Autonomous Speed Control of Over Speeding Vehicles Using Radio Frequency
Autonomous Speed Control of Over Speeding Vehicles Using Radio Frequency
Autonomous Speed Control of Over Speeding Vehicles Using Radio Frequency
ABSTRACT: This paper presents Autonomous speed control of over speeding vehicle using Radio Frequency. The
main objective is to design a controller and a display, meant for vehicle’s speed control and to monitor the zones, which
can run on an embedded system. Display & Control can be custom designed to fit into a vehicle’s dashboard, and
display information on the vehicle. The proposed system is composed of two separate units: Zone status transmitter unit
and receiver (speed display and control) unit. Whenever the vehicle is within the transmitter zone, the vehicle speed is
controlled by receiving the signal, i.e.., every time the vehicle speed is decreased by some cut off and kept constant
until the vehicle moves out of the transmitter zone, and then the vehicle can get accelerated by itself. The IR sensor
detects the speed of the vehicle and sends the information to Micro controller. Micro controller interacts with motors
through driver IC to take appropriate directions to prevent accidents.
KEYWORDS: RFID (Radio Frequency Identification), ECU (Engine control unit), RF(Radio Frequency), Over speed,
I. INTRODUCTION
80% of road accidents are caused by human error say senior police officials, according to a news report. Incidentally,.
The number of accidents for 1000 vehicles in India is as high as 35 while the figure ranges from 4 to 10 in developed
countries. The seriousness of running a red light traffic signal and speed violation on highways can be seen from the
statistics given in fig.1.1
The report, based on 2006 and 2012 statistics collected from 178 participating countries, said globally over 1.2 million
people die in road accidents every year and 20-25 million people suffer non-fatal injuries.
Within age groups, fatality rate increases sharply with increasing vehicle speed, as is illustrated in Figure 1.2 Overall,
pedestrians age 65 and older are more than 5 times more likely to die in crashes than pedestrians age 14 or less, and the
likelihood of death increases steadily for ages in between. For vehicle travel speeds above 45 mph, pedestrians above
age 65 die in about 5 of 8 crashes.
The main motive behind this paper is to reduce these reckless accidents for which we propose a system that governs
and controls the speed of the vehicle without any direct inconvenience to the driver. There are instances where the
speed of the automobile is beyond the expected speed limit or the driver does not obey the traffic signals. Thus we are
using RF technology.
We researched a lot over which RF module to be used and came to the conclusion that passive tags would not be
feasible as it cannot store multiple IDs and has a relatively less range thus we are using active RF module TWS 434 and
RWS 434 for our proposed system. The module has a range of 500 meters and fits within our application range. The
basic 8051 family of microcontroller is enough for our application and thus we are using 89S52 Microcontroller which
has 4 ports, two are used for Input and the rest 2 for output. Initially we decided to use two motors for our application
but the proposed system works well on only one motor. We are using a 300 watt motor which is driven by Motor driver
L293D. Our system requires speed to be displayed and we are using 16x2 LCD screen along with IR module to
determine the speed.
RFID reader is placed in the car which detects the tag within a particular range. The tags placed here contain specific
information. The tags which we use here are active tags (turns on only with the power supply).These are tags which
contain a particular unique code corresponding to the speed on the speed-limit sign boards. This particular reference
speed to which the vehicle’s speed has to be reduced to is transmitted by this tag to the RFID reader.
The modules in the proposed system are: RF transmitter consisting of a power source, an Encoder and RF transmitter
and Receiver module consisting of RF receiver circuitry connected to the microcontroller through a RF decoder for
establishing wireless communication. DC motors are interfaced with the motor driver which controls the motors
according to the information provided by the controller, The IR sensor is connected to controller for speed indication
which is displayed on the LCD screen.
We suggest two methods as shown below to control the speed of the vehicle. In case a red light signal situation occurs
the speed is reduced to zero, else it is reduced to the speed limit specified on the roads.
The start switch used here acts as an ignition switch which starts the engine. There are 3 main conditions that govern
the speed control of the vehicle.
First condition- is when the ECU is in switched OFF. This means that the RFID reader is out of the range of
the tag which in turn suggests that no red light traffic situation or speed limit condition is imposed. During
this time full supply goes to the Pump and Injector circuit of the vehicle
Second condition- the ECU is ON but the vehicle isin a speed limit range. In this case, the reader encounters
a speed limit transponder and the ECU sends a control signal to the relay and POT control which in turns
control the pumps and the injector circuit and thus there is a limited supply to pump and injector circuit.
VI. WORKING
The RF transmitting circuit consist of a RF transmitter module TWS434 TX interfaced with HT12E encoder and the
user can select the ID using binary logic .The voltage regulator circuit is obtains power from a 8 volt(1 A) battery
which provides the motor with unregulated 8 volt supply and whereas micro controller, motor driver, LCD and the
receiver module receives a 5 volt regulated supply. The IR sensor is used to determine the speed of the DC motor,
which sends the speed of the wheel to the microcontroller and displays it on the LCD display which is compared The
controlling device of the whole system is a Microcontroller to which RF receiver module is RWS 434 RX interfaced
with HT12D is connected; DC motors are interfaced through a motor driver. The IR sensor is used to determine the
speed of the DC motor. When the RF transmitter is turned on, the data set by the user is encoded and sent to the
Receiver module. The receiver module decodes the data and sends it to the AT89S52 micro controller to compare the
data embedded in the controller. If the speed of the DC motor is less than the limit zone, the Microcontroller compares
the data received from the IR sensor and data received from the RF transmitter. Then commands the motor driver to
take no actions and the speed of the DC motor remains same. If the speed exceeds the set speed limit, the
Microcontroller instructs the motor driver to limit speed according to the zone thus preventing accidents.
The representation below shows how the proposed system can be implemented
Fig 6.1 Over speeding Vehicle approaching Fig 6.2 Speed of vehicle controlled as it enters
Speed limit zone Speed limit zone
VII. RESULT
We conducted test to determine the most efficient angle, height and distance at which the tag can be installed.
D-Detected
ND-Not Detected
Fig.7.1 The above table shows the range of RF module at various angles.
We placed the Transmitter in the center and carried out readings within the 40 meter radius.
From the experiment we determine that the receiver could detect the transmitter from 0⁰ to 270⁰ efficiently up to 36
meter. Thus we can place the Tag on signals as well as speed limit sign board assuming the height of the board is ~3
meters at any angle.
The above prototype can be installed in vehicles which will reduce the speed automatically when the vehicle is about to
collide or is nearby another vehicle by implementing the transmitter and the receiver module in individual vehicle.
Incase the representation is shown in the figure below.
VII. CONCLUSION
This paper explains the smart vehicle control based on the RFID technology. It has explained how transponders and
readers can be used to communicate with the vehicle thereby providing autonomous vehicle control with the ECU. The
simulation technique for speed control has been given which is installed in almost all the upcoming vehicles. Thus we
hope this can revolutionize the traffic management and avoid accidents caused due to over speeding in the near future.
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