Electro-Mechanical Brake Control for Engine-Off Slope Braking
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Solution Overview
Problem
Existing electro-mechanical brake systems fail to accurately determine the braking intervention timing when the engine is turned off during vehicle travel, particularly on uphill or downhill slopes, leading to potential accidents due to loss of braking force.
Innovation Solution
An electro-mechanical brake device comprising a sensor unit, driving control unit, and actuator decision unit that assesses the driver's braking intention, hydraulic pressure generation, vehicle status, engine status, and transmission state to determine whether to engage the hydraulic braking unit or electronic parking brake, ensuring appropriate braking force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine is turned off during vehicle travel on a slope, then fuel consumption is reduced, but braking force is lost leading to potential accidents
Solution Approach 1:
The control unit determines braking necessity in advance by monitoring driver braking intention, hydraulic pressure changes, vehicle status, engine status, and transmission state before the engine is turned off, ensuring braking force is maintained when needed on slopes
Solution Approach 2:
The system continuously monitors multiple parameters including driver braking intention, master cylinder hydraulic pressure, vehicle status, engine status, and transmission state to dynamically determine whether braking intervention is required, providing real-time feedback control
2Speed
If the driver sets reverse gear on downhill or forward gear on uphill, then vehicle mobility is maintained, but braking control is lost due to engine shutdown
Solution Approach 1:
The control unit performs preliminary determination of braking necessity by analyzing gear position, vehicle speed, slope conditions, and other parameters before engine shutdown occurs, ensuring braking control is ready when needed
Solution Approach 2:
The control unit acts as an intermediary between the driver's gear selection and the braking system, monitoring transmission state and vehicle status to coordinate appropriate braking intervention when engine shutdown would otherwise cause loss of braking 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
The system effectively prevents accidents by accurately determining the need for braking intervention even when the engine is turned off, ensuring safe vehicle control on slopes by selecting the appropriate actuator for braking force generation based on real-time data.
Implementation Method 1
a hydraulic braking unit configured to supply a braking force to a wheel brake of the vehicle using hydraulic pressure generated from a master cylinder
Implementation Method 2
an electronic parking brake (EPB) configured to fix a wheel of the vehicle when the vehicle is parked
Data Source
AI summary
An electro-mechanical brake device comprising: a sensor unit comprising one or more sensors; an electronic parking brake (EPB) configured to fix a wheel of the vehicle when the vehicle is parked; a hydraulic braking unit configured to supply a braking force to a wheel brake using hydraulic pressure generated at a master cylinder; a driving control unit configured to determine whether braking is required for the vehicle based on at least one of a driver's braking intention, a change in the hydraulic pressure at the master cylinder, a vehicle status, an engine status and a transmission state, and further configured to determine whether an actuator has failed; and an actuator decision unit configured to, when the driving control unit determines that braking is required for the vehicle, brake the vehicle using any one of the hydraulic braking unit and the EPB depending on whether the actuator has failed.