24-04-2012, 12:32 PM
An Automotive Security System for Anti-Theft
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INTRODUCTION
Automotive theft has been a persisting problem around
the world. In the US alone, 1,237,114 motor vehicles were
reported stolen in 2004, and the equivalent value of stolen
motor vehicles was $7.6 billion US dollar [1]. The
automobiles have been stolen for different reasons viz. for
using the vehicles for transport, commission of crimes and
for reusing or reselling parts dismantled from the vehicles or
resale of the vehicle itself. Various technologies have been
introduced in recent years to deter car thefts, for example,
Immobilizers [2] to remotely disable the lost vehicles,
Microdot Identification [3] to identify auto parts using
unique microdots, Electronic Vehicle Identification (EVI) [4]
to identify the vehicle against a registration database,
LoJack System [5] to use in-built transponders for tracking
down vehicle, GPS [6] to locate the position of the lost
vehicles using global positioning system, and so on.
IMPLEMENTATION
The implementation includes hardware design and
software programming described in the following subsections.
A. Hardware Design
The implementation of the system required integration
of many individual parts each capable of carrying out the
critical functions of the system. The system consists of a
single board computer (Soekris Net 4801), GSM modem
(iTegno GSM/GPRS modem) and multiple ECU boards
each with a PIC16F676 chip and integrated CAN adaptor.
Single Board Computer
The single board computer acts as the middle man
between the CAN network and the GSM modem. The C
program that runs on this keeps polling for messages both
from the serial port and GSM modem using different threads
A and B. It detects when an SMS is received and checks
whether it is Enable or Disable SMS and sends the
corresponding command through serial port to the master
ECU. Any messages from the master ECU in case of tamper
is also transmitted over the GSM modem as an SMS to the
automobile’s owner. This deals with the part for remote
disabling/enabling the automobile.
Master ECU - 4 Layers of Security
It is assumed that the master ECU is tamper proof
(Transfer Proof Unit – TPU) for our system. The master
ECU is responsible for transmitting the commands issued by
the single board computer to the rest of the networked ECUs
over CAN bus.
CONCLUSION
Our security technology is also very effective
solution to prevent the automobile stealing with the aim of
reselling key auto systems. This is achieved by introducing
four layers of security features written in the form of
firmware and embedded on the ECUs. Hence, our system
deters thieves from committing the theft because they will
gain little economic benefits from his theft in spite of the
risks he will be taking. Therefore, our automotive security
technology is a most effective anti-theft solution at current
stage. The experimental results show that the owner can
securely control his vehicle within a few seconds, and the
running time of our security software is acceptable.