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Full Version: Locking and Unlocking of Theft Vehicles Using CAN
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Abstract—Avoiding Vehicle Theft is making buzz in present
automobile industry. Design and development of a theft control
system for an automobile, can be achieved by making use of GPS
feature of mobile phone. The developed system makes use of an
mobile phone that is embedded in the vehicle with an interfacing
to Engine Control Module(ECM) through Control Area Network
(CAN) Bus, which is in turn, communicated to the ECM. The
vehicle being stolen can be stopped by using GPS feature of
mobile phone and this information is used by the owner of the
vehicle for future processing. The owner sends the message to the
mobile which is embedded in the vehicle which has stolen which
in turn controls the vehicles engine by locking the working of the
engine immediately. The developed system accept the message
and broadcasted to the Vehicle Network through CAN Bus. The
engine can be unlocked only by the owner of the vehicle by
sending the message again. The goal behind the design is to
develop security for vehicles and embedded system to
communicate with engine of the vehicle.


INTRODUCTION
Today’s Automobiles, invariably comply with digital
control systems as a consequence of constant growth in
technology. Recent Vehicles contains large number of
Electronic Control Systems and already there are large
numbers of Electronic Control Units present [1]. The growth of
automotive electronics is the result parties of the customers
wish for better safety and greater comfort and also for other
requirements like improved emission control and reduced fuel
consumption.
Electronic Control Units (ECUs) are increasingly being
deployed in automobiles to control one or more electronic
subsystems to realize various functions .When someone drives
a car there are many signals that are passed between the various ECU’s embedded inside the car. Output signals from an
Electronic Control Unit contain information about the current
state of the car as the driver interacts continuously with the car.
A modern day automobiles can consists up to 80 ECU’s,
sensing and taking tabs of the various parameters of the
automobiles [2]. This rapid and complex exchange of signals
ensures the proper functioning of the car.
Automotive industry uses Controller Area Network (CAN)
as the in-vehicle network for the Engine Management, the body
electronics like door and roof control, air conditioning and
lighting as well as for the entertainment control. Nowadays all
most all car manufacturers have also started implementing
CAN based vehicle automation.CAN networks used in engine
management to connect several ECUs [2].
A vehicle tracking system combines the installation of an
electronic device in a vehicle, or fleet of vehicles, with
purpose-designed computer software atleast at one operational
base to enable the owner to track the vehicle's location.
Collecting data in the process from the field and deliver it to
the base of operation. The terms cover a range of products
which, by use of communications technology, or a
combination of technologies, identify a stolen vehicle and its
real-time location and present this information to a Systems
Operating Centre (SOC) or to the police. Tracking systems
also continue to update the data and differentiate between a
particular stolen vehicle and all other vehicles, which may or
not be stolen. It is recognized that such systems may be a
facility within fleet management/logistics systems or part of
services known as vehicle telemetric. Modern vehicle tracking
systems commonly use GPS technology for locating the
vehicle and also other types of automatic vehicle location
technology can also be used. Vehicle information can be
viewed on electronic maps via the Internet or specialized
software.



CONTROLLER AREA NETWORK (CAN) BUS
Controller Area Network (CAN) is a serial data
communications bus for real-time applications, developed by
engineers at Bosch [5]. Evaluated existing serial bus systems
regarding their possible use in passenger cars and found that
none of the available network protocols were able to fulfill the
requirements of the automotive applications in 1980’s. CAN is
based on the “broadcast communication mechanism”, which is
based on a message-oriented transmission protocol. The
Controller Area Network (CAN) is used in a broad range of
embedded as well as automation control systems. Application
of CAN includes in the area of CAN in cars & Truck Engine,
Maritime Applications, Avionics System Networks, Building
Automation etc.
A. CAN Network in Automobiles
The use of a CAN Bus in Automobiles makes it possible to
network electronic devices such as control units or intelligent
sensors, provides the following advantages for the Vehicles as
an overall system:
1) Data exchange between control units take place on a
uniform platform.This platform is called a protocol. The CAN
Bus acts as a so-called data highway.
2) Systems involving several control units, e.g. ESP, can
be implemented efficiently.
3) System expansions are easier to implement in the form
of optional extras.
4) The CAN Bus is an open system which permits
adaptation to various transmission media such as copper or
optical fibre cables.
5) Control units are diagnosed via the K-wire. Inside the
car, diagnosis already takes place via the CAN Bus in some
cases (for example the airbag and the door control unit).In this
context, this is called a "virtual K-wire". In future cars, there
will be no K-wire.
6) A cross-system diagnosis is possible across several
control units.