69283323 Sensotronic Brake System Rahul

8/12/2019 69283323 Sensotronic Brake System Rahul

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SENSOTRONIC BRAKE SYSTEM


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SENSOTRONIC BRAKE SYSTEM


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Sensotronic Brake System 2011

CONTENTS

S. TOPIC PAGE NUMBER

NO

1 Introduction 2 to 4

2 Contribution of mec!tronic" # to $

% Com&onent" of SBC $ to '

4 C!r!cteri"tic" !nd fe!ture" of SBC ( to 1$

# )i"!d*!nt!+e" of SBC 1$ to 1,

$ C!r" -it SBC 1'

, Bibio+r!&/ 1(

Department of mechanical and manufacturing Page 2


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CONTRIBUTION OF MECHATRONICS

Mechatronics - a new term is gaining popularity within the automotive industry

and is rapidly developing into the catchword of a quiet technological revolution

which in many fields stands century-old principles on their head. Mechatronics

brings together two disciplines which in many cases were thought to be

irreconcilable, namely mechanics and electronics.

Hence automobile functions which hitherto worked purely mechanically and partly

with hydraulic assistance will in future be controlled by high-performance

microcomputers and electronically controllable actuators. hese either replace the

conventional mechanical components or else enhance their function. he

mechatronic interplay therefore opens up hitherto inconceivable possibilities to

further raise the safety and comfort levels of modern passenger cars. !or

e"ample# it was only thanks to mechatronics that an electronically controlled

suspension system which instantly adapts to prevailing conditions when driving

off, braking or cornering -- thus providing a totally new driving e"perience --

became a reality. $n %&&& Mercedes-'en( launched this system under the name

)ctive 'ody *ontrol +)'* in the flagship * coup, thereby signalling the advent

of a new era of suspension technology.

his electronically controlled suspension system has quickly been followed by the

electronic brake system# Mercedes-'en( and 'osch have teamed up on this

benchmark development pro/ect which will shortly enter into series production at

the 0tuttgart automobile brand under the name 0ensotronic 'rake *ontrol -- or

0'* for short.



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$t turns the conventional hydraulic brake into an even more powerful mechatronic

system. $ts microcomputer is integrated into the cars data network and processes

information from various electronic control units. $n this way, electric impulses and

sensor signals can be instantly converted into braking commands, providing a

marked safety and comfort gain for drivers.

1Mercedes benz

*3MP34540 3! 0'*

0'rake 3perating 6nit +'36

07heel speed sensors

0raction 0ystem Hydraulic unit



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BRAKE OPERATING UNIT (BUO

he 'rake 3perating 6nit +'36 consists of the following#

'rake fluid reservior

0'* pedal value sensor

andem master cylinder

'rake pressure simulator

2BUO

PE!A" #A"UE SENSOR

0$t contains two hall effect sensors.

0*onverts pedal travel distance into electrical

signal



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TRACTION SYSTEM HY!RAU"IC UNIT

$t contains 0'* control

module , pressure

reservoir and high

pressure charge pump.

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CHARACTERISTIC FEATURES AN! A!#ANTAGES OF SBC

0E$ec%r&n'c br)e *ed$#

o turn to the technical side# when drivers hit the brake pedal today, their foot

moves a piston rod which is linked to the brake booster and the master brake

cylinder. ;epending on the pedal force, the master brake cylinder builds up the

appropriate amount of pressure in the brake lines which - in a tried and tested

interaction of mechanics and hydraulics - then presses the brake pads against the

brake discs via the wheel cylinder.

$n the Mercedes-'en( 0ensotronic 'rake *ontrol, by contrast, a large number of

mechanical components are simply replaced by electronics. he brake booster will

not be needed in future either. $nstead sensors gauge the pressure inside the

master brake cylinder as well as the speed with which the brake pedal is operated,

and pass these data to the 0'* computer in the form of electric impulses.

o provide the driver with the familiar brake feel engineers have developed a

special simulator which is linked to the tandem master cylinder and which moves

the pedal using spring force and hydraulics. $n other words# during braking the

actuation unit is completely disconnected from the rest of the system and serves

the sole purpose of recording any given brake command. 3nly in the event of a

ma/or fault or power failure inside the %2< vehicle battery does 0'* automatically

use the services of the tandem master cylinder and instantly establishes a direct

hydraulic link between the brake pedal and the front wheel brakes in order to

decelerate the car safely.

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0F+$$ br)e *&/er '$b$e een /.en %.e en'ne 's s/'%c.ed &--

he hydraulic unit mainly comprises four so-called wheel pressure modulators.

hey mete out the brake pressure as required and pass it onto the brakes. $n

this way it is possible to meet the microcomputers stipulations while each wheel

is slowed down separately in the interests of driving stability and optimum

deceleration. hese processes are monitored by pressure sensors inside the

wheel pressure modulators.

0E,erenenc3 br)'n s%&*'n d'%nce red+ced b3 %.ree *ercen%

he main performance characteristics of 0ensotronic 'rake *ontrol include the

e"tremely high dynamics during pressure build-up and the e"act monitoring of

driver and vehicle behaviour using sophisticated sensors. Mercedes-'en( is

thus moving into new dimensions of driving safety.

ake the e"ample of the emergency brake# 0'* already recognises the drivers

rapid movement from the accelerator onto the brake pedal as a clue to an

imminent emergency stop and responds automatically# with the aid of the high-

pressure reservoir, the system increases the pressure inside the brake lines and

instantly presses the pads onto the brake discs so that they can get a tight grip

the moment the driver steps onto the brake pedal.

)s a result of this so-called prefilling of the brake system, the stopping distance

of an 0'*-equipped sports car from a speed of %2? km@h is cut by around three

per cent compared to a car featuring conventional braking technology.

hanks to electrohydraulic back-up, the performance of 'rake )ssist is also

improved further. $f this system issues the command for an automatic emergency

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stop, the quick pressure build-up and the automatic prefilling of the wheel brakes

leads to a shorter braking distance.

0!r''n s%b'$'%3 *rec'se br)'n ',*+$ses -&r *er-ec% ESP *er-&r,nce

$t is not /ust in emergency braking that 0ensotronic 'rake *ontrol proves its

worth, but also in other critical situations - for e"ample, when there is a risk of

swerving. 6nder such conditions, the system interacts with the 5lectronic

0tability Program +50P= which keeps the vehicle safely on course through

precise braking impulses at all wheels and@or by reducing engine speed.

0'* once again offers the benefits of greater dynamics and precision# thanks to

the even faster and more accurate braking impulses from the 0'* high-pressure

reservoir, 50P= is able to stabilise early and comfortably a vehicle which is

about to break away.

his is evident, for e"ample, from the results of the


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0Br)'n % c&rners re%er s-e%3 %.n)s %& r'b$e br)e *ress+re

5ven when braking in corners, 0'* also offers more safety than a conventional

brake system. his is where the variable and targeted brake force distribution is

of particular advantage to actively influence the cars compliance steer.

7hile conventional brake systems always mete out the brake pressure equally to

the inner and outer wheels, 0'* offers the possibility of assigning brake forces

in a way appropriate to the situation. Hence the system will automatically

increase the brake pressure at the outer wheels because the higher vertical

forces also allow them to transfer greater brake forces. )t the same time the

brake forces at the inner wheels are reduced to provide the higher cornering

forces needed to stay on course. he result is a more stable braking behaviour

along with optimum deceleration values.

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7ith the innovative 0ensotronic 'rake *ontrol Mercedes engineers still stick to

the proven principle of a variable brake force control for the front and rear a"les.

hey program the system in such a way that, when slowing down from a high

speed, the larger part of the brake force continues to act on the front a"le. his

prevents a potentially ha(ardous overbraking of the rear a"le. )gain 0'* is

capable of adapting to the prevailing situation. )t low speeds or during partial

braking, the system automatically increases the brake force share at the rear

a"le to improve brake system response and achieve even wear and tear of the

brake pads.

0C&,-&r% n& *ed$ 'br%'&n d+r'n d+r'n ABS &*er%'&n

'oth the separation of the 0'* pedal from the rest of the brake system and the

proportional pressure control using mechatronics serve to increase brake

comfort - particularly during sharp deceleration or when the anti-lock braking

system is operational.

he usual vibration of the brake pedal when )'0 sets in does not occur, which,

Mercedes engineers have found, is not only a comfort feature of the new

system but also offers measurable safety benefits. heir research in

;aimler*hryslers 'erlin driving simulator has revealed that almost two thirds of

all drivers are startled when )'0 pulsation sets in# they do not increase the

brake force further and are even prone to taking their foot off the brake pedal for

a short while, thereby lengthening the stopping distance of their vehicle - in the

driving simulator by an average of 2.%? metres during )'0 braking from 8?

km@h on a snow-covered road surface.

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3n hills or steep drives the 0ensotronic 'rake *ontrol!r'e4A/3 Ass's%

prevents the car from rolling backwards or forwards - stepping onto the brake

pedal quickly but sharply is all it takes to activate the brake. $f the driver

accelerates, the ;rive-)way )ssist releases the brake and allows the car to

drive off smoothly.

T.e -+%+re SBC *'n %.e /3 -&r +%&,%'c +'dnce s3s%e,s

he advent of electronics in brake technology opens up new and promising

opportunities to Mercedes engineers - and not only in the disciplines of safety

and comfort. hanks to 0'* they have also moved a considerable way closer to

the realisation of their long-term ob/ective, namely to be able to automatically

guide the cars of the future along the roads with the aid of video cameras,

pro"imity radar and advanced telematics.

MA5OR !ISA!#ANTAGE OF SBC

S&-%/re -'$+re

he technology eliminates the mechanical link between the drivers brake pedal

and the brakes, substituting an electrical link that actuates the brake calipers.

*ustomer complaints were linked to the failure of software for the brake system.

7hen the system failed, the hydraulic system took over. 'ut that resulted in a

longer stopping distance and additional brake pedal effort by the driver.

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CARS 6ITH SBC

0Mercedes 0 roadster +E2A?

0Mercedes 5-*lass sedan +72%% and 5state +02%% until mid 2??8

0Mercedes 5-*lass >matic sedan +72%% and >matic 5state +02%% until mid

2??8

0Mercedes 0E +*%&&

0Maybach 19 and 82 +72>?

0Mercedes *0 coupe +*2%& until mid 2??8

69283323 Sensotronic Brake System Rahul

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