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(13-04-2016, 11:53 AM)Guest Wrote:

anti collision system for car ppt

collision warning system is a system of automotive safety designed to reduce the severity of a collision. Also known as precrash system, front collision warning, collision or softening system. It uses radar (in any weather), and sometimes a laser and a camera (both types of sensors are ineffective in bad weather), to detect an imminent crash. After the detection is done, these systems provide a warning to the driver when there is an imminent collision or act autonomously without any action of the driver (by braking or steering, or both). Collision avoidance by braking is appropriate at low vehicle speeds (for example below 50 km / h), while preventing the collision with the steering at higher expedient speeds.Cars vehicles with collision avoidance it can also be equipped with an adaptive cruise control and use the same forward looking sensors.

In March 2016, the National Highway Traffic Safety Administration (NHTSA) and the Insurance Institute for Highway Safety announced an agreement under which car manufacturers with a market share inclusive of more than 99% of American cars will include an automatic emergency brake as a standard feature almost all new cars sold in the US NHTSA in 2022 it is projected that the subsequent acceleration of the deployment of automatic emergency braking to prevent a collision of about 28,000 and 12,000 injuries.

This article focuses on resolving serious traffic accident vehicle rear end, the base of laser radar, microwave radar, machine vision, ultrasonic technology sensors, multisensory data fusion (MSIF) was used in the automotive intelligent system to prevent collisions associated with These technical problems have been studied and analyzed, put forward a feasible project of intellectual collision avoidance system. This system makes the car can detect the vehicle in front to form a long distance in bad weather environments, determine whether meet the safety distance requirements, and manage the appropriate actuators, accident avoidance.

Based on the principle of ultrasonic range, this article is a kind of inverse of the collision warning system, AT89C51 single chip is the basis of management. The system automatically starts under the control of the controller when the car is in reverse. The probe is installed in the rear bumper sends ultrasound. When he meets an obstacle generated echo. The controller processes the echo signal to determine the location of obstacles, so that this alarm system when it reaches a predetermined distance. Temperature compensation and the method of least squares, are also used to change the distance in data processing to reduce imprecision. Experiments show that the measured values ​​are accurate within the range of 30 ~ 500 cm. Vehicle reversing radar system of high reliability, simple in peripheral circuit, and to use practically and so on.

To prevent accidents at an intersection, where drivers can not see each other, this document is an effective anti-collision system combining DGPS and gyro to display the current status and the exchange of information with the use of the wireless signal between vehicles. Instead of using a millimeter wave frequency, which is currently used in the ITS for radar use in the 5.8 GHz frequency band is considered. This group is expected to be used in the future for communication between vehicles, and its diffraction characteristics is expected. When transmitting a signal with an output power of 15 dBm [] and the gain of the amplifier 15 [dBm], both the receiver and the transmitter 40 [m] from the intersection, out of sight, the received power was -68 [dBm]. The results showed that the system can be made possible by a compact omni-directional antenna