Electronic Parking Brake Control for Wheel Slip Emergency Braking
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Solution Overview
Problem
Existing emergency braking systems using electronic parking brakes (EPB) fail to effectively stabilize vehicle stability and braking response on various road surfaces, particularly when the main braking system fails, as they only react after wheel lockup occurs.
Innovation Solution
An emergency braking system that utilizes an EPB to continuously determine road surface conditions and adjust braking force based on slip ratio, incorporating an EPB actuator, slip detection, and control unit to manage braking force dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB dynamic braking function acts similar to ABS when wheel lockup occurs, then the braking function is activated, but the vehicle becomes less stable and less responsive to braking
Solution Approach 1:
The system performs preliminary detection of wheel slip conditions before complete lockup occurs. The slip detection unit continuously monitors wheel speed and detects slip conditions early, allowing the control unit to activate EPB braking in advance rather than waiting for full lockup, thereby maintaining vehicle stability while ensuring braking function activation.
Solution Approach 2:
The system implements continuous feedback through the slip detection unit that monitors wheel speed and slip conditions. This feedback loop allows the control unit to adjust EPB actuator operation in real-time based on actual wheel slip status, preventing excessive braking that would cause instability while ensuring adequate braking force is applied.
2Speed
If the EPB actuator applies emergency braking force to the wheel, then braking deceleration is achieved, but wheel slip occurs on low-friction road surfaces
Solution Approach 1:
The system dynamically adjusts the braking force applied by the EPB actuator based on real-time road surface conditions detected through wheel slip monitoring. The control unit modifies the braking force magnitude and application rate according to the detected slip ratio, enabling effective braking deceleration on varying road surfaces while preventing excessive slip that would compromise vehicle stability.
3Loss of time
If the braking force is increased rapidly to achieve emergency stopping, then stopping distance is reduced, but wheel lockup occurs reducing control
Solution Approach 1:
The control unit uses continuous feedback from the slip detection unit to monitor wheel slip conditions during emergency braking. Based on this feedback, the control unit dynamically adjusts the EPB actuator force to achieve rapid deceleration while preventing wheel lockup, thereby maintaining steering control and ease of operation during the emergency stopping process.
Solution Approach 2:
The system changes the braking force parameters dynamically during the emergency braking process. The control unit adjusts the magnitude and rate of force application based on detected wheel slip conditions, allowing rapid initial deceleration while preventing lockup by reducing force when slip thresholds are approached, thus maintaining control.
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
Enhances vehicle stability and braking response by rapidly adjusting braking force according to road conditions, improving emergency braking control on both high and low-friction surfaces.
Implementation Method 1
an EPB control unit configured to determine a road surface condition by calculating a slip ratio through slip information transmitted from the slip detection unit
Implementation Method 2
an EPB actuator configured to apply an emergency braking force to a wheel
Data Source
AI summary
Disclosed herein is an emergency braking system using an electronic parking brake according to the present disclosure, in which the emergency braking system is configured to provide an emergency braking using an electronic parking brake (EPB) in case of total or partial failure of a main braking system, and includes: an EPB actuator configured to apply an emergency braking force to a wheel; a slip detection unit configured to detect a wheel slip on the wheel equipped with the EPB actuator; an EPB control unit configured to determine a road surface condition by calculating a slip ratio through slip information transmitted from the slip detection unit, and to control an operation of the EPB actuator based on the road surface condition.