Security System for Car using CAN Protocol

The design consist of a central "Airbag control unit"(ACU) controls a number of related sensors within the vehicle like accelerometers, impact sensors, wheel speed sensors, gyroscopes, brake pressure sensors, and seat occupancy sensors. When the requisite 'threshold' has been reached or exceeded, the airbag control unit will trigger the ignition of a gas generator propellant to rapidly inflate a nylon fabric bag. The inflated airbag reduces the deceleration experienced by the passenger during the crash through the process of venting gas out of small vent holes in a controlled manner absorbing the energy of the occupant impacting the bag. CAN is a serial communication protocol. The CAN bus may be used in vehicles to connect engine control unit and transmission , or (on a different bus) to connect the door locks , climate control , seat control.

central "Airbag control unit"(ACU) controls a number of related sensors within the vehicle like accelerometers, impact sensors, wheel speed sensors, gyroscopes, brake pressure sensors, and seat occupancy sensors. When ached or exceeded, the airbag control unit will trigger the ignition of a gas generator propellant to rapidly inflate a nylon fabric bag. The inflated airbag reduces the deceleration experienced by the passenger during the crash through ing gas out of small vent holes in a controlled manner absorbing the energy of the occupant impacting the bag. CAN is a serial communication protocol. The CAN bus may be used in vehicles to connect engine control unit (on a different bus) to connect the door locks , climate control , seat control.

CAN
Bus protocol, MEMS, s have continually by integrating components.
progressed, the vehicles became more as electronic components replaced provided additional features.
vehicles contained was necessary to electronic components. Due to the vast amount of wiring, an aftermarket installation requires the installer not only to understand how the integrated systems communicate with each other, but also requires numerous connections to be made throughout the vehicle. To make matters worse, the vehicle wiring differs between vehicle years, makes, and even models.
As a result, installers need to be highly knowledgeable and perform intensive labor for the most trivial after market equipment or the installation shop experiences countless h troubleshooting and sometimes even expensive claims for damaged OEM equipment.
An airbag is part of a vehicle's safety restraint system, a flexible envelope designed for rapid inflation in an automobile collision, to prevent vehicle occupants from striking hard interior objects such as steering wheels. It is considered a "passive" sa not requiring any input or action from the user, rather than an "active" component Ramtek, Nagpur, Maharashtra, India Due to the vast amount of wiring, an aftermarket installation requires the installer not only to understand how the integrated systems communicate with each other, but also requires numerous connections to be made throughout the vehicle. To rse, the vehicle wiring differs between vehicle years, makes, and even models.
As a result, installers need to be highly knowledgeable and perform intensive labor for the most trivial after market equipment or the installation shop experiences countless hours of lost time on troubleshooting and sometimes even expensive claims for damaged OEM equipment.
An airbag is part of a vehicle's safety restraint system, a flexible envelope designed for rapid inflation in an automobile collision, to prevent vehicle occupants from striking hard interior objects such as steering wheels. It is considered a "passive" safety component not requiring any input or action from the user, rather than an "active" component -such as a seat belt, International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470 Page: 5 which requires fastening. "Airbag control unit"(ACU) has a number of related sensors inside the vehicle such as accelerometers, impact sensors, wheel speed sensors, gyroscopes, brake pressure sensors, and seat occupancy sensors. In this there are two nodes. The one node is connected to the accelerometer and keypad. The other node would be connected to the relay. The PIC microcontroller would be used for the Node 1 and Node two. The MCP2551 transceiver would be used as CAN transceiver. The two nodes would be connected on the CAN bus. In this project there would be two sections Node1 and Node2. The Node1 part would contain the MEMS sensors. The sensor output would be connected to the PIC microcontroller. The PIC would be connected to the CAN transceiver.
The Node2 would contain the graphics LCD would display the sensor values. The Node2 would also be connected to the relay which will control the pump. Whenever the sensor data will exceed the set valve the will be send on the CAN bus and will trigger the relay and on the pump.

CAN PROTOCOL OVERVIEW:
CAN result, installers need to be highly knowledgeable and perform intensive labor for the most trivial after market equipment or the installation shop experiences countless hours of lost time on troubleshooting.

.2.AFTER CAN BUS:
By reducing the vehicles wiring by 2km, the vehicles overall weight was significantly reduced by at least 50kg and using only half the connectors. For the first time, each of the vehicles systems and sensors were able to communicate at very high speeds (25kbps -1Mbps) on a single or dual-wire communication line as opposed to the previous multi-wire looms. However, the introduction of CAN Bus also increased the vehicles complexity and made after market installations even more difficult and in many cases impossible to perform.

Airbag Systems in Automobiles:
An airbag is part of a vehicle's safety restraint system, a flexible envelope designed for rapid inflation in an automobile collision, to prevent vehicle occupants from striking hard interior objects such as steering wheels. It is considered a "passive" safety component not requiring any input or action from the user, rather than an "active" component -such as a seat belt, which requires fastening.

Airbag Inflation
When the frontal part of airbags deployed, a signal will be sent to the inflator unit within the control unit of airbag system. An igniter will start with a rapid chemical reaction generating primarily nitrogen gas (N 2 ) which will fill the airbag making it to deploy through the module cover.

MEMS
Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through micro fabrication technology. While the electronics are fabricated using integrated circuit (IC) process sequences (e.g., CMOS, Bipolar, or BICMOS processes), the micromechanical components are fabricated using compatible "micromachining" processes that selectively etch away parts of the silicon wafer or add new structural layers to form the mechanical and electromechanical devices.

Conclusion
CAN uses its bandwidth efficiently and the access to the Bus is organized according to the priorities of the individual modules. The successor of the CAN Bus will be Flex ray, which has in addition Time -and Frequency-Mux capabilities. But CAN will coexist for at least the next one or two decade. Therefore it is very suitable for applications where real-time capabilities are needed.

ACKNOWLEDGEMENT
We sincerely like to thank all the people who have directly and indirectly encouraged us and helped us in working out our research. Also a big thank to K.I.T.S. College from where we got complete support.