Brzdové systémy
–
Brzdový posilovač silničních
silni
vozidel
Ing.. Petr Ka
Ing
Kašpar
špar,, DiS.
DiS.
1
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Brake system – general overview
ABS / ESP unit
Brake tubes
Brake hoses
Brake booster
Brake pedal
2P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake caliper
VACUUM BRAKE BOOSTER
Reservoir
Booster
TMC
section
Kosmetické závady
Odřený lak BKV
Tandem Master Cylinder
3P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake booster
position
Tandem Master Cylinder
SECONDARY circuit
(Volume, Pressure)
PRIMARY circuit
(Volume, Pressure)
•
Mechanical Foot-force transformation into Hydraulic brake pressure
•
distribute uniformly hydraulic brake pressure on all four wheel brakes
•
distribute uniformly hydraulic brake fluid volume to control wheel brakes
4P. Kaspar, 25TE, January 24, 2006 © Continental AG
Foot-force
Tandem Master Cylinder – Output characteristic
5P. Kaspar, 25TE, January 24, 2006 © Continental AG
Stages in TMC developement
TMC with 2 center valves
(Series since 1993)
Additional requirements
•
crash optimization
•
suitable for active Boosters
(Brake assistent + ICC)
Plunger - TMC - Generation 2
(since 2004)
Additional requirements
•
further packaging improvement
•
weight reduction
•
standardisation
Plunger – TMC – Generation 1
(since 1998)
6P. Kaspar, 25TE, January 24, 2006 © Continental AG
Two center valves TMC
X
Detail
7P. Kaspar, 25TE, January 24, 2006 © Continental AG
Plunger – 1 generation
8P. Kaspar, 25TE, January 24, 2006 © Continental AG
Plunger – 2 generation
9P. Kaspar, 25TE, January 24, 2006 © Continental AG
Technical data for TMC types
TMC
2 center valves
Plunger Generation
1
Plunger Generation
2
Number of parts (pcs.)
27
27
15
Weight (g)
540
620
500
Diameter of valves
(mm)
10P. Kaspar, 25TE, January 24, 2006 © Continental AG
∅20.64 - ∅26.99 ∅22.2 - ∅25.4
∅20.64 - ∅26.99
TMC with Brake Light Switch (BLS)
Brake Light
Switch
Magnet
11P. Kaspar, 25TE, January 24, 2006 © Continental AG
VACUUM BRAKE BOOSTER
Reservoir
Tandem Master Cylinder
12P. Kaspar, 25TE, January 24, 2006 © Continental AG
Booster
Reservoir
section
Brake booster
position
Reservoir types
13P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake booster reservoir
S – secondary chamber
P – primary chamber
1 – connector
2 – reed contact
3 – floater
4 – input / output ports
14P. Kaspar, 25TE, January 24, 2006 © Continental AG
VACUUM BRAKE BOOSTER
Reservoir
Booster
Booster
section
Kosmetické závady
Odřený lak BKV
Tandem Master Cylinder
15P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake booster
position
Type of booster size
Tandem booster
Single booster
SINGLE BOOSTERS: 8’’, 9’’, 10’’, 11’’
TANDEM BOOSTERS: 8/9’’, 9/10’’, 10/11’’, 11’’
16P. Kaspar, 25TE, January 24, 2006 © Continental AG
Type of booster design
CONVENTIONAL
TIE - ROD
FRONT - BOLT
17P. Kaspar, 25TE, January 24, 2006 © Continental AG
Advantages of Tie–Rod booster
Conventional Booster 10“
F
F
Tie Rod Booster 10“
F
Advantages Tie Rod Booster
less weight
crash improving shells
less deflection
=> shorter pedal stroke
=> better pedal feel
18P. Kaspar, 25TE, January 24, 2006 © Continental AG
F
Type of booster function
CONVENTIONAL
DUAL RATIO
ADAM
ACTIVE
FUNCTION:
FUNCTION:
FUNCTION:
FUNCTION:
CONVENTIONEL
DUAL RATIO FUNCTION
(PERMANENT)
BRAKE ASSIST
BRAKE ASSIST
INCLUDING TRAVEL SIGNAL
19P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake booster function
LÖSESTELLUNG
RELEASED
POSITION
TEILBREMSSTELLUNG
BRAKING POSITION
Vacuum connection
Booster spring
Fixating screws
Reaction washer
Valve piston
Filter
Dust boot
Control housing
Push rod
Wedgel
Diaphragm
Stiffening plate
Vacuumcylinder
Diaphragm plate
Crimping
20P. Kaspar, 25TE, January 24, 2006 © Continental AG
Housing
Vacuum chamber
Working chamber
Brake booster function
VOLLBREMSSTELLUNG
FULLY APPLIED POSITION
RETURN
POSITION
RÜCKLAUF
Vacuum chamber
Working chamber
Vacuum
Vakuum
AtmosphärenAtmosphere press.
druck
Teilvakuum
21P. Kaspar, 25TE, January 24, 2006 © Continental AG
Brake booster function
FBooster. = ∆p × A
Vacuum
connection
FBooster
Pedal
TMC
FOutput
FInput
FBooster
Fire-wall
22P. Kaspar, 25TE, January 24, 2006 © Continental AG
FFoot
Outpt force [N]
Brake booster characteristic
Input force [N]
23P. Kaspar, 25TE, January 24, 2006 © Continental AG