance while still achieving the target spin control through adjusted pressure application timing and magnitude.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively limits braking pressure on low-friction wheels, preventing instability in high-friction wheels and enhancing vehicle climbing performance on split road surfaces by setting a controlled braking pressure threshold based on cumulative calculations.
Implementation Method 1
The brake uses a hydraulic force, which is applied depending on a driver's brake pedal operating force
Implementation Method 2
a Traction Control System configured to control a driving force of an engine so as to prevent an excessive slip at a time of sudden unintended acceleration or sudden acceleration
Implementation Method 3
the BTCS performs a control to prevent a slip phenomenon between wheels and a road surface when the vehicle starts
Data Source
AI summary
Disclosed is a braking pressure threshold setting method of a brake traction control system. The method includes steps of: determining whether a slip occurs in a driving wheel; initiating a BTCS control when the slip occurs in the driving wheel; determining whether instability occurs in a high-frictional driving wheel; cumulatively calculating a braking pressure applied to the low-frictional driving wheel; comparing the cumulatively calculated braking pressure value and a pre-set braking pressure threshold of the low-frictional driving wheel; and, when the cumulatively calculated braking pressure value exceeds the pre-set braking pressure threshold of the low-frictional driving wheel, setting the braking pressure applied to the low-frictional driving wheel when the slip occurs in the high-frictional driving wheel, as the threshold. Thus, it is possible to prevent the braking pressure exceeding the pre-set threshold from being applied to the low-frictional driving wheel when climbing a slope road formed with a split road surface such that a climbing performance can be improved.