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Project report-intelligent-breaking-system-
1. CHAPTER ONE
INTRODUCTION
1.1 NeedOf New System:
We have pleasure in introducing our new project “INTELLIGENT BRAKING
SYSTEM”, which is fully equipped by IR sensors circuit and Pneumatic braking circuit.
It is a genuine project which is fully equipped and designed for Automobile vehicles.
This forms an integral part of best quality. This product underwent strenuous test in our
Automobile vehicles and it is good.
The “SENSOR OPERATED BRAKING SYSTEM” can stop the vehicle within 2 to
3 seconds running at a speed of 50 KM. The intelligent braking system is a fully automation
project. This is an era of automation where it is broadly defined as replacement of manual
effort by mechanical power in all degrees of automation. The operation remains an essential
part of the system although with changing demands on physical input as the degree of
mechanization is increased.
Degrees of automation are of two types, viz.
1. Full automation.
2. Semi automation.
In semi automation a combination of manual effort and mechanical power is required
whereas in full automation human participation is very negligible.
Braking systems of commercial vehicles were always given the highest importance
concerning safety issues and in particular active safety. Due to different design and load
characteristics of these vehicles, different performance of their braking system especially
related to different wheel brakes and their tribological behavior are the main reasons why the
operation of their braking systems should be constantly monitored and controlled depending
on the driver’s demands and the adhesion characteristics between tyres and road.
Inappropriate braking of these vehicles may cause heavy accidents due to relatively longer
stopping distances and higher energy output of brakes particularly in the case of vehicle
combinations.
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2. Ever-increasing demands in term of responsiveness and control are being made on system for
brake and chassis management in commercial vehicles. The traditional medium used for brake
system (compressed air) can be now controlled with the speed and precision offered by
modern electronic abilities. Intelligent Braking System going to introduced in commercial
vehicles providing rapid brake response during parking for drivers and vehicle safety.
1.2 Objectives:
Intelligent Braking System has objectives as per following:
[1] As there is always problem regarding with parking of vehicle properly and with minimum
time.
[2] Many time driver unable to judge the proper distance between back side of vehicle and
obstacle during parking.
This parking problem tends to damage of vehicle most of time and cause
critical accident.
To provide safe parking.
To avoid damage of vehicle.
To provide comfort for driver with regarding parking purpose.
1.3 Functions:
Intelligent Braking System provides many useful functions:
1. It will provide safety for driver.
2. It will provide safety for rear side of vehicle during parking.
3. It will judge the proper and required distance between back side of vehicle and wall
for parking.
4. It will immediately give control signal to apply brake instantly.
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3. CHAPTER TWO
LITERATURE REVIEW
2.1 Project plan:
Intelligent Braking System means a braking system that provides a safety for vehicle
during the parking of vehicle in parking area. Many time it seems that the driver unable to
judge the obstacle at back side of vehicle during the parking of vehicle.
So, Intelligent Braking System introduced with the feature that avoid the damaging of vehicle
during the parking process.
The project, Intelligent Braking System is planning to introduce a new advanced system in
automobile market. Damaging During a parking of vehicle is quite major problem but until
there is no solution on this problem. So we introduced a new system that will avoid damaging
of vehicle during parking.
Intelligent Braking System will open up new and promising opportunities to engineer in
order of safety and discipline. Basic human being are many time unable to judge the accurate
and safe required distance during the parking in parking area.
2.2 Project scope:
Intelligent Braking System is introduced for providing safety and comfort to driver during
parking of car. The main aim of system is to avoid critical damage of vehicles at the time
parking. Most of time drivers unable to judge proper distance between car and obstacle, so
this system will helpful as well as important in car safety.
The intelligent braking system will open up a new ideas and concepts for automobile
industry
As the requirements of human beings for comfort and safe driving are increases. This system
is addition in regular safety system. And also increases the demand of vehicle in market view.
2.3 Resources:
For the making and developing of this project many raw materials, main components such
as 5/2 DC valve, pneumatic cylinder, connecting wires and tubes were required in list.
Required material for project were obtained from different hardware shops, electrical shop
and from near workshop. For making of this project, 5/2 dc valve, polyurethane tube, tube
connectors pneumatic cylinder were purchased from nearby hardware store.
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4. The frame material such mild steel angles and plates were purchased and obtained from
workshop.
Electronic equipments such as IR sensor, control circuit for valve were made by an skilled
electronic engineer and adapter for external power supply of DC motor, IR sensor and control
circuit were purchased from nearby electronic shop.
Welding of frame was done in welding workshop, circuit for control unit and sensor were
made by with the help of an electronic and telecommunication engineer.
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5. CHAPTER THREE
SYSTEM MODELING
Intelligent Braking System
Figure.3.1: Construction Detail
3.1 Constructionalfeature:
Whole assembly of “Intelligent Braking System” consists of following main parts:
3.1.1. Frame: Frame is made up of 40C8 material. Frame is generally made up in order of
required dimensions.
Dimension of frame:
Length: 500mm
Width: 400mm
Height: 150mm
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6. 3.1.2. Pneumatic Cylinder:
One pneumatic cylinder for braking purpose. Cylinder is mounted on rectangular bar.
Specification of cylinder:
Cylinder Sr. No. - 30825-95166
Bore:- 25mm
Stroke: - 50mm
3.1.3. Solenoid Valve:
One solenoid valve of 5/2 DC valve for controlling of pneumatic cylinder. Valve consists of
5 ports and 2 positions. Valve is mounted on frame and valve ports are connected to cylinder
by using polyurethane tube.
3.1.4. D.C. Motor:
One D.C. motor is mounted on one wheel to provide free rotation of wheels.
Specification of motor:
Torque: 200rpm
Volt: 12V DC
3.1.5. IR sensorand control unit:
IR sensor unit is mounted at back side of frame. External power supply is provided to IR
sensor. Control unit is connected to solenoid valve in order to actuation of valve.
3.1.6. Working Wheel:
Two working wheels of free rotation are mounted on both end of metal shaft. Two ball
bearings are provided for smooth rotation of both wheels and both ball bearings are mounted
on rectangular bar.
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7. 3.2 Working of system
Intelligent Braking System is work on principle “of working of clutch and braking system
through pneumatic pressure which is equipped by using IR sensor circuit.”
Wheels are continuously rotating in clockwise direction as the motor is connected to the
wheel.
IR circuit consists of one transmitter called as ‘IR Transmitter’ and one receiver called as
‘IR Receiver’. IR Transmitter continuously transmitting the Infra Red rays. If any obstacle
is there in a path, the Infra-Red rays reflected. This reflected Infra-Red rays are received by
the IR Receiver. The IR Receiver circuit receives the reflected IR rays and giving the control
signal to the control circuit. The control circuit is used to activate the solenoid valve.
As the solenoid valve activated it will allow passing the air from compressor to cylinder
through the connecting tube.
High pressure of air move the piston to outside of the cylinder and shaft of the piston come in
contact of rotating wheel and thus brake applies and wheel stop rotating.
POWER CONTROL IR
SUPPLY UNIT TRANSMITTER
FLOW
IR
RECEIVER
CONTROL SOLENOID
VALVE VALVE
AIR
PNEUMATIC BRAKE
COMPRSSOR
CYLINDER APPLY
Figure.3.2: Flow diagram of system
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8. 3.3 Component diagram
System consists of following main component:
1. Frame
2. Pneumatic Cylinder
3. Solenoid valve
4. D.C. Motor
5. IR Sensor
3.3.1. Frame:
Figure.3.3: Frame
Dimension of frame:
Length: 500mm
Width: 400mm
Height: 150mm
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9. 3.3.2 Pneumatic cylinder:
Figure3.4: Pneumatic cylinder
Specification ofcylinder:
Cylinder Sr.No.:30825-95166
Bore:-25mm
Stroke:-50m
3.3.3 Solenoid Valve:
Figure.3.5: 5/2 dc valve
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10. Specification 5/2 DC VALVE:
P = inlet port of valve
A and B = work passages port of valve
R1 = air exhaust port 1
R2 = air exhaust port 2
Symbol of 5/2 DC Valve:
Figure3.6: Symbol of 5/2 dc valve
3.3.4. DC Motor:
Figure.3.7: DC motor
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11. Specification of DC motor:
Voltage : 12 VDC
Output Power: 1.1 W
Gear Ratio : 1:20 or 1:60
For Gear Ration
Rated Speed: 200 RPM (for gear ratio 1:20)
58 RPM (for gear ratio 1:60)
Rated Torque: 7.84 N.cm (for gear ratio 1:20)
25.4 N.cm (for gear ratio 1:60)
Rated Current: 0.41 A
Encoder Resolution: 60 counts per revolution
Weight: 160 g
Diameter: 37 mm
Shaft diameter: 5.5 mm
3.3.5. IR Sensor:
Figure.3.8: IR sensor
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13. 3.4 Materialrequirement
Used materials and their properties:
The materials used in this project are detailed as follows:
Ferrous materials
MILD STEEL
EN-4 TO EN-6
[1]Carbon- 0.15% to 0.35%
[2]Tensile strength-1200/1420 MPA
[3]Yield strength-750/1170 MPA
40C8
[1]Vehiclebon-0.25% to 0.35%
[2]Tensile strength-620 MPA
[3]Yield strength-400 MPA
Non metallic materials
The non metallic materials are use in engineering practice due to their low density, low cost,
flexibility, resistance to heat and electricity. Though there are many non metallic materials,
important materials used in our project are list below:
Rubber
It is one of the most important natural plastics. It resists abrasion, heat, strong alkalis, and
fairly strong acids. Soft rubber is used for electrical insulations. It is also used for power
transmission belting, being applied to woven cotton as a base. The hard rubber is used for
piping and as lining for pickling tanks dimensional stability. They are mostly use in
manufacture of aero planes and automobile parts. They are also used for making safety
glasses, laminated gears.
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14. The systemconsists of following materials:
1. Angle of cast iron material selected for frame purposed. Angle of 25×5 selected for frame.
Angles cut in following dimensions:
2 Nos. 500mm in length
2 Nos. 400mm in length
4 Nos. 150mm in length
All these parts are welded together in order to making of frame for supporting all assembly of
system.
2. Two rectangular bar used for supporting of wheel shaft, cylinder and bearings.
Both bars are made up cast iron material. Bar in size of 120mm×50mm×10mm.Both bars are
welded on frame in vertical direction. One hole is provided for bearings mounting purposed.
3. Two ball bearings are selected of the standard 6000 ball bearings.
These bearings are mounted in hole of rectangular bar.
Outside diameter of selected bearing is 25mm and internal diameter is 10mm. Bearings are
provided for smooth working of wheels during actual working of system.
4. One shaft of cast iron material is used for mounting of wheels. Shaft is cut in required
dimensions as per the attachment of wheels. Diameter of shaft is 10mm and 6mm at
both ends.
5. Polyurethane tubes are used for connecting solenoid valve ports to cylinder ports.
Diameter of tube is 6mm. Connector are used to connect the tube to port and avoid the
air leakage.
6. One pneumatic cylinder is used for braking purposed. Cylinder is operated through
compressed air from compressor.
Inlet port of cylinder is connected to port ‘B’ of solenoid valve and outlet port is connected
to ‘A’ port of solenoid valve.
7. One solenoid valve is used for controlling the passage of air toward the cylinder and
forward and backward moment of piston.
Main port of valve, inlet port is connected to compressor discharged port. Port ‘A’ and ‘B’
are connected to cylinder. For actuation of valve, a connection of control circuit is given to
valve. 8. One DC motor is used to free rotation of wheels during working.
External power supply is given to motor and motor is attached to one wheel out of both.
9. IR sensor is used for detection of obstacles and connection of IR circuit is given to
control unit which further activate the solenoid valve.
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15. 10. One compressor is used in system for purposed of air which required for braking system.
The compressor pressured should be within 2-5bar.
Photograph 3.4: sensor operated intelligent braking system
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16. CHAPTER FOUR
PERFORMANCE ANALYSIS AND TESTING
4.1 Technicalspecificationsofcomponent used in system
4.1.1. Specification of Pneumatic Cylinder:
Force:
To determine the size cylinder that is needed for a particular system, certain
Parameters must be known. First of all, a total evaluation of the load must be made.
This total load is not only the basic load that must be moved, but also includes any
Friction and the force needed to accelerate the load. Also included must be the
force Needed to exhaust the air from the other end of the cylinder through the
attached Lines, control valves, etc. Any other force that must be overcome must
also be Considered as part of the total load. Once the load and required force
characteristics are determined, a working pressure should be assumed. This
working pressure that is selected must be the pressure seen at the cylinder's piston
when motion is taking place. It is obvious that cylinder's working pressure is less
than the actual system pressure due to the flow losses in lines and valves.
With the total load (including friction) and working pressure determined, the
cylinder size may be calculated using Pascal's Law. Force is equal to pressure being
applied to a particular area. The formula describing this action is:
Force = Pressure * Area
Force is proportional to pressure and area. When a cylinder is used to clamp
or press, its output force can be computed as follows: F = P * A P = pressure
(PSI (Bar) (Pascal's))
F = force (pounds (Newton’s))
A = area (square inches (square meters))
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17. Figure.4.1: Pneumatic cylinder
Table.4.1: Component of pneumatic cylinder
Sr Component Material
No.
1 Piston rod High alloy stainless steel
2 Bearing cap Wrought aluminum alloy
3 Cylinder barrel High alloy stainless steel
4 End cap Wrought aluminum alloy
Speed:
Speed of the piston rod depends upon floe rate of air. The volume per seconds entering in the
cylinder must be change in volume per second inside. It follows than that:
Q m^3/ s = Area X distance moved per
second Where,
Q is the volume of compressed air and this change with the pressure.
Power:
Mechanical power is defined as the Force X velocity. This makes easy to calculate the power
of the cylinder. Compressed air power is more than the mechanical power output because of
friction between sliding parts.
P = F v watts
Basic principle:
Figure.4.2 Shows some of the basic principles of drawing pneumatic circuit diagrams, the
Numbers in the diagram correspond to the following points:
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18. Figure.4.2: Principle diagram of pneumatic cylinder
1. When the manual switch is not operated, the spring will restore the valve to its
original Position.
2. From the position of the spring, one can deduce that the block is operating. The other
block Will not operate until the switch is pushed.
3. Air pressure exists along this line because it is connected to the source of compressed air.
4. As this cylinder cavity and piston rod are under the influence of pressure, the piston rod
is In its restored position.
5. The rear cylinder cavity and this line are connected to the exhaust, where air is released.
4.1.2. Specification of DC Motor:
DC motors consist of one set of coils, called armature winding, inside another set of coils or a
set of permanent magnets, called the stator. Applying a voltage to the coils produces a torque
in the armature, resulting in motion.
Stator:
The stator is the stationary outside part of a motor.
The stator of a permanent magnet dc motor is composed of two or more permanent magnet
pole pieces.
The magnetic field can alternatively be created by an electromagnet. In this case, a DC coil
(field winding) is wound around a magnetic material that forms part of the stator.
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19. Rotor:
The rotor is the inner part which rotates.
The rotor is composed of windings (called armature windings) which are connected to the
external circuit through a mechanical commutator.
Both stator and rotor are made of ferromagnetic materials. The two are separated by air-gap.
Winding:
A winding is made up of series or parallel connection of coils.
Armature winding - The winding through which the voltage is applied or induced.
Field winding - The winding through which a current is passed to produce flux (for the
electromagnet)
Windings are usually made of copper.
Torque developed:
The equation for torque developed in a DC motor can be derived as follows.
The force on one coil of wire F =i l x B Newton
Note that l and B are vector quantities
Since B = θ/A where A is the area of the coil,
Therefore the torque for a multi turn coil with an armature current of Ia:
T = K θ Ia (2)
Where θ is the flux/pole in weber, K is a constant depending on coil geometry, and Ia is the
current flowing in the armature winding.
Note: Torque T is a function of force and the distance, equation (2) lumps all the constant
parameters (Eg. Length, area and distance) in constant K.
The mechanical power generated is the product of the machine torque and the mechanical
speed of rotation, ῳm
Or, Pm = ῳm T
= ῳm K ῳ Ia (3)
It is interesting to note that the same DC machine can be used either as a motor or as a
generator, by reversing the terminal connections.
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20. Voltage: 12 VDC
Output Power: 1.1 W
Gear Ratio:
1:20 or 1:60
For Gear Ration
Rated Speed:
200 RPM (for gear ratio 1:20)
62 RPM (for gear ratio 1:60)
Rated Torque:
8.84 N.cm (for gear ratio 1:20)
28.4 N.cm (for gear ratio 1:60)
Rated Current: 0.41 A
Encoder Resolution: 60 counts per revolution
Weight: 160 g
Diameter: 37 mm
Shaft diameter: 5.5 mm
Figure.4.3: DC motor
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21. 4.1.3 Specification of IR sensor:
Infrared radiations is the electromagnetic waves in the wavelength region longer than the
visible light wavelength, lying from 0.75µm to 100µm. the wavelength. Region of 0.75µ to
3µm is called as near infrared, the region of 3µm to 6µm is called as middle infrared, and the
region of 6µm to 15µm is called as far infrared.
An infrared radiation has the following characteristics:
1. Invisible to human eyes.
2. Small energy.
3. Long wavelength.
4. Emitted from all kinds of objects or obstacles.
A typical system for detecting infrared radiations consists of following parameters:
1. Infrared sources: infrared sources include blackbody radiations , tungsten lamps,
silicon carbide and other sources. In addition of these radiant sources, infrared lasers
that emit infrared energy of a specific wavelength are used .
2. Transmission media: Typical Ex. Of infrared transmission media include the
atmosphere and optical fibers. The bandwidth from 3µm to 5µm and 8µm to 12µm,
where the rate of absorption is lower, are sometime called as ‘atmospheric windows’
and are often used for sensing application
3. Optical system: to coverage of focus infrared radiations, optical lenses made up of
quartz, CaFe2, Ge and Si, polyethylene Fresnel lenses, mirrors made up AL,AU
materials are use according to wavelengths.
4. Detector: there are two types of infrared detector, one is thermal type which has no
wavelength dependence, and second one quantum type that is wavelength dependent.
5. Signal processing: signal output from detector generally small and needs to amplified.
When designing preamplifier, it is necessary to consider impedance that match the
detectors, low noise and bandwidth. If the detector is cool, it is also cooled the
amplifier.
Intelligent Braking System Page 21 of 30
22. 4.1.4 Specifications of polyurethane tubes:
Figure.4.4: Polyurethane tube
Features:
The polyurethane tube, featuring excellent flexibility, helps compact piping requiring small
bending radius.
Tubes come in a variety of colors so that piping’s can be identified by color or can be
completed in the same colors as the devices.
Specifications:
Fluid Admitted- Compressed air
Serviced pressured gauge- 0~100psi(0~0.7Mpa)
Working vacuum: -29.5in Hg(-100Kpa)
Service temperature range: -5~140C (no freezing)
Model designation:
Ex. UB 0640 – 20 B
UB-model code
0640-tube diameter (outer diameter/inner diameter)
20-tube length
B-tube colour
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23. 4.1.5 Specifications of Direction Control Valve:
Directional control valves start, stop or change the direction of flow in compressed air
applications. Valves are designed for different applications and a factory may use several
different types of valves with each being suited for a particular job.
Figure.4.5: 5/2 direction control valve
Material Used:
Body: aluminum
Actuator: zinc die cast
Spool : stainless steel
Bushes : brass
Seals: viton (valve body) Nitrile (solenoid)
Technical information:
Type: spool valve
Style body: ported
Port size: g1/8
Mounting: any plane
Temperature range: -100c to +550c
Pneumatic information:
Pressure range: vacuum to 10 bar
Minimum spring return: 3 bar
Nominal: ø 3,2mm
Intelligent Braking System Page 23 of 30
24. 4.2 CostEstimation:
Table.4.2: Raw material cost
Sr. No Description Qty Material Cost
01 Pneumatic cylinder 01 STD 2500
02 Auto 5/2 valve 01 STD 2000
03 Bearing 02 STD 150
04 Bearing housing 02 EN-9 250
05 Bush material 02 EN-9 50
06 Pneumatic connector 05 STD 350
07 Angels ......... M.S. 600
08 Pneumatic tubes STD 120
09 Shaft material ......... M.S. 150
10 Sensor and electrical parts STD 5000
11 Nuts and bolts ............ STD 100
11270/-
Table.4.3: Operation Cost
Operation Rate Rs/hr Total time hrs Total cost
Milling 110 1.25 HRS 140
Lathe 90 2.35 HRS 220
Drilling 10r / drill ................ 60
Cutting 40 ............... 150
Total 570/-
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25. Table.4.4: Miscellaneous cost
Operation Cost
Gas cutter 150
Fabrication 700
Total 850/-
Table.4.5: Machining cost
Grinding 150
Hardening 85
Fuel charges 700
Color charges 200
Total 1135/-
Total cost: - Row Material cost + Machine cost + miscellaneous cost + cost of Parches cost +
overhead the total cost of m/c = 13825/- only
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26. CHAPTER FIVE
PROCESS SHEET
Process sheet generally consists of the total operation required and carried on each component
during the designing and developing the project.
Process sheet for various parts used in project as per following order:
5.1 Process sheet No.01
Part name: bearing mounter-1
Part weight- 1 kg
Part material- M.S
Part quantity-2 Nos.
Part size- 120mm×50mm×10mm
Table.5.1. Process sheet for bearing mounter
Sr. No Operation Machine Tool Time
01 Cutting the material as per our Power Hacksaw blade 10 min
required size. Hacksaw
02 Drilling 10mm hole. Lathe Drilling bit 10 min
machine 10mm
03 Make diameter 26mm. Lathe Boring tool 15 min
machine
Same operations are carried out for another bearing mounter.
5.2 Process sheet No.02
Part name: lower frame
Part material - M.S
Part quantity-1
Part size-2 nos of 500mm × 400mm and 4nos. 150mm
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27. Table.5.2: Process sheet for frame
Sr. Operation Machine Tool Time
No.
1 Cutting the material as per our Power Hacksaw blade 40
required size. hacksaw min
2 Welding of a frame Arc welding Welding 40
holder min
5.3 ProcesssheetNo.03
Part name: -wheel connecting shaft
Row Material Size: - Ø 265×12mm
Material :-EN9
Quantity : - 01 Nos.
Table.5.3: Process sheet for wheel connecting shaft
Sr. No. Operation Machine Tool Time
1. Clamp Stock on Lathe Lathe Single Pointe 10 min
Cutting Tool
2. Wheel shaft size Through Thickness Lathe Single Pointe 10 min
Cutting Tool
3. Shaft size Ø 12 Through Thickness Lathe Single Pointe 15 min
Cutting Tool
4. Shaft finishing Ø10 Through Lathe Finishing Tool 15 min
Thickness
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28. CHAPTER SIX
CONCLUDING REMARKS
6.1 Conclusion and Result:
[1] Intelligent braking system is the braking system of future. The interdisciplinary
interaction of mechanic and electronics provides its greatest benefits –sensors, valves and
pneumatic cylinder work together and allow totally novel, highly dynamic brake.
[2] In this system, Sensors unit sense the obstacle which cannot be judge easily by basic
human beings. This sensor gives control signal and process of application of brake is done
within the few seconds.
[3] The intelligent braking system is useful in avoiding the damage and accidents occurs
during the parking of vehicle in parking side specially when driver parking a vehicle from rear
side
6.2 Advantage Disadvantage And Application Of System:
6.2.1 Advantage of system:
[1] Avoid damage and accidents during parking of vehicle.
[2] Brake cost will be low.
[3] Less power consumption system
[4] Free from wear adjustment.
[5] As the system consists of pneumatic operations, whole system will pollution free.
[6] Installation is very simple and less costly
[7] System will open up new ideas and opportunities in automobile industry
6.2.1 Disadvantages of system:
[1] As the pneumatic parts are quite costly, system will required additional cost.
[2] If there is fault in working of sensor or control circuit, will create problem in system. So
its better way that sensor should be properly installed
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29. 6.2.2 Applications of system:
[1] As there is major problem happens during the parking of vehicle that vehicle damage or
critical accidents. So this system is applicable in modern as well as regular vehicle as the
parking system.
[2]This system is also applicable in automobile industry, as advanced breaking system.
6.3 Future scope of system:
The regular demands and requirements of human beings are increases for comfort and safe
driving.
Most of time it seems that the problem is creates during parking of vehicle.
Driver unable to judge the actual and approximate distance at such time which results into
damage of vehicle or serious accidents.
Thus this advance system in breaking will open up new concept to automobile industry. There
is no recent research on parking problems so this system will helpful to over come from such
problems.
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30. REFERENCES
[1] Adams, N.D., et al., 1996, Warehouse & Distribution Automation Handbook, McGraw-
Hill.
[2] Apple, J.M., 1972, Advanced Braking System Design, New York: Ronald.
[3] Bartholdi, III, J.J., and Hackman, S.T., 2011, Warehouse & Distribution Science,
version0.95, http://www.isye.gatech.edu/~jjb/wh/book/editions/wh-sci-0.95.pdf.
[4] Frazelle, E., 2002, World-Class Warehousing and Automated System, S.T. Jhonson.
[5] Kulwiec, R.A., Ed., 1985, Pneumatic Controls Handbook, 2nd Ed., New York: Wiley.
[6] Mulcahy, D.E., 1994, Electronic Sensors & Control Unit Handbook, McGraw-Hill.
[7] Mulcahy, D.E., 1999, Industrial Handbook, New York: S.T. Jhonson
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