Alternating EPB Control for Parking Durability

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Solution Overview

Problem

The durability of electric parking brake (EPB) systems is compromised due to increased operational frequency when they are activated not only during parking but also when the driver shifts to the P-stage in vehicles with electronic transmission systems.

Innovation Solution

Implementing a controller that determines and operates only one EPB at a time, based on the vehicle's gradient and driver's continuous driving intention, to minimize the number of operations and optimize clamping force, and switches operation between left and right EPBs as needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If both left and right EPBs are operated simultaneously when shifting to P-stage, then adequate clamping force is ensured, but the number of operations increases and durability deteriorates

Engineering Contradiction:

Improveclamping force adequacyVSAvoidEPB durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent divides the simultaneous operation of both EPBs into sequential alternating operations. The controller segments the braking function by operating the left EPB and right EPB alternately in different time periods, achieving the same parking effect while reducing the frequency of operations on each individual EPB unit.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic alternating operation between left and right EPBs. The controller periodically switches which EPB is active, creating a rhythmic pattern of operation that reduces cumulative wear on each unit while maintaining continuous adequate clamping force through the alternating sequence.

Inventive Principle:

Principle #19Periodic action

2Duration of action of stationary object

If only one EPB is operated alone when shifting to P-stage, then durability is improved by reducing operations, but clamping force adequacy must be maintained

Engineering Contradiction:

ImproveEPB durabilityVSAvoidclamping force adequacy

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The controller determines in advance which EPB should operate alone based on stored identification information from previous operations. This preliminary determination ensures that the selected EPB has not been recently operated, optimizing the distribution of wear and extending durability while maintaining adequate clamping force.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from stored identification information about previously operated EPBs to make intelligent decisions about which EPB should operate next. This feedback mechanism ensures balanced usage patterns that maintain both durability and clamping force adequacy over time.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20230049583A1Electronic parking brake system and control method therefor

Publication Date: 2023.02.16 HL MANDO CORP

AI summary

Disclosed herein an electric parking brake (EPB) system includes a first EPB provided on a left wheel of a vehicle; a second EPB provided on a right wheel of the vehicle; and a controller configured to determine an EPB that is to be operated alone from among the first and second EPBs in response to a gear being shifted to a P-stage, and operate the determined EPB alone.