Active-Safety Intelligent System For Cars

Traffic accidents due to collision increases, together with automobile total number growth and speed increase, therefore, traffic accidents draw more and more attention. Although passive safety system can lighten the damage of traffic accidents, it cannot prevent the accidents, so, active safety system will surely develop a new trend.This dissertation is an important part of the program "Active-Safety Intelligent System for Cars (ASISC)" of the contract number 6730, which belongs to Chongqing Municipal Science and Technology Commission. The program attempts to eliminate the limitation of the present safety system for cars. ASISC, based on advanced control theories such as fuzzy control, nerve network, integrates three detection technologies: laser detection, ultrasonic detection and infrared detection. ASISC of a running car can real-timely monitor the surrounding conditions of its front, back, left and right side, and instantly display the distances between the car and the nearby barriers. If the car has gone into certain dangerous places, ASISC will give an alarm by sound and light to the driver, at the same time, ASISC will predict possible accident, control the turning configuration, brake configuration and accelerograph-driving devices, automatically choose the best avoiding measure in time, thus, it can actively prevent potential accidents. The innovation and technical line are listed as follows.1. The front telemeter of millimeter wave radar or laser radar costs much money, and is very complicated in the technology, therefore it cannot be mounted on the ordinary cars. By contrast, we develop a front laser telemeter of exclusive use, which makes the structure of the system more simple and reduces the cost, and it will not change the precision. What's more, ASISC integrates three detection technologies: laser detection, ultrasonic detection and infrared detection, and emploies the integrated information processing technology, which makes a running car can real-timely monitor the surrounding conditions of its front, back, left and right side, and instantly display the distances.2. The present safety system only uses single ECU, but our system makes use of the system mode of distributed ECU. The accessory ECUs monitor the surroundings and process the real-time information, at the same time, the principal ECU performs the control and the determination, and displays some datum and gives an alarm needed.3. Aiming at the limitation of the single control, we adopt the fuzzy nerve-network control, and obtain optimized control orders, in other words, the optimized emergency measure. The combination of the skill dealing with fuzzy language information and the learning ability of the nerve-network shows good control performance.4. The traditional safety system cannot satisfy the match of the specific safety system and the engine, as a result, it makes the engine lack of good economic index nor good power index, nor optimized brake performance. But in our system, the active-safety intelligent system and the device controlling the engine cooperate with each other and show the optimized match control.Experiment emulation and prototype test show that ASISC can improve the safety of running cars, satisfy the requirements of brake performance, comfort and instant reaction, enhance the economic index and power index of the engine.