| The statistic shows that the Collision is of the majority in freeway in all traffic accidents. At present, some achieved researches were not perfect. Therefore, it becomes an urgent necessity to develop a high-performanced automobile's safely braking system for reducing or avoiding the traffic accidents in freeway.Referring to many researched fruits in automobile anti-collision of the world. Aiming at designed projects having disadvantage and they did not discuss how to control implement, the dissertation stressly researched a perfect functional safely braking system and designed signal acquire circuit and driving circuit. The system added a high pressured pipeline at the same time it does not affect former braking function. Even if the system goes wrong, the former brake system can work all right. The dissertation puts forward the system requirements and confirms the designed scheme by analyzing the cause of collision. This dissertation makes the kinematical analysis of the automobile braking process in detail and establishes a factual and applicable mathematic model of steering safe distance based on the automobile's movement status. Finally, the mathematic models are applied for operation in program in order to well and truly control the implements to work. The whole system consists of several sensors, data collection circuit, alarming circuit, display circuit and driving circuit. The high-powered measured and electronically controlled system is established.This dissertation also analyzes and compares the sensors, then completes the hardware system. The system software is programmed with C language and debugs on the hardware. According the driving environment of the automobile, many effective measures for the software and hardware are adopted to enhance the reliability of this system. At last, experiments are carried out on the system and it is confirmed that the system meets the designed requirements.
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