奥迪A3整车-刹车系统

2024年2月5日发(作者：沃尔沃s60报价及图片2022)

Brake systemOverviewThe brake system of the Audi A3 ’13 is a logical progression from

the brake system of its predecessor. At the start of production, 15

and 16 inch systems will be used on the front axle and a 15 inch

system on the rear axle. The brake systems perform better than

those of the predecessor model at comparable engine power

output. Pistons with larger diameters are used on all models,creating sportier pedal feel. The electro-mechanical parking brake

(EPB) is used for the first time in this class of vehicle. The brake

servo and pedal assembly are new developments. The Audi A3 ’13

is the first Audi to be equipped with Continental\'s ESP MK100

brake MK 100 by Continental

(see page 15)612_02615 or 17 inch wheel brakes

depending on engine versionTandem master brake cylinder

with single 10“ or 11“ brake servo

for left-hand drive models7“/8“ or 8“/8“ tandem brake

servo for right hand drive models15\" rear wheel brakes with electro-mechanical parking brake (EPB)9

Front wheel brakesEngine typeMinimum wheel sizeBrake typeNumber of pistonsPiston diameterBrake disc diameter10R4 1.2 TFSI 77 kWR4 1.8 TFSI 132 kWR4 2.0 TFSI 206 kWR4 1.4 TFSI 90 kWR4 2.0 TDI 135 kWR4 1.6 TDI 77 kWR4 2.0 TDI 110 kW15“16“17“PC57-25/14 15“PC57-25/14 16“C60-30/13 17“TRWTRWTRW11157 mm57 mm60 mm288 mm312 mm340 mm612_027

Rear wheel brakesEngine typeR4 1.2 TFSI 77 kWR4 1.4 TFSI 90 kWR4 1.8 TFSI 132 kWR4 1.6 TDI 77 kWR4 2.0 TDI 110 kWR4 2.0 TDI 135 kW15“FNc-M38-1510 TMD

Continental138 mm272 mmR4 2.0 TFSI 206 kWMinimum wheel sizeBrake typeNumber of pistonsPiston diameterBrake disc diameter17“FNc-M42-1722 TMD

Continental142 mm310 mm612_02811

Brake servo, master brake cylinder, pedal assembly10’’ or 11’’ single brake servos are used on left-hand drive models

of the Audi A3. Their size is dependent on intake manifold pres-sure, and hence on engine type. For space reasons, a 7’’/8’’ tandem

brake servo is used on right-hand drive models. Models with the

top of the range 2.0 TFSI 206 kW engine, to be introduced at a

later date, will receive an 8’’/8’’ brake servo. The brake servo is a

new development. The brake servo is lighter than its predecessor.

This weight reduction was achieved by using high tensile steel for

the outer shells and revised pressure build-up is based on a single rate pedal assembly is a new development. The pedals are arranged

in suspension. A common plastic bearing pedestal is used for the

accelerator and brake pedals in order to reduce c bearing pedestalElectro-mechanical parking brake (EPB)For the first time in this class of vehicle, the electro-mechanical

parking brake (EPB) well known from other models is used in the

Audi A3 ’13. The system is supplied by Continental. This made it

possible to integrate the control software into the ABS control unit

J104, which likewise is sourced from Continental.

12612_029612_030612_031

Design and functionParking brake motors V282 and V283 are new developments with

a modified design compared to the TRW components used previ-ously in Audi models. Gear reduction is provided by a two-step

worm drive. The required self-locking effect is produced in the

second gear step. The brake caliper spindle is inserted into the spur

gear of the second gear step when assembling the parking brake

motor. The spindle and spur gear are connected by internal and

external torx profiles. The spindle is a component part of the ball

screw and is mounted in the brake caliper. It applies pressure to

the inner face of the brake piston via the spindle spur gear driven by the electric motor transmits the rotational

movement to the spindle. The thrust element moves lengthways

when the spindle rotates. Depending on the direction of rotation,

the thrust element moves towards the base of the brake piston or

in the opposite direction. As a result, the brake piston is pressed

against the brake pad (braking position) or moved away by the

brake pad (release position).The brake and release operations are controlled in the same way as

in the EPB systems used in other Audi models. Deactivation of the

maximum clamping force of approx. 17.5 kN is controlled by

applying up to approx. 12A of electrical current. A temperature

model in the control unit calculates the cooling of the brake discs

and pads when the vehicle is parked and, if necessary, tightens the

parking brake up to three times by briefly activating the electric

caliper spindle

engagementWorm gear of

second gear stepWorm gear of

first gear stepElectric motor612_032Brake pistonBrake discThrust piece(spindle nut)Ball screwSpur gear of second

gear stepSpindleBrake piston in

release position612_033Brake padBrake piston in

braking position612_03413

Service operationsIn the Audi A3 ’13, the thickness of the outer brake pads on all

wheels can also be checked using test pin right wheel brakes of the front axle in the Audi A3 ’13 are

fitted with a brake pad wear indicator. The contact is attached to

inner brake pad on each of the brakes.612_035Brake padTest pinSince the control software for the electro-mechanical parking

brake is integrated in the ESP control unit in the Audi A3 ’13, the

service functions of the EPB can also be accessed under diagnostic

address 03. The address otherwise used for the EPB (053) is

replace the pads on the rear brakes, the corresponding function

on the vehicle diagnostic tester must be activated. The parking

brake is then opened as far as possible so that the brake pads can

be replaced. After replacing the brake pads, the parking brake is

closed and the required clearance between the brake pad and brake

disc is set fitting the new brake pads, care must be taken to ensure

that the locking pins on the back plates engage the brake piston

pockets.612_031!14NoteDue to the modified design of the EPB parking brake motors, the self-locking effect is no longer provided by the spindle in

the brake caliper, rather by the second gear step in the parking brake motor. As a consequence, the parking brake is released

as soon as the parking brake motor is detached from the brake caliper. To prevent the vehicle from rolling away, it is impor-tant that it be secured before disassembling the parking brake parking brake motors should only be removed on a level surface or hydraulic lift.

ESP overviewThe Continental ESP MK 100 system is used in the Audi A3. This

ESP system is a more advanced version of the ESP MK 60 system

used in the predecessor model, both in terms of its hardware and

software. The ESP unit is mounted on the right side member in the

engine versions of the ESP system are componentsControl unit J104The yaw rate sender G202, the transverse acceleration sender

G200 and the longitudinal acceleration sender G251 have been

integrated in the ABS control unit J104. This eliminates the need

for the ESP sensor unit G419 used in the predecessor the first time at Audi, the control software for the electro-mechanical parking brake has been integrated in the control l unit performance has been improved compared to the MK

60. This has been achieved by using new electronic components

and more advanced software.

The ESP communicates via the suspension CAN lic unitDepending on whether the vehicle is equipped with ACC or not, two

versions of the ESP system are used. A hydraulic unit with special

noise reduction features and a reinforced pump are used on vehi-cles with l unit J104Hydraulic unit612_037Continental ESP MK 10015

Speed sensor G44-G47Two active speed sensors are also used in the Audi A3 ’13. They are

identical to the sensors used in the Audi Q3

, both in terms of their design and function. There are two rear axle

sensor configurations. Active sensors with additional functions are

used in models equipped with park assist and/or ACC. These

sensors additionally record the direction of rotation of the wheels

and the clearance between the sender wheel and sensor.612_038System functionsThe Audi A3 ’13 has the same ESP system functions as its pred-ecessor model.A new feature is active brake pressure build-up for the optional ACC

function and for Audi pre sense brake the system registers a situation of impending vehicle instability

by evaluating the relevant sensor signals, the brake system is

\"prefilled\". A moderate build-up of brake pressure is initiated by

activating the ESP pump. The aim is to eliminate the brake clear-ance in order to reduce the system reaction time during a subse-quent braking brakes are also prefilled if an emergency braking operation is

initiated by the driver. During an emergency braking manoeuvre,

drivers usually take their foot off the accelerator pedal very quickly

and apply full braking. The movement of the accelerator pedal is

evaluated in order to detect an emergency braking Hill Start Assist function is optional with the Audi A3 ’13 for

the first time in this model series.A new function is the multicollision brakeThe function reduces the danger of skidding and the danger of

further collisions during an accident by automatically initiating a

vehicle braking operation. The function is active during head-on,

side and rear collisions if a predetermined deployment threshold is

exceeded. The airbag control unit then \"instructs\" the ESP to brake

the vehicle by means of a bus message. The ESP system then

builds up brake pressure at all four wheel brakes.A condition for activation of the function is that the vehicle is

travelling at a speed of greater than 10 kph during the collision.