The Research Of Car Initiative Controlling Speed For Safety Braking

Faced with an increasingly severe traffic safety situation, the collision occurred for the traditional passive protection technology and measures have been unable to meet modern traffic requirements, The development of prevention as the core of the modern automotive active safety technology to become the urgent needs of modern traffic. Huge annual losses caused by traffic accidents, in which pilot error caused the accident by the more than 90%, safe driver assistance technology development a key part of the solution. Compared to foreign R & D, supporting our safe driving skills in the research started late, the outcome of immature technology, vehicles can not reach and resolve all the practical problems encountered. National studies are mainly on a smooth road to travel with two vehicles when overtaking or prevent rear-end level, ignoring the complexity of running the actual road conditions. Once the single car at high speed in bends or descent cases, the existing driving support system had collapsed. Therefore, the study bends and downhill section of the auxiliary driving motor cars and help fill the current intelligence gaps on the road impact, can effectively improve the vehicle's active safety, has important practical significanceThis article summarizes the support system of internal and external security situation, a new design of driver assistance systems - vehicle active speed control system. On that basis, to ensure vehicle in bends, and downhill braking safety, the main road and vehicle factors considered, two kinds of road conditions on the risk of possible conditions, such as yaw, roll, braking distance is too long, etc. in-depth analysis to determine the safety of vehicles traveling on the main parameters: the longitudinal speed, lateral offset and wheel around the vertical force, establishing a safe speed under the two kinds of road conditions the mathematical model. The same time, theoretical analysis and simulation test combined with multi-body dynamic simulation software ADAMS for the platform, a vehicle model and road model cars - Road coupled model, simulation test model, through the establishment of simulation scenarios, simulation of the design, the driver the choice of control strategy to achieve the simulation conditions. Finally the actual use of Chengdu-Chongqing Expressway road model, were selected bends on the downhill section and different sections of the speed of simulation. In the simulation, the processing, moving through the main parameters affecting the security curve analysis to determine the value of the corresponding roads and the speed limit.Articles vehicles in the corners and descent rate of simulation shows the safety value calculated by the corresponding mathematical model of road safety under the conditions of velocity are compared. After error analysis verified the accuracy of the mathematical model proposed to achieve more than 95%, to improve the car's braking safety is certainly feasible. Note that the model could serve as a vehicle active speed control system and auxiliary driving the speed limit based on the speed of identification when safety standards. Research paper speed control system for automotive research and development initiative has laid a theoretical foundation, has important guiding value.