electronic wedge brake - ewb - dmg-berlin.infodmg-berlin.info/page/downloads/vortrag_gombert.pdf ·...

Electronic Wedge Brake - EWB

Bernd Gombert

05-12-13 Strictly Confidental © Siemens VDO 2

Motivation

Product Description

Application Fields

Automotive Application

Benefits

eStop – Hermes Award 2004


Motivation

Product Description

Application Fields


Benefits

Motivation through Brake-by-Wire

Increasing Demand for More Comfort and SafetyCall for ever more sophisticated and complex braking and driver assistance systems.

Full Integration of Vehicle Systems: Complete Dynamic Safety System

Flexibility for AutomakersBrake by wire allows for branding by tailoring the overall "feel" of a vehicle through software changes rather than changing hardware on a vehicle.

Previous Attempts to Develop an Electrical Driven BrakeExtremely high actuator forces and energy requirement. Up to now an "all electric" brake by wire system could only be realized with a 42 V board architecture.

safer drivingenvironment

torque

ABS wheelspeed

suspensionlevel

yaw/pitch

steeringposition

stab

ility

syst

em

sensor data brakecontrol


Motivation

Product Description

Application Fields


Benefits

Chassis Control & Actuation Systems

InformationSystem

•Map Data•Communication

HMI –System

•Active Pedal•Active Steer

TotalVehicle

Controller

ActuationSystems

•Braking•Steering•Suspension

EngineControls

EnviromentRecognition

System•Radar•Camera•ADAS Sensors


Motivation

Product Description

Application Fields


Benefits

The Electronic Wedge Brake – EWB

The Electronic Wedge Brake (EWB) is a fully controlled electro-mechanical braking system with a high degree of mechanical self-reinforcement.By intelligently controlling the wedge, it becomes possible to convert the kinetic energy of the vehicle into actual braking force.The underlying physical effects lead to a significant reduction in the actuator’s energy demand.The EWB will be far superior to any brake by wire technologies presently being developed or already on the market in terms of energy consumption, efficiency, weight and price.

• Self Reinforcement – wedge principle• Dynamic Wedge Position Control• Brake Actuation Force – uses kinetic energy for stopping power• Scaleable Solution - small to ultra-large applications enjoy all

benefits of the EWB technology• Performance, Implementation and Cost Benefits


Motivation

Product Description

Application Fields


Benefits

Conventional Brake

Enforcementat the Brake Disc

Comparison of Basic Brake Principles

µα −=tan1*C

µ2* =CThe actuator has to actively generatethe full clamping

force.

controlledelectro-mechanicalwedge brake with

infinite self-reinforcement

eStop Technology

linear

non linear

Power GeneratingMethod of Braking

wedge power

normal power

Druck-bereich

Zugbereich

µ

*C

µ

old

new


Motivation

Product Description

Application Fields


Benefits

Applications for the EWB

cranes

trucks

elevator escalator

turning & millingmachines

tractors

rail vehicles

passenger cars

conveyors

cranes

trucks

elevator escalator

turning & millingmachines

tractors

rail vehicles

passenger cars

conveyors


Motivation

Product Description

Application Fields


Benefits



Motivation

Product Description

Application Fields


Benefits

Comparison of Components

Brake Pedal e-Pedal

Brake Caliper

EWB Caliper Backup-Battery

Main Brake Controller

Brake Booster

ESP

Vacuum Pump

Handbrake

Hydraulic Line

Hydraulic Brake System Electronic Wedge Brake


Motivation

Product Description

Application Fields


Benefits

Improved ABS performance especiallyon slippery roads and shorter stoppingdistance.

Continuous brake power distribution.

No brake fluid leads to longmaintenance intervals and environmental friendly brake system.

Independent mounting position (left-and right-steering).

Individual adaptive brake characteristic.

Approx. 15-22l additional volume in theengine compartment.

Brake-by-wire with 12 V boardarchitecture.

Benefits of the Electronic Wedge Brake


Motivation

Product Description

Application Fields


Benefits

additional volume in bogie/axle unit (design freedom)no bulky air compressor/ reservoirs

plug and play caliper, end of line test, simple assemblydiagnosable brakefaster development and adaptation by SW

Space & Weight

Modular System

&Service friendly

lower energy consumptionreduced life cycle costs

reduced service time in repair shopservice friendly (smaller/no compressor -> fluid change!)brake pad wear recognitionsimpler diagnostics and maintenance proceduresbrake pad change like conventional brake, standard spare partsbrake characteristic can be adjusted individually

Benefits for Manufacturer & Operatorof Rail Vehicles (1/3)

Rail Vehicle Manufacturer Rail Vehicle Operator


Motivation

Product Description

Application Fields


Benefits

Safety faster brake reactionenhanced, faster ABSwheel-specific braking brake power distribution (fading)brake pad position detection (substitute "Entlagenschalter")

increasing technology leader image and rail operator trustEnhanced reliability



Comfort enhanced traction control –slip&sticknoise reductionno grinding brake pads

increasing best of class image and end customer trust


Motivation

Product Description

Application Fields


Benefits

Cost Savings

Environment friendly

longer brake pad life time (avoid hot spots)improved efficiencyreduced maintenance cost (no change of compressor fluid)

increasing green image and rail operator trust

dry brake systemlower energy consumption (reduced life cycle costs)no compressor fluid disposal

no pneumatic architecture(step towards pure E-system)no compressor fluid fillingno expensive air compressor/reservoirs lower assembly times



electronic wedge brake - ewb - dmg-berlin.infodmg-berlin.info/page/downloads/vortrag_gombert.pdf ·...

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