Electronic Parking Brake Rolling Detection Using Vertical Acceleration

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Solution Overview

Problem

Existing electronic parking brake (EPB) systems often incorrectly detect vehicle movements, leading to unnecessary operations and increased load on the system, as they fail to distinguish between vehicle rolling and shaking, which can result in false re-clamping of the parking brake.

Innovation Solution

Incorporating a vertical acceleration sensor and a wheel speed sensor, with an electronic control unit (ECU) that determines whether the vehicle is rolling or shaking by counting instances of vertical acceleration exceeding a reference value, and disabling rolling detection when shaking is determined to prevent false re-clamping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the EPB system automatically re-clamps the parking brake when vehicle movement is detected, then the reliability of parking brake function is improved, but false detection of vehicle shaking as rolling causes unnecessary operations and increased system load

Engineering Contradiction:

Improveparking brake functionVSAvoidsystem load

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the detection parameter from simple wheel speed to a combination of wheel speed and vertical acceleration. By monitoring vertical acceleration characteristics (frequency, amplitude, duration), the system can distinguish between rolling movements and shaking vibrations, thereby reducing false re-clamping operations and decreasing unnecessary system load while maintaining parking brake reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional mechanical rolling detection mechanism with an electronic sensing system that uses vertical acceleration sensors and ECU-based algorithms. This substitution enables more precise differentiation between rolling and shaking through signal processing, reducing false detections and unnecessary brake operations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If the EPB system uses wheel speed sensor alone to detect rolling, then the device complexity is low, but the measurement precision is insufficient to distinguish between shaking and rolling

Engineering Contradiction:

Improvedetection systemVSAvoidvehicle movement detection

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent merges the functions of the wheel speed sensor and vertical acceleration sensor into a unified detection system managed by the ECU. By combining data from both sensors and analyzing their combined output, the system achieves high measurement precision in distinguishing rolling from shaking while maintaining reasonable device complexity through integrated control logic

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the EPB system performs frequent re-clamping operations to ensure parking safety, then the reliability is improved, but the durability of the brake system decreases due to excessive wear

Engineering Contradiction:

Improveparking safetyVSAvoidbrake system durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the detection parameters to include vertical acceleration characteristics that enable differentiation between genuine rolling events and shaking vibrations. By accurately identifying only true rolling events, the system performs re-clamping operations only when necessary, thereby maintaining parking safety while reducing excessive wear and extending brake system durability

Inventive Principle:

Principle #35Parameter changes

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

Effectively prevents false detection of vehicle movements, reducing unnecessary operations and system load by accurately distinguishing between vehicle rolling and shaking modes, thereby optimizing the functioning of the EPB system.

Implementation Method 1

a vertical acceleration sensor which measures a vertical acceleration value

Methodology Applied

Scientific EffectAcceleration sensing: Accelerometer

Implementation Method 2

a wheel speed sensor which senses a movement of a vehicle

Methodology Applied

Scientific EffectSpeed sensing:

Implementation Method 3

an actuator having a motor which generates braking power

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Data Source

PatentUS10017166B2Electronic parking brake system in vehicle and control method thereof

Publication Date: 2018.07.10 HL MANDO CORP

AI summary

Disclosed herein are an electronic parking brake system and a method of controlling the same. The electronic parking brake system includes a wheel speed sensor which senses a movement of a vehicle; a vertical acceleration sensor which measures a vertical acceleration value; an electronic control unit (ECU) which determines whether the vehicle is rolling based on the movement of the vehicle and the vertical acceleration value; and a parking brake which brakes the vehicle based on the determination of whether the vehicle is rolling by the ECU.