Electronic Parking Brake Warning for Early Clamp Failure Detection

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Solution Overview

Problem

Conventional electronic parking brake systems fail to generate a clamping force due to mechanical damages, leading to safety accidents when the driver leaves the vehicle before failure detection is complete.

Innovation Solution

An electronic parking brake system with a controller that detects motor current, counts clamping force non-generation time, and warns the driver of a suspected failure using a warning unit when the time exceeds a preliminary failure detection time set shorter than the standard failure detection time, which is adjusted based on battery voltage and braking hydraulic pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the failure detection time is extended to ensure accurate failure determination, then the reliability of failure detection is improved, but the driver may leave the vehicle before detection completes, increasing safety risks

Engineering Contradiction:

Improvefailure detection reliabilityVSAvoidsafety accident risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary failure detection before the driver leaves the vehicle. A preliminary failure detection time shorter than the total failure detection time is set, and the warning unit activates during this preliminary period to warn the driver of suspected failures before they occur, preventing safety accidents while maintaining detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The warning unit provides real-time feedback to the driver during the preliminary failure detection period. When the controller detects suspected failure conditions, it immediately warns the driver through the warning unit, creating a feedback loop that allows the driver to take corrective action before leaving the vehicle.

Inventive Principle:

Principle #23Feedback

2Loss of time

If the preliminary failure detection time is set shorter than the failure detection time, then the driver is warned earlier of suspected failures, but the detection may not be complete, potentially causing false warnings

Engineering Contradiction:

Improvewarning time to driverVSAvoidfailure detection accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller performs partial failure detection during the preliminary failure detection time period. This partial detection is sufficient to identify suspected failures and trigger warnings, while the complete detection continues in the background to confirm the actual failure status.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12172617B2Electronic parking brake system and control method thereof

Publication Date: 2024.12.24 HL MANDO CORP

AI summary

Disclosed is an electronic parking brake system including an electronic parking brake provided to provide a clamping force necessary for parking a vehicle by a motor, a warning unit provided to warn a failure of the electronic parking brake, a current sensor provided to detect a current of the motor, and a controller electrically connected to the current sensor, wherein the controller determines whether a clamping force is generated depending on the motor current in a parking operation, counts a clamping force non-generation time when the clamping force is not generated, and warns a suspected failure of the electronic parking brake through the warning unit when the clamping force non-generation time elapses a preliminary failure detection time set shorter than a failure detection time of the electronic parking brake.