Pre-collision system based on shape memory alloy active protecting device

Abstract

The invention discloses a pre-collision system based on a shape memory alloy active protecting device. a sensor module acquires the relative distance and relative speed of an object and the image of the object, and transmitting the information to a collision pre-judging unit and a target type analyzing unit. The collision pre-judging unit simultaneously receives vehicle speed information from a vehicle CAN network, calculates the brake distance s and brake time t of the vehicle under maximum brake force according to the information, and then calculates the relative distance L from the vehicleto a front object after time t passes, L and s are compared, and thus, whether unavoidable collision occurs or not is judged. A target type analyzing unit processes and analyzes a target image so as to judge the type of the object. A pre-collision electronic control unit controls current applied to a shape memory alloy wire in the active protecting device on the basis of information of unavoidablecollision and information of the target type, thus, the rigidity and energy absorbing characteristics of the shape memory alloy wire are changed, and damage of collision to passengers in the vehicleand pedestrians is relieved.

Description

technical field [0001] The invention belongs to the technical field of automobile safety, in particular to a pre-collision system based on a shape memory alloy active protection device. Background technique [0002] With the development of the automobile industry, people pay more and more attention to the safety of automobiles. Traditional car safety is divided into active safety and passive safety. Active safety uses various sensors, combined with control units and actuators, to avoid car collisions, and passive safety refers to the protection of occupants after a collision. safety measures such as seat belts and airbags. There is still a research field between active safety and passive safety. This field is automobile pre-collision. The research of automobile pre-collision is the synergy of automobile early warning system, protection system and driver assistance system in the instant process of accident. , so as to minimize the accident loss. [0003] At present, there ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the existing automobile pre-collision system cannot take effective measures to protect the safety of occupants and pedestrians in the vehicle according to different pre-collision target types, and provides a pre-collision system based on a shape memory alloy active protection device. system that can determine if an unavoidable collision has occurred

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