An Analysis of Network-Based Control System Using Controller Area Network (CAN) Protocol

Abstract : Active safety is an important feature of a modern vehicle to provide precaution warning or compensatory control before the pre-crash stage of vehicle safety. All vehicle signals and information are acquired by several in-vehicle sensors on ECUs or surrounding vehicles, and integrated in vehicle gateway through in-safely with the cooperative driving mechanism. The demonstration system consists of a vehicle gateway, which is based on a PIC processor. After reaching within the communication limit, the vehicles set up time synchronization and then exchange vehicle information.The cooperative driving is fulfilled by sharing the vehicle information and emergency warning through wireless communication, soa driver can be aware of the dangerous situation.vehicle or vehicle-to-vehicle communications. The information exchanged among the host and surrounding vehicles provides comprehensive vehicle and driving status of each vehicle, so the driver can drive more.

 EXISTING SYSTEM :

 ? When the Interframe space is being transmitted, no node on the network is allowed to transmit any of the frames except the overload frame. ? Common-mode noise of varied magnitudes exists within the networks associated with CAN applications. ? The fault confinement feature in the CAN protocol differentiates between a temporary error and a permanent failure of a node. ? If the error is due to permanent failure of the node, it automatically detaches the defective node from the bus without causing any problems to the network.

 DISADVANTAGE :

 ? The main problem with the multiplexed communication system was it could not communicate data in real time. ? If the error is due to permanent failure of the node, it automatically detaches the defective node from the bus without causing any problems to the network. ? The PC analyzes the data and issues corresponding instructions to the control circuitry through the microcontroller. ? The increased number of connections posed serious reliability, fault diagnosis, and repair problems during both manufacture and in service.

 PROPOSED SYSTEM :

 • In order to improve the control system design and reduce the wiring, a Controller Area Network (CAN) control system has been implemented which is very flexible and reliable. • The intended purpose of the remote frame is to solicit the transmission of data from another node. • A PC is used to give instructions through a microcontroller to the control circuitry of the vehicle based upon the data from sensor equipment (LIDAR and GPS). • Its robust, low cost and versatile technology made CAN applicable in other areas of applications where inter processor communication or elimination of excessive wiring is needed.

 ADVANTAGE :

 ? Its cost, performance, and upgradeability provide for tremendous flexibility in system design. ? It has System wide message consistency because of efficient error detection & management mechanism. ? It defines a standard for efficient and reliable communication between sensor, actuator, controller, and other nodes in real-time applications. ? The propagation delay of a signal in the internal loop from the driver input to the receiver output is typically used as a qualitative measure of a CAN transceiver. ? Although unshielded cable is used in many applications, data transmission circuits employing CAN transceivers are used in applications requiring a rugged interconnection with a wide common-mode voltage range.